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// SPDX-License-Identifier: Unlicense OR MIT
package window
import (
"errors"
"fmt"
"image"
"reflect"
"runtime"
"sort"
"strings"
"sync"
"time"
"unicode"
"unicode/utf16"
"unsafe"
syscall "golang.org/x/sys/windows"
"gioui.org/app/internal/windows"
"gioui.org/unit"
"gioui.org/f32"
"gioui.org/io/key"
"gioui.org/io/pointer"
"gioui.org/io/system"
)
type winConstraints struct {
minWidth, minHeight int32
maxWidth, maxHeight int32
}
type winDeltas struct {
width int32
height int32
}
type window struct {
hwnd syscall.Handle
hdc syscall.Handle
w Callbacks
width int
height int
stage system.Stage
dead bool
pointerBtns pointer.Buttons
mu sync.Mutex
animating bool
minmax winConstraints
deltas winDeltas
opts *Options
}
const _WM_REDRAW = windows.WM_USER + 0
type gpuAPI struct {
priority int
initializer func(w *window) (Context, error)
}
// backends is the list of potential Context
// implementations.
var backends []gpuAPI
// winMap maps win32 HWNDs to *windows.
var winMap sync.Map
var resources struct {
once sync.Once
// handle is the module handle from GetModuleHandle.
handle syscall.Handle
// class is the Gio window class from RegisterClassEx.
class uint16
// cursor is the arrow cursor resource
cursor syscall.Handle
}
func Main() {
select {}
}
func NewWindow(window Callbacks, opts *Options) error {
cerr := make(chan error)
go func() {
// Call win32 API from a single OS thread.
runtime.LockOSThread()
w, err := createNativeWindow(opts)
if err != nil {
cerr <- err
return
}
defer w.destroy()
cerr <- nil
winMap.Store(w.hwnd, w)
defer winMap.Delete(w.hwnd)
w.w = window
w.w.SetDriver(w)
defer w.w.Event(system.DestroyEvent{})
windows.ShowWindow(w.hwnd, windows.SW_SHOWDEFAULT)
windows.SetForegroundWindow(w.hwnd)
windows.SetFocus(w.hwnd)
if err := w.loop(); err != nil {
panic(err)
}
}()
return <-cerr
}
// initResources initializes the resources global.
func initResources() error {
windows.SetProcessDPIAware()
hInst, err := windows.GetModuleHandle()
if err != nil {
return err
}
resources.handle = hInst
curs, err := windows.LoadCursor(windows.IDC_ARROW)
if err != nil {
return err
}
resources.cursor = curs
wcls := windows.WndClassEx{
CbSize: uint32(unsafe.Sizeof(windows.WndClassEx{})),
Style: windows.CS_HREDRAW | windows.CS_VREDRAW | windows.CS_OWNDC,
LpfnWndProc: syscall.NewCallback(windowProc),
HInstance: hInst,
HCursor: curs,
LpszClassName: syscall.StringToUTF16Ptr("GioWindow"),
}
cls, err := windows.RegisterClassEx(&wcls)
if err != nil {
return err
}
resources.class = cls
return nil
}
func getWindowConstraints(cfg unit.Metric, opts *Options, d winDeltas) winConstraints {
var minmax winConstraints
minmax.minWidth = int32(cfg.Px(opts.MinWidth))
minmax.minHeight = int32(cfg.Px(opts.MinHeight))
minmax.maxWidth = int32(cfg.Px(opts.MaxWidth))
minmax.maxHeight = int32(cfg.Px(opts.MaxHeight))
return minmax
}
func createNativeWindow(opts *Options) (*window, error) {
var resErr error
resources.once.Do(func() {
resErr = initResources()
})
if resErr != nil {
return nil, resErr
}
cfg := configForDC()
wr := windows.Rect{
Right: int32(cfg.Px(opts.Width)),
Bottom: int32(cfg.Px(opts.Height)),
}
dwStyle := uint32(windows.WS_OVERLAPPEDWINDOW)
dwExStyle := uint32(windows.WS_EX_APPWINDOW | windows.WS_EX_WINDOWEDGE)
deltas := winDeltas{
width: wr.Right,
height: wr.Bottom,
}
windows.AdjustWindowRectEx(&wr, dwStyle, 0, dwExStyle)
deltas.width = wr.Right - wr.Left - deltas.width
deltas.height = wr.Bottom - wr.Top - deltas.height
hwnd, err := windows.CreateWindowEx(dwExStyle,
resources.class,
opts.Title,
dwStyle|windows.WS_CLIPSIBLINGS|windows.WS_CLIPCHILDREN,
windows.CW_USEDEFAULT, windows.CW_USEDEFAULT,
wr.Right-wr.Left,
wr.Bottom-wr.Top,
0,
0,
resources.handle,
0)
if err != nil {
return nil, err
}
w := &window{
hwnd: hwnd,
minmax: getWindowConstraints(cfg, opts, deltas),
deltas: deltas,
opts: opts,
}
w.hdc, err = windows.GetDC(hwnd)
if err != nil {
return nil, err
}
return w, nil
}
func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr {
win, exists := winMap.Load(hwnd)
if !exists {
return windows.DefWindowProc(hwnd, msg, wParam, lParam)
}
w := win.(*window)
switch msg {
case windows.WM_UNICHAR:
if wParam == windows.UNICODE_NOCHAR {
// Tell the system that we accept WM_UNICHAR messages.
