org.eclipse.swt.dnd.DragSource Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2017 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Lars Vogel - Bug 497807
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.cocoa.*;
import org.eclipse.swt.widgets.*;
/**
*
* DragSource defines the source object for a drag and drop transfer.
*
* IMPORTANT: This class is not intended to be subclassed.
*
* A drag source is the object which originates a drag and drop operation. For the specified widget,
* it defines the type of data that is available for dragging and the set of operations that can
* be performed on that data. The operations can be any bit-wise combination of DND.MOVE, DND.COPY or
* DND.LINK. The type of data that can be transferred is specified by subclasses of Transfer such as
* TextTransfer or FileTransfer. The type of data transferred can be a predefined system type or it
* can be a type defined by the application. For instructions on how to define your own transfer type,
* refer to ByteArrayTransfer.
*
* You may have several DragSources in an application but you can only have one DragSource
* per Control. Data dragged from this DragSource can be dropped on a site within this application
* or it can be dropped on another application such as an external Text editor.
*
* The application supplies the content of the data being transferred by implementing the
* DragSourceListener and associating it with the DragSource via DragSource#addDragListener.
*
* When a successful move operation occurs, the application is required to take the appropriate
* action to remove the data from its display and remove any associated operating system resources or
* internal references. Typically in a move operation, the drop target makes a copy of the data
* and the drag source deletes the original. However, sometimes copying the data can take a long
* time (such as copying a large file). Therefore, on some platforms, the drop target may actually
* move the data in the operating system rather than make a copy. This is usually only done in
* file transfers. In this case, the drag source is informed in the DragEnd event that a
* DROP_TARGET_MOVE was performed. It is the responsibility of the drag source at this point to clean
* up its displayed information. No action needs to be taken on the operating system resources.
*
* The following example shows a Label widget that allows text to be dragged from it.
*
*
* // Enable a label as a Drag Source
* Label label = new Label(shell, SWT.NONE);
* // This example will allow text to be dragged
* Transfer[] types = new Transfer[] {TextTransfer.getInstance()};
* // This example will allow the text to be copied or moved to the drop target
* int operations = DND.DROP_MOVE | DND.DROP_COPY;
*
* DragSource source = new DragSource(label, operations);
* source.setTransfer(types);
* source.addDragListener(new DragSourceListener() {
* public void dragStart(DragSourceEvent e) {
* // Only start the drag if there is actually text in the
* // label - this text will be what is dropped on the target.
* if (label.getText().length() == 0) {
* event.doit = false;
* }
* };
* public void dragSetData(DragSourceEvent event) {
* // A drop has been performed, so provide the data of the
* // requested type.
* // (Checking the type of the requested data is only
* // necessary if the drag source supports more than
* // one data type but is shown here as an example).
* if (TextTransfer.getInstance().isSupportedType(event.dataType)){
* event.data = label.getText();
* }
* }
* public void dragFinished(DragSourceEvent event) {
* // A Move operation has been performed so remove the data
* // from the source
* if (event.detail == DND.DROP_MOVE)
* label.setText("");
* }
* });
*
* - Styles
- DND.DROP_NONE, DND.DROP_COPY, DND.DROP_MOVE, DND.DROP_LINK
* - Events
- DND.DragStart, DND.DragSetData, DND.DragEnd
*
*
* @see Drag and Drop snippets
* @see SWT Example: DNDExample
* @see Sample code and further information
* @noextend This class is not intended to be subclassed by clients.
*/
@SuppressWarnings({"rawtypes"})
public class DragSource extends Widget {
// TODO: These should either move out of Display or be accessible to this class.
