Java DragSourceContextPeer类代码示例

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
public void startDrag(DragGestureEvent trigger, Cursor dragCursor, 
                      Image dragImage, Point imageOffset, 
                      Transferable transferable, DragSourceListener dsl,
                      FlavorMap flavorMap)
        throws InvalidDnDOperationException {

    if (curContext != null) {
        // awt.171=Attempt to start a drag while an existing drag operation is still executing.
        throw new InvalidDnDOperationException(Messages.getString("awt.171"));  //$NON-NLS-1$
    }

    DragSourceContextPeer peer =
        Toolkit.getDefaultToolkit().createDragSourceContextPeer(trigger);
    curContext = createDragSourceContext(peer, trigger, dragCursor,
                                         dragImage, imageOffset,
                                         transferable, dsl);

    peer.startDrag(curContext, dragCursor, dragImage, imageOffset);
    curContext = null;
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
/**
 * Start a drag, given the <code>DragGestureEvent</code>
 * that initiated the drag, the initial
 * <code>Cursor</code> to use,
 * the <code>Image</code> to drag,
 * the offset of the <code>Image</code> origin
 * from the hotspot of the <code>Cursor</code> at
 * the instant of the trigger,
 * the <code>Transferable</code> subject data
 * of the drag, the <code>DragSourceListener</code>,
 * and the <code>FlavorMap</code>.
 * <P>
 * @param trigger        the <code>DragGestureEvent</code> that initiated the drag
 * @param dragCursor     the initial {@code Cursor} for this drag operation
 *                       or {@code null} for the default cursor handling;
 *                       see <a href="DragSourceContext.html#defaultCursor">DragSourceContext</a>
 *                       for more details on the cursor handling mechanism during drag and drop
 * @param dragImage      the image to drag or {@code null}
 * @param imageOffset    the offset of the <code>Image</code> origin from the hotspot
 *                       of the <code>Cursor</code> at the instant of the trigger
 * @param transferable   the subject data of the drag
 * @param dsl            the <code>DragSourceListener</code>
 * @param flavorMap      the <code>FlavorMap</code> to use, or <code>null</code>
 * <P>
 * @throws java.awt.dnd.InvalidDnDOperationException
 *    if the Drag and Drop
 *    system is unable to initiate a drag operation, or if the user
 *    attempts to start a drag while an existing drag operation
 *    is still executing
 */

public void startDrag(DragGestureEvent   trigger,
                      Cursor             dragCursor,
                      Image              dragImage,
                      Point              imageOffset,
                      Transferable       transferable,
                      DragSourceListener dsl,
                      FlavorMap          flavorMap) throws InvalidDnDOperationException {

    SunDragSourceContextPeer.setDragDropInProgress(true);

    try {
        if (flavorMap != null) this.flavorMap = flavorMap;

        DragSourceContextPeer dscp = Toolkit.getDefaultToolkit().createDragSourceContextPeer(trigger);

        DragSourceContext     dsc = createDragSourceContext(dscp,
                                                            trigger,
                                                            dragCursor,
                                                            dragImage,
                                                            imageOffset,
                                                            transferable,
                                                            dsl
                                                            );

        if (dsc == null) {
            throw new InvalidDnDOperationException();
        }

        dscp.startDrag(dsc, dsc.getCursor(), dragImage, imageOffset); // may throw
    } catch (RuntimeException e) {
        SunDragSourceContextPeer.setDragDropInProgress(false);
        throw e;
    }
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
@Override
public DragSourceContextPeer createDragSourceContextPeer(
        DragGestureEvent dge) throws InvalidDnDOperationException {
    final LightweightFrame f = SunToolkit.getLightweightFrame(dge.getComponent());
    if (f != null) {
        return f.createDragSourceContextPeer(dge);
    }

    return CDragSourceContextPeer.createDragSourceContextPeer(dge);
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
/**
 * create the peer for a DragSourceContext
 */

@Override
public DragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException {
    final LightweightFrame f = SunToolkit.getLightweightFrame(dge.getComponent());
    if (f != null) {
        return f.createDragSourceContextPeer(dge);
    }

    return WDragSourceContextPeer.createDragSourceContextPeer(dge);
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
public DragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException {
    final LightweightFrame f = SunToolkit.getLightweightFrame(dge.getComponent());
    if (f != null) {
        return f.createDragSourceContextPeer(dge);
    }

    return XDragSourceContextPeer.createDragSourceContextPeer(dge);
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
@Override
public DragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException {
    final LightweightFrame f = SunToolkit.getLightweightFrame(dge.getComponent());
    if (f != null) {
        return f.createDragSourceContextPeer(dge);
    }

    return XDragSourceContextPeer.createDragSourceContextPeer(dge);
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
/**
 * Initializes a drag source context.
 *
 * @exception IllegalArgumentException If Component or DragSource of trigger
 * are null, the drag action for the trigger event is DnDConstants.ACTION_NONE
 * or if the source actions for the DragGestureRecognizer associated with the
 * trigger event are equal to DnDConstants.ACTION_NONE.
 * @exception NullPointerException If peer, trans or trigger is null or if the
 * image is not null but the offset is.
 */
public DragSourceContext (DragSourceContextPeer peer,
                          DragGestureEvent trigger, Cursor cursor,
                          Image image, Point offset, Transferable trans,
                          DragSourceListener dsl)
{
  if (peer == null
      || trigger == null || trans == null
      || (image != null && offset == null))
    throw new NullPointerException ();

