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 #ifdef __GNUG__
  13 #pragma implementation "dragimag.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #if defined(__WIN95__)
  24
  25 #ifndef WX_PRECOMP
  26 #include <stdio.h>
  27 #include "wx/setup.h"
  28 #include "wx/window.h"
  29 #include "wx/dcclient.h"
  30 #include "wx/dcscreen.h"
  31 #include "wx/dcmemory.h"
  32 #include "wx/settings.h"
  33 #endif
  34
  35 #include "wx/log.h"
  36 #include "wx/intl.h"
  37
  38 #include "wx/msw/dragimag.h"
  39 #include "wx/msw/private.h"
  40
  41 #if (defined(__WIN95__) && !defined(__GNUWIN32__)) || defined(__TWIN32__) || defined(wxUSE_NORLANDER_HEADERS)
  42 #include <commctrl.h>
  43 #endif
  44
  45 IMPLEMENT_DYNAMIC_CLASS(wxDragImage, wxObject)
  46
  47 wxDragImage::wxDragImage()
  48 {
  49     m_hImageList = 0;
  50 }
  51
  52 wxDragImage::~wxDragImage()
  53 {
  54         if ( m_hImageList )
  55                 ImageList_Destroy((HIMAGELIST) m_hImageList);
  56         m_hImageList = 0;
  57 }
  58
  59
  60 // Attributes
  61 ////////////////////////////////////////////////////////////////////////////
  62
  63
  64 // Operations
  65 ////////////////////////////////////////////////////////////////////////////
  66
  67 // Create a drag image from a bitmap and optional cursor
  68 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& hotspot)
  69 {
  70         if ( m_hImageList )
  71                 ImageList_Destroy((HIMAGELIST) m_hImageList);
  72         m_hImageList = 0;
  73
  74         UINT flags = 0;
  75     bool mask = TRUE; // ?
  76         if ( mask )
  77                 flags |= ILC_MASK;
  78
  79         m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
  80
  81         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
  82         HBITMAP hBitmap2 = 0;
  83         if ( image.GetMask() )
  84             hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
  85
  86     int index = ImageList_Add((HIMAGELIST) m_hImageList, hBitmap1, hBitmap2);
  87         if ( index == -1 )
  88     {
  89         wxLogError(_("Couldn't add an image to the image list."));
  90     }
  91
  92     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
  93     m_hotspot = hotspot;
  94
  95     return (index != -1) ;
  96 }
  97
  98 // Create a drag image from an icon and optional cursor
  99 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& hotspot)
 100 {
 101         if ( m_hImageList )
 102                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 103         m_hImageList = 0;
 104
 105         UINT flags = 0;
 106     bool mask = TRUE; // ?
 107         if ( mask )
 108                 flags |= ILC_MASK;
 109
 110         m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 111
 112         HICON hIcon = (HICON) image.GetHICON();
 113
 114     int index = ImageList_AddIcon((HIMAGELIST) m_hImageList, hIcon);
 115         if ( index == -1 )
 116     {
 117         wxLogError(_("Couldn't add an image to the image list."));
 118     }
 119
 120     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 121     m_hotspot = hotspot;
 122
 123     return (index != -1) ;
 124 }
 125
 126 // Create a drag image from a string and optional cursor
 127 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor, const wxPoint& hotspot)
 128 {
 129     wxFont font(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 130
 131     long w, h;
 132     wxScreenDC dc;
 133     dc.SetFont(font);
 134     dc.GetTextExtent(str, & w, & h);
 135
 136     wxMemoryDC dc2;
 137     dc2.SetFont(font);
 138     wxBitmap bitmap((int) w, (int) h);
 139     dc2.SelectObject(bitmap);
 140
 141     dc2.SetBackground(* wxWHITE_BRUSH);
 142     dc2.Clear();
 143     dc2.DrawText(str, 0, 0);
 144
 145     dc2.SelectObject(wxNullBitmap);
 146
 147     return Create(bitmap, cursor, hotspot);
 148 }
 149
 150 // Create a drag image for the given tree control item
 151 bool wxDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 152 {
 153         if ( m_hImageList )
 154                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 155     m_hImageList = (WXHIMAGELIST) TreeView_CreateDragImage((HWND) treeCtrl.GetHWND(), (HTREEITEM) (WXHTREEITEM) id);
 156     return TRUE;
 157 }
 158
 159 // Create a drag image for the given list control item
 160 bool wxDragImage::Create(const wxListCtrl& listCtrl, long id)
 161 {
 162         if ( m_hImageList )
 163                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 164     POINT pt;
 165     pt.x = 0; pt.y = 0;
 166     m_hImageList = (WXHIMAGELIST) ListView_CreateDragImage((HWND) listCtrl.GetHWND(), id, & pt);
 167     return TRUE;
 168 }
 169
 170 // Begin drag
 171 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* WXUNUSED(window))
 172 {
 173     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in BeginDrag."));
 174
 175     bool ret = (ImageList_BeginDrag((HIMAGELIST) m_hImageList, 0, hotspot.x, hotspot.y) != 0);
 176
 177     wxASSERT_MSG( (ret), wxT("BeginDrag failed."));
 178
 179     if (!ret)
 180         return FALSE;
 181
 182     if (m_cursor.Ok())
 183     {
 184         // First add the cursor to the image list
 185         int cursorIndex = ImageList_AddIcon((HIMAGELIST) m_hImageList, (HICON) m_cursor.GetHCURSOR());
 186
 187         wxASSERT_MSG( (cursorIndex != -1), wxT("ImageList_AddIcon failed in BeginDrag."));
 188
 189         if (cursorIndex != -1)
 190         {
 191             ImageList_SetDragCursorImage((HIMAGELIST) m_hImageList, cursorIndex, m_hotspot.x, m_hotspot.y);
 192         }
 193     }
 194
 195     ::ShowCursor(FALSE);
 196
 197     return TRUE;
 198 }
 199
 200 // End drag
 201 bool wxDragImage::EndDrag(wxWindow* WXUNUSED(window))
 202 {
 203     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in EndDrag."));
 204
 205     ImageList_EndDrag();
 206
 207     ::ShowCursor(TRUE);
 208
 209     return TRUE;
 210 }
 211
 212 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 213 // is non-NULL, or in screen coordinates if NULL.
 214 bool wxDragImage::Move(const wxPoint& pt, wxWindow* window)
 215 {
 216     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Move."));
 217
 218     // TODO: what coordinates are these in: window, client, or screen?
 219     bool ret = (ImageList_DragMove( pt.x, pt.y ) != 0);
 220
 221     m_position = pt;
 222
 223     return ret;
 224 }
 225
 226 bool wxDragImage::Show(wxWindow* window)
 227 {
 228     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Show."));
 229
 230     HWND hWnd = 0;
 231     if (window)
 232         hWnd = (HWND) window->GetHWND();
 233
 234     bool ret = (ImageList_DragEnter( hWnd, m_position.x, m_position.y ) != 0);
 235
 236     return ret;
 237 }
 238
 239 bool wxDragImage::Hide(wxWindow* window)
 240 {
 241     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Hide."));
 242
 243     HWND hWnd = 0;
 244     if (window)
 245         hWnd = (HWND) window->GetHWND();
 246
 247     bool ret = (ImageList_DragLeave( hWnd ) != 0);
 248
 249     return ret;
 250 }
 251
 252 #endif
 253     // __WIN95__
 254