141 lines
4.7 KiB
C#
141 lines
4.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Text;
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using CPF.Drawing;
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namespace CPF.Controls
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{
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/// <summary>
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/// 内容模板
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/// </summary>
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[Description("内容模板"), Browsable(false)]
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public class ContentTemplate : Control
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{
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[PropertyMetadata(null)]
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public object Content
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{
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get { return GetValue(); }
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set { SetValue(value); }
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}
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public string ContentStringFormat
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{
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get { return GetValue<string>(); }
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set { SetValue(value); }
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}
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protected override void InitializeComponent()
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{
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Action<object, object> action = (content, old) =>
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{
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if (old != null && content != null && old.GetType() == content.GetType())
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{//如果类型不变就不用重新创建元素
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return;
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}
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if (content != null && !(content is UIElement) && !(content is Image))
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{
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Child = new TextBlock
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{
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Bindings =
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{
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{
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nameof(TextBlock.Text),
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nameof(Content),
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1,
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BindingMode.OneWay,
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Convert
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}
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}
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};
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}
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else if (content is Image image)
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{
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Child = new Picture
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{
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MaxHeight = "100%",
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MaxWidth = "100%",
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StretchDirection = StretchDirection.DownOnly,
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Stretch = Stretch.Uniform,
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Bindings =
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{
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{
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nameof(Picture.Source),
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nameof(Content),
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1,
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BindingMode.OneWay
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}
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}
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};
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}
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};
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if (Content != null)
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{
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action(Content, null);
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}
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Commands.Add(nameof(Content), (s, e) => action(((CPFPropertyChangedEventArgs)e).NewValue, ((CPFPropertyChangedEventArgs)e).OldValue));
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}
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protected object Convert(object a)
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{
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var v = a == null ? "" : (string.IsNullOrWhiteSpace(ContentStringFormat) ? a.ToString() : string.Format(ContentStringFormat, a.ToString()));
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return v;
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}
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protected override void OnOverrideMetadata(OverrideMetadata overridePropertys)
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{
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base.OnOverrideMetadata(overridePropertys);
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overridePropertys.Override(nameof(Width), new UIPropertyMetadataAttribute(typeof(FloatField), "100%", UIPropertyOptions.AffectsMeasure));
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overridePropertys.Override(nameof(Height), new UIPropertyMetadataAttribute(typeof(FloatField), "100%", UIPropertyOptions.AffectsMeasure));
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}
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/// <summary>
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/// 获取或设置 单一子元素。
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/// </summary>
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[Browsable(false)]
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protected UIElement Child
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{
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get { return GetValue<UIElement>(); }
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set { SetValue(value); }
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}
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[PropertyChanged(nameof(Child))]
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void OnChild(object newValue, object oldValue, PropertyMetadataAttribute attribute)
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{
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var o = oldValue as UIElement;
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if (o != null)
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{
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Children.Remove(o);
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}
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var c = newValue as UIElement;
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if (c != null)
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{
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Children.Add(c);
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}
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}
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//protected override void OnPropertyChanged(string propertyName, object oldValue, object newValue, PropertyMetadataAttribute propertyMetadata)
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//{
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// base.OnPropertyChanged(propertyName, oldValue, newValue, propertyMetadata);
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// if (propertyName == nameof(Child))
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// {
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// var o = oldValue as UIElement;
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// if (o != null)
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// {
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// Children.Remove(o);
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// }
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// var c = newValue as UIElement;
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// if (c != null)
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// {
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// Children.Add(c);
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// }
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// }
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//}
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protected override void OnUIElementRemoved(UIElementRemovedEventArgs e)
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{
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base.OnUIElementRemoved(e);
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if (e.Element == Child)
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{
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Child = null;
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}
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}
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}
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}
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