| /******************************************************************************* |
| * Copyright (c) 2000, 2018 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 |
| * Lars Vogel <Lars.Vogel@vogella.com> - Bug 497807 |
| *******************************************************************************/ |
| package org.eclipse.swt.dnd; |
| |
| |
| import java.lang.reflect.*; |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.internal.*; |
| import org.eclipse.swt.internal.dnd.gtk.*; |
| import org.eclipse.swt.internal.gtk.*; |
| import org.eclipse.swt.internal.gtk3.*; |
| import org.eclipse.swt.internal.gtk4.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /** |
| * |
| * <code>DragSource</code> defines the source object for a drag and drop transfer. |
| * |
| * <p>IMPORTANT: This class is <em>not</em> intended to be subclassed.</p> |
| * |
| * <p>A drag source is the object which originates a drag and drop operation. For the specified widget, |
| * it defines the type of data that is available for dragging and the set of operations that can |
| * be performed on that data. The operations can be any bit-wise combination of DND.MOVE, DND.COPY or |
| * DND.LINK. The type of data that can be transferred is specified by subclasses of Transfer such as |
| * TextTransfer or FileTransfer. The type of data transferred can be a predefined system type or it |
| * can be a type defined by the application. For instructions on how to define your own transfer type, |
| * refer to <code>ByteArrayTransfer</code>.</p> |
| * |
| * <p>You may have several DragSources in an application but you can only have one DragSource |
| * per Control. Data dragged from this DragSource can be dropped on a site within this application |
| * or it can be dropped on another application such as an external Text editor.</p> |
| * |
| * <p>The application supplies the content of the data being transferred by implementing the |
| * <code>DragSourceListener</code> and associating it with the DragSource via DragSource#addDragListener.</p> |
| * |
| * <p>When a successful move operation occurs, the application is required to take the appropriate |
| * action to remove the data from its display and remove any associated operating system resources or |
| * internal references. Typically in a move operation, the drop target makes a copy of the data |
| * and the drag source deletes the original. However, sometimes copying the data can take a long |
| * time (such as copying a large file). Therefore, on some platforms, the drop target may actually |
| * move the data in the operating system rather than make a copy. This is usually only done in |
| * file transfers. In this case, the drag source is informed in the DragEnd event that a |
| * DROP_TARGET_MOVE was performed. It is the responsibility of the drag source at this point to clean |
| * up its displayed information. No action needs to be taken on the operating system resources.</p> |
| * |
| * <p> The following example shows a Label widget that allows text to be dragged from it.</p> |
| * |
| * <pre><code> |
| * // Enable a label as a Drag Source |
| * Label label = new Label(shell, SWT.NONE); |
| * // This example will allow text to be dragged |
| * Transfer[] types = new Transfer[] {TextTransfer.getInstance()}; |
| * // This example will allow the text to be copied or moved to the drop target |
| * int operations = DND.DROP_MOVE | DND.DROP_COPY; |
| * |
| * DragSource source = new DragSource(label, operations); |
| * source.setTransfer(types); |
| * source.addDragListener(new DragSourceListener() { |
| * public void dragStart(DragSourceEvent e) { |
| * // Only start the drag if there is actually text in the |
| * // label - this text will be what is dropped on the target. |
| * if (label.getText().length() == 0) { |
| * event.doit = false; |
| * } |
| * }; |
| * public void dragSetData(DragSourceEvent event) { |
| * // A drop has been performed, so provide the data of the |
| * // requested type. |
| * // (Checking the type of the requested data is only |
| * // necessary if the drag source supports more than |
| * // one data type but is shown here as an example). |
