《WPF程序设计指南》读书笔记——第5章 Stack与Wrap

1.StackPanel面板

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Controls;

namespace LY.StactTheButtons
{
    public class StackTheButton:Window
    {
        [STAThread]
        public static void Main()
        {
            new Application().Run(new StackTheButton());
        }
        public StackTheButton()
        {
            Title = "Stack The Button";
            StackPanel stack = new StackPanel();
            stack.Background = Brushes.AliceBlue;
            //设定面板的子元素水平方向排列
            //stack.Orientation = Orientation.Horizontal;
            //设定面板对齐方式为在窗口中央
            //stack.HorizontalAlignment = HorizontalAlignment.Center;
            //将窗体根据内容设定大小
            SizeToContent = SizeToContent.WidthAndHeight;
            ResizeMode = ResizeMode.CanMinimize;
            stack.Margin = new Thickness(5);
            Content = stack;
            Random rand = new Random();
            for (int i = 0; i < 10; i++)
            {
                Button btn = new Button();
                btn.Name = "A" + i;
                //FontSize默认值为System.Windows.SystemFonts.MessageFontSize
                btn.FontSize += rand.Next(10);
                //btn.HorizontalAlignment = HorizontalAlignment.Center;
                btn.Margin = new Thickness(5);
                btn.Content = "Button " + btn.Name + " Says 'Click Me'";
                stack.Children.Add(btn);
                //btn.Click += btn_Click;
            }
            //添加事件，可取代上面的btn.Click+=btn_Click,但两者的区别是sender对象不同
            //AddHandler定义的事件会对面板中的所以button对象起作用
            //这里如果去掉stack也可以，即设定为窗口为sender
            stack.AddHandler(Button.ClickEvent, new RoutedEventHandler(btn_Click));
            stack.Children[0].Focus();
        }
        void btn_Click(object sender, RoutedEventArgs e)
        {
            Button btn = e.Source as Button;
            MessageBox.Show("Button " + btn.Name + " has been clicked", "Button Click");
        }
    }
}

　Stack面板嵌套/ScrollViewer控件/Viewbox控件/e.Source的使用注意

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
namespace LY.StackThirtyButtons
{
    class StackThirtyButtons:Window
    {
        [STAThread]
        public static void Main()
        {
            new Application().Run(new StackThirtyButtons());
        }
        public StackThirtyButtons()
        {
            Title = "嵌套Stack面板";
            AddHandler(Button.ClickEvent, new RoutedEventHandler(Button_Click));

            //使用可滚动区域控件
            ScrollViewer scroll = new ScrollViewer();
            scroll.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
            scroll.VerticalScrollBarVisibility = ScrollBarVisibility.Visible;
            Content = scroll;
            //Viewbox控件可以代替ScrollViewer使用，它没有滚动条，
            //但会根据内容缩放其大小，保证所有内容可见
            //Viewbox view = new Viewbox();
            //Content = view;

            StackPanel mainStack = new StackPanel();
            mainStack.Orientation = Orientation.Horizontal;
            mainStack.Margin = new Thickness(5);
            scroll.Content = mainStack;
            //view.Child = mainStack;
            for (int i = 0; i < 3; i++)
            {
                StackPanel stack = new StackPanel();
                stack.Margin = new Thickness(5);
                mainStack.Children.Add(stack);
                for (int j = 0; j < 10; j++)
                {
                    Button btn = new Button();
                    btn.Content = "Button No. " + (10 * i + j + 1);
                    stack.Children.Add(btn);
                }
            }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
　　　　　　　//e.Source指向Button,而此时Sender是this
            Button btn = e.Source as Button;
            /*
             * 因为AddHandler的Sender是窗口，当点击滚动条上的
             * 按钮（RepeatButton类型，继承自ButtonBase，有Click事件），
             * 则无法转换成Button,btn此时为Null，可以在
             * AddHandler前加上mainStack，将其Sender设定为mainStack
             */
            if (btn != null)
                MessageBox.Show(btn.Content + " has been clicked", "Button Click");
        }
    }
}

