src/msw/dragimag.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dragimag.cpp
   3 // Purpose:     wxDragImage
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     08/04/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21 #pragma implementation "dragimag.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26 #include "wx/msw/private.h"
  27
  28 #ifdef __BORLANDC__
  29 #pragma hdrstop
  30 #endif
  31
  32 #if defined(__WIN95__)
  33
  34 #ifndef WX_PRECOMP
  35 #include <stdio.h>
  36 #include "wx/setup.h"
  37 #include "wx/window.h"
  38 #include "wx/dcclient.h"
  39 #include "wx/dcscreen.h"
  40 #include "wx/dcmemory.h"
  41 #include "wx/settings.h"
  42 #endif
  43
  44 #include "wx/log.h"
  45 #include "wx/intl.h"
  46
  47 #include "wx/msw/dragimag.h"
  48 #include "wx/msw/private.h"
  49
  50 #if defined(__WIN95__) && !(defined(__GNUWIN32_OLD__) || defined(__TWIN32__))
  51 #include <commctrl.h>
  52 #endif
  53
  54 // ----------------------------------------------------------------------------
  55 // macros
  56 // ----------------------------------------------------------------------------
  57
  58 IMPLEMENT_DYNAMIC_CLASS(wxDragImage, wxObject)
  59
  60 #define GetHimageList() ((HIMAGELIST) m_hImageList)
  61
  62 // ============================================================================
  63 // implementation
  64 // ============================================================================
  65
  66 // ----------------------------------------------------------------------------
  67 // wxDragImage ctors/dtor
  68 // ----------------------------------------------------------------------------
  69
  70 wxDragImage::wxDragImage()
  71 {
  72     m_hImageList = 0;
  73 }
  74
  75 wxDragImage::~wxDragImage()
  76 {
  77     if ( m_hImageList )
  78         ImageList_Destroy(GetHimageList());
  79 }
  80
  81
  82 // Attributes
  83 ////////////////////////////////////////////////////////////////////////////
  84
  85
  86 // Operations
  87 ////////////////////////////////////////////////////////////////////////////
  88
  89 // Create a drag image from a bitmap and optional cursor
  90 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& hotspot)
  91 {
  92     if ( m_hImageList )
  93         ImageList_Destroy(GetHimageList());
  94     m_hImageList = 0;
  95
  96     UINT flags = 0;
  97     bool mask = TRUE; // ?
  98     if ( mask )
  99         flags |= ILC_MASK;
 100
 101     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 102
 103     HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
 104     HBITMAP hBitmap2 = 0;
 105     if ( image.GetMask() )
 106         hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
 107
 108     int index = ImageList_Add(GetHimageList(), hBitmap1, hBitmap2);
 109     if ( index == -1 )
 110     {
 111         wxLogError(_("Couldn't add an image to the image list."));
 112     }
 113
 114     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 115     m_hotspot = hotspot;
 116
 117     return (index != -1) ;
 118 }
 119
 120 // Create a drag image from an icon and optional cursor
 121 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& hotspot)
 122 {
 123     if ( m_hImageList )
 124         ImageList_Destroy(GetHimageList());
 125     m_hImageList = 0;
 126
 127     UINT flags = 0;
 128     bool mask = TRUE; // ?
