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using Microsoft.Xaml.Behaviors;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Threading;
namespace FLY.ControlLibrary
{
/// <summary>
/// BUTTON 移动行为，附加行为。
/// </summary>
public class DrapMoveXBehavior : Behavior<UIElement>
{
//
// 摘要:
// 发生时 System.Windows.Controls.Button 时发生。
[Category("Behavior")]
public event EventHandler Move;
bool isDown = false;
Point downPoint;
/// <summary>
/// Move 事件滞后5秒触发
/// </summary>
public bool IsMoveEventDelayTrigger { get; set; } = true;
T GetParent<T>(DependencyObject dobj) where T : DependencyObject
{
//一直向上找，直到找到window
do
{
if (dobj is T)
{
break;
}
dobj = System.Windows.Media.VisualTreeHelper.GetParent(dobj);
} while (dobj != null);
return (T)dobj;
}
DispatcherTimer timer = new DispatcherTimer();
/// <summary>
///
/// </summary>
public DrapMoveXBehavior()
{
timer.Tick += Timer_Tick;
timer.Interval = TimeSpan.FromSeconds(3);
}
private void Timer_Tick(object sender, EventArgs e)
{
timer.Stop();
Move?.Invoke(AssociatedObject, null);
}
/// <summary>
///
/// </summary>
protected override void OnAttached()
{
base.OnAttached();
UIElement dobj = AssociatedObject;
dobj.MouseRightButtonDown += Dobj_MouseRightButtonDown;
dobj.MouseRightButtonUp += Dobj_MouseRightButtonUp;
dobj.MouseMove += Dobj_MouseMove;
dobj.MouseLeave += Dobj_MouseLeave;
parent = GetParent<Grid>(dobj);
}
private void Dobj_MouseLeave(object sender, MouseEventArgs e)
{
isDown = false;
}
private void Dobj_MouseMove(object sender, MouseEventArgs e)
{
//string json = Newtonsoft.Json.JsonConvert.SerializeObject(e);
if (!isDown)
return;
FrameworkElement fe = (FrameworkElement)AssociatedObject;
var downPoint = e.GetPosition(parent);
string json = Newtonsoft.Json.JsonConvert.SerializeObject(downPoint);
//移动
int x = (int)(downPoint.X - this.downPoint.X);
if (Math.Abs(x) < 2)
return;
this.downPoint = downPoint;
var m = fe.Margin;
if (fe.HorizontalAlignment == HorizontalAlignment.Center)
{
m.Right -= x * 2;
}
else if(fe.HorizontalAlignment == HorizontalAlignment.Right)
{
m.Right -= x;
}
else if(fe.HorizontalAlignment == HorizontalAlignment.Left)
{
m.Left += x;
}
fe.Margin = m;
if (IsMoveEventDelayTrigger)
{
timer.Start();
}
else
{
Move?.Invoke(AssociatedObject, null);
}
}
Grid parent;
private void Dobj_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
downPoint = e.GetPosition(parent);
string json = Newtonsoft.Json.JsonConvert.SerializeObject(downPoint);
isDown = true;
}
private void Dobj_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
{
isDown = false;
}
/// <summary>
///
/// </summary>
protected override void OnDetaching()
{
base.OnDetaching();
timer.Stop();
UIElement dobj = AssociatedObject;
dobj.MouseRightButtonDown -= Dobj_MouseRightButtonDown;
dobj.MouseRightButtonUp -= Dobj_MouseRightButtonUp;
dobj.MouseMove -= Dobj_MouseMove;
dobj.MouseLeave -= Dobj_MouseLeave;
}
}
}