| /******************************************************************************* |
| * Copyright (c) 2000, 2017 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.dnd; |
| |
| import java.util.*; |
| |
| 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.*; |
| |
| /** |
| * |
| * Class <code>DropTarget</code> defines the target object for a drag and drop transfer. |
| * |
| * <p>IMPORTANT: This class is <em>not</em> intended to be subclassed.</p> |
| * |
| * <p>This class identifies the <code>Control</code> over which the user must position the cursor |
| * in order to drop the data being transferred. It also specifies what data types can be dropped on |
| * this control and what operations can be performed. You may have several DropTragets in an |
| * application but there can only be a one to one mapping between a <code>Control</code> and a <code>DropTarget</code>. |
| * The DropTarget can receive data from within the same application or from other applications |
| * (such as text dragged from a text editor like Word).</p> |
| * |
| * <pre><code> |
| * int operations = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK; |
| * Transfer[] types = new Transfer[] {TextTransfer.getInstance()}; |
| * DropTarget target = new DropTarget(label, operations); |
| * target.setTransfer(types); |
| * </code></pre> |
| * |
| * <p>The application is notified of data being dragged over this control and of when a drop occurs by |
| * implementing the interface <code>DropTargetListener</code> which uses the class |
| * <code>DropTargetEvent</code>. The application can modify the type of drag being performed |
| * on this Control at any stage of the drag by modifying the <code>event.detail</code> field or the |
| * <code>event.currentDataType</code> field. When the data is dropped, it is the responsibility of |
| * the application to copy this data for its own purposes. |
| * |
| * <pre><code> |
| * target.addDropListener (new DropTargetListener() { |
| * public void dragEnter(DropTargetEvent event) {}; |
| * public void dragOver(DropTargetEvent event) {}; |
| * public void dragLeave(DropTargetEvent event) {}; |
| * public void dragOperationChanged(DropTargetEvent event) {}; |
| * public void dropAccept(DropTargetEvent event) {} |
| * public void drop(DropTargetEvent event) { |
| * // A drop has occurred, copy over the data |
| * if (event.data == null) { // no data to copy, indicate failure in event.detail |
| * event.detail = DND.DROP_NONE; |
| * return; |
| * } |
| * label.setText ((String) event.data); // data copied to label text |
| * } |
| * }); |
| * </code></pre> |
| * |
| * <dl> |
| * <dt><b>Styles</b></dt> <dd>DND.DROP_NONE, DND.DROP_COPY, DND.DROP_MOVE, DND.DROP_LINK</dd> |
| * <dt><b>Events</b></dt> <dd>DND.DragEnter, DND.DragLeave, DND.DragOver, DND.DragOperationChanged, |
| * DND.DropAccept, DND.Drop </dd> |
| * </dl> |
| * |
| * @see <a href="http://www.eclipse.org/swt/snippets/#dnd">Drag and Drop snippets</a> |
| * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: DNDExample</a> |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| * @noextend This class is not intended to be subclassed by clients. |
| */ |
| @SuppressWarnings({"rawtypes", "unchecked"}) |
| public class DropTarget extends Widget { |
| |
| static Callback dropTarget2Args, dropTarget3Args, dropTarget6Args; |
| static long proc2Args, proc3Args, proc6Args; |
| static final String LOCK_CURSOR = "org.eclipse.swt.internal.lockCursor"; //$NON-NLS-1$ |
| |
| static { |
| Class clazz = DropTarget.class; |
| |
| dropTarget2Args = new Callback(clazz, "dropTargetProc", 2); |
| proc2Args = dropTarget2Args.getAddress(); |
| |
| dropTarget3Args = new Callback(clazz, "dropTargetProc", 3); |
| proc3Args = dropTarget3Args.getAddress(); |
| |
| dropTarget6Args = new Callback(clazz, "dropTargetProc", 6); |
| proc6Args = dropTarget6Args.getAddress(); |
| } |
| |
| static boolean dropNotAllowed = false; |
| |
| Control control; |
| Listener controlListener; |
| Transfer[] transferAgents = new Transfer[0]; |
| DropTargetEffect dropEffect; |
| int feedback = DND.FEEDBACK_NONE; |
| |
| // Track application selections |
| TransferData selectedDataType; |
