author | serb |
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/* |
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* Copyright (c) 1995, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.awt; |
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import java.awt.peer.ScrollbarPeer; |
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import java.awt.event.*; |
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import java.util.EventListener; |
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import java.io.ObjectOutputStream; |
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import java.io.ObjectInputStream; |
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import java.io.IOException; |
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import javax.accessibility.*; |
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/** |
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* The {@code Scrollbar} class embodies a scroll bar, a |
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* familiar user-interface object. A scroll bar provides a |
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* convenient means for allowing a user to select from a |
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* range of values. The following three vertical |
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* scroll bars could be used as slider controls to pick |
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* the red, green, and blue components of a color: |
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* <p> |
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* <img src="doc-files/Scrollbar-1.gif" alt="Image shows 3 vertical sliders, |
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* side-by-side." style="margin: 7px 10px;"> |
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* <p> |
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* Each scroll bar in this example could be created with |
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* code similar to the following: |
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* |
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* <hr><blockquote><pre> |
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* redSlider=new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 255); |
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* add(redSlider); |
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* </pre></blockquote><hr> |
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* <p> |
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* Alternatively, a scroll bar can represent a range of values. For |
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* example, if a scroll bar is used for scrolling through text, the |
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* width of the "bubble" (also called the "thumb" or "scroll box") |
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* can be used to represent the amount of text that is visible. |
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* Here is an example of a scroll bar that represents a range: |
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* <p> |
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* <img src="doc-files/Scrollbar-2.gif" |
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* alt="Image shows horizontal slider with starting range of 0 and ending range |
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* of 300. The slider thumb is labeled 60." style="margin: 7px 10px;"> |
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* <p> |
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* The value range represented by the bubble in this example |
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* is the <em>visible amount</em>. The horizontal scroll bar |
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* in this example could be created with code like the following: |
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* |
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* <hr><blockquote><pre> |
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* ranger = new Scrollbar(Scrollbar.HORIZONTAL, 0, 60, 0, 300); |
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* add(ranger); |
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* </pre></blockquote><hr> |
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* <p> |
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* Note that the actual maximum value of the scroll bar is the |
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* {@code maximum} minus the {@code visible amount}. |
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* In the previous example, because the {@code maximum} is |
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* 300 and the {@code visible amount} is 60, the actual maximum |
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* value is 240. The range of the scrollbar track is 0 - 300. |
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* The left side of the bubble indicates the value of the |
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* scroll bar. |
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* <p> |
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* Normally, the user changes the value of the scroll bar by |
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* making a gesture with the mouse. For example, the user can |
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* drag the scroll bar's bubble up and down, or click in the |
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* scroll bar's unit increment or block increment areas. Keyboard |
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* gestures can also be mapped to the scroll bar. By convention, |
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* the <b>Page Up</b> and <b>Page Down</b> |
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* keys are equivalent to clicking in the scroll bar's block |
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* increment and block decrement areas. |
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* <p> |
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* When the user changes the value of the scroll bar, the scroll bar |
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* receives an instance of {@code AdjustmentEvent}. |
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* The scroll bar processes this event, passing it along to |
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* any registered listeners. |
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* <p> |
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* Any object that wishes to be notified of changes to the |
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* scroll bar's value should implement |
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* {@code AdjustmentListener}, an interface defined in |
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* the package {@code java.awt.event}. |
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* Listeners can be added and removed dynamically by calling |
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* the methods {@code addAdjustmentListener} and |
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* {@code removeAdjustmentListener}. |
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* <p> |
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* The {@code AdjustmentEvent} class defines five types |
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* of adjustment event, listed here: |
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* |
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* <ul> |
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* <li>{@code AdjustmentEvent.TRACK} is sent out when the |
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* user drags the scroll bar's bubble. |
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* <li>{@code AdjustmentEvent.UNIT_INCREMENT} is sent out |
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* when the user clicks in the left arrow of a horizontal scroll |
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* bar, or the top arrow of a vertical scroll bar, or makes the |
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* equivalent gesture from the keyboard. |
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* <li>{@code AdjustmentEvent.UNIT_DECREMENT} is sent out |
