author | prr |
Fri, 23 May 2014 09:05:24 -0700 | |
changeset 24567 | a0ebe5fd56ff |
parent 23697 | e556a715949f |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2014, 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 sun.awt.ModalExclude; |
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import sun.awt.SunToolkit; |
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/** |
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* Popups are used to display a <code>Component</code> to the user, typically |
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* on top of all the other <code>Component</code>s in a particular containment |
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* hierarchy. <code>Popup</code>s have a very small life cycle. Once you |
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* have obtained a <code>Popup</code>, and hidden it (invoked the |
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* <code>hide</code> method), you should no longer |
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* invoke any methods on it. This allows the <code>PopupFactory</code> to cache |
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* <code>Popup</code>s for later use. |
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* <p> |
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* The general contract is that if you need to change the size of the |
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* <code>Component</code>, or location of the <code>Popup</code>, you should |
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* obtain a new <code>Popup</code>. |
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* <p> |
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* <code>Popup</code> does not descend from <code>Component</code>, rather |
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* implementations of <code>Popup</code> are responsible for creating |
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* and maintaining their own <code>Component</code>s to render the |
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* requested <code>Component</code> to the user. |
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* <p> |
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* You typically do not explicitly create an instance of <code>Popup</code>, |
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* instead obtain one from a <code>PopupFactory</code>. |
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* |
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* @see PopupFactory |
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* |
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* @since 1.4 |
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*/ |
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public class Popup { |
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/** |
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* The Component representing the Popup. |
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*/ |
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private Component component; |
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/** |
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* Creates a <code>Popup</code> for the Component <code>owner</code> |
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* containing the Component <code>contents</code>. <code>owner</code> |
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* is used to determine which <code>Window</code> the new |
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* <code>Popup</code> will parent the <code>Component</code> the |
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* <code>Popup</code> creates to. |
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* A null <code>owner</code> implies there is no valid parent. |
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* <code>x</code> and |
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* <code>y</code> specify the preferred initial location to place |
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* the <code>Popup</code> at. Based on screen size, or other paramaters, |
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* the <code>Popup</code> may not display at <code>x</code> and |
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* <code>y</code>. |
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* |
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* @param owner Component mouse coordinates are relative to, may be null |
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* @param contents Contents of the Popup |
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* @param x Initial x screen coordinate |
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* @param y Initial y screen coordinate |
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* @exception IllegalArgumentException if contents is null |
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*/ |
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protected Popup(Component owner, Component contents, int x, int y) { |
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this(); |
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if (contents == null) { |
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throw new IllegalArgumentException("Contents must be non-null"); |
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} |
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reset(owner, contents, x, y); |
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} |
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/** |
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* Creates a <code>Popup</code>. This is provided for subclasses. |
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*/ |
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protected Popup() { |
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} |
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/** |
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* Makes the <code>Popup</code> visible. If the <code>Popup</code> is |
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* currently visible, this has no effect. |
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*/ |
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@SuppressWarnings("deprecation") |
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public void show() { |
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Component component = getComponent(); |
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if (component != null) { |
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component.show(); |
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} |
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} |
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/** |
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* Hides and disposes of the <code>Popup</code>. Once a <code>Popup</code> |
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* has been disposed you should no longer invoke methods on it. A |
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* <code>dispose</code>d <code>Popup</code> may be reclaimed and later used |
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* based on the <code>PopupFactory</code>. As such, if you invoke methods |
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* on a <code>disposed</code> <code>Popup</code>, indeterminate |
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* behavior will result. |
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*/ |
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@SuppressWarnings("deprecation") |
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public void hide() { |
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Component component = getComponent(); |
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if (component instanceof JWindow) { |
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component.hide(); |
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((JWindow)component).getContentPane().removeAll(); |
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} |
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dispose(); |
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} |
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/** |
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* Frees any resources the <code>Popup</code> may be holding onto. |
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*/ |
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void dispose() { |
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Component component = getComponent(); |
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Window window = SwingUtilities.getWindowAncestor(component); |
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if (component instanceof JWindow) { |
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((Window)component).dispose(); |
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component = null; |
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} |
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// If our parent is a DefaultFrame, we need to dispose it, too. |
