75 lines
1.5 KiB
Go
75 lines
1.5 KiB
Go
|
// 24 march 2014
|
||
|
|
|
||
|
|
package ui
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"syscall"
|
||
|
|
"unsafe"
|
||
|
|
"sync"
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
areastyle = 0 | controlstyle
|
||
|
|
areaxstyle = 0 | controlxstyle
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
areaWndClassFormat = "gouiarea%X"
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
areaWndClassNum uintptr
|
||
|
|
areaWndClassNumLock sync.Mutex
|
||
|
|
)
|
||
|
|
|
||
|
|
func areaWndProc(s *sysData) func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lParam _LPARAM) _LRESULT {
|
||
|
|
return func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lParam _LPARAM) _LRESULT {
|
||
|
|
switch uMsg {
|
||
|
|
default:
|
||
|
|
r1, _, _ := defWindowProc.Call(
|
||
|
|
uintptr(hwnd),
|
||
|
|
uintptr(uMsg),
|
||
|
|
uintptr(wParam),
|
||
|
|
uintptr(lParam))
|
||
|
|
return _LRESULT(r1)
|
||
|
|
}
|
||
|
|
panic(fmt.Sprintf("areaWndProc message %d did not return: internal bug in ui library", uMsg))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func registerAreaWndClass(s *sysData) (newClassName string, err error) {
|
||
|
|
const (
|
||
|
|
// from winuser.h
|
||
|
|
_CS_DBLCLKS = 0x0008
|
||
|
|
)
|
||
|
|
|
||
|
|
areaWndClassNumLock.Lock()
|
||
|
|
newClassName = fmt.Sprintf(areaWndClassFormat, areaWndClassNum)
|
||
|
|
areaWndClassNum++
|
||
|
|
areaWndClassNumLock.Unlock()
|
||
|
|
|
||
|
|
wc := &_WNDCLASS{
|
||
|
|
style: _CS_DBLCLKS, // needed to be able to register double-clicks
|
||
|
|
lpszClassName: uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(newClassName))),
|
||
|
|
lpfnWndProc: syscall.NewCallback(areaWndProc(s)),
|
||
|
|
hInstance: hInstance,
|
||
|
|
hIcon: icon,
|
||
|
|
hCursor: cursor,
|
||
|
|
hbrBackground: _HBRUSH(_COLOR_BTNFACE + 1),
|
||
|
|
}
|
||
|
|
|
||
|
|
ret := make(chan uiret)
|
||
|
|
defer close(ret)
|
||
|
|
uitask <- &uimsg{
|
||
|
|
call: _registerClass,
|
||
|
|
p: []uintptr{uintptr(unsafe.Pointer(wc))},
|
||
|
|
ret: ret,
|
||
|
|
}
|
||
|
|
r := <-ret
|
||
|
|
if r.ret == 0 { // failure
|
||
|
|
return "", r.err
|
||
|
|
}
|
||
|
|
return newClassName, nil
|
||
|
|
}
|