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* when the user clicks in the right arrow of a horizontal scroll |
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* bar, or the bottom arrow of a vertical scroll bar, or makes the |
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* equivalent gesture from the keyboard. |
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* <li>{@code AdjustmentEvent.BLOCK_INCREMENT} is sent out |
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* when the user clicks in the track, to the left of the bubble |
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* on a horizontal scroll bar, or above the bubble on a vertical |
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* scroll bar. By convention, the <b>Page Up</b> |
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* key is equivalent, if the user is using a keyboard that |
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* defines a <b>Page Up</b> key. |
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* <li>{@code AdjustmentEvent.BLOCK_DECREMENT} is sent out |
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* when the user clicks in the track, to the right of the bubble |
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* on a horizontal scroll bar, or below the bubble on a vertical |
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* scroll bar. By convention, the <b>Page Down</b> |
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* key is equivalent, if the user is using a keyboard that |
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* defines a <b>Page Down</b> key. |
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* </ul> |
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* <p> |
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* The JDK 1.0 event system is supported for backwards |
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* compatibility, but its use with newer versions of the platform is |
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* discouraged. The five types of adjustment events introduced |
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* with JDK 1.1 correspond to the five event types |
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* that are associated with scroll bars in previous platform versions. |
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* The following list gives the adjustment event type, |
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* and the corresponding JDK 1.0 event type it replaces. |
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* |
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* <ul> |
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* <li>{@code AdjustmentEvent.TRACK} replaces |
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* {@code Event.SCROLL_ABSOLUTE} |
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* <li>{@code AdjustmentEvent.UNIT_INCREMENT} replaces |
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* {@code Event.SCROLL_LINE_UP} |
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* <li>{@code AdjustmentEvent.UNIT_DECREMENT} replaces |
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* {@code Event.SCROLL_LINE_DOWN} |
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* <li>{@code AdjustmentEvent.BLOCK_INCREMENT} replaces |
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* {@code Event.SCROLL_PAGE_UP} |
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* <li>{@code AdjustmentEvent.BLOCK_DECREMENT} replaces |
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* {@code Event.SCROLL_PAGE_DOWN} |
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* </ul> |
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* <p> |
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* <b>Note</b>: We recommend using a {@code Scrollbar} |
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* for value selection only. If you want to implement |
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* a scrollable component inside a container, we recommend you use |
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* a {@link ScrollPane ScrollPane}. If you use a |
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* {@code Scrollbar} for this purpose, you are likely to |
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* encounter issues with painting, key handling, sizing and |
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* positioning. |
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* |
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* @author Sami Shaio |
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* @see java.awt.event.AdjustmentEvent |
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* @see java.awt.event.AdjustmentListener |
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* @since 1.0 |
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*/ |
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public class Scrollbar extends Component implements Adjustable, Accessible { |
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/** |
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* A constant that indicates a horizontal scroll bar. |
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*/ |
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public static final int HORIZONTAL = 0; |
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/** |
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* A constant that indicates a vertical scroll bar. |
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*/ |
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public static final int VERTICAL = 1; |
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/** |
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* The value of the {@code Scrollbar}. |
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* This property must be greater than or equal to {@code minimum} |
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* and less than or equal to |
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* {@code maximum - visibleAmount} |
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* |
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* @serial |
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* @see #getValue |
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* @see #setValue |
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*/ |
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int value; |
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/** |
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* The maximum value of the {@code Scrollbar}. |
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* This value must be greater than the {@code minimum} |
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* value.<br> |
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* |
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* @serial |
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* @see #getMaximum |
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* @see #setMaximum |
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*/ |
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int maximum; |
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/** |
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* The minimum value of the {@code Scrollbar}. |
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* This value must be less than the {@code maximum} |
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* value.<br> |
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* |
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* @serial |
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* @see #getMinimum |
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* @see #setMinimum |
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*/ |
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int minimum; |
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/** |
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* The size of the {@code Scrollbar}'s bubble. |
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* When a scroll bar is used to select a range of values, |
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* the visibleAmount represents the size of this range. |
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* Depending on platform, this may be visually indicated |
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* by the size of the bubble. |
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* |
