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 license
  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/msw/private.h"     // includes <windows.h>
  34
  35 // ============================================================================
  36 // implementation
  37 // ============================================================================
  38
  39 // ----------------------------------------------------------------------------
  40 // functions to work with .INI files
  41 // ----------------------------------------------------------------------------
  42
  43 // Reading and writing resources (eg WIN.INI, .Xdefaults)
  44 #if wxUSE_RESOURCES
  45 bool wxWriteResource(const wxString& section, const wxString& entry, const wxString& value, const wxString& file)
  46 {
  47   if (file != wxEmptyString)
  48 // Don't know what the correct cast should be, but it doesn't
  49 // compile in BC++/16-bit without this cast.
  50 #if !defined(__WIN32__)
  51     return (WritePrivateProfileString((const char*) section, (const char*) entry, (const char*) value, (const char*) file) != 0);
  52 #else
  53     return (WritePrivateProfileString((LPCTSTR)WXSTRINGCAST section, (LPCTSTR)WXSTRINGCAST entry, (LPCTSTR)value, (LPCTSTR)WXSTRINGCAST file) != 0);
  54 #endif
  55   else
  56     return (WriteProfileString((LPCTSTR)WXSTRINGCAST section, (LPCTSTR)WXSTRINGCAST entry, (LPCTSTR)WXSTRINGCAST value) != 0);
  57 }
  58
  59 bool wxWriteResource(const wxString& section, const wxString& entry, float value, const wxString& file)
  60 {
  61     wxString buf;
  62     buf.Printf(wxT("%.4f"), value);
  63
  64     return wxWriteResource(section, entry, buf, file);
  65 }
  66
  67 bool wxWriteResource(const wxString& section, const wxString& entry, long value, const wxString& file)
  68 {
  69     wxString buf;
  70     buf.Printf(wxT("%ld"), value);
  71
  72     return wxWriteResource(section, entry, buf, file);
  73 }
  74
  75 bool wxWriteResource(const wxString& section, const wxString& entry, int value, const wxString& file)
  76 {
  77     wxString buf;
  78     buf.Printf(wxT("%d"), value);
  79
  80     return wxWriteResource(section, entry, buf, file);
  81 }
  82
  83 bool wxGetResource(const wxString& section, const wxString& entry, wxChar **value, const wxString& file)
  84 {
  85     static const wxChar defunkt[] = wxT("$$default");
  86
  87     wxChar buf[1024];
  88     if (file != wxEmptyString)
  89     {
  90         int n = GetPrivateProfileString(section, entry, defunkt,
  91                                         buf, WXSIZEOF(buf), file);
  92         if (n == 0 || wxStrcmp(buf, defunkt) == 0)
  93             return FALSE;
  94     }
  95     else
  96     {
  97         int n = GetProfileString(section, entry, defunkt, buf, WXSIZEOF(buf));
  98         if (n == 0 || wxStrcmp(buf, defunkt) == 0)
  99             return FALSE;
 100     }
 101     if (*value) delete[] (*value);
 102     *value = wxStrcpy(new wxChar[wxStrlen(buf) + 1], buf);
 103     return TRUE;
 104 }
 105
 106 bool wxGetResource(const wxString& section, const wxString& entry, float *value, const wxString& file)
 107 {
 108     wxChar *s = NULL;
 109     bool succ = wxGetResource(section, entry, (wxChar **)&s, file);
 110     if (succ)
 111     {
 112         *value = (float)wxStrtod(s, NULL);
 113         delete[] s;
 114         return TRUE;
 115     }
 116     else return FALSE;
 117 }
 118
