107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
// 7 february 2014
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package ui
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import (
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"syscall"
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"unsafe"
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)
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var (
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user32 = syscall.NewLazyDLL("user32.dll")
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kernel32 = syscall.NewLazyDLL("kernel32.dll")
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gdi32 = syscall.NewLazyDLL("gdi32.dll")
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comctl32 *syscall.LazyDLL // comctl32 not defined here; see comctl_windows.go
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msimg32 = syscall.NewLazyDLL("msimg32.dll")
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)
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type _HANDLE uintptr
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type _HWND _HANDLE
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type _HBRUSH _HANDLE
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type _HMENU _HANDLE
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// 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.)
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type _WPARAM uintptr
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type _LPARAM uintptr
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type _LRESULT uintptr
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func (w _WPARAM) LOWORD() uint16 {
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// according to windef.h
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return uint16(w & 0xFFFF)
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}
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func (w _WPARAM) HIWORD() uint16 {
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// according to windef.h
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return uint16((w >> 16) & 0xFFFF)
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}
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func (l _LPARAM) X() int32 {
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// according to windowsx.h
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loword := uint16(l & 0xFFFF)
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short := int16(loword) // convert to signed...
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return int32(short) // ...and sign extend
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}
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func (l _LPARAM) Y() int32 {
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// according to windowsx.h
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hiword := uint16((l & 0xFFFF0000) >> 16)
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short := int16(hiword) // convert to signed...
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return int32(short) // ...and sign extend
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}
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type _POINT struct {
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x int32
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y int32
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}
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type _RECT struct {
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left int32
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top int32
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right int32
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bottom int32
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}
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// Go doesn't allow negative constants to be forced into unsigned types at compile-time; this will do it at runtime.
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// This is safe; see http://stackoverflow.com/questions/24022225/what-are-the-sign-extension-rules-for-calling-windows-api-functions-stdcall-t
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func negConst(c int) uintptr {
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return uintptr(c)
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}
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// the next two are convenience wrappers
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// the intention is not to say utf16ToArg(toUTF16(s)) - even though it appears to work fine, that's just because the garbage collector scheduling makes it run long after we're finished; if we store these uintptrs globally instead, then things will break
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// instead, call them separately - s := toUTF16(str); winapifunc.Call(utf16ToArg(s))
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func toUTF16(s string) *uint16 {
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return syscall.StringToUTF16Ptr(s)
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}
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func utf16ToArg(s *uint16) uintptr {
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return uintptr(unsafe.Pointer(s))
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}
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func utf16ToLPARAM(s *uint16) uintptr {
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return uintptr(_LPARAM(unsafe.Pointer(s)))
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}
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var (
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_adjustWindowRectEx = user32.NewProc("AdjustWindowRectEx")
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_createWindowEx = user32.NewProc("CreateWindowExW")
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_getClientRect = user32.NewProc("GetClientRect")
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_moveWindow = user32.NewProc("MoveWindow")
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_setWindowPos = user32.NewProc("SetWindowPos")
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_setWindowText = user32.NewProc("SetWindowTextW")
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_showWindow = user32.NewProc("ShowWindow")
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)
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type _MINMAXINFO struct {
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ptReserved _POINT
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ptMaxSize _POINT
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ptMaxPosition _POINT
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ptMinTrackSize _POINT
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ptMaxTrackSize _POINT
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}
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func (l _LPARAM) MINMAXINFO() *_MINMAXINFO {
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return (*_MINMAXINFO)(unsafe.Pointer(l))
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}
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