| * if (TextTransfer.getInstance().isSupportedType(event.dataType)){ |
| * event.data = label.getText(); |
| * } |
| * } |
| * public void dragFinished(DragSourceEvent event) { |
| * // A Move operation has been performed so remove the data |
| * // from the source |
| * if (event.detail == DND.DROP_MOVE) |
| * label.setText(""); |
| * } |
| * }); |
| * </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.DragStart, DND.DragSetData, DND.DragEnd</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 DragSource extends Widget { |
| |
| // info for registering as a drag source |
| Control control; |
| Listener controlListener; |
| Transfer[] transferAgents = new Transfer[0]; |
| DragSourceEffect dragEffect; |
| |
| long targetList; |
| |
| //workaround - remember action performed for DragEnd |
| boolean moveData = false; |
| |
| static final String DEFAULT_DRAG_SOURCE_EFFECT = "DEFAULT_DRAG_SOURCE_EFFECT"; //$NON-NLS-1$ |
| |
| /* GTK4 GtkDragSource event controller signal callbacks */ |
| static Callback dragBeginProc, dragPrepareProc, dragEndProc; |
| |
| /* GTK3 GtkWidget drag event signal callbacks */ |
| static Callback DragBegin, DragGetData, DragEnd, DragDataDelete; |
| |
| static { |
| if (GTK.GTK4) { |
| dragBeginProc = new Callback(DragSource.class, "dragBeginProc", void.class, new Type[] { long.class, long.class }); |
| dragPrepareProc = new Callback(DragSource.class, "dragPrepareProc", long.class, new Type[] { long.class, double.class, double.class }); |
| dragEndProc = new Callback(DragSource.class, "dragEndProc", void.class, new Type[] { long.class, long.class, boolean.class }); |
| } else { |
| DragBegin = new Callback(DragSource.class, "DragBegin", 2); //$NON-NLS-1$ |
| DragGetData = new Callback(DragSource.class, "DragGetData", 5); //$NON-NLS-1$ |
| DragEnd = new Callback(DragSource.class, "DragEnd", 2); //$NON-NLS-1$ |
| DragDataDelete = new Callback(DragSource.class, "DragDataDelete", 2); //$NON-NLS-1$ |
| } |
| } |
| |
| /** |
| * Creates a new <code>DragSource</code> to handle dragging from the specified <code>Control</code>. |
| * Creating an instance of a DragSource may cause system resources to be allocated depending on the platform. |
| * It is therefore mandatory that the DragSource instance be disposed when no longer required. |
| * |
| * @param control the <code>Control</code> that the user clicks on to initiate the drag |
| * @param style the bitwise OR'ing of allowed operations; this may be a combination of any of |
| * DND.DROP_NONE, DND.DROP_COPY, DND.DROP_MOVE, DND.DROP_LINK |
| * |
| * @exception SWTException <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_DRAG - unable to initiate drag source; this will occur if more than one |
| * drag source is created for a control or if the operating system will not allow the creation |
| * of the drag source</li> |
| * </ul> |
| * |
| * <p>NOTE: ERROR_CANNOT_INIT_DRAG should be an SWTException, since it is a |
| * recoverable error, but can not be changed due to backward compatibility.</p> |
| * |
| * @see Widget#dispose |
| * @see DragSource#checkSubclass |
| * @see DND#DROP_NONE |
| * @see DND#DROP_COPY |
| * @see DND#DROP_MOVE |
| * @see DND#DROP_LINK |
| */ |
| public DragSource(Control control, int style) { |
| super (control, checkStyle(style)); |
| this.control = control; |
| |
| if (GTK.GTK4) { |
| if (dragBeginProc == null || dragPrepareProc == null || dragEndProc == null) { |
| DND.error(DND.ERROR_CANNOT_INIT_DRAG); |
| } |
| if (control.getData(DND.DRAG_SOURCE_KEY) != null) { |
| DND.error(DND.ERROR_CANNOT_INIT_DRAG); |
| } |
| control.setData(DND.DRAG_SOURCE_KEY, this); |
| |
| long dragSourceController = GTK4.gtk_drag_source_new(); |
| GTK.gtk_widget_add_controller(control.handle, dragSourceController); |
| |
| OS.g_signal_connect(dragSourceController, OS.drag_begin, dragBeginProc.getAddress(), 0); |
| OS.g_signal_connect(dragSourceController, OS.prepare, dragPrepareProc.getAddress(), 0); |
| OS.g_signal_connect(dragSourceController, OS.drag_end, dragEndProc.getAddress(), 0); |
| |
| // Set permitted actions on the GtkDragSource |
| int actions = opToOsOp(style); |
| GTK4.gtk_drag_source_set_actions(dragSourceController, actions); |
| } else { |
