mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-15 07:27:32 +01:00
314 lines
7.2 KiB
Go
314 lines
7.2 KiB
Go
// Copyright 2024 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package textinput
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import (
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"sync"
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"unsafe"
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"golang.org/x/sys/windows"
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"github.com/hajimehoshi/ebiten/v2/internal/microsoftgdk"
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"github.com/hajimehoshi/ebiten/v2/internal/ui"
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)
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type textInput struct {
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session *session
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origWndProc uintptr
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wndProcCallback uintptr
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window windows.HWND
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immContext uintptr
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highSurrogate uint16
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initOnce sync.Once
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err error
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}
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var theTextInput textInput
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func (t *textInput) Start(x, y int) (chan State, func()) {
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if microsoftgdk.IsXbox() {
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return nil, nil
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}
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var session *session
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var err error
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ui.Get().RunOnMainThread(func() {
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t.end()
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err = t.start(x, y)
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session = newSession()
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t.session = session
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})
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if err != nil {
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session.ch <- State{Error: err}
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session.end()
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}
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return session.ch, func() {
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ui.Get().RunOnMainThread(func() {
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// Disable IME again.
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if t.immContext != 0 {
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return
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}
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c, err := _ImmAssociateContext(t.window, 0)
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if err != nil {
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t.err = err
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return
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}
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t.immContext = c
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t.end()
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})
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}
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}
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// start must be called from the main thread.
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func (t *textInput) start(x, y int) error {
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if t.err != nil {
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return t.err
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}
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if t.window == 0 {
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t.window = _GetActiveWindow()
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}
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if t.origWndProc == 0 {
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if t.wndProcCallback == 0 {
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t.wndProcCallback = windows.NewCallback(t.wndProc)
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}
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// Note that a Win32API GetActiveWindow doesn't work on Xbox.
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h, err := _SetWindowLongPtrW(t.window, _GWL_WNDPROC, t.wndProcCallback)
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if err != nil {
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return err
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}
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t.origWndProc = h
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}
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// By default, IME was disabled by setting 0 as the IMM context.
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// Restore the context once.
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var err error
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t.initOnce.Do(func() {
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err = ui.Get().RestoreIMMContextOnMainThread()
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})
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if err != nil {
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return err
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}
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if t.immContext != 0 {
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if _, err := _ImmAssociateContext(t.window, t.immContext); err != nil {
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return err
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}
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t.immContext = 0
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}
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h := _ImmGetContext(t.window)
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if err := _ImmSetCandidateWindow(h, &_CANDIDATEFORM{
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dwIndex: 0,
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dwStyle: _CFS_CANDIDATEPOS,
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ptCurrentPos: _POINT{
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x: int32(x),
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y: int32(y),
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},
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}); err != nil {
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return err
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}
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if err := _ImmReleaseContext(t.window, h); err != nil {
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return err
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}
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return nil
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}
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func (t *textInput) wndProc(hWnd uintptr, uMsg uint32, wParam, lParam uintptr) uintptr {
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if t.session == nil {
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return _CallWindowProcW(t.origWndProc, hWnd, uMsg, wParam, lParam)
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}
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switch uMsg {
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case _WM_IME_SETCONTEXT:
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// Draw preedit text by an application side.
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if lParam&_ISC_SHOWUICOMPOSITIONWINDOW != 0 {
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lParam &^= _ISC_SHOWUICOMPOSITIONWINDOW
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}
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case _WM_IME_COMPOSITION:
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if lParam&(_GCS_RESULTSTR|_GCS_COMPSTR) != 0 {
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if lParam&_GCS_RESULTSTR != 0 {
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if err := t.commit(); err != nil {
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t.session.ch <- State{Error: err}
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t.end()
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}
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}
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if lParam&_GCS_COMPSTR != 0 {
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if err := t.update(); err != nil {
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t.session.ch <- State{Error: err}
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t.end()
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}
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}
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return 1
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}
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case _WM_CHAR, _WM_SYSCHAR:
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if wParam >= 0xd800 && wParam <= 0xdbff {
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t.highSurrogate = uint16(wParam)
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} else {
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var c rune
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if wParam >= 0xdc00 && wParam <= 0xdfff {
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if t.highSurrogate != 0 {
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c += (rune(t.highSurrogate) - 0xd800) << 10
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c += (rune(wParam) & 0xffff) - 0xdc00
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c += 0x10000
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}
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} else {
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c = rune(wParam) & 0xffff
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}
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t.highSurrogate = 0
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if c >= 0x20 {
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str := string(c)
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t.send(str, 0, len(str), true)
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}
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}
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case _WM_UNICHAR:
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if wParam == _UNICODE_NOCHAR {
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// WM_UNICHAR is not sent by Windows, but is sent by some third-party input method engine.
