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 #include "wx/msw/private.h"
  19
  20 #ifdef __BORLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #if defined(__WIN95__)
  25
  26 #ifndef WX_PRECOMP
  27 #include <stdio.h>
  28 #include "wx/setup.h"
  29 #include "wx/window.h"
  30 #include "wx/dcclient.h"
  31 #include "wx/dcscreen.h"
  32 #include "wx/dcmemory.h"
  33 #include "wx/settings.h"
  34 #endif
  35
  36 #include "wx/log.h"
  37 #include "wx/intl.h"
  38
  39 #include "wx/msw/dragimag.h"
  40 #include "wx/msw/private.h"
  41
  42 #if (defined(__WIN95__) && !defined(__GNUWIN32__)) || defined(__TWIN32__) || defined(wxUSE_NORLANDER_HEADERS)
  43 #include <commctrl.h>
  44 #endif
  45
  46 IMPLEMENT_DYNAMIC_CLASS(wxDragImage, wxObject)
  47
  48 wxDragImage::wxDragImage()
  49 {
  50     m_hImageList = 0;
  51 }
  52
  53 wxDragImage::~wxDragImage()
  54 {
  55         if ( m_hImageList )
  56                 ImageList_Destroy((HIMAGELIST) m_hImageList);
  57         m_hImageList = 0;
  58 }
  59
  60
  61 // Attributes
  62 ////////////////////////////////////////////////////////////////////////////
  63
  64
  65 // Operations
  66 ////////////////////////////////////////////////////////////////////////////
  67
  68 // Create a drag image from a bitmap and optional cursor
  69 bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor, const wxPoint& hotspot)
  70 {
  71         if ( m_hImageList )
  72                 ImageList_Destroy((HIMAGELIST) m_hImageList);
  73         m_hImageList = 0;
  74
  75         UINT flags = 0;
  76     bool mask = TRUE; // ?
  77         if ( mask )
  78                 flags |= ILC_MASK;
  79
  80         m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
  81
  82         HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
  83         HBITMAP hBitmap2 = 0;
  84         if ( image.GetMask() )
  85             hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
  86
  87     int index = ImageList_Add((HIMAGELIST) m_hImageList, hBitmap1, hBitmap2);
  88         if ( index == -1 )
  89     {
  90         wxLogError(_("Couldn't add an image to the image list."));
  91     }
  92
  93     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
  94     m_hotspot = hotspot;
  95
  96     return (index != -1) ;
  97 }
  98
  99 // Create a drag image from an icon and optional cursor
 100 bool wxDragImage::Create(const wxIcon& image, const wxCursor& cursor, const wxPoint& hotspot)
 101 {
 102         if ( m_hImageList )
 103                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 104         m_hImageList = 0;
 105
 106         UINT flags = 0;
 107     bool mask = TRUE; // ?
 108         if ( mask )
 109                 flags |= ILC_MASK;
 110
 111         m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);
 112
 113         HICON hIcon = (HICON) image.GetHICON();
 114
 115     int index = ImageList_AddIcon((HIMAGELIST) m_hImageList, hIcon);
 116         if ( index == -1 )
 117     {
 118         wxLogError(_("Couldn't add an image to the image list."));
 119     }
 120
 121     m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.
