| /******************************************************************************* |
| * Copyright (c) 2000, 2016 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 |
| *******************************************************************************/ |
| package org.eclipse.swt.dnd; |
| |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.internal.*; |
| import org.eclipse.swt.internal.gtk.*; |
| 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> |
| * |
| * <code><pre> |
| * 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. |
| * |
| * <code><pre> |
| * 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 |
| * } |
| * }); |
| * </pre></code> |
| * |
| * <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. |
| */ |
| public class DropTarget extends Widget { |
| |
| Control control; |
| Listener controlListener; |
| Transfer[] transferAgents = new Transfer[0]; |
| DropTargetEffect dropEffect; |
| |
| // 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; |
| |
| // workaround - Simulate events when the mouse is not moving |
| long dragOverStart; |
| Runnable dragOverHeartbeat; |
| DNDEvent dragOverEvent; |
| |
| int drag_motion_handler; |
| int drag_leave_handler; |
| int drag_data_received_handler; |
| int drag_drop_handler; |
| |
| static final String DEFAULT_DROP_TARGET_EFFECT = "DEFAULT_DROP_TARGET_EFFECT"; //$NON-NLS-1$ |
| static final String IS_ACTIVE = "org.eclipse.swt.internal.control.isactive"; //$NON-NLS-1$ |
| static final int DRAGOVER_HYSTERESIS = 50; |
| |
| static Callback Drag_Motion; |
| static Callback Drag_Leave; |
| static Callback Drag_Data_Received; |
| static Callback Drag_Drop; |
| |
| static { |
| Drag_Motion = new Callback(DropTarget.class, "Drag_Motion", 5); //$NON-NLS-1$ |
| if (Drag_Motion.getAddress() == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS); |
| Drag_Leave = new Callback(DropTarget.class, "Drag_Leave", 3); //$NON-NLS-1$ |
| if (Drag_Leave.getAddress() == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS); |
| Drag_Data_Received = new Callback(DropTarget.class, "Drag_Data_Received", 7); //$NON-NLS-1$ |
| if (Drag_Data_Received.getAddress() == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS); |
| Drag_Drop = new Callback(DropTarget.class, "Drag_Drop", 5); //$NON-NLS-1$ |
| if (Drag_Drop.getAddress() == 0) SWT.error(SWT.ERROR_NO_MORE_CALLBACKS); |
| } |
| |
| /** |
| * 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 (Drag_Motion == null || Drag_Leave == null || Drag_Data_Received == null || Drag_Drop == null) { |
| DND.error(DND.ERROR_CANNOT_INIT_DROP); |
| } |
| if (control.getData(DND.DROP_TARGET_KEY) != null) { |
| DND.error(DND.ERROR_CANNOT_INIT_DROP); |
| } |
| control.setData(DND.DROP_TARGET_KEY, this); |
| |
| drag_motion_handler = OS.g_signal_connect(control.handle, OS.drag_motion, Drag_Motion.getAddress(), 0); |
| drag_leave_handler = OS.g_signal_connect(control.handle, OS.drag_leave, Drag_Leave.getAddress(), 0); |
| drag_data_received_handler = OS.g_signal_connect(control.handle, OS.drag_data_received, Drag_Data_Received.getAddress(), 0); |
| drag_drop_handler = OS.g_signal_connect(control.handle, OS.drag_drop, Drag_Drop.getAddress(), 0); |
| |
| // Dispose listeners |
| 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); |
| } |
| |
| dragOverHeartbeat = () -> { |
| Control control1 = DropTarget.this.control; |
| if (control1 == null || control1.isDisposed() || dragOverStart == 0) return; |
| long time = System.currentTimeMillis(); |
| int delay = DRAGOVER_HYSTERESIS; |
| if (time < dragOverStart) { |
| delay = (int)(dragOverStart - time); |
| } else { |
| dragOverEvent.time += DRAGOVER_HYSTERESIS; |
| int allowedOperations = dragOverEvent.operations; |
| TransferData[] allowedTypes = dragOverEvent.dataTypes; |