| if (DragGetData == null || DragEnd == null || DragDataDelete == null) { |
| DND.error(DND.ERROR_CANNOT_INIT_DRAG); |
| } |
| if (control.getData(DND.DRAG_SOURCE_KEY) != null) { |
| DND.error(DND.ERROR_CANNOT_INIT_DRAG); |
| } |
| control.setData(DND.DRAG_SOURCE_KEY, this); |
| |
| OS.g_signal_connect(control.handle, OS.drag_begin, DragBegin.getAddress(), 0); |
| OS.g_signal_connect(control.handle, OS.drag_data_get, DragGetData.getAddress(), 0); |
| OS.g_signal_connect(control.handle, OS.drag_end, DragEnd.getAddress(), 0); |
| OS.g_signal_connect(control.handle, OS.drag_data_delete, DragDataDelete.getAddress(), 0); |
| |
| |
| |
| controlListener = event -> { |
| if (event.type == SWT.Dispose) { |
| if (!DragSource.this.isDisposed()) { |
| DragSource.this.dispose(); |
| } |
| } |
| if (event.type == SWT.DragDetect) { |
| if (!DragSource.this.isDisposed()) { |
| DragSource.this.drag(event); |
| } |
| } |
| }; |
| control.addListener (SWT.Dispose, controlListener); |
| control.addListener (SWT.DragDetect, controlListener); |
| |
| Object effect = control.getData(DEFAULT_DRAG_SOURCE_EFFECT); |
| if (effect instanceof DragSourceEffect) { |
| dragEffect = (DragSourceEffect) effect; |
| } else if (control instanceof Tree) { |
| dragEffect = new TreeDragSourceEffect((Tree) control); |
| } else if (control instanceof Table) { |
| dragEffect = new TableDragSourceEffect((Table) control); |
| } else if (control instanceof List) { |
| dragEffect = new ListDragSourceEffect((List) control); |
| } |
| |
| this.addListener(SWT.Dispose, e -> onDispose()); |
| } |
| } |
| |
| static int checkStyle (int style) { |
| if (style == SWT.NONE) return DND.DROP_MOVE; |
| return style; |
| } |
| |
| static void dragBeginProc(long source, long drag) { |
| long widgetHandle = GTK.gtk_event_controller_get_widget(source); |
| DragSource dragSource = FindDragSource(widgetHandle); |
| if (dragSource == null) return; |
| |
| dragSource.dragBeginGtk4(source); |
| } |
| |
| void dragBeginGtk4(long source) { |
| DNDEvent event = new DNDEvent(); |
| event.widget = this; |
| event.doit = true; |
| notifyListeners(DND.DragStart, event); |
| if (!event.doit || transferAgents == null || transferAgents.length == 0) return; |
| |
| // If specified, setup drag icon |
| Image dragIcon = event.image; |
| if (source != 0 && dragIcon != null) { |
| long pixbuf = ImageList.createPixbuf(dragIcon); |
| long texture = GDK.gdk_texture_new_for_pixbuf(pixbuf); |
| OS.g_object_unref(pixbuf); |
| GTK4.gtk_drag_source_set_icon(source, texture, 0, 0); |
| } |
| } |
| |
| static long dragPrepareProc(long source, double x, double y) { |
| long widgetHandle = GTK.gtk_event_controller_get_widget(source); |
| DragSource dragSource = FindDragSource(widgetHandle); |
| if (dragSource == null) return 0; |
| |
| return dragSource.dragPrepare(); |
| } |
| |
| long dragPrepare() { |
| TransferData transferData = new TransferData(); |
| |
| DNDEvent event = new DNDEvent(); |
| event.widget = this; |
| event.dataType = transferData; |
| notifyListeners(DND.DragSetData, event); |
| if (!event.doit) return 0; |
| |
| // TODO: Need to return GdkContentProvider for the data given from event.data |
| // Data from event.data also has to be converted to native through the Transfer class |
| return 0; |
| } |
| |
| static void dragEndProc(long source, long drag, boolean delete_data) { |
| |
| } |
| |
| static long DragBegin(long widget, long context){ |
| DragSource source = FindDragSource(widget); |
| if (source == null) return 0; |
| source.dragBegin(widget, context); |
| return 0; |
| } |
| |
| static long DragDataDelete(long widget, long context){ |
| DragSource source = FindDragSource(widget); |
| if (source == null) return 0; |
| source.dragDataDelete(widget, context); |
| return 0; |
| } |
| |
| static long DragEnd(long widget, long context){ |
| DragSource source = FindDragSource(widget); |
| if (source == null) return 0; |
| source.dragEnd(widget, context); |
| return 0; |
| } |
| |
| static long DragGetData(long widget, long context, long selection_data, long info, long time){ |
| DragSource source = FindDragSource(widget); |
| if (source == null) return 0; |
| source.dragGetData(widget, context, selection_data, (int)info, (int)time); |
