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// 11 february 2014
//package ui
package main
import (
"fmt"
"syscall"
"unsafe"
"runtime"
)
var uitask chan *uimsg
type uimsg struct {
call *syscall.LazyProc
p []uintptr
ret chan uiret
}
type uiret struct {
ret uintptr
err error
}
func ui(initDone chan error) {
runtime.LockOSThread()
uitask = make(chan *uimsg)
initDone <- doWindowsInit()
// go msgloop()
var msg struct {
Hwnd _HWND
Message uint32
WParam _WPARAM
LParam _LPARAM
Time uint32
Pt _POINT
}
var _peekMessage = user32.NewProc("PeekMessageW")
const _PM_REMOVE = 0x0001
for {
select {
case m := <-uitask:
r1, _, err := m.call.Call(m.p...)
m.ret <- uiret{
ret: r1,
err: err,
}
default:
// TODO figure out how to handle errors
_peekMessage.Call(
uintptr(unsafe.Pointer(&msg)),
uintptr(_NULL),
0,
0,
uintptr(_PM_REMOVE))
}
}
}
var (
_dispatchMessage = user32.NewProc("DispatchMessageW")
_getMessage = user32.NewProc("GetMessageW")
_postQuitMessage = user32.NewProc("PostQuitMessage")
_sendMessage = user32.NewProc("SendMessageW")
_translateMessage = user32.NewProc("TranslateMessage")
)
var getMessageFail = -1 // because Go doesn't let me
func msgloop() {
runtime.LockOSThread()
var msg struct {
Hwnd _HWND
Message uint32
WParam _WPARAM
LParam _LPARAM
Time uint32
Pt _POINT
}
for {
r1, _, err := _getMessage.Call(
uintptr(unsafe.Pointer(&msg)),
uintptr(_NULL),
uintptr(0),
uintptr(0))
if r1 == uintptr(getMessageFail) { // failure
panic(fmt.Sprintf("GetMessage failed: %v", err))
} else if r1 == 0 { // quit
break
}
// TODO handle potential errors in TranslateMessage() and DispatchMessage()
_translateMessage.Call(uintptr(unsafe.Pointer(&msg)))
_dispatchMessage.Call(uintptr(unsafe.Pointer(&msg)))
}
}
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