| int selectedOperation; |
| |
| // workaround - There is no event for "operation changed" so track operation based on key state |
| int keyOperation = -1; |
| |
| static final String DEFAULT_DROP_TARGET_EFFECT = "DEFAULT_DROP_TARGET_EFFECT"; //$NON-NLS-1$ |
| static final String IS_ACTIVE = "org.eclipse.swt.internal.isActive"; //$NON-NLS-1$ |
| |
| void addDragHandlers() { |
| // Our strategy here is to dynamically add methods to the control's class that are required |
| // by NSDraggingDestination. Then, when setTransfer is called, we just register |
| // the types with the Control's NSView and AppKit will call the methods in the protocol |
| // when a drag goes over the view. |
| |
| long cls = OS.object_getClass(control.view.id); |
| |
| if (cls == 0) { |
| DND.error(DND.ERROR_CANNOT_INIT_DROP); |
| } |
| |
| // If we already added it, no need to do it again. |
| long procPtr = OS.class_getMethodImplementation(cls, OS.sel_draggingEntered_); |
| if (procPtr == proc3Args) return; |
| addDragHandlers(cls); |
| |
| // If the content view can be image view, then add the dragging methods to image view too. |
| // This is used by Label so that dragging can work even when the Label has an image set on it. |
| long imageView = 0; |
| if ((imageView = OS.objc_msgSend(control.view.id, OS.sel_getImageView)) != 0) { |
| cls = OS.object_getClass(imageView); |
| addDragHandlers(cls); |
| } |
| } |
| |
| void addDragHandlers (long cls) { |
| // Add the NSDraggingDestination callbacks |
| OS.class_addMethod(cls, OS.sel_draggingEntered_, proc3Args, "@:@"); |
| OS.class_addMethod(cls, OS.sel_draggingUpdated_, proc3Args, "@:@"); |
| OS.class_addMethod(cls, OS.sel_draggingExited_, proc3Args, "@:@"); |
| OS.class_addMethod(cls, OS.sel_performDragOperation_, proc3Args, "@:@"); |
| OS.class_addMethod(cls, OS.sel_wantsPeriodicDraggingUpdates, proc2Args, "@:"); |
| |
| if (OS.class_getSuperclass(cls) == OS.class_NSOutlineView) { |
| OS.class_addMethod(cls, OS.sel_outlineView_acceptDrop_item_childIndex_, proc6Args, "@:@@@i"); |
| OS.class_addMethod(cls, OS.sel_outlineView_validateDrop_proposedItem_proposedChildIndex_, proc6Args, "@:@@@i"); |
| } else if (OS.class_getSuperclass(cls) == OS.class_NSTableView) { |
| OS.class_addMethod(cls, OS.sel_tableView_acceptDrop_row_dropOperation_, proc6Args, "@:@@@i"); |
| OS.class_addMethod(cls, OS.sel_tableView_validateDrop_proposedRow_proposedDropOperation_, proc6Args, "@:@@@i"); |
| } |
| } |
| |
| /** |
| * 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 <code>DropTargetListener</code> |
| * interface. |
| * |
| * <ul> |
| * <li><code>dragEnter</code> is called when the cursor has entered the drop target boundaries |
| * <li><code>dragLeave</code> is called when the cursor has left the drop target boundaries and just before |
| * the drop occurs or is cancelled. |
| * <li><code>dragOperationChanged</code> is called when the operation being performed has changed |
| * (usually due to the user changing the selected modifier key(s) while dragging) |
| * <li><code>dragOver</code> is called when the cursor is moving over the drop target |
| * <li><code>dropAccept</code> is called just before the drop is performed. The drop target is given |
| * the chance to change the nature of the drop or veto the drop by setting the <code>event.detail</code> field |
| * <li><code>drop</code> is called when the data is being dropped |
| * </ul> |
| * |
| * @param listener the listener which should be notified |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see DropTargetListener |
| * @see #getDropListeners |
| * @see #removeDropListener |
| * @see DropTargetEvent |
| */ |
| public void addDropListener(DropTargetListener listener) { |
| if (listener == null) DND.error (SWT.ERROR_NULL_ARGUMENT); |
| DNDListener typedListener = new DNDListener (listener); |
| typedListener.dndWidget = this; |
| addListener (DND.DragEnter, typedListener); |
| addListener (DND.DragLeave, typedListener); |
| addListener (DND.DragOver, typedListener); |
| addListener (DND.DragOperationChanged, typedListener); |
| addListener (DND.Drop, typedListener); |
| addListener (DND.DropAccept, typedListener); |
| } |
