author | malenkov |
Wed, 30 Apr 2014 19:28:05 +0400 | |
changeset 24544 | c0133e7c7162 |
parent 23010 | 6dadb192ad81 |
child 25201 | 4adc75e0c4e5 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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6dadb192ad81
8029235: Update copyright year to match last edit in jdk8 jdk repository for 2013
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parents:
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changeset
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* Copyright (c) 1997, 2013, 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 javax.swing; |
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import java.awt.*; |
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import java.beans.ConstructorProperties; |
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import java.io.Serializable; |
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import java.io.PrintStream; |
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||
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/** |
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* A layout manager that allows multiple components to be laid out either |
|
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* vertically or horizontally. The components will not wrap so, for |
|
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* example, a vertical arrangement of components will stay vertically |
|
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* arranged when the frame is resized. |
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* <TABLE STYLE="FLOAT:RIGHT" BORDER="0" SUMMARY="layout"> |
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* <TR> |
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* <TD ALIGN="CENTER"> |
|
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* <P STYLE="TEXT-ALIGN:CENTER"><IMG SRC="doc-files/BoxLayout-1.gif" |
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* alt="The following text describes this graphic." |
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* WIDTH="191" HEIGHT="201" STYLE="FLOAT:BOTTOM; BORDER:0"> |
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* </TD> |
46 |
* </TR> |
|
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* </TABLE> |
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* <p> |
|
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* Nesting multiple panels with different combinations of horizontal and |
|
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* vertical gives an effect similar to GridBagLayout, without the |
|
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* complexity. The diagram shows two panels arranged horizontally, each |
|
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* of which contains 3 components arranged vertically. |
|
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* |
|
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* <p> The BoxLayout manager is constructed with an axis parameter that |
|
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* specifies the type of layout that will be done. There are four choices: |
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* |
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* <blockquote><b><tt>X_AXIS</tt></b> - Components are laid out horizontally |
|
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* from left to right.</blockquote> |
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* |
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* <blockquote><b><tt>Y_AXIS</tt></b> - Components are laid out vertically |
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* from top to bottom.</blockquote> |
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* |
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* <blockquote><b><tt>LINE_AXIS</tt></b> - Components are laid out the way |
|
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* words are laid out in a line, based on the container's |
|
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* <tt>ComponentOrientation</tt> property. If the container's |
|
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* <tt>ComponentOrientation</tt> is horizontal then components are laid out |
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* horizontally, otherwise they are laid out vertically. For horizontal |
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* orientations, if the container's <tt>ComponentOrientation</tt> is left to |
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* right then components are laid out left to right, otherwise they are laid |
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* out right to left. For vertical orientations components are always laid out |
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* from top to bottom.</blockquote> |
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* |
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* <blockquote><b><tt>PAGE_AXIS</tt></b> - Components are laid out the way |
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* text lines are laid out on a page, based on the container's |
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* <tt>ComponentOrientation</tt> property. If the container's |
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* <tt>ComponentOrientation</tt> is horizontal then components are laid out |
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* vertically, otherwise they are laid out horizontally. For horizontal |
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* orientations, if the container's <tt>ComponentOrientation</tt> is left to |