| //pass a copy of data types in to listeners in case application modifies it |
| TransferData[] dataTypes = new TransferData[allowedTypes.length]; |
| System.arraycopy(allowedTypes, 0, dataTypes, 0, dataTypes.length); |
| |
| DNDEvent event = new DNDEvent(); |
| event.widget = dragOverEvent.widget; |
| event.x = dragOverEvent.x; |
| event.y = dragOverEvent.y; |
| event.time = dragOverEvent.time; |
| event.feedback = DND.FEEDBACK_SELECT; |
| event.dataTypes = dataTypes; |
| event.dataType = selectedDataType; |
| event.operations = dragOverEvent.operations; |
| event.detail = selectedOperation; |
| if (dropEffect != null) { |
| event.item = dropEffect.getItem(dragOverEvent.x, dragOverEvent.y); |
| } |
| selectedDataType = null; |
| selectedOperation = DND.DROP_NONE; |
| notifyListeners(DND.DragOver, event); |
| if (event.dataType != null) { |
| for (int i = 0; i < allowedTypes.length; i++) { |
| if (allowedTypes[i].type == event.dataType.type) { |
| selectedDataType = event.dataType; |
| break; |
| } |
| } |
| } |
| if (selectedDataType != null && (event.detail & allowedOperations) != 0) { |
| selectedOperation = event.detail; |
| } |
| } |
| control1 = DropTarget.this.control; |
| if (control1 == null || control1.isDisposed()) return; |
| control1.getDisplay().timerExec(delay, dragOverHeartbeat); |
| }; |
| } |
| |
| static int checkStyle (int style) { |
| if (style == SWT.NONE) return DND.DROP_MOVE; |
| return style; |
| } |
| |
| static long /*int*/ Drag_Data_Received ( long /*int*/ widget, long /*int*/ context, long /*int*/ x, long /*int*/ y, long /*int*/ data, long /*int*/ info, long /*int*/ time){ |
| DropTarget target = FindDropTarget(widget); |
| if (target == null) return 0; |
| target.drag_data_received (widget, context, (int)/*64*/x, (int)/*64*/y, data, (int)/*64*/info, (int)/*64*/time); |
| return 0; |
| } |
| |
| static long /*int*/ Drag_Drop(long /*int*/ widget, long /*int*/ context, long /*int*/ x, long /*int*/ y, long /*int*/ time) { |
| DropTarget target = FindDropTarget(widget); |
| if (target == null) return 0; |
| return target.drag_drop (widget, context, (int)/*64*/x, (int)/*64*/y, (int)/*64*/time) ? 1 : 0; |
| } |
| |
| static long /*int*/ Drag_Leave ( long /*int*/ widget, long /*int*/ context, long /*int*/ time){ |
| DropTarget target = FindDropTarget(widget); |
| if (target == null) return 0; |
| target.drag_leave (widget, context, (int)/*64*/time); |
| return 0; |
| } |
| |
| static long /*int*/ Drag_Motion ( long /*int*/ widget, long /*int*/ context, long /*int*/ x, long /*int*/ y, long /*int*/ time){ |
| DropTarget target = FindDropTarget(widget); |
| if (target == null) return 0; |
| return target.drag_motion (widget, context, (int)/*64*/x, (int)/*64*/y, (int)/*64*/time) ? 1 : 0; |
| } |
| |
| static DropTarget FindDropTarget(long /*int*/ handle) { |
| Display display = Display.findDisplay(Thread.currentThread()); |
| if (display == null || display.isDisposed()) return null; |
| Widget widget = display.findWidget(handle); |
| if (widget == null) return null; |
| return (DropTarget)widget.getData(DND.DROP_TARGET_KEY); |
| } |
| |
| /** |
| * 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. |
| * |
| * <p><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></p> |
| * |
| * @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); |
| } |
| |
| @Override |
| protected void checkSubclass () { |
| String name = getClass().getName (); |
| String validName = DropTarget.class.getName(); |
| if (!validName.equals(name)) { |
| DND.error (SWT.ERROR_INVALID_SUBCLASS); |
| } |
| } |
| |
| void drag_data_received ( long /*int*/ widget, long /*int*/ context, int x, int y, long /*int*/ selection_data, int info, int time){ |
| DNDEvent event = new DNDEvent(); |
| if (selection_data == 0 || !setEventData(context, x, y, time, event)) { |
