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Fixed the PeekMessage() call as per http://blogs.msdn.com/b/oldnewthing/archive/2006/02/10/529525.aspx

This commit is contained in:
Pietro Gagliardi 2014-02-11 22:38:46 -05:00
parent 08ba4a1074
commit 6da43e8bb7
1 changed files with 25 additions and 38 deletions
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63
uitask_windows.go
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@ -3,7 +3,6 @@
package main
import (
"fmt"
"syscall"
"unsafe"
"runtime"
@ -28,19 +27,8 @@ func ui(initDone chan error) {
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 {
quit := false
for !quit {
select {
case m := <-uitask:
r1, _, err := m.call.Call(m.p...)
@ -49,20 +37,19 @@ func ui(initDone chan error) {
err: err,
}
default:
// TODO figure out how to handle errors
_peekMessage.Call(
uintptr(unsafe.Pointer(&msg)),
uintptr(_NULL),
0,
0,
uintptr(_PM_REMOVE))
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")
@ -70,9 +57,7 @@ var (
var getMessageFail = -1 // because Go doesn't let me
func msgloop() {
runtime.LockOSThread()
func msgloopstep() (quit bool) {
var msg struct {
Hwnd _HWND
Message uint32
@ -82,19 +67,21 @@ func msgloop() {
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)))
// 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
}