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* @serial |
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* @see #getVisibleAmount |
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* @see #setVisibleAmount |
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*/ |
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int visibleAmount; |
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/** |
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* The {@code Scrollbar}'s orientation--being either horizontal |
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* or vertical. |
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* This value should be specified when the scrollbar is created.<BR> |
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* orientation can be either : {@code VERTICAL} or |
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* {@code HORIZONTAL} only. |
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* |
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* @serial |
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* @see #getOrientation |
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* @see #setOrientation |
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*/ |
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int orientation; |
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/** |
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* The amount by which the scrollbar value will change when going |
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* up or down by a line. |
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* This value must be greater than zero. |
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* |
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* @serial |
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* @see #getLineIncrement |
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* @see #setLineIncrement |
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*/ |
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int lineIncrement = 1; |
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/** |
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* The amount by which the scrollbar value will change when going |
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* up or down by a page. |
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* This value must be greater than zero. |
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* |
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* @serial |
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* @see #getPageIncrement |
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* @see #setPageIncrement |
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*/ |
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int pageIncrement = 10; |
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/** |
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* The adjusting status of the {@code Scrollbar}. |
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* True if the value is in the process of changing as a result of |
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* actions being taken by the user. |
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* |
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* @see #getValueIsAdjusting |
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* @see #setValueIsAdjusting |
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* @since 1.4 |
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*/ |
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transient boolean isAdjusting; |
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transient AdjustmentListener adjustmentListener; |
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private static final String base = "scrollbar"; |
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private static int nameCounter = 0; |
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/* |
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* JDK 1.1 serialVersionUID |
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*/ |
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private static final long serialVersionUID = 8451667562882310543L; |
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/** |
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* Initialize JNI field and method IDs. |
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*/ |
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private static native void initIDs(); |
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static { |
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/* ensure that the necessary native libraries are loaded */ |
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Toolkit.loadLibraries(); |
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if (!GraphicsEnvironment.isHeadless()) { |
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initIDs(); |
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} |
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} |
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/** |
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* Constructs a new vertical scroll bar. |
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* The default properties of the scroll bar are listed in |
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* the following table: |
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* |
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* <table class="striped"> |
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* <caption>Scrollbar default properties</caption> |
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* <thead> |
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* <tr> |
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* <th scope="col">Property |
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* <th scope="col">Description |
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* <th scope="col">Default Value |
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* </thead> |
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* <tbody> |
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* <tr> |
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* <th scope="row">orientation |
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* <td>indicates whether the scroll bar is vertical or horizontal |
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* <td>{@code Scrollbar.VERTICAL} |
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* <tr> |
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* <th scope="row">value |
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* <td>value which controls the location of the scroll bar's bubble |
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* <td>0 |
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* <tr> |
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* <th scope="row">visible amount |
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* <td>visible amount of the scroll bar's range, typically represented |
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* by the size of the scroll bar's bubble |
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* <td>10 |
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* <tr> |
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* <th scope="row">minimum |
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* <td>minimum value of the scroll bar |
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* <td>0 |
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* <tr> |
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* <th scope="row">maximum |
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* <td>maximum value of the scroll bar |
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* <td>100 |
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* <tr> |
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* <th scope="row">unit increment |
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* <td>amount the value changes when the Line Up or Line Down key is |
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* pressed, or when the end arrows of the scrollbar are clicked |
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* <td>1 |
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* <tr> |
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* <th scope="row">block increment |
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|
336 |
