517 lines
18 KiB
Java
517 lines
18 KiB
Java
/*
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* Copyright (c) 2013, 2018, 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 sun.swing;
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import java.awt.BorderLayout;
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import java.awt.Color;
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import java.awt.Component;
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import java.awt.Container;
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import java.awt.Dimension;
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import java.awt.EventQueue;
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.MouseInfo;
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import java.awt.Point;
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import java.awt.Rectangle;
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import java.awt.Window;
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import java.awt.dnd.DragGestureEvent;
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import java.awt.dnd.DragGestureListener;
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import java.awt.dnd.DragGestureRecognizer;
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import java.awt.dnd.DragSource;
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import java.awt.dnd.DropTarget;
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import java.awt.dnd.InvalidDnDOperationException;
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import java.awt.dnd.peer.DragSourceContextPeer;
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import java.awt.event.ContainerEvent;
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import java.awt.event.ContainerListener;
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import java.awt.image.BufferedImage;
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import java.awt.image.DataBufferInt;
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import java.beans.PropertyChangeEvent;
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import java.beans.PropertyChangeListener;
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import java.security.AccessController;
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import javax.swing.JComponent;
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import javax.swing.JLayeredPane;
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import javax.swing.JPanel;
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import javax.swing.JRootPane;
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import javax.swing.LayoutFocusTraversalPolicy;
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import javax.swing.RepaintManager;
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import javax.swing.RootPaneContainer;
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import javax.swing.SwingUtilities;
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import sun.awt.AWTAccessor;
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import sun.awt.DisplayChangedListener;
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import sun.awt.LightweightFrame;
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import sun.awt.OverrideNativeWindowHandle;
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import sun.security.action.GetPropertyAction;
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import sun.swing.SwingUtilities2.RepaintListener;
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/**
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* The frame serves as a lightweight container which paints its content
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* to an offscreen image and provides access to the image's data via the
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* {@link LightweightContent} interface. Note, that it may not be shown
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* as a standalone toplevel frame. Its purpose is to provide functionality
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* for lightweight embedding.
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*
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* @author Artem Ananiev
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* @author Anton Tarasov
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*/
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public final class JLightweightFrame extends LightweightFrame implements RootPaneContainer {
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private final JRootPane rootPane = new JRootPane();
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private LightweightContent content;
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private Component component;
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private JPanel contentPane;
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private BufferedImage bbImage;
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private volatile int scaleFactor = 1;
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/**
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* {@code copyBufferEnabled}, true by default, defines the following strategy.
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* A duplicating (copy) buffer is created for the original pixel buffer.
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* The copy buffer is synchronized with the original buffer every time the
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* latter changes. {@code JLightweightFrame} passes the copy buffer array
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* to the {@link LightweightContent#imageBufferReset} method. The code spot
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* which synchronizes two buffers becomes the only critical section guarded
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* by the lock (managed with the {@link LightweightContent#paintLock()},
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* {@link LightweightContent#paintUnlock()} methods).
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*/
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private static boolean copyBufferEnabled;
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private int[] copyBuffer;
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private PropertyChangeListener layoutSizeListener;
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private RepaintListener repaintListener;
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static {
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SwingAccessor.setJLightweightFrameAccessor(new SwingAccessor.JLightweightFrameAccessor() {
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@Override
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public void updateCursor(JLightweightFrame frame) {
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frame.updateClientCursor();
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}
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});
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copyBufferEnabled = "true".equals(AccessController.
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doPrivileged(new GetPropertyAction("swing.jlf.copyBufferEnabled", "true")));
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}
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/**
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* Constructs a new, initially invisible {@code JLightweightFrame}
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* instance.
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*/
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public JLightweightFrame() {
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super();
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copyBufferEnabled = "true".equals(AccessController.
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doPrivileged(new GetPropertyAction("swing.jlf.copyBufferEnabled", "true")));
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add(rootPane, BorderLayout.CENTER);
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setFocusTraversalPolicy(new LayoutFocusTraversalPolicy());
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if (getGraphicsConfiguration().isTranslucencyCapable()) {
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setBackground(new Color(0, 0, 0, 0));
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}
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layoutSizeListener = new PropertyChangeListener() {
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@Override
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public void propertyChange(PropertyChangeEvent e) {
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Dimension d = (Dimension)e.getNewValue();
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if ("preferredSize".equals(e.getPropertyName())) {
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content.preferredSizeChanged(d.width, d.height);
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} else if ("maximumSize".equals(e.getPropertyName())) {
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content.maximumSizeChanged(d.width, d.height);
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} else if ("minimumSize".equals(e.getPropertyName())) {
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content.minimumSizeChanged(d.width, d.height);
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}
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}
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};
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repaintListener = (JComponent c, int x, int y, int w, int h) -> {
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Window jlf = SwingUtilities.getWindowAncestor(c);
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if (jlf != JLightweightFrame.this) {
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return;
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}
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Point p = SwingUtilities.convertPoint(c, x, y, jlf);
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Rectangle r = new Rectangle(p.x, p.y, w, h).intersection(
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new Rectangle(0, 0, bbImage.getWidth() / scaleFactor,
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bbImage.getHeight() / scaleFactor));
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if (!r.isEmpty()) {
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notifyImageUpdated(r.x, r.y, r.width, r.height);
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}
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};
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SwingAccessor.getRepaintManagerAccessor().addRepaintListener(
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RepaintManager.currentManager(this), repaintListener);
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}
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@Override
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public void dispose() {
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SwingAccessor.getRepaintManagerAccessor().removeRepaintListener(
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RepaintManager.currentManager(this), repaintListener);
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super.dispose();
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}
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/**
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* Sets the {@link LightweightContent} instance for this frame.