| keyOperation = -1; |
| return; |
| } |
| keyOperation = -1; |
| |
| int allowedOperations = event.operations; |
| |
| // Get data in a Java format |
| Object object = null; |
| TransferData transferData = new TransferData(); |
| int length = OS.gtk_selection_data_get_length(selection_data); |
| int format = OS.gtk_selection_data_get_format(selection_data); |
| long /*int*/ data = OS.gtk_selection_data_get_data(selection_data); |
| long /*int*/ type = OS.gtk_selection_data_get_data_type(selection_data); |
| if (data != 0) { |
| transferData.type = type; |
| transferData.length = length; |
| transferData.pValue = data; |
| transferData.format = format; |
| for (int i = 0; i < transferAgents.length; i++) { |
| Transfer transfer = transferAgents[i]; |
| if (transfer != null && transfer.isSupportedType(transferData)) { |
| object = transfer.nativeToJava(transferData); |
| break; |
| } |
| } |
| } |
| if (object == null) { |
| selectedOperation = DND.DROP_NONE; |
| } |
| |
| event.detail = selectedOperation; |
| event.dataType = transferData; |
| event.data = object; |
| selectedOperation = DND.DROP_NONE; |
| notifyListeners(DND.Drop, event); |
| if ((allowedOperations & event.detail) == event.detail) { |
| selectedOperation = event.detail; |
| } |
| //stop native handler |
| OS.g_signal_stop_emission_by_name(widget, OS.drag_data_received); |
| |
| //notify source of action taken |
| OS.gtk_drag_finish(context, selectedOperation != DND.DROP_NONE, selectedOperation== DND.DROP_MOVE, time); |
| return; |
| } |
| |
| boolean drag_drop(long /*int*/ widget, long /*int*/ context, int x, int y, int time) { |
| DNDEvent event = new DNDEvent(); |
| if (!setEventData(context, x, y, time, event)) { |
| keyOperation = -1; |
| return false; |
| } |
| keyOperation = -1; |
| |
| int allowedOperations = event.operations; |
| TransferData[] allowedDataTypes = new TransferData[event.dataTypes.length]; |
| System.arraycopy(event.dataTypes, 0, allowedDataTypes, 0, allowedDataTypes.length); |
| |
| event.dataType = selectedDataType; |
| event.detail = selectedOperation; |
| selectedDataType = null; |
| selectedOperation = DND.DROP_NONE; |
| notifyListeners(DND.DropAccept,event); |
| 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) == event.detail)) { |
| selectedOperation = event.detail; |
| } |
| if (selectedOperation == DND.DROP_NONE) { |
| // this was not a successful drop |
| return false; |
| } |
| // ask drag source for dropped data |
| OS.gtk_drag_get_data(widget, context, selectedDataType.type, time); |
| return true; |
| } |
| |
| void drag_leave ( long /*int*/ widget, long /*int*/ context, int time){ |
| updateDragOverHover(0, null); |
| |
| if (keyOperation == -1) return; |
| keyOperation = -1; |
| |
| DNDEvent event = new DNDEvent(); |
| event.widget = this; |
| event.time = time; |
| event.detail = DND.DROP_NONE; |
| notifyListeners(DND.DragLeave, event); |
| } |
| |
| boolean drag_motion ( long /*int*/ widget, long /*int*/ context, int x, int y, int time){ |
| int oldKeyOperation = keyOperation; |
| |
| /* |
| * Bug in GTK. GTK allows drag & drop on a shell even if a modal |
| * dialog/window is opened on that shell. The fix is to check for |
| * any active modal dialogs/shells before allowing the drop. |
| */ |
| if ((oldKeyOperation == -1) || !((Boolean) control.getData(IS_ACTIVE)).booleanValue()) { //drag enter |
| selectedDataType = null; |
| selectedOperation = DND.DROP_NONE; |
| } |
| |
| DNDEvent event = new DNDEvent(); |
| if (!setEventData(context, x, y, time, event)) { |
| keyOperation = -1; |
| OS.gdk_drag_status(context, 0, time); |
| return false; |
| } |
| |
| int allowedOperations = event.operations; |
| TransferData[] allowedDataTypes = new TransferData[event.dataTypes.length]; |