static byte[] types = {'*','\0'};
static int size = C.PTR_SIZEOF, align = C.PTR_SIZEOF == 4 ? 2 : 3;
static Callback dragSource2Args, dragSource3Args, dragSource4Args, dragSource5Args, dragSource6Args;
static final byte[] SWT_OBJECT = {'S', 'W', 'T', '_', 'O', 'B', 'J', 'E', 'C', 'T', '\0'};
static long /*int*/ proc2 = 0, proc3 = 0, proc4 = 0, proc5 = 0, proc6 = 0;
String paths[];
boolean exist[];
static {
String className = "SWTDragSourceDelegate";
Class clazz = DragSource.class;
dragSource2Args = new Callback(clazz, "dragSourceProc", 2);
proc2 = dragSource2Args.getAddress();
if (proc2 == 0) SWT.error (SWT.ERROR_NO_MORE_CALLBACKS);
dragSource3Args = new Callback(clazz, "dragSourceProc", 3);
proc3 = dragSource3Args.getAddress();
if (proc3 == 0) SWT.error (SWT.ERROR_NO_MORE_CALLBACKS);
dragSource4Args = new Callback(clazz, "dragSourceProc", 4);
proc4 = dragSource4Args.getAddress();
if (proc4 == 0) SWT.error (SWT.ERROR_NO_MORE_CALLBACKS);
dragSource5Args = new Callback(clazz, "dragSourceProc", 5);
proc5 = dragSource5Args.getAddress();
if (proc5 == 0) SWT.error (SWT.ERROR_NO_MORE_CALLBACKS);
dragSource6Args = new Callback(clazz, "dragSourceProc", 6);
proc6 = dragSource6Args.getAddress();
if (proc6 == 0) SWT.error (SWT.ERROR_NO_MORE_CALLBACKS);
long /*int*/ cls = OS.objc_allocateClassPair(OS.class_NSObject, className, 0);
OS.class_addIvar(cls, SWT_OBJECT, size, (byte)align, types);
long /*int*/ draggedImage_endedAt_operationProc = OS.CALLBACK_draggedImage_endedAt_operation_(proc5);
// Add the NSDraggingSource callbacks
OS.class_addMethod(cls, OS.sel_draggingSourceOperationMaskForLocal_, proc3, "@:I");
OS.class_addMethod(cls, OS.sel_draggedImage_beganAt_, proc4, "@:@{NSPoint=ff}");
OS.class_addMethod(cls, OS.sel_draggedImage_endedAt_operation_, draggedImage_endedAt_operationProc, "@:@{NSPoint=ff}I");
OS.class_addMethod(cls, OS.sel_ignoreModifierKeysWhileDragging, proc3, "@:");
// Add the NSPasteboard delegate callback
OS.class_addMethod(cls, OS.sel_pasteboard_provideDataForType_, proc4, "@:@@");
OS.objc_registerClassPair(cls);
}
// info for registering as a drag source
Control control;
Listener controlListener;
Transfer[] transferAgents = new Transfer[0];
DragSourceEffect dragEffect;
Image dragImageFromListener;
private int dragOperations;
SWTDragSourceDelegate dragSourceDelegate;
static final String DEFAULT_DRAG_SOURCE_EFFECT = "DEFAULT_DRAG_SOURCE_EFFECT"; //$NON-NLS-1$
private long /*int*/ delegateJniRef;
private Point dragOffset;
/**
* Creates a new DragSource to handle dragging from the specified Control.
* Creating an instance of a DragSource may cause system resources to be allocated depending on the platform.
* It is therefore mandatory that the DragSource instance be disposed when no longer required.
*
* @param control the Control that the user clicks on to initiate the drag
* @param style the bitwise OR'ing of allowed operations; this may be a combination of any of
* DND.DROP_NONE, DND.DROP_COPY, DND.DROP_MOVE, DND.DROP_LINK
*
* @exception SWTException
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
* - ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
*
* @exception SWTError
* - ERROR_CANNOT_INIT_DRAG - unable to initiate drag source; this will occur if more than one
* drag source is created for a control or if the operating system will not allow the creation
* of the drag source
*
*
* NOTE: ERROR_CANNOT_INIT_DRAG should be an SWTException, since it is a
* recoverable error, but can not be changed due to backward compatibility.
