Question

dbtreeview怎么带checkbox delphi 第 1 页

Answer 1

　　在web开发中，带checkbox的tree是一个很有用的东东，比如权限选择、分类管理，如果不用sl，单纯用js+css实现是很复杂的，有了SL之后，就变得很轻松了

　　解决方案一：
　　利用Silvelright ToolKit(微软的开源项目)，

　　解决方案二：
　　telerik公司的Rad for Silverlight商业控件

　　不管用哪一种方案，代码都是差不多的，为了实现数据绑定，先创建一个silverlight类库项目BusinessObject，定义数据项实体:
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows.Markup;

namespace BusinessObject
{
/// <summary>
/// 地区数据项
/// </summary>
[ContentProperty("Children")]//指示Children属性是 XAML 的Content内容属性
public class PlaceItem : INotifyPropertyChanged
{
/// <summary>
/// 构造函数
/// </summary>
public PlaceItem()
{
Children = new Collection<PlaceItem>();
IsSelected = true;
}

/// <summary>
/// 地区名称
/// </summary>
public string Name { get; set; }

/// <summary>
/// 地区描述
/// </summary>
public string Description { get; set; }

/// <summary>
/// 得到下级元素容器
/// </summary>
public Collection<PlaceItem> Children { get; private set; }

/// <summary>
/// 是否有子项
/// </summary>
public bool HasChild
{
get
{
return Children.Count > 0;
}
}

/// <summary>
/// 是否选中
/// </summary>
private bool? _isSelected;

/// <summary>
/// 该特性是否想要被安装
/// </summary>
public bool? IsSelected
{
get
{
return _isSelected;
}
set
{
if (value != _isSelected)
{
_isSelected = value;
OnPropertyChanged("IsSelected");
}
}
}

public event PropertyChangedEventHandler PropertyChanged;

/// <summary>
/// 属性改变时触发事件
/// </summary>
/// <param name="propertyName">Property that changed.</param>
private void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (null != handler)
{
handler.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
然后再定义一个 演示数据集合类:
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows.Markup;

namespace BusinessObject
{
/// <summary>
/// 地区数据项
/// </summary>
[ContentProperty("Children")]//指示Children属性是 XAML 的Content内容属性
public class PlaceItem : INotifyPropertyChanged
{
/// <summary>
/// 构造函数
/// </summary>
public PlaceItem()
{
Children = new Collection<PlaceItem>();
IsSelected = true;
}

/// <summary>
/// 地区名称
/// </summary>
public string Name { get; set; }

/// <summary>
/// 地区描述
/// </summary>
public string Description { get; set; }

/// <summary>
/// 得到下级元素容器
/// </summary>
public Collection<PlaceItem> Children { get; private set; }

/// <summary>
/// 是否有子项
/// </summary>
public bool HasChild
{
get
{
return Children.Count > 0;
}
}

/// <summary>
/// 是否选中
/// </summary>
private bool? _isSelected;

/// <summary>
/// 该特性是否想要被安装
/// </summary>
public bool? IsSelected
{
get
{
return _isSelected;
}
set
{
if (value != _isSelected)
{
_isSelected = value;
OnPropertyChanged("IsSelected");
}
}
}

public event PropertyChangedEventHandler PropertyChanged;

/// <summary>
/// 属性改变时触发事件
/// </summary>
/// <param name="propertyName">Property that changed.</param>
private void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (null != handler)
{
handler.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}