WPF学习笔记（七）面板

很长一段时间不想学习WPF了，每次开电脑就停留在网页上。不说废话了。。。。。。。

先来一张截图：

 这是面板布局中的基本步骤，如果要自定义面板的话， 一般选择直接继承自Panel，然后只需重载Messure,Arrange就行。

下面是我的一个示例：

 截图：

  是一个将控件围绕中心排列的自定义面板，图中的按钮围绕中心旋转，可以用在某些需要简单验证条件的场合。

 下面是主要代码：

 

using System;
using System.Windows;
using System.Windows.Media;
using System.Windows.Input;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using System.Windows.Controls.Primitives;
using System.Windows.Documents;
using System.Windows.Threading;

namespace xiaohai.CirclePanel
{
    class CirclePanel : Panel  //面板特征：定时转动，公布两个方法TimerControl1:开始,TimerControl2：停止  ，用于从外部控制定时器。
    {
        double angleEach;
        Size sizeTotal,sizeLargest;
        double radius,x1;
        Point ptCenter;
        double angle = 5;
        public static DependencyProperty OrientationProperty;
        DispatcherTimer tim;
        static CirclePanel()
        {
            OrientationProperty = DependencyProperty.Register("Orientation", typeof(Oritension), typeof(CirclePanel), new FrameworkPropertyMetadata(Oritension.ByWidth, FrameworkPropertyMetadataOptions.AffectsRender));

            
        }
        public Oritension Orientation
        {
            set { SetValue(OrientationProperty, value); }
            get { return (Oritension)GetValue(OrientationProperty); }
        }

        protected override Size MeasureOverride(Size availableSize)
        {
            sizeTotal = new Size(0, 0);
            angleEach = 360.0 / InternalChildren.Count;
            sizeLargest = new Size(0, 0);
            foreach (UIElement ui in InternalChildren)
            {
                ui.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
                sizeLargest.Width = Math.Max(sizeLargest.Width, ui.DesiredSize.Width);
                sizeLargest.Height = Math.Max(sizeLargest.Height, ui.DesiredSize.Height);

            }
             x1 = sizeLargest.Width / (2 * Math.Tan(angleEach * Math.PI / 360));
            radius = Math .Sqrt (  Math .Pow ( ( x1 + sizeLargest.Height),2)+Math .Pow (sizeLargest.Width /2,2));
            sizeTotal.Width += 2 * radius;
            sizeTotal.Height += 2 * radius;
            return sizeTotal;

        }
        protected override Size ArrangeOverride(Size finalSize)
        {
            double multi = Math.Min(finalSize .Width /(2*radius)  ,finalSize .Height /(2*radius)  );
            double angle1 = 0;
            ptCenter = new Point(finalSize.Width / 2, finalSize.Height / 2);
           
            foreach (UIElement ui in InternalChildren)
            {
                ui.RenderTransform = Transform.Identity;
               ui .Arrange (new Rect( ptCenter .X  -sizeLargest .Width *multi /2,ptCenter .Y  -(x1+sizeLargest .Height ) *multi ,sizeLargest.Width*multi  ,sizeLargest .Height*multi   ));
             Point   pt = TranslatePoint(ptCenter , ui);
               ui.RenderTransform = new RotateTransform(angle1, pt.X, pt.Y);
               angle1 += angleEach;
            }
            return finalSize;
        }

        void transform(object sender,EventArgs e)
        {
            
            foreach (UIElement ui in InternalChildren)
            {
                Point pt=TranslatePoint (ptCenter ,ui );
                ui.RenderTransform = new RotateTransform(angle , pt.X, pt.Y);
                angle +=angleEach  ;
            }
            angle += 5;//为什么设置成小于5的时候就出问题。求解。。。
            if (angle == 360) angle = 0;
        }
        public CirclePanel()
        {
             tim = new DispatcherTimer();
            tim.Interval = TimeSpan.FromMilliseconds(50);
            tim.Tick += transform;
            tim.Start();
            
        }
        public void TimerControl1()
        {
            tim.Start();
        }
        public void TimerControl2()
        {
            tim.Stop();
        }
    }
    public enum Oritension
    {
        ByWidth,
        ByHeight
    }


}

　　还可以由控件高度进行排列，上述代码省略了这种选择。其它的扩展在于你的想象。