*
* @see Widget#dispose
* @see DragSource#checkSubclass
* @see DND#DROP_NONE
* @see DND#DROP_COPY
* @see DND#DROP_MOVE
* @see DND#DROP_LINK
*/
public DragSource(Control control, int style) {
super (control, checkStyle(style));
this.control = control;
if (control.getData(DND.DRAG_SOURCE_KEY) != null) {
DND.error(DND.ERROR_CANNOT_INIT_DRAG);
}
control.setData(DND.DRAG_SOURCE_KEY, this);
controlListener = event -> {
if (event.type == SWT.Dispose) {
if (!DragSource.this.isDisposed()) {
DragSource.this.dispose();
}
}
if (event.type == SWT.DragDetect) {
if (!DragSource.this.isDisposed()) {
if (event.widget instanceof Table || event.widget instanceof Tree) {
DragSource.this.dragOutlineViewStart(event);
} else {
DragSource.this.drag(event);
}
}
}
};
control.addListener (SWT.Dispose, controlListener);
control.addListener (SWT.DragDetect, controlListener);
this.addListener(SWT.Dispose, e -> onDispose());
Object effect = control.getData(DEFAULT_DRAG_SOURCE_EFFECT);
if (effect instanceof DragSourceEffect) {
dragEffect = (DragSourceEffect) effect;
} else if (control instanceof Tree) {
dragEffect = new TreeDragSourceEffect((Tree) control);
} else if (control instanceof Table) {
dragEffect = new TableDragSourceEffect((Table) control);
}
delegateJniRef = OS.NewGlobalRef(this);
if (delegateJniRef == 0) SWT.error(SWT.ERROR_NO_HANDLES);
// The dragSourceDelegate implements the pasteboard callback to provide the dragged data, so we always need
// to create it. NSDraggingSource methods are ignored in the table and tree case.
dragSourceDelegate = (SWTDragSourceDelegate)new SWTDragSourceDelegate().alloc().init();
OS.object_setInstanceVariable(dragSourceDelegate.id, SWT_OBJECT, delegateJniRef);
// Tables and trees already implement dragging, so we need to override their drag methods instead of creating a dragging source.
if (control instanceof Tree || control instanceof Table) {
long /*int*/ cls = OS.object_getClass(control.view.id);
if (cls == 0) {
DND.error(DND.ERROR_CANNOT_INIT_DRAG);
}
// If we already added it, no need to do it again.
long /*int*/ procPtr = OS.class_getMethodImplementation(cls, OS.sel_draggingSourceOperationMaskForLocal_);
if (procPtr == proc3) return;
long /*int*/ draggedImage_endedAt_operationProc = OS.CALLBACK_draggedImage_endedAt_operation_(proc5);
// Add the NSDraggingSource overrides.
OS.class_addMethod(cls, OS.sel_draggingSourceOperationMaskForLocal_, proc3, "@:I");
OS.class_addMethod(cls, OS.sel_draggedImage_beganAt_, proc4, "@:@{NSPoint=ff}");
OS.class_addMethod(cls, OS.sel_draggedImage_endedAt_operation_, draggedImage_endedAt_operationProc, "@:@{NSPoint=ff}I");
OS.class_addMethod(cls, OS.sel_ignoreModifierKeysWhileDragging, proc3, "@:");
// Override to return the drag effect's image.
OS.class_addMethod(cls, OS.sel_dragImageForRowsWithIndexes_tableColumns_event_offset_, proc6, "@:@@@^NSPoint");
}
}
/**
* Adds the listener to the collection of listeners who will
* be notified when a drag and drop operation is in progress, by sending
* it one of the messages defined in the DragSourceListener
* interface.
*
*
* dragStart is called when the user has begun the actions required to drag the widget.
* This event gives the application the chance to decide if a drag should be started.
* dragSetData is called when the data is required from the drag source.
* dragFinished is called when the drop has successfully completed (mouse up
* over a valid target) or has been terminated (such as hitting the ESC key). Perform cleanup
* such as removing data from the source side on a successful move operation.
