《WPF程序设计指南》读书笔记——第3章 内容的概念

1.Content属性及字体相关的属性

using System;
using System.Windows;
using System.Windows.Media;

namespace LY.DisplaySomeText
{
    public class DisplaySomeText:Window
    {
        Brush brush = new LinearGradientBrush(Colors.Black, Colors.White, new Point(0, 0), new Point(1, 1));
        [STAThread]
        public static void Main()
        {
            new Application().Run(new DisplaySomeText());            
        }
        public DisplaySomeText()
        {
            Title = "Display Some Text";
            //Content = "Content can be simple text!";            
            //Content = System.EventArgs.Empty;
            Content = DateTime.Now;
            //设置字体系列
            FontFamily = new FontFamily("宋体");
            FontSize = 48;
            FontStyle = FontStyles.Italic;
            FontWeight = FontWeights.Bold;
            //Background = brush;
            Foreground = brush;
            //将窗口大小调整为适应内容的大小
            SizeToContent = SizeToContent.WidthAndHeight;
            //设置边框的画刷
            BorderBrush = Brushes.Red;
            //设置上下左右边框的宽度
            BorderThickness = new Thickness(25, 50, 75, 100);
        }
    }    
}

　　1）没有Font类，需通过FontFamily（字体系列），FontSize、FontStyle、FontWeight等属性来设置。

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

namespace LY.RecordKeyStrokes
{
    public class RecordKeyStrokes:Window
    {
        [STAThread]
        public static void Main()
        {
            Application app = new Application();
            app.Run(new RecordKeyStrokes());
        }
        public RecordKeyStrokes()
        {
            Title = "Record Key Strokes";
            Content = "";
        }
        protected override void OnTextInput(TextCompositionEventArgs e)
        {
            base.OnTextInput(e);
            string str = Content as string;
            if (e.Text == "\b")
            {
                if (str.Length > 0)
                    str = str.Substring(0, str.Length - 1);
            }
            else 
            {
                str += e.Text;
            }
            Content = str;
        }
    }
}

　　1）Content属性的值发生变化后，屏幕会自动更新。

2.图像的显示——Image类、Shape类

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;


namespace LY.ShowMyFace
{
    public class ShowMyFace:Window
    {
        [STAThread]
        public static void Main()
        {
            new Application().Run(new ShowMyFace());
        }
        public ShowMyFace()
        {
            Title = "Show My Face";
            Uri uri = new Uri(@"C:\Users\LZ\Desktop\XX.png");
            BitmapImage bitmap = new BitmapImage(uri);
            Image image = new Image();
            image.Source = bitmap;
            image.HorizontalAlignment = HorizontalAlignment.Left;
            image.VerticalAlignment = VerticalAlignment.Center;
            //设置图片的边界
            image.Margin = new Thickness(10, 20, 30, 40);
            Content = image;
            //显示一个椭圆
            //Ellipse elips = new Ellipse();
            //elips.Fill = Brushes.AliceBlue;
            //elips.StrokeThickness = 50;
            //Content = elips;
        }
    }
}

　　1）通过Image.Source指定一个Image对象的图片实例。

　　2）常见的几何图形类在System.Windows.Shapes命名空间中。

　　3）TextBlock对象可以将一段文字以不同的格式拼接在一起。

　　4）ContentControl类与ContentElement类不同，前者是控件，可以直接显示出来，后者要借助于前者才能显示出来。