/// <summary>
/// Reset the selection and optionally cancel any open compositions.
/// </summary>
/// <param name="cancel">Set to <c>true</c> to also cancel the open composition.</param>
/// <returns><c>true</c> if there was an open composition that we cancelled, otherwise
/// <c>false</c>.</returns>
private bool Reset(bool cancel)
{
if (m_InReset)
{
return(false);
}
bool retVal = false;
m_InReset = true;
try
{
if (cancel)
{
if (m_ActionHandler != null &&
(m_ActionHandler.get_TasksSinceMark(true) || m_Depth != m_ActionHandler.CurrentDepth))
{
m_ActionHandler.Rollback(m_Depth);
retVal = true;
}
else if (m_InitialSelection != null && m_EndOfPreedit != null)
{
var selHelper = SetupForTypingEventHandler(false, true);
if (selHelper != null)
{
// Update selection so that we can delete the preedit-text
UpdateSelectionForReplacingPreeditText(selHelper, 0);
selHelper.SetSelection(true);
if (selHelper.IsValid && selHelper.IsRange)
{
var tss = CreateTsStringUsingSelectionProps(string.Empty, null, false);
selHelper.Selection.ReplaceWithTsString(tss);
}
}
}
}
m_ActionHandler = null;
if (m_InitialSelection != null)
{
m_InitialSelection.RestoreSelection();
}
m_InitialSelection = null;
m_EndOfPreedit = null;
return(retVal);
}
finally
{
m_InReset = false;
OnPreeditClosed();
}
}
/// ------------------------------------------------------------------------------------
/// <summary>
/// Ends the undo task and rolls back any changes that were made
/// </summary>
/// ------------------------------------------------------------------------------------
protected virtual void RollBackChanges()
{
m_actionHandler.Rollback(0);
}