*
*
* @param listener the listener which should be notified
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the listener is null
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see DragSourceListener
* @see #getDragListeners
* @see #removeDragListener
* @see DragSourceEvent
*/
public void addDragListener(DragSourceListener listener) {
if (listener == null) DND.error (SWT.ERROR_NULL_ARGUMENT);
DNDListener typedListener = new DNDListener (listener);
typedListener.dndWidget = this;
addListener (DND.DragStart, typedListener);
addListener (DND.DragSetData, typedListener);
addListener (DND.DragEnd, typedListener);
}
void dndCallSuper(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, NSPoint arg1, long /*int*/ arg2) {
objc_super super_struct = new objc_super();
super_struct.receiver = id;
super_struct.super_class = OS.objc_msgSend(id, OS.sel_superclass);
OS.objc_msgSendSuper(super_struct, sel, arg0, arg1, arg2);
}
void dndCallSuper(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, long /*int*/ arg1) {
objc_super super_struct = new objc_super();
super_struct.receiver = id;
super_struct.super_class = OS.objc_msgSend(id, OS.sel_superclass);
OS.objc_msgSendSuper(super_struct, sel, arg0, arg1);
}
long /*int*/ dndCallSuperObject(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, long /*int*/ arg1, long /*int*/ arg2, long /*int*/ arg3) {
objc_super super_struct = new objc_super();
super_struct.receiver = id;
super_struct.super_class = OS.objc_msgSend(id, OS.sel_superclass);
return OS.objc_msgSendSuper(super_struct, sel, arg0, arg1, arg2, arg3);
}
@Override
protected void checkSubclass () {
String name = getClass().getName ();
String validName = DragSource.class.getName();
if (!validName.equals(name)) {
DND.error (SWT.ERROR_INVALID_SUBCLASS);
}
}
static int checkStyle (int style) {
if (style == SWT.NONE) return DND.DROP_MOVE;
return style;
}
void drag(Event dragDetectEvent) {
DNDEvent event = startDrag(dragDetectEvent);
if (event == null) return;
// Start the drag here from the Control's view.
NSEvent currEvent = NSApplication.sharedApplication().currentEvent();
NSPoint pt = currEvent.locationInWindow();
NSPoint viewPt = control.view.convertPoint_fromView_(pt, null);
// Get the image for the drag. The drag should happen from the middle of the image.
NSImage dragImage = null;
Image defaultDragImage = null;
try {
Image image = event.image;
// If no image was provided, just create a trivial image. dragImage requires a non-null image.
if (image == null) {
int width = 20, height = 20;
Image newDragImage = new Image(Display.getCurrent(), width, height);
GC imageGC = new GC(newDragImage);
Color grayColor = new Color(Display.getCurrent(), 50, 50, 50);
imageGC.setForeground(grayColor);
imageGC.drawRectangle(0, 0, 19, 19);
imageGC.dispose();
ImageData newImageData = newDragImage.getImageData();
newImageData.alpha = (int)(255 * .4);
defaultDragImage = new Image(Display.getCurrent(), newImageData);
newDragImage.dispose();
grayColor.dispose();
image = defaultDragImage;
event.offsetX = width / 2;
event.offsetY = height / 2;
}
dragImage = image.handle;
NSSize imageSize = dragImage.size();
viewPt.x -= event.offsetX;
if (control.view.isFlipped())
viewPt.y += imageSize.height - event.offsetY;
else
viewPt.y -= event.offsetY;
// The third argument to dragImage is ignored as of 10.4.
NSSize ignored = new NSSize();
control.view.dragImage(dragImage, viewPt, ignored, NSApplication.sharedApplication().currentEvent(), NSPasteboard.pasteboardWithName(OS.NSDragPboard), dragSourceDelegate, true);
} finally {
if (defaultDragImage != null) defaultDragImage.dispose();
}
}
void dragOutlineViewStart(Event dragDetectEvent) {
DNDEvent event = startDrag(dragDetectEvent);
if (event == null) return;
// Save off the custom image, if any.
dragImageFromListener = event.image;
// Save the computed offset for the image. This needs to be passed back in dragImageForRowsWithIndexes
// so the proxy image originates from the selection and not centered under the mouse.
dragOffset = new Point(event.offsetX, event.offsetY);
}
void draggedImage_beganAt(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, long /*int*/ arg1) {
if (new NSObject(id).isKindOfClass(OS.class_NSTableView)) {
dndCallSuper(id, sel, arg0, arg1);
}
}
void draggedImage_endedAt_operation(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, NSPoint arg1, long /*int*/ arg2) {
int swtOperation = osOpToOp(arg2);
if (paths != null) {
NSFileManager fileManager = NSFileManager.defaultManager();
for (int i = 0; i < paths.length; i++) {
if (paths[i] != null && exist[i]) {
if (!fileManager.fileExistsAtPath(NSString.stringWith(paths[i]))) {
swtOperation &= ~DND.DROP_MOVE;
swtOperation |= DND.DROP_TARGET_MOVE;
}
}
}
paths = null;
exist = null;
}
OS.objc_msgSend(id, OS.sel_retain);
try {
Event event = new DNDEvent();
event.widget = this;
event.time = (int)System.currentTimeMillis();
event.doit = swtOperation != DND.DROP_NONE;
event.detail = swtOperation;
notifyListeners(DND.DragEnd, event);
dragImageFromListener = null;
if (new NSObject(id).isKindOfClass(OS.class_NSTableView)) {
dndCallSuper(id, sel, arg0, arg1, arg2);
}
} finally {
OS.objc_msgSend(id, OS.sel_release);
}
}
long /*int*/ dragImageForRowsWithIndexes_tableColumns_event_offset(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, long /*int*/ arg1, long /*int*/ arg2, long /*int*/ arg3) {
if (dragImageFromListener != null) {
NSPoint point = new NSPoint();
point.x = dragOffset.x;
point.y = dragOffset.y;
OS.memmove(arg3, point, NSPoint.sizeof);
return dragImageFromListener.handle.id;
} else {
return dndCallSuperObject(id, sel, arg0, arg1, arg2, arg3);
}
}
/**
* Cocoa NSDraggingSource implementations
*/
long /*int*/ draggingSourceOperationMaskForLocal(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0) {
// Drag operations are same for local or remote drags.
