// Purpose: topic overview
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
- @page overview_dnd Drag and Drop Overview
-
- Classes: wxDataObject, wxTextDataObject, wxDropSource, wxDropTarget,
- wxTextDropTarget, wxFileDropTarget
-
- Note that @c wxUSE_DRAG_AND_DROP must be defined in @c setup.h in order
- to use drag and drop in wxWidgets.
-
- See also: @ref overview_dataobject and @ref page_utils_samples_dnd.
-
- It may be noted that data transfer to and from the clipboard is quite
- similar to data transfer with drag and drop and the code to implement
- these two types is almost the same. In particular, both data transfer
- mechanisms store data in some kind of wxDataObject and identify its format(s)
- using the wxDataFormat class.
-
- To be a @e drag source, i.e. to provide the data which may be dragged by
- the user elsewhere, you should implement the following steps:
-
- @li @b Preparation: First of all, a data object must be created and
- initialized with the data you wish to drag. For example:
-
- @code
- wxTextDataObject my_data("This text will be dragged.");
- @endcode
-
- @li <b>Drag start</b>: To start the dragging process (typically in response to a
- mouse click) you must call wxDropSource::DoDragDrop like this:
-
- @code
- wxDropSource dragSource( this );
- dragSource.SetData( my_data );
- wxDragResult result = dragSource.DoDragDrop( true );
- @endcode
-
- @li @b Dragging: The call to DoDragDrop() blocks the program until the user releases
- the mouse button (unless you override the wxDropSource::GiveFeedback function to
- do something special). When the mouse moves in a window of a program which understands
- the same drag-and-drop protocol (any program under Windows or any program supporting
- the XDnD protocol under X Windows), the corresponding wxDropTarget methods
- are called - see below.
-
- @li <b>Processing the result</b>: DoDragDrop() returns an @e effect code which
- is one of the values of @c wxDragResult enum (explained in wxDropTarget page):
-
- @code
- switch (result)
- {
- case wxDragCopy:
+@page overview_dnd Drag and Drop Overview
+
+@tableofcontents
+
+It may be noted that data transfer to and from the clipboard is quite
+similar to data transfer with drag and drop and the code to implement
+these two types is almost the same. In particular, both data transfer
+mechanisms store data in some kind of wxDataObject and identify its format(s)
+using the wxDataFormat class.
+
+Note that @c wxUSE_DRAG_AND_DROP must be defined in @c setup.h in order
+to use drag and drop in wxWidgets.
+
+@see @ref overview_dataobject, @ref group_class_dnd, @ref page_samples_dnd
+
+
+
+@section overview_dnd_dropsource Drop Source Requirements
+
+To be a @e "drop source", i.e. to provide the data which may be dragged by
+the user elsewhere, you should implement the following steps:
+
+@li @b Preparation: First of all, a data object must be created and
+ initialized with the data you wish to drag. For example:
+ @code
+ wxTextDataObject my_data("This text will be dragged.");
+ @endcode
+@li <b>Drag start</b>: To start the dragging process (typically in response to a
+ mouse click) you must call wxDropSource::DoDragDrop like this:
+ @code
+ wxDropSource dragSource( this );
+ dragSource.SetData( my_data );
+ wxDragResult result = dragSource.DoDragDrop( true );
+ @endcode
+@li @b Dragging: The call to DoDragDrop() blocks the program until the user
+ releases the mouse button (unless you override the
+ wxDropSource::GiveFeedback function to do something special). When the
+ mouse moves in a window of a program which understands the same
+ drag-and-drop protocol (any program under Windows or any program supporting
+ the XDnD protocol under X Windows), the corresponding wxDropTarget methods
+ are called - see below.
+@li <b>Processing the result</b>: DoDragDrop() returns an @e effect code which
+ is one of the values of @c wxDragResult enum (explained in wxDropTarget page):
+ @code
+ switch (result)
+ {
+ case wxDragCopy:
// copy the data
break;
case wxDragMove:
default:
// do nothing
break;
- }
- @endcode
+ }
+ @endcode
- To be a @e drop target, i.e. to receive the data dropped by the user you should
- follow the instructions below:
- @li @b Initialization: For a window to be a drop target, it needs to have
- an associated wxDropTarget object. Normally, you will call wxWindow::SetDropTarget
- during window creation associating your drop target with it. You must derive a class
- from wxDropTarget and override its pure virtual methods. Alternatively, you may
- derive from wxTextDropTarget or wxFileDropTarget and override their OnDropText()
- or OnDropFiles() method.
+@section overview_dnd_droptarget Drop Target Requirements
- @li @b Drop: When the user releases the mouse over a window, wxWidgets
- asks the associated wxDropTarget object if it accepts the data. For this,
- a wxDataObject must be associated with the drop target and this data object will
- be responsible for the format negotiation between the drag source and the drop target.
- If all goes well, then wxDropTarget::OnData will get called and the wxDataObject belonging
- to the drop target can get filled with data.
+To be a @e "drop target", i.e. to receive the data dropped by the user you should
+follow the instructions below:
- @li <b>The end</b>: After processing the data, DoDragDrop() returns either
- wxDragCopy or wxDragMove depending on the state of the keys Ctrl, Shift
- and Alt at the moment of the drop. There is currently no way for the drop
- target to change this return code.
+@li @b Initialization: For a window to be a drop target, it needs to have
+ an associated wxDropTarget object. Normally, you will call wxWindow::SetDropTarget
+ during window creation associating your drop target with it. You must derive a class
+ from wxDropTarget and override its pure virtual methods. Alternatively, you may
+ derive from wxTextDropTarget or wxFileDropTarget and override their OnDropText()
+ or OnDropFiles() method.
+@li @b Drop: When the user releases the mouse over a window, wxWidgets
+ asks the associated wxDropTarget object if it accepts the data. For this,
+ a wxDataObject must be associated with the drop target and this data object will
+ be responsible for the format negotiation between the drag source and the drop target.
+ If all goes well, then wxDropTarget::OnData will get called and the wxDataObject belonging
+ to the drop target can get filled with data.
+@li <b>The end</b>: After processing the data, DoDragDrop() returns either
+ wxDragCopy or wxDragMove depending on the state of the keys Ctrl, Shift
+ and Alt at the moment of the drop. There is currently no way for the drop
+ target to change this return code.
*/
-
projects / wxWidgets.git / blobdiff