зеркало из https://github.com/mozilla/pjs.git
241 строка
9.0 KiB
C++
241 строка
9.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:expandtab:shiftwidth=4:tabstop=4:
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Christopher Blizzard <blizzard@mozilla.org>.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Christopher Blizzard <blizzard@mozilla.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsDragService_h__
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#define nsDragService_h__
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#include "nsBaseDragService.h"
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#include "nsIObserver.h"
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#include <gtk/gtk.h>
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class nsWindow;
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#ifndef HAVE_NSGOBJECTREFTRAITS
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#define HAVE_NSGOBJECTREFTRAITS
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template <class T>
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class nsGObjectRefTraits : public nsPointerRefTraits<T> {
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public:
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static void Release(T *aPtr) { g_object_unref(aPtr); }
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static void AddRef(T *aPtr) { g_object_ref(aPtr); }
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};
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#endif
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#ifndef HAVE_NSAUTOREFTRAITS_GTKWIDGET
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#define HAVE_NSAUTOREFTRAITS_GTKWIDGET
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template <>
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class nsAutoRefTraits<GtkWidget> : public nsGObjectRefTraits<GtkWidget> { };
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#endif
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#ifndef HAVE_NSAUTOREFTRAITS_GDKDRAGCONTEXT
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#define HAVE_NSAUTOREFTRAITS_GDKDRAGCONTEXT
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template <>
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class nsAutoRefTraits<GdkDragContext> :
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public nsGObjectRefTraits<GdkDragContext> { };
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#endif
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/**
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* Native GTK DragService wrapper
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*/
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class nsDragService : public nsBaseDragService,
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public nsIObserver
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{
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public:
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nsDragService();
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virtual ~nsDragService();
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_NSIOBSERVER
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// nsIDragService
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NS_IMETHOD InvokeDragSession (nsIDOMNode *aDOMNode,
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nsISupportsArray * anArrayTransferables,
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nsIScriptableRegion * aRegion,
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PRUint32 aActionType);
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NS_IMETHOD StartDragSession();
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NS_IMETHOD EndDragSession(bool aDoneDrag);
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// nsIDragSession
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NS_IMETHOD SetCanDrop (bool aCanDrop);
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NS_IMETHOD GetCanDrop (bool *aCanDrop);
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NS_IMETHOD GetNumDropItems (PRUint32 * aNumItems);
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NS_IMETHOD GetData (nsITransferable * aTransferable,
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PRUint32 aItemIndex);
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NS_IMETHOD IsDataFlavorSupported (const char *aDataFlavor, bool *_retval);
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// Methods called from nsWindow to handle responding to GTK drag
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// destination signals
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static nsDragService* GetInstance();
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void TargetDataReceived (GtkWidget *aWidget,
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GdkDragContext *aContext,
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gint aX,
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gint aY,
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GtkSelectionData *aSelection_data,
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guint aInfo,
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guint32 aTime);
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gboolean ScheduleMotionEvent(nsWindow *aWindow,
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GdkDragContext *aDragContext,
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nsIntPoint aWindowPoint,
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guint aTime);
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void ScheduleLeaveEvent();
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gboolean ScheduleDropEvent(nsWindow *aWindow,
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GdkDragContext *aDragContext,
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nsIntPoint aWindowPoint,
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guint aTime);
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nsWindow* GetMostRecentDestWindow()
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{
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return mScheduledTask == eDragTaskNone ? mTargetWindow
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: mPendingWindow;
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}
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// END PUBLIC API
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// These methods are public only so that they can be called from functions
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// with C calling conventions. They are called for drags started with the
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// invisible widget.
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void SourceEndDragSession(GdkDragContext *aContext,
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gint aResult);
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void SourceDataGet(GtkWidget *widget,
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GdkDragContext *context,
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GtkSelectionData *selection_data,
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guint info,
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guint32 aTime);
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// set the drag icon during drag-begin
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void SetDragIcon(GdkDragContext* aContext);
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private:
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// mScheduledTask indicates what signal has been received from GTK and
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// so what needs to be dispatched when the scheduled task is run. It is
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// eDragTaskNone when there is no task scheduled (but the
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// previous task may still not have finished running).
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enum DragTask {
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eDragTaskNone,
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eDragTaskMotion,
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eDragTaskLeave,
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eDragTaskDrop,
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eDragTaskSourceEnd
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};
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DragTask mScheduledTask;
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// mTaskSource is the GSource id for the task that is either scheduled
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// or currently running. It is 0 if no task is scheduled or running.
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guint mTaskSource;
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// target/destination side vars
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// These variables keep track of the state of the current drag.
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// mPendingWindow, mPendingWindowPoint, mPendingDragContext, and
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// mPendingTime, carry information from the GTK signal that will be used
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// when the scheduled task is run. mPendingWindow and mPendingDragContext
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// will be NULL if the scheduled task is eDragTaskLeave.
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nsRefPtr<nsWindow> mPendingWindow;
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nsIntPoint mPendingWindowPoint;
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nsCountedRef<GdkDragContext> mPendingDragContext;
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guint mPendingTime;
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// mTargetWindow and mTargetWindowPoint record the position of the last
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// eDragTaskMotion or eDragTaskDrop task that was run or is still running.
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// mTargetWindow is cleared once the drag has completed or left.
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nsRefPtr<nsWindow> mTargetWindow;
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nsIntPoint mTargetWindowPoint;
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// mTargetWidget and mTargetDragContext are set only while dispatching
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// motion or drop events. mTime records the corresponding timestamp.
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nsCountedRef<GtkWidget> mTargetWidget;
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nsCountedRef<GdkDragContext> mTargetDragContext;
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guint mTargetTime;
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// is it OK to drop on us?
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bool mCanDrop;
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// have we received our drag data?
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bool mTargetDragDataReceived;
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// last data received and its length
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void *mTargetDragData;
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PRUint32 mTargetDragDataLen;
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// is the current target drag context contain a list?
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bool IsTargetContextList(void);
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// this will get the native data from the last target given a
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// specific flavor
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void GetTargetDragData(GdkAtom aFlavor);
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// this will reset all of the target vars
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void TargetResetData(void);
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// source side vars
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// the source of our drags
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GtkWidget *mHiddenWidget;
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// our source data items
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nsCOMPtr<nsISupportsArray> mSourceDataItems;
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nsCOMPtr<nsIScriptableRegion> mSourceRegion;
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// get a list of the sources in gtk's format
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GtkTargetList *GetSourceList(void);
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// attempts to create a semi-transparent drag image. Returns TRUE if
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// successful, FALSE if not
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bool SetAlphaPixmap(gfxASurface *aPixbuf,
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GdkDragContext *aContext,
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PRInt32 aXOffset,
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PRInt32 aYOffset,
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const nsIntRect &dragRect);
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gboolean Schedule(DragTask aTask, nsWindow *aWindow,
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GdkDragContext *aDragContext,
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nsIntPoint aWindowPoint, guint aTime);
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// Callback for g_idle_add_full() to run mScheduledTask.
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static gboolean TaskDispatchCallback(gpointer data);
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gboolean RunScheduledTask();
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void UpdateDragAction();
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void DispatchMotionEvents();
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void ReplyToDragMotion();
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gboolean DispatchDropEvent();
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};
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#endif // nsDragService_h__
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