 119 bool wxGetResource(const wxString& section, const wxString& entry, long *value, const wxString& file)
 120 {
 121     wxChar *s = NULL;
 122     bool succ = wxGetResource(section, entry, (wxChar **)&s, file);
 123     if (succ)
 124     {
 125         *value = wxStrtol(s, NULL, 10);
 126         delete[] s;
 127         return TRUE;
 128     }
 129     else return FALSE;
 130 }
 131
 132 bool wxGetResource(const wxString& section, const wxString& entry, int *value, const wxString& file)
 133 {
 134     wxChar *s = NULL;
 135     bool succ = wxGetResource(section, entry, (wxChar **)&s, file);
 136     if (succ)
 137     {
 138         *value = (int)wxStrtol(s, NULL, 10);
 139         delete[] s;
 140         return TRUE;
 141     }
 142     else return FALSE;
 143 }
 144 #endif // wxUSE_RESOURCES
 145
 146 // ---------------------------------------------------------------------------
 147 // helper functions for showing a "busy" cursor
 148 // ---------------------------------------------------------------------------
 149
 150 static HCURSOR gs_wxBusyCursor = 0;     // new, busy cursor
 151 static HCURSOR gs_wxBusyCursorOld = 0;  // old cursor
 152 static int gs_wxBusyCursorCount = 0;
 153
 154 extern HCURSOR wxGetCurrentBusyCursor()
 155 {
 156     return gs_wxBusyCursor;
 157 }
 158
 159 // Set the cursor to the busy cursor for all windows
 160 void wxBeginBusyCursor(wxCursor *cursor)
 161 {
 162     if ( gs_wxBusyCursorCount++ == 0 )
 163     {
 164         gs_wxBusyCursor = (HCURSOR)cursor->GetHCURSOR();
 165 #ifndef __WXMICROWIN__
 166         gs_wxBusyCursorOld = ::SetCursor(gs_wxBusyCursor);
 167 #endif
 168     }
 169     //else: nothing to do, already set
 170 }
 171
 172 // Restore cursor to normal
 173 void wxEndBusyCursor()
 174 {
 175     wxCHECK_RET( gs_wxBusyCursorCount > 0,
 176                  wxT("no matching wxBeginBusyCursor() for wxEndBusyCursor()") );
 177
 178     if ( --gs_wxBusyCursorCount == 0 )
 179     {
 180 #ifndef __WXMICROWIN__
 181         ::SetCursor(gs_wxBusyCursorOld);
 182 #endif
 183         gs_wxBusyCursorOld = 0;
 184     }
 185 }
 186
 187 // TRUE if we're between the above two calls
 188 bool wxIsBusy()
 189 {
 190   return gs_wxBusyCursorCount > 0;
 191 }
 192
 193 // Check whether this window wants to process messages, e.g. Stop button
 194 // in long calculations.
 195 bool wxCheckForInterrupt(wxWindow *wnd)
 196 {
 197     wxCHECK( wnd, FALSE );
 198
 199     MSG msg;
 200     while ( ::PeekMessage(&msg, GetHwndOf(wnd), 0, 0, PM_REMOVE) )
 201     {
 202         ::TranslateMessage(&msg);
 203         ::DispatchMessage(&msg);
 204     }
 205
 206     return TRUE;
 207 }
 208
 209 // MSW only: get user-defined resource from the .res file.
 210 // Returns NULL or newly-allocated memory, so use delete[] to clean up.
 211
 212 #ifndef __WXMICROWIN__
 213 wxChar *wxLoadUserResource(const wxString& resourceName, const wxString& resourceType)
 214 {
 215     HRSRC hResource = ::FindResource(wxGetInstance(), resourceName, resourceType);
 216     if ( hResource == 0 )
 217         return NULL;
 218
 219     HGLOBAL hData = ::LoadResource(wxGetInstance(), hResource);
 220     if ( hData == 0 )
 221         return NULL;
 222
 223     wxChar *theText = (wxChar *)::LockResource(hData);
 224     if ( !theText )
 225         return NULL;
 226
 227     // Not all compilers put a zero at the end of the resource (e.g. BC++ doesn't).
 228     // so we need to find the length of the resource.
