WPF使用笔记-计时器,多线程更新界面,焦点移动等

实习期间开始使用WPF,记录一点东西,没什么技术含量。

// 计时器

System.Windows.Threading.DispatcherTimer ShowTimer;

ShowTimer = new System.Windows.Threading.DispatcherTimer();

ShowTimer.Tick += new EventHandler(ShowCurTimer);

ShowTimer.Interval = new TimeSpan(0, 0, 0, 1, 0);

ShowTimer.Start();

private void ShowCurTimer(object sender, EventArgs e)

{

  // 时分秒 this.TimeText.Text = DateTime.Now.ToString("HH:mm:ss");

  // 日期 农历 5月1日 星期日

  string MM = DateTime.Now.ToString("MM").TrimStart('0');

   string dd = DateTime.Now.ToString("dd").TrimStart('0');

   this.DateText.Text = "阳历 ";

  this.DateText.Text += MM;

  this.DateText.Text += "月";

   this.DateText.Text += dd;

   this.DateText.Text += "日 ";

   this.DateText.Text += DateTime.Now.ToString("dddd", new System.Globalization.CultureInfo("zh-cn"));

}

 

// 线程

System.Threading.Thread threadRead;

// 互斥锁(看情况使用)

object lockMe = new object();

threadRead = new System.Threading.Thread(threadReadFun);

threadRead.Start();

private void threadReadFun()

{

  while (true)

  {

    System.Threading.Thread.Sleep(TimeSpan.FromSeconds(0.5));

     // 上锁 lock (lockMe) { }

     // 多线程中更新界面

     this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new delegate1(show));

  }

}

// 上述线程中无法对界面控件进行更新,可定义委托用于在多线程中更新界面

public delegate void delegate1();

private void show()

{

  this.TextBlockName.Text = "new";

}

 

// 后台操作控件,可通过查找Name

((Image)this.FindName("Image1")).Visibility = System.Windows.Visibility.Hidden;

 

// 多窗口关闭

// xaml

Closing="onClosing"

// cs

private void onClosing(object sender, System.ComponentModel.CancelEventArgs e)

{

  Environment.Exit(0);

}

 

// TextBox

GotFocus, LostFocus 获得和失去焦点事件,Tab获得焦点后使用 TextBox.SelectAll()选中所有内容 这对键盘重新输入内容很方便


使用按键控制焦点移动:

private void keyDown(object sender, KeyEventArgs e)
{
  UIElement element = Keyboard.FocusedElement as UIElement;
  if (e.Key == Key.A)
  {
    if (element != null)
    {
      element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Previous));
      e.Handled = true;
    }
  }
  else if (e.Key == Key.D)
  {
    if (element != null)
    {
      element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
      e.Handled = true;
    }
  }
  else if (e.Key == Key.W)
  {
    if (element != null)
    {
      element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Up));
      e.Handled = true;
    }
  }
  else if (e.Key == Key.S)
  {
    if (element != null)
    {
      element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Down));
      e.Handled = true;
    }
  }
  else
  {
    return;
  }
}

 

posted @ 2016-05-07 16:24  ht-beyond  阅读(771)  评论(0编辑  收藏  举报