| |
| long dndCallSuper (long id, long sel, long arg0) { |
| 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); |
| } |
| |
| static int checkStyle (int style) { |
| if (style == SWT.NONE) return DND.DROP_MOVE; |
| return style; |
| } |
| |
| @Override |
| protected void checkSubclass () { |
| String name = getClass().getName (); |
| String validName = DropTarget.class.getName(); |
| if (!validName.equals(name)) { |
| DND.error (SWT.ERROR_INVALID_SUBCLASS); |
| } |
| } |
| |
| int draggingEntered(long id, long sel, NSObject sender) { |
| if (sender == null) return OS.NSDragOperationNone; |
| |
| DNDEvent event = new DNDEvent(); |
| if (!setEventData(sender, event)) { |
| keyOperation = -1; |
| setDropNotAllowed(); |
| return OS.NSDragOperationNone; |
| } |
| |
| int allowedOperations = event.operations; |
| TransferData[] allowedDataTypes = new TransferData[event.dataTypes.length]; |
| System.arraycopy(event.dataTypes, 0, allowedDataTypes, 0, allowedDataTypes.length); |
| |
| selectedDataType = null; |
| selectedOperation = DND.DROP_NONE; |
| notifyListeners(DND.DragEnter, event); |
| |
| if (event.detail == DND.DROP_DEFAULT) { |
| event.detail = (allowedOperations & DND.DROP_MOVE) != 0 ? DND.DROP_MOVE : DND.DROP_NONE; |
| } |
| |
| if (event.dataType != null) { |
| for (int i = 0; i < allowedDataTypes.length; i++) { |
| if (allowedDataTypes[i].type == event.dataType.type) { |
| selectedDataType = allowedDataTypes[i]; |
| break; |
| } |
| } |
| } |
| |
| if (selectedDataType != null && (allowedOperations & event.detail) != 0) { |
| selectedOperation = event.detail; |
| } |
| |
| if (selectedOperation == DND.DROP_NONE) { |
| setDropNotAllowed(); |
| } else { |
| if(((Boolean)control.getData(IS_ACTIVE)).booleanValue() == false) { |
| setDropNotAllowed(); |
| } else { |
| clearDropNotAllowed(); |
| } |
| } |
| |
| if (new NSObject(id).isKindOfClass(OS.class_NSTableView)) { |
| return (int)dndCallSuper(id, sel, sender.id); |
| } |
| return opToOsOp(selectedOperation); |
| } |
| |
| void draggingExited(long id, long sel, NSObject sender) { |
| clearDropNotAllowed(); |
| if (keyOperation == -1) return; |
| keyOperation = -1; |
| |
| DNDEvent event = new DNDEvent(); |
| event.widget = this; |
| event.time = (int)System.currentTimeMillis(); |
| event.detail = DND.DROP_NONE; |
| notifyListeners(DND.DragLeave, event); |
| |
| if (new NSObject(id).isKindOfClass(OS.class_NSTableView)) { |
| dndCallSuper(id, sel, sender.id); |
| } |
| } |
| |
| int draggingUpdated(long id, long sel, NSObject sender) { |
| if (sender == null) return OS.NSDragOperationNone; |
| int oldKeyOperation = keyOperation; |
| |
| DNDEvent event = new DNDEvent(); |
| if (!setEventData(sender, event)) { |
| keyOperation = -1; |
| setDropNotAllowed(); |
| return OS.NSDragOperationNone; |
| } |
| |
| int allowedOperations = event.operations; |
| TransferData[] allowedDataTypes = new TransferData[event.dataTypes.length]; |
| System.arraycopy(event.dataTypes, 0, allowedDataTypes, 0, allowedDataTypes.length); |
| |
| if (keyOperation == oldKeyOperation) { |
| event.type = DND.DragOver; |
| event.dataType = selectedDataType; |
| event.detail = selectedOperation; |
| } else { |
| event.type = DND.DragOperationChanged; |
| event.dataType = selectedDataType; |
| } |
| |
| selectedDataType = null; |
| selectedOperation = DND.DROP_NONE; |
| notifyListeners(event.type, event); |
| if (event.detail == DND.DROP_DEFAULT) { |
| event.detail = (allowedOperations & DND.DROP_MOVE) != 0 ? DND.DROP_MOVE : DND.DROP_NONE; |
| } |
| |
| if (event.dataType != null) { |
| for (int i = 0; i < allowedDataTypes.length; i++) { |
| if (allowedDataTypes[i].type == event.dataType.type) { |
| selectedDataType = allowedDataTypes[i]; |
| break; |
| } |
| } |
| } |
| |
| if (selectedDataType != null && (event.detail & allowedOperations) != 0) { |
| selectedOperation = event.detail; |
| } |
| |
| if (selectedOperation == DND.DROP_NONE) { |
| setDropNotAllowed(); |
| } else { |
| if(((Boolean)control.getData(IS_ACTIVE)).booleanValue() == false) { |
| setDropNotAllowed(); |
| } else { |
| clearDropNotAllowed(); |
| } |
| } |
| |
| if (new NSObject(id).isKindOfClass(OS.class_NSTableView)) { |