| return 0; |
| } |
| |
| static DragSource FindDragSource(long 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 (DragSource)widget.getData(DND.DRAG_SOURCE_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>DragSourceListener</code> |
| * interface. |
| * |
| * <ul> |
| * <li><code>dragStart</code> is called when the user has begun the actions required to drag the widget. |
| * This event gives the application the chance to decide if a drag should be started. |
| * <li><code>dragSetData</code> is called when the data is required from the drag source. |
| * <li><code>dragFinished</code> is called when the drop has successfully completed (mouse up |
| * over a valid target) or has been terminated (such as hitting the ESC key). Perform cleanup |
| * such as removing data from the source side on a successful move operation. |
| * </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 DragSourceListener |
| * @see #getDragListeners |
| * @see #removeDragListener |
| * @see DragSourceEvent |
| */ |
| public void addDragListener(DragSourceListener listener) { |
| if (listener == null) DND.error (SWT.ERROR_NULL_ARGUMENT); |
| DNDListener typedListener = new DNDListener (listener); |
| typedListener.dndWidget = this; |
| addListener (DND.DragStart, typedListener); |
| addListener (DND.DragSetData, typedListener); |
| addListener (DND.DragEnd, typedListener); |
| } |
| |
| @Override |
| protected void checkSubclass () { |
| String name = getClass().getName (); |
| String validName = DragSource.class.getName(); |
| if (!validName.equals(name)) { |
| DND.error (SWT.ERROR_INVALID_SUBCLASS); |
| } |
| } |
| |
| void drag(Event dragEvent) { |
| moveData = false; |
| DNDEvent event = new DNDEvent(); |
| event.widget = this; |
| event.x = dragEvent.x; |
| event.y = dragEvent.y; |
| event.time = dragEvent.time; |
| event.doit = true; |
| notifyListeners(DND.DragStart, event); |
| if (!event.doit || transferAgents == null || transferAgents.length == 0) return; |
| if (targetList == 0) return; |
| |
| int actions = opToOsOp(getStyle()); |
| Image image = event.image; |
| long context; |
| context = GTK3.gtk_drag_begin_with_coordinates(control.handle, targetList, actions, 1, 0, -1, -1); |
| if (context != 0 && image != null) { |
| GTK3.gtk_drag_set_icon_surface(context, image.surface); |
| } |
| } |
| |
| void dragBegin(long widget, long context) { |
| /* |
| * Bug 515035: GTK DnD hijacks the D&D logic we have in SWT. |
| * When we recieve the signal from GTK of DragBegin, we will |
| * notify SWT that a drag has occurred. |
| */ |
| if (this.control instanceof Text) { |
| DNDEvent event = new DNDEvent(); |
| Display display = Display.getCurrent(); |
| Point loc = display.getCursorLocation(); |
| event.widget = this; |
| event.doit = true; |
| event.x = loc.x; |
| event.y = loc.y; |
| notifyListeners(DND.DragStart, event); |
| if (!event.doit || transferAgents == null || transferAgents.length == 0) return; |
| if (targetList == 0) return; |
| Image image = event.image; |
| if (context != 0 && image != null) { |
| GTK3.gtk_drag_set_icon_surface(context, image.surface); |
| } |
| } |
| } |
| |
| void dragEnd(long widget, long context){ |
| /* |
| * Bug in GTK. If a drag is initiated using gtk_drag_begin and the |
| * mouse is released immediately, the mouse and keyboard remain |
| * grabbed. The fix is to release the grab on the mouse and keyboard |
| * whenever the drag is terminated. |
| * |
| * NOTE: We believe that it is never an error to ungrab when |
| * a drag is finished. |
| */ |
| long display; |
| if (GTK.GTK4) { |
| long surface = GTK.gtk_native_get_surface(GTK.gtk_widget_get_native (widget)); |
| display = GDK.gdk_surface_get_display(surface); |
| } else { |
| display = GDK.gdk_window_get_display(GTK.gtk_widget_get_window(widget)); |
| } |
| long pointer = GDK.gdk_get_pointer(display); |
| |
| if (GTK.GTK4) { |
| //TODO: GTK4, ungrab keyboard seat if different from pointer's seat |
| } else { |
| long keyboard = GDK.gdk_device_get_associated_device(pointer); |
| long keyboard_seat = GDK.gdk_device_get_seat(keyboard); |
| GDK.gdk_seat_ungrab(keyboard_seat); |
| } |
| |
| long pointer_seat = GDK.gdk_device_get_seat(pointer); |
