164 lines
3.0 KiB
Go
164 lines
3.0 KiB
Go
// 11 february 2014
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package main
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import (
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"fmt"
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"syscall"
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"unsafe"
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"sync"
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)
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type sysData struct {
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cSysData
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hwnd _HWND
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cid _HMENU
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shownAlready bool
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}
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type classData struct {
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name string
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style uint32
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xstyle uint32
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mkid bool
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}
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const controlstyle = _WS_CHILD | _WS_VISIBLE | _WS_TABSTOP
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const controlxstyle = 0
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var classTypes = [nctypes]*classData{
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c_window: &classData{
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name: stdWndClass,
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style: _WS_OVERLAPPEDWINDOW,
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xstyle: 0,
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},
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c_button: &classData{
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name: "BUTTON",
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style: _BS_PUSHBUTTON | controlstyle,
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xstyle: 0 | controlxstyle,
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mkid: true,
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},
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}
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var (
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cid _HMENU = 0
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cidLock sync.Mutex
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)
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func nextID() _HMENU {
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cidLock.Lock()
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defer cidLock.Unlock()
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cid++
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return cid
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}
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func (s *sysData) make(initText string, initWidth int, initHeight int) (err error) {
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ret := make(chan uiret)
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defer close(ret)
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ct := classTypes[s.ctype]
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pwin := uintptr(_NULL)
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if ct.mkid {
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s.cid = nextID()
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pwin = uintptr(s.parentWindow.hwnd)
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}
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uitask <- &uimsg{
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call: _createWindowEx,
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p: []uintptr{
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uintptr(ct.xstyle),
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uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(ct.name))),
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uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(initText))),
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uintptr(ct.style),
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uintptr(_CW_USEDEFAULT), // TODO
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uintptr(_CW_USEDEFAULT),
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uintptr(initWidth),
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uintptr(initHeight),
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pwin,
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uintptr(s.cid),
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uintptr(hInstance),
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uintptr(_NULL),
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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 r.err
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}
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s.hwnd = _HWND(r.ret)
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addSysData(s.hwnd, s)
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if ct.mkid {
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addSysDataID(s.cid, s)
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}
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return nil
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}
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var (
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_updateWindow = user32.NewProc("UpdateWindow")
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)
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// if the object is a window, we need to do the following the first time
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// ShowWindow(hwnd, nCmdShow);
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// UpdateWindow(hwnd);
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// otherwise we go ahead and show the object normally with SW_SHOW
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func (s *sysData) show() (err error) {
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if s.ctype != c_window { // don't do the init ShowWindow/UpdateWindow chain on non-windows
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s.shownAlready = true
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}
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show := uintptr(_SW_SHOW)
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if !s.shownAlready {
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show = uintptr(nCmdShow)
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}
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ret := make(chan uiret)
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defer close(ret)
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// TODO figure out how to handle error
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uitask <- &uimsg{
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call: _showWindow,
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p: []uintptr{uintptr(s.hwnd), show},
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ret: ret,
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}
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<-ret
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if !s.shownAlready {
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uitask <- &uimsg{
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call: _updateWindow,
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p: []uintptr{uintptr(s.hwnd)},
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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 updating window for the first time: %v", r.err)
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}
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s.shownAlready = true
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}
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return nil
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}
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func (s *sysData) hide() (err error) {
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ret := make(chan uiret)
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defer close(ret)
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// TODO figure out how to handle error
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uitask <- &uimsg{
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call: _showWindow,
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p: []uintptr{uintptr(s.hwnd), _SW_HIDE},
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ret: ret,
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}
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<-ret
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return nil
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}
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func (s *sysData) setText(text string) error {
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ret := make(chan uiret)
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defer close(ret)
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uitask <- &uimsg{
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call: _setWindowText,
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p: []uintptr{
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uintptr(s.hwnd),
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uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(text))),
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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 r.err
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}
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return nil
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}
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