| return (int)dndCallSuper(id, sel, sender.id); |
| } |
| |
| return opToOsOp(selectedOperation); |
| } |
| |
| /** |
| * Creates a new <code>DropTarget</code> to allow data to be dropped on the specified |
| * <code>Control</code>. |
| * Creating an instance of a DropTarget may cause system resources to be allocated |
| * depending on the platform. It is therefore mandatory that the DropTarget instance |
| * be disposed when no longer required. |
| * |
| * @param control the <code>Control</code> over which the user positions the cursor to drop the data |
| * @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 <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * @exception SWTError <ul> |
| * <li>ERROR_CANNOT_INIT_DROP - unable to initiate drop target; this will occur if more than one |
| * drop target is created for a control or if the operating system will not allow the creation |
| * of the drop target</li> |
| * </ul> |
| * |
| * <p>NOTE: ERROR_CANNOT_INIT_DROP should be an SWTException, since it is a |
| * recoverable error, but can not be changed due to backward compatibility.</p> |
| * |
| * @see Widget#dispose |
| * @see DropTarget#checkSubclass |
| * @see DND#DROP_NONE |
| * @see DND#DROP_COPY |
| * @see DND#DROP_MOVE |
| * @see DND#DROP_LINK |
| */ |
| public DropTarget(Control control, int style) { |
| super(control, checkStyle(style)); |
| this.control = control; |
| |
| if (control.getData(DND.DROP_TARGET_KEY) != null) { |
| DND.error(DND.ERROR_CANNOT_INIT_DROP); |
| } |
| |
| control.setData(DND.DROP_TARGET_KEY, this); |
| |
| controlListener = event -> { |
| if (!DropTarget.this.isDisposed()) { |
| DropTarget.this.dispose(); |
| } |
| }; |
| control.addListener (SWT.Dispose, controlListener); |
| |
| this.addListener(SWT.Dispose, event -> onDispose()); |
| |
| Object effect = control.getData(DEFAULT_DROP_TARGET_EFFECT); |
| if (effect instanceof DropTargetEffect) { |
| dropEffect = (DropTargetEffect) effect; |
| } else if (control instanceof Table) { |
| dropEffect = new TableDropTargetEffect((Table) control); |
| } else if (control instanceof Tree) { |
| dropEffect = new TreeDropTargetEffect((Tree) control); |
| } |
| |
| addDragHandlers(); |
| } |
| |
| static long dropTargetProc(long id, long sel) { |
| Display display = Display.findDisplay(Thread.currentThread()); |
| if (display == null || display.isDisposed()) return 0; |
| Widget widget = display.findWidget(id); |
| if (widget == null) return 0; |
| DropTarget dt = (DropTarget)widget.getData(DND.DROP_TARGET_KEY); |
| if (dt == null) return 0; |
| |
| if (sel == OS.sel_wantsPeriodicDraggingUpdates) { |
| return dt.wantsPeriodicDraggingUpdates(id, sel) ? 1 : 0; |
| } |
| |
| return 0; |
| } |
| |
| static long dropTargetProc(long id, long sel, long arg0) { |
| Display display = Display.findDisplay(Thread.currentThread()); |
| if (display == null || display.isDisposed()) return 0; |
| Widget widget = display.findWidget(id); |
| if (widget == null) return 0; |
| DropTarget dt = (DropTarget)widget.getData(DND.DROP_TARGET_KEY); |
| if (dt == null) return 0; |
| |
| // arg0 is _always_ the sender, and implements NSDraggingInfo. |
| // Looks like an NSObject for our purposes, though. |
| NSObject sender = new NSObject(arg0); |
| |
| if (sel == OS.sel_draggingEntered_) { |
| return dt.draggingEntered(id, sel, sender); |
| } else if (sel == OS.sel_draggingUpdated_) { |
| return dt.draggingUpdated(id, sel, sender); |
| } else if (sel == OS.sel_draggingExited_) { |
| dt.draggingExited(id, sel, sender); |
| } else if (sel == OS.sel_performDragOperation_) { |
| return dt.performDragOperation(id, sel, sender) ? 1 : 0; |
| } |
| |
| return 0; |
| } |
| |
| static long dropTargetProc(long id, long sel, long arg0, long arg1, long arg2, long arg3) { |
| Display display = Display.findDisplay(Thread.currentThread()); |
| if (display == null || display.isDisposed()) return 0; |
| Widget widget = display.findWidget(id); |
| if (widget == null) return 0; |
| DropTarget dt = (DropTarget)widget.getData(DND.DROP_TARGET_KEY); |
| if (dt == null) return 0; |
| |
| if (sel == OS.sel_outlineView_acceptDrop_item_childIndex_) { |
