void MainWindow::onTimelineSelectionChanged()
{
    bool enable = (m_timelineDock->selection().size() > 0);
    ui->actionCut->setEnabled(enable);
    ui->actionCopy->setEnabled(enable);
}
void MainWindow::onTimelineSelectionChanged()
{
    bool enable = (m_timelineDock->selection().size() > 0);
    ui->actionCut->setEnabled(enable);
    ui->actionCopy->setEnabled(enable);
}