SilverLight自定义布局控件

看到葡萄城控件团队里边关于silverlight的布局控件的内部结构和Pro.Silverlight.4布局控件后收益匪浅，自己也顺手参考着例子写了个布局控件。控件类似于Grid，但有一个Count属性，表示一行可以放的控件数量。可以根据自己的需要改变这个属性，来确定一行的显示。

代码

 public class UniformPanel : Panel

    {

//定义Count属性

        public int Count

        {

            get { return (int)GetValue(CountProperty); }

            set { SetValue(CountProperty, value); }

        }

        public static readonly DependencyProperty CountProperty =

            DependencyProperty.Register("Count", typeof(int), typeof(UniformPanel), new PropertyMetadata(new PropertyChangedCallback(CountChanged)));



        private double column;

        private double row;



//根据Count属性计算总终确定的行数和列数

        private void Caculate()

        {

            double childCount = (double)this.Children.Count;

            if (childCount > 0)

            {

                if (childCount > Count)

                {

                    column = Count;

                    row = (int)Math.Ceiling(childCount / Count);

                }

                else if (childCount < Count)

                {

                    column = childCount;

                    row = 1;

                }

            }

        }

//重写MeasureOverrride方法确定最终需要的大小

        protected override Size MeasureOverride(Size availableSize)

        {

            Caculate();

            Size maxSize = new Size(0, 0);

            foreach (UIElement item in this.Children)

            {

                item.Measure(availableSize);

                maxSize.Height = Math.Max(item.DesiredSize.Height, maxSize.Height);

                maxSize.Width = Math.Max(item.DesiredSize.Width, maxSize.Width);

            }

            double maxWidth = Math.Max(maxSize.Width * column, availableSize.Width);

            double maxHeight = Math.Max(maxSize.Height * row, availableSize.Height);

            return new Size(maxWidth, maxHeight);

        }



//重写ArrangOverride方法 

        protected override Size ArrangeOverride(Size finalSize)

        {

            Refresh(finalSize);

            return finalSize;

        }

//Count属性改变触发的事件

        private static void CountChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)

        {

            UniformPanel panel = (UniformPanel)sender;

//如果控件没有定义自己的宽高则默认为200*200,否则将报错

            if (double.IsNaN(panel.Width) || double.IsNaN(panel.Height))

            {

                panel.Height = 200;

                panel.Width = 200;

            }

            panel.Refresh(new Size(panel.Width, panel.Height));

        }



        public  void Refresh(Size finalSize)

        {

            Caculate();

            double x = finalSize.Width / column;

            double y = finalSize.Height / row;

            Rect rect = new Rect(0, 0, x, y);

            foreach (UIElement item in this.Children)

            {

                item.Arrange(rect);

                rect.X+=x;

                if (rect.X >= x * column)

                {

                    rect.Y += y;

                    rect.X = 0;

                    if (rect.Y > y * row)

                        rect = new Rect(0, 0, 0, 0);

                }

            }

        }

    }

设置Count=2效果

设置Count=4效果

 

源码下载