| System.arraycopy(event.dataTypes, 0, allowedDataTypes, 0, allowedDataTypes.length); |
| |
| if (oldKeyOperation == -1) { |
| event.type = DND.DragEnter; |
| } else { |
| if (keyOperation == oldKeyOperation) { |
| event.type = DND.DragOver; |
| event.dataType = selectedDataType; |
| event.detail = selectedOperation; |
| } else { |
| event.type = DND.DragOperationChanged; |
| event.dataType = selectedDataType; |
| } |
| } |
| updateDragOverHover(DRAGOVER_HYSTERESIS, event); |
| 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 && (allowedOperations & event.detail) != 0) { |
| selectedOperation = event.detail; |
| } |
| |
| switch (selectedOperation) { |
| case DND.DROP_NONE: |
| OS.gdk_drag_status(context, 0, time); |
| break; |
| case DND.DROP_COPY: |
| OS.gdk_drag_status(context, OS.GDK_ACTION_COPY, time); |
| break; |
| case DND.DROP_MOVE: |
| OS.gdk_drag_status(context, OS.GDK_ACTION_MOVE, time); |
| break; |
| case DND.DROP_LINK: |
| OS.gdk_drag_status(context, OS.GDK_ACTION_LINK, time); |
| break; |
| } |
| |
| if (oldKeyOperation == -1) { |
| dragOverHeartbeat.run(); |
| } |
| return true; |
| } |
| |
| /** |
| * 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() { |
| int[] state = new int[1]; |
| if (OS.GTK3) { |
| long /*int*/ root = OS.gdk_get_default_root_window (); |
| long /*int*/ device_manager = OS.gdk_display_get_device_manager (OS.gdk_window_get_display (root)); |
| long /*int*/ pointer = OS.gdk_device_manager_get_client_pointer (device_manager); |
| OS.gdk_window_get_device_position(root, pointer, null, null, state); |
| } else { |
| OS.gdk_window_get_pointer(0, null, null, state); |
| } |
| boolean ctrl = (state[0] & OS.GDK_CONTROL_MASK) != 0; |
| boolean shift = (state[0] & OS.GDK_SHIFT_MASK) != 0; |
| if (ctrl && shift) return DND.DROP_LINK; |
| if (ctrl)return DND.DROP_COPY; |
| if (shift)return DND.DROP_MOVE; |
| 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; |
| OS.g_signal_handler_disconnect(control.handle, drag_motion_handler); |
| OS.g_signal_handler_disconnect(control.handle, drag_leave_handler); |
| OS.g_signal_handler_disconnect(control.handle, drag_data_received_handler); |
| OS.g_signal_handler_disconnect(control.handle, drag_drop_handler); |
| if (transferAgents.length != 0) |
| OS.gtk_drag_dest_unset(control.handle); |
| transferAgents = null; |
| if (controlListener != null) |
| control.removeListener(SWT.Dispose, controlListener); |
| control.setData(DND.DROP_TARGET_KEY, null); |
| control = null; |
| controlListener = null; |
| } |
| |
| int opToOsOp(int operation){ |
| int osOperation = 0; |
| if ((operation & DND.DROP_COPY) == DND.DROP_COPY) |
| osOperation |= OS.GDK_ACTION_COPY; |
| if ((operation & DND.DROP_MOVE) == DND.DROP_MOVE) |
| osOperation |= OS.GDK_ACTION_MOVE; |
| if ((operation & DND.DROP_LINK) == DND.DROP_LINK) |
| osOperation |= OS.GDK_ACTION_LINK; |
| return osOperation; |
| } |
| |
| int osOpToOp(int osOperation){ |
| int operation = DND.DROP_NONE; |
| if ((osOperation & OS.GDK_ACTION_COPY) == OS.GDK_ACTION_COPY) |
| operation |= DND.DROP_COPY; |
| if ((osOperation & OS.GDK_ACTION_MOVE) == OS.GDK_ACTION_MOVE) |
| operation |= DND.DROP_MOVE; |
| if ((osOperation & OS.GDK_ACTION_LINK) == OS.GDK_ACTION_LINK) |
| operation |= DND.DROP_LINK; |
| return operation; |
| } |
| |
| /** |
| * 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 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); |
| |
| if (this.transferAgents.length != 0) { |
| OS.gtk_drag_dest_unset(control.handle); |
| } |
| this.transferAgents = transferAgents; |
| |
| GtkTargetEntry[] targets = new GtkTargetEntry[0]; |
| for (int i = 0; i < transferAgents.length; i++) { |
| Transfer transfer = transferAgents[i]; |
| if (transfer != null) { |
| int[] typeIds = transfer.getTypeIds(); |
| String[] typeNames = transfer.getTypeNames(); |
