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