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git.saurik.com Git - wxWidgets.git/blob - interface/dnd.h
1 /////////////////////////////////////////////////////////////////////////////
3 // Purpose: interface of wxDropSource and wx*DropTarget
4 // Author: wxWidgets team
6 // Licence: wxWindows license
7 /////////////////////////////////////////////////////////////////////////////
10 @class wxTextDropTarget
13 A predefined drop target for dealing with text data.
18 @see @ref overview_dnd, wxDropSource, wxDropTarget, wxFileDropTarget
20 class wxTextDropTarget
: public wxDropTarget
29 See wxDropTarget::OnDrop(). This function is implemented appropriately
30 for text, and calls OnDropText().
32 virtual bool OnDrop(long x
, long y
, const void data
, size_t size
);
35 Override this function to receive dropped text.
38 The x coordinate of the mouse.
40 The y coordinate of the mouse.
42 The data being dropped: a wxString.
44 Return @true to accept the data, or @false to veto the operation.
46 virtual bool OnDropText(wxCoord x
, wxCoord y
, const wxString
& data
);
52 Result returned from a wxDropSource::DoDragDrop() call.
56 wxDragError
, ///< Error prevented the D&D operation from completing.
57 wxDragNone
, ///< Drag target didn't accept the data.
58 wxDragCopy
, ///< The data was successfully copied.
59 wxDragMove
, ///< The data was successfully moved (MSW only).
60 wxDragLink
, ///< Operation is a drag-link.
61 wxDragCancel
///< The operation was cancelled by user (not an error).
68 This class represents a target for a drag and drop operation. A
69 wxDataObject can be associated with it and by default, this object will be
70 filled with the data from the drag source, if the data formats supported by
71 the data object match the drag source data format.
73 There are various virtual handler functions defined in this class which may
74 be overridden to give visual feedback or react in a more fine-tuned way,
75 e.g. by not accepting data on the whole window area, but only a small
76 portion of it. The normal sequence of calls is OnEnter(), OnDragOver()
77 possibly many times, OnDrop() and finally OnData().
82 @see @ref overview_dnd, @ref overview_dataobject, wxDropSource,
83 wxTextDropTarget, wxFileDropTarget, wxDataFormat, wxDataObject
89 Constructor. @a data is the data to be associated with the drop target.
91 wxDropTarget(wxDataObject
* data
= NULL
);
94 Destructor. Deletes the associated data object, if any.
99 This method may only be called from within OnData(). By default, this
100 method copies the data from the drop source to the wxDataObject
101 associated with this drop target, calling its wxDataObject::SetData()
104 virtual void GetData();
107 Called after OnDrop() returns @true. By default this will usually
108 GetData() and will return the suggested default value @a def.
110 virtual wxDragResult
OnData(wxCoord x
, wxCoord y
, wxDragResult def
);
113 Called when the mouse is being dragged over the drop target. By
114 default, this calls functions return the suggested return value @a def.
117 The x coordinate of the mouse.
119 The y coordinate of the mouse.
121 Suggested value for return value. Determined by SHIFT or CONTROL
124 @returns The desired operation or wxDragNone. This is used for optical
125 feedback from the side of the drop source, typically in form
126 of changing the icon.
128 virtual wxDragResult
OnDragOver(wxCoord x
, wxCoord y
, wxDragResult def
);
131 Called when the user drops a data object on the target. Return @false
132 to veto the operation.
135 The x coordinate of the mouse.
137 The y coordinate of the mouse.
139 @returns @true to accept the data, or @false to veto the operation.
141 virtual bool OnDrop(wxCoord x
, wxCoord y
);
144 Called when the mouse enters the drop target. By default, this calls
148 The x coordinate of the mouse.
150 The y coordinate of the mouse.
152 Suggested default for return value. Determined by SHIFT or CONTROL
155 @returns The desired operation or wxDragNone. This is used for optical
156 feedback from the side of the drop source, typically in form
157 of changing the icon.
159 virtual wxDragResult
OnEnter(wxCoord x
, wxCoord y
, wxDragResult def
);
162 Called when the mouse leaves the drop target.
164 virtual void OnLeave();
167 Sets the data wxDataObject associated with the drop target and deletes
168 any previously associated data object.
