Detailed Description

このクラスはドラッグ・アンド・ドロップ操作におけるドロップ先を表しています。

A wxDataObject can be associated with it and by default, this object will be filled with the data from the drag source, if the data formats supported by the data object match the drag source data format.

There are various virtual handler functions defined in this class which may be overridden to give visual feedback or react in a more fine-tuned way, e.g. by not accepting data on the whole window area, but only a small portion of it. The normal sequence of calls is OnEnter(), OnDragOver() possibly many times, OnDrop() and finally OnData().

Library: wxCore

Category: Clipboard and Drag & Drop

参照:: Drag and Drop Overview, wxDataObject Overview, wxDropSource, wxTextDropTarget, wxFileDropTarget, wxDataFormat, wxDataObject

Public Member Functions
	wxDropTarget (wxDataObject *data=NULL)
	Constructor.
virtual	~wxDropTarget ()
	Destructor.
virtual bool	GetData ()
	This method may only be called from within OnData().
virtual wxDragResult	OnData (wxCoord x, wxCoord y, wxDragResult defResult)=0
	Called after OnDrop() returns true.
virtual wxDragResult	OnDragOver (wxCoord x, wxCoord y, wxDragResult defResult)
	Called when the mouse is being dragged over the drop target.
virtual bool	OnDrop (wxCoord x, wxCoord y)
	Called when the user drops a data object on the target.
virtual wxDragResult	OnEnter (wxCoord x, wxCoord y, wxDragResult defResult)
	Called when the mouse enters the drop target.
virtual void	OnLeave ()
	Called when the mouse leaves the drop target.
void	SetDataObject (wxDataObject *data)
	Sets the data wxDataObject associated with the drop target and deletes any previously associated data object.
void	SetDefaultAction (wxDragResult action)
	Sets the default action for drag and drop.
wxDragResult	GetDefaultAction ()
	Returns default action for drag and drop or wxDragNone if this not specified.

List of all members.

Constructor & Destructor Documentation

wxDropTarget::wxDropTarget ( wxDataObject * data = NULL )

Constructor.

data is the data to be associated with the drop target.

virtual wxDropTarget::~wxDropTarget ( ) [virtual]

Destructor.

Deletes the associated data object, if any.

Member Function Documentation

virtual bool wxDropTarget::GetData ( ) [virtual]

This method may only be called from within OnData().

By default, this method copies the data from the drop source to the wxDataObject associated with this drop target, calling its wxDataObject::SetData() method.

wxDragResult wxDropTarget::GetDefaultAction ( )

Returns default action for drag and drop or wxDragNone if this not specified.

virtual wxDragResult wxDropTarget::OnData	(	wxCoord	x,
		wxCoord	y,
		wxDragResult	defResult
	)		`[pure virtual]`

Called after OnDrop() returns true.

By default this will usually GetData() and will return the suggested default value defResult.

virtual wxDragResult wxDropTarget::OnDragOver	(	wxCoord	x,
		wxCoord	y,
		wxDragResult	defResult
	)		`[virtual]`

Called when the mouse is being dragged over the drop target.

By default, this calls functions return the suggested return value defResult.

Parameters:

x	The x coordinate of the mouse.
y	The y coordinate of the mouse.
defResult	Suggested value for return value. Determined by SHIFT or CONTROL key states.

Returns:: The desired operation or wxDragNone. This is used for optical feedback from the side of the drop source, typically in form of changing the icon.

virtual bool wxDropTarget::OnDrop	(	wxCoord	x,
		wxCoord	y
	)		`[virtual]`

Called when the user drops a data object on the target.

Return false to veto the operation.

Parameters:

x	The x coordinate of the mouse.
y	The y coordinate of the mouse.

Returns:: true to accept the data, or false to veto the operation.

Reimplemented in wxTextDropTarget, and wxFileDropTarget.

virtual wxDragResult wxDropTarget::OnEnter	(	wxCoord	x,
		wxCoord	y,
		wxDragResult	defResult
	)		`[virtual]`

Called when the mouse enters the drop target.

By default, this calls OnDragOver().

Parameters:

x	The x coordinate of the mouse.
y	The y coordinate of the mouse.
defResult	Suggested default for return value. Determined by SHIFT or CONTROL key states.

Returns:: The desired operation or wxDragNone. This is used for optical feedback from the side of the drop source, typically in form of changing the icon.

virtual void wxDropTarget::OnLeave ( ) [virtual]

Called when the mouse leaves the drop target.

void wxDropTarget::SetDataObject ( wxDataObject * data )

Sets the data wxDataObject associated with the drop target and deletes any previously associated data object.

void wxDropTarget::SetDefaultAction ( wxDragResult action )

Sets the default action for drag and drop.

Use wxDragMove or wxDragCopy to set deafult action to move or copy and use wxDragNone (default) to set default action specified by initialization of draging (see wxDropSource::DoDragDrop())

Detailed Description

Public Member Functions

Constructor & Destructor Documentation

Member Function Documentation