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* right then components are laid out left to right, otherwise they are laid |
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* out right to left. For vertical orientations components are always |
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* laid out from top to bottom.</blockquote> |
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* <p> |
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* For all directions, components are arranged in the same order as they were |
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* added to the container. |
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* <p> |
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* BoxLayout attempts to arrange components |
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* at their preferred widths (for horizontal layout) |
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* or heights (for vertical layout). |
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* For a horizontal layout, |
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* if not all the components are the same height, |
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* BoxLayout attempts to make all the components |
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* as high as the highest component. |
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* If that's not possible for a particular component, |
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* then BoxLayout aligns that component vertically, |
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* according to the component's Y alignment. |
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* By default, a component has a Y alignment of 0.5, |
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* which means that the vertical center of the component |
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* should have the same Y coordinate as |
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* the vertical centers of other components with 0.5 Y alignment. |
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* <p> |
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* Similarly, for a vertical layout, |
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* BoxLayout attempts to make all components in the column |
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* as wide as the widest component. |
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* If that fails, it aligns them horizontally |
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* according to their X alignments. For <code>PAGE_AXIS</code> layout, |
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* horizontal alignment is done based on the leading edge of the component. |
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* In other words, an X alignment value of 0.0 means the left edge of a |
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* component if the container's <code>ComponentOrientation</code> is left to |
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* right and it means the right edge of the component otherwise. |
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* <p> |
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* Instead of using BoxLayout directly, many programs use the Box class. |
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* The Box class is a lightweight container that uses a BoxLayout. |
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* It also provides handy methods to help you use BoxLayout well. |
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* Adding components to multiple nested boxes is a powerful way to get |
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* the arrangement you want. |
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* <p> |
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* For further information and examples see |
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* <a |
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href="http://docs.oracle.com/javase/tutorial/uiswing/layout/box.html">How to Use BoxLayout</a>, |
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* a section in <em>The Java Tutorial.</em> |
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* <p> |
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* <strong>Warning:</strong> |
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* Serialized objects of this class will not be compatible with |
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* future Swing releases. The current serialization support is |
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* appropriate for short term storage or RMI between applications running |
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* the same version of Swing. As of 1.4, support for long term storage |
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* of all JavaBeans™ |
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* has been added to the <code>java.beans</code> package. |
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* Please see {@link java.beans.XMLEncoder}. |
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* |
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* @see Box |
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* @see java.awt.ComponentOrientation |
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* @see JComponent#getAlignmentX |
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* @see JComponent#getAlignmentY |
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* |
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* @author Timothy Prinzing |
