Java tutorial
/******************************************************************************* * 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(); if (proc2Args == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS); dropTarget3Args = new Callback(clazz, "dropTargetProc", 3); proc3Args = dropTarget3Args.getAddress(); if (proc3Args == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS); dropTarget6Args = new Callback(clazz, "dropTargetProc", 6); proc6Args = dropTarget6Args.getAddress(); if (proc6Args == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS); } 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(); 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; } }