* <td>amount the value changes when the Page Up or Page Down key is |
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|
337 |
* pressed, or when the scrollbar track is clicked<br>on either side of |
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|
338 |
* the bubble |
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|
339 |
* <td>10 |
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|
340 |
* </tbody> |
2 | 341 |
* </table> |
342 |
* |
|
343 |
* @exception HeadlessException if GraphicsEnvironment.isHeadless() |
|
344 |
* returns true. |
|
345 |
* @see java.awt.GraphicsEnvironment#isHeadless |
|
346 |
*/ |
|
347 |
public Scrollbar() throws HeadlessException { |
|
348 |
this(VERTICAL, 0, 10, 0, 100); |
|
349 |
} |
|
350 |
||
351 |
/** |
|
352 |
* Constructs a new scroll bar with the specified orientation. |
|
353 |
* <p> |
|
35667 | 354 |
* The {@code orientation} argument must take one of the two |
355 |
* values {@code Scrollbar.HORIZONTAL}, |
|
356 |
* or {@code Scrollbar.VERTICAL}, |
|
2 | 357 |
* indicating a horizontal or vertical scroll bar, respectively. |
358 |
* |
|
359 |
* @param orientation indicates the orientation of the scroll bar |
|
360 |
* @exception IllegalArgumentException when an illegal value for |
|
35667 | 361 |
* the {@code orientation} argument is supplied |
2 | 362 |
* @exception HeadlessException if GraphicsEnvironment.isHeadless() |
363 |
* returns true. |
|
364 |
* @see java.awt.GraphicsEnvironment#isHeadless |
|
365 |
*/ |
|
366 |
public Scrollbar(int orientation) throws HeadlessException { |
|
367 |
this(orientation, 0, 10, 0, 100); |
|
368 |
} |
|
369 |
||
370 |
/** |
|
371 |
* Constructs a new scroll bar with the specified orientation, |
|
372 |
* initial value, visible amount, and minimum and maximum values. |
|
373 |
* <p> |
|
35667 | 374 |
* The {@code orientation} argument must take one of the two |
375 |
* values {@code Scrollbar.HORIZONTAL}, |
|
376 |
* or {@code Scrollbar.VERTICAL}, |
|
2 | 377 |
* indicating a horizontal or vertical scroll bar, respectively. |
378 |
* <p> |
|
379 |
* The parameters supplied to this constructor are subject to the |
|
380 |
* constraints described in {@link #setValues(int, int, int, int)}. |
|
381 |
* |
|
382 |
* @param orientation indicates the orientation of the scroll bar. |
|
383 |
* @param value the initial value of the scroll bar |
|
384 |
* @param visible the visible amount of the scroll bar, typically |
|
385 |
* represented by the size of the bubble |
|
386 |
* @param minimum the minimum value of the scroll bar |
|
387 |
* @param maximum the maximum value of the scroll bar |
|
388 |
* @exception IllegalArgumentException when an illegal value for |
|
35667 | 389 |
* the {@code orientation} argument is supplied |
2 | 390 |
* @exception HeadlessException if GraphicsEnvironment.isHeadless() |
391 |
* returns true. |
|
392 |
* @see #setValues |
|
393 |
* @see java.awt.GraphicsEnvironment#isHeadless |
|
394 |
*/ |
|
395 |
public Scrollbar(int orientation, int value, int visible, int minimum, |
|
396 |
int maximum) throws HeadlessException { |
|
397 |
GraphicsEnvironment.checkHeadless(); |
|
398 |
switch (orientation) { |
|
399 |
case HORIZONTAL: |
|
400 |
case VERTICAL: |
|
401 |
this.orientation = orientation; |
|
402 |
break; |
|
403 |
default: |
|
404 |
throw new IllegalArgumentException("illegal scrollbar orientation"); |
|
405 |
} |
|
406 |
setValues(value, visible, minimum, maximum); |
|
407 |
} |
|
408 |
||
409 |
/** |
|
35667 | 410 |
* Constructs a name for this component. Called by {@code getName} |
411 |
* when the name is {@code null}. |
|
2 | 412 |
*/ |
413 |
String constructComponentName() { |
|
414 |
synchronized (Scrollbar.class) { |
|
415 |
return base + nameCounter++; |
|
416 |
} |
|
417 |
} |
|
418 |
||
419 |
/** |
|
35667 | 420 |
* Creates the {@code Scrollbar}'s peer. The peer allows you to modify |
421 |
* the appearance of the {@code Scrollbar} without changing any of its |
|
2 | 422 |
* functionality. |
423 |
*/ |
|
424 |
public void addNotify() { |
|
425 |
synchronized (getTreeLock()) { |
|
426 |
if (peer == null) |
|
30471
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|
427 |
peer = getComponentFactory().createScrollbar(this); |
2 | 428 |
super.addNotify(); |
429 |
} |
|
430 |
} |
|
431 |
||
432 |
/** |
|
433 |
* Returns the orientation of this scroll bar. |
|
434 |
* |
|
435 |
* @return the orientation of this scroll bar, either |
|
35667 | 436 |
* {@code Scrollbar.HORIZONTAL} or |
437 |
* {@code Scrollbar.VERTICAL} |
|
2 | 438 |
* @see java.awt.Scrollbar#setOrientation |
439 |
*/ |
|
440 |
public int getOrientation() { |
|
441 |
return orientation; |
|
442 |
} |
|
443 |
||
444 |
/** |
|
445 |
* Sets the orientation for this scroll bar. |
|
446 |
* |
|
447 |
* @param orientation the orientation of this scroll bar, either |
|
35667 | 448 |
* {@code Scrollbar.HORIZONTAL} or |
449 |
* {@code Scrollbar.VERTICAL} |
|
2 | 450 |
* @see java.awt.Scrollbar#getOrientation |
451 |
* @exception IllegalArgumentException if the value supplied |
|
35667 | 452 |
* for {@code orientation} is not a |
2 | 453 |
* legal value |
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8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
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parents:
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diff
changeset
|
454 |
* @since 1.1 |
2 | 455 |
*/ |
456 |
public void setOrientation(int orientation) { |
|
457 |
synchronized (getTreeLock()) { |
|
458 |
if (orientation == this.orientation) { |
|
459 |
return; |
|
460 |
} |
|
461 |
switch (orientation) { |
|
462 |
case HORIZONTAL: |
|
463 |
case VERTICAL: |
|
464 |
this.orientation = orientation; |
|
465 |
break; |
|
466 |
default: |
|
467 |
throw new IllegalArgumentException("illegal scrollbar orientation"); |
|
468 |
} |
|
469 |
/* Create a new peer with the specified orientation. */ |
|
470 |
if (peer != null) { |
|
471 |
removeNotify(); |
|
472 |
addNotify(); |
|
473 |
invalidate(); |
|
474 |
} |
|
475 |
} |
|
476 |
if (accessibleContext != null) { |
|
477 |
accessibleContext.firePropertyChange( |
|
478 |
AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
|
479 |
((orientation == VERTICAL) |
|
480 |
? AccessibleState.HORIZONTAL : AccessibleState.VERTICAL), |
|
481 |
((orientation == VERTICAL) |
|
482 |
? AccessibleState.VERTICAL : AccessibleState.HORIZONTAL)); |
|
483 |
} |
|
484 |
} |
|
485 |
||
486 |
/** |
|
487 |
* Gets the current value of this scroll bar. |
|
488 |
* |
|
489 |
* @return the current value of this scroll bar |
|
490 |
* @see java.awt.Scrollbar#getMinimum |
|
491 |
* @see java.awt.Scrollbar#getMaximum |
|
492 |
*/ |
|
493 |
public int getValue() { |
|
494 |
return value; |
|
495 |
} |
|
496 |
||
497 |
/** |
|
498 |
* Sets the value of this scroll bar to the specified value. |
|
499 |
* <p> |
|
35667 | 500 |
* If the value supplied is less than the current {@code minimum} |
501 |
* or greater than the current {@code maximum - visibleAmount}, |
|
502 |
* then either {@code minimum} or {@code maximum - visibleAmount} |
|
2 | 503 |
* is substituted, as appropriate. |
504 |
* <p> |
|
505 |
* Normally, a program should change a scroll bar's |
|
35667 | 506 |
* value only by calling {@code setValues}. |
507 |
* The {@code setValues} method simultaneously |
|
2 | 508 |
* and synchronously sets the minimum, maximum, visible amount, |
509 |
* and value properties of a scroll bar, so that they are |
|
510 |
* mutually consistent. |
|
511 |
* <p> |
|
512 |
* Calling this method does not fire an |
|
35667 | 513 |
* {@code AdjustmentEvent}. |
2 | 514 |
* |
515 |
* @param newValue the new value of the scroll bar |
|
516 |
* @see java.awt.Scrollbar#setValues |
|
517 |
* @see java.awt.Scrollbar#getValue |
|
518 |
* @see java.awt.Scrollbar#getMinimum |
|
519 |
* @see java.awt.Scrollbar#getMaximum |
|
520 |
*/ |
|
521 |
public void setValue(int newValue) { |
|
522 |
// Use setValues so that a consistent policy relating |
|
523 |
// minimum, maximum, visible amount, and value is enforced. |
|
524 |
setValues(newValue, visibleAmount, minimum, maximum); |
|
525 |
} |
|
526 |
||
527 |
/** |
|
528 |
* Gets the minimum value of this scroll bar. |
|
529 |
* |
|
530 |
* @return the minimum value of this scroll bar |
|
531 |
* @see java.awt.Scrollbar#getValue |
|
532 |
* @see java.awt.Scrollbar#getMaximum |
|
533 |
*/ |
|
534 |
public int getMinimum() { |
|
535 |
return minimum; |
|
536 |
} |
|
537 |
||
538 |
/** |
|
539 |
* Sets the minimum value of this scroll bar. |
|
540 |
* <p> |
|
35667 | 541 |
* When {@code setMinimum} is called, the minimum value |
2 | 542 |
