private void ScnModified(ref NativeMethods.SCNotification scn)
{
// The InsertCheck, BeforeInsert, BeforeDelete, Insert, and Delete events can all potentially require
// the same conversions: byte to char position, char* to string, etc.... To avoid doing the same work
// multiple times we share that data between events.
if ((scn.modificationType & NativeMethods.SC_MOD_INSERTCHECK) > 0)
{
var eventArgs = new InsertCheckEventArgs(this, scn.position, scn.length, scn.text);
OnInsertCheck(eventArgs);
cachedPosition = eventArgs.CachedPosition;
cachedText = eventArgs.CachedText;
}
const int sourceMask = (NativeMethods.SC_PERFORMED_USER | NativeMethods.SC_PERFORMED_UNDO | NativeMethods.SC_PERFORMED_REDO);
if ((scn.modificationType & (NativeMethods.SC_MOD_BEFOREDELETE | NativeMethods.SC_MOD_BEFOREINSERT)) > 0)
{
var source = (ModificationSource)(scn.modificationType & sourceMask);
var eventArgs = new BeforeModificationEventArgs(this, source, scn.position, scn.length, scn.text);
eventArgs.CachedPosition = cachedPosition;
eventArgs.CachedText = cachedText;
if ((scn.modificationType & NativeMethods.SC_MOD_BEFOREINSERT) > 0)
{
OnBeforeInsert(eventArgs);
}
else
{
OnBeforeDelete(eventArgs);
}
cachedPosition = eventArgs.CachedPosition;
cachedText = eventArgs.CachedText;
}
if ((scn.modificationType & (NativeMethods.SC_MOD_DELETETEXT | NativeMethods.SC_MOD_INSERTTEXT)) > 0)
{
var source = (ModificationSource)(scn.modificationType & sourceMask);
var eventArgs = new ModificationEventArgs(this, source, scn.position, scn.length, scn.text, scn.linesAdded);
eventArgs.CachedPosition = cachedPosition;
eventArgs.CachedText = cachedText;
if ((scn.modificationType & NativeMethods.SC_MOD_INSERTTEXT) > 0)
{
OnInsert(eventArgs);
}
else
{
OnDelete(eventArgs);
}
// Always clear the cache
cachedPosition = null;
cachedText = null;
// For backward compatibility.... Of course this means that we'll raise two
// TextChanged events for replace (insert/delete) operations, but that's life.
OnTextChanged(EventArgs.Empty);
}
if ((scn.modificationType & NativeMethods.SC_MOD_CHANGEANNOTATION) > 0)
{
var eventArgs = new ChangeAnnotationEventArgs(scn.line);
OnChangeAnnotation(eventArgs);
}
}
/// <summary>
/// Raises the <see cref="ChangeAnnotation" /> event.
/// </summary>
/// <param name="e">A <see cref="ChangeAnnotationEventArgs" /> that contains the event data.</param>
protected virtual void OnChangeAnnotation(ChangeAnnotationEventArgs e)
{
var handler = Events[changeAnnotationEventKey] as EventHandler<ChangeAnnotationEventArgs>;
if (handler != null)
handler(this, e);
}