return 1
}
fallthrough
case windows.WM_CHAR:
if r := rune(wParam); unicode.IsPrint(r) {
w.w.Event(key.EditEvent{Text: string(r)})
}
// The message is processed.
return 1
case windows.WM_DPICHANGED:
// Let Windows know we're prepared for runtime DPI changes.
return 1
case windows.WM_ERASEBKGND:
// Avoid flickering between GPU content and background color.
return 1
case windows.WM_KEYDOWN, windows.WM_SYSKEYDOWN:
if n, ok := convertKeyCode(wParam); ok {
w.w.Event(key.Event{Name: n, Modifiers: getModifiers()})
}
case windows.WM_LBUTTONDOWN:
w.pointerButton(pointer.ButtonLeft, true, lParam, getModifiers())
case windows.WM_LBUTTONUP:
w.pointerButton(pointer.ButtonLeft, false, lParam, getModifiers())
case windows.WM_RBUTTONDOWN:
w.pointerButton(pointer.ButtonRight, true, lParam, getModifiers())
case windows.WM_RBUTTONUP:
w.pointerButton(pointer.ButtonRight, false, lParam, getModifiers())
case windows.WM_MBUTTONDOWN:
w.pointerButton(pointer.ButtonMiddle, true, lParam, getModifiers())
case windows.WM_MBUTTONUP:
w.pointerButton(pointer.ButtonMiddle, false, lParam, getModifiers())
case windows.WM_CANCELMODE:
w.w.Event(pointer.Event{
Type: pointer.Cancel,
})
case windows.WM_SETFOCUS:
w.w.Event(key.FocusEvent{Focus: true})
case windows.WM_KILLFOCUS:
w.w.Event(key.FocusEvent{Focus: false})
case windows.WM_MOUSEMOVE:
x, y := coordsFromlParam(lParam)
p := f32.Point{X: float32(x), Y: float32(y)}
w.w.Event(pointer.Event{
Type: pointer.Move,
Source: pointer.Mouse,
Position: p,
Buttons: w.pointerBtns,
Time: windows.GetMessageTime(),
})
case windows.WM_MOUSEWHEEL:
w.scrollEvent(wParam, lParam)
case windows.WM_DESTROY:
w.dead = true
case windows.WM_PAINT:
w.draw(true)
case windows.WM_SIZE:
switch wParam {
case windows.SIZE_MINIMIZED:
w.setStage(system.StagePaused)
case windows.SIZE_MAXIMIZED, windows.SIZE_RESTORED:
w.setStage(system.StageRunning)
}
case windows.WM_GETMINMAXINFO:
mm := (*windows.MinMaxInfo)(unsafe.Pointer(uintptr(lParam)))
if w.minmax.minWidth > 0 || w.minmax.minHeight > 0 {
mm.PtMinTrackSize = windows.Point{
w.minmax.minWidth+w.deltas.width,
w.minmax.minHeight+w.deltas.height,
}
}
if w.minmax.maxWidth > 0 || w.minmax.maxHeight > 0 {
mm.PtMaxTrackSize = windows.Point{
w.minmax.maxWidth+w.deltas.width,
w.minmax.maxHeight+w.deltas.height,
}
}
}
return windows.DefWindowProc(hwnd, msg, wParam, lParam)
}
func getModifiers() key.Modifiers {
var kmods key.Modifiers
if windows.GetKeyState(windows.VK_LWIN)&0x1000 != 0 || windows.GetKeyState(windows.VK_RWIN)&0x1000 != 0 {
kmods |= key.ModSuper
}
if windows.GetKeyState(windows.VK_MENU)&0x1000 != 0 {
kmods |= key.ModAlt
}
if windows.GetKeyState(windows.VK_CONTROL)&0x1000 != 0 {
kmods |= key.ModCtrl
}
if windows.GetKeyState(windows.VK_SHIFT)&0x1000 != 0 {
kmods |= key.ModShift
}
return kmods
}
func (w *window) pointerButton(btn pointer.Buttons, press bool, lParam uintptr, kmods key.Modifiers) {
var typ pointer.Type
if press {
typ = pointer.Press
if w.pointerBtns == 0 {
windows.SetCapture(w.hwnd)
}
w.pointerBtns |= btn
} else {
typ = pointer.Release
w.pointerBtns &^= btn
if w.pointerBtns == 0 {
windows.ReleaseCapture()
}
}
x, y := coordsFromlParam(lParam)
p := f32.Point{X: float32(x), Y: float32(y)}
w.w.Event(pointer.Event{
Type: typ,
Source: pointer.Mouse,
Position: p,
Buttons: w.pointerBtns,
Time: windows.GetMessageTime(),
Modifiers: kmods,
})
}
func coordsFromlParam(lParam uintptr) (int, int) {
x := int(int16(lParam & 0xffff))
y := int(int16((lParam >> 16) & 0xffff))
return x, y
}
func (w *window) scrollEvent(wParam, lParam uintptr) {
x, y := coordsFromlParam(lParam)
// The WM_MOUSEWHEEL coordinates are in screen coordinates, in contrast
// to other mouse events.
