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▶ DragHelper.cs
using System.Windows;
using System.Windows.Input;
using System.Windows.Controls;
using System.Windows.Media;
namespace TestProject
{
/// <summary>
/// 드래그 헬퍼
/// </summary>
public class DragHelper : DependencyObject
{
//////////////////////////////////////////////////////////////////////////////////////////////////// Dependency Property
////////////////////////////////////////////////////////////////////////////////////////// Static
//////////////////////////////////////////////////////////////////////////////// Private
#region 드래그 여부 속성 - DragProperty
/// <summary>
/// 드래그 여부 속성
/// </summary>
public static readonly DependencyProperty DragProperty = DependencyProperty.RegisterAttached
(
"Drag",
typeof(bool),
typeof(DragHelper),
new UIPropertyMetadata(false, DragPropertyChangedCallback)
);
#endregion
//////////////////////////////////////////////////////////////////////////////////////////////////// Field
////////////////////////////////////////////////////////////////////////////////////////// Static
//////////////////////////////////////////////////////////////////////////////// Private
#region Field
/// <summary>
/// 윈도우
/// </summary>
private static Window _window;
/// <summary>
/// 드래그 시작 포인트
/// </summary>
private static Point _dragStartPoint;
/// <summary>
/// 드래그 엘리먼트
/// </summary>
private static FrameworkElement _drgaElement;
/// <summary>
/// 드래그 Z 인덱스
/// </summary>
private static int _dragZIndex;
#endregion
//////////////////////////////////////////////////////////////////////////////////////////////////// Method
////////////////////////////////////////////////////////////////////////////////////////// Static
//////////////////////////////////////////////////////////////////////////////// Public
#region 윈도우 설정하기 - SetWindow(window)
/// <summary>
/// 윈도우 설정하기
/// </summary>
/// <param name="window">윈도우</param>
public static void SetWindow(Window window)
{
_window = window;
}
#endregion
#region 드래그 여부 설정하기 - SetDrag(element, flag)
/// <summary>
/// 드래그 여부 설정하기
/// </summary>
/// <param name="element">엘리먼트</param>
/// <param name="flag">플래그</param>
public static void SetDrag(UIElement element, bool flag)
{
if(_window != null)
{
element.SetValue(DragProperty, flag);
}
}
#endregion
#region 드래그 여부 구하기 - GetDrag(UIElement element)
/// <summary>
/// 드래그 여부 구하기
/// </summary>
/// <param name="element">엘리먼트</param>
/// <returns>드래그 여부</returns>
public static bool GetDrag(UIElement element)
{
return (bool)element.GetValue(DragProperty);
}
#endregion
//////////////////////////////////////////////////////////////////////////////// Private
#region 윈도우 PREVIEW 마우스 이동시 처리하기 - window_PreviewMouseMove(sender, e)
/// <summary>
/// 윈도우 PREVIEW 마우스 이동시 처리하기
/// </summary>
/// <param name="sender">이벤트 발생자</param>
/// <param name="e">이벤트 인자</param>
private static void window_PreviewMouseMove(object sender, MouseEventArgs e)
{
if(_drgaElement != null && e.LeftButton == MouseButtonState.Pressed || e.RightButton == MouseButtonState.Pressed)
{
Point mousePoint = e.GetPosition(_drgaElement);
TranslateTransform transform = _drgaElement.RenderTransform as TranslateTransform;
if(transform != null)
{
_drgaElement.LayoutTransform = transform;
transform.X += mousePoint.X - _dragStartPoint.X;
transform.Y += mousePoint.Y - _dragStartPoint.Y;
}
}
}
#endregion
#region 엘리먼트 PREVIEW 마우스 DOWN 처리하기 - element_PreviewMouseDown(sender, e)