* is changed, and other values (including the maximum, the |
543 |
* visible amount, and the current scroll bar value) |
|
544 |
* are changed to be consistent with the new minimum. |
|
545 |
* <p> |
|
546 |
* Normally, a program should change a scroll bar's minimum |
|
35667 | 547 |
* value only by calling {@code setValues}. |
548 |
* The {@code setValues} method simultaneously |
|
2 | 549 |
* and synchronously sets the minimum, maximum, visible amount, |
550 |
* and value properties of a scroll bar, so that they are |
|
551 |
* mutually consistent. |
|
552 |
* <p> |
|
35667 | 553 |
* Note that setting the minimum value to {@code Integer.MAX_VALUE} |
2 | 554 |
* will result in the new minimum value being set to |
35667 | 555 |
* {@code Integer.MAX_VALUE - 1}. |
2 | 556 |
* |
557 |
* @param newMinimum the new minimum value for this scroll bar |
|
558 |
* @see java.awt.Scrollbar#setValues |
|
559 |
* @see java.awt.Scrollbar#setMaximum |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
560 |
* @since 1.1 |
2 | 561 |
*/ |
562 |
public void setMinimum(int newMinimum) { |
|
563 |
// No checks are necessary in this method since minimum is |
|
564 |
// the first variable checked in the setValues function. |
|
565 |
||
566 |
// Use setValues so that a consistent policy relating |
|
567 |
// minimum, maximum, visible amount, and value is enforced. |
|
568 |
setValues(value, visibleAmount, newMinimum, maximum); |
|
569 |
} |
|
570 |
||
571 |
/** |
|
572 |
* Gets the maximum value of this scroll bar. |
|
573 |
* |
|
574 |
* @return the maximum value of this scroll bar |
|
575 |
* @see java.awt.Scrollbar#getValue |
|
576 |
* @see java.awt.Scrollbar#getMinimum |
|
577 |
*/ |
|
578 |
public int getMaximum() { |
|
579 |
return maximum; |
|
580 |
} |
|
581 |
||
582 |
/** |
|
583 |
* Sets the maximum value of this scroll bar. |
|
584 |
* <p> |
|
35667 | 585 |
* When {@code setMaximum} is called, the maximum value |
2 | 586 |
* is changed, and other values (including the minimum, the |
587 |
* visible amount, and the current scroll bar value) |
|
588 |
* are changed to be consistent with the new maximum. |
|
589 |
* <p> |
|
590 |
* Normally, a program should change a scroll bar's maximum |
|
35667 | 591 |
* value only by calling {@code setValues}. |
592 |
* The {@code setValues} method simultaneously |
|
2 | 593 |
* and synchronously sets the minimum, maximum, visible amount, |
594 |
* and value properties of a scroll bar, so that they are |
|
595 |
* mutually consistent. |
|
596 |
* <p> |
|
35667 | 597 |
* Note that setting the maximum value to {@code Integer.MIN_VALUE} |
2 | 598 |
* will result in the new maximum value being set to |
35667 | 599 |
* {@code Integer.MIN_VALUE + 1}. |
2 | 600 |
* |
601 |
* @param newMaximum the new maximum value |
|
602 |
* for this scroll bar |
|
603 |
* @see java.awt.Scrollbar#setValues |
|
604 |
* @see java.awt.Scrollbar#setMinimum |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
605 |
* @since 1.1 |
2 | 606 |
*/ |
607 |
public void setMaximum(int newMaximum) { |
|
608 |
// minimum is checked first in setValues, so we need to |
|
609 |
// enforce minimum and maximum checks here. |
|
610 |
if (newMaximum == Integer.MIN_VALUE) { |
|
611 |
newMaximum = Integer.MIN_VALUE + 1; |
|
612 |
} |
|
613 |
||
614 |
if (minimum >= newMaximum) { |
|
615 |
minimum = newMaximum - 1; |
|
616 |
} |
|
617 |
||
618 |
// Use setValues so that a consistent policy relating |
|
619 |
// minimum, maximum, visible amount, and value is enforced. |
|
620 |
setValues(value, visibleAmount, minimum, newMaximum); |
|
621 |
} |
|
622 |
||
623 |
/** |
|
624 |
* Gets the visible amount of this scroll bar. |
|
625 |
* <p> |
|
626 |
* When a scroll bar is used to select a range of values, |
|
627 |
* the visible amount is used to represent the range of values |
|
628 |
* that are currently visible. The size of the scroll bar's |
|
629 |
* bubble (also called a thumb or scroll box), usually gives a |
|
630 |
* visual representation of the relationship of the visible |
|
631 |
* amount to the range of the scroll bar. |
|
7000
5ddef688a02d
6659228: GridBagConstraints API typo - 'ComponentOrienation' (missing t)
dav
parents:
5506
diff
changeset
|
632 |
* Note that depending on platform, the value of the visible amount property |
5ddef688a02d
6659228: GridBagConstraints API typo - 'ComponentOrienation' (missing t)
dav
parents:
5506
diff
changeset
|
633 |
* may not be visually indicated by the size of the bubble. |
2 | 634 |
* <p> |
635 |
* The scroll bar's bubble may not be displayed when it is not |
|
636 |
* moveable (e.g. when it takes up the entire length of the |
|
637 |
* scroll bar's track, or when the scroll bar is disabled). |
|
638 |
* Whether the bubble is displayed or not will not affect |
|
35667 | 639 |
* the value returned by {@code getVisibleAmount}. |
2 | 640 |
* |
641 |
* @return the visible amount of this scroll bar |
|
642 |
* @see java.awt.Scrollbar#setVisibleAmount |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
643 |
* @since 1.1 |
2 | 644 |
*/ |
645 |
public int getVisibleAmount() { |
|
646 |
return getVisible(); |
|
647 |
} |
|
648 |
||
649 |
/** |
|
25162 | 650 |
* Returns the visible amount of this scroll bar. |
651 |
* |
|
652 |
* @return the visible amount of this scroll bar |
|
2 | 653 |
* @deprecated As of JDK version 1.1, |
35667 | 654 |
* replaced by {@code getVisibleAmount()}. |
2 | 655 |
*/ |
656 |
@Deprecated |
|
657 |
public int getVisible() { |
|
658 |
return visibleAmount; |
|
659 |
} |
|
660 |
||
661 |
/** |
|
662 |
* Sets the visible amount of this scroll bar. |
|
663 |
* <p> |
|
664 |
* When a scroll bar is used to select a range of values, |
|
665 |
* the visible amount is used to represent the range of values |
|
666 |
* that are currently visible. The size of the scroll bar's |
|
667 |
* bubble (also called a thumb or scroll box), usually gives a |
|
668 |
* visual representation of the relationship of the visible |
|
669 |
* amount to the range of the scroll bar. |
|
7000
5ddef688a02d
6659228: GridBagConstraints API typo - 'ComponentOrienation' (missing t)
dav
parents:
5506
diff
changeset
|
670 |
* Note that depending on platform, the value of the visible amount property |
5ddef688a02d
6659228: GridBagConstraints API typo - 'ComponentOrienation' (missing t)
dav
parents:
5506
diff
changeset
|
671 |
* may not be visually indicated by the size of the bubble. |
2 | 672 |
* <p> |
673 |
* The scroll bar's bubble may not be displayed when it is not |
|
674 |
* moveable (e.g. when it takes up the entire length of the |
|
675 |
* scroll bar's track, or when the scroll bar is disabled). |
|
676 |
* Whether the bubble is displayed or not will not affect |
|
35667 | 677 |
* the value returned by {@code getVisibleAmount}. |
2 | 678 |
* <p> |
35667 | 679 |
* If the visible amount supplied is less than {@code one} |
680 |
* or greater than the current {@code maximum - minimum}, |
|
681 |
* then either {@code one} or {@code maximum - minimum} |
|
2 | 682 |
* is substituted, as appropriate. |
683 |
* <p> |
|
684 |
* Normally, a program should change a scroll bar's |
|
35667 | 685 |
* value only by calling {@code setValues}. |
686 |
* The {@code setValues} method simultaneously |
|
2 | 687 |
* and synchronously sets the minimum, maximum, visible amount, |
688 |
* and value properties of a scroll bar, so that they are |
|
689 |
* mutually consistent. |
|
690 |
* |
|
691 |
* @param newAmount the new visible amount |
|
692 |
* @see java.awt.Scrollbar#getVisibleAmount |
|
693 |
* @see java.awt.Scrollbar#setValues |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
694 |
* @since 1.1 |
2 | 695 |
*/ |
696 |
public void setVisibleAmount(int newAmount) { |
|
697 |
// Use setValues so that a consistent policy relating |
|
698 |
// minimum, maximum, visible amount, and value is enforced. |
|
699 |
setValues(value, newAmount, minimum, maximum); |
|
700 |
} |
|
701 |
||
702 |
/** |
|
703 |
* Sets the unit increment for this scroll bar. |
|
704 |
* <p> |
|
705 |
* The unit increment is the value that is added or subtracted |
|
706 |
* when the user activates the unit increment area of the |
|
707 |
* scroll bar, generally through a mouse or keyboard gesture |
|
708 |
* that the scroll bar receives as an adjustment event. |
|
709 |
* The unit increment must be greater than zero. |
|
26749 | 710 |
* Attempts to set the unit increment to a value lower than 1 |
2 | 711 |
* will result in a value of 1 being set. |
20120
e89bfc3f8d0e
7057770: (spec)Scrollbar spec should specify that unit increment & decrement functionality may not be present
malenkov
