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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/dnd/DropTarget.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/dnd/DropTarget.java')
-rw-r--r-- | libjava/classpath/java/awt/dnd/DropTarget.java | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/dnd/DropTarget.java b/libjava/classpath/java/awt/dnd/DropTarget.java new file mode 100644 index 000000000..e5180d074 --- /dev/null +++ b/libjava/classpath/java/awt/dnd/DropTarget.java @@ -0,0 +1,438 @@ +/* DropTarget.java -- + Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.awt.dnd; + +import java.awt.Component; +import java.awt.GraphicsEnvironment; +import java.awt.HeadlessException; +import java.awt.Insets; +import java.awt.Point; +import java.awt.Rectangle; +import java.awt.datatransfer.FlavorMap; +import java.awt.datatransfer.SystemFlavorMap; +import java.awt.dnd.peer.DropTargetPeer; +import java.awt.event.ActionEvent; +import java.awt.event.ActionListener; +import java.awt.peer.ComponentPeer; +import java.awt.peer.LightweightPeer; +import java.io.Serializable; +import java.util.EventListener; +import java.util.TooManyListenersException; + +import javax.swing.Timer; + +/** + * @author Michael Koch + * @since 1.2 + */ +public class DropTarget + implements DropTargetListener, EventListener, Serializable +{ + /** + * Compatible with JDK 1.2+ + */ + private static final long serialVersionUID = -6283860791671019047L; + + protected static class DropTargetAutoScroller + implements ActionListener + { + /** + * The threshold that keeps the autoscroller running. + */ + private static final int HYSTERESIS = 10; + + /** + * The initial timer delay. + */ + private static final int DELAY = 100; + + private Component component; + private Point point; + + /** + * The timer that triggers autoscrolling. + */ + private Timer timer; + + /** + * The outer region of the scroller. This is the component's size. + */ + private Rectangle outer; + + /** + * The inner region of the scroller. This is the component size without + * the autoscroll insets. + */ + private Rectangle inner; + + protected DropTargetAutoScroller (Component c, Point p) + { + component = c; + point = p; + timer = new Timer(DELAY, this); + timer.setCoalesce(true); + timer.start(); + } + + protected void updateLocation (Point newLocn) + { + Point previous = point; + point = newLocn; + if (Math.abs(point.x - previous.x) > HYSTERESIS + || Math.abs(point.y - previous.y) > HYSTERESIS) + { + if (timer.isRunning()) + timer.stop(); + } + else + { + if (! timer.isRunning()) + timer.start(); + } + } + + protected void stop () + { + timer.start(); + } + + public void actionPerformed (ActionEvent e) + { + Autoscroll autoScroll = (Autoscroll) component; + + // First synchronize the inner and outer rectangles. + Insets i = autoScroll.getAutoscrollInsets(); + int width = component.getWidth(); + int height = component.getHeight(); + if (width != outer.width || height != outer.height) + outer.setBounds(0, 0, width, height); + if (inner.x != i.left || inner.y != i.top) + inner.setLocation(i.left, i.top); + int inWidth = width - i.left - i.right; + int inHeight = height - i.top - i.bottom; + if (inWidth != inner.width || inHeight != inner.height) + inner.setSize(inWidth, inHeight); + + // Scroll if the outer rectangle contains the location, but the + // inner doesn't. + if (outer.contains(point) && ! inner.contains(point)) + autoScroll.autoscroll(point); + } + } + + private Component component; + private FlavorMap flavorMap; + private int actions; + private DropTargetPeer peer; + private DropTargetContext dropTargetContext; + private DropTargetListener dropTargetListener; + private DropTarget.DropTargetAutoScroller autoscroller; + private boolean active = true; + + /** + * Creates a <code>DropTarget</code> object. + * + * @exception HeadlessException If GraphicsEnvironment.isHeadless() + * returns true. + */ + public DropTarget () + { + this (null, DnDConstants.ACTION_COPY_OR_MOVE, null, true, null); + } + + /** + * Creates a <code>DropTarget</code> object. + * + * @exception HeadlessException If GraphicsEnvironment.isHeadless() + * returns true. + */ + public DropTarget (Component c, DropTargetListener dtl) + { + this (c, DnDConstants.ACTION_COPY_OR_MOVE, dtl, true, null); + } + + /** + * Creates a <code>DropTarget</code> object. + * + * @exception HeadlessException If GraphicsEnvironment.isHeadless() + * returns true. + */ + public DropTarget (Component c, int i, DropTargetListener dtl) + { + this (c, i, dtl, true, null); + } + + /** + * Creates a <code>DropTarget</code> object. + * + * @exception HeadlessException If