X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/34138703c3997ce676a1e713d9ff9eb020640da7..ebefc86eae4e1f8f9c6efa04234bee363aa58b69:/include/wx/dnd.h diff --git a/include/wx/dnd.h b/include/wx/dnd.h index 84a61155ec..ac3c9c4f84 100644 --- a/include/wx/dnd.h +++ b/include/wx/dnd.h @@ -1,20 +1,267 @@ +/////////////////////////////////////////////////////////////////////////////// +// Name: wx/dnd.h +// Purpose: Drag and drop classes declarations +// Author: Vadim Zeitlin, Robert Roebling +// Modified by: +// Created: 26.05.99 +// RCS-ID: $Id$ +// Copyright: (c) wxWidgets Team +// Licence: wxWindows licence +/////////////////////////////////////////////////////////////////////////////// + #ifndef _WX_DND_H_BASE_ #define _WX_DND_H_BASE_ +#include "wx/defs.h" + +#if wxUSE_DRAG_AND_DROP + +#include "wx/dataobj.h" +#include "wx/cursor.h" + +// ---------------------------------------------------------------------------- +// constants +// ---------------------------------------------------------------------------- + +// flags for wxDropSource::DoDragDrop() +// +// NB: wxDrag_CopyOnly must be 0 (== FALSE) and wxDrag_AllowMove must be 1 +// (== TRUE) for compatibility with the old DoDragDrop(bool) method! +enum +{ + wxDrag_CopyOnly = 0, // allow only copying + wxDrag_AllowMove = 1, // allow moving (copying is always allowed) + wxDrag_DefaultMove = 3 // the default operation is move, not copy +}; + +// result of wxDropSource::DoDragDrop() call +enum wxDragResult +{ + wxDragError, // error prevented the d&d operation from completing + wxDragNone, // drag target didn't accept the data + wxDragCopy, // the data was successfully copied + wxDragMove, // the data was successfully moved (MSW only) + wxDragLink, // operation is a drag-link + wxDragCancel // the operation was cancelled by user (not an error) +}; + +// return true if res indicates that something was done during a dnd operation, +// i.e. is neither error nor none nor cancel +WXDLLIMPEXP_CORE bool wxIsDragResultOk(wxDragResult res); + +// ---------------------------------------------------------------------------- +// wxDropSource is the object you need to create (and call DoDragDrop on it) +// to initiate a drag-and-drop operation +// ---------------------------------------------------------------------------- + +class WXDLLIMPEXP_CORE wxDropSourceBase +{ +public: + wxDropSourceBase(const wxCursor &cursorCopy = wxNullCursor, + const wxCursor &cursorMove = wxNullCursor, + const wxCursor &cursorStop = wxNullCursor) + : m_cursorCopy(cursorCopy), + m_cursorMove(cursorMove), + m_cursorStop(cursorStop) + { m_data = NULL; } + virtual ~wxDropSourceBase() { } + + // set the data which is transfered by drag and drop + void SetData(wxDataObject& data) + { m_data = &data; } + + wxDataObject *GetDataObject() + { return m_data; } + + // set the icon corresponding to given drag result + void SetCursor(wxDragResult res, const wxCursor& cursor) + { + if ( res == wxDragCopy ) + m_cursorCopy = cursor; + else if ( res == wxDragMove ) + m_cursorMove = cursor; + else + m_cursorStop = cursor; + } + + // start drag action, see enum wxDragResult for return value description + // + // if flags contains wxDrag_AllowMove, moving (and only copying) data is + // allowed, if it contains wxDrag_DefaultMove (which includes the previous + // flag), it is even the default operation + virtual wxDragResult DoDragDrop(int flags = wxDrag_CopyOnly) = 0; + + // override to give feedback depending on the current operation result + // "effect" and return true if you did something, false to let the library + // give the default feedback + virtual bool GiveFeedback(wxDragResult WXUNUSED(effect)) { return false; } + +protected: + const wxCursor& GetCursor(wxDragResult res) const + { + if ( res == wxDragCopy ) + return m_cursorCopy; + else if ( res == wxDragMove ) + return m_cursorMove; + else + return m_cursorStop; + } + + // the data we're dragging + wxDataObject *m_data; + + // the cursors to use for feedback + wxCursor m_cursorCopy, + m_cursorMove, + m_cursorStop; + + wxDECLARE_NO_COPY_CLASS(wxDropSourceBase); +}; + +// ---------------------------------------------------------------------------- +// wxDropTarget should be associated with a window if it wants to be able to +// receive data via drag and drop. +// +// To use this class, you should derive from wxDropTarget and implement +// OnData() pure virtual method. You may also wish to override OnDrop() if you +// want to accept the data only inside some region of the window (this may +// avoid having to copy the data to this application which happens only when +// OnData() is called) +// ---------------------------------------------------------------------------- + +class WXDLLIMPEXP_CORE wxDropTargetBase +{ +public: + // ctor takes a pointer to heap-allocated wxDataObject which will be owned + // by wxDropTarget and deleted by it automatically. If you don't give it + // here, you