Mercurial > projects > dwt-linux
view dwt/dnd/DropTarget.d @ 259:c0d810de7093
Update SWT 3.4M7 to 3.4
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 29 Jun 2008 14:33:38 +0200 |
parents | ce446666f5a2 |
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/******************************************************************************* * Copyright (c) 2000, 2008 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 * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.dnd.DropTarget; import dwt.DWT; import dwt.DWTError; import dwt.DWTException; import dwt.graphics.Point; import dwt.internal.gtk.OS; import dwt.widgets.Combo; import dwt.widgets.Control; import dwt.widgets.Display; import dwt.widgets.Event; import dwt.widgets.Listener; import dwt.widgets.Table; import dwt.widgets.Tree; import dwt.widgets.Widget; import dwt.dnd.DND; import dwt.dnd.Transfer; import dwt.dnd.DropTargetEffect; import dwt.dnd.DNDEvent; import dwt.dnd.DNDListener; import dwt.dnd.TransferData; import dwt.dnd.DropTargetListener; import dwt.dnd.TableDropTargetEffect; import dwt.dnd.TreeDropTargetEffect; import dwt.dwthelper.utils; import dwt.dwthelper.Runnable; import tango.core.Thread; static import tango.stdc.string; /** * * Class <code>DropTarget</code> defines the target object for a drag and drop transfer. * * IMPORTANT: This class is <em>not</em> intended to be subclassed. * * <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 is 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">DWT Example: DNDExample</a> * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> */ public class DropTarget : Widget { Control control; Listener controlListener; Transfer[] transferAgents; 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 const String DEFAULT_DROP_TARGET_EFFECT = "DEFAULT_DROP_TARGET_EFFECT"; //$NON-NLS-1$ static const int DRAGOVER_HYSTERESIS = 50; // static Callback Drag_Motion; // static Callback Drag_Leave; // static Callback Drag_Data_Received; // static Callback Drag_Drop; // // static this(){ // Drag_Motion = new Callback(DropTarget.class, "Drag_Motion", 5); //$NON-NLS-1$ // if (Drag_Motion.getAddress() is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS); // Drag_Leave = new Callback(DropTarget.class, "Drag_Leave", 3); //$NON-NLS-1$ // if (Drag_Leave.getAddress() is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS); // Drag_Data_Received = new Callback(DropTarget.class, "Drag_Data_Received", 7); //$NON-NLS-1$ // if (Drag_Data_Received.getAddress() is 0) DWT.error(DWT.ERROR_NO_MORE_CALLBACKS); // Drag_Drop = new Callback(DropTarget.class, "Drag_Drop", 5); //$NON-NLS-1$ // if (Drag_Drop.getAddress() is 0) DWT.error(DWT.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 DWTException <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 DWTError <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 DWTException, 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 this(Control control, int style) { super(control, checkStyle(style)); this.control = control; // if (Drag_Motion is null || Drag_Leave is null || Drag_Data_Received is null || Drag_Drop is null) { // DND.error(DND.ERROR_CANNOT_INIT_DROP); // } if (control.getData(DND.DROP_TARGET_KEY) !is 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.ptr, cast(GCallback)&Drag_Motion, null); drag_leave_handler = OS.g_signal_connect(control.handle, OS.drag_leave.ptr, cast(GCallback)&Drag_Leave, null); drag_data_received_handler = OS.g_signal_connect(control.handle, OS.drag_data_received.ptr, cast(GCallback)&Drag_Data_Received, null); drag_drop_handler = OS.g_signal_connect(control.handle, OS.drag_drop.ptr, cast(GCallback)&Drag_Drop, null); // Dispose listeners controlListener = new class() Listener{ public void handleEvent(Event event){ if (!this.outer.isDisposed()){ this.outer.dispose(); } } }; control.addListener(DWT.Dispose, controlListener); this.addListener(DWT.Dispose, new class() Listener { public void handleEvent(Event event){ onDispose(); } }); Object effect = control.getData(DEFAULT_DROP_TARGET_EFFECT); if ( auto de = cast(DropTargetEffect)effect ) { dropEffect = de; } else if ( auto table = cast(Table)control ) { dropEffect = new TableDropTargetEffect(table); } else if ( auto tree = cast(Tree) control ) { dropEffect = new TreeDropTargetEffect(tree); } dragOverHeartbeat = new class() Runnable { public void run() { Control control = this.outer.control; if (control is null || control.isDisposed() || dragOverStart is 0) return; long time = System.currentTimeMillis(); int delay = DRAGOVER_HYSTERESIS; if (time < dragOverStart) { delay = cast(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 !is null) { event.item = dropEffect.getItem(dragOverEvent.x, dragOverEvent.y); } selectedDataType = null; selectedOperation = DND.DROP_NONE; notifyListeners(DND.DragOver, event); if (event.dataType !is null) { for (int i = 0; i < allowedTypes.length; i++) { if (allowedTypes[i].type is event.dataType.type) { selectedDataType = event.dataType; break; } } } if (selectedDataType !is null && (event.detail & allowedOperations) !is 0) { selectedOperation = event.detail; } } control = this.outer.control; if (control is null || control.isDisposed()) return; control.getDisplay().timerExec(delay, dragOverHeartbeat); } }; } static int checkStyle (int style) { if (style is DWT.NONE) return DND.DROP_MOVE; return style; } private static extern(C) void Drag_Data_Received ( GtkWidget *widget, GdkDragContext *context, int x, int y, GtkSelectionData *data, uint info, uint time, void* user_data) { DropTarget target = FindDropTarget(widget); if (target is null) return; target.drag_data_received (widget, context, cast(int)/*64*/x, cast(int)/*64*/y, data, cast(int)/*64*/info, cast(int)/*64*/time); } private static extern(C) int Drag_Drop( GtkWidget *widget, GdkDragContext *context, int x, int y, uint time, void* user_data) { DropTarget target = FindDropTarget(widget); if (target is null) return 0; return target.drag_drop (widget, context, cast(int)/*64*/x, cast(int)/*64*/y, cast(int)/*64*/time) ? 1 : 0; } private static extern(C) void Drag_Leave ( GtkWidget *widget, GdkDragContext *context, uint time, void* user_data) { DropTarget target = FindDropTarget(widget); if (target is null) return; target.drag_leave (widget, context, cast(int)/*64*/time); } private static extern(C) int Drag_Motion ( GtkWidget *widget, GdkDragContext *context, int x, int y, uint time, void* user_data) { DropTarget target = FindDropTarget(widget); if (target is null) return 0; return target.drag_motion (widget, context, cast(int)/*64*/x, cast(int)/*64*/y, cast(int)/*64*/time) ? 1 : 0; } static DropTarget FindDropTarget(GtkWidget* handle) { Display display = Display.findDisplay(Thread.getThis()); if (display is null || display.isDisposed()) return null; Widget widget = display.findWidget(handle); if (widget is null) return null; return cast(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 DWTException <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 is null) DND.error (DWT.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); } protected override void checkSubclass () { String name = this.classinfo.name; String validName = DropTarget.classinfo.name; if ( validName !=/*eq*/ name ) { DND.error (DWT.ERROR_INVALID_SUBCLASS); } } void drag_data_received ( GtkWidget *widget, GdkDragContext *context, int x, int y, GtkSelectionData *data, uint info, uint time ) { DNDEvent event = new DNDEvent(); if (data is null || !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(); if (data.data !is null) { transferData.type = data.type; transferData.length = data.length; transferData.pValue = data.data; transferData.format = data.format; for (int i = 0; i < transferAgents.length; i++) { Transfer transfer = transferAgents[i]; if (transfer !is null && transfer.isSupportedType(transferData)) { object = transfer.nativeToJava(transferData); break; } } } if (object is 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) is event.detail) { selectedOperation = event.detail; } //stop native handler OS.g_signal_stop_emission_by_name(widget, OS.drag_data_received.ptr); //notify source of action taken OS.gtk_drag_finish(context, selectedOperation !is DND.DROP_NONE, selectedOperation is DND.DROP_MOVE, time); return; } bool drag_drop( GtkWidget *widget, GdkDragContext *context, int x, int y, uint 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 !is null) { for (int i = 0; i < allowedDataTypes.length; i++) { if (allowedDataTypes[i].type is event.dataType.type) { selectedDataType = allowedDataTypes[i]; break; } } } if (selectedDataType !is null && ((event.detail & allowedOperations) is event.detail)) { selectedOperation = event.detail; } if (selectedOperation is 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( GtkWidget *widget, GdkDragContext *context, uint time ) { updateDragOverHover(0, null); if (keyOperation is -1) return; keyOperation = -1; DNDEvent event = new DNDEvent(); event.widget = this; event.time = time; event.detail = DND.DROP_NONE; notifyListeners(DND.DragLeave, event); } bool drag_motion ( GtkWidget *widget, GdkDragContext *context, int x, int y, uint time) { int oldKeyOperation = keyOperation; if (oldKeyOperation is -1) { //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 is -1) { event.type = DND.DragEnter; } else { if (keyOperation is 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 is DND.DROP_DEFAULT) { event.detail = (allowedOperations & DND.DROP_MOVE) !is 0 ? DND.DROP_MOVE : DND.DROP_NONE; } if (event.dataType !is null) { for (int i = 0; i < allowedDataTypes.length; i++) { if (allowedDataTypes[i].type is event.dataType.type) { selectedDataType = allowedDataTypes[i]; break; } } } if (selectedDataType !is null && (allowedOperations & event.detail) !is 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; default: } if (oldKeyOperation is -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 DWTException <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 ( auto l = cast(DNDListener)listener ) { dropListeners[count] = cast(DropTargetListener) (l.getEventListener()); count++; } } if (count is length) return dropListeners; DropTargetListener[] result = new DropTargetListener[count]; SimpleType!