using System;
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using System.ComponentModel;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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namespace Bro.Common.ImageCanvas
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{
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public class ZoomAndPanScrollViewer : ScrollViewer
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{
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public Action<Point> OnMousePositionChanged { get; set; }
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// private ZoomAndPanControl _zoomAndPanControl;
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#region constructor and overrides
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/// <summary>
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/// Static constructor to define metadata for the control (and link it to the style in Generic.xaml).
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/// </summary>
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static ZoomAndPanScrollViewer()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(ZoomAndPanScrollViewer), new FrameworkPropertyMetadata(typeof(ZoomAndPanScrollViewer)));
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}
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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ZoomAndPanContent = Template.FindName("PART_ZoomAndPanControl", this) as ZoomAndPanControl;
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OnPropertyChanged(new DependencyPropertyChangedEventArgs(ZoomAndPanContentProperty, null, ZoomAndPanContent));
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RefreshProperties();
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}
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#endregion
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/// <summary>
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/// Get/set the maximum value for 'ViewportZoom'.
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/// </summary>
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public ZoomAndPanControl ZoomAndPanContent
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{
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get { return (ZoomAndPanControl)GetValue(ZoomAndPanContentProperty); }
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set { SetValue(ZoomAndPanContentProperty, value); }
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}
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public static readonly DependencyProperty ZoomAndPanContentProperty = DependencyProperty.Register("ZoomAndPanContent",
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typeof(ZoomAndPanControl), typeof(ZoomAndPanScrollViewer), new FrameworkPropertyMetadata(null));
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#region DependencyProperties
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/// <summary>
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/// Get/set the maximum value for 'ViewportZoom'.
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/// </summary>
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public MinimumZoomTypeEnum MinimumZoomType
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{
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get { return (MinimumZoomTypeEnum)GetValue(MinimumZoomTypeProperty); }
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set { SetValue(MinimumZoomTypeProperty, value); }
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}
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public static readonly DependencyProperty MinimumZoomTypeProperty = DependencyProperty.Register("MinimumZoomType",
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typeof(MinimumZoomTypeEnum), typeof(ZoomAndPanScrollViewer), new FrameworkPropertyMetadata(MinimumZoomTypeEnum.MinimumZoom));
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/// <summary>
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/// Get/set the MinimumZoom value for 'ViewportZoom'.
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/// </summary>
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public Point? MousePosition
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{
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get { return (Point?)GetValue(MousePositionProperty); }
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set { SetValue(MousePositionProperty, value); }
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}
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public static readonly DependencyProperty MousePositionProperty = DependencyProperty.Register("MousePosition",
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typeof(Point?), typeof(ZoomAndPanScrollViewer), new PropertyMetadata(null, OnMousePointPropertyChanged));
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private static void OnMousePointPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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ZoomAndPanScrollViewer ctrl = d as ZoomAndPanScrollViewer;
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if (ctrl != null)
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{
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Point? p = (Point?)e.NewValue;
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if (p != null)
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{
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ctrl.OnMousePositionChanged?.BeginInvoke(p.Value, null, null);
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}
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}
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}
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/// <summary>
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/// Disables animations if set to false
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/// </summary>
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public bool UseAnimations
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{
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get { return (bool)GetValue(UseAnimationsProperty); }
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set { SetValue(UseAnimationsProperty, value); }
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}
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public static readonly DependencyProperty UseAnimationsProperty = DependencyProperty.Register("UseAnimations",
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typeof(bool), typeof(ZoomAndPanScrollViewer), new FrameworkPropertyMetadata(true));
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/// <summary>
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/// Get/set the current scale (or zoom factor) of the content.
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/// </summary>
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public double ViewportZoom
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{
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get { return (double)GetValue(ViewportZoomProperty); }
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set { SetValue(ViewportZoomProperty, value); }
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}
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public static readonly DependencyProperty ViewportZoomProperty = DependencyProperty.Register("ViewportZoom",
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typeof(double), typeof(ZoomAndPanScrollViewer), new FrameworkPropertyMetadata(1.0));
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/// <summary>
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/// The duration of the animations (in seconds) started by calling AnimatedZoomTo and the other animation methods.
