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 #if !USE_SHARED_LIBRARY
  46 IMPLEMENT_DYNAMIC_CLASS(wxDragImage, wxObject)
  47 #endif
  48
  49 wxDragImage::wxDragImage()
  50 {
  51     m_hImageList = 0;
  52 }
  53
  54 wxDragImage::~wxDragImage()
  55 {
  56         if ( m_hImageList )
  57                 ImageList_Destroy((HIMAGELIST) m_hImageList);
  58         m_hImageList = 0;
  59 }
  60
  61
  62 // Attributes
  63 ////////////////////////////////////////////////////////////////////////////
  64
  65
  66 // Operations
  67 ////////////////////////////////////////////////////////////////////////////
  68
  69 // Create a drag image from a bitmap and optional cursor
  70 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& hotspot)
  71 {
  72         if ( m_hImageList )
  73                 ImageList_Destroy((HIMAGELIST) m_hImageList);
  74         m_hImageList = 0;
  75
  76         UINT flags = 0;
  77     bool mask = TRUE; // ?
  78         if ( mask )
  79                 flags |= ILC_MASK;
  80
  81         m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
  82
  83         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
  84         HBITMAP hBitmap2 = 0;
  85         if ( image.GetMask() )
  86             hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
  87
  88     int index = ImageList_Add((HIMAGELIST) m_hImageList, hBitmap1, hBitmap2);
  89         if ( index == -1 )
  90     {
  91         wxLogError(_("Couldn't add an image to the image list."));
  92     }
  93
  94     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
  95     m_hotspot = hotspot;
  96
  97     return (index != -1) ;
  98 }
  99
 100 // Create a drag image from an icon and optional cursor
 101 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& hotspot)
 102 {
 103         if ( m_hImageList )
 104                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 105         m_hImageList = 0;
 106
 107         UINT flags = 0;
 108     bool mask = TRUE; // ?
 109         if ( mask )
 110                 flags |= ILC_MASK;
 111
 112         m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 113
 114         HICON hIcon = (HICON) image.GetHICON();
 115
 116     int index = ImageList_AddIcon((HIMAGELIST) m_hImageList, hIcon);
 117         if ( index == -1 )
 118     {
 119         wxLogError(_("Couldn't add an image to the image list."));
 120     }
 121
 122     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 123     m_hotspot = hotspot;
 124
 125     return (index != -1) ;
 126 }
 127
 128 // Create a drag image from a string and optional cursor
 129 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor, const wxPoint& hotspot)
 130 {
 131     wxFont font(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 132
 133     long w, h;
 134     wxScreenDC dc;
 135     dc.SetFont(font);
 136     dc.GetTextExtent(str, & w, & h);
 137
 138     wxMemoryDC dc2;
 139     dc2.SetFont(font);
 140     wxBitmap bitmap((int) w, (int) h);
 141     dc2.SelectObject(bitmap);
 142
 143     dc2.SetBackground(* wxWHITE_BRUSH);
 144     dc2.Clear();
 145     dc2.DrawText(str, 0, 0);
 146
 147     dc2.SelectObject(wxNullBitmap);
 148
 149     return Create(bitmap, cursor, hotspot);
 150 }
 151
 152 // Create a drag image for the given tree control item
 153 bool wxDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 154 {
 155         if ( m_hImageList )
 156                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 157     m_hImageList = (WXHIMAGELIST) TreeView_CreateDragImage((HWND) treeCtrl.GetHWND(), (HTREEITEM) (WXHTREEITEM) id);
 158     return TRUE;
 159 }
 160
 161 // Create a drag image for the given list control item
 162 bool wxDragImage::Create(const wxListCtrl& listCtrl, long id)
 163 {
 164         if ( m_hImageList )
 165                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 166     POINT pt;
 167     pt.x = 0; pt.y = 0;
 168     m_hImageList = (WXHIMAGELIST) ListView_CreateDragImage((HWND) listCtrl.GetHWND(), id, & pt);
 169     return TRUE;
 170 }
 171
 172 // Begin drag
 173 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* WXUNUSED(window))
 174 {
 175     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in BeginDrag."));
 176
 177     bool ret = (ImageList_BeginDrag((HIMAGELIST) m_hImageList, 0, hotspot.x, hotspot.y) != 0);
 178
 179     wxASSERT_MSG( (ret), wxT("BeginDrag failed."));
 180
 181     if (!ret)
 182         return FALSE;
 183
 184     if (m_cursor.Ok())
 185     {
 186         // First add the cursor to the image list
 187         int cursorIndex = ImageList_AddIcon((HIMAGELIST) m_hImageList, (HICON) m_cursor.GetHCURSOR());
 188
 189         wxASSERT_MSG( (cursorIndex != -1), wxT("ImageList_AddIcon failed in BeginDrag."));
 190
 191         if (cursorIndex != -1)
 192         {
 193             ImageList_SetDragCursorImage((HIMAGELIST) m_hImageList, cursorIndex, m_hotspot.x, m_hotspot.y);
 194         }
 195     }
 196
 197     ::ShowCursor(FALSE);
 198
 199     return TRUE;
 200 }
 201
 202 // End drag
 203 bool wxDragImage::EndDrag(wxWindow* WXUNUSED(window))
 204 {
 205     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in EndDrag."));
 206
 207     ImageList_EndDrag();
 208
 209     ::ShowCursor(TRUE);
 210
 211     return TRUE;
 212 }
 213
 214 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 215 // is non-NULL, or in screen coordinates if NULL.
 216 bool wxDragImage::Move(const wxPoint& pt, wxWindow* window)
 217 {
 218     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Move."));
 219
 220     // TODO: what coordinates are these in: window, client, or screen?
 221     bool ret = (ImageList_DragMove( pt.x, pt.y ) != 0);
 222
 223     m_position = pt;
 224
 225     return ret;
 226 }
 227
 228 bool wxDragImage::Show(wxWindow* window)
 229 {
 230     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Show."));
 231
 232     HWND hWnd = 0;
 233     if (window)
 234         hWnd = (HWND) window->GetHWND();
 235
 236     bool ret = (ImageList_DragEnter( hWnd, m_position.x, m_position.y ) != 0);
 237
 238     return ret;
 239 }
 240
 241 bool wxDragImage::Hide(wxWindow* window)
 242 {
 243     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Hide."));
 244
 245     HWND hWnd = 0;
 246     if (window)
 247         hWnd = (HWND) window->GetHWND();
 248
 249     bool ret = (ImageList_DragLeave( hWnd ) != 0);
 250
 251     return ret;
 252 }
 253
 254 #endif
 255     // __WIN95__
 256