48 lines
1.6 KiB
Go
48 lines
1.6 KiB
Go
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func (s *sysData) setWindowSize(width int, height int) error {
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var rect _RECT
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ret := make(chan uiret)
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defer close(ret)
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// we need the size to cover only the client rect
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// unfortunately, Windows only provides general client->window rect conversion functions (AdjustWindowRect()/AdjustWindowRectEx()), not any that can pull from an existing window
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// so as long as we don't change the window styles during execution we're good
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// now we tell it to adjust (0,0)..(width,height); this will give us the approrpiate rect to get the proper width/height from
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// then we call SetWindowPos() to set the size without moving the window
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// see also: http://blogs.msdn.com/b/oldnewthing/archive/2003/09/11/54885.aspx
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// TODO do the WM_NCCALCSIZE stuff on that post when adding menus
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rect.Right = int32(width)
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rect.Bottom = int32(height)
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uitask <- &uimsg{
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call: _adjustWindowRectEx,
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p: []uintptr{
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uintptr(unsafe.Pointer(&rect)),
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uintptr(classTypes[c_window].style),
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uintptr(_FALSE), // TODO change this when adding menus
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uintptr(classTypes[c_window].xstyle),
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},
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ret: ret,
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}
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r := <-ret
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if r.ret == 0 { // failure
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panic(fmt.Errorf("error computing window rect from client rect for resize: %v", r.err))
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}
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uitask <- &uimsg{
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call: _setWindowPos,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(_NULL), // not changing the Z-order
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uintptr(0),
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uintptr(0),
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uintptr(rect.Right - rect.Left),
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uintptr(rect.Bottom - rect.Top),
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uintptr(_SWP_NOMOVE | _SWP_NOZORDER),
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},
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ret: ret,
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}
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r = <-ret
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if r.ret == 0 { // failure
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return fmt.Errorf("error actually resizing window: %v", r.err)
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}
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return nil
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}
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