/// <summary>
/// 键盘操作
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnPreviewKeyDown(object sender, KeyEventArgs e)
{
if (_target != sender)
{
return;
}
e.Handled = true;
//如果外部已经禁用用户输入或内部正在处理，终结事件并返回
if (!CanAcceptUserInput || CurrentElement == null)
{
return;
}
#region 输入检查
//控件内部需求检查
e.Handled = false;
//返回值true:继续往下执行，false:停止后续步骤，注意e.Handled决定是否继续内部传递
if (!CurrentElement.OnFlowKeyDown(e))
{
return;
}
e.Handled = true;
var pressKey = "";
if (e.Key == Key.Enter || e.Key == Key.Down || e.Key == Key.Right || e.Key == Key.Tab)
{
pressKey = "DOWN";
}
else if (e.Key == Key.Up || e.Key == Key.Left)
{
pressKey = "UP";
}
#endregion
if (pressKey == "DOWN")
{
MoveFocusHost(FlowNavigation.Forward);
}
else if (pressKey == "UP")
{
MoveFocusHost(FlowNavigation.Backward);
}
else
{
e.Handled = false;
}
}
