学步园

 

源代码下载（vs2010版本）：/Files/timy/dragAndreSize.rar

 

以下是拖放控件的实例代码：

<UserControl x:Class="SilverlightApplication26.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Width="400" Height="300">
    <Grid x:Name="LayoutRoot" Background="#FFD9D7D7">
        <StackPanel>
            <Border Width="100" Height="50" CornerRadius="5"  BorderBrush="Black" BorderThickness="3" MouseLeftButtonDown="Border_MouseLeftButtonDown" MouseMove="Border_MouseMove" MouseEnter="Border_MouseEnter" MouseLeave="Border_MouseLeave"  MouseLeftButtonUp="Border_MouseLeftButtonUp">
                <Button></Button>
            </Border>
        </StackPanel>
      
     
    </Grid>
</UserControl>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Xml;
using System.Windows.Media.Imaging;
using System.Windows.Resources;
using System.IO;
using System.Windows.Browser;
using System.ServiceModel.Channels;
using System.ServiceModel;
using System.Windows.Threading;
using System.Threading;
 
namespace SilverlightApplication26
{
    public partial class Page : UserControl
    {
 
        public Page()
        {
            InitializeComponent();
        }
 
        bool captured = false;
        double ox = -1, oy = -1;
        enum State { None, Left, Buttom, Top, Right };
        State currentstate;
        private void Border_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            Border b = (Border)sender;
            b.CaptureMouse();
            captured = true;
        }
        private void Border_MouseMove(object sender, MouseEventArgs e)
        {
            CheckCursor(sender, e);
            if (captured)
            {
                Border b = (Border)sender;
                Point p = e.GetPosition(null);
                if (ox != -1)
                {
                    switch (currentstate) 
                    {
                        case State.Right: { b.Width += (p.X - ox)*2; break;}
                        case State.Buttom: { b.Height += (p.Y - oy)*2; break; }
                        case State.Top: { b.Height += (oy - p.Y)*2; break; }
                        case State.Left: { b.Width += (ox - p.X)*2; break; }
                    }
                   
                }
                ox = p.X;
                oy = p.Y;
            }
        }
        private void Border_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            Cursor = Cursors.Arrow;
            Border b = (Border)sender;
            b.ReleaseMouseCapture();
            captured = false;
            ox = -1; oy = -1;
        }
        private void Border_MouseLeave(object sender, MouseEventArgs e)
        {if(!captured)
            Cursor = Cursors.Arrow;
        }
        private void Border_MouseEnter(object sender, MouseEventArgs e)
        {
    
            CheckCursor(sender, e);
        }
        void CheckCursor(object sender, MouseEventArgs e)
        {
            Border b = (Border)sender;
            Point p = e.GetPosition(b);
            if (p.X >= b.ActualWidth - b.BorderThickness.Right || p.X <= b.BorderThickness.Left)
            {
                Cursor = Cursors.SizeWE;
                if (p.X >= b.ActualWidth - b.BorderThickness.Right) { currentstate = State.Right; }
                else { currentstate = State.Left; }
            }
            else if (p.Y >= b.ActualHeight - b.BorderThickness.Bottom || p.Y <= b.BorderThickness.Top)
            {
                Cursor = Cursors.SizeNS;
                if (p.Y >= b.ActualHeight - b.BorderThickness.Bottom) { currentstate = State.Buttom; }
                else
                {
                    currentstate = State.Top;
                }
            }
        }
 
    }
  }