GraphicsEnvironment.isHeadless() + * returns true. + */ + public DropTarget (Component c, int i, DropTargetListener dtl, boolean b) + { + this (c, i, dtl, b, null); + } + + /** + * Creates a <code>DropTarget</code> object. + * + * @exception HeadlessException If GraphicsEnvironment.isHeadless() + * returns true. + */ + public DropTarget (Component c, int i, DropTargetListener dtl, boolean b, + FlavorMap fm) + { + if (GraphicsEnvironment.isHeadless ()) + throw new HeadlessException (); + + setComponent(c); + setDefaultActions(i); + dropTargetListener = dtl; + + if (fm == null) + flavorMap = SystemFlavorMap.getDefaultFlavorMap(); + else + flavorMap = fm; + + setActive (b); + + if (c != null) + c.setDropTarget(this); + } + + /** + * Sets the component associated with this drop target object. + */ + public void setComponent (Component c) + { + if (component != null) + clearAutoscroll(); + component = c; + } + + /** + * Returns the component associated with this drop target object. + */ + public Component getComponent () + { + return component; + } + + /** + * Sets the default actions. + */ + public void setDefaultActions (int ops) + { + actions = ops; + } + + /** + * Returns the default actions. + */ + public int getDefaultActions () + { + return actions; + } + + public void setActive (boolean active) + { + this.active = active; + if (! active) + clearAutoscroll(); + } + + public boolean isActive() + { + return active; + } + + /** + * Adds a new <code>DropTargetListener</code>. + * + * @exception TooManyListenersException Sun's JDK does not, despite + * documentation, throw this exception here when you install an additional + * <code>DropTargetListener</code>. So to be compatible, we do the same + * thing. + */ + public void addDropTargetListener (DropTargetListener dtl) + throws TooManyListenersException + { + if (dtl == null) + return; + + if (dtl.equals(this)) + throw new IllegalArgumentException(); + + if (dropTargetListener != null) + throw new TooManyListenersException(); + + dropTargetListener = dtl; + } + + public void removeDropTargetListener(DropTargetListener dtl) + { + if (dropTargetListener != null) + dropTargetListener = null; + } + + public void dragEnter(DropTargetDragEvent dtde) + { + if (active) + { + if (dropTargetListener != null) + dropTargetListener.dragEnter(dtde); + initializeAutoscrolling(dtde.getLocation()); + } + } + + public void dragOver(DropTargetDragEvent dtde) + { + if (active) + { + if (dropTargetListener != null) + dropTargetListener.dragOver(dtde); + updateAutoscroll(dtde.getLocation()); + } + } + + public void dropActionChanged(DropTargetDragEvent dtde) + { + if (active) + { + if (dropTargetListener != null) + dropTargetListener.dropActionChanged(dtde); + updateAutoscroll(dtde.getLocation()); + } + } + + public void dragExit(DropTargetEvent dte) + { + if (active) + { + if (dropTargetListener != null) + dropTargetListener.dragExit(dte); + clearAutoscroll(); + } + } + + public void drop(DropTargetDropEvent dtde) + { + clearAutoscroll(); + if (dropTargetListener != null) + dropTargetListener.drop(dtde); + } + + public FlavorMap getFlavorMap() + { + return flavorMap; + } + + public void setFlavorMap(FlavorMap fm) + { + flavorMap = fm; + } + + public void addNotify(ComponentPeer p) + { + Component c = component; + while (c != null && p instanceof LightweightPeer) + { + p = c.getPeer(); + c = c.getParent(); + } + + if (p instanceof DropTargetPeer) + { + peer = ((DropTargetPeer) p); + peer.addDropTarget(this); + } + else + peer = null; + } + + public void removeNotify(ComponentPeer p) + { + ((DropTargetPeer) peer).removeDropTarget(this); + peer = null; + p = null; + } + + public DropTargetContext getDropTargetContext() + { + if (dropTargetContext == null) + dropTargetContext = createDropTargetContext (); + + return dropTargetContext; + } + + protected DropTargetContext createDropTargetContext() + { + if (dropTargetContext == null) + dropTargetContext = new DropTargetContext (this); + + return dropTargetContext; + } + + protected DropTarget.DropTargetAutoScroller createDropTargetAutoScroller + (Component c, Point p) + { + return new DropTarget.DropTargetAutoScroller (c, p); + } + + protected void initializeAutoscrolling(Point p) + { + if (component instanceof Autoscroll) // Checks for null too. + autoscroller = createDropTargetAutoScroller (component, p); + } + + protected void updateAutoscroll(Point dragCursorLocn) + { + if (autoscroller != null) + autoscroller.updateLocation(dragCursorLocn); + } + + protected void clearAutoscroll() + { + if (autoscroller != null) + { + autoscroller.stop(); + autoscroller = null; + } + } +} // class DropTarget |