170 void SetDataObject(wxDataObject
* data
);
179 This class represents a source for a drag and drop operation.
184 @see @ref overview_dnd, @ref overview_dataobject, wxDropTarget,
185 wxTextDropTarget, wxFileDropTarget
191 This constructor requires that you must call SetData() later.
193 Note that the exact type of @a iconCopy and subsequent parameters
194 differs between wxMSW and wxGTK: these are cursors under Windows but
195 icons for GTK. You should use the macro wxDROP_ICON() in portable
196 programs instead of directly using either of these types.
199 The window which initiates the drag and drop operation.
201 The icon or cursor used for feedback for copy operation.
203 The icon or cursor used for feedback for move operation.
205 The icon or cursor used for feedback when operation can't be done.
207 wxDropSource(wxWindow
* win
= NULL
,
208 const wxIconOrCursor
& iconCopy
= wxNullIconOrCursor
,
209 const wxIconOrCursor
& iconMove
= wxNullIconOrCursor
,
210 const wxIconOrCursor
& iconNone
= wxNullIconOrCursor
);
212 Note that the exact type of @a iconCopy and subsequent parameters
213 differs between wxMSW and wxGTK: these are cursors under Windows but
214 icons for GTK. You should use the macro wxDROP_ICON() in portable
215 programs instead of directly using either of these types.
218 The window which initiates the drag and drop operation.
220 The icon or cursor used for feedback for copy operation.
222 The icon or cursor used for feedback for move operation.
224 The icon or cursor used for feedback when operation can't be done.
226 wxDropSource(wxDataObject
& data
, wxWindow
* win
= NULL
,
227 const wxIconOrCursor
& iconCopy
= wxNullIconOrCursor
,
228 const wxIconOrCursor
& iconMove
= wxNullIconOrCursor
,
229 const wxIconOrCursor
& iconNone
= wxNullIconOrCursor
);
237 Starts the drag-and-drop operation which will terminate when the user
238 releases the mouse. Call this in response to a mouse button press, for
242 If wxDrag_AllowMove is included in the flags, data may be moved and
243 not only copied (default). If wxDrag_DefaultMove is specified
244 (which includes the previous flag), this is even the default
247 @returns The operation requested by the user, may be ::wxDragCopy,
248 ::wxDragMove, ::wxDragLink, ::wxDragCancel or ::wxDragNone if
251 virtual wxDragResult
DoDragDrop(int flags
= wxDrag_CopyOnly
);
254 Returns the wxDataObject object that has been assigned previously.
256 wxDataObject
* GetDataObject();
259 You may give some custom UI feedback during the drag and drop operation
260 by overriding this function. It is called on each mouse move, so your
261 implementation must not be too slow.
264 The effect to implement. One of ::wxDragCopy, ::wxDragMove,
265 ::wxDragLink and ::wxDragNone.
267 @true if the window is scrolling. MSW only.
269 @returns @false if you want default feedback, or @true if you implement
270 your own feedback. The return values is ignored under GTK.
272 virtual bool GiveFeedback(wxDragResult effect
);
275 Set the icon to use for a certain drag result.
278 The drag result to set the icon for.
280 The ion to show when this drag result occurs.
282 void SetCursor(wxDragResult res
, const wxCursor
& cursor
);
285 Sets the data wxDataObject associated with the drop source. This will
286 not delete any previously associated data.
288 void SetData(wxDataObject
& data
);
294 @class wxFileDropTarget
297 This is a drop target which accepts files (dragged from File Manager or
303 @see @ref overview_dnd, wxDropSource, wxDropTarget, wxTextDropTarget
305 class wxFileDropTarget
: public wxDropTarget
314 See wxDropTarget::OnDrop(). This function is implemented appropriately
315 for files, and calls OnDropFiles().
317 virtual bool OnDrop(long x
, long y
, const void data
, size_t size
);
320 Override this function to receive dropped files.
323 The x coordinate of the mouse.
325 The y coordinate of the mouse.
327 An array of filenames.
329 Return @true to accept the data, or @false to veto the operation.
331 virtual bool OnDropFiles(wxCoord x
, wxCoord y
,
332 const wxArrayString
& filenames
);
337 // ============================================================================
338 // Global functions/macros
339 // ============================================================================
341 /** @ingroup group_funcmacro_gdi */
345 This macro creates either a cursor (MSW) or an icon (elsewhere) with the
346 given @a name (of type <tt>const char*</tt>). Under MSW, the cursor is
347 loaded from the resource file and the icon is loaded from XPM file under
350 This macro should be used with wxDropSource::wxDropSource().
352 @returns wxCursor on MSW, otherwise returns a wxIcon
356 #define wxDROP_ICON(name)