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*/ |
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@SuppressWarnings("serial") |
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public class BoxLayout implements LayoutManager2, Serializable { |
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/** |
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* Specifies that components should be laid out left to right. |
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*/ |
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public static final int X_AXIS = 0; |
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||
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/** |
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* Specifies that components should be laid out top to bottom. |
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*/ |
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public static final int Y_AXIS = 1; |
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/** |
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* Specifies that components should be laid out in the direction of |
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* a line of text as determined by the target container's |
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* <code>ComponentOrientation</code> property. |
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*/ |
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public static final int LINE_AXIS = 2; |
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/** |
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* Specifies that components should be laid out in the direction that |
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* lines flow across a page as determined by the target container's |
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* <code>ComponentOrientation</code> property. |
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*/ |
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public static final int PAGE_AXIS = 3; |
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/** |
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* Creates a layout manager that will lay out components along the |
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* given axis. |
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* |
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* @param target the container that needs to be laid out |
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* @param axis the axis to lay out components along. Can be one of: |
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* <code>BoxLayout.X_AXIS</code>, |
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* <code>BoxLayout.Y_AXIS</code>, |
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* <code>BoxLayout.LINE_AXIS</code> or |
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* <code>BoxLayout.PAGE_AXIS</code> |
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* |
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* @exception AWTError if the value of <code>axis</code> is invalid |
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*/ |
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@ConstructorProperties({"target", "axis"}) |
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public BoxLayout(Container target, int axis) { |
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if (axis != X_AXIS && axis != Y_AXIS && |
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axis != LINE_AXIS && axis != PAGE_AXIS) { |
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throw new AWTError("Invalid axis"); |
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} |
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this.axis = axis; |
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this.target = target; |
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} |
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/** |
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* Constructs a BoxLayout that |
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* produces debugging messages. |
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* |
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* @param target the container that needs to be laid out |
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* @param axis the axis to lay out components along. Can be one of: |
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* <code>BoxLayout.X_AXIS</code>, |
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* <code>BoxLayout.Y_AXIS</code>, |
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* <code>BoxLayout.LINE_AXIS</code> or |
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* <code>BoxLayout.PAGE_AXIS</code> |
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* |
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* @param dbg the stream to which debugging messages should be sent, |
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* null if none |
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*/ |
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BoxLayout(Container target, int axis, PrintStream dbg) { |
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this(target, axis); |
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this.dbg = dbg; |
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} |
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||
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/** |
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* Returns the container that uses this layout manager. |
