private void SetCompositionFont()
{
var lf = new IMENative.LOGFONT();
lf.lfFaceName = Editor.GetFontFamilyName();
lf.lfHeight = Editor.GetFontSize();
var hIMC = _currentContext;
var GCS_COMPSTR = 8;
var length = IMENative.ImmGetCompositionString(hIMC, GCS_COMPSTR, null, 0);
if (length > 0)
{
var target = new byte[length];
var count = IMENative.ImmGetCompositionString(hIMC, GCS_COMPSTR, target, length);
if (count > 0)
{
var inputString = Encoding.Default.GetString(target);
if (string.IsNullOrWhiteSpace(inputString))
{
lf.lfWidth = 1;
}
}
}
Log($"ImmSetCompositionFont");
IMENative.ImmSetCompositionFont(hIMC, ref lf);
}
private void ClearContext()
{
if (_hwndSource == null)
{
return;
}
IMENative.ImmAssociateContext(_hwndSource.Handle, _previousContext);
IMENative.ImmReleaseContext(_defaultImeWnd, _currentContext);
_currentContext = IntPtr.Zero;
_defaultImeWnd = IntPtr.Zero;
_hwndSource.RemoveHook(WndProc);
_hwndSource = null;
}
private void CreateContext()
{
ClearContext();
_hwndSource = (HwndSource)(PresentationSource.FromVisual(Editor) ??
throw new ArgumentNullException(nameof(Editor)));
_defaultImeWnd = IMENative.ImmGetDefaultIMEWnd(IntPtr.Zero);
Log($"_defaultImeWnd={_defaultImeWnd}");
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);
Log($"_defaultImeWnd2={_defaultImeWnd}");
if (_defaultImeWnd == IntPtr.Zero)
{
// 如果依然获取不到，那么使用当前激活的窗口，在准备输入的时候
// 当前的窗口大部分都是对的
// 进入这里，是尽可能恢复输入法，拿到的 GetForegroundWindow 虽然预计是不对的
// 也好过没有输入法
_defaultImeWnd = IMENative.ImmGetDefaultIMEWnd(Win32.User32.GetForegroundWindow());
Log($"_defaultImeWnd3={_defaultImeWnd}");
}
}
// 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);
Log($"_currentContext={_currentContext}");
if (_currentContext == IntPtr.Zero)
{
_currentContext = IMENative.ImmGetContext(_hwndSource.Handle);
Log($"_currentContext2={_currentContext}");
}
// 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);
_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
var threadMgr = IMENative.GetTextFrameworkThreadManager();
threadMgr?.SetFocus(IntPtr.Zero);
}
private void Editor_LostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
Log($"LostKeyboardFocus");
if (_isUpdatingCompositionWindow)
{
return;
}
if (Equals(e.OldFocus, Editor) && _currentContext != IntPtr.Zero)
{
IMENative.ImmNotifyIME(_currentContext, IMENative.NI_COMPOSITIONSTR, IMENative.CPS_CANCEL);
}
ClearContext();
}
private void SetCompositionWindow()
{
var hIMC = _currentContext;
HwndSource source = _hwndSource ?? throw new ArgumentNullException(nameof(_hwndSource));
var textEditorLeftTop = Editor.GetTextEditorLeftTop();
var caretLeftTop = Editor.GetCaretLeftTop();
var transformToAncestor = Editor.TransformToAncestor(source.RootVisual);
var textEditorLeftTopForRootVisual = transformToAncestor.Transform(textEditorLeftTop);
var caretLeftTopForRootVisual = transformToAncestor.Transform(caretLeftTop);
//解决surface上输入法光标位置不正确
//现象是surface上光标的位置需要乘以2才能正确，普通电脑上没有这个问题
//且此问题与DPI无关，目前用CaretWidth可以有效判断
caretLeftTopForRootVisual = new Point(caretLeftTopForRootVisual.X / SystemParameters.CaretWidth,
caretLeftTopForRootVisual.Y / SystemParameters.CaretWidth);
//const int CFS_DEFAULT = 0x0000;
//const int CFS_RECT = 0x0001;
const int CFS_POINT = 0x0002;
//const int CFS_FORCE_POSITION = 0x0020;
//const int CFS_EXCLUDE = 0x0080;
//const int CFS_CANDIDATEPOS = 0x0040;
var form = new IMENative.CompositionForm();
form.dwStyle = CFS_POINT;
form.ptCurrentPos.x = (int)Math.Max(caretLeftTopForRootVisual.X, textEditorLeftTopForRootVisual.X);
form.ptCurrentPos.y = (int)Math.Max(caretLeftTopForRootVisual.Y, textEditorLeftTopForRootVisual.Y);
//if (_isSoftwarePinYinOverWin7)
//{
// form.ptCurrentPos.y += (int) characterBounds.Height;
//}
Log($"ImmSetCompositionWindow x={form.ptCurrentPos.x} y={form.ptCurrentPos.y}");
IMENative.ImmSetCompositionWindow(hIMC, ref form);
}