LRESULT WM_SIZE(int /*long*/ wParam, int /*long*/ lParam) {
LRESULT result = super.WM_SIZE(wParam, lParam);
if (result != null) return result;
/*
* Feature in Windows. When a progress bar with the style
* PBS_MARQUEE becomes too small, the animation (currently
* a small bar moving from right to left) does not have
* enough space to draw. The result is that the progress
* bar does not appear to be moving. The fix is to detect
* this case, clear the PBS_MARQUEE style and emulate the
* animation using PBM_STEPIT.
*
* NOTE: This only happens on Window XP.
*/
if ((style & SWT.INDETERMINATE) != 0) {
if (OS.WIN32_VERSION == OS.VERSION(5, 1) || (OS.COMCTL32_MAJOR >= 6 && !OS.IsAppThemed())) {
forceResize();
RECT rect = new RECT();
OS.GetClientRect(handle, rect);
int oldBits = OS.GetWindowLong(handle, OS.GWL_STYLE);
int newBits = oldBits;
if (rect.right - rect.left < MINIMUM_WIDTH) {
newBits &= ~OS.PBS_MARQUEE;
} else {
newBits |= OS.PBS_MARQUEE;
}
if (newBits != oldBits) {
stopTimer();
OS.SetWindowLong(handle, OS.GWL_STYLE, newBits);
startTimer();
}
}
}
return result;
}
void releaseWidget() {
super.releaseWidget();
stopTimer();
}