为WPF和Silverlight的Grid添加边框线

素颜马尾好姑娘i 2021-11-01 22:02 355阅读 0赞

[为WPF和Silverlight的Grid添加边框线][WPF_Silverlight_Grid](原文链接)

在此源代码的基础上,经过简单修改,保证了边框线条宽度统一.

修改后的源代码

using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Media;
    
    namespace SilverlightApplicationGridBorderSample
    {
        /// <summary>
        /// 为Grid添加的一个特殊功能
        /// 作者：陈希章
        /// 反馈：ares@xizhang.com
        /// </summary>
        public class GridHelper
        {
    
            //请注意：可以通过propa这个快捷方式生成下面三段代码
    
            public static bool GetShowBorder(DependencyObject obj)
            {
                return (bool)obj.GetValue(ShowBorderProperty);
            }
    
            public static void SetShowBorder(DependencyObject obj, bool value)
            {
                obj.SetValue(ShowBorderProperty, value);
            }
    
            public static readonly DependencyProperty ShowBorderProperty =
                DependencyProperty.RegisterAttached("ShowBorder", typeof(bool), typeof(GridHelper), new PropertyMetadata(OnShowBorderChanged));
    
    
            //这是一个事件处理程序，需要手工编写，必须是静态方法
            private static void OnShowBorderChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
            {
                var grid = d as Grid;
                if((bool)e.OldValue)
                {
                    grid.Loaded -= (s, arg) => { };
                }
                if((bool)e.NewValue)
                {
                    grid.Loaded += (s, arg) =>
                    {
                        //这种做法自动将控件移动到Border里面来
                        var controls = grid.Children;
                        var count = controls.Count;
                        
                        for(int i = 0; i < count; i++)
                        {
                            var item = controls[i] as FrameworkElement;
    
                            var row = Grid.GetRow(item);
                            var column = Grid.GetColumn(item);
                            var rowspan = Grid.GetRowSpan(item);
                            var columnspan = Grid.GetColumnSpan(item);
    
                            Border border = new Border();
                            border.BorderBrush = new SolidColorBrush(Colors.LightGray);
    
                            //保证边框线条宽度统一
                            if ((0 == (int)row) && (0 == (int)column))
                            {
                                //第一行第一列
                                border.BorderThickness = new Thickness(1, 1, 1, 1);
                            }
                            else if (0 == (int)row)
                            {
                                //第一行
                                border.BorderThickness = new Thickness(0, 1, 1, 1);
                            }
                            else if (0 == (int)column)
                            {
                                //第一列
                                border.BorderThickness = new Thickness(1, 0, 1, 1);
                            }
                            else
                            {
                                //其它行列,即除去第一行,第一列以为的所有单元格
                                border.BorderThickness = new Thickness(0, 0, 1, 1);
                            }
                            border.Padding = new Thickness(2);
                            //{
                            //    BorderBrush = new SolidColorBrush(Colors.LightGray),
                            //    BorderThickness = new Thickness(1),
                            //    Padding = new Thickness(2)
                            //};
                            
                            Grid.SetRow(border, row);
                            Grid.SetColumn(border, column);
                            Grid.SetRowSpan(border, rowspan);
                            Grid.SetColumnSpan(border, columnspan);
    
                            grid.Children.RemoveAt(i);
                            border.Child = item;
                            grid.Children.Insert(i, border);
                        }
                    };
                }
            }
        }
    }

[WPF_Silverlight_Grid]: http://www.cnblogs.com/chenxizhang/archive/2011/09/22/2185414.html