include/wx/msw/dragimag.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/msw/dragimag.h
   3 // Purpose:     wxDragImage class: a kind of a cursor, that can cope
   4 //              with more sophisticated images
   5 // Author:      Julian Smart
   6 // Modified by:
   7 // Created:     08/04/99
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) Julian Smart
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef _WX_DRAGIMAG_H_
  14 #define _WX_DRAGIMAG_H_
  15
  16 #if wxUSE_DRAGIMAGE
  17
  18 #include "wx/bitmap.h"
  19 #include "wx/icon.h"
  20 #include "wx/cursor.h"
  21 #include "wx/treectrl.h"
  22 #include "wx/listctrl.h"
  23
  24 // If 1, use a simple wxCursor instead of ImageList_SetDragCursorImage
  25 #define wxUSE_SIMPLER_DRAGIMAGE 0
  26
  27 /*
  28   To use this class, create a wxDragImage when you start dragging, for example:
  29
  30   void MyTreeCtrl::OnBeginDrag(wxTreeEvent& event)
  31   {
  32 #ifdef __WXMSW__
  33     ::UpdateWindow((HWND) GetHWND()); // We need to implement this in wxWidgets
  34 #endif
  35
  36     CaptureMouse();
  37
  38     m_dragImage = new wxDragImage(* this, itemId);
  39     m_dragImage->BeginDrag(wxPoint(0, 0), this);
  40     m_dragImage->Move(pt, this);
  41     m_dragImage->Show(this);
  42     ...
  43   }
  44
  45   In your OnMouseMove function, hide the image, do any display updating required,
  46   then move and show the image again:
  47
  48   void MyTreeCtrl::OnMouseMove(wxMouseEvent& event)
  49   {
  50     if (m_dragMode == MY_TREE_DRAG_NONE)
  51     {
  52         event.Skip();
  53         return;
  54     }
  55
  56     // Prevent screen corruption by hiding the image
  57     if (m_dragImage)
  58         m_dragImage->Hide(this);
  59
  60     // Do some updating of the window, such as highlighting the drop target
  61     ...
  62
  63 #ifdef __WXMSW__
  64     if (updateWindow)
  65         ::UpdateWindow((HWND) GetHWND());
  66 #endif
  67
  68     // Move and show the image again
  69     m_dragImage->Move(event.GetPosition(), this);
  70     m_dragImage->Show(this);
  71  }
  72
  73  Eventually we end the drag and delete the drag image.
  74
  75  void MyTreeCtrl::OnLeftUp(wxMouseEvent& event)
  76  {
  77     ...
  78
  79     // End the drag and delete the drag image
  80     if (m_dragImage)
  81     {
  82         m_dragImage->EndDrag(this);
  83         delete m_dragImage;
  84         m_dragImage = NULL;
  85     }
  86     ReleaseMouse();
  87  }
  88 */
  89
  90 /*
  91  Notes for Unix version:
  92  Can we simply use cursors instead, creating a cursor dynamically, setting it into the window
  93  in BeginDrag, and restoring the old cursor in EndDrag?
  94  For a really bog-standard implementation, we could simply use a normal dragging cursor
  95  and ignore the image.
  96 */
  97
  98 /*
  99  * wxDragImage
 100  */
 101
 102 class WXDLLIMPEXP_CORE wxDragImage: public wxObject
 103 {
 104 public:
 105
 106     // Ctors & dtor
 107     ////////////////////////////////////////////////////////////////////////////
 108
 109     wxDragImage();
 110     wxDragImage(const wxBitmap& image, const wxCursor& cursor = wxNullCursor)
 111     {
 112         Init();
 113
 114         Create(image, cursor);
 115     }
 116
 117     // Deprecated form of the above
 118     wxDragImage(const wxBitmap& image, const wxCursor& cursor, const wxPoint& cursorHotspot)
 119     {
 120         Init();
 121
 122         Create(image, cursor, cursorHotspot);
 123     }
 124
 125     wxDragImage(const wxIcon& image, const wxCursor& cursor = wxNullCursor)
 126     {
 127         Init();
 128
 129         Create(image, cursor);
 130     }
 131
 132     // Deprecated form of the above
 133     wxDragImage(const wxIcon& image, const wxCursor& cursor, const wxPoint& cursorHotspot)
 134     {
 135         Init();
 136
 137         Create(image, cursor, cursorHotspot);
 138     }
 139
 140     wxDragImage(const wxString& str, const wxCursor& cursor = wxNullCursor)
 141     {
 142         Init();
 143
 144         Create(str, cursor);
 145     }
 146
 147     // Deprecated form of the above
 148     wxDragImage(const wxString& str, const wxCursor& cursor, const wxPoint& cursorHotspot)
 149     {
 150         Init();
 151
 152         Create(str, cursor, cursorHotspot);
 153     }