| return dt.outlineView_acceptDrop_item_childIndex(id, sel, arg0, arg1, arg2, arg3) ? 1 : 0; |
| } else if (sel == OS.sel_outlineView_validateDrop_proposedItem_proposedChildIndex_) { |
| return dt.outlineView_validateDrop_proposedItem_proposedChildIndex(id, sel, arg0, arg1, arg2, arg3); |
| } else if (sel == OS.sel_tableView_acceptDrop_row_dropOperation_) { |
| return dt.tableView_acceptDrop_row_dropOperation(id, sel, arg0, arg1, arg2, arg3) ? 1 : 0; |
| } else if (sel == OS.sel_tableView_validateDrop_proposedRow_proposedDropOperation_) { |
| return dt.tableView_validateDrop_proposedRow_proposedDropOperation(id, sel, arg0, arg1, arg2, arg3); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Returns the Control which is registered for this DropTarget. This is the control over which the |
| * user positions the cursor to drop the data. |
| * |
| * @return the Control which is registered for this DropTarget |
| */ |
| 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 <code>DropTargetListener</code> interface. |
| * |
| * @return the listeners who will be notified when a drag and drop |
| * operation is in progress |
| * |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see DropTargetListener |
| * @see #addDropListener |
| * @see #removeDropListener |
| * @see DropTargetEvent |
| * |
| * @since 3.4 |
| */ |
| public DropTargetListener[] getDropListeners() { |
| Listener[] listeners = getListeners(DND.DragEnter); |
| int length = listeners.length; |
| DropTargetListener[] dropListeners = new DropTargetListener[length]; |
| int count = 0; |
| for (int i = 0; i < length; i++) { |
| Listener listener = listeners[i]; |
| if (listener instanceof DNDListener) { |
| dropListeners[count] = (DropTargetListener) ((DNDListener) listener).getEventListener(); |
| count++; |
| } |
| } |
| if (count == length) return dropListeners; |
| DropTargetListener[] result = new DropTargetListener[count]; |
| System.arraycopy(dropListeners, 0, result, 0, count); |
| return result; |
| } |
| |
| /** |
| * Returns the drop effect for this DropTarget. This drop effect will be |
| * used during a drag and drop to display the drag under effect on the |
| * target widget. |
| * |
| * @return the drop effect that is registered for this DropTarget |
| * |
| * @since 3.3 |
| */ |
| public DropTargetEffect getDropTargetEffect() { |
| return dropEffect; |
| } |
| |
| int getOperationFromKeyState() { |
| // The NSDraggingInfo object already combined the modifier keys with the |
| // drag source's allowed events. This might be better accomplished by diffing |
| // the base drag source mask with the active drag state mask instead of snarfing |
| // the current event. |
| |
| // See documentation on [NSDraggingInfo draggingSourceOperationMask] for the |
| // correct Cocoa behavior. Control + Option or Command is NSDragOperationGeneric, |
| // or DND.DROP_DEFAULT in the SWT. |
| NSEvent currEvent = NSApplication.sharedApplication().currentEvent(); |
| if (currEvent != null) { |
| long modifiers = currEvent.modifierFlags(); |
| boolean option = (modifiers & OS.NSAlternateKeyMask) == OS.NSAlternateKeyMask; |
| boolean control = (modifiers & OS.NSControlKeyMask) == OS.NSControlKeyMask; |
| if (control && option) return DND.DROP_DEFAULT; |
| if (control) return DND.DROP_LINK; |
| if (option) return DND.DROP_COPY; |
| } |
| return DND.DROP_DEFAULT; |
| } |
| |
| /** |
| * Returns a list of the data types that can be transferred to this DropTarget. |
| * |
| * @return a list of the data types that can be transferred to this DropTarget |
| */ |
| public Transfer[] getTransfer() { |
| return transferAgents; |
| } |
| |
| void onDispose () { |
| if (control == null) |
| return; |
| if (controlListener != null) |
| control.removeListener(SWT.Dispose, controlListener); |
| controlListener = null; |
| control.setData(DND.DROP_TARGET_KEY, null); |
| transferAgents = null; |
| |
| // Unregister the control as a drop target. |
| control.view.unregisterDraggedTypes(); |
| control = null; |
| } |
| |
| 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 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; |
| } |
| |
| boolean drop(NSObject sender) { |
