45장) Drag&Drop 컨트롤

Drag&Drop 컨트롤

Drag&Drop 컨트롤 사용 방법) <UserControl x:Class="RiaDragDrop.MainPage"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"     mc:Ignorable="d"     d:DesignHeight="300" d:DesignWidth="400">       <Canvas x:Name="lblName" Width="400" Height="300" Background="Silver">         <TextBlock Name="txtDrag" Text="DrageDrop" FontSize="30"></TextBlock>             </Canvas>    </UserControl>   Drag&Drop. Cs 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;   namespace RiaDragDrop {     public partial class MainPage : UserControl     {         private bool isMouseDown = false; //마우스 클릭 중인지 확인         private Point lastPoint = new Point(); //마지막 커서 위치         private Point offset = new Point(); //왼쪽 상단과 개체의 간격 여백           public MainPage()         {             InitializeComponent();                         //[1]Left Button             this.txtDrag.MouseLeftButtonDown += new MouseButtonEventHandler                                                 (txtDrag_MouseLeftButtonDown);               //[2]mouse Move             this.txtDrag.MouseMove += new MouseEventHandler(txtDrag_MouseMove);               ////left over             this.txtDrag.MouseLeftButtonUp += new MouseButtonEventHandler                                                   (txtDrag_MouseLeftButtonUp);           }           //Mouse Over         void txtDrag_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)         {             isMouseDown = false; //클릭되지 않은 상태                                this.txtDrag.ReleaseMouseCapture(); // 캡쳐된 마우스 정보 해제         }           //Mouse Move         void txtDrag_MouseMove(object sender, MouseEventArgs e)         {             if (isMouseDown) // 마우스 클릭상태에서만 드래그             {                 lastPoint = e.GetPosition(null); //재 설정                                 //TextBlock의C Left와 속성 재지정                 txtDrag.SetValue(Canvas.LeftProperty, lastPoint.X - offset.X);                 txtDrag.SetValue(Canvas.TopProperty, lastPoint.Y - offset.Y);             }         }           //Mouse Down         void txtDrag_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)         {             isMouseDown = true; //클릭된 상태             this.txtDrag.CaptureMouse(); //현재 요소의 마우스                                                                             클릭시 마우스에 대한 정보 저장               lastPoint = e.GetPosition(null);             //마우스 위치 반환             //MessageBox.Show(lastPoint.X.ToString());             offset.X = lastPoint.X - Convert.ToDouble                         (txtDrag.GetValue(Canvas.LeftProperty));             offset.Y = lastPoint.Y - Convert.ToDouble                         (txtDrag.GetValue(Canvas.TopProperty));         }     } }