 154
 155 #if wxUSE_TREECTRL
 156     wxDragImage(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 157     {
 158         Init();
 159
 160         Create(treeCtrl, id);
 161     }
 162 #endif
 163
 164 #if wxUSE_LISTCTRL
 165     wxDragImage(const wxListCtrl& listCtrl, long id)
 166     {
 167         Init();
 168
 169         Create(listCtrl, id);
 170     }
 171 #endif
 172
 173     virtual ~wxDragImage();
 174
 175     // Attributes
 176     ////////////////////////////////////////////////////////////////////////////
 177
 178     // Operations
 179     ////////////////////////////////////////////////////////////////////////////
 180
 181     // Create a drag image from a bitmap and optional cursor
 182     bool Create(const wxBitmap& image, const wxCursor& cursor = wxNullCursor);
 183     bool Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 184     {
 185         wxLogDebug(wxT("wxDragImage::Create: use of a cursor hotspot is now deprecated. Please omit this argument."));
 186         return Create(image, cursor);
 187     }
 188
 189     // Create a drag image from an icon and optional cursor
 190     bool Create(const wxIcon& image, const wxCursor& cursor = wxNullCursor);
 191     bool Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 192     {
 193         wxLogDebug(wxT("wxDragImage::Create: use of a cursor hotspot is now deprecated. Please omit this argument."));
 194         return Create(image, cursor);
 195     }
 196
 197     // Create a drag image from a string and optional cursor
 198     bool Create(const wxString& str, const wxCursor& cursor = wxNullCursor);
 199     bool Create(const wxString& str, const wxCursor& cursor, const wxPoint& WXUNUSED(cursorHotspot))
 200     {
 201         wxLogDebug(wxT("wxDragImage::Create: use of a cursor hotspot is now deprecated. Please omit this argument."));
 202         return Create(str, cursor);
 203     }
 204
 205 #if wxUSE_TREECTRL
 206     // Create a drag image for the given tree control item
 207     bool Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id);
 208 #endif
 209
 210 #if wxUSE_LISTCTRL
 211     // Create a drag image for the given list control item
 212     bool Create(const wxListCtrl& listCtrl, long id);
 213 #endif
 214
 215     // Begin drag. hotspot is the location of the drag position relative to the upper-left
 216     // corner of the image.
 217     bool BeginDrag(const wxPoint& hotspot, wxWindow* window, bool fullScreen = false, wxRect* rect = (wxRect*) NULL);
 218
 219     // Begin drag. hotspot is the location of the drag position relative to the upper-left
 220     // corner of the image. This is full screen only. fullScreenRect gives the
 221     // position of the window on the screen, to restrict the drag to.
 222     bool BeginDrag(const wxPoint& hotspot, wxWindow* window, wxWindow* fullScreenRect);
 223
 224     // End drag
 225     bool EndDrag();
 226
 227     // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 228     // is non-NULL, or in screen coordinates if NULL.
 229     bool Move(const wxPoint& pt);
 230
 231     // Show the image
 232     bool Show();
 233
 234     // Hide the image
 235     bool Hide();
 236
 237     // Implementation
 238     ////////////////////////////////////////////////////////////////////////////
 239
 240     // Initialize variables
 241     void Init();
 242
 243     // Returns the native image list handle
 244     WXHIMAGELIST GetHIMAGELIST() const { return m_hImageList; }
 245
 246 #if !wxUSE_SIMPLER_DRAGIMAGE
 247     // Returns the native image list handle for the cursor
 248     WXHIMAGELIST GetCursorHIMAGELIST() const { return m_hCursorImageList; }
 249 #endif
 250
 251 protected:
 252     WXHIMAGELIST    m_hImageList;
 253
 254 #if wxUSE_SIMPLER_DRAGIMAGE
 255     wxCursor        m_oldCursor;
 256 #else
 257     WXHIMAGELIST    m_hCursorImageList;
 258 #endif
 259
 260     wxCursor        m_cursor;
 261 //    wxPoint         m_cursorHotspot; // Obsolete
 262     wxPoint         m_position;
 263     wxWindow*       m_window;
 264     wxRect          m_boundingRect;
 265     bool            m_fullScreen;
 266
 267 private:
 268     DECLARE_DYNAMIC_CLASS(wxDragImage)
 269     DECLARE_NO_COPY_CLASS(wxDragImage)
 270 };
 271
 272 #endif // wxUSE_DRAGIMAGE
 273 #endif
 274     // _WX_DRAGIMAG_H_