■ Control 클래스를 사용해 확대/축소/이동 컨트롤을 만드는 방법을 보여준다.
▶ ControlDictionary.xaml
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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:TestProject"> <Style TargetType="{x:Type local:ZoomableCanvas}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type local:ZoomableCanvas}"> <Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}"> <Canvas Name="PART_Canvas" Width="{TemplateBinding CanvasWidth}" Height="{TemplateBinding CanvasHeight}" Background="LightGray"> </Canvas> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary> |
▶ MainApplication.xaml
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<Application x:Class="TestProject.MainApplication" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="MainWindow.xaml"> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="ControlDictionary.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> </Application> |
▶ MainWindow.xaml
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<Window x:Class="TestProject.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:TestProject" Width="800" Height="600" Title="TestProject" FontFamily="나눔고딕코딩" FontSize="16"> <local:ZoomableCanvas Margin="10" Background="LightYellow" CanvasWidth="500" CanvasHeight="400" ClipToBounds="True" /> </Window> |
▶ ZoomableCanvas.cs
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using System.Windows; using System.Windows.Controls; using System.Windows.Input; using System.Windows.Media; namespace TestProject; /// <summary> /// 확대/축소 컨트롤 /// </summary> public class ZoomableCanvas : Control { //////////////////////////////////////////////////////////////////////////////////////////////////// Dependency Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 캔버스 너비 속성 - CanvasWidthProperty /// <summary> /// 캔버스 너비 속성 /// </summary> public static readonly DependencyProperty CanvasWidthProperty = DependencyProperty.Register ( "CanvasWidth", typeof(double), typeof(ZoomableCanvas), new PropertyMetadata(300.0, CanvasSizePropertyChangedCallback) ); #endregion #region 캔버스 높이 속성 - CanvasHeightProperty /// <summary> /// 캔버스 높이 속성 /// </summary> public static readonly DependencyProperty CanvasHeightProperty = DependencyProperty.Register ( "CanvasHeight", typeof(double), typeof(ZoomableCanvas), new PropertyMetadata(200.0, CanvasSizePropertyChangedCallback) ); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 캔버스 너비 - CanvasWidth /// <summary> /// 캔버스 너비 /// </summary> public double CanvasWidth { get => (double)GetValue(CanvasWidthProperty); set => SetValue(CanvasWidthProperty, value); } #endregion #region 캔버스 높이 - CanvasHeight /// <summary> /// 캔버스 높이 /// </summary> public double CanvasHeight { get => (double)GetValue(CanvasHeightProperty); set => SetValue(CanvasHeightProperty, value); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 캔버스 /// </summary> private Canvas canvas; /// <summary> /// 스케일 변환 /// </summary> private ScaleTransform scaleTransform; /// <summary> /// 이동 변환 /// </summary> private TranslateTransform translateTransform; /// <summary> /// 시작 포인트 /// </summary> private Point startPoint; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Static #region 생성자 - ZoomableCanvas() /// <summary> /// 생성자 /// </summary> static ZoomableCanvas() { DefaultStyleKeyProperty.OverrideMetadata(typeof(ZoomableCanvas), new FrameworkPropertyMetadata(typeof(ZoomableCanvas))); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 캔버스 크기 속성 변경시 콜백 처리하기 - CanvasSizePropertyChangedCallback(d, e) /// <summary> /// 캔버스 크기 속성 변경시 콜백 처리하기 /// </summary> /// <param name="d">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private static void CanvasSizePropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e) { ZoomableCanvas zoomableCanvas = d as ZoomableCanvas; if(zoomableCanvas != null && zoomableCanvas.canvas != null) { zoomableCanvas.canvas.Width = zoomableCanvas.CanvasWidth; zoomableCanvas.canvas.Height = zoomableCanvas.CanvasHeight; } } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// Public #region 템플리트 적용시 처리하기 - OnApplyTemplate() /// <summary> /// 템플리트 적용시 처리하기 /// </summary> public override void OnApplyTemplate() { base.OnApplyTemplate(); this.canvas = GetTemplateChild("PART_Canvas") as Canvas; if(this.canvas != null) { this.scaleTransform = new ScaleTransform(); this.translateTransform = new TranslateTransform(); TransformGroup transformGroup = new TransformGroup(); transformGroup.Children.Add(this.scaleTransform ); transformGroup.Children.Add(this.translateTransform); this.canvas.RenderTransformOrigin = new Point(0.5, 0.5); this.canvas.RenderTransform = transformGroup; } } #endregion //////////////////////////////////////////////////////////////////////////////// Protected #region 마우스 휠 처리하기 - OnMouseWheel(e) /// <summary> /// 마우스 휠 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnMouseWheel(MouseWheelEventArgs e) { base.OnMouseWheel(e); if(this.canvas == null) { return; } double zoom = e.Delta > 0 ? 1.1 : 0.9; Point mousePoition = e.GetPosition(this.canvas); this.scaleTransform.ScaleX *= zoom; this.scaleTransform.ScaleY *= zoom; this.translateTransform.X += (1 - zoom) * mousePoition.X; this.translateTransform.Y += (1 - zoom) * mousePoition.Y; } #endregion #region 마우스 왼쪽 버튼 DOWN 처리하기 - OnMouseLeftButtonDown(e) /// <summary> /// 마우스 왼쪽 버튼 DOWN 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e) { base.OnMouseLeftButtonDown(e); this.startPoint = e.GetPosition(this); CaptureMouse(); } #endregion #region 마우스 이동시 처리하기 - OnMouseMove(e) /// <summary> /// 마우스 이동시 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if(IsMouseCaptured) { Point currentPoint = e.GetPosition(this); Vector deltaVector = currentPoint - this.startPoint; this.translateTransform.X += deltaVector.X; this.translateTransform.Y += deltaVector.Y; this.startPoint = currentPoint; } } #endregion #region 마우스 왼쪽 버튼 UP 처리하기 - OnMouseLeftButtonUp(e) /// <summary> /// 마우스 왼쪽 버튼 UP 처리하기 /// </summary> /// <param name="e">이벤트 인자</param> protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e) { base.OnMouseLeftButtonUp(e); ReleaseMouseCapture(); } #endregion } |
