private static void HandleTextSelectionChangedEvent(ProxySimple el, IntPtr hwnd, int eventId)
{
ITextProvider textProvider = el.GetPatternProvider(TextPattern.Pattern) as ITextProvider;
if (textProvider == null)
{
return;
}
if (eventId == NativeMethods.EventObjectLocationChange)
{
// We do not want to raise the EventObjectLocationChange when it is caused by a scroll. To do this
// store the previous range and compare it to the current range. The range will not change when scrolling.
ITextRangeProvider[] currentRanges = textProvider.GetSelection();
ITextRangeProvider currentRange = null;
if (currentRanges != null && currentRanges.Length > 0)
{
currentRange = currentRanges[0];
}
if (hwnd == _hwndLast && currentRange != null)
{
if (_lastSelection != null && !currentRange.Compare(_lastSelection))
{
AutomationInteropProvider.RaiseAutomationEvent(TextPattern.TextSelectionChangedEvent, el, new AutomationEventArgs(TextPattern.TextSelectionChangedEvent));
}
}
else
{
AutomationInteropProvider.RaiseAutomationEvent(TextPattern.TextSelectionChangedEvent, el, new AutomationEventArgs(TextPattern.TextSelectionChangedEvent));
}
//store the current range and window handle.
_hwndLast = hwnd;
_lastSelection = currentRange;
}
else if (eventId == NativeMethods.EventObjectTextSelectionChanged)
{
AutomationInteropProvider.RaiseAutomationEvent(
TextPattern.TextSelectionChangedEvent, el,
new AutomationEventArgs(TextPattern.TextSelectionChangedEvent));
}
}
public bool Compare(string rangePath)
{
ITextRangeProvider p = parent.GetTextRangeFromPath(rangePath).Provider;
return(provider.Compare(p));
}