(DropTargetListener).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; OS.gdk_window_get_pointer(null, null, null, &state); bool ctrl = (state & OS.GDK_CONTROL_MASK) !is 0; bool shift = (state & OS.GDK_SHIFT_MASK) !is 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 is 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 !is 0) OS.gtk_drag_dest_unset(control.handle); transferAgents = null; if (controlListener !is null) control.removeListener(DWT.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) is DND.DROP_COPY) osOperation |= OS.GDK_ACTION_COPY; if ((operation & DND.DROP_MOVE) is DND.DROP_MOVE) osOperation |= OS.GDK_ACTION_MOVE; if ((operation & DND.DROP_LINK) is 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) is OS.GDK_ACTION_COPY) operation |= DND.DROP_COPY; if ((osOperation & OS.GDK_ACTION_MOVE) is OS.GDK_ACTION_MOVE) operation |= DND.DROP_MOVE; if ((osOperation & OS.GDK_ACTION_LINK) is 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 DWTException <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 is null) DND.error (DWT.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 is null) DND.error(DWT.ERROR_NULL_ARGUMENT); if (this.transferAgents.length !is 0) { OS.gtk_drag_dest_unset(control.handle); } this.transferAgents = transferAgents; GtkTargetEntry*[] targets; for (int i = 0; i < transferAgents.length; i++) { Transfer transfer = transferAgents[i]; if (transfer !is null) { int[] typeIds = transfer.getTypeIds(); String[] typeNames = transfer.getTypeNames(); for (int j = 0; j < typeIds.length; j++) { GtkTargetEntry* entry = new GtkTargetEntry(); entry.target = cast(char*)OS.g_malloc(typeNames[j].length +1); entry.target[ 0 .. typeNames[j].length ] = typeNames[j]; entry.target[ typeNames[j].length ] = '\0'; entry.info = typeIds[j]; GtkTargetEntry*[] newTargets = new GtkTargetEntry*[targets.length + 1]; SimpleType!(GtkTargetEntry*).arraycopy(targets, 0, newTargets, 0, targets.length); newTargets[targets.length] = entry; targets = newTargets; } } } auto pTargets = OS.g_malloc(targets.length * GtkTargetEntry.sizeof); for (int i = 0; i < targets.length; i++) { tango.stdc.string.memmove(pTargets + i*GtkTargetEntry.sizeof, targets[i], GtkTargetEntry.sizeof); } int actions = opToOsOp(getStyle()); if ( auto c = cast(Combo)control ) { if ((control.getStyle() & DWT.READ_ONLY) is 0) { auto entryHandle = OS.gtk_bin_get_child (control.handle); if (entryHandle !is null) { 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; } bool setEventData(GdkDragContext* dragContext, int x, int y, int time, DNDEvent event) { if (dragContext is null) return false; if (dragContext.targets is null) return false; // get allowed operations int style = getStyle(); int operations = osOpToOp(dragContext.actions) & style; if (operations is DND.DROP_NONE) return false; // get current operation int operation = getOperationFromKeyState(); keyOperation = operation; if (operation is DND.DROP_DEFAULT) { if ((style & DND.DROP_DEFAULT) is 0) { operation = (operations & DND.DROP_MOVE) !is 0 ? DND.DROP_MOVE : DND.DROP_NONE; } } else { if ((operation & operations) is 0) operation = DND.DROP_NONE; } // Get allowed transfer types int length = OS.g_list_length(dragContext.targets); TransferData[] dataTypes = new TransferData[0]; for (int i = 0; i < length; i++) { auto pData = OS.g_list_nth(dragContext.targets, i); GtkTargetPair* gtkTargetPair = cast(GtkTargetPair*)pData; TransferData data = new TransferData(); data.type = gtkTargetPair.target; for (int j = 0; j < transferAgents.length; j++) { Transfer transfer = transferAgents[j]; if (transfer !is 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; } } } if (dataTypes.length is 0) return false; auto window = OS.GTK_WIDGET_WINDOW(control.handle); int origin_x, origin_y; OS.gdk_window_get_origin(window, &origin_x, &origin_y); Point coordinates = new Point(origin_x + x, origin_y + 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 !is null) { event.item = dropEffect.getItem(coordinates.x, coordinates.y); } return true; } void updateDragOverHover(long delay, DNDEvent event) { if (delay is 0) { dragOverStart = 0; dragOverEvent = null; return; } dragOverStart = System.currentTimeMillis() + delay; if (dragOverEvent is 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; } }