| for (int j = 0; j < typeIds.length; j++) { |
| GtkTargetEntry entry = new GtkTargetEntry(); |
| byte[] buffer = Converter.wcsToMbcs(typeNames[j], true); |
| entry.target = OS.g_malloc(buffer.length); |
| OS.memmove(entry.target, buffer, buffer.length); |
| entry.info = typeIds[j]; |
| GtkTargetEntry[] newTargets = new GtkTargetEntry[targets.length + 1]; |
| System.arraycopy(targets, 0, newTargets, 0, targets.length); |
| newTargets[targets.length] = entry; |
| targets = newTargets; |
| } |
| } |
| } |
| |
| long /*int*/ pTargets = OS.g_malloc(targets.length * GtkTargetEntry.sizeof); |
| for (int i = 0; i < targets.length; i++) { |
| OS.memmove(pTargets + i*GtkTargetEntry.sizeof, targets[i], GtkTargetEntry.sizeof); |
| } |
| |
| int actions = opToOsOp(getStyle()); |
| if (control instanceof Combo) { |
| if ((control.getStyle() & SWT.READ_ONLY) == 0) { |
| long /*int*/ entryHandle = OS.gtk_bin_get_child (control.handle); |
| if (entryHandle != 0) { |
| OS.gtk_drag_dest_unset(entryHandle); |
| } |
| } |
| } |
| OS.gtk_drag_dest_set(control.handle, 0, pTargets, targets.length, actions); |
| |
| for (int i = 0; i < targets.length; i++) { |
| OS.g_free(targets[i].target); |
| } |
| } |
| |
| /** |
| * 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(long /*int*/ context, int x, int y, int time, DNDEvent event) { |
| if (context == 0) return false; |
| long /*int*/ targets = 0; |
| int actions = 0; |
| if (OS.GTK3) { |
| targets = OS.gdk_drag_context_list_targets(context); |
| actions = OS.gdk_drag_context_get_actions(context); |
| } else { |
| GdkDragContext dragContext = new GdkDragContext(); |
| OS.memmove(dragContext, context, GdkDragContext.sizeof); |
| targets = dragContext.targets; |
| actions = dragContext.actions; |
| } |
| if (targets == 0) return false; |
| |
| // get allowed operations |
| int style = getStyle(); |
| int operations = osOpToOp(actions) & 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 |
| TransferData[] dataTypes = new TransferData[0]; |
| while (targets != 0) { |
| long /*int*/ pData = OS.g_list_data(targets); |
| TransferData data = new TransferData(); |
| data.type = pData; |
| for (int j = 0; j < transferAgents.length; j++) { |
| Transfer transfer = transferAgents[j]; |
| if (transfer != null && transfer.isSupportedType(data)) { |
| TransferData[] newDataTypes = new TransferData[dataTypes.length + 1]; |
| System.arraycopy(dataTypes, 0, newDataTypes, 0, dataTypes.length); |
| newDataTypes[dataTypes.length] = data; |
| dataTypes = newDataTypes; |
| break; |
| } |
| } |
| targets = OS.g_list_next (targets); |
| } |
| if (dataTypes.length == 0) return false; |
| long /*int*/ window = OS.gtk_widget_get_window (control.handle); |
| int [] origin_x = new int[1], origin_y = new int[1]; |
| OS.gdk_window_get_origin(window, origin_x, origin_y); |
| Point coordinates = DPIUtil.autoScaleDown(new Point(origin_x[0] + x, origin_y[0] + y)); |
| |
| event.widget = this; |
| event.x = coordinates.x; |
| event.y = coordinates.y; |
| event.time = time; |
| 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(coordinates.x, coordinates.y); |
| } |
| return true; |
| } |
| |
| void updateDragOverHover(long delay, DNDEvent event) { |
| if (delay == 0) { |
| dragOverStart = 0; |
| dragOverEvent = null; |
| return; |
| } |
| dragOverStart = System.currentTimeMillis() + delay; |
| if (dragOverEvent == null) dragOverEvent = new DNDEvent(); |
| dragOverEvent.x = event.x; |
| dragOverEvent.y = event.y; |
| TransferData[] dataTypes = new TransferData[ event.dataTypes.length]; |
| System.arraycopy( event.dataTypes, 0, dataTypes, 0, dataTypes.length); |
| dragOverEvent.dataTypes = dataTypes; |
| dragOverEvent.operations = event.operations; |
| dragOverEvent.time = event.time; |
| } |
| |
| } |