pa-0 / pretimer

A timer for presentation

PreTimer

A timer for presentation

组件需求：Microsoft .NET Framework 4

图标字体来自 FontAwesome

配置文件: [System Disk]:\Users\[username]\AppData\Local\PreTimer

特性：

• WPF 开发，原生高 DPI 支持
• 在扩展桌面显示副计时器
• 增强模式

已知Bug：

• 断开扩展模式，副窗口会保留并在下次计时开始时消失
• 移动窗口时能上下拖动

实现细节

• 导入图标字体

  将字体文件加入 resource

  FontFamily="pack://application:,,,/Resources/#FontAwesome"

  使用 Unicode编码，以及 HEX 色值

  btu_Run.Content = char.ConvertFromUtf32(0xf04b); 
  btu_Run.Foreground = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#FF00cc6a"));

• 跨窗口绑定

  http://www.cnblogs.com/tcjiaan/p/4947073.html

  被绑定的对象的 XAML 加入

  x:FieldModifier="public" 

  于是有

  //Exten.xaml.cs
  public Exten(Window owner)
  {
      Owner = owner;
      InitializeComponent();
      Binding b = new Binding()
      {
          Path = new PropertyPath(TextBlock.TextProperty),
          Source = tb_exten_time,
          UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged, //否则 .Text 不更新
          Mode = BindingMode.OneWayToSource
      };
      MainWindow mw = Owner as MainWindow;
      mw?.tb_time.SetBinding(TextBlock.TextProperty, b);
  }

• 程序从 Alt + Tab 中隐藏

  Hide icon in ALT+TAB

  Window w = new Window(); // Create helper window
  w.Top = -100; // Location of new window is outside of visible part of screen
  w.Left = -100;
  w.Width = 1; // size of window is enough small to avoid its appearance at the beginning
  w.Height = 1;
  w.WindowStyle = WindowStyle.ToolWindow; // Set window style as ToolWindow to avoid its icon in AltTab 
  w.Show(); // We need to show window before set is as owner to our main window
  this.Owner = w; // Okey, this will result to disappear icon for main window.
  w.Hide(); // Hide helper window just in case

• 代码创建新窗口并添加控件

  Window tio = new Window()
  {
      Height = SystemParameters.PrimaryScreenHeight, //当前屏幕高度
      Width = SystemParameters.PrimaryScreenWidth,
      ...
  }
  DockPanel do_te = new DockPanel() {...}
  TextBlock tb_te = new TextBlock() {...}
  do_te.Children.Add(tb_te); // 将 tb_te 加入到 do_te
  tio.Content = do_te; // 将 do_te 加入到tio

• 按键事件

  WPF学习笔记-如何按ESC关闭窗口

  tio.KeyDown += ModifyPrice_KeyDown;
  
  private void ModifyPrice_KeyDown(object sender, KeyEventArgs e)
  {
      if (e.Key == Key.Escape)//Esc键  
      {
          ((Window)sender).Close();
      }
  }

• 双显示器分屏显示

  How to show() a wpf window in secondary monitor

  //App.xaml.cs
  using System.Drawing; //需先添加引用
  using System.Windows.Forms; //需先添加引用
  
  // MainWindow.xaml.cs
  if (System.Windows.Forms.Screen.AllScreens.Length > 1)
  {
      System.Windows.Forms.Screen s2 = System.Windows.Forms.Screen.AllScreens[1];
      System.Drawing.Rectangle r2 = s2.WorkingArea;
      tio.Top = r2.Top;
      tio.Left = r2.Left;
      tio.Height = r2.Height;
      tio.Width = r2.Width;
  }
  tio.Show();
  MegTO meg = new MegTO();
  meg.ShowDialog(); //在主显示器显示，阻塞代码
  tio.Close();

• 计时器

  DispatcherTimer D_Timer = new DispatcherTimer();
  D_Timer.Tick += new EventHandler(D_Timer_Tick);
  D_Timer.Interval = new TimeSpan(0, 0, 1);
  
  private void D_Timer_Tick(object sender, EventArgs e) {...}

• TabControl 与 TabItem 自定义

  自定义 WPF TabControl 的样式/模板

  //setting.xaml
  <Style x:Key="tabCon_style" TargetType="{x:Type TabControl}">
      ...
          <DockPanel x:Name="HeaderPanel" MouseLeftButtonDown="Tab_Dock_1_MouseLeftButtonDown" ...
          //将原来的 TabPanel 改成 DockPanel 并加入 MouseLeftButtonDown 触发 DragMove() 效果
      ...
  </Style>

  于是 TabItem 可以用

  DockPanel.Dock="..."

  调整位置

  <TabItem>
      <TabItem.Header >
          <Button .../> //将 Button 放进 TabItem.Header 实现关闭按钮
      </TabItem.Header>
  </TabItem>

• Hyberlink 的使用

  <Hyperlink NavigateUri="mailto:username@domainname" Click="Hyperlink_Click">word</Hyperlink>// 邮箱

  private void Hyperlink_Click(object sender, RoutedEventArgs e)
  {
      System.Windows.Documents.Hyperlink link = sender as System.Windows.Documents.Hyperlink;
      System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(link.NavigateUri.AbsoluteUri));
  }

• 只能输入限定位数的数字

  //Setting.xaml.cs
  private void Tb_Min_TextChanged(object sender, System.Windows.Controls.TextChangedEventArgs e)
  {
      try
      {
          int val = Convert.ToInt32(tb_Min.Text);
          if (val > 59)
              tb_Min.Text = "";
          if (tb_Min.Text.Length > 2)
              tb_Min.Text = tb_Min.Text.Remove(tb_Min.Text.Length - 1, 1);
      }
      catch
      {
          tb_Min.Text = "";
      }
  }

• 打开文件

  // Setting.xaml.cs
  Microsoft.Win32.OpenFileDialog over_mu = new Microsoft.Win32.OpenFileDialog()
  {
      InitialDirectory = AppDomain.CurrentDomain.BaseDirectory,
      DefaultExt = "*.mp3;*.wav",
      Filter = "常用文件|*.mp3;*.wav|所有文件 (*.*)|*.*"
  };

• 杂项

  string word = Environment.CurrentDirectory (+ @"\...\file.*"); // 获取当前目录
  Application.Current.Shutdown(); // 关闭整个程序