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* |
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* @return the container that uses this layout manager |
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* |
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* @since 1.6 |
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*/ |
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public final Container getTarget() { |
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return this.target; |
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} |
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||
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/** |
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* Returns the axis that was used to lay out components. |
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* Returns one of: |
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* <code>BoxLayout.X_AXIS</code>, |
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* <code>BoxLayout.Y_AXIS</code>, |
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* <code>BoxLayout.LINE_AXIS</code> or |
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* <code>BoxLayout.PAGE_AXIS</code> |
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225 |
* |
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* @return the axis that was used to lay out components |
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* |
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228 |
* @since 1.6 |
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*/ |
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230 |
public final int getAxis() { |
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return this.axis; |
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} |
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233 |
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234 |
/** |
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235 |
* Indicates that a child has changed its layout related information, |
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236 |
* and thus any cached calculations should be flushed. |
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* <p> |
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238 |
* This method is called by AWT when the invalidate method is called |
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* on the Container. Since the invalidate method may be called |
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* asynchronously to the event thread, this method may be called |
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* asynchronously. |
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* |
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* @param target the affected container |
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* |
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* @exception AWTError if the target isn't the container specified to the |
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* BoxLayout constructor |
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*/ |
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public synchronized void invalidateLayout(Container target) { |
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checkContainer(target); |
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xChildren = null; |
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yChildren = null; |
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xTotal = null; |
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yTotal = null; |
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} |
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||
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/** |
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* Not used by this class. |
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* |
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* @param name the name of the component |
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* @param comp the component |
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*/ |
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public void addLayoutComponent(String name, Component comp) { |
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invalidateLayout(comp.getParent()); |
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} |
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/** |
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* Not used by this class. |
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* |
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* @param comp the component |
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*/ |
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public void removeLayoutComponent(Component comp) { |
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invalidateLayout(comp.getParent()); |
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} |
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275 |
/** |
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* Not used by this class. |
|
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* |
|
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* @param comp the component |
|
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* @param constraints constraints |
|
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*/ |
|
281 |
public void addLayoutComponent(Component comp, Object constraints) { |
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invalidateLayout(comp.getParent()); |
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} |