 122     m_hotspot = hotspot;
 123
 124     return (index != -1) ;
 125 }
 126
 127 // Create a drag image from a string and optional cursor
 128 bool wxDragImage::Create(const wxString& str, const wxCursor& cursor, const wxPoint& hotspot)
 129 {
 130     wxFont font(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 131
 132     long w, h;
 133     wxScreenDC dc;
 134     dc.SetFont(font);
 135     dc.GetTextExtent(str, & w, & h);
 136
 137     wxMemoryDC dc2;
 138     dc2.SetFont(font);
 139     wxBitmap bitmap((int) w, (int) h);
 140     dc2.SelectObject(bitmap);
 141
 142     dc2.SetBackground(* wxWHITE_BRUSH);
 143     dc2.Clear();
 144     dc2.DrawText(str, 0, 0);
 145
 146     dc2.SelectObject(wxNullBitmap);
 147
 148     return Create(bitmap, cursor, hotspot);
 149 }
 150
 151 // Create a drag image for the given tree control item
 152 bool wxDragImage::Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id)
 153 {
 154         if ( m_hImageList )
 155                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 156     m_hImageList = (WXHIMAGELIST) TreeView_CreateDragImage((HWND) treeCtrl.GetHWND(), (HTREEITEM) (WXHTREEITEM) id);
 157     return TRUE;
 158 }
 159
 160 // Create a drag image for the given list control item
 161 bool wxDragImage::Create(const wxListCtrl& listCtrl, long id)
 162 {
 163         if ( m_hImageList )
 164                 ImageList_Destroy((HIMAGELIST) m_hImageList);
 165     POINT pt;
 166     pt.x = 0; pt.y = 0;
 167     m_hImageList = (WXHIMAGELIST) ListView_CreateDragImage((HWND) listCtrl.GetHWND(), id, & pt);
 168     return TRUE;
 169 }
 170
 171 // Begin drag
 172 bool wxDragImage::BeginDrag(const wxPoint& hotspot, wxWindow* WXUNUSED(window))
 173 {
 174     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in BeginDrag."));
 175
 176     bool ret = (ImageList_BeginDrag((HIMAGELIST) m_hImageList, 0, hotspot.x, hotspot.y) != 0);
 177
 178     wxASSERT_MSG( (ret), wxT("BeginDrag failed."));
 179
 180     if (!ret)
 181         return FALSE;
 182
 183     if (m_cursor.Ok())
 184     {
 185         // First add the cursor to the image list
 186         int cursorIndex = ImageList_AddIcon((HIMAGELIST) m_hImageList, (HICON) m_cursor.GetHCURSOR());
 187
 188         wxASSERT_MSG( (cursorIndex != -1), wxT("ImageList_AddIcon failed in BeginDrag."));
 189
 190         if (cursorIndex != -1)
 191         {
 192             ImageList_SetDragCursorImage((HIMAGELIST) m_hImageList, cursorIndex, m_hotspot.x, m_hotspot.y);
 193         }
 194     }
 195
 196     ::ShowCursor(FALSE);
 197
 198     return TRUE;
 199 }
 200
 201 // End drag
 202 bool wxDragImage::EndDrag(wxWindow* WXUNUSED(window))
 203 {
 204     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in EndDrag."));
 205
 206     ImageList_EndDrag();
 207
 208     ::ShowCursor(TRUE);
 209
 210     return TRUE;
 211 }
 212
 213 // Move the image: call from OnMouseMove. Pt is in window client coordinates if window
 214 // is non-NULL, or in screen coordinates if NULL.
 215 bool wxDragImage::Move(const wxPoint& pt, wxWindow* window)
 216 {
 217     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Move."));
 218
 219     // TODO: what coordinates are these in: window, client, or screen?
 220     bool ret = (ImageList_DragMove( pt.x, pt.y ) != 0);
 221
 222     m_position = pt;
 223
 224     return ret;
 225 }
 226
 227 bool wxDragImage::Show(wxWindow* window)
 228 {
 229     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Show."));
 230
 231     HWND hWnd = 0;
 232     if (window)
 233         hWnd = (HWND) window->GetHWND();
 234
 235     bool ret = (ImageList_DragEnter( hWnd, m_position.x, m_position.y ) != 0);
 236
 237     return ret;
 238 }
 239
 240 bool wxDragImage::Hide(wxWindow* window)
 241 {
 242     wxASSERT_MSG( (m_hImageList != 0), wxT("Image list must not be null in Hide."));
 243
 244     HWND hWnd = 0;
 245     if (window)
 246         hWnd = (HWND) window->GetHWND();
 247
 248     bool ret = (ImageList_DragLeave( hWnd ) != 0);
 249
 250     return ret;
 251 }
 252
 253 #endif
 254     // __WIN95__
 255