WPF在自定义文本框中实现输入法跟随光标

    /// 
 /// 表示控件支持被输入法 /// 
 interface IIMETextEditor { /// 
 /// 获取当前使用的字体名 /// 
 ///  string GetFontFamilyName(); /// 
 /// 获取字号大小，单位和 WPF 的 FontSize 相同 /// 
 ///  int GetFontSize(); /// 
 /// 获取输入框的左上角的点，用于设置输入法的左上角。此点相对于  所在元素坐标。对大部分控件来说，都应该是 0,0 点 /// 
 ///  Point GetTextEditorLeftTop(); /// 
 /// 获取光标的输入左上角的点。此点相对于  所在元素坐标 /// 
 ///  Point GetCaretLeftTop(); } 

    internal class IMESupporter where T : UIElement, IIMETextEditor { // ReSharper disable InconsistentNaming public IMESupporter(T editor) { Editor = editor; // 忽略代码 } } 

        public IMESupporter(T editor) { Editor = editor; Editor.GotKeyboardFocus += Editor_GotKeyboardFocus; Editor.LostKeyboardFocus += Editor_LostKeyboardFocus; } private T Editor { get; } 

InputMethod.SetIsInputMethodSuspended(editor, true); 

_defaultImeWnd = IMENative.ImmGetDefaultIMEWnd(IntPtr.Zero); 

private T Editor { get; } private IntPtr _defaultImeWnd; private IntPtr _currentContext; private IntPtr _previousContext; private HwndSource? _hwndSource; private bool _isUpdatingCompositionWindow; 

            if (_defaultImeWnd == IntPtr.Zero) { // 如果拿到了空的默认 IME 窗口了，那么此时也许是作为嵌套窗口放入到另一个进程的窗口 // 拿不到就需要刷新一下。否则微软拼音输入法将在屏幕的左上角上 RefreshInputMethodEditors(); // 忽略代码 } /// 
 /// 刷新 IME 的 ITfThreadMgr 状态，用于修复打开 Win32Dialog 之后关闭，输入法无法输入中文问题 /// 
 /// 原因是在打开 Win32Dialog 之后，将会让 ITfThreadMgr 失去焦点。因此需要使用本方法刷新，通过 InputMethod 的 IsInputMethodEnabledProperty 属性调用到 InputMethod 的 EnableOrDisableInputMethod 方法，在这里面调用到 TextServicesContext.DispatcherCurrent.SetFocusOnDefaultTextStore 方法，从而调用到 SetFocusOnDim(DefaultTextStore.Current.DocumentManager) 的代码，将 DefaultTextStore.Current.DocumentManager 设置为 ITfThreadMgr 的焦点，重新绑定 IME 输入法 /// 但是即使如此，依然拿不到  的初始值。依然需要重新打开和关闭 WPF 窗口才能拿到 /// [Can we public the `DefaultTextStore.Current.DocumentManager` property to create custom TextEditor with IME · Issue #6139 · dotnet/wpf](https://github.com/dotnet/wpf/issues/6139 ) private void RefreshInputMethodEditors() { if (InputMethod.GetIsInputMethodEnabled(Editor)) { InputMethod.SetIsInputMethodEnabled(Editor, false); } if (InputMethod.GetIsInputMethodSuspended(Editor)) { InputMethod.SetIsInputMethodSuspended(Editor, false); } InputMethod.SetIsInputMethodEnabled(Editor, true); InputMethod.SetIsInputMethodSuspended(Editor, true); } 

            _hwndSource = (HwndSource) (PresentationSource.FromVisual(Editor) ?? throw new ArgumentNullException(nameof(Editor))); if (_defaultImeWnd == IntPtr.Zero) { // 如果拿到了空的默认 IME 窗口了，那么此时也许是作为嵌套窗口放入到另一个进程的窗口 // 拿不到就需要刷新一下。否则微软拼音输入法将在屏幕的左上角上 RefreshInputMethodEditors(); // 尝试通过 _hwndSource 也就是文本所在的窗口去获取 _defaultImeWnd = IMENative.ImmGetDefaultIMEWnd(_hwndSource.Handle); // 忽略代码 } 

                _defaultImeWnd = IMENative.ImmGetDefaultIMEWnd(_hwndSource.Handle); if (_defaultImeWnd == IntPtr.Zero) { // 如果依然获取不到，那么使用当前激活的窗口，在准备输入的时候 // 当前的窗口大部分都是对的 // 进入这里，是尽可能恢复输入法，拿到的 GetForegroundWindow 虽然预计是不对的 // 也好过没有输入法 _defaultImeWnd = IMENative.ImmGetDefaultIMEWnd(Win32.User32.GetForegroundWindow()); } 

// 使用 DefaultIMEWnd 可以比较好解决微软拼音的输入法到屏幕左上角的问题 _currentContext = IMENative.ImmGetContext(_defaultImeWnd); 

_currentContext = IMENative.ImmGetContext(_defaultImeWnd); if (_currentContext == IntPtr.Zero) { _currentContext = IMENative.ImmGetContext(_hwndSource.Handle); } 