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284 |
||
285 |
/** |
|
286 |
* Returns the preferred dimensions for this layout, given the components |
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287 |
* in the specified target container. |
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* |
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289 |
* @param target the container that needs to be laid out |
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21592 | 290 |
* @return the dimensions >= 0 && <= Integer.MAX_VALUE |
2 | 291 |
* @exception AWTError if the target isn't the container specified to the |
292 |
* BoxLayout constructor |
|
293 |
* @see Container |
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* @see #minimumLayoutSize |
|
295 |
* @see #maximumLayoutSize |
|
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*/ |
|
297 |
public Dimension preferredLayoutSize(Container target) { |
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Dimension size; |
|
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synchronized(this) { |
|
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checkContainer(target); |
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checkRequests(); |
|
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size = new Dimension(xTotal.preferred, yTotal.preferred); |
|
303 |
} |
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304 |
||
305 |
Insets insets = target.getInsets(); |
|
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size.width = (int) Math.min((long) size.width + (long) insets.left + (long) insets.right, Integer.MAX_VALUE); |
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307 |
size.height = (int) Math.min((long) size.height + (long) insets.top + (long) insets.bottom, Integer.MAX_VALUE); |
|
308 |
return size; |
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309 |
} |
|
310 |
||
311 |
/** |
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312 |
* Returns the minimum dimensions needed to lay out the components |
|
313 |
* contained in the specified target container. |
|
314 |
* |
|
315 |
* @param target the container that needs to be laid out |
|
21592 | 316 |
* @return the dimensions >= 0 && <= Integer.MAX_VALUE |
2 | 317 |
* @exception AWTError if the target isn't the container specified to the |
318 |
* BoxLayout constructor |
|
319 |
* @see #preferredLayoutSize |
|
320 |
* @see #maximumLayoutSize |
|
321 |
*/ |
|
322 |
public Dimension minimumLayoutSize(Container target) { |
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323 |
Dimension size; |
|
324 |
synchronized(this) { |
|
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checkContainer(target); |
|
326 |
checkRequests(); |
|
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size = new Dimension(xTotal.minimum, yTotal.minimum); |
|
328 |
} |
|
329 |
||
330 |
Insets insets = target.getInsets(); |
|
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size.width = (int) Math.min((long) size.width + (long) insets.left + (long) insets.right, Integer.MAX_VALUE); |
|
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size.height = (int) Math.min((long) size.height + (long) insets.top + (long) insets.bottom, Integer.MAX_VALUE); |
|
333 |
return size; |
|
334 |
} |
|
335 |
||
336 |
/** |
|
337 |
* Returns the maximum dimensions the target container can use |
|
338 |
* to lay out the components it contains. |
|
339 |
* |
|
340 |
* @param target the container that needs to be laid out |
|
21592 | 341 |
* @return the dimensions >= 0 && <= Integer.MAX_VALUE |
2 | 342 |
* @exception AWTError if the target isn't the container specified to the |
343 |
* BoxLayout constructor |
|
344 |
* @see #preferredLayoutSize |
|
345 |
* @see #minimumLayoutSize |
|
346 |
*/ |
|
347 |
public Dimension maximumLayoutSize(Container target) { |
|
348 |
Dimension size; |
|
349 |
synchronized(this) { |
|
350 |
checkContainer(target); |
|
351 |
checkRequests(); |
|
352 |
size = new Dimension(xTotal.maximum, yTotal.maximum); |
|
353 |
} |
|
354 |
||
355 |
Insets insets = target.getInsets(); |
|
356 |
size.width = (int) Math.min((long) size.width + (long) insets.left + (long) insets.right, Integer.MAX_VALUE); |
|
357 |
size.height = (int) Math.min((long) size.height + (long) insets.top + (long) insets.bottom, Integer.MAX_VALUE); |
|
358 |
return size; |
|
359 |
} |
|
360 |
||
361 |
/** |
|
362 |
* Returns the alignment along the X axis for the container. |
|
363 |
* If the box is horizontal, the default |
|
364 |
* alignment will be returned. Otherwise, the alignment needed |
|
365 |
* to place the children along the X axis will be returned. |
|
366 |
* |
|
367 |
* @param target the container |
|
21592 | 368 |
* @return the alignment >= 0.0f && <= 1.0f |
2 | 369 |
* @exception AWTError if the target isn't the container specified to the |
370 |
* BoxLayout constructor |
|
371 |
*/ |
|
372 |
public synchronized float getLayoutAlignmentX(Container target) { |
|
373 |
checkContainer(target); |
|
374 |
checkRequests(); |
|
375 |
return xTotal.alignment; |
|
376 |
} |
|
377 |
||
378 |
/** |
|
379 |
* Returns the alignment along the Y axis for the container. |
|
380 |
* If the box is vertical, the default |
|
381 |
* alignment will be returned. Otherwise, the alignment needed |
|
382 |
* to place the children along the Y axis will be returned. |
|
383 |
* |
|
384 |
* @param target the container |
|
21592 | 385 |
* @return the alignment >= 0.0f && <= 1.0f |
2 | 386 |
* @exception AWTError if the target isn't the container specified to the |
387 |
* BoxLayout constructor |
|
388 |
*/ |
|
389 |
public synchronized float getLayoutAlignmentY(Container target) { |
|