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* The {@code JComponent} object returned by the
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* {@link LightweightContent#getComponent()} method is immediately
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* added to the frame's content pane.
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*
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* @param content the {@link LightweightContent} instance
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*/
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public void setContent(final LightweightContent content) {
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if (content == null) {
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System.err.println("JLightweightFrame.setContent: content may not be null!");
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return;
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}
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this.content = content;
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this.component = content.getComponent();
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Dimension d = this.component.getPreferredSize();
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content.preferredSizeChanged(d.width, d.height);
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d = this.component.getMaximumSize();
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content.maximumSizeChanged(d.width, d.height);
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d = this.component.getMinimumSize();
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content.minimumSizeChanged(d.width, d.height);
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initInterior();
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}
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@Override
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public Graphics getGraphics() {
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if (bbImage == null) return null;
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Graphics2D g = bbImage.createGraphics();
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g.setBackground(getBackground());
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g.setColor(getForeground());
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g.setFont(getFont());
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g.scale(scaleFactor, scaleFactor);
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return g;
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}
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/**
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* {@inheritDoc}
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*
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* @see LightweightContent#focusGrabbed()
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*/
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@Override
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public void grabFocus() {
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if (content != null) content.focusGrabbed();
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}
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/**
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* {@inheritDoc}
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*
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* @see LightweightContent#focusUngrabbed()
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*/
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@Override
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public void ungrabFocus() {
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if (content != null) content.focusUngrabbed();
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}
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@Override
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public int getScaleFactor() {
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return scaleFactor;
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}
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@Override
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public void notifyDisplayChanged(final int scaleFactor) {
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if (scaleFactor != this.scaleFactor) {
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if (!copyBufferEnabled) content.paintLock();
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try {
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if (bbImage != null) {
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resizeBuffer(getWidth(), getHeight(), scaleFactor);
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}
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} finally {
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if (!copyBufferEnabled) content.paintUnlock();
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}
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this.scaleFactor = scaleFactor;
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}
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if (getPeer() instanceof DisplayChangedListener) {
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((DisplayChangedListener)getPeer()).displayChanged();
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}
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repaint();
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}
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@Override
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public void addNotify() {
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super.addNotify();
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if (getPeer() instanceof DisplayChangedListener) {
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((DisplayChangedListener)getPeer()).displayChanged();
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}
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}
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private void syncCopyBuffer(boolean reset, int x, int y, int w, int h, int scale) {
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content.paintLock();
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try {
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int[] srcBuffer = ((DataBufferInt)bbImage.getRaster().getDataBuffer()).getData();
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if (reset) {
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copyBuffer = new int[srcBuffer.length];
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}
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int linestride = bbImage.getWidth();
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x *= scale;
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y *= scale;
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w *= scale;
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h *= scale;
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for (int i=0; i<h; i++) {
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int from = (y + i) * linestride + x;
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System.arraycopy(srcBuffer, from, copyBuffer, from, w);
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}
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} finally {
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content.paintUnlock();
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}
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}
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private void notifyImageUpdated(int x, int y, int width, int height) {
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if (copyBufferEnabled) {
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syncCopyBuffer(false, x, y, width, height, scaleFactor);
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}
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content.imageUpdated(x, y, width, height);
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}
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private void initInterior() {
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contentPane = new JPanel() {
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@Override
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public void paint(Graphics g) {
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if (!copyBufferEnabled) {
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content.paintLock();
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}
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try {
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super.paint(g);
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final Rectangle clip = g.getClipBounds() != null ?
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g.getClipBounds() :
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new Rectangle(0, 0, contentPane.getWidth(), contentPane.getHeight());
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clip.x = Math.max(0, clip.x);
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clip.y = Math.max(0, clip.y);
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clip.width = Math.min(contentPane.getWidth(), clip.width);
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clip.height = Math.min(contentPane.getHeight(), clip.height);
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EventQueue.invokeLater(new Runnable() {
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@Override
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public void run() {
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Rectangle c = contentPane.getBounds().intersection(clip);
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notifyImageUpdated(c.x, c.y, c.width, c.height);
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}
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});
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} finally {
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if (!copyBufferEnabled) {
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content.paintUnlock();
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}
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}
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}
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@Override
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protected boolean isPaintingOrigin() {
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return true;
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}
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};
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contentPane.setLayout(new BorderLayout());
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contentPane.add(component);
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if ("true".equals(AccessController.
