f6bcfd974e
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
145 lines
5.0 KiB
TeX
145 lines
5.0 KiB
TeX
\section{\class{wxDropTarget}}\label{wxdroptarget}
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This class represents a target for a drag and drop operation. A \helpref{wxDataObject}{wxdataobject}
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can be associated with it and by default, this object will be filled with the data from the
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drag source, if the data formats supported by the data object match the drag source data
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format.
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There are various virtual handler functions defined in this class which may be overridden
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to give visual feedback or react in a more fine-tuned way, e.g. by not accepting data on
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the whole window area, but only a small portion of it. The normal sequence of calls is
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\helpref{OnEnter}{wxdroptargetonenter}, possibly many times \helpref{OnDragOver}{wxdroptargetondragover},
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\helpref{OnDrop}{wxdroptargetondrop} and finally \helpref{OnData}{wxdroptargetondata}.
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See \helpref{Drag and drop overview}{wxdndoverview} and \helpref{wxDataObject overview}{wxdataobjectoverview}
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for more information.
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\wxheading{Derived from}
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None
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\wxheading{Include files}
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<wx/dnd.h>
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\wxheading{Types}
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\index{wxDragResult}wxDragResult is defined as follows:
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\begin{verbatim}
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enum wxDragResult
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{
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wxDragError, // error prevented the d&d operation from completing
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wxDragNone, // drag target didn't accept the data
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wxDragCopy, // the data was successfully copied
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wxDragMove, // the data was successfully moved
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wxDragCancel // the operation was cancelled by user (not an error)
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};
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\end{verbatim}
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\wxheading{See also}
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\helpref{wxDropSource}{wxdropsource},
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\helpref{wxTextDropTarget}{wxtextdroptarget}, \helpref{wxFileDropTarget}{wxfiledroptarget},
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\helpref{wxDataFormat}{wxdataformat}, \helpref{wxDataObject}{wxdataobject}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxDropTarget::wxDropTarget}\label{wxdroptargetwxdroptarget}
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\func{}{wxDropTarget}{\param{wxDataObject*}{ data = NULL}}
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Constructor. {\it data} is the data to be associated with the drop target.
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\membersection{wxDropTarget::\destruct{wxDropTarget}}\label{wxdroptargetdtor}
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\func{}{\destruct{wxDropTarget}}{\void}
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Destructor. Deletes the associated data object, if any.
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\membersection{wxDropTarget::GetData}\label{wxdroptargetgetdata}
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\func{virtual void}{GetData}{\void}
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This method may only be called from within \helpref{OnData}{wxdroptargetondata}.
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By default, this method copies the data from the drop source to the
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\helpref{wxDataObject}{wxdataobject} associated with this drop target,
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calling its \helpref{wxDataObject::SetData}{wxdataobjectsetdata} method.
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\membersection{wxDropTarget::OnData}\label{wxdroptargetondata}
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\func{virtual wxDragResult}{OnData}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxDragResult}{ def}}
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Called after \helpref{OnDrop}{wxdroptargetondrop} returns TRUE. By default this
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will usually \helpref{GetData}{wxdroptargetgetdata} and will return the suggested
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default value {\it def}.
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\membersection{wxDropTarget::OnDrop}\label{wxdroptargetondrop}
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\func{virtual bool}{OnDrop}{\param{wxCoord }{x}, \param{wxCoord }{y}}
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Called when the user drops a data object on the target. Return FALSE to veto the operation.
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\wxheading{Parameters}
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\docparam{x}{The x coordinate of the mouse.}
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\docparam{y}{The y coordinate of the mouse.}
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\wxheading{Return value}
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Return TRUE to accept the data, FALSE to veto the operation.
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\membersection{wxDropTarget::OnEnter}\label{wxdroptargetonenter}
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\func{virtual wxDragResult}{OnEnter}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxDragResult}{ def}}
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Called when the mouse enters the drop target. By default, this calls \helpref{OnDragOver}{wxdroptargetondragover}.
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\wxheading{Parameters}
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\docparam{x}{The x coordinate of the mouse.}
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\docparam{y}{The y coordinate of the mouse.}
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\docparam{def}{Suggested default for return value. Determined by SHIFT or CONTROL key states.}
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\wxheading{Return value}
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Returns the desired operation or {\tt wxDragNone}. This is used for optical feedback
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from the side of the drop source, typically in form of changing the icon.
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\membersection{wxDropTarget::OnDragOver}\label{wxdroptargetondragover}
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\func{virtual wxDragResult}{OnDragOver}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxDragResult}{ def}}
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Called when the mouse is being dragged over the drop target. By default,
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this calls functions return the suggested return value {\it def}.
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\wxheading{Parameters}
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\docparam{x}{The x coordinate of the mouse.}
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\docparam{y}{The y coordinate of the mouse.}
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\docparam{def}{Suggested value for return value. Determined by SHIFT or CONTROL key states.}
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\wxheading{Return value}
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Returns the desired operation or {\tt wxDragNone}. This is used for optical feedback
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from the side of the drop source, typically in form of changing the icon.
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\membersection{wxDropTarget::OnLeave}\label{wxdroptargetonleave}
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\func{virtual void}{OnLeave}{\void}
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Called when the mouse leaves the drop target.
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\membersection{wxDropTarget::SetDataObject}\label{wxdroptargetsetdataobject}
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\func{void}{SetDataObject}{\param{wxDataObject*}{ data}}
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Sets the data \helpref{wxDataObject}{wxdataobject} associated with the
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drop target and deletes any previously associated data object.
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