完成Grid示例
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zengwenjie
155
RazorEngineTest/MyGrid.cs
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155
RazorEngineTest/MyGrid.cs
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using System.Windows.Documents;
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using System.Windows.Input;
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using System.Windows.Markup;
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using System.Windows.Media;
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using System.Windows.Media.Animation;
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using System.Windows.Media.Imaging;
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using System.Windows.Navigation;
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using System.Windows.Shapes;
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namespace RazorEngineTest
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{
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[ContentProperty("Children")]
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[TemplatePart(Name = "PART_ChildrenContainer", Type = typeof(ItemsControl))]
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public class MyGrid : Control
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{
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[AllowNull]
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private ItemsControl PART_ChildrenContainer;
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[AllowNull]
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private Grid ChildrenContainer;
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static MyGrid()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(MyGrid), new FrameworkPropertyMetadata(typeof(MyGrid)));
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}
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public MyGrid()
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{
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this.Children = new UICollection();
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this.RowDefinitions = new RowDefinitions();
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this.ColDefinitions = new ColDefinitions();
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}
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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this.PART_ChildrenContainer = this.GetTemplateChild("PART_ChildrenContainer") as ItemsControl;
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if (this.PART_ChildrenContainer != null)
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this.PART_ChildrenContainer.Loaded += PART_ChildrenContainer_Loaded;
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else throw new ArgumentNullException($"「{nameof(MyGrid)}」模版必须定义名称为「PART_ChildrenContainer」的「ItemsControl」类型子元素容器...");
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}
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private void PART_ChildrenContainer_Loaded(object sender, RoutedEventArgs e)
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{
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this.ChildrenContainer = this.PART_ChildrenContainer.FindVisualChild<Grid>("ChildrenContainer");
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if (this.ChildrenContainer != null)
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{
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this.ChildrenContainer.ShowGridLines = DesignerProperties.GetIsInDesignMode(this);
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this.ChildrenContainer.RowDefinitions.Clear();
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foreach (var row in this.RowDefinitions) this.ChildrenContainer.RowDefinitions.Add(row);
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this.ChildrenContainer.ColumnDefinitions.Clear();
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foreach (var col in this.ColDefinitions) this.ChildrenContainer.ColumnDefinitions.Add(col);
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}
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}
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/// <summary>
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/// 子元素集合
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/// </summary>
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public UICollection Children
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{
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get { return (UICollection)GetValue(ChildrenProperty); }
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set { SetValue(ChildrenProperty, value); }
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}
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public static readonly DependencyProperty ChildrenProperty =
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DependencyProperty.Register("Children", typeof(UICollection), typeof(MyGrid), new PropertyMetadata(null,
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(d, e) => (d as MyGrid)?.Children_PropertyChangedCallback(e)));
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/// <summary>
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/// 处理「MyGrid.Children」属性变更
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/// </summary>
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protected virtual void Children_PropertyChangedCallback(DependencyPropertyChangedEventArgs e)
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{
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if (e.OldValue is UICollection oldUIColl) oldUIColl.CollectionChanged -= UICollection_CollectionChanged;
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if (e.NewValue is UICollection newUIColl) newUIColl.CollectionChanged += UICollection_CollectionChanged;
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}
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protected virtual void UICollection_CollectionChanged(object? sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
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{
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//TODO：这里可以处理逻辑树的父子级关系
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}
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/// <summary>
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/// 行定义
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/// </summary>
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public RowDefinitions RowDefinitions
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{
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get { return (RowDefinitions)GetValue(RowDefinitionsProperty); }
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protected internal set { SetValue(RowDefinitionsPropertyKey, value); }
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}
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public static readonly DependencyPropertyKey RowDefinitionsPropertyKey =
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DependencyProperty.RegisterReadOnly("RowDefinitions", typeof(RowDefinitions), typeof(MyGrid), new PropertyMetadata(null,
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(d, e) => (d as MyGrid)?.RowDefinitions_PropertyChangedCallback(e)));
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public static readonly DependencyProperty RowDefinitionsProperty = RowDefinitionsPropertyKey.DependencyProperty;
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/// <summary>
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/// 处理「MyGrid.RowDefinitions」属性变更
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/// </summary>
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protected virtual void RowDefinitions_PropertyChangedCallback(DependencyPropertyChangedEventArgs e)
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{
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if (e.OldValue is RowDefinitions oldRows) oldRows.CollectionChanged -= Rows_CollectionChanged;
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if (e.NewValue is RowDefinitions newRows) newRows.CollectionChanged += Rows_CollectionChanged;
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}
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private void Rows_CollectionChanged(object? sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
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{
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if (this.ChildrenContainer != null)
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{
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this.ChildrenContainer.RowDefinitions.Clear();
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foreach (var row in this.RowDefinitions)
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this.ChildrenContainer.RowDefinitions.Add(row);
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}
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}
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/// <summary>
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/// 列定义
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/// </summary>
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public ColDefinitions ColDefinitions
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{
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get { return (ColDefinitions)GetValue(ColDefinitionsProperty); }
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protected internal set { SetValue(ColDefinitionsPropertyKey, value); }
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}
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public static readonly DependencyPropertyKey ColDefinitionsPropertyKey =
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DependencyProperty.RegisterReadOnly("ColDefinitions", typeof(ColDefinitions), typeof(MyGrid), new PropertyMetadata(null,
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(d, e) => (d as MyGrid)?.ColDefinitions_PropertyChangedCallback(e)));
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public static readonly DependencyProperty ColDefinitionsProperty = ColDefinitionsPropertyKey.DependencyProperty;
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/// <summary>
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/// 处理「MyGrid.ColDefinitions」属性变更
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/// </summary>
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protected virtual void ColDefinitions_PropertyChangedCallback(DependencyPropertyChangedEventArgs e)
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{
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if (e.OldValue is ColDefinitions oldCols) oldCols.CollectionChanged -= Cols_CollectionChanged;
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if (e.NewValue is ColDefinitions newCols) newCols.CollectionChanged += Cols_CollectionChanged;
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}
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private void Cols_CollectionChanged(object? sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
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{
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if (this.ChildrenContainer != null)
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{
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this.ChildrenContainer.ColumnDefinitions.Clear();
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foreach (var col in this.ColDefinitions)
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this.ChildrenContainer.ColumnDefinitions.Add(col);
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}
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}
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}
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[DefaultMember("Items")]
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public class RowDefinitions : ObservableCollection<RowDefinition> { public RowDefinitions() { } }
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[DefaultMember("Items")]
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public class ColDefinitions : ObservableCollection<ColumnDefinition> { public ColDefinitions() { } }
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}
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