| clearDropNotAllowed(); |
| DNDEvent event = new DNDEvent(); |
| event.widget = this; |
| event.time = (int)System.currentTimeMillis(); |
| |
| if (dropEffect != null) { |
| NSPoint mouseLocation = sender.draggingLocation(); |
| NSPoint globalLoc = sender.draggingDestinationWindow().convertBaseToScreen(mouseLocation); |
| event.item = dropEffect.getItem((int)globalLoc.x, (int)globalLoc.y); |
| } |
| |
| event.detail = DND.DROP_NONE; |
| notifyListeners(DND.DragLeave, event); |
| |
| event = new DNDEvent(); |
| if (!setEventData(sender, event) || (((Boolean)control.getData(IS_ACTIVE)).booleanValue() == false)) { |
| return false; |
| } |
| |
| keyOperation = -1; |
| int allowedOperations = event.operations; |
| TransferData[] allowedDataTypes = new TransferData[event.dataTypes.length]; |
| System.arraycopy(event.dataTypes, 0, allowedDataTypes, 0, event.dataTypes.length); |
| event.dataType = selectedDataType; |
| event.detail = selectedOperation; |
| notifyListeners(DND.DropAccept, event); |
| |
| selectedDataType = null; |
| if (event.dataType != null) { |
| for (int i = 0; i < allowedDataTypes.length; i++) { |
| if (allowedDataTypes[i].type == event.dataType.type) { |
| selectedDataType = allowedDataTypes[i]; |
| break; |
| } |
| } |
| } |
| |
| selectedOperation = DND.DROP_NONE; |
| if (selectedDataType != null && (event.detail & allowedOperations) != 0) { |
| selectedOperation = event.detail; |
| } |
| |
| if (selectedOperation == DND.DROP_NONE) { |
| return false; |
| } |
| |
| // ask drag source for dropped data |
| NSPasteboard pasteboard = sender.draggingPasteboard(); |
| NSObject data = null; |
| NSMutableArray types = NSMutableArray.arrayWithCapacity(10); |
| |
| for (int i = 0; i < transferAgents.length; i++){ |
| Transfer transfer = transferAgents[i]; |
| String[] typeNames = transfer.getTypeNames(); |
| int[] typeIds = transfer.getTypeIds(); |
| |
| for (int j = 0; j < typeNames.length; j++) { |
| if (selectedDataType.type == typeIds[j]) { |
| types.addObject(NSString.stringWith(typeNames[j])); |
| break; |
| } |
| } |
| } |
| |
| NSString type = pasteboard.availableTypeFromArray(types); |
| TransferData tdata = new TransferData(); |
| |
| if (type != null) { |
| tdata.type = Transfer.registerType(type.getString()); |
| if (type.isEqual(OS.NSPasteboardTypeString) || |
| type.isEqual(OS.NSPasteboardTypeHTML) || |
| type.isEqual(OS.NSPasteboardTypeRTF)) { |
| tdata.data = pasteboard.stringForType(type); |
| } else if (type.isEqual(OS.NSURLPboardType) || type.isEqual(OS.kUTTypeURL)) { |
| tdata.data = NSURL.URLFromPasteboard(pasteboard); |
| } else if (type.isEqual(OS.NSFilenamesPboardType) || type.isEqual(OS.kUTTypeFileURL)) { |
| tdata.data = new NSArray(pasteboard.propertyListForType(OS.NSFilenamesPboardType).id); |
| } else { |
| tdata.data = pasteboard.dataForType(type); |
| } |
| } |
| |
| if (tdata.data != null) { |
| data = tdata.data; |
| } |
| |
| // Get Data in a Java format |
| Object object = null; |
| for (int i = 0; i < transferAgents.length; i++) { |
| Transfer transfer = transferAgents[i]; |
| if (transfer != null && transfer.isSupportedType(selectedDataType)) { |
| selectedDataType.data = data; |
| object = transfer.nativeToJava(selectedDataType); |
| break; |
| } |
| } |
| |
| if (object == null) { |
| selectedOperation = DND.DROP_NONE; |
| } |
| |
| event.dataType = selectedDataType; |
| event.detail = selectedOperation; |
| event.data = object; |
| notifyListeners(DND.Drop, event); |
| selectedOperation = DND.DROP_NONE; |
| if ((allowedOperations & event.detail) == event.detail) { |
| selectedOperation = event.detail; |
| } |
| //notify source of action taken |
| return (selectedOperation != DND.DROP_NONE); |
| } |
| |
| boolean performDragOperation(long id, long sel, NSObject sender) { |
| if (new NSObject(id).isKindOfClass(OS.class_NSTableView)) { |
| return dndCallSuper(id, sel, sender.id) != 0; |
| } |
| |
| return drop (sender); |
| } |
| |
| boolean outlineView_acceptDrop_item_childIndex(long id, long sel, long outlineView, long info, long item, long index) { |
| return drop(new NSObject(info)); |
| } |
| |