return dragOperations;
}
static long /*int*/ dragSourceProc(long /*int*/ id, long /*int*/ sel) {
Display display = Display.findDisplay(Thread.currentThread());
if (display == null || display.isDisposed()) return 0;
Widget widget = display.findWidget(id);
if (widget == null) return 0;
DragSource ds = null;
if (widget instanceof DragSource) {
ds = (DragSource)widget;
} else {
ds = (DragSource)widget.getData(DND.DRAG_SOURCE_KEY);
}
if (ds == null) return 0;
if (sel == OS.sel_ignoreModifierKeysWhileDragging) {
return (ds.ignoreModifierKeysWhileDragging(id, sel) ? 1 : 0);
}
return 0;
}
static long /*int*/ dragSourceProc(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0) {
Display display = Display.findDisplay(Thread.currentThread());
if (display == null || display.isDisposed()) return 0;
Widget widget = display.findWidget(id);
if (widget == null) return 0;
DragSource ds = null;
if (widget instanceof DragSource) {
ds = (DragSource)widget;
} else {
ds = (DragSource)widget.getData(DND.DRAG_SOURCE_KEY);
}
if (ds == null) return 0;
if (sel == OS.sel_draggingSourceOperationMaskForLocal_) {
return ds.draggingSourceOperationMaskForLocal(id, sel, arg0);
}
return 0;
}
static long /*int*/ dragSourceProc(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, long /*int*/ arg1) {
Display display = Display.findDisplay(Thread.currentThread());
if (display == null || display.isDisposed()) return 0;
Widget widget = display.findWidget(id);
if (widget == null) return 0;
DragSource ds = null;
if (widget instanceof DragSource) {
ds = (DragSource)widget;
} else {
ds = (DragSource)widget.getData(DND.DRAG_SOURCE_KEY);
}
if (ds == null) return 0;
if (sel == OS.sel_draggedImage_beganAt_) {
ds.draggedImage_beganAt(id, sel, arg0, arg1);
} else if (sel == OS.sel_pasteboard_provideDataForType_) {
ds.pasteboard_provideDataForType(id, sel, arg0, arg1);
}
return 0;
}
static long /*int*/ dragSourceProc(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, long /*int*/ arg1, long /*int*/ arg2) {
Display display = Display.findDisplay(Thread.currentThread());
if (display == null || display.isDisposed()) return 0;
Widget widget = display.findWidget(id);
if (widget == null) return 0;
DragSource ds = null;
if (widget instanceof DragSource) {
ds = (DragSource)widget;
} else {
ds = (DragSource)widget.getData(DND.DRAG_SOURCE_KEY);
}
if (ds == null) return 0;
if (sel == OS.sel_draggedImage_endedAt_operation_) {
NSPoint point = new NSPoint();
OS.memmove(point, arg1, NSPoint.sizeof);
ds.draggedImage_endedAt_operation(id, sel, arg0, point, arg2);
}
return 0;
}
static long /*int*/ dragSourceProc(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, long /*int*/ arg1, long /*int*/ arg2, long /*int*/ arg3) {
Display display = Display.findDisplay(Thread.currentThread());
if (display == null || display.isDisposed()) return 0;
Widget widget = display.findWidget(id);
if (widget == null) return 0;
DragSource ds = null;
if (widget instanceof DragSource) {
ds = (DragSource)widget;
} else {
ds = (DragSource)widget.getData(DND.DRAG_SOURCE_KEY);
}
if (ds == null) return 0;
if (sel == OS.sel_dragImageForRowsWithIndexes_tableColumns_event_offset_) {
return ds.dragImageForRowsWithIndexes_tableColumns_event_offset(id, sel, arg0, arg1, arg2, arg3);
}
return 0;
}
/**
* Returns the Control which is registered for this DragSource. This is the control that the
* user clicks in to initiate dragging.
