internal static UnsafeNativeMethods.ITfCompositionView GetCurrentCompositionView(UnsafeNativeMethods.ITfDocumentMgr documentMgr)
{
UnsafeNativeMethods.ITfContext tfContext;
documentMgr.GetBase(out tfContext);
UnsafeNativeMethods.ITfCompositionView composition = FrameworkTextComposition.GetComposition(tfContext);
Marshal.ReleaseComObject(tfContext);
return(composition);
}
internal static void CompleteCurrentComposition(UnsafeNativeMethods.ITfDocumentMgr documentMgr)
{
UnsafeNativeMethods.ITfContext tfContext;
documentMgr.GetBase(out tfContext);
UnsafeNativeMethods.ITfCompositionView composition = FrameworkTextComposition.GetComposition(tfContext);
if (composition != null)
{
UnsafeNativeMethods.ITfContextOwnerCompositionServices tfContextOwnerCompositionServices = tfContext as UnsafeNativeMethods.ITfContextOwnerCompositionServices;
tfContextOwnerCompositionServices.TerminateComposition(composition);
Marshal.ReleaseComObject(composition);
}
Marshal.ReleaseComObject(tfContext);
}
internal static FrameworkTextComposition CreateComposition(TextEditor editor, object owner)
{
FrameworkTextComposition composition;
// FrameworkRichTextComposition should be used for RichContent so TextRange is exposed for the application
// to track the composition range.
// FrameworkTextComposition should be used for non-RichContent and TextRange is not exposed.
if (editor.AcceptsRichContent)
{
composition = new FrameworkRichTextComposition(InputManager.UnsecureCurrent, editor.UiScope, owner);
}
else
{
composition = new FrameworkTextComposition(InputManager.Current, editor.UiScope, owner);
}
return composition;
}
/// <summary>
/// Inserts composition text into the document.
/// Raises public text, selection changed events.
/// Called by default editor TextInputEvent handler.
/// </summary>
/// <param name="composition"></param>
internal void UpdateCompositionText(FrameworkTextComposition composition)
{
if (_compositionModifiedByEventListener)
{
// If the app has modified the document since this event was raised
// (by hooking a TextInput event), then we don't know what to do,
// so do nothing.
return;
}
_handledByTextStoreListener = true;
bool isMaxLengthExceeded = false;
string text;
ITextRange range;
if (composition._ResultStart != null)
{
//
// If we're here it means composition is being finalized
//
range = new TextRange(composition._ResultStart, composition._ResultEnd, true /* ignoreTextUnitBoundaries */);
text = this.TextEditor._FilterText(composition.Text, range);
if (text.Length != composition.Text.Length)
{
isMaxLengthExceeded = true;
}
}
else
{
range = new TextRange(composition._CompositionStart, composition._CompositionEnd, true /* ignoreTextUnitBoundaries */);
text = this.TextEditor._FilterText(composition.CompositionText, range, /*filterMaxLength:*/false);
// A change in length should not happen other than for MaxLength filtering during finalization since we cover those
// cases and reject input if necessary when the IME edits the document in the first place.
Invariant.Assert(text.Length == composition.CompositionText.Length);
}
//
// Preparing to create new Composition undo unit and
// set it as the last composition unit.
// this is important for further call to MergeCompositionUndoUnits.
//
_nextUndoUnitIsFirstCompositionUnit = false;
CompositionParentUndoUnit topUndoUnit = PeekCompositionParentUndoUnit();
if (null != topUndoUnit)
{
topUndoUnit.IsLastCompositionUnit = false;
}
CompositionParentUndoUnit compositionUndoUnit = OpenCompositionUndoUnit(range.Start, range.End);
UndoCloseAction undoCloseAction = UndoCloseAction.Rollback;
if (composition._ResultStart != null)
{
// If the composition is being finalized, this will be the last undo unit in this group.
_nextUndoUnitIsFirstCompositionUnit = true;
compositionUndoUnit.IsLastCompositionUnit = true;
}
this.TextSelection.BeginChange();
try
{
this.TextEditor.SetText(range, text, InputLanguageManager.Current.CurrentInputLanguage);
//
if (_interimSelection)
{
this.TextSelection.Select(range.Start, range.End);
}
else
{
this.TextSelection.SetCaretToPosition(range.End, LogicalDirection.Backward, /*allowStopAtLineEnd:*/true, /*allowStopNearSpace:*/true);
}
compositionUndoUnit.RecordRedoSelectionState(range.End, range.End);
undoCloseAction = UndoCloseAction.Commit;
}
finally
{
// We're about to raise the public event.
// Set a flag so we can detect app changes.
_compositionModifiedByEventListener = isMaxLengthExceeded;
// PUBLIC EVENT:
this.TextSelection.EndChange();
CloseTextParentUndoUnit(compositionUndoUnit, undoCloseAction);
}
}
// Inserts composition text into the document.
