WPF 拖拽帮助类
public class DragDropHelper
{
#region Fields
private FrameworkElement _sourceElement;
private IEnumerable<FrameworkElement> _potentialTargets;
protected bool m_IsDraging = false;
protected Point m_DragStartPoint;
#endregion
#region ctors
public DragDropHelper(FrameworkElement sourceElement)
{
if (sourceElement == null)
throw new ArgumentNullException("sourceElement");
this._sourceElement = sourceElement;
this._sourceElement.PreviewMouseLeftButtonDown += (sender, e) =>
{
m_DragStartPoint = e.GetPosition(null);
};
this._sourceElement.PreviewMouseMove += HandleSourceElement_PreviewMouseMove;
}
#endregion
#region Properties
/// 使用：
//支持拖放的控件目标集合
var list=new list<object>(){
this.textbox1,this.textbox2,this.richTextBox1};
//treeView是拖放的控件源
new Helper.DragDropHelper(treeView)
{
CanDragSourcePredicter = helper =>
{
return (helper.SourceElement as System.Windows.Controls.TreeView).SelectedItem as Person!= null;
},
CreateDragData = helper =>
{
return new DataObject(((helper.SourceElement as System.Windows.Controls.TreeView).SelectedItem as Person).Name);
},
PotentialTargets = list,
DropHandler = (receiver, e) =>
{
try
{
var name= (int)e.Data.GetData(typeof(string));
//处理拖放操作
}
catch (Exception error)
{
}
},
};