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if (window instanceof DefaultFrame) { |
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window.dispose(); |
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} |
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} |
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/** |
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* Resets the <code>Popup</code> to an initial state. |
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*/ |
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void reset(Component owner, Component contents, int ownerX, int ownerY) { |
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if (getComponent() == null) { |
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component = createComponent(owner); |
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} |
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Component c = getComponent(); |
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if (c instanceof JWindow) { |
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JWindow component = (JWindow)getComponent(); |
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component.setLocation(ownerX, ownerY); |
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component.getContentPane().add(contents, BorderLayout.CENTER); |
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component.invalidate(); |
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component.validate(); |
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if(component.isVisible()) { |
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// Do not call pack() if window is not visible to |
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// avoid early native peer creation |
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pack(); |
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} |
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} |
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} |
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/** |
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* Causes the <code>Popup</code> to be sized to fit the preferred size |
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* of the <code>Component</code> it contains. |
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*/ |
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void pack() { |
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Component component = getComponent(); |
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if (component instanceof Window) { |
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((Window)component).pack(); |
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} |
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} |
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/** |
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* Returns the <code>Window</code> to use as the parent of the |
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* <code>Window</code> created for the <code>Popup</code>. This creates |
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* a new <code>DefaultFrame</code>, if necessary. |
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*/ |
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private Window getParentWindow(Component owner) { |
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Window window = null; |
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if (owner instanceof Window) { |
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window = (Window)owner; |
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} |
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else if (owner != null) { |
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window = SwingUtilities.getWindowAncestor(owner); |
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} |
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if (window == null) { |
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window = new DefaultFrame(); |
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} |
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return window; |
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} |
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/** |
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* Creates the Component to use as the parent of the <code>Popup</code>. |
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* The default implementation creates a <code>Window</code>, subclasses |
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* should override. |
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*/ |
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Component createComponent(Component owner) { |
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if (GraphicsEnvironment.isHeadless()) { |
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// Generally not useful, bail. |
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return null; |
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} |
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return new HeavyWeightWindow(getParentWindow(owner)); |
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} |
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/** |
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* Returns the <code>Component</code> returned from |
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* <code>createComponent</code> that will hold the <code>Popup</code>. |
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*/ |
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Component getComponent() { |
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return component; |
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} |
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/** |
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* Component used to house window. |
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*/ |
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@SuppressWarnings("serial") // Superclass is not serializable across versions |
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static class HeavyWeightWindow extends JWindow implements ModalExclude { |
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HeavyWeightWindow(Window parent) { |
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super(parent); |
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setFocusableWindowState(false); |
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setType(Window.Type.POPUP); |
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// Popups are typically transient and most likely won't benefit |
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// from true double buffering. Turn it off here. |
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getRootPane().setUseTrueDoubleBuffering(false); |
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// Try to set "always-on-top" for the popup window. |
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// Applets usually don't have sufficient permissions to do it. |
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// In this case simply ignore the exception. |
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try { |
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setAlwaysOnTop(true); |
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} catch (SecurityException se) { |
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// setAlwaysOnTop is restricted, |
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// the exception is ignored |
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} |
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} |
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public void update(Graphics g) { |
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paint(g); |
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} |
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public void show() { |
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this.pack(); |
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if (getWidth() > 0 && getHeight() > 0) { |
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super.show(); |
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} |
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} |
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} |
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/** |
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* Used if no valid Window ancestor of the supplied owner is found. |
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* <p> |
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* PopupFactory uses this as a way to know when the Popup shouldn't |
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* be cached based on the Window. |
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*/ |
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@SuppressWarnings("serial") // JDK-implementation class |
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static class DefaultFrame extends Frame { |
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} |
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} |