// Raises public text, selection changed events.
// Returns the position of the inserted text. If includeResultText is
// true, start/end will cover all the inserted text. Otherwise, text
// from offset 0 to resultLength is omitted from start/end.
internal void UpdateCompositionText(FrameworkTextComposition composition, int resultLength, bool includeResultText, out ITextPointer start, out ITextPointer end)
{
start = null;
end = null;
if (_compositionModifiedByEventListener)
{
// If the app has modified the document since this event was raised
// (by hooking a TextInput event), then we don't know what to do,
// so do nothing.
return;
}
_handledByEditorListener = true;
bool isTextFiltered = false;
UndoCloseAction undoCloseAction = UndoCloseAction.Rollback;
OpenCompositionUndoUnit();
try
{
_editor.Selection.BeginChange();
try
{
//
ITextRange range;
string text;
if (composition._ResultStart != null)
{
//
// If we're here it means composition is being finalized
//
range = new TextRange(composition._ResultStart, composition._ResultEnd);
text = this._editor._FilterText(composition.Text, range);
isTextFiltered = (text != composition.Text);
if (isTextFiltered)
{
// If text was filtered we need to update the caret to point
// past the updated text (_caretOffset == text.Length), but we should
// also keep in mind that IMM's are free to have put caret in
// any position so we're chosing minimum of both.
_caretOffset = Math.Min(_caretOffset, text.Length);
}
}
else
{
range = new TextRange(composition._CompositionStart, composition._CompositionEnd);
text = composition.CompositionText;
}
_editor.SetText(range, text, InputLanguageManager.Current.CurrentInputLanguage);
if (includeResultText)
{
start = range.Start;
}
else
{
start = range.Start.CreatePointer(resultLength, LogicalDirection.Forward);
}
end = range.End;
ITextPointer caretPosition = _caretOffset >= 0 ? start.CreatePointer(_caretOffset, LogicalDirection.Forward) : end;
_editor.Selection.Select(caretPosition, caretPosition);
}
finally
{
// We're about to raise the public event.
// Set a flag so we can detect app changes.
_compositionModifiedByEventListener = false;
_editor.Selection.EndChange();
if (isTextFiltered)
{
_compositionModifiedByEventListener = true;
}
}
undoCloseAction = UndoCloseAction.Commit;
}
finally
{
CloseCompositionUndoUnit(undoCloseAction, end);
}
}
// Inserts composition text into the document.
// Raises public text, selection changed events.
// Called by default editor TextInputEvent handler.
internal void UpdateCompositionText(FrameworkTextComposition composition)
{
ITextPointer start;
ITextPointer end;
UpdateCompositionText(composition, 0, true /* includeResultText */
, out start, out end);
}
private bool RaiseTextInputEvent(FrameworkTextComposition composition, string compositionString)
{
composition.Stage = TextCompositionStage.Started;
composition.SetResultPositions(_startComposition, _endComposition, compositionString);
_startComposition = null;
_endComposition = null;
UnregisterMouseListeners();
_handledByEditorListener = false;
// PUBLIC event:
TextCompositionManager.CompleteComposition(composition);
_compositionUndoUnit = null;
return (!_handledByEditorListener || composition.PendingComplete || _compositionModifiedByEventListener);
}
private bool RaiseTextInputUpdateEvent(FrameworkTextComposition composition, int resultLength, string compositionString)
{
composition.Stage = TextCompositionStage.Started;
composition.SetCompositionPositions(_startComposition, _endComposition, compositionString);
// PUBLIC event:
bool handled = TextCompositionManager.UpdateComposition(composition);
if (handled ||
composition.PendingComplete ||
_compositionModifiedByEventListener)
{
return true;
}
// UpdateCompositionText raises a PUBLIC EVENT....
UpdateCompositionText(composition, resultLength, false /* includeResultText */, out _startComposition, out _endComposition);
if (_compositionModifiedByEventListener)
{
return true;
}
return false;
}
private bool RaiseTextInputStartEvent(FrameworkTextComposition composition, int resultLength, string compositionString)
{
composition.Stage = TextCompositionStage.None;
composition.SetCompositionPositions(_editor.Selection.Start, _editor.Selection.End, compositionString);
// PUBLIC event:
bool handled = TextCompositionManager.StartComposition(composition);
if (handled ||
composition.PendingComplete ||
_compositionModifiedByEventListener)
{
return true;
}
// UpdateCompositionText raises a PUBLIC EVENT....
UpdateCompositionText(composition, resultLength, true /* includeResultText */, out _startComposition, out _endComposition);
if (_compositionModifiedByEventListener)
{
return true;
}
RegisterMouseListeners();
return false;
}
