src/msw/utilsgui.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/utilsgui.cpp
   3 // Purpose:     Various utility functions only available in GUI
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     21.06.2003 (extracted from msw/utils.cpp)
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // License:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // for compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/cursor.h"
  29     #include "wx/window.h"
  30     #include "wx/utils.h"
  31 #endif //WX_PRECOMP
  32
  33 #include "wx/dynlib.h"
  34
  35 #include "wx/msw/private.h"     // includes <windows.h>
  36
  37 // ============================================================================
  38 // implementation
  39 // ============================================================================
  40
  41 // ---------------------------------------------------------------------------
  42 // helper functions for showing a "busy" cursor
  43 // ---------------------------------------------------------------------------
  44
  45 static HCURSOR gs_wxBusyCursor = 0;     // new, busy cursor
  46 static HCURSOR gs_wxBusyCursorOld = 0;  // old cursor
  47 static int gs_wxBusyCursorCount = 0;
  48
  49 extern HCURSOR wxGetCurrentBusyCursor()
  50 {
  51     return gs_wxBusyCursor;
  52 }
  53
  54 // Set the cursor to the busy cursor for all windows
  55 void wxBeginBusyCursor(const wxCursor *cursor)
  56 {
  57     if ( gs_wxBusyCursorCount++ == 0 )
  58     {
  59         gs_wxBusyCursor = (HCURSOR)cursor->GetHCURSOR();
  60 #ifndef __WXMICROWIN__
  61         gs_wxBusyCursorOld = ::SetCursor(gs_wxBusyCursor);
  62 #endif
  63     }
  64     //else: nothing to do, already set
  65 }
  66
  67 // Restore cursor to normal
  68 void wxEndBusyCursor()
  69 {
  70     wxCHECK_RET( gs_wxBusyCursorCount > 0,
  71                  wxT("no matching wxBeginBusyCursor() for wxEndBusyCursor()") );
  72
  73     if ( --gs_wxBusyCursorCount == 0 )
  74     {
  75 #ifndef __WXMICROWIN__
  76         ::SetCursor(gs_wxBusyCursorOld);
  77 #endif
  78         gs_wxBusyCursorOld = 0;
  79     }
  80 }
  81
  82 // true if we're between the above two calls
  83 bool wxIsBusy()
  84 {
  85   return gs_wxBusyCursorCount > 0;
  86 }
  87
  88 // Check whether this window wants to process messages, e.g. Stop button
  89 // in long calculations.
  90 bool wxCheckForInterrupt(wxWindow *wnd)
  91 {
  92     wxCHECK( wnd, false );
  93
  94     MSG msg;
  95     while ( ::PeekMessage(&msg, GetHwndOf(wnd), 0, 0, PM_REMOVE) )
  96     {
  97         ::TranslateMessage(&msg);
  98         ::DispatchMessage(&msg);
  99     }
 100
 101     return true;
 102 }
 103
 104 // MSW only: get user-defined resource from the .res file.
 105 // Returns NULL or newly-allocated memory, so use delete[] to clean up.
 106
 107 #ifndef __WXMICROWIN__
 108 wxChar *wxLoadUserResource(const wxString& resourceName, const wxString& resourceType)
 109 {
 110     HRSRC hResource = ::FindResource(wxGetInstance(), resourceName, resourceType);
 111     if ( hResource == 0 )
 112         return NULL;
 113
 114     HGLOBAL hData = ::LoadResource(wxGetInstance(), hResource);
 115     if ( hData == 0 )
 116         return NULL;
 117
 118     wxChar *theText = (wxChar *)::LockResource(hData);
 119     if ( !theText )
 120         return NULL;
 121
 122     // Not all compilers put a zero at the end of the resource (e.g. BC++ doesn't).
 123     // so we need to find the length of the resource.
 124     int len = ::SizeofResource(wxGetInstance(), hResource);
 125     wxChar  *s = new wxChar[len+1];
 126     wxStrncpy(s,theText,len);
 127     s[len]=0;
 128
 129     // Obsolete in WIN32
 130 #ifndef __WIN32__
 131     UnlockResource(hData);
 132 #endif
 133
 134     // No need??