| long outlineView_validateDrop_proposedItem_proposedChildIndex(long id, long sel, long outlineView, long info, long item, long index) { |
| //TODO expansion animation and auto collapse not working because of outlineView:shouldExpandItem: |
| NSOutlineView widget = new NSOutlineView(outlineView); |
| NSObject sender = new NSObject(info); |
| NSPoint pt = sender.draggingLocation(); |
| pt = widget.convertPoint_fromView_(pt, null); |
| Tree tree = (Tree)getControl(); |
| TreeItem childItem = tree.getItem(new Point((int)pt.x, (int)pt.y)); |
| if (feedback == 0 || childItem == null) { |
| widget.setDropItem(null, -1); |
| } else { |
| if ((feedback & DND.FEEDBACK_SELECT) != 0) { |
| widget.setDropItem(childItem.handle, -1); |
| } else { |
| TreeItem parentItem = childItem.getParentItem(); |
| int childIndex; |
| id parentID = null; |
| if (parentItem != null) { |
| parentID = parentItem.handle; |
| childIndex = parentItem.indexOf(childItem); |
| } else { |
| childIndex = ((Tree)getControl()).indexOf(childItem); |
| } |
| if ((feedback & DND.FEEDBACK_INSERT_AFTER) != 0) { |
| widget.setDropItem(parentID, childIndex + 1); |
| } |
| if ((feedback & DND.FEEDBACK_INSERT_BEFORE) != 0) { |
| widget.setDropItem(parentID, childIndex); |
| } |
| } |
| } |
| |
| return opToOsOp(selectedOperation); |
| } |
| |
| /** |
| * 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 <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
| * </ul> |
| * |
| * @see DropTargetListener |
| * @see #addDropListener |
| * @see #getDropListeners |
| */ |
| public void removeDropListener(DropTargetListener listener) { |
| if (listener == null) DND.error (SWT.ERROR_NULL_ARGUMENT); |
| removeListener (DND.DragEnter, listener); |
| removeListener (DND.DragLeave, listener); |
| removeListener (DND.DragOver, listener); |
| removeListener (DND.DragOperationChanged, listener); |
| removeListener (DND.Drop, listener); |
| removeListener (DND.DropAccept, listener); |
| } |
| |
| /** |
| * Specifies the drop effect for this DropTarget. This drop effect will be |
| * used during a drag and drop to display the drag under effect on the |
| * target widget. |
| * |
| * @param effect the drop effect that is registered for this DropTarget |
| * |
| * @since 3.3 |
| */ |
| public void setDropTargetEffect(DropTargetEffect effect) { |
| dropEffect = effect; |
| } |
| |
| boolean setEventData(NSObject draggingState, DNDEvent event) { |
| if (draggingState == null) return false; |
| |
| // get allowed operations |
| int style = getStyle(); |
| long allowedActions = draggingState.draggingSourceOperationMask(); |
| int operations = osOpToOp(allowedActions) & style; |
| if (operations == DND.DROP_NONE) return false; |
| |
| // get current operation |
| int operation = getOperationFromKeyState(); |
| keyOperation = operation; |
| if (operation == DND.DROP_DEFAULT) { |
| if ((style & DND.DROP_DEFAULT) == 0) { |
| operation = (operations & DND.DROP_MOVE) != 0 ? DND.DROP_MOVE : DND.DROP_NONE; |
| } |
| } else { |
| if ((operation & operations) == 0) operation = DND.DROP_NONE; |
| } |
| |
| |
| // get allowed transfer types |
| NSPasteboard dragPBoard = draggingState.draggingPasteboard(); |
| NSArray draggedTypes = dragPBoard.types(); |
| if (draggedTypes == null) return false; |
| |
| long draggedTypeCount = draggedTypes.count(); |
| |
| TransferData[] dataTypes = new TransferData[(int)draggedTypeCount]; |
| int index = -1; |
| for (int i = 0; i < draggedTypeCount; i++) { |
| id draggedType = draggedTypes.objectAtIndex(i); |
| NSString nativeDataType = new NSString(draggedType); |
| TransferData data = new TransferData(); |
| data.type = Transfer.registerType(nativeDataType.getString()); |
| |
| for (int j = 0; j < transferAgents.length; j++) { |
| Transfer transfer = transferAgents[j]; |
| if (transfer != null && transfer.isSupportedType(data)) { |
| dataTypes[++index] = data; |
| break; |
| } |
| } |
| } |
| if (index == -1) return false; |
| |
| if (index < dataTypes.length - 1) { |
| TransferData[] temp = new TransferData[index + 1]; |
| System.arraycopy(dataTypes, 0, temp, 0, index + 1); |
| dataTypes = temp; |
| } |
| |
| // Convert from window-relative to global coordinates, and flip it. |
| NSPoint mouse = draggingState.draggingLocation(); |