np := windows.Point{X: int32(x), Y: int32(y)}
windows.ScreenToClient(w.hwnd, &np)
p := f32.Point{X: float32(np.X), Y: float32(np.Y)}
dist := float32(int16(wParam >> 16))
w.w.Event(pointer.Event{
Type: pointer.Scroll,
Source: pointer.Mouse,
Position: p,
Buttons: w.pointerBtns,
Scroll: f32.Point{Y: -dist},
Time: windows.GetMessageTime(),
})
}
// Adapted from https://blogs.msdn.microsoft.com/oldnewthing/20060126-00/?p=32513/
func (w *window) loop() error {
msg := new(windows.Msg)
for !w.dead {
w.mu.Lock()
anim := w.animating
w.mu.Unlock()
if anim && !windows.PeekMessage(msg, w.hwnd, 0, 0, windows.PM_NOREMOVE) {
w.draw(false)
continue
}
windows.GetMessage(msg, w.hwnd, 0, 0)
if msg.Message == windows.WM_QUIT {
windows.PostQuitMessage(msg.WParam)
break
}
windows.TranslateMessage(msg)
windows.DispatchMessage(msg)
}
return nil
}
func (w *window) SetAnimating(anim bool) {
w.mu.Lock()
w.animating = anim
w.mu.Unlock()
if anim {
w.postRedraw()
}
}
func (w *window) postRedraw() {
if err := windows.PostMessage(w.hwnd, _WM_REDRAW, 0, 0); err != nil {
panic(err)
}
}
func (w *window) setStage(s system.Stage) {
w.stage = s
w.w.Event(system.StageEvent{Stage: s})
}
func (w *window) draw(sync bool) {
var r windows.Rect
windows.GetClientRect(w.hwnd, &r)
w.width = int(r.Right - r.Left)
w.height = int(r.Bottom - r.Top)
if w.width == 0 || w.height == 0 {
return
}
cfg := configForDC()
w.minmax = getWindowConstraints(cfg, w.opts, w.deltas)
w.w.Event(FrameEvent{
FrameEvent: system.FrameEvent{
Now: time.Now(),
Size: image.Point{
X: w.width,
Y: w.height,
},
Metric: cfg,
},
Sync: sync,
})
}
func (w *window) destroy() {
if w.hdc != 0 {
windows.ReleaseDC(w.hdc)
w.hdc = 0
}
if w.hwnd != 0 {
windows.DestroyWindow(w.hwnd)
w.hwnd = 0
}
}
func (w *window) NewContext() (Context, error) {
sort.Slice(backends, func(i, j int) bool {
return backends[i].priority < backends[j].priority
})
var errs []string
for _, b := range backends {
ctx, err := b.initializer(w)
if err == nil {
return ctx, nil
}
errs = append(errs, err.Error())
}
if len(errs) > 0 {
return nil, fmt.Errorf("NewContext: failed to create a GPU device, tried: %s", strings.Join(errs, ", "))
}
return nil, errors.New("NewContext: no available backends")
}
func (w *window) ReadClipboard() {
w.readClipboard()
}
func (w *window) readClipboard() error {
if err := windows.OpenClipboard(w.hwnd); err != nil {
return err
}
defer windows.CloseClipboard()
mem, err := windows.GetClipboardData(windows.CF_UNICODETEXT)
if err != nil {
return err
}
ptr, err := windows.GlobalLock(mem)
if err != nil {
return err
}
defer windows.GlobalUnlock(mem)
// Look for terminating null character.