  if (trigger.getComponent () == null
      || trigger.getDragSource () == null
      || trigger.getDragAction () == DnDConstants.ACTION_NONE
      || trigger.getSourceAsDragGestureRecognizer ()
            .getSourceActions () == DnDConstants.ACTION_NONE)
    throw new IllegalArgumentException ();

  this.peer = peer;
  this.trigger = trigger;
  this.cursor = cursor;
  this.image = image;
  this.offset = offset;
  this.transferable = trans;
  this.dragSourceListener = dsl;
  this.sourceActions = trigger.getSourceAsDragGestureRecognizer().getSourceActions();

  setCursor(cursor);
  updateCurrentCursor(trigger.getDragAction(), sourceActions, DEFAULT);
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
/**
 * Creates the DragSourceContext to handle this drag.
 *
 * @exception IllegalArgumentException
 * @exception NullPointerException If dscp, dgl, dragImage or t is null.
 */
protected DragSourceContext
  createDragSourceContext(DragSourceContextPeer peer, DragGestureEvent dge,
                          Cursor cursor, Image image, Point offset,
                          Transferable t, DragSourceListener dsl)
{
  return new DragSourceContext(peer, dge, cursor, image, offset, t, dsl);
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
/**
 * Initializes a drag source context.
 *
 * @exception IllegalArgumentException If Component or DragSource of trigger
 * are null, the drag action for the trigger event is DnDConstants.ACTION_NONE
 * or if the source actions for the DragGestureRecognizer associated with the
 * trigger event are equal to DnDConstants.ACTION_NONE.
 * @exception NullPointerException If peer, trans or trigger is null or if the
 * image is not null but the offset is. 
 */
public DragSourceContext (DragSourceContextPeer peer,
                          DragGestureEvent trigger, Cursor cursor,
                          Image image, Point offset, Transferable trans,
                          DragSourceListener dsl)
{    
  if (peer == null
      || trigger == null || trans == null
      || (image != null && offset == null))
    throw new NullPointerException ();

  if (trigger.getComponent () == null
      || trigger.getDragSource () == null
      || trigger.getDragAction () == DnDConstants.ACTION_NONE
      || trigger.getSourceAsDragGestureRecognizer ()
            .getSourceActions () == DnDConstants.ACTION_NONE)
    throw new IllegalArgumentException ();

  this.peer = peer;
  this.trigger = trigger;
  this.cursor = cursor;
  this.image = image;
  this.offset = offset;
  this.transferable = trans;
  this.dragSourceListener = dsl;
  this.sourceActions = trigger.getSourceAsDragGestureRecognizer().getSourceActions();
  
  setCursor(cursor);
  updateCurrentCursor(trigger.getDragAction(), sourceActions, DEFAULT);
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
/**
 * Creates the DragSourceContext to handle this drag.
 *
 * @exception IllegalArgumentException 
 * @exception NullPointerException If dscp, dgl, dragImage or t is null.
 */
protected DragSourceContext
  createDragSourceContext(DragSourceContextPeer peer, DragGestureEvent dge,
                          Cursor cursor, Image image, Point offset,
                          Transferable t, DragSourceListener dsl)
{
  return new DragSourceContext(peer, dge, cursor, image, offset, t, dsl);
}
 

import java.awt.dnd.peer.DragSourceContextPeer; //导入依赖的package包/类
/**
 * Start a drag, given the <code>DragGestureEvent</code> 
 * that initiated the drag, the initial 
 * <code>Cursor</code> to use,
 * the <code>Image</code> to drag, 
 * the offset of the <code>Image</code> origin 
 * from the hotspot of the <code>Cursor</code> at 
 * the instant of the trigger,
 * the <code>Transferable</code> subject data 
 * of the drag, the <code>DragSourceListener</code>, 
 * and the <code>FlavorMap</code>. 
 * <P>
 * @param trigger	     the <code>DragGestureEvent</code> that initiated the drag
 * @param dragCursor     the initial <code>Cursor</code> or <code>null</code> for defaults
 * @param dragImage	     the image to drag or null,
 * @param imageOffset    the offset of the <code>Image</code> origin from the hotspot
 *			     of the <code>Cursor</code> at the instant of the trigger
 * @param transferable   the subject data of the drag
 * @param dsl	     the <code>DragSourceListener</code>
 * @param flavorMap	     the <code>FlavorMap</code> to use, or <code>null</code>
 * <P>
 * @throws <code>java.awt.dnd.InvalidDnDOperationException</code> 
 *    if the Drag and Drop
 *    system is unable to initiate a drag operation, or if the user
 *    attempts to start a drag while an existing drag operation 
 *    is still executing
 */

public void startDrag(DragGestureEvent   trigger,
 Cursor	     dragCursor,
 Image		     dragImage,
 Point		     imageOffset,
 Transferable	     transferable,
 DragSourceListener dsl,
 FlavorMap	     flavorMap) throws InvalidDnDOperationException {

    SunDragSourceContextPeer.setDragDropInProgress(true);

    try {
        if (flavorMap != null) this.flavorMap = flavorMap;

        DragSourceContextPeer dscp = Toolkit.getDefaultToolkit().createDragSourceContextPeer(trigger);

        DragSourceContext     dsc = createDragSourceContext(dscp,
                                                            trigger,
                                                            dragCursor,
                                                            dragImage,
                                                            imageOffset,
                                                            transferable,
                                                            dsl
                                                            );
        
        if (dsc == null) {
            throw new InvalidDnDOperationException();
        }
			    
        dscp.startDrag(dsc, dsc.getCursor(), dragImage, imageOffset); // may throw
    } catch (RuntimeException e) {
        SunDragSourceContextPeer.setDragDropInProgress(false);
        throw e;
    }
}