*
* @return the Control which is registered for this DragSource
*/
public Control getControl () {
return control;
}
/**
* Returns an array of listeners who will be notified when a drag and drop
* operation is in progress, by sending it one of the messages defined in
* the DragSourceListener interface.
*
* @return the listeners who will be notified when a drag and drop
* operation is in progress
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see DragSourceListener
* @see #addDragListener
* @see #removeDragListener
* @see DragSourceEvent
*
* @since 3.4
*/
public DragSourceListener[] getDragListeners() {
Listener[] listeners = getListeners(DND.DragStart);
int length = listeners.length;
DragSourceListener[] dragListeners = new DragSourceListener[length];
int count = 0;
for (int i = 0; i < length; i++) {
Listener listener = listeners[i];
if (listener instanceof DNDListener) {
dragListeners[count] = (DragSourceListener) ((DNDListener) listener).getEventListener();
count++;
}
}
if (count == length) return dragListeners;
DragSourceListener[] result = new DragSourceListener[count];
System.arraycopy(dragListeners, 0, result, 0, count);
return result;
}
/**
* Returns the drag effect that is registered for this DragSource. This drag
* effect will be used during a drag and drop operation.
*
* @return the drag effect that is registered for this DragSource
*
* @since 3.3
*/
public DragSourceEffect getDragSourceEffect() {
return dragEffect;
}
/**
* Returns the list of data types that can be transferred by this DragSource.
*
* @return the list of data types that can be transferred by this DragSource
*/
public Transfer[] getTransfer(){
return transferAgents;
}
/**
* We always want the modifier keys to potentially update the drag.
*/
boolean ignoreModifierKeysWhileDragging(long /*int*/ id, long /*int*/ sel) {
return false;
}
void onDispose() {
if (control == null)
return;
if (controlListener != null) {
control.removeListener(SWT.Dispose, controlListener);
control.removeListener(SWT.DragDetect, controlListener);
}
controlListener = null;
control.setData(DND.DRAG_SOURCE_KEY, null);
control = null;
transferAgents = null;
if (delegateJniRef != 0) OS.DeleteGlobalRef(delegateJniRef);
delegateJniRef = 0;
if (dragSourceDelegate != null) {
OS.object_setInstanceVariable(dragSourceDelegate.id, SWT_OBJECT, 0);
dragSourceDelegate.release();
}
}
int opToOsOp(int operation) {
int osOperation = 0;
if ((operation & DND.DROP_COPY) != 0){
osOperation |= OS.NSDragOperationCopy;
}
if ((operation & DND.DROP_LINK) != 0) {
osOperation |= OS.NSDragOperationLink;
}
if ((operation & DND.DROP_MOVE) != 0) {
osOperation |= OS.NSDragOperationMove;
}
if ((operation & DND.DROP_TARGET_MOVE) != 0) {
osOperation |= OS.NSDragOperationDelete;
}
return osOperation;
}
int osOpToOp(long /*int*/ osOperation){
int operation = 0;
if ((osOperation & OS.NSDragOperationCopy) != 0){
operation |= DND.DROP_COPY;
}
if ((osOperation & OS.NSDragOperationLink) != 0) {
operation |= DND.DROP_LINK;
}
if ((osOperation & OS.NSDragOperationDelete) != 0) {
operation |= DND.DROP_TARGET_MOVE;
}
if ((osOperation & OS.NSDragOperationMove) != 0) {
operation |= DND.DROP_MOVE;
}
if (osOperation == OS.NSDragOperationEvery) {
operation = DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK;
}
return operation;
}
void pasteboard_provideDataForType(long /*int*/ id, long /*int*/ sel, long /*int*/ arg0, long /*int*/ arg1) {
NSPasteboard pasteboard = new NSPasteboard(arg0);
NSString dataType = new NSString(arg1);
if (pasteboard == null || dataType == null) return;
TransferData transferData = new TransferData();
transferData.type = Transfer.registerType(dataType.getString());
DNDEvent event = new DNDEvent();
event.widget = this;
event.time = (int)System.currentTimeMillis();
event.dataType = transferData;
