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#271 Trying out syscall.SyscallN on windows
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@BrentFarris
BrentFarris committed Jun 8, 2024
1 parent 61f333b commit 0936e40
Showing 1 changed file with 102 additions and 21 deletions.
123 changes: 102 additions & 21 deletions src/windowing/window.win32.go
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Original file line number Diff line number Diff line change
Expand Up @@ -40,31 +40,67 @@
package windowing

import (
"syscall"
"unicode/utf16"
"unsafe"

"golang.design/x/clipboard"
"golang.org/x/sys/windows"
)

/*
#cgo LDFLAGS: -lgdi32 -lXInput
#cgo noescape window_main
#cgo noescape window_show
//#cgo noescape window_show
#cgo noescape window_destroy
#cgo noescape window_cursor_standard
#cgo noescape window_cursor_ibeam
#cgo noescape window_dpi
#cgo noescape window_focus
#cgo noescape window_position
#cgo noescape window_set_position
#cgo noescape window_set_size
#cgo noescape window_remove_border
#cgo noescape window_add_border
//#cgo noescape window_cursor_standard
//#cgo noescape window_cursor_ibeam
//#cgo noescape window_dpi
//#cgo noescape window_focus
//#cgo noescape window_position
//#cgo noescape window_set_position
//#cgo noescape window_set_size
//#cgo noescape window_remove_border
//#cgo noescape window_add_border
#include "windowing.h"
*/
import "C"

var (
user32 = windows.NewLazySystemDLL("user32.dll")
procShowWindow = user32.NewProc("ShowWindow")
procPostMessageA = user32.NewProc("PostMessageA")
procGetDpiForWindow = user32.NewProc("GetDpiForWindow")
procBringWindowToTop = user32.NewProc("BringWindowToTop")
procSetFocus = user32.NewProc("SetFocus")
procGetWindowPlacement = user32.NewProc("GetWindowPlacement")
procSetWindowPos = user32.NewProc("SetWindowPos")
procGetWindowLongW = user32.NewProc("GetWindowLongW")
procSetWindowLongW = user32.NewProc("SetWindowLongW")
)

type POINT struct {
X int32
Y int32
}

type RECT struct {
Left int32
Top int32
Right int32
Bottom int32
}

type WINDOWPLACEMENT struct {
Length uint32
Flags uint32
ShowCmd uint32
PtMinPosition POINT
PtMaxPosition POINT
RcNormalPosition RECT
}

func asEventType(msg uint32) eventType {
switch msg {
case 0x0002:
Expand Down Expand Up @@ -126,7 +162,8 @@ func createWindow(windowName string, width, height, x, y int, evtSharedMem *evtM
}

func (w *Window) showWindow(evtSharedMem *evtMem) {
C.window_show(w.handle)
syscall.SyscallN(procShowWindow.Addr(), uintptr(w.handle), 5 /*SW_SHOW*/)
//C.window_show(w.handle)
}

func (w *Window) destroy() {
Expand Down Expand Up @@ -159,11 +196,15 @@ func (w *Window) poll() {
}

func (w *Window) cursorStandard() {
C.window_cursor_standard(w.handle)
syscall.SyscallN(procPostMessageA.Addr(), uintptr(w.handle),
0x0400+0x0001 /*UWM_SET_CURSOR*/, 1 /*CURSOR_ARROW*/, 0)
//C.window_cursor_standard(w.handle)
}

func (w *Window) cursorIbeam() {
C.window_cursor_ibeam(w.handle)
syscall.SyscallN(procPostMessageA.Addr(), uintptr(w.handle),
0x0400+0x0001 /*UWM_SET_CURSOR*/, 2 /*CURSOR_IBEAM*/, 0)
//C.window_cursor_ibeam(w.handle)
}

func (w *Window) cursorSizeAll() {
Expand All @@ -187,7 +228,9 @@ func (w *Window) clipboardContents() string {
}