 129     if ( mask )
 130         flags |= ILC_MASK;
 131
 132     m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 133
 134     HICON hIcon = (HICON) image.GetHICON();
 135
 136     int index = ImageList_AddIcon(GetHimageList(), hIcon);
 137     if ( index == -1 )
 138     {
 139         wxLogError(_("Couldn't add an image to the image list."));
 140     }
 141
 142     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 143     m_hotspot = hotspot;
 144
 145     return (index != -1) ;
 146 }
 147
 148 // Create a drag image from a string and optional cursor
 149 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor, const wxPoint& hotspot)
 150 {
 151     wxFont font(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 152
 153     long w, h;
 154     wxScreenDC dc;
 155     dc.SetFont(font);
 156     dc.GetTextExtent(str, & w, & h);
 157
 158     wxMemoryDC dc2;
 159     dc2.SetFont(font);
 160     wxBitmap bitmap((int) w, (int) h);
 161     dc2.SelectObject(bitmap);
 162
 163     dc2.SetBackground(* wxWHITE_BRUSH);
 164     dc2.Clear();
 165     dc2.DrawText(str, 0, 0);
 166
 167     dc2.SelectObject(wxNullBitmap);
 168
 169     return Create(bitmap, cursor, hotspot);
 170 }
 171
 172 // Create a drag image for the given tree control item
 173 bool wxDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 174 {
 175     if ( m_hImageList )
 176         ImageList_Destroy(GetHimageList());
 177     m_hImageList = (WXHIMAGELIST) TreeView_CreateDragImage((HWND) treeCtrl.GetHWND(), (HTREEITEM) (WXHTREEITEM) id);
 178     return TRUE;
 179 }
 180
 181 // Create a drag image for the given list control item
 182 bool wxDragImage::Create(const wxListCtrl& listCtrl, long id)
 183 {
 184     if ( m_hImageList )
 185         ImageList_Destroy(GetHimageList());
 186     POINT pt;
 187     pt.x = 0; pt.y = 0;
 188     m_hImageList = (WXHIMAGELIST) ListView_CreateDragImage((HWND) listCtrl.GetHWND(), id, & pt);
 189     return TRUE;
 190 }
 191
 192 // Begin drag
 193 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* window)
 194 {
 195     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in BeginDrag."));
 196
 197     bool ret = (ImageList_BeginDrag(GetHimageList(), 0, hotspot.x, hotspot.y) != 0);
 198
 199     if (!ret)
 200     {
 201         wxFAIL_MSG( _T("BeginDrag failed.") );
 202
 203         return FALSE;
 204     }
 205
 206     if (m_cursor.Ok())
 207     {
 208         // First add the cursor to the image list
 209         int cursorIndex = ImageList_AddIcon(GetHimageList(), (HICON) m_cursor.GetHCURSOR());
 210
 211         wxASSERT_MSG( (cursorIndex != -1), wxT("ImageList_AddIcon failed in BeginDrag."));
 212
 213         if (cursorIndex != -1)
 214         {
 215             ImageList_SetDragCursorImage(GetHimageList(), cursorIndex, m_hotspot.x, m_hotspot.y);
 216         }
 217     }
 218
 219     ::ShowCursor(FALSE);
 220     ::SetCapture(GetHwndOf(window));
 221
 222     return TRUE;
 223 }
 224
 225 // End drag
 226 bool wxDragImage::EndDrag(wxWindow* WXUNUSED(window))
 227 {
 228     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in EndDrag."));
 229
 230     ImageList_EndDrag();
 231
 232     if ( !::ReleaseCapture() )
 233     {
 234         wxLogLastError("ReleaseCapture");
 235     }
 236
 237     ::ShowCursor(TRUE);
 238
 239     return TRUE;
 240 }
 241
 242 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 243 // is non-NULL, or in screen coordinates if NULL.
 244 bool wxDragImage::Move(const wxPoint& pt, wxWindow* window)
 245 {
 246     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Move."));
 247
 248     // TODO: what coordinates are these in: window, client, or screen?
 249     bool ret = (ImageList_DragMove( pt.x, pt.y ) != 0);
 250
 251     m_position = pt;
 252
 253     return ret;
 254 }
 255
 256 bool wxDragImage::Show(wxWindow* window)
 257 {
 258     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Show."));
 259
 260     HWND hWnd = 0;
 261     if (window)
 262         hWnd = (HWND) window->GetHWND();
 263
 264     bool ret = (ImageList_DragEnter( hWnd, m_position.x, m_position.y ) != 0);
 265
 266     return ret;
 267 }
 268
 269 bool wxDragImage::Hide(wxWindow* window)
 270 {
 271     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Hide."));
 272
 273     HWND hWnd = 0;
 274     if (window)
 275         hWnd = (HWND) window->GetHWND();
 276
 277     bool ret = (ImageList_DragLeave( hWnd ) != 0);
 278
 279     return ret;
 280 }
 281
 282 #endif
 283     // __WIN95__
 284