WPF小实例:(2)ListBox颜色选取器

本实例来自<<WPF程序设计指南>>一书,感觉还挺不错的,记录下来,方便以后查询

图:

              工程截图:

ColorListBoxItem.cs文件

public class ColorListBoxItem:ListBoxItem
   {
       string str;
       Rectangle rect;      //左侧的颜色方块
       TextBlock text;      //对应的文字
        
       public ColorListBoxItem()
       {
           StackPanel stack = new StackPanel();
           stack.Orientation = Orientation.Horizontal;
           Content = stack;

           //添加颜色方块
           rect = new Rectangle();
           rect.Width = 16;
           rect.Height = 16;
           rect.Margin = new System.Windows.Thickness(2);
           rect.Stroke = SystemColors.WindowTextBrush;
           stack.Children.Add(rect);

           //添加TextBlock
           text = new TextBlock();
           text.VerticalAlignment = VerticalAlignment.Center;
           stack.Children.Add(text);
       }

       
       public string Text
       {
           set
           {
               //在组合词中间添加空格
               str = value;
               string strSpaced = str[0].ToString();
               for (int i = 1; i < str.Length; i++)
               {
                   strSpaced += (Char.IsUpper(str[i]) ? " " : "") + str[i].ToString();
               }
               text.Text = strSpaced;
               //text.Text = value;
           }
           get { return str; }
       }

       //设置方块颜色
       public Color Color
       {
           set { rect.Fill = new SolidColorBrush(value); }
           get
           {
               SolidColorBrush brush = rect.Fill as SolidColorBrush;
               return brush == null ? Colors.Transparent : brush.Color;
           }
       }

       //当选中某一项的时候出发
       protected override void OnSelected(RoutedEventArgs e)
       {
           base.OnSelected(e);
           text.FontWeight = FontWeights.Bold;
       }

       protected override void OnUnselected(RoutedEventArgs e)
       {
           base.OnUnselected(e);
           text.FontWeight = FontWeights.Regular;
       }
       public override string ToString()
       {
           return str; 
       }

   }

ColorListBox.cs文件

public class ColorListBox:ListBox
{
    public ColorListBox()
    {
        PropertyInfo[] props = typeof(Colors).GetProperties();
        foreach (PropertyInfo prop in props)
        {
            //根据Colors内颜色的个数创建ColorListBoxItem
            ColorListBoxItem item = new ColorListBoxItem();
            item.Text = prop.Name;
            item.Color = (Color)prop.GetValue(null,null);
            Items.Add(item);  
        }
        
        SelectedValuePath = "Color";
    }

    //获取或设置当前选中的颜色
    public Color SelectedColor
    {
        set { SelectedValue = value; }
        get { return (null != SelectedValue) ? (Color)SelectedValue : Colors.Transparent; }
    }
}

Window1.Xaml.cs文件

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();

        Title = "List Colors Elegantly";
        ColorListBox lstbox = new ColorListBox();
        lstbox.Height = 150;
        lstbox.Width = 150;
        lstbox.SelectionChanged += ListBoxOnSelectionChanged;
        Content = lstbox;
        lstbox.SelectedColor = SystemColors.WindowColor;//初始化
    }

    void ListBoxOnSelectionChanged(object sender, SelectionChangedEventArgs args)
    {
        ColorListBox lstbox = sender as ColorListBox;
        Background = new SolidColorBrush(lstbox.SelectedColor);
    }
}