99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
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// 12 july 2014
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package ui
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import (
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"fmt"
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"syscall"
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"unsafe"
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)
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// global messages unique to everything
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const (
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msgRequest = c_WM_APP + 1 + iota // + 1 just to be safe
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)
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var msgwin uintptr
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func uiinit() error {
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if err := initWindows(); err != nil {
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return fmt.Errorf("error initializing package ui on Windows: %v", err)
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}
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if err := makemsgwin(); err != nil {
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return fmt.Errorf("error creating message-only window: %v", err)
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}
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if err := makeWindowWindowClass(); err != nil {
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return fmt.Errorf("error creating Window window class: %v", err)
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}
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return nil
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}
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func uimsgloop() {
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var msg s_MSG
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for {
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res, err := f_GetMessageW(&msg, hNULL, 0, 0)
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if res < 0 {
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panic(fmt.Errorf("error calling GetMessage(): %v", err))
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}
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if res == 0 { // WM_QUIT
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break
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}
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// TODO IsDialogMessage()
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f_TranslateMessage(&msg)
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f_DispatchMessageW(&msg)
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}
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}
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func issue(req *Request) {
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res, err := f_PostMessageW(
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hNULL, // TODO
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msgRequest,
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0,
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t_LPARAM(uintptr(unsafe.Pointer(req))))
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if res == 0 {
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panic(fmt.Errorf("error issuing request: %v", err))
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}
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}
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const msgwinclass = "gouimsgwin"
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func makemsgwin() error {
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var wc s_WNDCLASSW
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wc.lpfnWndProc = syscall.NewCallback(msgwinproc)
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wc.hInstance = hInstance
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wc.hIcon = hDefaultIcon
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wc.hCursor = hArrowCursor
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wc.hbrBackground = c_COLOR_BTNFACE + 1
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wc.lpszClassName = syscall.StringToUTF16Ptr(msgwinclass)
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res, err := f_RegisterClassW(&wc)
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if res == 0 {
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return fmt.Errorf("error registering message-only window class: %v", err)
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}
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msgwin, err = f_CreateWindowExW(
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0,
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wc.lpszClassName,
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syscall.StringToUTF16Ptr("package ui message-only window"),
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0,
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c_CW_USEDEFAULT, c_CW_USEDEFAULT,
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c_CW_USEDEFAULT, c_CW_USEDEFAULT,
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c_HWND_MESSAGE, hNULL, hInstance, nil)
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if msgwin == hNULL {
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return fmt.Errorf("error creating message-only window: %v", err)
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}
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return nil
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}
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func msgwinproc(hwnd uintptr, uMsg t_UINT, wParam t_WPARAM, lParam t_LPARAM) t_LRESULT {
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switch uMsg {
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case msgRequest:
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req := (*Request)(unsafe.Pointer(uintptr(lParam)))
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perform(req)
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return 0
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default:
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return f_DefWindowProcW(hwnd, uMsg, wParam, lParam)
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}
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panic(fmt.Errorf("message-only window procedure does not return a value for message %d (bug in msgwinproc())", uMsg))
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}
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