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java.lang.Objectcom.jgraph.plaf.basic.BasicGraphDropTargetListener
COPY OF JAVAX.SWING.PLAF.BASIC WITH A PUBLIC MODIFIER AND CONSTRUCTOR
The Swing DropTarget implementation supports multicast notification to listeners, so this implementation is used as an additional listener that extends the primary drop target functionality (i.e. linkage to the TransferHandler) to include autoscroll and establish an insertion point for the drop. This is used by the ComponentUI of components supporting a selection mechanism, which have a way of indicating a location within their model.
The autoscroll functionality is based upon the Swing scrolling mechanism of the Scrollable interface. The unit scroll increment is used to as the scroll amount, and the scrolling is based upon JComponent.getVisibleRect and JComponent.scrollRectToVisible. The band of area around the visible rectangle used to invoke autoscroll is based upon the unit scroll increment as that is assumed to represent the last possible item in the visible region.
The subclasses are expected to implement the following methods to manage the insertion location via the components selection mechanism.
Constructor Summary | |
BasicGraphDropTargetListener()
construct a DropTargetAutoScroller |
Method Summary | |
void |
actionPerformed(java.awt.event.ActionEvent e)
The timer fired, perform autoscroll if the pointer is within the autoscroll region. |
void |
dragEnter(java.awt.dnd.DropTargetDragEvent e)
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void |
dragExit(java.awt.dnd.DropTargetEvent e)
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void |
dragOver(java.awt.dnd.DropTargetDragEvent e)
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void |
drop(java.awt.dnd.DropTargetDropEvent e)
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void |
dropActionChanged(java.awt.dnd.DropTargetDragEvent e)
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protected void |
restoreComponentState(javax.swing.JComponent c)
called to restore the state of a component in case a drop is not performed. |
protected void |
restoreComponentStateForDrop(javax.swing.JComponent c)
called to restore the state of a component in case a drop is performed. |
protected void |
saveComponentState(javax.swing.JComponent c)
called to save the state of a component in case it needs to be restored because a drop is not performed. |
protected void |
updateInsertionLocation(javax.swing.JComponent c,
java.awt.Point p)
called to set the insertion location to match the current mouse pointer coordinates. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public BasicGraphDropTargetListener()
Method Detail |
protected void saveComponentState(javax.swing.JComponent c)
protected void restoreComponentState(javax.swing.JComponent c)
protected void restoreComponentStateForDrop(javax.swing.JComponent c)
protected void updateInsertionLocation(javax.swing.JComponent c, java.awt.Point p)
public void actionPerformed(java.awt.event.ActionEvent e)
actionPerformed
in interface java.awt.event.ActionListener
e
- the ActionEvent
public void dragEnter(java.awt.dnd.DropTargetDragEvent e)
dragEnter
in interface java.awt.dnd.DropTargetListener
public void dragOver(java.awt.dnd.DropTargetDragEvent e)
dragOver
in interface java.awt.dnd.DropTargetListener
public void dragExit(java.awt.dnd.DropTargetEvent e)
dragExit
in interface java.awt.dnd.DropTargetListener
public void drop(java.awt.dnd.DropTargetDropEvent e)
drop
in interface java.awt.dnd.DropTargetListener
public void dropActionChanged(java.awt.dnd.DropTargetDragEvent e)
dropActionChanged
in interface java.awt.dnd.DropTargetListener
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