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