| NSPoint globalMouse = draggingState.draggingDestinationWindow().convertBaseToScreen(mouse); |
| NSArray screens = NSScreen.screens(); |
| if (screens == null) return false; |
| |
| NSRect screenRect = new NSScreen(screens.objectAtIndex(0)).frame(); |
| globalMouse.y = screenRect.height - globalMouse.y; |
| |
| event.widget = this; |
| event.x = (int)globalMouse.x; |
| event.y = (int)globalMouse.y; |
| event.time = (int)System.currentTimeMillis(); |
| event.feedback = DND.FEEDBACK_SELECT; |
| event.dataTypes = dataTypes; |
| event.dataType = dataTypes[0]; |
| event.operations = operations; |
| event.detail = operation; |
| if (dropEffect != null) { |
| event.item = dropEffect.getItem(event.x, event.y); |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Specifies the data types that can be transferred to this DropTarget. If data is |
| * being dragged that does not match one of these types, the drop target will be notified of |
| * the drag and drop operation but the currentDataType will be null and the operation |
| * will be DND.NONE. |
| * |
| * @param transferAgents a list of Transfer objects which define the types of data that can be |
| * dropped on this target |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if transferAgents is null</li> |
| * </ul> |
| */ |
| public void setTransfer(Transfer... transferAgents){ |
| if (transferAgents == null) DND.error(SWT.ERROR_NULL_ARGUMENT); |
| this.transferAgents = transferAgents; |
| |
| |
| // Register the types as valid drop types in Cocoa. |
| // Accumulate all of the transfer types into a list. |
| ArrayList typeStrings = new ArrayList(); |
| |
| for (int i = 0; i < this.transferAgents.length; i++) { |
| String[] types = transferAgents[i].getTypeNames(); |
| |
| for (int j = 0; j < types.length; j++) { |
| typeStrings.add(types[j]); |
| } |
| } |
| |
| // Convert to an NSArray of NSStrings so we can register with the Control. |
| int typeStringCount = typeStrings.size(); |
| NSMutableArray nsTypeStrings = NSMutableArray.arrayWithCapacity(typeStringCount); |
| |
| for (int i = 0; i < typeStringCount; i++) { |
| nsTypeStrings.addObject(NSString.stringWith((String)typeStrings.get(i))); |
| } |
| |
| control.view.registerForDraggedTypes(nsTypeStrings); |
| |
| } |
| |
| void setDropNotAllowed() { |
| if (!dropNotAllowed) { |
| NSCursor.currentCursor().push(); |
| Display display = getDisplay(); |
| display.setData (LOCK_CURSOR, Boolean.FALSE); |
| NSCursor.operationNotAllowedCursor().push(); |
| display.setData (LOCK_CURSOR, Boolean.TRUE); |
| dropNotAllowed = true; |
| } |
| } |
| |
| void clearDropNotAllowed() { |
| if (dropNotAllowed) { |
| Display display = getDisplay(); |
| display.setData (LOCK_CURSOR, Boolean.FALSE); |
| NSCursor.pop(); |
| display.setData (LOCK_CURSOR, Boolean.TRUE); |
| NSCursor.pop(); |
| dropNotAllowed = false; |
| } |
| } |
| |
| boolean tableView_acceptDrop_row_dropOperation(long id, long sel, long tableView, long info, long row, long operation) { |
| return drop(new NSObject(info)); |
| } |
| |
| int tableView_validateDrop_proposedRow_proposedDropOperation(long id, long sel, long tableView, long info, long row, long operation) { |
| NSTableView widget = new NSTableView(tableView); |
| NSObject sender = new NSObject(info); |
| NSPoint pt = sender.draggingLocation(); |
| pt = widget.convertPoint_fromView_(pt, null); |
| long hitRow = widget.rowAtPoint(pt); |
| if (0 <= hitRow && hitRow < widget.numberOfRows()) { |
| if (feedback == 0) { |
| widget.setDropRow(-1, OS.NSTableViewDropOn); |
| } else { |
| if ((feedback & DND.FEEDBACK_SELECT) != 0) { |
| widget.setDropRow(hitRow, OS.NSTableViewDropOn); |
| } else { |
| if ((feedback & DND.FEEDBACK_INSERT_AFTER) != 0) { |
| widget.setDropRow(hitRow + 1, OS.NSTableViewDropAbove); |
| } |
| if ((feedback & DND.FEEDBACK_INSERT_BEFORE) != 0) { |
| widget.setDropRow(hitRow, OS.NSTableViewDropAbove); |
| } |
| } |
| } |
| } |
| return opToOsOp(selectedOperation); |
| } |
| |
| // By returning true we get draggingUpdated messages even when the mouse isn't moving. |
| boolean wantsPeriodicDraggingUpdates(long id, long sel) { |
| return true; |
| } |
| |
| } |