| GDK.gdk_seat_ungrab(pointer_seat); |
| |
| int operation = DND.DROP_NONE; |
| if (context != 0) { |
| long dest_window = 0; |
| int action = 0; |
| /* |
| * Feature in GTK: dest_window information is not gathered here in Wayland as the |
| * DragEnd signal does not give the correct destination window. GTK3.14+ with |
| * GTKGestures will handle file operations correctly without the |
| * gdk_drag_context_get_dest_window() call. See Bug 503431. |
| */ |
| action = GDK.gdk_drag_context_get_selected_action(context); |
| if (OS.isX11()) { // Wayland |
| dest_window = GDK.gdk_drag_context_get_dest_window(context); |
| } |
| if (dest_window != 0 || !OS.isX11()) { // Wayland. NOTE: if dest_window is 0, drag was aborted |
| if (moveData) { |
| operation = DND.DROP_MOVE; |
| } else { |
| operation = osOpToOp(action); |
| if (operation == DND.DROP_MOVE) operation = DND.DROP_NONE; |
| } |
| } |
| } |
| DNDEvent event = new DNDEvent(); |
| event.widget = this; |
| //event.time = ??? |
| event.doit = operation != 0; |
| event.detail = operation; |
| notifyListeners(DND.DragEnd, event); |
| |
| if (!OS.isX11()) { // Wayland |
| /* |
| * Feature in GTK: release events are not signaled during the dragEnd phrase of a Drag and Drop |
| * in Wayland. In order to work with the current logic for DnD in multiselection |
| * Widgets (tree, table, list), the selection function needs to be set back to |
| * true on dragEnd as well as release_event(). See bug 503431. |
| */ |
| if (this.control instanceof Table |
| || this.control instanceof Tree |
| || this.control instanceof List) { |
| long selection = GTK.gtk_tree_view_get_selection (widget); |
| GTK.gtk_tree_selection_set_select_function(selection,0,0,0); |
| } |
| |
| /* |
| * send a mouse Up signal for >GTK3.14 as Wayland (support as of 3.14) |
| * does not trigger a MouseUp/Mouse_release_event on DragEnd. |
| * See Bug 510446. |
| */ |
| control.notifyListeners(SWT.MouseUp, event); |
| } |
| moveData = false; |
| } |
| |
| void dragGetData(long widget, long context, long selection_data, int info, int time){ |
| if (selection_data == 0) return; |
| int length = GTK.gtk_selection_data_get_length(selection_data); |
| int format = GTK.gtk_selection_data_get_format(selection_data); |
| long data = GTK.gtk_selection_data_get_data(selection_data); |
| long target = GTK.gtk_selection_data_get_target(selection_data); |
| if (target == 0) return; |
| |
| TransferData transferData = new TransferData(); |
| transferData.type = target; |
| transferData.pValue = data; |
| transferData.length = length; |
| transferData.format = format; |
| |
| DNDEvent event = new DNDEvent(); |
| event.widget = this; |
| event.time = time; |
| event.dataType = transferData; |
| notifyListeners(DND.DragSetData, event); |
| if (!event.doit) return; |
| Transfer transfer = null; |
| for (int i = 0; i < transferAgents.length; i++) { |
| Transfer transferAgent = transferAgents[i]; |
| if (transferAgent != null && transferAgent.isSupportedType(transferData)) { |
| transfer = transferAgent; |
| break; |
| } |
| } |
| if (transfer == null) return; |
| transfer.javaToNative(event.data, transferData); |
| if (transferData.result != 1) return; |
| GTK.gtk_selection_data_set(selection_data, transferData.type, transferData.format, transferData.pValue, transferData.length); |
| OS.g_free(transferData.pValue); |
| return; |
| } |
| |
| void dragDataDelete(long widget, long context){ |
| moveData = true; |
| } |
| |
| /** |
| * Returns the Control which is registered for this DragSource. This is the control that the |
| * user clicks in to initiate dragging. |
| * |
| * @return the Control which is registered for this DragSource |
| */ |
| public Control getControl () { |
| return control; |
| } |
| |
| /** |
| * Returns an array of listeners who will be notified when a drag and drop |
| * operation is in progress, by sending it one of the messages defined in |
| * the <code>DragSourceListener</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 DragSourceListener |
| * @see #addDragListener |
| * @see #removeDragListener |
| * @see DragSourceEvent |
| * |
| * @since 3.4 |
| */ |
| public DragSourceListener[] getDragListeners() { |