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/// </summary>
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public ZoomAndPanInitialPositionEnum ZoomAndPanInitialPosition
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{
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get { return (ZoomAndPanInitialPositionEnum)GetValue(ZoomAndPanInitialPositionProperty); }
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set { SetValue(ZoomAndPanInitialPositionProperty, value); }
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}
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public static readonly DependencyProperty ZoomAndPanInitialPositionProperty = DependencyProperty.Register("ZoomAndPanInitialPosition",
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typeof(ZoomAndPanInitialPositionEnum), typeof(ZoomAndPanScrollViewer), new FrameworkPropertyMetadata(ZoomAndPanInitialPositionEnum.Default));
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#endregion
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#region Commands
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/// <summary>
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/// Command to implement the zoom to fill
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/// </summary>
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public ICommand FillCommand => _fillCommand ?? (_fillCommand =
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new RelayCommand(
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() => ZoomAndPanContent.FillCommand.Execute(null),
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() => ZoomAndPanContent?.FillCommand.CanExecute(null) ?? true));
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private RelayCommand _fillCommand;
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/// <summary>
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/// Command to implement the zoom to fit
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/// </summary>
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public ICommand FitCommand => _fitCommand ?? (_fitCommand =
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new RelayCommand(
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() => ZoomAndPanContent.FitCommand.Execute(null),
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() => ZoomAndPanContent?.FitCommand.CanExecute(null) ?? true));
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private RelayCommand _fitCommand;
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/// <summary>
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/// Command to implement the zoom to 100%
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/// </summary>
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public ICommand ZoomPercentCommand => _zoomPercentCommand ?? (_zoomPercentCommand =
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new RelayCommand<double>(
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value => ZoomAndPanContent.ZoomPercentCommand.Execute(value),
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value => ZoomAndPanContent?.ZoomPercentCommand.CanExecute(value) ?? true));
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private RelayCommand<double> _zoomPercentCommand;
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/// <summary>
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/// Command to implement the zoom to 100%
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/// </summary>
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public ICommand ZoomRatioFromMinimumCommand => _zoomRatioFromMinimumCommand ?? (_zoomRatioFromMinimumCommand =
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new RelayCommand<double>(
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value => ZoomAndPanContent.ZoomRatioFromMinimumCommand.Execute(value),
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value => ZoomAndPanContent?.ZoomRatioFromMinimumCommand.CanExecute(value) ?? true));
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private RelayCommand<double> _zoomRatioFromMinimumCommand;
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/// <summary>
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/// Command to implement the zoom out by 110%
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/// </summary>
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public ICommand ZoomOutCommand => _zoomOutCommand ?? (_zoomOutCommand =
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new RelayCommand(
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() => ZoomAndPanContent.ZoomOutCommand.Execute(null),
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() => ZoomAndPanContent?.ZoomOutCommand.CanExecute(null) ?? true));
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private RelayCommand _zoomOutCommand;
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/// <summary>
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/// Command to implement the zoom in by 91%
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/// </summary>
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public ICommand ZoomInCommand => _zoomInCommand ?? (_zoomInCommand =
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new RelayCommand(
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() => ZoomAndPanContent.ZoomInCommand.Execute(null),
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() => ZoomAndPanContent?.ZoomInCommand.CanExecute(null) ?? true));
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private RelayCommand _zoomInCommand;
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/// <summary>
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/// Command to implement Undo
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/// </summary>
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public ICommand UndoZoomCommand => _undoZoomCommand ?? (_undoZoomCommand =
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new RelayCommand(
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() => ZoomAndPanContent.UndoZoomCommand.Execute(null),
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() => ZoomAndPanContent?.UndoZoomCommand.CanExecute(null) ?? true));
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private RelayCommand _undoZoomCommand;
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/// <summary>
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/// Command to implement Redo
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/// </summary>
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public ICommand RedoZoomCommand => _redoZoomCommand ?? (_redoZoomCommand =
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new RelayCommand(
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() => ZoomAndPanContent.RedoZoomCommand.Execute(null),
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() => ZoomAndPanContent?.RedoZoomCommand.CanExecute(null) ?? true));
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private RelayCommand _redoZoomCommand;
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#endregion
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private void RefreshProperties()
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(FillCommand)));
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(FitCommand)));
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ZoomPercentCommand)));
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ZoomRatioFromMinimumCommand)));
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ZoomInCommand)));
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ZoomOutCommand)));
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(UndoZoomCommand)));
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(RedoZoomCommand)));
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}
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public event PropertyChangedEventHandler PropertyChanged;
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}
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}
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