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comparison: widget/xpwidgets/nsBaseDragService.h
widget/xpwidgets/nsBaseDragService.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef nsBaseDragService_h__ | |
| 7 #define nsBaseDragService_h__ | |
| 8 | |
| 9 #include "nsIDragService.h" | |
| 10 #include "nsIDragSession.h" | |
| 11 #include "nsITransferable.h" | |
| 12 #include "nsIDOMDocument.h" | |
| 13 #include "nsIDOMDataTransfer.h" | |
| 14 #include "nsCOMPtr.h" | |
| 15 #include "nsRect.h" | |
| 16 #include "nsPoint.h" | |
| 17 #include "mozilla/RefPtr.h" | |
| 18 #include "mozilla/dom/HTMLCanvasElement.h" | |
| 19 | |
| 20 // translucency level for drag images | |
| 21 #define DRAG_TRANSLUCENCY 0.65 | |
| 22 | |
| 23 class nsIContent; | |
| 24 class nsIDOMNode; | |
| 25 class nsIFrame; | |
| 26 class nsPresContext; | |
| 27 class nsIImageLoadingContent; | |
| 28 class nsICanvasElementExternal; | |
| 29 | |
| 30 namespace mozilla { | |
| 31 namespace gfx { | |
| 32 class SourceSurface; | |
| 33 } | |
| 34 } | |
| 35 | |
| 36 /** | |
| 37 * XP DragService wrapper base class | |
| 38 */ | |
| 39 | |
| 40 class nsBaseDragService : public nsIDragService, | |
| 41 public nsIDragSession | |
| 42 { | |
| 43 | |
| 44 public: | |
| 45 typedef mozilla::gfx::SourceSurface SourceSurface; | |
| 46 | |
| 47 nsBaseDragService(); | |
| 48 virtual ~nsBaseDragService(); | |
| 49 | |
| 50 //nsISupports | |
| 51 NS_DECL_ISUPPORTS | |
| 52 | |
| 53 //nsIDragSession and nsIDragService | |
| 54 NS_DECL_NSIDRAGSERVICE | |
| 55 NS_DECL_NSIDRAGSESSION | |
| 56 | |
| 57 void SetDragEndPoint(nsIntPoint aEndDragPoint) { mEndDragPoint = aEndDragPoint; } | |
| 58 | |
| 59 uint16_t GetInputSource() { return mInputSource; } | |
| 60 | |
| 61 protected: | |
| 62 | |
| 63 /** | |
| 64 * Draw the drag image, if any, to a surface and return it. The drag image | |
| 65 * is constructed from mImage if specified, or aDOMNode if mImage is null. | |
| 66 * | |
| 67 * aRegion may be used to draw only a subset of the element. This region | |
| 68 * should be supplied using x and y coordinates measured in css pixels | |
| 69 * that are relative to the upper-left corner of the window. | |
| 70 * | |
| 71 * aScreenX and aScreenY should be the screen coordinates of the mouse click | |
| 72 * for the drag. These are in global display pixels. | |
| 73 * | |
| 74 * On return, aScreenDragRect will contain the screen coordinates of the | |
| 75 * area being dragged. This is used by the platform-specific part of the | |
| 76 * drag service to determine the drag feedback. This rect will be in the | |
| 77 * device pixels of the presContext. | |
| 78 * | |
| 79 * If there is no drag image, the returned surface will be null, but | |
| 80 * aScreenDragRect will still be set to the drag area. | |
| 81 * | |
| 82 * aPresContext will be set to the nsPresContext used determined from | |
| 83 * whichever of mImage or aDOMNode is used. | |
| 84 */ | |
| 85 nsresult DrawDrag(nsIDOMNode* aDOMNode, | |
| 86 nsIScriptableRegion* aRegion, | |
| 87 int32_t aScreenX, int32_t aScreenY, | |
| 88 nsIntRect* aScreenDragRect, | |
| 89 mozilla::RefPtr<SourceSurface>* aSurface, | |
| 90 nsPresContext **aPresContext); | |
| 91 | |
| 92 /** | |
| 93 * Draw a drag image for an image node specified by aImageLoader or aCanvas. | |
| 94 * This is called by DrawDrag. | |
| 95 */ | |
| 96 nsresult DrawDragForImage(nsPresContext* aPresContext, | |
| 97 nsIImageLoadingContent* aImageLoader, | |
| 98 mozilla::dom::HTMLCanvasElement* aCanvas, | |
| 99 int32_t aScreenX, int32_t aScreenY, | |
| 100 nsIntRect* aScreenDragRect, | |
| 101 mozilla::RefPtr<SourceSurface>* aSurface); | |
| 102 | |
| 103 /** | |
| 104 * Convert aScreenX and aScreenY from CSS pixels into unscaled device pixels. | |
| 105 */ | |
| 106 void | |
| 107 ConvertToUnscaledDevPixels(nsPresContext* aPresContext, | |
| 108 int32_t* aScreenX, int32_t* aScreenY); | |
| 109 | |
| 110 /** | |
| 111 * If the drag image is a popup, open the popup when the drag begins. | |
| 112 */ | |
| 113 void OpenDragPopup(); | |
| 114 | |
| 115 bool mCanDrop; | |
| 116 bool mOnlyChromeDrop; | |
| 117 bool mDoingDrag; | |
| 118 // true if mImage should be used to set a drag image | |
| 119 bool mHasImage; | |
| 120 // true if the user cancelled the drag operation | |
| 121 bool mUserCancelled; | |
| 122 | |
| 123 uint32_t mDragAction; | |
| 124 nsSize mTargetSize; | |
| 125 nsCOMPtr<nsIDOMNode> mSourceNode; | |
| 126 nsCOMPtr<nsIDOMDocument> mSourceDocument; // the document at the drag source. will be null | |
| 127 // if it came from outside the app. | |
| 128 nsCOMPtr<nsIDOMDataTransfer> mDataTransfer; | |
| 129 | |
| 130 // used to determine the image to appear on the cursor while dragging | |
| 131 nsCOMPtr<nsIDOMNode> mImage; | |
| 132 // offset of cursor within the image | |
| 133 int32_t mImageX; | |
| 134 int32_t mImageY; | |
| 135 | |
| 136 // set if a selection is being dragged | |
| 137 nsCOMPtr<nsISelection> mSelection; | |
| 138 | |
| 139 // set if the image in mImage is a popup. If this case, the popup will be opened | |
| 140 // and moved instead of using a drag image. | |
| 141 nsCOMPtr<nsIContent> mDragPopup; | |
| 142 | |
| 143 // the screen position where drag gesture occurred, used for positioning the | |
| 144 // drag image when no image is specified. If a value is -1, no event was | |
| 145 // supplied so the screen position is not known | |
| 146 int32_t mScreenX; | |
| 147 int32_t mScreenY; | |
| 148 | |
| 149 // the screen position where the drag ended | |
| 150 nsIntPoint mEndDragPoint; | |
| 151 | |
| 152 uint32_t mSuppressLevel; | |
| 153 | |
| 154 // The input source of the drag event. Possible values are from nsIDOMMouseEvent. | |
| 155 uint16_t mInputSource; | |
| 156 }; | |
| 157 | |
| 158 #endif // nsBaseDragService_h__ |