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doPrivileged(new GetPropertyAction("swing.jlf.contentPaneTransparent", "false"))))
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{
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contentPane.setOpaque(false);
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}
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setContentPane(contentPane);
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contentPane.addContainerListener(new ContainerListener() {
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@Override
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public void componentAdded(ContainerEvent e) {
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Component c = JLightweightFrame.this.component;
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if (e.getChild() == c) {
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c.addPropertyChangeListener("preferredSize", layoutSizeListener);
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c.addPropertyChangeListener("maximumSize", layoutSizeListener);
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c.addPropertyChangeListener("minimumSize", layoutSizeListener);
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}
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}
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@Override
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public void componentRemoved(ContainerEvent e) {
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Component c = JLightweightFrame.this.component;
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if (e.getChild() == c) {
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c.removePropertyChangeListener(layoutSizeListener);
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}
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}
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});
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}
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@SuppressWarnings("deprecation")
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@Override public void reshape(int x, int y, int width, int height) {
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super.reshape(x, y, width, height);
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if (width == 0 || height == 0) {
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return;
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}
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if (!copyBufferEnabled) {
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content.paintLock();
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}
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try {
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boolean createBB = (bbImage == null);
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int newW = width;
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int newH = height;
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if (bbImage != null) {
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int imgWidth = bbImage.getWidth() / scaleFactor;
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int imgHeight = bbImage.getHeight() / scaleFactor;
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if (width != imgWidth || height != imgHeight) {
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createBB = true;
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if (bbImage != null) {
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int oldW = imgWidth;
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int oldH = imgHeight;
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if ((oldW >= newW) && (oldH >= newH)) {
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createBB = false;
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} else {
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if (oldW >= newW) {
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newW = oldW;
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} else {
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newW = Math.max((int)(oldW * 1.2), width);
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}
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if (oldH >= newH) {
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newH = oldH;
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} else {
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newH = Math.max((int)(oldH * 1.2), height);
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}
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}
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}
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}
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}
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if (createBB) {
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resizeBuffer(newW, newH, scaleFactor);
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return;
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}
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content.imageReshaped(0, 0, width, height);
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} finally {
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if (!copyBufferEnabled) {
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content.paintUnlock();
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}
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}
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}
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private void resizeBuffer(int width, int height, int newScaleFactor) {
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bbImage = new BufferedImage(width*newScaleFactor,height*newScaleFactor,
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BufferedImage.TYPE_INT_ARGB_PRE);
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int[] pixels= ((DataBufferInt)bbImage.getRaster().getDataBuffer()).getData();
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if (copyBufferEnabled) {
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syncCopyBuffer(true, 0, 0, width, height, newScaleFactor);
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pixels = copyBuffer;
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}
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content.imageBufferReset(pixels, 0, 0, width, height,
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width * newScaleFactor, newScaleFactor);
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}
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@Override
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public JRootPane getRootPane() {
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return rootPane;
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}
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@Override
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public void setContentPane(Container contentPane) {
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getRootPane().setContentPane(contentPane);
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}
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@Override
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public Container getContentPane() {
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return getRootPane().getContentPane();
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}
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@Override
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public void setLayeredPane(JLayeredPane layeredPane) {
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getRootPane().setLayeredPane(layeredPane);
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}
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@Override
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public JLayeredPane getLayeredPane() {
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return getRootPane().getLayeredPane();
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}
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@Override
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public void setGlassPane(Component glassPane) {
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getRootPane().setGlassPane(glassPane);
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}
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@Override
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public Component getGlassPane() {
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return getRootPane().getGlassPane();
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}
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/*
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* Notifies client toolkit that it should change a cursor.
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*
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* Called from the peer via SwingAccessor, because the
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* Component.updateCursorImmediately method is final
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* and could not be overridden.
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*/
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private void updateClientCursor() {
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Point p = MouseInfo.getPointerInfo().getLocation();
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SwingUtilities.convertPointFromScreen(p, this);
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Component target = SwingUtilities.getDeepestComponentAt(this, p.x, p.y);
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if (target != null) {
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content.setCursor(target.getCursor());
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}
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}
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//Called by reflection by SwingNode
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public void overrideNativeWindowHandle(long handle, Runnable closeWindow) {
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final Object peer = AWTAccessor.getComponentAccessor().getPeer(this);
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if (peer instanceof OverrideNativeWindowHandle) {
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((OverrideNativeWindowHandle) peer).overrideWindowHandle(handle);
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}
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if (closeWindow != null) {
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closeWindow.run();
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}
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}
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public <T extends DragGestureRecognizer> T createDragGestureRecognizer(
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Class<T> abstractRecognizerClass,
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DragSource ds, Component c, int srcActions,
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DragGestureListener dgl)
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{
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return content == null ? null : content.createDragGestureRecognizer(
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abstractRecognizerClass, ds, c, srcActions, dgl);
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}
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public DragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException {
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return content == null ? null : content.createDragSourceContextPeer(dge);
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}
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public void addDropTarget(DropTarget dt) {
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if (content == null) return;
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content.addDropTarget(dt);
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}
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public void removeDropTarget(DropTarget dt) {
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if (content == null) return;
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content.removeDropTarget(dt);
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}
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}
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