parents:
15318
diff
changeset
|
712 |
* <p> |
e89bfc3f8d0e
7057770: (spec)Scrollbar spec should specify that unit increment & decrement functionality may not be present
malenkov
parents:
15318
diff
changeset
|
713 |
* In some operating systems, this property |
e89bfc3f8d0e
7057770: (spec)Scrollbar spec should specify that unit increment & decrement functionality may not be present
malenkov
parents:
15318
diff
changeset
|
714 |
* can be ignored by the underlying controls. |
2 | 715 |
* |
716 |
* @param v the amount by which to increment or decrement |
|
717 |
* the scroll bar's value |
|
718 |
* @see java.awt.Scrollbar#getUnitIncrement |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
719 |
* @since 1.1 |
2 | 720 |
*/ |
721 |
public void setUnitIncrement(int v) { |
|
722 |
setLineIncrement(v); |
|
723 |
} |
|
724 |
||
725 |
/** |
|
25162 | 726 |
* Sets the unit increment for this scroll bar. |
727 |
* |
|
728 |
* @param v the increment value |
|
729 |
* |
|
2 | 730 |
* @deprecated As of JDK version 1.1, |
35667 | 731 |
* replaced by {@code setUnitIncrement(int)}. |
2 | 732 |
*/ |
733 |
@Deprecated |
|
734 |
public synchronized void setLineIncrement(int v) { |
|
735 |
int tmp = (v < 1) ? 1 : v; |
|
736 |
||
737 |
if (lineIncrement == tmp) { |
|
738 |
return; |
|
739 |
} |
|
740 |
lineIncrement = tmp; |
|
741 |
||
742 |
ScrollbarPeer peer = (ScrollbarPeer)this.peer; |
|
743 |
if (peer != null) { |
|
744 |
peer.setLineIncrement(lineIncrement); |
|
745 |
} |
|
746 |
} |
|
747 |
||
748 |
/** |
|
749 |
* Gets the unit increment for this scrollbar. |
|
750 |
* <p> |
|
751 |
* The unit increment is the value that is added or subtracted |
|
752 |
* when the user activates the unit increment area of the |
|
753 |
* scroll bar, generally through a mouse or keyboard gesture |
|
754 |
* that the scroll bar receives as an adjustment event. |
|
755 |
* The unit increment must be greater than zero. |
|
20120
e89bfc3f8d0e
7057770: (spec)Scrollbar spec should specify that unit increment & decrement functionality may not be present
malenkov
parents:
15318
diff
changeset
|
756 |
* <p> |
e89bfc3f8d0e
7057770: (spec)Scrollbar spec should specify that unit increment & decrement functionality may not be present
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parents:
15318
diff
changeset
|
757 |
* In some operating systems, this property |
e89bfc3f8d0e
7057770: (spec)Scrollbar spec should specify that unit increment & decrement functionality may not be present
malenkov
parents:
15318
diff
changeset
|
758 |
* can be ignored by the underlying controls. |
2 | 759 |
* |
760 |
* @return the unit increment of this scroll bar |
|
761 |
* @see java.awt.Scrollbar#setUnitIncrement |
|
24865
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parents:
23010
diff
changeset
|
762 |
* @since 1.1 |
2 | 763 |
*/ |
764 |
public int getUnitIncrement() { |
|
765 |
return getLineIncrement(); |
|
766 |
} |
|
767 |
||
768 |
/** |
|
25162 | 769 |
* Returns the unit increment for this scrollbar. |
770 |
* |
|
771 |
* @return the unit increment for this scrollbar |
|
2 | 772 |
* @deprecated As of JDK version 1.1, |
35667 | 773 |
* replaced by {@code getUnitIncrement()}. |
2 | 774 |
*/ |
775 |
@Deprecated |
|
776 |
public int getLineIncrement() { |
|
777 |
return lineIncrement; |
|
778 |
} |
|
779 |
||
780 |
/** |
|
781 |
* Sets the block increment for this scroll bar. |
|
782 |
* <p> |
|
783 |
* The block increment is the value that is added or subtracted |
|
784 |
* when the user activates the block increment area of the |
|
785 |
* scroll bar, generally through a mouse or keyboard gesture |
|
786 |
* that the scroll bar receives as an adjustment event. |
|
787 |
* The block increment must be greater than zero. |
|
26749 | 788 |
* Attempts to set the block increment to a value lower than 1 |
2 | 789 |
* will result in a value of 1 being set. |
790 |
* |
|
791 |
* @param v the amount by which to increment or decrement |
|
792 |
* the scroll bar's value |
|
793 |
* @see java.awt.Scrollbar#getBlockIncrement |
|
24865
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8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
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parents:
23010
diff
changeset
|
794 |
* @since 1.1 |
2 | 795 |
*/ |
796 |
public void setBlockIncrement(int v) { |
|
797 |
setPageIncrement(v); |
|
798 |
} |
|
799 |
||
800 |
/** |
|
25162 | 801 |
* Sets the block increment for this scroll bar. |
802 |
* |
|
803 |
* @param v the block increment |
|
2 | 804 |
* @deprecated As of JDK version 1.1, |
35667 | 805 |
* replaced by {@code setBlockIncrement()}. |
2 | 806 |
*/ |
807 |
@Deprecated |
|
808 |
public synchronized void setPageIncrement(int v) { |
|
809 |
int tmp = (v < 1) ? 1 : v; |
|
810 |
||
811 |
if (pageIncrement == tmp) { |
|
812 |
return; |
|
813 |
} |
|
814 |
pageIncrement = tmp; |
|
815 |
||
816 |
ScrollbarPeer peer = (ScrollbarPeer)this.peer; |
|
817 |
if (peer != null) { |
|
818 |
peer.setPageIncrement(pageIncrement); |
|
819 |
} |
|
820 |
} |
|
821 |
||
822 |
/** |
|
823 |
* Gets the block increment of this scroll bar. |
|
824 |
* <p> |
|
825 |
* The block increment is the value that is added or subtracted |
|
826 |
* when the user activates the block increment area of the |
|
827 |
* scroll bar, generally through a mouse or keyboard gesture |
|
828 |
* that the scroll bar receives as an adjustment event. |
|
829 |
* The block increment must be greater than zero. |
|
830 |
* |
|
831 |
* @return the block increment of this scroll bar |
|
832 |
* @see java.awt.Scrollbar#setBlockIncrement |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
833 |
* @since 1.1 |
2 | 834 |
*/ |
835 |
public int getBlockIncrement() { |
|
836 |
return getPageIncrement(); |
|
837 |
} |
|
838 |
||
839 |
/** |
|
25162 | 840 |
* Returns the block increment of this scroll bar. |
841 |
* |
|
842 |
* @return the block increment of this scroll bar |
|
843 |
* |
|
2 | 844 |
* @deprecated As of JDK version 1.1, |
35667 | 845 |
* replaced by {@code getBlockIncrement()}. |
2 | 846 |
*/ |
847 |
@Deprecated |
|
848 |
public int getPageIncrement() { |
|
849 |
return pageIncrement; |
|
850 |
} |
|
851 |
||
852 |
/** |
|
853 |
* Sets the values of four properties for this scroll bar: |
|
35667 | 854 |
* {@code value}, {@code visibleAmount}, |
855 |
* {@code minimum}, and {@code maximum}. |
|
2 | 856 |
* If the values supplied for these properties are inconsistent |
857 |
* or incorrect, they will be changed to ensure consistency. |
|
858 |
* <p> |
|
859 |
* This method simultaneously and synchronously sets the values |
|
860 |
* of four scroll bar properties, assuring that the values of |
|
861 |
* these properties are mutually consistent. It enforces the |
|
862 |
* following constraints: |
|
35667 | 863 |
* {@code maximum} must be greater than {@code minimum}, |
864 |
* {@code maximum - minimum} must not be greater |
|
865 |
* than {@code Integer.MAX_VALUE}, |
|
866 |
* {@code visibleAmount} must be greater than zero. |
|
867 |
* {@code visibleAmount} must not be greater than |
|
868 |
* {@code maximum - minimum}, |
|
869 |
* {@code value} must not be less than {@code minimum}, |
|
870 |
* and {@code value} must not be greater than |
|
871 |
* {@code maximum - visibleAmount} |
|
2 | 872 |
* <p> |
873 |
* Calling this method does not fire an |
|
35667 | 874 |
* {@code AdjustmentEvent}. |
2 | 875 |
* |
876 |
* @param value is the position in the current window |
|
877 |
* @param visible is the visible amount of the scroll bar |
|
878 |
* @param minimum is the minimum value of the scroll bar |
|
879 |
* @param maximum is the maximum value of the scroll bar |
|
880 |
* @see #setMinimum |
|
881 |
* @see #setMaximum |
|
882 |
* @see #setVisibleAmount |
|
883 |
* @see #setValue |
|
884 |
*/ |
|
885 |
public void setValues(int value, int visible, int minimum, int maximum) { |
|
886 |
int oldValue; |
|
887 |
synchronized (this) { |
|
888 |
if (minimum == Integer.MAX_VALUE) { |
|
889 |
minimum = Integer.MAX_VALUE - 1; |
|
890 |
} |
|
891 |
if (maximum <= minimum) { |
|
892 |
maximum = minimum + 1; |
|
893 |
} |
|
894 |
||
895 |
long maxMinusMin = (long) maximum - (long) minimum; |
|
896 |
if (maxMinusMin > Integer.MAX_VALUE) { |
|
897 |
maxMinusMin = Integer.MAX_VALUE; |
|
898 |
maximum = minimum + (int) maxMinusMin; |
|
899 |
} |
|
900 |
if (visible > (int) maxMinusMin) { |
|
901 |
visible = (int) maxMinusMin; |
|
902 |
} |
|
903 |
if (visible < 1) { |
|
904 |
visible = 1; |
|
905 |
} |
|
906 |
||
907 |
if (value < minimum) { |
|
908 |
value = minimum; |
|
909 |
} |
|
910 |
if (value > maximum - visible) { |