 229     int len = ::SizeofResource(wxGetInstance(), hResource);
 230     wxChar  *s = new wxChar[len+1];
 231     wxStrncpy(s,theText,len);
 232     s[len]=0;
 233
 234     // wxChar *s = copystring(theText);
 235
 236     // Obsolete in WIN32
 237 #ifndef __WIN32__
 238     UnlockResource(hData);
 239 #endif
 240
 241     // No need??
 242     //  GlobalFree(hData);
 243
 244     return s;
 245 }
 246 #endif // __WXMICROWIN__
 247
 248 // ----------------------------------------------------------------------------
 249 // get display info
 250 // ----------------------------------------------------------------------------
 251
 252 // See also the wxGetMousePosition in window.cpp
 253 // Deprecated: use wxPoint wxGetMousePosition() instead
 254 void wxGetMousePosition( int* x, int* y )
 255 {
 256     POINT pt;
 257     GetCursorPos( & pt );
 258     if ( x ) *x = pt.x;
 259     if ( y ) *y = pt.y;
 260 };
 261
 262 // Return TRUE if we have a colour display
 263 bool wxColourDisplay()
 264 {
 265 #ifdef __WXMICROWIN__
 266     // MICROWIN_TODO
 267     return TRUE;
 268 #else
 269     // this function is called from wxDC ctor so it is called a *lot* of times
 270     // hence we optimize it a bit but doign the check only once
 271     //
 272     // this should be MT safe as only the GUI thread (holding the GUI mutex)
 273     // can call us
 274     static int s_isColour = -1;
 275
 276     if ( s_isColour == -1 )
 277     {
 278         ScreenHDC dc;
 279         int noCols = ::GetDeviceCaps(dc, NUMCOLORS);
 280
 281         s_isColour = (noCols == -1) || (noCols > 2);
 282     }
 283
 284     return s_isColour != 0;
 285 #endif
 286 }
 287
 288 // Returns depth of screen
 289 int wxDisplayDepth()
 290 {
 291     ScreenHDC dc;
 292     return GetDeviceCaps(dc, PLANES) * GetDeviceCaps(dc, BITSPIXEL);
 293 }
 294
 295 // Get size of display
 296 void wxDisplaySize(int *width, int *height)
 297 {
 298 #ifdef __WXMICROWIN__
 299     RECT rect;
 300     HWND hWnd = GetDesktopWindow();
 301     ::GetWindowRect(hWnd, & rect);
 302
 303     if ( width )
 304         *width = rect.right - rect.left;
 305     if ( height )
 306         *height = rect.bottom - rect.top;
 307 #else // !__WXMICROWIN__
 308     ScreenHDC dc;
 309
 310     if ( width )
 311         *width = ::GetDeviceCaps(dc, HORZRES);
 312     if ( height )
 313         *height = ::GetDeviceCaps(dc, VERTRES);
 314 #endif // __WXMICROWIN__/!__WXMICROWIN__
 315 }
 316
 317 void wxDisplaySizeMM(int *width, int *height)
 318 {
 319 #ifdef __WXMICROWIN__
 320     // MICROWIN_TODO
 321     if ( width )
 322         *width = 0;
 323     if ( height )
 324         *height = 0;
 325 #else
 326     ScreenHDC dc;
 327
 328     if ( width )
 329         *width = ::GetDeviceCaps(dc, HORZSIZE);
 330     if ( height )
 331         *height = ::GetDeviceCaps(dc, VERTSIZE);
 332 #endif
 333 }
 334
 335 void wxClientDisplayRect(int *x, int *y, int *width, int *height)
 336 {
 337 #if defined(__WXMICROWIN__)
 338     *x = 0; *y = 0;
 339     wxDisplaySize(width, height);
 340 #else
 341     // Determine the desktop dimensions minus the taskbar and any other
 342     // special decorations...