 135     //  GlobalFree(hData);
 136
 137     return s;
 138 }
 139 #endif // __WXMICROWIN__
 140
 141 // ----------------------------------------------------------------------------
 142 // get display info
 143 // ----------------------------------------------------------------------------
 144
 145 // See also the wxGetMousePosition in window.cpp
 146 // Deprecated: use wxPoint wxGetMousePosition() instead
 147 void wxGetMousePosition( int* x, int* y )
 148 {
 149     POINT pt;
 150     GetCursorPos( & pt );
 151     if ( x ) *x = pt.x;
 152     if ( y ) *y = pt.y;
 153 }
 154
 155 // Return true if we have a colour display
 156 bool wxColourDisplay()
 157 {
 158 #ifdef __WXMICROWIN__
 159     // MICROWIN_TODO
 160     return true;
 161 #else
 162     // this function is called from wxDC ctor so it is called a *lot* of times
 163     // hence we optimize it a bit but doing the check only once
 164     //
 165     // this should be MT safe as only the GUI thread (holding the GUI mutex)
 166     // can call us
 167     static int s_isColour = -1;
 168
 169     if ( s_isColour == -1 )
 170     {
 171         ScreenHDC dc;
 172         int noCols = ::GetDeviceCaps(dc, NUMCOLORS);
 173
 174         s_isColour = (noCols == -1) || (noCols > 2);
 175     }
 176
 177     return s_isColour != 0;
 178 #endif
 179 }
 180
 181 // Returns depth of screen
 182 int wxDisplayDepth()
 183 {
 184     ScreenHDC dc;
 185     return GetDeviceCaps(dc, PLANES) * GetDeviceCaps(dc, BITSPIXEL);
 186 }
 187
 188 // Get size of display
 189 void wxDisplaySize(int *width, int *height)
 190 {
 191 #ifdef __WXMICROWIN__
 192     RECT rect;
 193     HWND hWnd = GetDesktopWindow();
 194     ::GetWindowRect(hWnd, & rect);
 195
 196     if ( width )
 197         *width = rect.right - rect.left;
 198     if ( height )
 199         *height = rect.bottom - rect.top;
 200 #else // !__WXMICROWIN__
 201     ScreenHDC dc;
 202
 203     if ( width )
 204         *width = ::GetDeviceCaps(dc, HORZRES);
 205     if ( height )
 206         *height = ::GetDeviceCaps(dc, VERTRES);
 207 #endif // __WXMICROWIN__/!__WXMICROWIN__
 208 }
 209
 210 void wxDisplaySizeMM(int *width, int *height)
 211 {
 212 #ifdef __WXMICROWIN__
 213     // MICROWIN_TODO
 214     if ( width )
 215         *width = 0;
 216     if ( height )
 217         *height = 0;
 218 #else
 219     ScreenHDC dc;
 220
 221     if ( width )
 222         *width = ::GetDeviceCaps(dc, HORZSIZE);
 223     if ( height )
 224         *height = ::GetDeviceCaps(dc, VERTSIZE);
 225 #endif
 226 }
 227
 228 void wxClientDisplayRect(int *x, int *y, int *width, int *height)
 229 {
 230 #if defined(__WXMICROWIN__)
 231     *x = 0; *y = 0;
 232     wxDisplaySize(width, height);
 233 #else
 234     // Determine the desktop dimensions minus the taskbar and any other
 235     // special decorations...
