1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/xpwidgets/nsBaseDragService.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,158 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef nsBaseDragService_h__
1.10 +#define nsBaseDragService_h__
1.11 +
1.12 +#include "nsIDragService.h"
1.13 +#include "nsIDragSession.h"
1.14 +#include "nsITransferable.h"
1.15 +#include "nsIDOMDocument.h"
1.16 +#include "nsIDOMDataTransfer.h"
1.17 +#include "nsCOMPtr.h"
1.18 +#include "nsRect.h"
1.19 +#include "nsPoint.h"
1.20 +#include "mozilla/RefPtr.h"
1.21 +#include "mozilla/dom/HTMLCanvasElement.h"
1.22 +
1.23 +// translucency level for drag images
1.24 +#define DRAG_TRANSLUCENCY 0.65
1.25 +
1.26 +class nsIContent;
1.27 +class nsIDOMNode;
1.28 +class nsIFrame;
1.29 +class nsPresContext;
1.30 +class nsIImageLoadingContent;
1.31 +class nsICanvasElementExternal;
1.32 +
1.33 +namespace mozilla {
1.34 +namespace gfx {
1.35 +class SourceSurface;
1.36 +}
1.37 +}
1.38 +
1.39 +/**
1.40 + * XP DragService wrapper base class
1.41 + */
1.42 +
1.43 +class nsBaseDragService : public nsIDragService,
1.44 + public nsIDragSession
1.45 +{
1.46 +
1.47 +public:
1.48 + typedef mozilla::gfx::SourceSurface SourceSurface;
1.49 +
1.50 + nsBaseDragService();
1.51 + virtual ~nsBaseDragService();
1.52 +
1.53 + //nsISupports
1.54 + NS_DECL_ISUPPORTS
1.55 +
1.56 + //nsIDragSession and nsIDragService
1.57 + NS_DECL_NSIDRAGSERVICE
1.58 + NS_DECL_NSIDRAGSESSION
1.59 +
1.60 + void SetDragEndPoint(nsIntPoint aEndDragPoint) { mEndDragPoint = aEndDragPoint; }
1.61 +
1.62 + uint16_t GetInputSource() { return mInputSource; }
1.63 +
1.64 +protected:
1.65 +
1.66 + /**
1.67 + * Draw the drag image, if any, to a surface and return it. The drag image
1.68 + * is constructed from mImage if specified, or aDOMNode if mImage is null.
1.69 + *
1.70 + * aRegion may be used to draw only a subset of the element. This region
1.71 + * should be supplied using x and y coordinates measured in css pixels
1.72 + * that are relative to the upper-left corner of the window.
1.73 + *
1.74 + * aScreenX and aScreenY should be the screen coordinates of the mouse click
1.75 + * for the drag. These are in global display pixels.
1.76 + *
1.77 + * On return, aScreenDragRect will contain the screen coordinates of the
1.78 + * area being dragged. This is used by the platform-specific part of the
1.79 + * drag service to determine the drag feedback. This rect will be in the
1.80 + * device pixels of the presContext.
1.81 + *
1.82 + * If there is no drag image, the returned surface will be null, but
1.83 + * aScreenDragRect will still be set to the drag area.
1.84 + *
1.85 + * aPresContext will be set to the nsPresContext used determined from
1.86 + * whichever of mImage or aDOMNode is used.
1.87 + */
1.88 + nsresult DrawDrag(nsIDOMNode* aDOMNode,
1.89 + nsIScriptableRegion* aRegion,
1.90 + int32_t aScreenX, int32_t aScreenY,
1.91 + nsIntRect* aScreenDragRect,
1.92 + mozilla::RefPtr<SourceSurface>* aSurface,
1.93 + nsPresContext **aPresContext);
1.94 +
1.95 + /**
1.96 + * Draw a drag image for an image node specified by aImageLoader or aCanvas.
1.97 + * This is called by DrawDrag.
1.98 + */
1.99 + nsresult DrawDragForImage(nsPresContext* aPresContext,
1.100 + nsIImageLoadingContent* aImageLoader,
1.101 + mozilla::dom::HTMLCanvasElement* aCanvas,
1.102 + int32_t aScreenX, int32_t aScreenY,
1.103 + nsIntRect* aScreenDragRect,
1.104 + mozilla::RefPtr<SourceSurface>* aSurface);
1.105 +
1.106 + /**
1.107 + * Convert aScreenX and aScreenY from CSS pixels into unscaled device pixels.
1.108 + */
1.109 + void
1.110 + ConvertToUnscaledDevPixels(nsPresContext* aPresContext,
1.111 + int32_t* aScreenX, int32_t* aScreenY);
1.112 +
1.113 + /**
1.114 + * If the drag image is a popup, open the popup when the drag begins.
1.115 + */
1.116 + void OpenDragPopup();
1.117 +
1.118 + bool mCanDrop;
1.119 + bool mOnlyChromeDrop;
1.120 + bool mDoingDrag;
1.121 + // true if mImage should be used to set a drag image
1.122 + bool mHasImage;
1.123 + // true if the user cancelled the drag operation
1.124 + bool mUserCancelled;
1.125 +
1.126 + uint32_t mDragAction;
1.127 + nsSize mTargetSize;
1.128 + nsCOMPtr<nsIDOMNode> mSourceNode;
1.129 + nsCOMPtr<nsIDOMDocument> mSourceDocument; // the document at the drag source. will be null
1.130 + // if it came from outside the app.
1.131 + nsCOMPtr<nsIDOMDataTransfer> mDataTransfer;
1.132 +
1.133 + // used to determine the image to appear on the cursor while dragging
1.134 + nsCOMPtr<nsIDOMNode> mImage;
1.135 + // offset of cursor within the image
1.136 + int32_t mImageX;
1.137 + int32_t mImageY;
1.138 +
1.139 + // set if a selection is being dragged
1.140 + nsCOMPtr<nsISelection> mSelection;
1.141 +
1.142 + // set if the image in mImage is a popup. If this case, the popup will be opened
1.143 + // and moved instead of using a drag image.
1.144 + nsCOMPtr<nsIContent> mDragPopup;
1.145 +
1.146 + // the screen position where drag gesture occurred, used for positioning the
1.147 + // drag image when no image is specified. If a value is -1, no event was
1.148 + // supplied so the screen position is not known
1.149 + int32_t mScreenX;
1.150 + int32_t mScreenY;
1.151 +
1.152 + // the screen position where the drag ended
1.153 + nsIntPoint mEndDragPoint;
1.154 +
1.155 + uint32_t mSuppressLevel;
1.156 +
1.157 + // The input source of the drag event. Possible values are from nsIDOMMouseEvent.
1.158 + uint16_t mInputSource;
1.159 +};
1.160 +
1.161 +#endif // nsBaseDragService_h__