notifyListeners(DND.DragSetData, event);
if (!event.doit) return;
Transfer transfer = null;
for (int i = 0; i < transferAgents.length; i++) {
Transfer transferAgent = transferAgents[i];
if (transferAgent != null && transferAgent.isSupportedType(transferData)) {
transfer = transferAgent;
break;
}
}
if (transfer == null) return;
transfer.javaToNative(event.data, transferData);
if (transferData.data == null) return;
NSObject tdata = transferData.data;
if (dataType.isEqual(OS.NSPasteboardTypeString) ||
dataType.isEqual(OS.NSPasteboardTypeHTML) ||
dataType.isEqual(OS.NSPasteboardTypeRTF)) {
pasteboard.setString((NSString) tdata, dataType);
} else if (dataType.isEqual(OS.NSURLPboardType) || dataType.isEqual(OS.kUTTypeURL)) {
NSURL url = (NSURL) tdata;
pasteboard.writeObjects(NSArray.arrayWithObject(url));
} else if (dataType.isEqual(OS.NSFilenamesPboardType) || dataType.isEqual(OS.kUTTypeFileURL)) {
NSArray array = (NSArray) transferData.data;
int count = (int) /*64*/ array.count();
paths = new String[count];
exist = new boolean[count];
NSFileManager fileManager = NSFileManager.defaultManager();
for (int i = 0; i < count; i++) {
NSString filePath = new NSString(array.objectAtIndex(i));
paths[i] = filePath.getString();
exist[i] = fileManager.fileExistsAtPath(filePath);
}
pasteboard.setPropertyList((NSArray) tdata, OS.NSFilenamesPboardType);
} else {
pasteboard.setData((NSData) tdata, dataType);
}
}
/**
* Removes the listener from the collection of listeners who will
* be notified when a drag and drop operation is in progress.
*
* @param listener the listener which should no longer be notified
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the listener is null
*
* @exception SWTException
* - ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* - ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
*
*
* @see DragSourceListener
* @see #addDragListener
* @see #getDragListeners
*/
public void removeDragListener(DragSourceListener listener) {
if (listener == null) DND.error (SWT.ERROR_NULL_ARGUMENT);
removeListener (DND.DragStart, listener);
removeListener (DND.DragSetData, listener);
removeListener (DND.DragEnd, listener);
}
/**
* Specifies the drag effect for this DragSource. This drag effect will be
* used during a drag and drop operation.
*
* @param effect the drag effect that is registered for this DragSource
*
* @since 3.3
*/
public void setDragSourceEffect(DragSourceEffect effect) {
dragEffect = effect;
}
/**
* Specifies the list of data types that can be transferred by this DragSource.
* The application must be able to provide data to match each of these types when
* a successful drop has occurred.
*
* @param transferAgents a list of Transfer objects which define the types of data that can be
* dragged from this source
*/
public void setTransfer(Transfer... transferAgents){
this.transferAgents = transferAgents;
}
DNDEvent startDrag(Event dragEvent) {
DNDEvent event = new DNDEvent();
event.widget = this;
event.x = dragEvent.x;
event.y = dragEvent.y;
event.time = dragEvent.time;
event.doit = true;
notifyListeners(DND.DragStart, event);
if (!event.doit || transferAgents == null || transferAgents.length == 0) return null;
NSPasteboard dragBoard = NSPasteboard.pasteboardWithName(OS.NSDragPboard);
NSMutableArray nativeTypeArray = NSMutableArray.arrayWithCapacity(10);
for (int i = 0; i < transferAgents.length; i++) {
Transfer transfer = transferAgents[i];
if (transfer != null) {
String[] typeNames = transfer.getTypeNames();
for (int j = 0; j < typeNames.length; j++) {
nativeTypeArray.addObject(NSString.stringWith(typeNames[j]));
}
}
}
dragBoard.declareTypes(nativeTypeArray, dragSourceDelegate);
// Save off the drag operations -- AppKit will call back to us to request them during the drag.
dragOperations = opToOsOp(getStyle());
return event;
}
}