 236     RECT r;
 237
 238     SystemParametersInfo(SPI_GETWORKAREA, 0, &r, 0);
 239     if (x)      *x = r.left;
 240     if (y)      *y = r.top;
 241     if (width)  *width = r.right - r.left;
 242     if (height) *height = r.bottom - r.top;
 243 #endif
 244 }
 245
 246 // ---------------------------------------------------------------------------
 247 // window information functions
 248 // ---------------------------------------------------------------------------
 249
 250 wxString WXDLLEXPORT wxGetWindowText(WXHWND hWnd)
 251 {
 252     wxString str;
 253
 254     if ( hWnd )
 255     {
 256         int len = GetWindowTextLength((HWND)hWnd) + 1;
 257         ::GetWindowText((HWND)hWnd, wxStringBuffer(str, len), len);
 258     }
 259
 260     return str;
 261 }
 262
 263 wxString WXDLLEXPORT wxGetWindowClass(WXHWND hWnd)
 264 {
 265     wxString str;
 266
 267     // MICROWIN_TODO
 268 #ifndef __WXMICROWIN__
 269     if ( hWnd )
 270     {
 271         int len = 256; // some starting value
 272
 273         for ( ;; )
 274         {
 275             int count = ::GetClassName((HWND)hWnd, wxStringBuffer(str, len), len);
 276
 277             if ( count == len )
 278             {
 279                 // the class name might have been truncated, retry with larger
 280                 // buffer
 281                 len *= 2;
 282             }
 283             else
 284             {
 285                 break;
 286             }
 287         }
 288     }
 289 #endif // !__WXMICROWIN__
 290
 291     return str;
 292 }
 293
 294 WXWORD WXDLLEXPORT wxGetWindowId(WXHWND hWnd)
 295 {
 296     return (WXWORD)GetWindowLong((HWND)hWnd, GWL_ID);
 297 }
 298
 299 // ----------------------------------------------------------------------------
 300 // Metafile helpers
 301 // ----------------------------------------------------------------------------
 302
 303 extern void PixelToHIMETRIC(LONG *x, LONG *y)
 304 {
 305     ScreenHDC hdcRef;
 306
 307     int iWidthMM = GetDeviceCaps(hdcRef, HORZSIZE),
 308         iHeightMM = GetDeviceCaps(hdcRef, VERTSIZE),
 309         iWidthPels = GetDeviceCaps(hdcRef, HORZRES),
 310         iHeightPels = GetDeviceCaps(hdcRef, VERTRES);
 311
 312     *x *= (iWidthMM * 100);
 313     *x /= iWidthPels;
 314     *y *= (iHeightMM * 100);
 315     *y /= iHeightPels;
 316 }
 317
 318 extern void HIMETRICToPixel(LONG *x, LONG *y)
 319 {
 320     ScreenHDC hdcRef;
 321
 322     int iWidthMM = GetDeviceCaps(hdcRef, HORZSIZE),
 323         iHeightMM = GetDeviceCaps(hdcRef, VERTSIZE),
 324         iWidthPels = GetDeviceCaps(hdcRef, HORZRES),
 325         iHeightPels = GetDeviceCaps(hdcRef, VERTRES);
 326
 327     *x *= iWidthPels;
 328     *x /= (iWidthMM * 100);
 329     *y *= iHeightPels;
 330     *y /= (iHeightMM * 100);
 331 }
 332
 333 void wxDrawLine(HDC hdc, int x1, int y1, int x2, int y2)
 334 {
 335 #ifdef __WXWINCE__
 336     POINT points[2];
 337     points[0].x = x1;
 338     points[0].y = y1;
 339     points[1].x = x2;
 340     points[1].y = y2;
 341     Polyline(hdc, points, 2);
 342 #else
 343     MoveToEx(hdc, x1, y1, NULL); LineTo((HDC) hdc, x2, y2);
 344 #endif
 345 }
 346
 347
 348 // ----------------------------------------------------------------------------
 349 // Shell API wrappers
 350 // ----------------------------------------------------------------------------
 351
 352 extern bool wxEnableFileNameAutoComplete(HWND hwnd)
 353 {
 354 #if wxUSE_DYNLIB_CLASS
 355     typedef HRESULT (WINAPI *SHAutoComplete_t)(HWND, DWORD);
 356
 357     static SHAutoComplete_t s_pfnSHAutoComplete = NULL;
 358     static bool s_initialized = false;
 359
 360     if ( !s_initialized )
 361     {
 362         s_initialized = true;
 363
 364         wxLogNull nolog;
 365         wxDynamicLibrary dll(_T("shlwapi.dll"));
 366         if ( dll.IsLoaded() )
 367         {
 368             s_pfnSHAutoComplete =
 369                 (SHAutoComplete_t)dll.GetSymbol(_T("SHAutoComplete"));
 370             if ( s_pfnSHAutoComplete )
 371             {
 372                 // won't be unloaded until the process termination, no big deal
 373                 dll.Detach();
 374             }
 375         }
 376     }
 377
 378     if ( !s_pfnSHAutoComplete )
 379         return false;
 380
 381     HRESULT hr = s_pfnSHAutoComplete(hwnd, 0x10 /* SHACF_FILESYS_ONLY */);
 382     if ( FAILED(hr) )
 383     {
 384         wxLogApiError(_T("SHAutoComplete"), hr);
 385         return false;
 386     }
 387
 388     return true;
 389 #else
 390     wxUnusedVar(hwnd);
 391     return false;
 392 #endif // wxUSE_DYNLIB_CLASS/!wxUSE_DYNLIB_CLASS
 393 }
 394