// 对 Win32 使用第二套输入法框架的输入法，可以采用 ImmAssociateContext 关联 // 但是对实现 TSF 第三套输入法框架的输入法，在应用程序对接第三套输入法框架 // 就需要调用 ITfThreadMgr 的 SetFocus 方法。刚好 WPF 对接了 _previousContext = IMENative.ImmAssociateContext(_hwndSource.Handle, _currentContext); 

_previousContext = IMENative.ImmAssociateContext(_hwndSource.Handle, _currentContext); _hwndSource.AddHook(WndProc); 

// 尽管文档说传递null是无效的，但这似乎有助于在与WPF共享的默认输入上下文中激活IME输入法 // 这里需要了解的是，在 WPF 的逻辑，是需要传入 DefaultTextStore.Current.DocumentManager 才符合预期 IMENative.ITfThreadMgr? threadMgr = IMENative.GetTextFrameworkThreadManager(); threadMgr?.SetFocus(IntPtr.Zero); 

var textEditorLeftTop = Editor.GetTextEditorLeftTop(); var caretLeftTop = Editor.GetCaretLeftTop(); 

var hIMC = _currentContext; HwndSource source = _hwndSource; var textEditorLeftTop = Editor.GetTextEditorLeftTop(); var caretLeftTop = Editor.GetCaretLeftTop(); var transformToAncestor = Editor.TransformToAncestor(source.RootVisual); var textEditorLeftTopForRootVisual = transformToAncestor.Transform(textEditorLeftTop); var caretLeftTopForRootVisual = transformToAncestor.Transform(caretLeftTop); 

//解决surface上输入法光标位置不正确 //现象是surface上光标的位置需要乘以2才能正确，普通电脑上没有这个问题 //且此问题与DPI无关，目前用CaretWidth可以有效判断 caretLeftTopForRootVisual = new Point(caretLeftTopForRootVisual.X / SystemParameters.CaretWidth, caretLeftTopForRootVisual.Y / SystemParameters.CaretWidth); 

            //const int CFS_DEFAULT = 0x0000; //const int CFS_RECT = 0x0001; const int CFS_POINT = 0x0002; //const int CFS_FORCE_POSITION = 0x0020; //const int CFS_EXCLUDE = 0x0080; //const int CFS_CANDIDATEPOS = 0x0040; var form = new IMENative.CompositionForm(); form.dwStyle = CFS_POINT; form.ptCurrentPos.x = (int) Math.Max(caretLeftTopForRootVisual.X, textEditorLeftTopForRootVisual.X); form.ptCurrentPos.y = (int) Math.Max(caretLeftTopForRootVisual.Y, textEditorLeftTopForRootVisual.Y); //if (_isSoftwarePinYinOverWin7) //{ //    form.ptCurrentPos.y += (int) characterBounds.Height; //} IMENative.ImmSetCompositionWindow(hIMC, ref form); 

        private IntPtr WndProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { switch (msg) { // 忽略代码 case IMENative.WM_INPUTLANGCHANGE: if (_hwndSource != null) { CreateContext(); } // 忽略代码 break; } return IntPtr.Zero; } 

        private IntPtr WndProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { switch (msg) { // 忽略代码 case IMENative.WM_IME_COMPOSITION: UpdateCompositionWindow(); break; // 忽略代码 } return IntPtr.Zero; } 

    public partial class TextEditor : FrameworkElement, IIMETextEditor { // 忽略代码 protected override void OnRender(DrawingContext drawingContext) { drawingContext.DrawRectangle(Brushes.Black,null,new Rect(MouseDownPoint,new Size(3,30))); base.OnRender(drawingContext); } protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters) { // 让控件接收点击 return new PointHitTestResult(this, hitTestParameters.HitPoint); } protected override void OnMouseDown(MouseButtonEventArgs e) { MouseDownPoint = e.GetPosition(this); Focus(); InvalidateVisual(); } private Point MouseDownPoint { get; set; } string IIMETextEditor.GetFontFamilyName() { return "微软雅黑"; } int IIMETextEditor.GetFontSize() { return 30; } Point IIMETextEditor.GetTextEditorLeftTop() { // 相对于当前输入框的坐标 return new Point(0, 0); } Point IIMETextEditor.GetCaretLeftTop() { return MouseDownPoint; } } 

        static TextEditor() { // 用于接收 Tab 按键，而不是被切换焦点 KeyboardNavigation.IsTabStopProperty.OverrideMetadata(typeof(TextEditor), new FrameworkPropertyMetadata(true)); KeyboardNavigation.TabNavigationProperty.OverrideMetadata(typeof(TextEditor), new FrameworkPropertyMetadata(KeyboardNavigationMode.None)); // 用于获取焦点逻辑 FocusableProperty.OverrideMetadata(typeof(TextEditor), new FrameworkPropertyMetadata(true)); } 

        public TextEditor() { // 忽略代码 _imeSupporter = new IMESupporter(this); } private readonly IMESupporter _imeSupporter; 

git init git remote add origin https://gitee.com/lindexi/lindexi_gd.git git pull origin b3a1fffece8284d0b84407aa13d949de6a2f1536 

git remote remove origin git remote add origin https://github.com/lindexi/lindexi_gd.git