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Eclipse Platform
Release 3.0

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org.eclipse.swt.dnd
Class DND

java.lang.Object
  org.eclipse.swt.dnd.DND

public class DND

extends Object

Class DND contains all the constants used in defining a DragSource or a DropTarget.

Field Summary

static int	DragEnd DragSource Event: the drop has successfully completed or has been terminated (such as hitting the ESC key); perform cleanup such as removing data on a move operation (value is 2000).
static int	DragEnter DropTarget Event: the cursor has entered the drop target boundaries (value is 2002).
static int	DragLeave DropTarget Event: the cursor has left the drop target boundaries OR the drop operation has been cancelled (such as by hitting ECS) OR the drop is about to happen (user has released the mous ebutotn over this target) (value is 2003).
static int	DragOperationChanged DropTarget Event: the operation being performed has changed usually due to the user changing the selected modifier keys while dragging (value is 2005).
static int	DragOver DropTarget Event: the cursor is over the drop target (value is 2004).
static int	DragSetData DragSource Event: the data to be dropped is required from the drag source (value is 2001).
static int	DragStart DragSource Event: a drag is about to begin (value is 2008).
static int	Drop DropTarget Event: the data has been dropped (value is 2006).
static int	DROP_COPY Drag and Drop Operation: a copy of the data in the drag source is added to the drop target (value is 1 << 0).
static int	DROP_DEFAULT Drag and Drop Operation: During a dragEnter event or a dragOperationChanged, if no modifier keys are pressed, the operation is set to DROP_DEFAULT.
static int	DROP_LINK Drag and Drop Operation: the drop target makes a link to the data in the drag source (value is 1 << 2).
static int	DROP_MOVE Drag and Drop Operation: a copy of the data is added to the drop target and the original data is removed from the drag source (value is 1 << 1).
static int	DROP_NONE Drag and Drop Operation: no drag/drop operation performed (value is 0).
static int	DROP_TARGET_MOVE Drag and Drop Operation: the drop target moves the data and the drag source removes any references to the data and updates its display.
static int	DropAccept DropTarget Event: the drop target is given a last chance to modify the drop (value is 2007).
static int	ERROR_CANNOT_INIT_DRAG Error code: drag source can not be initialized (value is 2000).
static int	ERROR_CANNOT_INIT_DROP Error code: drop target cannot be initialized (value is 2001).
static int	ERROR_CANNOT_SET_CLIPBOARD Error code: Data can not be set on system clipboard (value is 2002).
static int	FEEDBACK_EXPAND DropTarget drag under effect: The item currently under the cursor is expanded to allow the user to select a drop target from a sub item; applies to trees (value is 16).
static int	FEEDBACK_INSERT_AFTER DropTarget drag under effect:An insertion mark is shown after the item under the cursor; applies to tables and trees (value is 4).
static int	FEEDBACK_INSERT_BEFORE DropTarget drag under effect: An insertion mark is shown before the item under the cursor; applies to tables and trees (value is 2).
static int	FEEDBACK_NONE DropTarget drag under effect: No effect is shown (value is 0).
static int	FEEDBACK_SCROLL DropTarget drag under effect: The widget is scrolled up or down to allow the user to drop on items that are not currently visible; applies to tables and trees (value is 8).
static int	FEEDBACK_SELECT DropTarget drag under effect: The item under the cursor is selected; applies to tables and trees (value is 1).

Constructor Summary

DND()

Method Summary

static void	error(int code) Throws an appropriate exception based on the passed in error code.
static void	error(int code, int hresult) Throws an appropriate exception based on the passed in error code.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DROP_NONE

public static final int DROP_NONE

Drag and Drop Operation: no drag/drop operation performed (value is 0).

See Also:

Constant Field Values

DROP_COPY

public static final int DROP_COPY

Drag and Drop Operation: a copy of the data in the drag source is added to the drop target (value is 1 << 0).

See Also:

Constant Field Values

DROP_MOVE

public static final int DROP_MOVE

Drag and Drop Operation: a copy of the data is added to the drop target and the original data is removed from the drag source (value is 1 << 1).

See Also:

Constant Field Values

DROP_LINK

public static final int DROP_LINK

Drag and Drop Operation: the drop target makes a link to the data in the drag source (value is 1 << 2).

See Also:

Constant Field Values

DROP_TARGET_MOVE

public static final int DROP_TARGET_MOVE

Drag and Drop Operation: the drop target moves the data and the drag source removes any references to the data and updates its display. This is not available on all platforms and is only used when a non-SWT application is the drop target. In this case, the SWT drag source is informed in the dragFinished event that the drop target has moved the data. (value is 1 << 3).

See Also:

DragSourceListener.dragFinished(org.eclipse.swt.dnd.DragSourceEvent), Constant Field Values

DROP_DEFAULT

public static final int DROP_DEFAULT

Drag and Drop Operation: During a dragEnter event or a dragOperationChanged, if no modifier keys are pressed, the operation is set to DROP_DEFAULT. The application can choose what the default operation should be by setting a new value in the operation field. If no value is choosen, the default operation for the platform will be selected (value is 1 << 4).