|
911 |
value = maximum - visible; |
|
912 |
} |
|
913 |
||
914 |
oldValue = this.value; |
|
915 |
this.value = value; |
|
916 |
this.visibleAmount = visible; |
|
917 |
this.minimum = minimum; |
|
918 |
this.maximum = maximum; |
|
919 |
ScrollbarPeer peer = (ScrollbarPeer)this.peer; |
|
920 |
if (peer != null) { |
|
921 |
peer.setValues(value, visibleAmount, minimum, maximum); |
|
922 |
} |
|
923 |
} |
|
924 |
||
925 |
if ((oldValue != value) && (accessibleContext != null)) { |
|
926 |
accessibleContext.firePropertyChange( |
|
927 |
AccessibleContext.ACCESSIBLE_VALUE_PROPERTY, |
|
928 |
Integer.valueOf(oldValue), |
|
929 |
Integer.valueOf(value)); |
|
930 |
} |
|
931 |
} |
|
932 |
||
933 |
/** |
|
934 |
* Returns true if the value is in the process of changing as a |
|
935 |
* result of actions being taken by the user. |
|
936 |
* |
|
35667 | 937 |
* @return the value of the {@code valueIsAdjusting} property |
2 | 938 |
* @see #setValueIsAdjusting |
939 |
* @since 1.4 |
|
940 |
*/ |
|
941 |
public boolean getValueIsAdjusting() { |
|
942 |
return isAdjusting; |
|
943 |
} |
|
944 |
||
945 |
/** |
|
35667 | 946 |
* Sets the {@code valueIsAdjusting} property. |
2 | 947 |
* |
948 |
* @param b new adjustment-in-progress status |
|
949 |
* @see #getValueIsAdjusting |
|
950 |
* @since 1.4 |
|
951 |
*/ |
|
952 |
public void setValueIsAdjusting(boolean b) { |
|
953 |
boolean oldValue; |
|
954 |
||
955 |
synchronized (this) { |
|
956 |
oldValue = isAdjusting; |
|
957 |
isAdjusting = b; |
|
958 |
} |
|
959 |
||
960 |
if ((oldValue != b) && (accessibleContext != null)) { |
|
961 |
accessibleContext.firePropertyChange( |
|
962 |
AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
|
963 |
((oldValue) ? AccessibleState.BUSY : null), |
|
964 |
((b) ? AccessibleState.BUSY : null)); |
|
965 |
} |
|
966 |
} |
|
967 |
||
968 |
||
969 |
||
970 |
/** |
|
971 |
* Adds the specified adjustment listener to receive instances of |
|
35667 | 972 |
* {@code AdjustmentEvent} from this scroll bar. |
973 |
* If l is {@code null}, no exception is thrown and no |
|
2 | 974 |
* action is performed. |
975 |
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" |
|
976 |
* >AWT Threading Issues</a> for details on AWT's threading model. |
|
977 |
* |
|
978 |
* @param l the adjustment listener |
|
979 |
* @see #removeAdjustmentListener |
|
980 |
* @see #getAdjustmentListeners |
|
981 |
* @see java.awt.event.AdjustmentEvent |
|
982 |
* @see java.awt.event.AdjustmentListener |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
983 |
* @since 1.1 |
2 | 984 |
*/ |
985 |
public synchronized void addAdjustmentListener(AdjustmentListener l) { |
|
986 |
if (l == null) { |
|
987 |
return; |
|
988 |
} |
|
989 |
adjustmentListener = AWTEventMulticaster.add(adjustmentListener, l); |
|
990 |
newEventsOnly = true; |
|
991 |
} |
|
992 |
||
993 |
/** |
|
994 |
* Removes the specified adjustment listener so that it no longer |
|
35667 | 995 |
* receives instances of {@code AdjustmentEvent} from this scroll bar. |
996 |
* If l is {@code null}, no exception is thrown and no action |
|
2 | 997 |
* is performed. |
998 |
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" |
|
999 |
* >AWT Threading Issues</a> for details on AWT's threading model. |
|
1000 |
* |
|
1001 |
* @param l the adjustment listener |
|
1002 |
* @see #addAdjustmentListener |
|
1003 |
* @see #getAdjustmentListeners |
|
1004 |
* @see java.awt.event.AdjustmentEvent |
|
1005 |
* @see java.awt.event.AdjustmentListener |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
1006 |
* @since 1.1 |
2 | 1007 |
*/ |
1008 |
public synchronized void removeAdjustmentListener(AdjustmentListener l) { |
|
1009 |
if (l == null) { |
|
1010 |
return; |
|
1011 |
} |
|
1012 |
adjustmentListener = AWTEventMulticaster.remove(adjustmentListener, l); |
|
1013 |
} |
|
1014 |
||
1015 |
/** |
|
1016 |
* Returns an array of all the adjustment listeners |
|
1017 |
* registered on this scrollbar. |
|
1018 |
* |
|
35667 | 1019 |
* @return all of this scrollbar's {@code AdjustmentListener}s |
2 | 1020 |
* or an empty array if no adjustment |
1021 |
* listeners are currently registered |
|
1022 |
* @see #addAdjustmentListener |
|
1023 |
* @see #removeAdjustmentListener |
|
1024 |
* @see java.awt.event.AdjustmentEvent |
|
1025 |
* @see java.awt.event.AdjustmentListener |
|
1026 |
* @since 1.4 |
|
1027 |
*/ |
|
1028 |
public synchronized AdjustmentListener[] getAdjustmentListeners() { |
|
15318
607db339afcc
8005492: Reduce number of warnings in sun/awt/* classes
mcherkas
parents:
7668
diff
changeset
|
1029 |
return getListeners(AdjustmentListener.class); |
2 | 1030 |
} |
1031 |
||
1032 |
/** |
|
1033 |
* Returns an array of all the objects currently registered |
|
1034 |
* as <code><em>Foo</em>Listener</code>s |
|
35667 | 1035 |
* upon this {@code Scrollbar}. |
2 | 1036 |
* <code><em>Foo</em>Listener</code>s are registered using the |
1037 |
* <code>add<em>Foo</em>Listener</code> method. |
|
1038 |
* <p> |
|
35667 | 1039 |
* You can specify the {@code listenerType} argument |
2 | 1040 |
* with a class literal, such as |
1041 |
* <code><em>Foo</em>Listener.class</code>. |
|
1042 |
* For example, you can query a |
|
35667 | 1043 |
* {@code Scrollbar c} |
2 | 1044 |
* for its mouse listeners with the following code: |
1045 |
* |
|
1046 |
* <pre>MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));</pre> |
|
1047 |
* |
|
1048 |
* If no such listeners exist, this method returns an empty array. |
|
1049 |
* |
|
1050 |
* @param listenerType the type of listeners requested; this parameter |
|
1051 |
* should specify an interface that descends from |
|
35667 | 1052 |
* {@code java.util.EventListener} |
2 | 1053 |
* @return an array of all objects registered as |
1054 |
* <code><em>Foo</em>Listener</code>s on this component, |
|
1055 |
* or an empty array if no such listeners have been added |
|
35667 | 1056 |
* @exception ClassCastException if {@code listenerType} |
2 | 1057 |
* doesn't specify a class or interface that implements |
35667 | 1058 |
* {@code java.util.EventListener} |
2 | 1059 |
* |
1060 |
* @since 1.3 |
|
1061 |
*/ |
|
1062 |
public <T extends EventListener> T[] getListeners(Class<T> listenerType) { |
|
1063 |
EventListener l = null; |
|
1064 |
if (listenerType == AdjustmentListener.class) { |
|
1065 |
l = adjustmentListener; |
|
1066 |
} else { |
|
1067 |
return super.getListeners(listenerType); |
|
1068 |
} |
|
1069 |
return AWTEventMulticaster.getListeners(l, listenerType); |
|
1070 |
} |
|
1071 |
||
1072 |
// REMIND: remove when filtering is done at lower level |
|
1073 |
boolean eventEnabled(AWTEvent e) { |
|
1074 |
if (e.id == AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED) { |
|
1075 |
if ((eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0 || |
|
1076 |
adjustmentListener != null) { |
|
1077 |
return true; |
|
1078 |
} |
|
1079 |
return false; |
|
1080 |
} |
|
1081 |
return super.eventEnabled(e); |
|
1082 |
} |
|
1083 |
||
1084 |
/** |
|
1085 |
* Processes events on this scroll bar. If the event is an |
|
35667 | 1086 |
* instance of {@code AdjustmentEvent}, it invokes the |
1087 |
* {@code processAdjustmentEvent} method. |
|
2 | 1088 |
* Otherwise, it invokes its superclass's |
35667 | 1089 |
* {@code processEvent} method. |
1090 |
* <p>Note that if the event parameter is {@code null} |
|
2 | 1091 |
* the behavior is unspecified and may result in an |
1092 |
* exception. |
|
1093 |
* |
|
1094 |
* @param e the event |
|
1095 |
* @see java.awt.event.AdjustmentEvent |
|
1096 |
* @see java.awt.Scrollbar#processAdjustmentEvent |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
1097 |
* @since 1.1 |
2 | 1098 |
*/ |
1099 |
protected void processEvent(AWTEvent e) { |
|
1100 |
if (e instanceof AdjustmentEvent) { |
|
1101 |
processAdjustmentEvent((AdjustmentEvent)e); |
|
1102 |
return; |
|
1103 |
} |
|
1104 |
super.processEvent(e); |
|
1105 |
} |
|
1106 |
||
1107 |
/** |
|
1108 |
* Processes adjustment events occurring on this |
|
1109 |
* scrollbar by dispatching them to any registered |
|
35667 | 1110 |
* {@code AdjustmentListener} objects. |
2 | 1111 |
* <p> |
1112 |
* This method is not called unless adjustment events are |
|
1113 |
* enabled for this component. Adjustment events are enabled |
|
1114 |
* when one of the following occurs: |
|
21957 | 1115 |
* <ul> |
35667 | 1116 |
* <li>An {@code AdjustmentListener} object is registered |
1117 |
* via {@code addAdjustmentListener}. |
|
1118 |
* <li>Adjustment events are enabled via {@code enableEvents}. |
|
21957 | 1119 |
* </ul> |
35667 | 1120 |
* <p>Note that if the event parameter is {@code null} |
