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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsBaseDragService_h__
#define nsBaseDragService_h__
#include "nsIDragService.h"
#include "nsIDragSession.h"
#include "nsITransferable.h"
#include "nsIDOMDocument.h"
#include "nsIDOMDataTransfer.h"
#include "nsCOMPtr.h"
#include "nsRect.h"
#include "nsPoint.h"
#include "mozilla/RefPtr.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "nsTArray.h"
#include "Units.h"
// translucency level for drag images
#define DRAG_TRANSLUCENCY 0.65
class nsIContent;
class nsIDOMNode;
class nsPresContext;
class nsIImageLoadingContent;
namespace mozilla {
namespace gfx {
class SourceSurface;
} // namespace gfx
} // namespace mozilla
/**
* XP DragService wrapper base class
*/
class nsBaseDragService : public nsIDragService,
public nsIDragSession
{
public:
typedef mozilla::gfx::SourceSurface SourceSurface;
nsBaseDragService();
//nsISupports
NS_DECL_ISUPPORTS
//nsIDragSession and nsIDragService
NS_DECL_NSIDRAGSERVICE
NS_DECL_NSIDRAGSESSION
void SetDragEndPoint(nsIntPoint aEndDragPoint)
{
mEndDragPoint = mozilla::LayoutDeviceIntPoint::FromUnknownPoint(aEndDragPoint);
}
void SetDragEndPoint(mozilla::LayoutDeviceIntPoint aEndDragPoint)
{
mEndDragPoint = aEndDragPoint;
}
uint16_t GetInputSource() { return mInputSource; }
int32_t TakeChildProcessDragAction();
protected:
virtual ~nsBaseDragService();
/**
* Called from nsBaseDragService to initiate a platform drag from a source
* in this process. This is expected to ensure that StartDragSession() and
* EndDragSession() get called if the platform drag is successfully invoked.
*/
virtual nsresult InvokeDragSessionImpl(nsIArray* aTransferableArray,
nsIScriptableRegion* aDragRgn,
uint32_t aActionType) = 0;
/**
* Draw the drag image, if any, to a surface and return it. The drag image
* is constructed from mImage if specified, or aDOMNode if mImage is null.
*
* aRegion may be used to draw only a subset of the element. This region
* should be supplied using x and y coordinates measured in css pixels
* that are relative to the upper-left corner of the window.
*
* aScreenPosition should be the screen coordinates of the mouse click
* for the drag. These are in CSS pixels.
*
* On return, aScreenDragRect will contain the screen coordinates of the
* area being dragged. This is used by the platform-specific part of the
* drag service to determine the drag feedback. This rect will be in the
* device pixels of the presContext.
*
* If there is no drag image, the returned surface will be null, but
* aScreenDragRect will still be set to the drag area.
*
* aPresContext will be set to the nsPresContext used determined from
* whichever of mImage or aDOMNode is used.
*/
nsresult DrawDrag(nsIDOMNode* aDOMNode,
nsIScriptableRegion* aRegion,
mozilla::CSSIntPoint aScreenPosition,
mozilla::LayoutDeviceIntRect* aScreenDragRect,
RefPtr<SourceSurface>* aSurface,
nsPresContext **aPresContext);
/**
* Draw a drag image for an image node specified by aImageLoader or aCanvas.
* This is called by DrawDrag.
*/
nsresult DrawDragForImage(nsPresContext *aPresContext,
nsIImageLoadingContent* aImageLoader,
mozilla::dom::HTMLCanvasElement* aCanvas,
mozilla::LayoutDeviceIntRect* aScreenDragRect,
RefPtr<SourceSurface>* aSurface);
/**
* Convert aScreenPosition from CSS pixels into unscaled device pixels.
*/
mozilla::LayoutDeviceIntPoint
ConvertToUnscaledDevPixels(nsPresContext* aPresContext,
mozilla::CSSIntPoint aScreenPosition);
/**
* If the drag image is a popup, open the popup when the drag begins.
*/
void OpenDragPopup();
/**
* Free resources contained in DataTransferItems that aren't needed by JS.
*/
void DiscardInternalTransferData();
// Returns true if a drag event was dispatched to a child process after
// the previous TakeDragEventDispatchedToChildProcess() call.
bool TakeDragEventDispatchedToChildProcess()
{
bool retval = mDragEventDispatchedToChildProcess;
mDragEventDispatchedToChildProcess = false;
return retval;
}
bool mCanDrop;
bool mOnlyChromeDrop;
bool mDoingDrag;
// true if mImage should be used to set a drag image
bool mHasImage;
// true if the user cancelled the drag operation
bool mUserCancelled;
bool mDragEventDispatchedToChildProcess;
uint32_t mDragAction;
uint32_t mDragActionFromChildProcess;
nsSize mTargetSize;
nsCOMPtr<nsIDOMNode> mSourceNode;
nsCOMPtr<nsIDOMDocument> mSourceDocument; // the document at the drag source. will be null
// if it came from outside the app.
nsContentPolicyType mContentPolicyType; // the contentpolicy type passed to the channel
// when initiating the drag session
nsCOMPtr<nsIDOMDataTransfer> mDataTransfer;
// used to determine the image to appear on the cursor while dragging
nsCOMPtr<nsIDOMNode> mImage;
// offset of cursor within the image
mozilla::CSSIntPoint mImageOffset;
// set if a selection is being dragged
nsCOMPtr<nsISelection> mSelection;
// set if the image in mImage is a popup. If this case, the popup will be opened
// and moved instead of using a drag image.
nsCOMPtr<nsIContent> mDragPopup;
// the screen position where drag gesture occurred, used for positioning the
// drag image.
mozilla::CSSIntPoint mScreenPosition;
// the screen position where the drag ended
mozilla::LayoutDeviceIntPoint mEndDragPoint;
uint32_t mSuppressLevel;
// The input source of the drag event. Possible values are from nsIDOMMouseEvent.
uint16_t mInputSource;
nsTArray<RefPtr<mozilla::dom::ContentParent>> mChildProcesses;
};
#endif // nsBaseDragService_h__
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