390 |
checkContainer(target); |
|
391 |
checkRequests(); |
|
392 |
return yTotal.alignment; |
|
393 |
} |
|
394 |
||
395 |
/** |
|
396 |
* Called by the AWT <!-- XXX CHECK! --> when the specified container |
|
397 |
* needs to be laid out. |
|
398 |
* |
|
399 |
* @param target the container to lay out |
|
400 |
* |
|
401 |
* @exception AWTError if the target isn't the container specified to the |
|
402 |
* BoxLayout constructor |
|
403 |
*/ |
|
404 |
public void layoutContainer(Container target) { |
|
405 |
checkContainer(target); |
|
406 |
int nChildren = target.getComponentCount(); |
|
407 |
int[] xOffsets = new int[nChildren]; |
|
408 |
int[] xSpans = new int[nChildren]; |
|
409 |
int[] yOffsets = new int[nChildren]; |
|
410 |
int[] ySpans = new int[nChildren]; |
|
411 |
||
412 |
Dimension alloc = target.getSize(); |
|
413 |
Insets in = target.getInsets(); |
|
414 |
alloc.width -= in.left + in.right; |
|
415 |
alloc.height -= in.top + in.bottom; |
|
416 |
||
417 |
// Resolve axis to an absolute value (either X_AXIS or Y_AXIS) |
|
418 |
ComponentOrientation o = target.getComponentOrientation(); |
|
419 |
int absoluteAxis = resolveAxis( axis, o ); |
|
420 |
boolean ltr = (absoluteAxis != axis) ? o.isLeftToRight() : true; |
|
421 |
||
422 |
||
423 |
// determine the child placements |
|
424 |
synchronized(this) { |
|
425 |
checkRequests(); |
|
426 |
||
427 |
if (absoluteAxis == X_AXIS) { |
|
428 |
SizeRequirements.calculateTiledPositions(alloc.width, xTotal, |
|
429 |
xChildren, xOffsets, |
|
430 |
xSpans, ltr); |
|
431 |
SizeRequirements.calculateAlignedPositions(alloc.height, yTotal, |
|
432 |
yChildren, yOffsets, |
|
433 |
ySpans); |
|
434 |
} else { |
|
435 |
SizeRequirements.calculateAlignedPositions(alloc.width, xTotal, |
|
436 |
xChildren, xOffsets, |
|
437 |
xSpans, ltr); |
|
438 |
SizeRequirements.calculateTiledPositions(alloc.height, yTotal, |
|
439 |
yChildren, yOffsets, |
|
440 |
ySpans); |
|
441 |
} |
|
442 |
} |
|
443 |
||
444 |
// flush changes to the container |
|
445 |
for (int i = 0; i < nChildren; i++) { |
|
446 |
Component c = target.getComponent(i); |
|
447 |
c.setBounds((int) Math.min((long) in.left + (long) xOffsets[i], Integer.MAX_VALUE), |
|
448 |
(int) Math.min((long) in.top + (long) yOffsets[i], Integer.MAX_VALUE), |
|
449 |
xSpans[i], ySpans[i]); |
|
450 |
||
451 |
} |
|
452 |
if (dbg != null) { |
|
453 |
for (int i = 0; i < nChildren; i++) { |
|
454 |
Component c = target.getComponent(i); |
|
455 |
dbg.println(c.toString()); |
|
456 |
dbg.println("X: " + xChildren[i]); |
|
457 |
dbg.println("Y: " + yChildren[i]); |
|
458 |
} |
|
459 |
} |
|
460 |
||
461 |
} |
|
462 |
||
463 |
void checkContainer(Container target) { |
|
464 |
if (this.target != target) { |
|
465 |
throw new AWTError("BoxLayout can't be shared"); |
|
466 |
} |
|
467 |
} |
|
468 |
||
469 |
void checkRequests() { |
|
470 |
if (xChildren == null || yChildren == null) { |
|
471 |
// The requests have been invalidated... recalculate |
|
472 |
// the request information. |
|
473 |
int n = target.getComponentCount(); |
|
474 |
xChildren = new SizeRequirements[n]; |
|
475 |
yChildren = new SizeRequirements[n]; |
|
476 |
for (int i = 0; i < n; i++) { |
|
477 |
Component c = target.getComponent(i); |
|
478 |
if (!c.isVisible()) { |
|
479 |
xChildren[i] = new SizeRequirements(0,0,0, c.getAlignmentX()); |
|
480 |
yChildren[i] = new SizeRequirements(0,0,0, c.getAlignmentY()); |
|
481 |
continue; |
|
482 |
} |
|
483 |
Dimension min = c.getMinimumSize(); |
|
484 |
Dimension typ = c.getPreferredSize(); |
|
485 |
Dimension max = c.getMaximumSize(); |
|
486 |
xChildren[i] = new SizeRequirements(min.width, typ.width, |
|
487 |
max.width, |
|
488 |
c.getAlignmentX()); |
|
489 |
yChildren[i] = new SizeRequirements(min.height, typ.height, |
|
490 |
max.height, |
|
491 |
c.getAlignmentY()); |
|
492 |
} |
|
493 |
||
494 |
// Resolve axis to an absolute value (either X_AXIS or Y_AXIS) |
|
495 |
int absoluteAxis = resolveAxis(axis,target.getComponentOrientation()); |
|
496 |
||
497 |
if (absoluteAxis == X_AXIS) { |
|
498 |
xTotal = SizeRequirements.getTiledSizeRequirements(xChildren); |
|
499 |
yTotal = SizeRequirements.getAlignedSizeRequirements(yChildren); |
|
500 |
} else { |
|
501 |
xTotal = SizeRequirements.getAlignedSizeRequirements(xChildren); |
|
502 |
yTotal = SizeRequirements.getTiledSizeRequirements(yChildren); |
|
503 |
} |
|
504 |
} |
|
505 |
} |
|
506 |
||
507 |
/** |
|
508 |
* Given one of the 4 axis values, resolve it to an absolute axis. |
|
509 |
* The relative axis values, PAGE_AXIS and LINE_AXIS are converted |
|
510 |
* to their absolute couterpart given the target's ComponentOrientation |
|
511 |
* value. The absolute axes, X_AXIS and Y_AXIS are returned unmodified. |
|
512 |
* |
|
513 |
* @param axis the axis to resolve |
|
514 |
* @param o the ComponentOrientation to resolve against |
|
515 |
* @return the resolved axis |
|
516 |
*/ |
|
517 |
private int resolveAxis( int axis, ComponentOrientation o ) { |
|
518 |
int absoluteAxis; |
|
519 |
if( axis == LINE_AXIS ) { |
|
520 |
absoluteAxis = o.isHorizontal() ? X_AXIS : Y_AXIS; |
|
521 |
} else if( axis == PAGE_AXIS ) { |
|
522 |
absoluteAxis = o.isHorizontal() ? Y_AXIS : X_AXIS; |
|
523 |
} else { |
|
524 |
absoluteAxis = axis; |
|
525 |
} |
|
526 |
return absoluteAxis; |
|
527 |
} |
|
528 |
||
529 |
||
530 |
private int axis; |
|
531 |
private Container target; |
|
532 |
||
533 |
private transient SizeRequirements[] xChildren; |
|
534 |
private transient SizeRequirements[] yChildren; |
|
535 |
private transient SizeRequirements xTotal; |
|
536 |
private transient SizeRequirements yTotal; |
|
537 |
||
538 |
private transient PrintStream dbg; |
|
539 |
} |