func fitRectToScreen(hWnd win.HWND, r Rectangle) Rectangle {
var mi win.MONITORINFO
mi.CbSize = uint32(unsafe.Sizeof(mi))
if !win.GetMonitorInfo(win.MonitorFromWindow(
hWnd, win.MONITOR_DEFAULTTOPRIMARY), &mi) {
return r
}
mon := rectangleFromRECT(mi.RcWork)
mon.Height -= int(win.GetSystemMetrics(win.SM_CYCAPTION))
if r.Width <= mon.Width {
switch {
case r.X < mon.X:
r.X = mon.X
case r.X+r.Width > mon.X+mon.Width:
r.X = mon.X + mon.Width - r.Width
}
}
if r.Height <= mon.Height {
switch {
case r.Y < mon.Y:
r.Y = mon.Y
case r.Y+r.Height > mon.Y+mon.Height:
r.Y = mon.Y + mon.Height - r.Height
}
}
return r
}
func (mw *MainWindow) SetFullscreen(fullscreen bool) error {
if fullscreen == mw.Fullscreen() {
return nil
}
if fullscreen {
var mi win.MONITORINFO
mi.CbSize = uint32(unsafe.Sizeof(mi))
if mw.windowPlacement == nil {
mw.windowPlacement = new(win.WINDOWPLACEMENT)
}
if !win.GetWindowPlacement(mw.hWnd, mw.windowPlacement) {
return lastError("GetWindowPlacement")
}
if !win.GetMonitorInfo(win.MonitorFromWindow(
mw.hWnd, win.MONITOR_DEFAULTTOPRIMARY), &mi) {
return newError("GetMonitorInfo")
}
if err := mw.ensureStyleBits(win.WS_OVERLAPPEDWINDOW, false); err != nil {
return err
}
if r := mi.RcMonitor; !win.SetWindowPos(
mw.hWnd, win.HWND_TOP,
r.Left, r.Top, r.Right-r.Left, r.Bottom-r.Top,
win.SWP_FRAMECHANGED|win.SWP_NOOWNERZORDER) {
return lastError("SetWindowPos")
}
} else {
if err := mw.ensureStyleBits(win.WS_OVERLAPPEDWINDOW, true); err != nil {
return err
}
if !win.SetWindowPlacement(mw.hWnd, mw.windowPlacement) {
return lastError("SetWindowPlacement")
}
if !win.SetWindowPos(mw.hWnd, 0, 0, 0, 0, 0, win.SWP_FRAMECHANGED|win.SWP_NOMOVE|
win.SWP_NOOWNERZORDER|win.SWP_NOSIZE|win.SWP_NOZORDER) {
return lastError("SetWindowPos")
}
}
return nil
}