1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is mozilla.org code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * Netscape Communications Corporation.
19 : * Portions created by the Initial Developer are Copyright (C) 1998
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : *
24 : * Alternatively, the contents of this file may be used under the terms of
25 : * either the GNU General Public License Version 2 or later (the "GPL"), or
26 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 : * in which case the provisions of the GPL or the LGPL are applicable instead
28 : * of those above. If you wish to allow use of your version of this file only
29 : * under the terms of either the GPL or the LGPL, and not to allow others to
30 : * use your version of this file under the terms of the MPL, indicate your
31 : * decision by deleting the provisions above and replace them with the notice
32 : * and other provisions required by the GPL or the LGPL. If you do not delete
33 : * the provisions above, a recipient may use your version of this file under
34 : * the terms of any one of the MPL, the GPL or the LGPL.
35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : #ifndef nsBaseDragService_h__
39 : #define nsBaseDragService_h__
40 :
41 : #include "nsIDragService.h"
42 : #include "nsIDragSession.h"
43 : #include "nsITransferable.h"
44 : #include "nsISupportsArray.h"
45 : #include "nsIDOMDocument.h"
46 : #include "nsIDOMDataTransfer.h"
47 : #include "nsIContent.h"
48 : #include "nsCOMPtr.h"
49 : #include "nsPoint.h"
50 :
51 : #include "gfxImageSurface.h"
52 :
53 : // translucency level for drag images
54 : #define DRAG_TRANSLUCENCY 0.65
55 :
56 : class nsIDOMNode;
57 : class nsIFrame;
58 : class nsPresContext;
59 : class nsIImageLoadingContent;
60 : class nsICanvasElementExternal;
61 :
62 : /**
63 : * XP DragService wrapper base class
64 : */
65 :
66 : class nsBaseDragService : public nsIDragService,
67 : public nsIDragSession
68 : {
69 :
70 : public:
71 : nsBaseDragService();
72 : virtual ~nsBaseDragService();
73 :
74 : //nsISupports
75 : NS_DECL_ISUPPORTS
76 :
77 : //nsIDragSession and nsIDragService
78 : NS_DECL_NSIDRAGSERVICE
79 : NS_DECL_NSIDRAGSESSION
80 :
81 0 : void SetDragEndPoint(nsIntPoint aEndDragPoint) { mEndDragPoint = aEndDragPoint; }
82 :
83 : PRUint16 GetInputSource() { return mInputSource; }
84 :
85 : protected:
86 :
87 : /**
88 : * Draw the drag image, if any, to a surface and return it. The drag image
89 : * is constructed from mImage if specified, or aDOMNode if mImage is null.
90 : *
91 : * aRegion may be used to draw only a subset of the element. This region
92 : * should be supplied using x and y coordinates measured in css pixels
93 : * that are relative to the upper-left corner of the window.
94 : *
95 : * aScreenX and aScreenY should be the screen coordinates of the mouse click
96 : * for the drag.
97 : *
98 : * On return, aScreenDragRect will contain the screen coordinates of the
99 : * area being dragged. This is used by the platform-specific part of the
100 : * drag service to determine the drag feedback.
101 : *
102 : * If there is no drag image, the returned surface will be null, but
103 : * aScreenDragRect will still be set to the drag area.
104 : *
105 : * aPresContext will be set to the nsPresContext used determined from
106 : * whichever of mImage or aDOMNode is used.
107 : */
108 : nsresult DrawDrag(nsIDOMNode* aDOMNode,
109 : nsIScriptableRegion* aRegion,
110 : PRInt32 aScreenX, PRInt32 aScreenY,
111 : nsIntRect* aScreenDragRect,
112 : gfxASurface** aSurface,
113 : nsPresContext **aPresContext);
114 :
115 : /**
116 : * Draw a drag image for an image node specified by aImageLoader or aCanvas.
117 : * This is called by DrawDrag.
118 : */
119 : nsresult DrawDragForImage(nsPresContext* aPresContext,
120 : nsIImageLoadingContent* aImageLoader,
121 : nsICanvasElementExternal* aCanvas,
122 : PRInt32 aScreenX, PRInt32 aScreenY,
123 : nsIntRect* aScreenDragRect,
124 : gfxASurface** aSurface);
125 :
126 : /**
127 : * Convert aScreenX and aScreenY from CSS pixels into unscaled device pixels.
128 : */
129 : void
130 : ConvertToUnscaledDevPixels(nsPresContext* aPresContext,
131 : PRInt32* aScreenX, PRInt32* aScreenY);
132 :
133 : /**
134 : * If the drag image is a popup, open the popup when the drag begins.
135 : */
136 : void OpenDragPopup();
137 :
138 : bool mCanDrop;
139 : bool mOnlyChromeDrop;
140 : bool mDoingDrag;
141 : // true if mImage should be used to set a drag image
142 : bool mHasImage;
143 : // true if the user cancelled the drag operation
144 : bool mUserCancelled;
145 :
146 : PRUint32 mDragAction;
147 : nsSize mTargetSize;
148 : nsCOMPtr<nsIDOMNode> mSourceNode;
149 : nsCOMPtr<nsIDOMDocument> mSourceDocument; // the document at the drag source. will be null
150 : // if it came from outside the app.
151 : nsCOMPtr<nsIDOMDataTransfer> mDataTransfer;
152 :
153 : // used to determine the image to appear on the cursor while dragging
154 : nsCOMPtr<nsIDOMNode> mImage;
155 : // offset of cursor within the image
156 : PRInt32 mImageX;
157 : PRInt32 mImageY;
158 :
159 : // set if a selection is being dragged
160 : nsCOMPtr<nsISelection> mSelection;
161 :
162 : // set if the image in mImage is a popup. If this case, the popup will be opened
163 : // and moved instead of using a drag image.
164 : nsCOMPtr<nsIContent> mDragPopup;
165 :
166 : // the screen position where drag gesture occurred, used for positioning the
167 : // drag image when no image is specified. If a value is -1, no event was
168 : // supplied so the screen position is not known
169 : PRInt32 mScreenX;
170 : PRInt32 mScreenY;
171 :
172 : // the screen position where the drag ended
173 : nsIntPoint mEndDragPoint;
174 :
175 : PRUint32 mSuppressLevel;
176 :
177 : // The input source of the drag event. Possible values are from nsIDOMMouseEvent.
178 : PRUint16 mInputSource;
179 : };
180 :
181 : #endif // nsBaseDragService_h__
|