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// Returning TRUE here announces support for this message.
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return 1
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}
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if r := rune(wParam); r >= 0x20 {
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str := string(r)
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t.send(str, 0, len(str), true)
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}
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}
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return _CallWindowProcW(t.origWndProc, hWnd, uMsg, wParam, lParam)
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}
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// send must be called from the main thread.
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func (t *textInput) send(text string, startInBytes, endInBytes int, committed bool) {
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if t.session != nil {
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t.session.trySend(State{
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Text: text,
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CompositionSelectionStartInBytes: startInBytes,
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CompositionSelectionEndInBytes: endInBytes,
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Committed: committed,
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})
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}
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if committed {
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t.end()
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}
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}
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// end must be called from the main thread.
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func (t *textInput) end() {
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if t.session == nil {
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return
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}
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t.session.end()
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t.session = nil
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}
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// update must be called from the main thread.
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func (t *textInput) update() (ferr error) {
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if t.err != nil {
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return t.err
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}
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hIMC := _ImmGetContext(t.window)
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defer func() {
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if err := _ImmReleaseContext(t.window, hIMC); err != nil && ferr != nil {
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ferr = err
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}
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}()
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bufferLen, err := _ImmGetCompositionStringW(hIMC, _GCS_COMPSTR, nil, 0)
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if err != nil {
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return err
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}
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if bufferLen == 0 {
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return nil
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}
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buffer16 := make([]uint16, bufferLen/uint32(unsafe.Sizeof(uint16(0))))
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if _, err := _ImmGetCompositionStringW(hIMC, _GCS_COMPSTR, unsafe.Pointer(&buffer16[0]), bufferLen); err != nil {
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return err
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}
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attrLen, err := _ImmGetCompositionStringW(hIMC, _GCS_COMPATTR, nil, 0)
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if err != nil {
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return err
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}
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attr := make([]byte, attrLen)
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if _, err := _ImmGetCompositionStringW(hIMC, _GCS_COMPATTR, unsafe.Pointer(&attr[0]), attrLen); err != nil {
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return err
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}
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clauseLen, err := _ImmGetCompositionStringW(hIMC, _GCS_COMPCLAUSE, nil, 0)
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if err != nil {
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return err
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}
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clause := make([]uint32, clauseLen/uint32(unsafe.Sizeof(uint32(0))))
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if _, err := _ImmGetCompositionStringW(hIMC, _GCS_COMPCLAUSE, unsafe.Pointer(&clause[0]), clauseLen); err != nil {
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return err
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}
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var start16 int
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var end16 int
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if len(clause) > 0 {
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for i, c := range clause[:len(clause)-1] {
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if int(c) == len(attr) {
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break
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}
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if attr[c] == _ATTR_TARGET_CONVERTED || attr[c] == _ATTR_TARGET_NOTCONVERTED {
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start16 = int(c)
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end16 = int(clause[i+1])
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break
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}
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}
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}
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text := windows.UTF16ToString(buffer16)
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t.send(text, convertUTF16CountToByteCount(text, start16), convertUTF16CountToByteCount(text, end16), false)
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return nil
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}
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// commit must be called from the main thread.
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func (t *textInput) commit() (ferr error) {
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if t.err != nil {
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return t.err
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}
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hIMC := _ImmGetContext(t.window)
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defer func() {
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if err := _ImmReleaseContext(t.window, hIMC); err != nil && ferr != nil {
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ferr = err
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}
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}()
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bufferLen, err := _ImmGetCompositionStringW(hIMC, _GCS_RESULTSTR, nil, 0)
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if err != nil {
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return err
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}
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if bufferLen == 0 {
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return nil
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}
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buffer16 := make([]uint16, bufferLen/uint32(unsafe.Sizeof(uint16(0))))
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if _, err := _ImmGetCompositionStringW(hIMC, _GCS_RESULTSTR, unsafe.Pointer(&buffer16[0]), bufferLen); err != nil {
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return err
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}
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text := windows.UTF16ToString(buffer16)
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t.send(text, 0, len(text), true)
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return nil
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}
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