can use SetDataObject() later. + wxDropTargetBase(wxDataObject *dataObject = NULL) + { m_dataObject = dataObject; m_defaultAction = wxDragNone; } + // dtor deletes our data object + virtual ~wxDropTargetBase() + { delete m_dataObject; } + + // get/set the associated wxDataObject + wxDataObject *GetDataObject() const + { return m_dataObject; } + void SetDataObject(wxDataObject *dataObject) + { if (m_dataObject) delete m_dataObject; + m_dataObject = dataObject; } + + // these functions are called when data is moved over position (x, y) and + // may return either wxDragCopy, wxDragMove or wxDragNone depending on + // what would happen if the data were dropped here. + // + // the last parameter is what would happen by default and is determined by + // the platform-specific logic (for example, under Windows it's wxDragCopy + // if Ctrl key is pressed and wxDragMove otherwise) except that it will + // always be wxDragNone if the carried data is in an unsupported format. + + // called when the mouse enters the window (only once until OnLeave()) + virtual wxDragResult OnEnter(wxCoord x, wxCoord y, wxDragResult def) + { return OnDragOver(x, y, def); } + + // called when the mouse moves in the window - shouldn't take long to + // execute or otherwise mouse movement would be too slow + virtual wxDragResult OnDragOver(wxCoord WXUNUSED(x), wxCoord WXUNUSED(y), + wxDragResult def) + { return def; } + + // called when mouse leaves the window: might be used to remove the + // feedback which was given in OnEnter() + virtual void OnLeave() { } + + // this function is called when data is dropped at position (x, y) - if it + // returns true, OnData() will be called immediately afterwards which will + // allow to retrieve the data dropped. + virtual bool OnDrop(wxCoord x, wxCoord y) = 0; + + // called after OnDrop() returns TRUE: you will usually just call + // GetData() from here and, probably, also refresh something to update the + // new data and, finally, return the code indicating how did the operation + // complete (returning default value in case of success and wxDragError on + // failure is usually ok) + virtual wxDragResult OnData(wxCoord x, wxCoord y, wxDragResult def) = 0; + + // may be called *only* from inside OnData() and will fill m_dataObject + // with the data from the drop source if it returns true + virtual bool GetData() = 0; + + // 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 wxDropSourceBase::DoDragDrop()) + void SetDefaultAction(wxDragResult action) + { m_defaultAction = action; } + + // returns default action for drag and drop or + // wxDragNone if this not specified + wxDragResult GetDefaultAction() + { return m_defaultAction; } + +protected: + wxDataObject *m_dataObject; + wxDragResult m_defaultAction; + + wxDECLARE_NO_COPY_CLASS(wxDropTargetBase); +}; + +// ---------------------------------------------------------------------------- +// include platform dependent class declarations +// ---------------------------------------------------------------------------- + #if defined(__WXMSW__) -#include "wx/msw/ole/dropsrc.h" -#include "wx/msw/ole/droptgt.h" -#include "wx/msw/ole/dataobj.h" + #include "wx/msw/ole/dropsrc.h" + #include "wx/msw/ole/droptgt.h" #elif defined(__WXMOTIF__) + #include "wx/motif/dnd.h" +#elif defined(__WXX11__) + #include "wx/x11/dnd.h" +#elif defined(__WXGTK20__) + #include "wx/gtk/dnd.h" #elif defined(__WXGTK__) -#include "wx/gtk/dnd.h" -#elif defined(__WXQT__) -#include "wx/qt/dnd.h" + #include "wx/gtk1/dnd.h" #elif defined(__WXMAC__) -#include "wx/mac/dnd.h" -#elif defined(__WXSTUBS__) -#include "wx/stubs/dnd.h" + #include "wx/osx/dnd.h" +#elif defined(__WXPM__) + #include "wx/os2/dnd.h" #endif -#endif - // _WX_DND_H_BASE_ +// ---------------------------------------------------------------------------- +// standard wxDropTarget implementations (implemented in common/dobjcmn.cpp) +// ---------------------------------------------------------------------------- + +// A simple wxDropTarget derived class for text data: you only need to +// override OnDropText() to get something working +class WXDLLIMPEXP_CORE wxTextDropTarget : public wxDropTarget +{ +public: + wxTextDropTarget(); + + virtual bool OnDropText(wxCoord x, wxCoord y, const wxString& text) = 0; + + virtual wxDragResult OnData(wxCoord x, wxCoord y, wxDragResult def); + +private: + wxDECLARE_NO_COPY_CLASS(wxTextDropTarget); +}; + +// A drop target which accepts files (dragged from File Manager or Explorer) +class WXDLLIMPEXP_CORE wxFileDropTarget : public wxDropTarget +{ +public: + wxFileDropTarget(); + + // parameters are the number of files and the array of file names + virtual bool OnDropFiles(wxCoord x, wxCoord y, + const wxArrayString& filenames) = 0; + + virtual wxDragResult OnData(wxCoord x, wxCoord y, wxDragResult def); + +private: + wxDECLARE_NO_COPY_CLASS(wxFileDropTarget); +}; + +#endif // wxUSE_DRAG_AND_DROP + +#endif // _WX_DND_H_BASE_