WPF的功能真是強大,居然這麼簡單就可以設定ListBoxItem的顔色
using System;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
class ListWithListBoxItems : Window
{
[STAThread]
public static void Main()
{
Application app = new Application();
app.Run(new ListWithListBoxItems());
}
public ListWithListBoxItems()
{
Title = "List with ListBoxItem";
// Create ListBox as content of window.
ListBox lstbox = new ListBox();
lstbox.Height = 150;
lstbox.Width = 150;
lstbox.SelectionChanged += ListBoxOnSelectionChanged;
Content = lstbox;
// Fill ListBox with ListBoxItem objects.
PropertyInfo[] props = typeof(Colors).GetProperties();
foreach (PropertyInfo prop in props)
{
Color clr = (Color)prop.GetValue(null, null);
bool isBlack = .222 * clr.R + .707 * clr.G + .071 * clr.B > 128;
ListBoxItem item = new ListBoxItem();
item.Content = prop.Name;
item.Background = new SolidColorBrush(clr);
item.Foreground = isBlack ? Brushes.Black : Brushes.White;
item.HorizontalContentAlignment = HorizontalAlignment.Center;
item.Padding = new Thickness(2);
lstbox.Items.Add(item);
}
}
void ListBoxOnSelectionChanged(object sender, SelectionChangedEventArgs args)
{
ListBox lstbox = sender as ListBox;
ListBoxItem item;
if (args.RemovedItems.Count > 0)
{
item = args.RemovedItems[0] as ListBoxItem;
String str = item.Content as String;
item.Content = str.Substring(2, str.Length - 4);
item.FontWeight = FontWeights.Regular;
}
if (args.AddedItems.Count > 0)
{
item = args.AddedItems[0] as ListBoxItem;
String str = item.Content as String;
item.Content = "[ " + str + " ]";
item.FontWeight = FontWeights.Bold;
}
item = lstbox.SelectedItem as ListBoxItem;
if (item != null)
Background = item.Background;
}
}