　GroupBox控件/RadioButton控件　

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Controls;

namespace LY.TuneTheRadio
{
    class TuneTheRadio : Window
    {
        [STAThread]
        public static void Main()
        {
            new Application().Run(new TuneTheRadio());
        }
        public TuneTheRadio()
        {
            Title = "单选按钮的使用";
            SizeToContent = SizeToContent.WidthAndHeight;
            GroupBox group = new GroupBox();
            //设定GroupBox控件的标头属性
            group.Header = "Window Style属性";
            group.Margin = new Thickness(96);
            group.Padding = new Thickness(5);
            Content = group;
            StackPanel stack = new StackPanel();
            group.Content = stack;
            stack.Children.Add(CreateRadioButton("无边框样式", WindowStyle.None, "1"));
            stack.Children.Add(CreateRadioButton("单边框样式", WindowStyle.SingleBorderWindow, "1"));
            stack.Children.Add(CreateRadioButton("三维边框样式", WindowStyle.ThreeDBorderWindow, "2"));
            stack.Children.Add(CreateRadioButton("固定工具框样式", WindowStyle.ToolWindow, "2"));
            AddHandler(RadioButton.CheckedEvent, new RoutedEventHandler(RadioOnChecked));
        }

        private void RadioOnChecked(object sender, RoutedEventArgs e)
        {
            RadioButton radio = e.Source as RadioButton;
            WindowStyle = (WindowStyle)radio.Tag;
        }

        private RadioButton CreateRadioButton(string strText, WindowStyle winStyle, string groupNum)
        {
            RadioButton radio = new RadioButton();
            //GroupName属性可以将GroupBox中的单选按钮分成组
            radio.GroupName = groupNum;
            radio.Content = strText;
            //存储有关此元素的自定义信息
            radio.Tag = winStyle;
            radio.Margin = new Thickness(5);
            radio.IsChecked = (WindowStyle == winStyle);
            return radio;
        }
    }
}

　　将GroupBox的Content设定为StackPanel，再在StackPanel的Children中加入多个RadioButton。也就是说只有面板Panel中才能放多个控件对象，其他ContentControl只能通过Content放入一个对象。主要的面板控件有：

2.WrapPanel面板

WrapPanel以由左到右，由上到下形式摆放控件；一般用于不确定包含多少个控件时，如资源管理器。平常用StackPanel比较多。
WrapPanel面板一般搭配ScrollViewer控件使用。

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Controls;

namespace LY.ExploreDirectories
{
    class ExploreDirectories : Window
    {
        [STAThread]
        public static void Main()
        {
            new Application().Run(new ExploreDirectories());
        }
        public ExploreDirectories()
        {
            Title = "Explore Directories";
            ScrollViewer scroll = new ScrollViewer();
            Content = scroll;
            WrapPanel wrap = new WrapPanel();
            scroll.Content = wrap;
            wrap.Children.Add(new FileSystemInfoButton());
        }
    }
}

　　

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Controls;
using System.IO;
using System.Diagnostics;

namespace LY.ExploreDirectories
{
    public class FileSystemInfoButton : Button
    {
        FileSystemInfo info;
        public FileSystemInfoButton()
            : this(new DirectoryInfo(
                Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)))
        {
        }
        public FileSystemInfoButton(FileSystemInfo info)
        {
            this.info = info;
            Content = info.Name;
            if (info is DirectoryInfo)
                FontWeight = FontWeights.Bold;
            Margin = new Thickness(10);
        }
        public FileSystemInfoButton(FileSystemInfo info, string str)
            : this(info)
        {
            Content = str;
        }
        protected override void OnClick()
        {
            if (info is FileInfo)
                Process.Start(info.FullName);
            else if (info is DirectoryInfo)
            {
                DirectoryInfo dir = info as DirectoryInfo;
                Application.Current.MainWindow.Title = dir.FullName;
                Panel pnl = Parent as Panel;
                pnl.Children.Clear();
                if (dir.Parent != null)
                    pnl.Children.Add(new FileSystemInfoButton(dir.Parent, ".."));
                foreach (FileSystemInfo inf in dir.GetFileSystemInfos())
                {
                    pnl.Children.Add(new FileSystemInfoButton(inf));
                }
            }
            base.OnClick();
        }
    }
}