func (w *Window) sizeMM() (int, int, error) {
dpi := float64(C.window_dpi(w.handle))
r1, _, _ := syscall.SyscallN(procGetDpiForWindow.Addr(), uintptr(w.handle))
dpi := float64(r1)
//dpi := float64(C.window_dpi(w.handle))
mm := dpi / 25.4
return int(float64(w.width) * mm), int(float64(w.height) * mm), nil
}
Expand All @@ -196,26 +239,64 @@ func (w *Window) cHandle() unsafe.Pointer { return w.handle }
func (w *Window) cInstance() unsafe.Pointer { return w.instance }

func (w *Window) focus() {
C.window_focus(w.handle)
syscall.SyscallN(procBringWindowToTop.Addr(), uintptr(w.handle))
syscall.SyscallN(procSetFocus.Addr(), uintptr(w.handle))
//C.window_focus(w.handle)
}

func (w *Window) position() (x, y int) {
C.window_position(w.handle, (*C.int)(unsafe.Pointer(&x)), (*C.int)(unsafe.Pointer(&y)))
return x, y
wp := WINDOWPLACEMENT{}
wp.Length = uint32(unsafe.Sizeof(wp))
r1, _, _ := syscall.SyscallN(procGetWindowPlacement.Addr(),
uintptr(w.handle), uintptr(unsafe.Pointer(&wp)))
if r1 == 0 {
return 0, 0
}
return int(wp.RcNormalPosition.Left), int(wp.RcNormalPosition.Top)
//C.window_position(w.handle, (*C.int)(unsafe.Pointer(&x)), (*C.int)(unsafe.Pointer(&y)))
//return x, y
}

func (w *Window) setPosition(x, y int) {
C.window_set_position(w.handle, C.int(x), C.int(y))
syscall.SyscallN(procSetWindowPos.Addr(), uintptr(w.handle),
0, uintptr(unsafe.Pointer(&x)), uintptr(unsafe.Pointer(&y)),
0, 0, 0x0001|0x0004 /*SWP_NOSIZE|SWP_NOZORDER*/)
//C.window_set_position(w.handle, C.int(x), C.int(y))
}

func (w *Window) setSize(width, height int) {
C.window_set_size(w.handle, C.int(width), C.int(height))
syscall.SyscallN(procSetWindowPos.Addr(), uintptr(w.handle),
0, 0, 0, uintptr(unsafe.Pointer(&width)),
uintptr(unsafe.Pointer(&height)), 0x0002|0x0004 /*SWP_NOMOVE|SWP_NOZORDER*/)
//C.window_set_size(w.handle, C.int(width), C.int(height))
}

func (w *Window) removeBorder() {
C.window_remove_border(w.handle)
gwlStyle := -16 /*GWL_STYLE*/
r1, _, _ := syscall.SyscallN(procGetWindowLongW.Addr(),
uintptr(w.handle), uintptr(gwlStyle))
style := int32(r1)
style &= ^0x00C00000 /*WS_CAPTION*/
style &= ^0x00040000 /*WS_THICKFRAME*/
style &= ^0x00020000 /*WS_MINIMIZEBOX*/
style &= ^0x00010000 /*WS_MAXIMIZEBOX*/
style &= ^0x00080000 /*WS_SYSMENU*/
syscall.SyscallN(procSetWindowLongW.Addr(),
uintptr(w.handle), uintptr(gwlStyle), uintptr(style))
//C.window_remove_border(w.handle)
}

func (w *Window) addBorder() {
C.window_add_border(w.handle)
gwlStyle := -16 /*GWL_STYLE*/
r1, _, _ := syscall.SyscallN(procGetWindowLongW.Addr(),
uintptr(w.handle), uintptr(gwlStyle))
style := int32(r1)
style |= 0x00C00000 /*WS_CAPTION*/
style |= 0x00040000 /*WS_THICKFRAME*/
style |= 0x00020000 /*WS_MINIMIZEBOX*/
style |= 0x00010000 /*WS_MAXIMIZEBOX*/
style |= 0x00080000 /*WS_SYSMENU*/
syscall.SyscallN(procSetWindowLongW.Addr(),
uintptr(w.handle), uintptr(gwlStyle), uintptr(style))
//C.window_add_border(w.handle)
}

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