n := 0
for {
ch := *(*uint16)(unsafe.Pointer(ptr + uintptr(n)*2))
if ch == 0 {
break
}
n++
}
var u16 []uint16
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&u16))
hdr.Data = ptr
hdr.Cap = n
hdr.Len = n
content := string(utf16.Decode(u16))
go func() {
w.w.Event(system.ClipboardEvent{Text: content})
}()
return nil
}
func (w *window) WriteClipboard(s string) {
w.writeClipboard(s)
}
func (w *window) writeClipboard(s string) error {
u16 := utf16.Encode([]rune(s))
// Data must be null terminated.
u16 = append(u16, 0)
if err := windows.OpenClipboard(w.hwnd); err != nil {
return err
}
defer windows.CloseClipboard()
if err := windows.EmptyClipboard(); err != nil {
return err
}
n := len(u16) * int(unsafe.Sizeof(u16[0]))
mem, err := windows.GlobalAlloc(n)
if err != nil {
return err
}
ptr, err := windows.GlobalLock(mem)
if err != nil {
windows.GlobalFree(mem)
return err
}
var u16v []uint16
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&u16v))
hdr.Data = ptr
hdr.Cap = len(u16)
hdr.Len = len(u16)
copy(u16v, u16)
windows.GlobalUnlock(mem)
if err := windows.SetClipboardData(windows.CF_UNICODETEXT, mem); err != nil {
windows.GlobalFree(mem)
return err
}
return nil
}
func (w *window) ShowTextInput(show bool) {}
func (w *window) HDC() syscall.Handle {
return w.hdc
}
func (w *window) HWND() (syscall.Handle, int, int) {
return w.hwnd, w.width, w.height
}
func (w *window) Close() {
windows.PostMessage(w.hwnd, windows.WM_CLOSE, 0, 0)
}
func convertKeyCode(code uintptr) (string, bool) {
if '0' <= code && code <= '9' || 'A' <= code && code <= 'Z' {
return string(rune(code)), true
}
var r string
switch code {
case windows.VK_ESCAPE:
r = key.NameEscape
case windows.VK_LEFT:
r = key.NameLeftArrow
case windows.VK_RIGHT:
r = key.NameRightArrow
case windows.VK_RETURN:
r = key.NameReturn
case windows.VK_UP:
r = key.NameUpArrow
case windows.VK_DOWN:
r = key.NameDownArrow
case windows.VK_HOME:
r = key.NameHome
case windows.VK_END:
r = key.NameEnd
case windows.VK_BACK:
r = key.NameDeleteBackward
case windows.VK_DELETE:
r = key.NameDeleteForward
case windows.VK_PRIOR:
r = key.NamePageUp
case windows.VK_NEXT:
r = key.NamePageDown
case windows.VK_F1:
r = "F1"
case windows.VK_F2:
r = "F2"
case windows.VK_F3:
r = "F3"
case windows.VK_F4:
r = "F4"
case windows.VK_F5:
r = "F5"
case windows.VK_F6:
r = "F6"
case windows.VK_F7:
r = "F7"
case windows.VK_F8:
r = "F8"
case windows.VK_F9:
r = "F9"
case windows.VK_F10:
r = "F10"
case windows.VK_F11:
r = "F11"
case windows.VK_F12:
r = "F12"
case windows.VK_TAB:
r = key.NameTab
case windows.VK_SPACE:
r = "Space"
case windows.VK_OEM_1:
r = ";"
case windows.VK_OEM_PLUS:
r = "+"
case windows.VK_OEM_COMMA:
r = ","
case windows.VK_OEM_MINUS:
r = "-"
case windows.VK_OEM_PERIOD:
r = "."
case windows.VK_OEM_2:
r = "/"
case windows.VK_OEM_3:
r = "`"
case windows.VK_OEM_4:
r = "["
case windows.VK_OEM_5, windows.VK_OEM_102:
r = "\\"
case windows.VK_OEM_6:
r = "]"
case windows.VK_OEM_7:
r = "'"
default:
return "", false
}
return r, true
}
func configForDC() unit.Metric {
dpi := windows.GetSystemDPI()
const inchPrDp = 1.0 / 96.0
ppdp := float32(dpi) * inchPrDp
return unit.Metric{
PxPerDp: ppdp,
PxPerSp: ppdp,
}
}
|