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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsDragService_h__
#define nsDragService_h__
#include "mozilla/RefPtr.h"
#include "nsBaseDragService.h"
#include "nsIObserver.h"
#include "nsAutoRef.h"
#include <gtk/gtk.h>
class nsWindow;
namespace mozilla {
namespace gfx {
class SourceSurface;
}
}
#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 final : public nsBaseDragService,
public nsIObserver
{
public:
nsDragService();
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSIOBSERVER
// nsBaseDragService
virtual nsresult InvokeDragSessionImpl(nsIArray* anArrayTransferables,
nsIScriptableRegion* aRegion,
uint32_t aActionType) override;
// nsIDragService
NS_IMETHOD InvokeDragSession (nsIDOMNode *aDOMNode,
nsIArray * anArrayTransferables,
nsIScriptableRegion * aRegion,
uint32_t aActionType,
nsContentPolicyType aContentPolicyType) override;
NS_IMETHOD StartDragSession() override;
NS_IMETHOD EndDragSession(bool aDoneDrag) override;
// nsIDragSession
NS_IMETHOD SetCanDrop (bool aCanDrop) override;
NS_IMETHOD GetCanDrop (bool *aCanDrop) override;
NS_IMETHOD GetNumDropItems (uint32_t * aNumItems) override;
NS_IMETHOD GetData (nsITransferable * aTransferable,
uint32_t aItemIndex) override;
NS_IMETHOD IsDataFlavorSupported (const char *aDataFlavor,
bool *_retval) override;
NS_IMETHOD UpdateDragEffect() override;
// 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,
mozilla::LayoutDeviceIntPoint aWindowPoint,
guint aTime);
void ScheduleLeaveEvent();
gboolean ScheduleDropEvent(nsWindow *aWindow,
GdkDragContext *aDragContext,
mozilla::LayoutDeviceIntPoint 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,
guint32 aTime);
// set the drag icon during drag-begin
void SetDragIcon(GdkDragContext* aContext);
protected:
virtual ~nsDragService();
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 nullptr if the scheduled task is eDragTaskLeave.
RefPtr<nsWindow> mPendingWindow;
mozilla::LayoutDeviceIntPoint 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.
RefPtr<nsWindow> mTargetWindow;
mozilla::LayoutDeviceIntPoint mTargetWindowPoint;
// mTargetWidget and mTargetDragContext are set only while dispatching
// motion or drop events. mTime records the corresponding timestamp.
nsCountedRef<GtkWidget> mTargetWidget;
nsCountedRef<GdkDragContext> mTargetDragContext;
// mTargetDragContextForRemote is set while waiting for a reply from
// a child process.
nsCountedRef<GdkDragContext> mTargetDragContextForRemote;
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;
uint32_t 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<nsIArray> 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(SourceSurface *aPixbuf,
GdkDragContext *aContext,
int32_t aXOffset,
int32_t aYOffset,
const mozilla::LayoutDeviceIntRect &dragRect);
gboolean Schedule(DragTask aTask, nsWindow *aWindow,
GdkDragContext *aDragContext,
mozilla::LayoutDeviceIntPoint 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(GdkDragContext* aDragContext);
gboolean DispatchDropEvent();
};
#endif // nsDragService_h__
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