void CreateContext()
{
ClearContext(); // clear old context if necessary
if (!textArea.Options.EnableImeSupport)
{
return;
}
hwndSource = (HwndSource)PresentationSource.FromVisual(this.textArea);
if (hwndSource != null)
{
//currentContext = ImeNativeWrapper.ImmCreateContext();
//previousContext = ImeNativeWrapper.AssociateContext(hwndSource, currentContext);
currentContext = ImeNativeWrapper.GetContext(hwndSource);
hwndSource.AddHook(WndProc);
// UpdateCompositionWindow() will be called by the caret becoming visible
var threadMgr = ImeNativeWrapper.GetTextFrameworkThreadManager();
if (threadMgr != null)
{
// Even though the docu says passing null is invalid, this seems to help
// activating the IME on the default input context that is shared with WPF
threadMgr.SetFocus(IntPtr.Zero);
}
}
}
public void OnLostFocus(KeyboardFocusChangedEventArgs e)
{
if (e.OldFocus == textArea && currentContext != IntPtr.Zero)
{
ImeNativeWrapper.NotifyIme(currentContext);
}
ClearContext();
}
public void UpdateCompositionWindow()
{
if (currentContext != IntPtr.Zero)
{
ImeNativeWrapper.SetCompositionFont(hwndSource, currentContext, textArea);
ImeNativeWrapper.SetCompositionWindow(hwndSource, currentContext, textArea);
}
}
void ClearContext()
{
if (hwndSource != null)
{
//ImeNativeWrapper.AssociateContext(hwndSource, previousContext);
//ImeNativeWrapper.ImmDestroyContext(currentContext);
ImeNativeWrapper.ReleaseContext(hwndSource, currentContext);
currentContext = IntPtr.Zero;
hwndSource.RemoveHook(WndProc);
hwndSource = null;
}
}