Since:

2.0

See Also:

DropTargetListener.dragEnter(org.eclipse.swt.dnd.DropTargetEvent), DropTargetListener.dragOperationChanged(org.eclipse.swt.dnd.DropTargetEvent), Constant Field Values

DragEnd

public static final int DragEnd

DragSource Event: the drop has successfully completed or has been terminated (such as hitting the ESC key); perform cleanup such as removing data on a move operation (value is 2000).

See Also:

Constant Field Values

DragSetData

public static final int DragSetData

DragSource Event: the data to be dropped is required from the drag source (value is 2001).

See Also:

Constant Field Values

DragEnter

public static final int DragEnter

DropTarget Event: the cursor has entered the drop target boundaries (value is 2002).

See Also:

Constant Field Values

DragLeave

public static final int DragLeave

DropTarget Event: the cursor has left the drop target boundaries OR the drop operation has been cancelled (such as by hitting ECS) OR the drop is about to happen (user has released the mous ebutotn over this target) (value is 2003).

See Also:

Constant Field Values

DragOver

public static final int DragOver

DropTarget Event: the cursor is over the drop target (value is 2004).

See Also:

Constant Field Values

DragOperationChanged

public static final int DragOperationChanged

DropTarget Event: the operation being performed has changed usually due to the user changing the selected modifier keys while dragging (value is 2005).

See Also:

Constant Field Values

Drop

public static final int Drop

DropTarget Event: the data has been dropped (value is 2006).

See Also:

Constant Field Values

DropAccept

public static final int DropAccept

DropTarget Event: the drop target is given a last chance to modify the drop (value is 2007).

See Also:

Constant Field Values

DragStart

public static final int DragStart

DragSource Event: a drag is about to begin (value is 2008).

See Also:

Constant Field Values

FEEDBACK_NONE

public static final int FEEDBACK_NONE

DropTarget drag under effect: No effect is shown (value is 0).

See Also:

Constant Field Values

FEEDBACK_SELECT

public static final int FEEDBACK_SELECT

DropTarget drag under effect: The item under the cursor is selected; applies to tables and trees (value is 1).

See Also:

Constant Field Values

FEEDBACK_INSERT_BEFORE

public static final int FEEDBACK_INSERT_BEFORE

DropTarget drag under effect: An insertion mark is shown before the item under the cursor; applies to tables and trees (value is 2).

See Also:

Constant Field Values

FEEDBACK_INSERT_AFTER

public static final int FEEDBACK_INSERT_AFTER

DropTarget drag under effect:An insertion mark is shown after the item under the cursor; applies to tables and trees (value is 4).

See Also:

Constant Field Values

FEEDBACK_SCROLL

public static final int FEEDBACK_SCROLL

DropTarget drag under effect: The widget is scrolled up or down to allow the user to drop on items that are not currently visible; applies to tables and trees (value is 8).

See Also:

Constant Field Values

FEEDBACK_EXPAND

public static final int FEEDBACK_EXPAND

DropTarget drag under effect: The item currently under the cursor is expanded to allow the user to select a drop target from a sub item; applies to trees (value is 16).

See Also:

Constant Field Values

ERROR_CANNOT_INIT_DRAG

public static final int ERROR_CANNOT_INIT_DRAG

Error code: drag source can not be initialized (value is 2000).

See Also:

Constant Field Values

ERROR_CANNOT_INIT_DROP

public static final int ERROR_CANNOT_INIT_DROP

Error code: drop target cannot be initialized (value is 2001).

See Also:

Constant Field Values

ERROR_CANNOT_SET_CLIPBOARD

public static final int ERROR_CANNOT_SET_CLIPBOARD

Error code: Data can not be set on system clipboard (value is 2002).

See Also:

Constant Field Values

Constructor Detail

DND

public DND()

Method Detail

error

public static void error(int code)

Throws an appropriate exception based on the passed in error code.

Parameters:

code - the DND error code

error

public static void error(int code,
                         int hresult)

Throws an appropriate exception based on the passed in error code. The hresult argument should be either 0, or the platform specific error code.

In DND, errors are reported by throwing one of three exceptions:

java.lang.IllegalArgumentException

thrown whenever one of the API methods is invoked with an illegal argument

org.eclipse.swt.SWTException (extends java.lang.RuntimeException)

thrown whenever a recoverable error happens internally in SWT

org.eclipse.swt.SWTError (extends java.lang.Error)

thrown whenever a non-recoverable error happens internally in SWT

This method provides the logic which maps between error codes and one of the above exceptions.

Parameters:

code - the DND error code.

hresult - the platform specific error code.

See Also:

SWTError, SWTException, IllegalArgumentException