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150 lines
4.7 KiB
C++
150 lines
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsBaseDragService_h__
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#define nsBaseDragService_h__
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#include "nsIDragService.h"
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#include "nsIDragSession.h"
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#include "nsITransferable.h"
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#include "nsISupportsArray.h"
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#include "nsIDOMDocument.h"
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#include "nsIDOMDataTransfer.h"
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#include "nsIContent.h"
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#include "nsCOMPtr.h"
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#include "nsPoint.h"
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#include "gfxImageSurface.h"
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// translucency level for drag images
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#define DRAG_TRANSLUCENCY 0.65
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class nsIDOMNode;
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class nsIFrame;
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class nsPresContext;
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class nsIImageLoadingContent;
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class nsICanvasElementExternal;
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/**
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* XP DragService wrapper base class
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*/
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class nsBaseDragService : public nsIDragService,
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public nsIDragSession
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{
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public:
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nsBaseDragService();
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virtual ~nsBaseDragService();
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//nsISupports
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NS_DECL_ISUPPORTS
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//nsIDragSession and nsIDragService
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NS_DECL_NSIDRAGSERVICE
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NS_DECL_NSIDRAGSESSION
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void SetDragEndPoint(nsIntPoint aEndDragPoint) { mEndDragPoint = aEndDragPoint; }
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PRUint16 GetInputSource() { return mInputSource; }
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protected:
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/**
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* Draw the drag image, if any, to a surface and return it. The drag image
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* is constructed from mImage if specified, or aDOMNode if mImage is null.
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*
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* aRegion may be used to draw only a subset of the element. This region
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* should be supplied using x and y coordinates measured in css pixels
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* that are relative to the upper-left corner of the window.
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*
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* aScreenX and aScreenY should be the screen coordinates of the mouse click
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* for the drag.
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*
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* On return, aScreenDragRect will contain the screen coordinates of the
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* area being dragged. This is used by the platform-specific part of the
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* drag service to determine the drag feedback.
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*
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* If there is no drag image, the returned surface will be null, but
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* aScreenDragRect will still be set to the drag area.
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*
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* aPresContext will be set to the nsPresContext used determined from
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* whichever of mImage or aDOMNode is used.
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*/
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nsresult DrawDrag(nsIDOMNode* aDOMNode,
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nsIScriptableRegion* aRegion,
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PRInt32 aScreenX, PRInt32 aScreenY,
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nsIntRect* aScreenDragRect,
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gfxASurface** aSurface,
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nsPresContext **aPresContext);
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/**
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* Draw a drag image for an image node specified by aImageLoader or aCanvas.
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* This is called by DrawDrag.
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*/
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nsresult DrawDragForImage(nsPresContext* aPresContext,
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nsIImageLoadingContent* aImageLoader,
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nsICanvasElementExternal* aCanvas,
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PRInt32 aScreenX, PRInt32 aScreenY,
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nsIntRect* aScreenDragRect,
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gfxASurface** aSurface);
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/**
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* Convert aScreenX and aScreenY from CSS pixels into unscaled device pixels.
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*/
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void
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ConvertToUnscaledDevPixels(nsPresContext* aPresContext,
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PRInt32* aScreenX, PRInt32* aScreenY);
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/**
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* If the drag image is a popup, open the popup when the drag begins.
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*/
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void OpenDragPopup();
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bool mCanDrop;
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bool mOnlyChromeDrop;
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bool mDoingDrag;
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// true if mImage should be used to set a drag image
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bool mHasImage;
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// true if the user cancelled the drag operation
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bool mUserCancelled;
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PRUint32 mDragAction;
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nsSize mTargetSize;
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nsCOMPtr<nsIDOMNode> mSourceNode;
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nsCOMPtr<nsIDOMDocument> mSourceDocument; // the document at the drag source. will be null
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// if it came from outside the app.
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nsCOMPtr<nsIDOMDataTransfer> mDataTransfer;
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// used to determine the image to appear on the cursor while dragging
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nsCOMPtr<nsIDOMNode> mImage;
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// offset of cursor within the image
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PRInt32 mImageX;
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PRInt32 mImageY;
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// set if a selection is being dragged
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nsCOMPtr<nsISelection> mSelection;
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// set if the image in mImage is a popup. If this case, the popup will be opened
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// and moved instead of using a drag image.
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nsCOMPtr<nsIContent> mDragPopup;
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// the screen position where drag gesture occurred, used for positioning the
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// drag image when no image is specified. If a value is -1, no event was
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// supplied so the screen position is not known
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PRInt32 mScreenX;
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PRInt32 mScreenY;
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// the screen position where the drag ended
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nsIntPoint mEndDragPoint;
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PRUint32 mSuppressLevel;
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// The input source of the drag event. Possible values are from nsIDOMMouseEvent.
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PRUint16 mInputSource;
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};
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#endif // nsBaseDragService_h__
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