/// <summary>
/// 엘리먼트 PREVIEW 마우스 DOWN 처리하기
/// </summary>
/// <param name="sender">이벤트 발생자</param>
/// <param name="e">이벤트 인자</param>
private static void element_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
_drgaElement = sender as FrameworkElement;
_dragZIndex = Canvas.GetZIndex(_drgaElement);
Canvas.SetZIndex(_drgaElement, 100);
_dragStartPoint = e.GetPosition(_drgaElement);
_window.PreviewMouseMove += window_PreviewMouseMove;
}
#endregion
#region 엘리먼트 PREVIEW 마우스 UP 처리하기 - element_PreviewMouseUp(sender, e)
/// <summary>
/// 엘리먼트 PREVIEW 마우스 UP 처리하기
/// </summary>
/// <param name="sender">이벤트 발생자</param>
/// <param name="e">이벤트 인자</param>
private static void element_PreviewMouseUp(object sender, MouseButtonEventArgs e)
{
FrameworkElement element = sender as FrameworkElement;
Canvas.SetZIndex(element, _dragZIndex);
_drgaElement = _window;
_window.MouseMove -= window_PreviewMouseMove;
}
#endregion
#region 드래그 속성 변경시 콜백 처리하기 - DragPropertyChangedCallback(d, e)
/// <summary>
/// 드래그 속성 변경시 콜백 처리하기
/// </summary>
/// <param name="d">의존 객체</param>
/// <param name="e">이벤트 인자</param>
private static void DragPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
FrameworkElement element = d as FrameworkElement;
if(element != null)
{
if((bool)e.NewValue)
{
element.RenderTransform = new TranslateTransform(0, 0);
element.PreviewMouseDown += element_PreviewMouseDown;
element.PreviewMouseUp += element_PreviewMouseUp;
}
else
{
element.PreviewMouseDown -= element_PreviewMouseDown;
element.PreviewMouseUp -= element_PreviewMouseUp;
}
}
}
#endregion
}
}
728x90
▶ MainWindow.xaml
<Window x:Class="TestProject.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="800"
Height="600"
Title="Canvas 클래스 : 자식 엘리먼트 드래그하기"
FontFamily="나눔고딕코딩"
FontSize="16">
<Canvas>
<Image Name="image1" Canvas.Left="50" Canvas.Top="50"
Width="200"
Height="150"
Stretch="Fill"
Source="IMAGE/sample1.png" />
<Image Name="image2" Canvas.Left="50" Canvas.Top="210"
Width="200"
Height="150"
Stretch="Fill"
Source="IMAGE/sample2.png" />
<Button Name="button" Canvas.Left="300" Canvas.Top="50"
Width="100"
Height="30"
Content="Test" />
<TextBlock Name="textBlock" Canvas.Left="300" Canvas.Top="210"
Width="200"
Text="TEXT BLOCK" />
</Canvas>
</Window>
300x250
▶ MainWindow.xaml.cs
using System.Windows;
namespace TestProject
{
/// <summary>
/// 메인 윈도우
/// </summary>
public partial class MainWindow : Window
{
//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
////////////////////////////////////////////////////////////////////////////////////////// Public
#region 생성자 - MainWindow()
/// <summary>
/// 생성자
/// </summary>
public MainWindow()
{
InitializeComponent();
Loaded += Window_Loaded;
}
#endregion
//////////////////////////////////////////////////////////////////////////////////////////////////// Method
////////////////////////////////////////////////////////////////////////////////////////// Private
#region 윈도우 로드시 처리하기 - Window_Loaded(sender, e)
/// <summary>
/// 윈도우 로드시 처리하기
/// </summary>
/// <param name="sender">이벤트 발생자</param>
/// <param name="e">이벤트 인자</param>
private void Window_Loaded(object sender, RoutedEventArgs e)
{
DragHelper.SetWindow(this);
DragHelper.SetDrag(this.image1 , true);
DragHelper.SetDrag(this.image2 , true);
DragHelper.SetDrag(this.button , true);
DragHelper.SetDrag(this.textBlock, true);
}
#endregion
}
}728x90
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