| Listener[] listeners = getListeners(DND.DragStart); |
| int length = listeners.length; |
| DragSourceListener[] dragListeners = new DragSourceListener[length]; |
| int count = 0; |
| for (int i = 0; i < length; i++) { |
| Listener listener = listeners[i]; |
| if (listener instanceof DNDListener) { |
| dragListeners[count] = (DragSourceListener) ((DNDListener) listener).getEventListener(); |
| count++; |
| } |
| } |
| if (count == length) return dragListeners; |
| DragSourceListener[] result = new DragSourceListener[count]; |
| System.arraycopy(dragListeners, 0, result, 0, count); |
| return result; |
| } |
| |
| /** |
| * Returns the drag effect that is registered for this DragSource. This drag |
| * effect will be used during a drag and drop operation. |
| * |
| * @return the drag effect that is registered for this DragSource |
| * |
| * @since 3.3 |
| */ |
| public DragSourceEffect getDragSourceEffect() { |
| return dragEffect; |
| } |
| |
| /** |
| * Returns the list of data types that can be transferred by this DragSource. |
| * |
| * @return the list of data types that can be transferred by this DragSource |
| */ |
| public Transfer[] getTransfer(){ |
| return transferAgents; |
| } |
| |
| void onDispose() { |
| if (control == null) return; |
| if (targetList != 0) { |
| GTK3.gtk_target_list_unref(targetList); |
| } |
| targetList = 0; |
| if (controlListener != null) { |
| control.removeListener(SWT.Dispose, controlListener); |
| control.removeListener(SWT.DragDetect, controlListener); |
| } |
| controlListener = null; |
| control.setData(DND.DRAG_SOURCE_KEY, null); |
| control = null; |
| transferAgents = null; |
| } |
| |
| int opToOsOp(int operation){ |
| int osOperation = 0; |
| |
| if ((operation & DND.DROP_COPY) == DND.DROP_COPY) |
| osOperation |= GDK.GDK_ACTION_COPY; |
| if ((operation & DND.DROP_MOVE) == DND.DROP_MOVE) |
| osOperation |= GDK.GDK_ACTION_MOVE; |
| if ((operation & DND.DROP_LINK) == DND.DROP_LINK) |
| osOperation |= GDK.GDK_ACTION_LINK; |
| |
| return osOperation; |
| } |
| |
| int osOpToOp(int osOperation){ |
| int operation = DND.DROP_NONE; |
| |
| if ((osOperation & GDK.GDK_ACTION_COPY) == GDK.GDK_ACTION_COPY) |
| operation |= DND.DROP_COPY; |
| if ((osOperation & GDK.GDK_ACTION_MOVE) == GDK.GDK_ACTION_MOVE) |
| operation |= DND.DROP_MOVE; |
| if ((osOperation & GDK.GDK_ACTION_LINK) == GDK.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 DragSourceListener |
| * @see #addDragListener |
| * @see #getDragListeners |
| */ |
| public void removeDragListener(DragSourceListener listener) { |
| if (listener == null) DND.error (SWT.ERROR_NULL_ARGUMENT); |
| removeListener (DND.DragStart, listener); |
| removeListener (DND.DragSetData, listener); |
| removeListener (DND.DragEnd, listener); |
| } |
| |
| /** |
| * Specifies the drag effect for this DragSource. This drag effect will be |
| * used during a drag and drop operation. |
| * |
| * @param effect the drag effect that is registered for this DragSource |
| * |
| * @since 3.3 |
| */ |
| public void setDragSourceEffect(DragSourceEffect effect) { |
| dragEffect = effect; |
| } |
| |
| /** |
| * Specifies the list of data types that can be transferred by this DragSource. |
| * The application must be able to provide data to match each of these types when |
| * a successful drop has occurred. |
| * |
| * @param transferAgents a list of Transfer objects which define the types of data that can be |
| * dragged from this source |
| */ |
| public void setTransfer(Transfer... transferAgents){ |
| if (GTK.GTK4) { |
| this.transferAgents = transferAgents; |
| } else { |
| if (targetList != 0) { |
| GTK3.gtk_target_list_unref(targetList); |
| targetList = 0; |
| } |
| this.transferAgents = transferAgents; |
| if (transferAgents == null || transferAgents.length == 0) return; |
| |
| 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); |
| C.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 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); |
| } |
| targetList = GTK3.gtk_target_list_new(pTargets, targets.length); |
| |
| for (int i = 0; i < targets.length; i++) { |
| OS.g_free(targets[i].target); |
| } |
| } |
| } |
| } |