diff options
Diffstat (limited to 'libjava/classpath/java/awt/dnd/DragSource.java')
| -rw-r--r-- | libjava/classpath/java/awt/dnd/DragSource.java | 124 |
1 files changed, 87 insertions, 37 deletions
diff --git a/libjava/classpath/java/awt/dnd/DragSource.java b/libjava/classpath/java/awt/dnd/DragSource.java index 05eb6709d47..48fa2388ee2 100644 --- a/libjava/classpath/java/awt/dnd/DragSource.java +++ b/libjava/classpath/java/awt/dnd/DragSource.java @@ -38,6 +38,8 @@ exception statement from your version. */ package java.awt.dnd; +import gnu.classpath.NotImplementedException; + import java.awt.Component; import java.awt.Cursor; import java.awt.GraphicsEnvironment; @@ -70,9 +72,12 @@ public class DragSource implements Serializable public static final Cursor DefaultLinkNoDrop = null; private transient FlavorMap flavorMap = SystemFlavorMap.getDefaultFlavorMap (); - private transient DragSourceListener dragSourceListener; private transient DragSourceMotionListener dragSourceMotionListener; + + private static DragSource ds; + private DragSourceContextPeer peer; + private DragSourceContext context; /** * Initializes the drag source. @@ -82,19 +87,34 @@ public class DragSource implements Serializable public DragSource() { if (GraphicsEnvironment.isHeadless()) - throw new HeadlessException (); + { + ds = null; + throw new HeadlessException(); + } } /** + * Gets the default drag source. + * * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true. */ public static DragSource getDefaultDragSource() { - return new DragSource(); + if (GraphicsEnvironment.isHeadless()) + { + ds = null; + throw new HeadlessException(); + } + + if (ds == null) + ds = new DragSource(); + return ds; } public static boolean isDragImageSupported() + throws NotImplementedException { + // FIXME: Implement this return false; } @@ -110,6 +130,43 @@ public class DragSource implements Serializable Transferable trans, DragSourceListener dsl, FlavorMap map) { + // http://www.javaworld.com/javaworld/jw-03-1999/jw-03-dragndrop.html + + // This function creates a DragSourceContext object. This object tracks the + // state of the operation by listening to a native peer. In this situation, + // the DragSource may be obtained from the event or by an instance variable. + // This function also creates a new DragSourceContextPeer. + + // This function sends the same message to the context, which then forwards + // it to the peer, passing itself as a parameter. Now, the native system has + // access to the Transferable through the context. + + // FIXME: Add check to determine if dragging. + + try + { + flavorMap = map; + + if (peer == null) + peer = Toolkit.getDefaultToolkit().createDragSourceContextPeer(trigger); + + if (context == null) + context = createDragSourceContext(peer, trigger, + dragCursor, + dragImage, + imageOffset, trans, + dsl); + + if (peer == null) + throw new InvalidDnDOperationException(); + + peer.startDrag(context, dragCursor, dragImage, imageOffset); + } + catch (Exception e) + { + throw new InvalidDnDOperationException("Drag and Drop system is " + + "unable to initiate a drag operation."); + } } /** @@ -156,7 +213,7 @@ public class DragSource implements Serializable /** * Creates the DragSourceContext to handle this drag. * - * @exception IllegalArgumentException FIXME + * @exception IllegalArgumentException * @exception NullPointerException If dscp, dgl, dragImage or t is null. */ protected DragSourceContext @@ -164,7 +221,7 @@ public class DragSource implements Serializable Cursor cursor, Image image, Point offset, Transferable t, DragSourceListener dsl) { - return null; + return new DragSourceContext(peer, dge, cursor, image, offset, t, dsl); } public FlavorMap getFlavorMap() @@ -172,42 +229,22 @@ public class DragSource implements Serializable return flavorMap; } - /** - * Dummy DragGestureRecognizer when Toolkit doesn't support drag and drop. - */ - static class NoDragGestureRecognizer extends DragGestureRecognizer - { - NoDragGestureRecognizer(DragSource ds, Component c, int actions, - DragGestureListener dgl) - { - super(ds, c, actions, dgl); - } - - protected void registerListeners() { } - protected void unregisterListeners() { } - } - - public DragGestureRecognizer - createDragGestureRecognizer(Class recognizer, Component c, int actions, - DragGestureListener dgl) + public DragGestureRecognizer createDragGestureRecognizer(Class recognizer, + Component c, + int actions, + DragGestureListener dgl) { - DragGestureRecognizer dgr; - dgr = Toolkit.getDefaultToolkit () - .createDragGestureRecognizer (recognizer, this, c, actions, - dgl); - - if (dgr == null) - dgr = new NoDragGestureRecognizer(this, c, actions, dgl); - - return dgr; + return Toolkit.getDefaultToolkit().createDragGestureRecognizer(recognizer, + this, c, + actions, dgl); } - public DragGestureRecognizer - createDefaultDragGestureRecognizer(Component c, int actions, - DragGestureListener dgl) + public DragGestureRecognizer createDefaultDragGestureRecognizer(Component c, + int actions, + DragGestureListener dgl) { - return createDragGestureRecognizer (MouseDragGestureRecognizer.class, c, - actions, dgl); + return createDragGestureRecognizer(MouseDragGestureRecognizer.class, c, + actions, dgl); } /** @@ -275,4 +312,17 @@ public class DragSource implements Serializable // Return an empty EventListener array. return new EventListener [0]; } + + /** + * TODO + * @return + * + * @since 1.5 + */ + public static int getDragThreshold() + throws NotImplementedException + { + // FIXME: Not implemented. + return 4; + } } // class DragSource |