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// 11 february 2014
//package ui
package main
import (
"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()
quit := false
for !quit {
select {
case m := <-uitask:
r1, _, err := m.call.Call(m.p...)
m.ret <- uiret{
ret: r1,
err: err,
}
default:
quit = msgloopstep()
}
}
}
const (
_PM_REMOVE = 0x0001
)
var (
_dispatchMessage = user32.NewProc("DispatchMessageW")
_getMessage = user32.NewProc("GetMessageW")
_peekMessage = user32.NewProc("PeekMessageW")
_postQuitMessage = user32.NewProc("PostQuitMessage")
_sendMessage = user32.NewProc("SendMessageW")
_translateMessage = user32.NewProc("TranslateMessage")
)
var getMessageFail = -1 // because Go doesn't let me
func msgloopstep() (quit bool) {
var msg struct {
Hwnd _HWND
Message uint32
WParam _WPARAM
LParam _LPARAM
Time uint32
Pt _POINT
}
// TODO figure out how to handle errors
r1, _, _ := _peekMessage.Call(
uintptr(unsafe.Pointer(&msg)),
uintptr(_NULL),
uintptr(0),
uintptr(0),
uintptr(_PM_REMOVE))
if r1 == 0 { // no message available
return false
}
if msg.Message == _WM_QUIT {
return true
}
// TODO handle potential errors in TranslateMessage() and DispatchMessage()
_translateMessage.Call(uintptr(unsafe.Pointer(&msg)))
_dispatchMessage.Call(uintptr(unsafe.Pointer(&msg)))
return false
}
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