// See msdn's ITextStoreACP documentation for a full description.
public void InsertTextAtSelection(UnsafeNativeMethods.InsertAtSelectionFlags flags, char[] text, int cch, out int startIndex, out int endIndex, out UnsafeNativeMethods.TS_TEXTCHANGE change)
{
ITextPointer startNavigator;
ITextPointer endNavigator;
int selectionStartIndex;
int selectionEndIndex;
startIndex = -1;
endIndex = -1;
change.start = 0;
change.oldEnd = 0;
change.newEnd = 0;
if (IsReadOnly)
{
throw new COMException(SR.Get(SRID.TextStore_TS_E_READONLY), UnsafeNativeMethods.TS_E_READONLY);
}
//
//
ITextRange range = new TextRange(this.TextSelection.AnchorPosition, this.TextSelection.MovingPosition);
range.ApplyTypingHeuristics(false /* overType */);
ITextPointer start;
ITextPointer end;
GetAdjustedSelection(range.Start, range.End, out start, out end);
// Someone might change the default selection gravity, so use our
// own TextPositions to track the insert.
startNavigator = start.CreatePointer();
startNavigator.SetLogicalDirection(LogicalDirection.Backward);
endNavigator = end.CreatePointer();
endNavigator.SetLogicalDirection(LogicalDirection.Forward);
selectionStartIndex = startNavigator.CharOffset;
selectionEndIndex = endNavigator.CharOffset;
// Do the insert.
if ((flags & UnsafeNativeMethods.InsertAtSelectionFlags.TS_IAS_QUERYONLY) == 0)
{
// Opene a composition undo unit for the composition undo.
CompositionParentUndoUnit unit = OpenCompositionUndoUnit();
UndoCloseAction undoCloseAction = UndoCloseAction.Rollback;
try
{
VerifyTextStoreConsistency();
change.oldEnd = selectionEndIndex;
string filteredText = FilterCompositionString(new string(text), range.Start.GetOffsetToPosition(range.End)); // does NOT filter MaxLength.
if (filteredText == null)
{
throw new COMException(SR.Get(SRID.TextStore_CompositionRejected), NativeMethods.E_FAIL);
}
// We still need to call ApplyTypingHeuristics, even though
// we already did the work above, because it might need
// to spring load formatting.
this.TextSelection.ApplyTypingHeuristics(false /* overType */);
//Invariant.Assert(this.TextSelection.Start.CompareTo(range.Start) == 0 && this.TextSelection.End.CompareTo(range.End) == 0);
// We cannot make this Assertion because TextRange will normalize
// differently around Floater/Inline edges. This is probably
// not desired behavior. To repro,
//
// <StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
// <RichTextBox FontSize="24" Height="150">
// <FlowDocument>
// <Paragraph>
// <Run>para</Run>
// <Floater HorizontalAlignment="Right" Width="100" Background="#FFFF0000">
// <Paragraph><Run>Floater</Run></Paragraph>
// </Floater>
// <Run> </Run>
// </Paragraph>
// </FlowDocument>
// </RichTextBox>
// </StackPanel>
//
// 1. Put the caret before the Floater.
// 2. Shift-right to select the entire Floater.
// 3. Activate the chinese pinyin IME, and press 'a'.
// Avoid calling Select when the selection doesn't need a
// final reposition to preserve any spring loaded formatting
// from ApplyTypingHeuristics.
if (start.CompareTo(this.TextSelection.Start) != 0 ||
end.CompareTo(this.TextSelection.End) != 0)
{
this.TextSelection.Select(start, end);
}
if (!_isComposing && _previousCompositionStartOffset == -1)
{
// IMEs have the option (TF_IAS_NO_DEFAULT_COMPOSITION)
// of inserting text (via this method only) without first
// starting a composition. If that happens, we need
// to remember where the composition started, from the
// point of view of the application listening to events
// we will raise in the future.
_previousCompositionStartOffset = this.TextSelection.Start.Offset;
_previousCompositionEndOffset = this.TextSelection.End.Offset;
}
this.TextEditor.SetSelectedText(filteredText, InputLanguageManager.Current.CurrentInputLanguage);
change.start = startNavigator.CharOffset;
change.newEnd = endNavigator.CharOffset;
ValidateChange(change);
VerifyTextStoreConsistency();
undoCloseAction = UndoCloseAction.Commit;
}
finally
{
// Close a composition undo unit with commit to add the composition undo unit into the undo stack.
CloseTextParentUndoUnit(unit, undoCloseAction);
}
}
// Report the location of the new text.
if ((flags & UnsafeNativeMethods.InsertAtSelectionFlags.TS_IAS_NOQUERY) == 0)
{
startIndex = selectionStartIndex;
endIndex = endNavigator.CharOffset;
}
}