private bool deleteSelection(android.view.View view, android.text.Editable content
)
{
int selectionStart = android.text.Selection.getSelectionStart(content);
int selectionEnd = android.text.Selection.getSelectionEnd(content);
if (selectionEnd < selectionStart)
{
int temp = selectionEnd;
selectionEnd = selectionStart;
selectionStart = temp;
}
if (selectionStart != selectionEnd)
{
content.delete(selectionStart, selectionEnd);
return(true);
}
return(false);
}
private bool backspaceOrForwardDelete(android.view.View view, android.text.Editable
content, int keyCode, android.view.KeyEvent @event, bool isForwardDelete)
{
// Ensure the key event does not have modifiers except ALT or SHIFT.
if (!android.view.KeyEvent.metaStateHasNoModifiers(@event.getMetaState() & ~(android.view.KeyEvent
.META_SHIFT_MASK | android.view.KeyEvent.META_ALT_MASK)))
{
return(false);
}
// If there is a current selection, delete it.
if (deleteSelection(view, content))
{
return(true);
}
// Alt+Backspace or Alt+ForwardDelete deletes the current line, if possible.
if (@event.isAltPressed() || getMetaState(content, META_ALT_ON) == 1)
{
if (deleteLine(view, content))
{
return(true);
}
}
// Delete a character.
int start = android.text.Selection.getSelectionEnd(content);
int end;
if (isForwardDelete || @event.isShiftPressed() || getMetaState(content, META_SHIFT_ON
) == 1)
{
end = android.text.TextUtils.getOffsetAfter(content, start);
}
else
{
end = android.text.TextUtils.getOffsetBefore(content, start);
}
if (start != end)
{
content.delete(System.Math.Min(start, end), System.Math.Max(start, end));
return(true);
}
return(false);
}
private bool deleteLine(android.view.View view, android.text.Editable content)
{
if (view is android.widget.TextView)
{
android.text.Layout layout = ((android.widget.TextView)view).getLayout();
if (layout != null)
{
int line = layout.getLineForOffset(android.text.Selection.getSelectionStart(content
));
int start = layout.getLineStart(line);
int end = layout.getLineEnd(line);
if (end != start)
{
content.delete(start, end);
return(true);
}
}
}
return(false);
}
