pjs/widget/gtk2/nsDragService.h

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