2 | 1121 |
* the behavior is unspecified and may result in an |
1122 |
* exception. |
|
1123 |
* |
|
1124 |
* @param e the adjustment event |
|
1125 |
* @see java.awt.event.AdjustmentEvent |
|
1126 |
* @see java.awt.event.AdjustmentListener |
|
1127 |
* @see java.awt.Scrollbar#addAdjustmentListener |
|
1128 |
* @see java.awt.Component#enableEvents |
|
24865
09b1d992ca72
8044740: Convert all JDK versions used in @since tag to 1.n[.n] in jdk repo
henryjen
parents:
23010
diff
changeset
|
1129 |
* @since 1.1 |
2 | 1130 |
*/ |
1131 |
protected void processAdjustmentEvent(AdjustmentEvent e) { |
|
1132 |
AdjustmentListener listener = adjustmentListener; |
|
1133 |
if (listener != null) { |
|
1134 |
listener.adjustmentValueChanged(e); |
|
1135 |
} |
|
1136 |
} |
|
1137 |
||
1138 |
/** |
|
35667 | 1139 |
* Returns a string representing the state of this {@code Scrollbar}. |
2 | 1140 |
* This method is intended to be used only for debugging purposes, and the |
1141 |
* content and format of the returned string may vary between |
|
1142 |
* implementations. The returned string may be empty but may not be |
|
35667 | 1143 |
* {@code null}. |
2 | 1144 |
* |
1145 |
* @return the parameter string of this scroll bar |
|
1146 |
*/ |
|
1147 |
protected String paramString() { |
|
1148 |
return super.paramString() + |
|
1149 |
",val=" + value + |
|
1150 |
",vis=" + visibleAmount + |
|
1151 |
",min=" + minimum + |
|
1152 |
",max=" + maximum + |
|
1153 |
((orientation == VERTICAL) ? ",vert" : ",horz") + |
|
1154 |
",isAdjusting=" + isAdjusting; |
|
1155 |
} |
|
1156 |
||
1157 |
||
1158 |
/* Serialization support. |
|
1159 |
*/ |
|
1160 |
||
1161 |
/** |
|
1162 |
* The scroll bar's serialized Data Version. |
|
1163 |
* |
|
1164 |
* @serial |
|
1165 |
*/ |
|
1166 |
private int scrollbarSerializedDataVersion = 1; |
|
1167 |
||
1168 |
/** |
|
1169 |
* Writes default serializable fields to stream. Writes |
|
35667 | 1170 |
* a list of serializable {@code AdjustmentListeners} |
2 | 1171 |
* as optional data. The non-serializable listeners are |
1172 |
* detected and no attempt is made to serialize them. |
|
1173 |
* |
|
35667 | 1174 |
* @param s the {@code ObjectOutputStream} to write |
1175 |
* @serialData {@code null} terminated sequence of 0 |
|
1176 |
* or more pairs; the pair consists of a {@code String} |
|
1177 |
* and an {@code Object}; the {@code String} indicates |
|
2 | 1178 |
* the type of object and is one of the following: |
35667 | 1179 |
* {@code adjustmentListenerK} indicating an |
1180 |
* {@code AdjustmentListener} object |
|
2 | 1181 |
* |
1182 |
* @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener) |
|
1183 |
* @see java.awt.Component#adjustmentListenerK |
|
1184 |
* @see #readObject(ObjectInputStream) |
|
1185 |
*/ |
|
1186 |
private void writeObject(ObjectOutputStream s) |
|
1187 |
throws IOException |
|
1188 |
{ |
|
1189 |
s.defaultWriteObject(); |
|
1190 |
||
1191 |
AWTEventMulticaster.save(s, adjustmentListenerK, adjustmentListener); |
|
1192 |
s.writeObject(null); |
|
1193 |
} |
|
1194 |
||
1195 |
/** |
|
35667 | 1196 |
* Reads the {@code ObjectInputStream} and if |
1197 |
* it isn't {@code null} adds a listener to |
|
2 | 1198 |
* receive adjustment events fired by the |
35667 | 1199 |
* {@code Scrollbar}. |
2 | 1200 |
* Unrecognized keys or values will be ignored. |
1201 |
* |
|
35667 | 1202 |
* @param s the {@code ObjectInputStream} to read |
2 | 1203 |
* @exception HeadlessException if |
35667 | 1204 |
* {@code GraphicsEnvironment.isHeadless} returns |
1205 |
* {@code true} |
|
2 | 1206 |
* @see java.awt.GraphicsEnvironment#isHeadless |
1207 |
* @see #writeObject(ObjectOutputStream) |
|
1208 |
*/ |
|
1209 |
private void readObject(ObjectInputStream s) |
|
1210 |
throws ClassNotFoundException, IOException, HeadlessException |
|
1211 |
{ |
|
1212 |
GraphicsEnvironment.checkHeadless(); |
|
1213 |
s.defaultReadObject(); |
|
1214 |
||
1215 |
Object keyOrNull; |
|
1216 |
while(null != (keyOrNull = s.readObject())) { |
|
1217 |
String key = ((String)keyOrNull).intern(); |
|
1218 |
||
1219 |
if (adjustmentListenerK == key) |
|
1220 |
addAdjustmentListener((AdjustmentListener)(s.readObject())); |
|
1221 |
||
1222 |
else // skip value for unrecognized key |
|
1223 |
s.readObject(); |
|
1224 |
} |
|
1225 |
} |
|
1226 |
||
1227 |
||
1228 |
///////////////// |
|
1229 |
// Accessibility support |
|
1230 |
//////////////// |
|
1231 |
||
1232 |
/** |
|
35667 | 1233 |
* Gets the {@code AccessibleContext} associated with this |
1234 |
* {@code Scrollbar}. For scrollbars, the |
|
1235 |
* {@code AccessibleContext} takes the form of an |
|
1236 |
* {@code AccessibleAWTScrollBar}. A new |
|
1237 |
* {@code AccessibleAWTScrollBar} instance is created if necessary. |
|
2 | 1238 |
* |
35667 | 1239 |
* @return an {@code AccessibleAWTScrollBar} that serves as the |
1240 |
* {@code AccessibleContext} of this {@code ScrollBar} |
|
2 | 1241 |
* @since 1.3 |
1242 |
*/ |
|
1243 |
public AccessibleContext getAccessibleContext() { |
|
1244 |
if (accessibleContext == null) { |
|
1245 |
accessibleContext = new AccessibleAWTScrollBar(); |
|
1246 |
} |
|
1247 |
return accessibleContext; |
|
1248 |
} |
|
1249 |
||
1250 |
/** |
|
1251 |
* This class implements accessibility support for the |
|
35667 | 1252 |
* {@code Scrollbar} class. It provides an implementation of |
2 | 1253 |
* the Java Accessibility API appropriate to scrollbar |
1254 |
* user-interface elements. |
|
1255 |
* @since 1.3 |
|
1256 |
*/ |
|
1257 |
protected class AccessibleAWTScrollBar extends AccessibleAWTComponent |
|
1258 |
implements AccessibleValue |
|
1259 |
{ |
|
1260 |
/* |
|
1261 |
* JDK 1.3 serialVersionUID |
|
1262 |
*/ |
|
1263 |
private static final long serialVersionUID = -344337268523697807L; |
|
1264 |
||
1265 |
/** |
|
1266 |
* Get the state set of this object. |
|
1267 |
* |
|
35667 | 1268 |
* @return an instance of {@code AccessibleState} |
2 | 1269 |
* containing the current state of the object |
1270 |
* @see AccessibleState |
|
1271 |
*/ |
|
1272 |
public AccessibleStateSet getAccessibleStateSet() { |
|
1273 |
AccessibleStateSet states = super.getAccessibleStateSet(); |
|
1274 |
if (getValueIsAdjusting()) { |
|
1275 |
states.add(AccessibleState.BUSY); |
|
1276 |
} |
|
1277 |
if (getOrientation() == VERTICAL) { |
|
1278 |
states.add(AccessibleState.VERTICAL); |
|
1279 |
} else { |
|
1280 |
states.add(AccessibleState.HORIZONTAL); |
|
1281 |
} |
|
1282 |
return states; |
|
1283 |
} |
|
1284 |
||
1285 |
/** |
|
1286 |
* Get the role of this object. |
|
1287 |
* |
|
35667 | 1288 |
* @return an instance of {@code AccessibleRole} |
2 | 1289 |
* describing the role of the object |
1290 |
*/ |
|
1291 |
public AccessibleRole getAccessibleRole() { |
|
1292 |
return AccessibleRole.SCROLL_BAR; |
|
1293 |
} |
|
1294 |
||
1295 |
/** |
|
35667 | 1296 |
* Get the {@code AccessibleValue} associated with this |
2 | 1297 |
* object. In the implementation of the Java Accessibility |
1298 |
* API for this class, return this object, which is |
|
1299 |
* responsible for implementing the |
|
35667 | 1300 |
* {@code AccessibleValue} interface on behalf of itself. |
2 | 1301 |
* |
1302 |
* @return this object |
|
1303 |
*/ |
|
1304 |
public AccessibleValue getAccessibleValue() { |
|
1305 |
return this; |
|
1306 |
} |
|
1307 |
||
1308 |
/** |
|
1309 |
* Get the accessible value of this object. |
|
1310 |
* |
|
1311 |
* @return The current value of this object. |
|
1312 |
*/ |
|
1313 |
public Number getCurrentAccessibleValue() { |
|
1314 |
return Integer.valueOf(getValue()); |
|
1315 |
} |
|
1316 |
||
1317 |
/** |
|
1318 |
* Set the value of this object as a Number. |
|
1319 |
* |
|
1320 |
* @return True if the value was set. |
|
1321 |
*/ |
|
1322 |
public boolean setCurrentAccessibleValue(Number n) { |
|
1323 |
if (n instanceof Integer) { |
|
1324 |
setValue(n.intValue()); |
|
1325 |
return true; |
|
1326 |
} else { |
|
1327 |
return false; |
|
1328 |
} |
|
1329 |
} |
|
1330 |
||
1331 |
/** |
|
1332 |
* Get the minimum accessible value of this object. |
|
1333 |
* |
|
1334 |
* @return The minimum value of this object. |
|
1335 |
*/ |
|
1336 |
public Number getMinimumAccessibleValue() { |
|
1337 |
return Integer.valueOf(getMinimum()); |
|
1338 |
} |
|
1339 |
||
1340 |
/** |
|
1341 |
* Get the maximum accessible value of this object. |
|
1342 |
* |
|
1343 |
* @return The maximum value of this object. |
|
1344 |
*/ |
|
1345 |
public Number getMaximumAccessibleValue() { |
|
1346 |
return Integer.valueOf(getMaximum()); |
|
1347 |
} |
|
1348 |
||
1349 |
} // AccessibleAWTScrollBar |
|
1350 |
||
1351 |
} |