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1\section{\class{wxDropTarget}}\label{wxdroptarget}
2
3This class represents a target for a drag and drop operation. A \helpref{wxDataObject}{wxdataobject}
4can be associated with it and by default, this object will be filled with the data from the
5drag source, if the data formats supported by the data object match the drag source data
6format.
7
8There are various virtual handler functions defined in this class which may be overridden
9to give visual feedback or react in a more fine-tuned way, e.g. by not accepting data on
10the whole window area, but only a small portion of it. The normal sequence of calls is
11\helpref{OnEnter}{wxdroptargetonenter}, possibly many times \helpref{OnDragOver}{wxdroptargetondragover},
12\helpref{OnDrop}{wxdroptargetondrop} and finally \helpref{OnData}{wxdroptargetondata}.
13
14See \helpref{Drag and drop overview}{wxdndoverview} and \helpref{wxDataObject overview}{wxdataobjectoverview}
15for more information.
16
17\wxheading{Derived from}
18
19None
20
21\wxheading{Include files}
22
23<wx/dnd.h>
24
25\wxheading{Types}
26
27\index{wxDragResult}wxDragResult is defined as follows:
28
29\begin{verbatim}
30enum wxDragResult
31{
32 wxDragError, // error prevented the d&d operation from completing
33 wxDragNone, // drag target didn't accept the data
34 wxDragCopy, // the data was successfully copied
35 wxDragMove, // the data was successfully moved
36 wxDragCancel // the operation was cancelled by user (not an error)
37};
38\end{verbatim}
39
40\wxheading{See also}
41
42\helpref{wxDropSource}{wxdropsource},
43\helpref{wxTextDropTarget}{wxtextdroptarget}, \helpref{wxFileDropTarget}{wxfiledroptarget},
44\helpref{wxDataFormat}{wxdataformat}, \helpref{wxDataObject}{wxdataobject}
45
46\latexignore{\rtfignore{\wxheading{Members}}}
47
48\membersection{wxDropTarget::wxDropTarget}\label{wxdroptargetwxdroptarget}
49
50\func{}{wxDropTarget}{\param{wxDataObject*}{ data = NULL}}
51
52Constructor. {\it data} is the data to be associated with the drop target.
53
54\membersection{wxDropTarget::\destruct{wxDropTarget}}\label{wxdroptargetdtor}
55
56\func{}{\destruct{wxDropTarget}}{\void}
57
58Destructor. Deletes the associated data object, if any.
59
60\membersection{wxDropTarget::GetData}\label{wxdroptargetgetdata}
61
62\func{virtual void}{GetData}{\void}
63
64This method may only be called from within \helpref{OnData}{wxdroptargetondata}.
65By default, this method copies the data from the drop source to the
66\helpref{wxDataObject}{wxdataobject} associated with this drop target,
67calling its \helpref{wxDataObject::SetData}{wxdataobjectsetdata} method.
68
69\membersection{wxDropTarget::OnData}\label{wxdroptargetondata}
70
71\func{virtual wxDragResult}{OnData}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxDragResult}{ def}}
72
73Called after \helpref{OnDrop}{wxdroptargetondrop} returns TRUE. By default this
74will usually \helpref{GetData}{wxdroptargetgetdata} and will return the suggested
75default value {\it def}.
76
77\membersection{wxDropTarget::OnDrop}\label{wxdroptargetondrop}
78
79\func{virtual bool}{OnDrop}{\param{wxCoord }{x}, \param{wxCoord }{y}}
80
81Called when the user drops a data object on the target. Return FALSE to veto the operation.
82
83\wxheading{Parameters}
84
85\docparam{x}{The x coordinate of the mouse.}
86
87\docparam{y}{The y coordinate of the mouse.}
88
89\wxheading{Return value}
90
91Return TRUE to accept the data, FALSE to veto the operation.
92
93\membersection{wxDropTarget::OnEnter}\label{wxdroptargetonenter}
94
95\func{virtual wxDragResult}{OnEnter}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxDragResult}{ def}}
96
97Called when the mouse enters the drop target. By default, this calls \helpref{OnDragOver}{wxdroptargetondragover}.
98
99\wxheading{Parameters}
100
101\docparam{x}{The x coordinate of the mouse.}
102
103\docparam{y}{The y coordinate of the mouse.}
104
105\docparam{def}{Suggested default for return value. Determined by SHIFT or CONTROL key states.}
106
107\wxheading{Return value}
108
109Returns the desired operation or {\tt wxDragNone}. This is used for optical feedback
110from the side of the drop source, typically in form of changing the icon.
111
112\membersection{wxDropTarget::OnDragOver}\label{wxdroptargetondragover}
113
114\func{virtual wxDragResult}{OnDragOver}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxDragResult}{ def}}
115
116Called when the mouse is being dragged over the drop target. By default,
117this calls functions return the suggested return value {\it def}.
118
119\wxheading{Parameters}
120
121\docparam{x}{The x coordinate of the mouse.}
122
123\docparam{y}{The y coordinate of the mouse.}
124
125\docparam{def}{Suggested value for return value. Determined by SHIFT or CONTROL key states.}
126
127\wxheading{Return value}
128
129Returns the desired operation or {\tt wxDragNone}. This is used for optical feedback
130from the side of the drop source, typically in form of changing the icon.
131
132\membersection{wxDropTarget::OnLeave}\label{wxdroptargetonleave}
133
134\func{virtual void}{OnLeave}{\void}
135
136Called when the mouse leaves the drop target.
137
138\membersection{wxDropTarget::SetDataObject}\label{wxdroptargetsetdataobject}
139
140\func{void}{SetDataObject}{\param{wxDataObject*}{ data}}
141
142Sets the data \helpref{wxDataObject}{wxdataobject} associated with the
143drop target and deletes any previously associated data object.
144