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// 7 february 2014
package ui
import (
"syscall"
"unsafe"
)
var (
user32 = syscall.NewLazyDLL("user32.dll")
kernel32 = syscall.NewLazyDLL("kernel32.dll")
gdi32 = syscall.NewLazyDLL("gdi32.dll")
comctl32 *syscall.LazyDLL // comctl32 not defined here; see comctl_windows.go
msimg32 = syscall.NewLazyDLL("msimg32.dll")
)
type _HANDLE uintptr
type _HWND _HANDLE
type _HBRUSH _HANDLE
type _HMENU _HANDLE
// In MSDN, _LPARAM and _LRESULT are listed as signed pointers, however their interpretation is message-specific. Ergo, just cast them yourself; it'll be the same. (Thanks to Tv` in #go-nuts for helping me realize this.)
type _WPARAM uintptr
type _LPARAM uintptr
type _LRESULT uintptr
func (w _WPARAM) LOWORD() uint16 {
// according to windef.h
return uint16(w & 0xFFFF)
}
func (w _WPARAM) HIWORD() uint16 {
// according to windef.h
return uint16((w >> 16) & 0xFFFF)
}
func _LPARAMFromString(str string) _LPARAM {
return _LPARAM(unsafe.Pointer(syscall.StringToUTF16Ptr(str)))
}
func (l _LPARAM) X() int32 {
// according to windowsx.h
loword := uint16(l & 0xFFFF)
short := int16(loword) // convert to signed...
return int32(short) // ...and sign extend
}
func (l _LPARAM) Y() int32 {
// according to windowsx.h
hiword := uint16((l & 0xFFFF0000) >> 16)
short := int16(hiword) // convert to signed...
return int32(short) // ...and sign extend
}
type _POINT struct {
x int32
y int32
}
type _RECT struct {
left int32
top int32
right int32
bottom int32
}
// Go doesn't allow negative constants to be forced into unsigned types at compile-time; this will do it at runtime.
// TODO make sure sign extension works fine here (check Go's rules and ABI sign extension rules)
func negConst(c int) uintptr {
return uintptr(c)
}
// the next two are convenience wrappers
// the intention is not to say utf16ToArg(toUTF16(s)) - even though it appears to work fine, that's just because the garbage collector is slow; if we store this globally then things will break
// instead, call them separately - s := toUTF16(str); winapifunc.Call(utf16ToArg(s))
func toUTF16(s string) *uint16 {
return syscall.StringToUTF16Ptr(s)
}
func utf16ToArg(s *uint16) uintptr {
return uintptr(unsafe.Pointer(s))
}
var (
_adjustWindowRectEx = user32.NewProc("AdjustWindowRectEx")
_createWindowEx = user32.NewProc("CreateWindowExW")
_getClientRect = user32.NewProc("GetClientRect")
_moveWindow = user32.NewProc("MoveWindow")
_setWindowLong = user32.NewProc("SetWindowLongW")
_setWindowPos = user32.NewProc("SetWindowPos")
_setWindowText = user32.NewProc("SetWindowTextW")
_showWindow = user32.NewProc("ShowWindow")
)
type _MINMAXINFO struct {
ptReserved _POINT
ptMaxSize _POINT
ptMaxPosition _POINT
ptMinTrackSize _POINT
ptMaxTrackSize _POINT
}
func (l _LPARAM) MINMAXINFO() *_MINMAXINFO {
return (*_MINMAXINFO)(unsafe.Pointer(l))
}
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