154 lines
3.1 KiB
Go
154 lines
3.1 KiB
Go
// 8 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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const (
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stdWndClassFormat = "gouiwnd%X"
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)
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var (
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curWndClassNum uintptr
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curWndClassNumLock sync.Mutex
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)
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var (
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defWindowProc = user32.NewProc("DefWindowProcW")
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)
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func stdWndProc(s *sysData) func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lParam _LPARAM) _LRESULT {
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return func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lParam _LPARAM) _LRESULT {
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switch uMsg {
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case _WM_COMMAND:
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id := _HMENU(wParam.LOWORD())
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s.childrenLock.Lock()
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ss := s.children[id]
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s.childrenLock.Unlock()
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switch ss.ctype {
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case c_button:
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if wParam.HIWORD() == _BN_CLICKED {
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ss.event <- struct{}{}
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}
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}
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return 0
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case _WM_GETMINMAXINFO:
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mm := lParam.MINMAXINFO()
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// ... minimum size
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_ = mm
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return 0
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case _WM_SIZE:
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if s.resize != nil {
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var r _RECT
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r1, _, err := _getClientRect.Call(
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uintptr(hwnd),
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uintptr(unsafe.Pointer(&r)))
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if r1 == 0 {
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panic("GetClientRect failed: " + err.Error())
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}
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// run the resize in a goroutine, since the WndProc is being run on uitask
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go func() {
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err = s.resize(int(r.Left), int(r.Top), int(r.Right), int(r.Bottom))
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if err != nil {
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panic("child resize failed: " + err.Error())
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}
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}()
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}
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return 0
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case _WM_CLOSE:
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if s.event != nil {
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s.event <- struct{}{}
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}
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return 0
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default:
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r1, _, _ := defWindowProc.Call(
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uintptr(hwnd),
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uintptr(uMsg),
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uintptr(wParam),
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uintptr(lParam))
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return _LRESULT(r1)
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}
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panic(fmt.Sprintf("stdWndProc message %d did not return: internal bug in ui library", uMsg))
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}
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}
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type _WNDCLASS struct {
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style uint32
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lpfnWndProc uintptr
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cbClsExtra int
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cbWndExtra int
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hInstance _HANDLE
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hIcon _HANDLE
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hCursor _HANDLE
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hbrBackground _HBRUSH
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lpszMenuName *uint16
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lpszClassName uintptr
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}
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var (
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icon, cursor _HANDLE
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)
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var (
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_registerClass = user32.NewProc("RegisterClassW")
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)
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func registerStdWndClass(s *sysData) (newClassName string, err error) {
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curWndClassNumLock.Lock()
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newClassName = fmt.Sprintf(stdWndClassFormat, curWndClassNum)
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curWndClassNum++
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curWndClassNumLock.Unlock()
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wc := &_WNDCLASS{
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lpszClassName: uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(newClassName))),
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lpfnWndProc: syscall.NewCallback(stdWndProc(s)),
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hInstance: hInstance,
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hIcon: icon,
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hCursor: cursor,
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hbrBackground: _HBRUSH(_COLOR_BTNFACE + 1),
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}
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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: _registerClass,
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p: []uintptr{uintptr(unsafe.Pointer(wc))},
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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 newClassName, nil
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}
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func initWndClassInfo() (err error) {
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const (
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_IDI_APPLICATION = 32512
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_IDC_ARROW = 32512
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)
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r1, _, err := user32.NewProc("LoadIconW").Call(
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uintptr(_NULL),
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uintptr(_IDI_APPLICATION))
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if r1 == 0 { // failure
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return fmt.Errorf("error getting window icon: %v", err)
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}
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icon = _HANDLE(r1)
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r1, _, err = user32.NewProc("LoadCursorW").Call(
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uintptr(_NULL),
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uintptr(_IDC_ARROW))
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if r1 == 0 { // failure
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return fmt.Errorf("error getting window cursor: %v", err)
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}
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cursor = _HANDLE(r1)
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return nil
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}
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