 343     RECT r;
 344
 345     SystemParametersInfo(SPI_GETWORKAREA, 0, &r, 0);
 346     if (x)      *x = r.left;
 347     if (y)      *y = r.top;
 348     if (width)  *width = r.right - r.left;
 349     if (height) *height = r.bottom - r.top;
 350 #endif
 351 }
 352
 353 // ---------------------------------------------------------------------------
 354 // window information functions
 355 // ---------------------------------------------------------------------------
 356
 357 wxString WXDLLEXPORT wxGetWindowText(WXHWND hWnd)
 358 {
 359     wxString str;
 360
 361     if ( hWnd )
 362     {
 363         int len = GetWindowTextLength((HWND)hWnd) + 1;
 364         ::GetWindowText((HWND)hWnd, wxStringBuffer(str, len), len);
 365     }
 366
 367     return str;
 368 }
 369
 370 wxString WXDLLEXPORT wxGetWindowClass(WXHWND hWnd)
 371 {
 372     wxString str;
 373
 374     // MICROWIN_TODO
 375 #ifndef __WXMICROWIN__
 376     if ( hWnd )
 377     {
 378         int len = 256; // some starting value
 379
 380         for ( ;; )
 381         {
 382             int count = ::GetClassName((HWND)hWnd, wxStringBuffer(str, len), len);
 383
 384             if ( count == len )
 385             {
 386                 // the class name might have been truncated, retry with larger
 387                 // buffer
 388                 len *= 2;
 389             }
 390             else
 391             {
 392                 break;
 393             }
 394         }
 395     }
 396 #endif // !__WXMICROWIN__
 397
 398     return str;
 399 }
 400
 401 WXWORD WXDLLEXPORT wxGetWindowId(WXHWND hWnd)
 402 {
 403     return (WXWORD)GetWindowLong((HWND)hWnd, GWL_ID);
 404 }
 405
 406 // ----------------------------------------------------------------------------
 407 // Metafile helpers
 408 // ----------------------------------------------------------------------------
 409
 410 extern void PixelToHIMETRIC(LONG *x, LONG *y)
 411 {
 412     ScreenHDC hdcRef;
 413
 414     int iWidthMM = GetDeviceCaps(hdcRef, HORZSIZE),
 415         iHeightMM = GetDeviceCaps(hdcRef, VERTSIZE),
 416         iWidthPels = GetDeviceCaps(hdcRef, HORZRES),
 417         iHeightPels = GetDeviceCaps(hdcRef, VERTRES);
 418
 419     *x *= (iWidthMM * 100);
 420     *x /= iWidthPels;
 421     *y *= (iHeightMM * 100);
 422     *y /= iHeightPels;
 423 }
 424
 425 extern void HIMETRICToPixel(LONG *x, LONG *y)
 426 {
 427     ScreenHDC hdcRef;
 428
 429     int iWidthMM = GetDeviceCaps(hdcRef, HORZSIZE),
 430         iHeightMM = GetDeviceCaps(hdcRef, VERTSIZE),
 431         iWidthPels = GetDeviceCaps(hdcRef, HORZRES),
 432         iHeightPels = GetDeviceCaps(hdcRef, VERTRES);
 433
 434     *x *= iWidthPels;
 435     *x /= (iWidthMM * 100);
 436     *y *= iHeightPels;
 437     *y /= (iHeightMM * 100);
 438 }
 439
 440 void wxDrawLine(HDC hdc, int x1, int y1, int x2, int y2)
 441 {
 442 #ifdef __WXWINCE__
 443     POINT points[2];
 444     points[0].x = x1;
 445     points[0].y = y1;
 446     points[1].x = x2;
 447     points[1].y = y2;
 448     Polyline(hdc, points, 2);
 449 #else
 450     MoveToEx(hdc, x1, y1, NULL); LineTo((HDC) hdc, x2, y2);
 451 #endif
 452 }
 453
 454