98 lines
2.3 KiB
C#
98 lines
2.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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using System.Windows.Documents;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using System.Windows.Navigation;
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using System.Windows.Shapes;
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using System.Windows.Controls.Primitives;
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using Microsoft.Research.DynamicDataDisplay;
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namespace Microsoft.Research.DynamicDataDisplay.Charts.Shapes
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{
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/// <summary>
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/// Represents a simple draggable point with position bound to point in viewport coordinates, which allows to drag iself by mouse.
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/// </summary>
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public partial class DraggablePoint : PositionalViewportUIContainer
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="DraggablePoint"/> class.
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/// </summary>
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public DraggablePoint()
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{
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InitializeComponent();
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="DraggablePoint"/> class.
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/// </summary>
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/// <param name="position">The position of DraggablePoint.</param>
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public DraggablePoint(Point position) : this() { Position = position; }
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bool dragging = false;
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Point dragStart;
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Vector shift;
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protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
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{
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if (Plotter == null)
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return;
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dragStart = e.GetPosition(Plotter.ViewportPanel).ScreenToData(Plotter.Viewport.Transform);
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shift = Position - dragStart;
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dragging = true;
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}
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protected override void OnMouseLeave(MouseEventArgs e)
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{
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ReleaseMouseCapture();
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dragging = false;
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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if (!dragging)
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{
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if (IsMouseCaptured)
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ReleaseMouseCapture();
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return;
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}
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if (!IsMouseCaptured)
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CaptureMouse();
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Point mouseInData = e.GetPosition(Plotter.ViewportPanel).ScreenToData(Plotter.Viewport.Transform);
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if (mouseInData != dragStart)
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{
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Position = mouseInData + shift;
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e.Handled = true;
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}
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}
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protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
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{
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if (dragging)
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{
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dragging = false;
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if (IsMouseCaptured)
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{
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ReleaseMouseCapture();
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e.Handled = true;
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}
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}
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}
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protected override Size ArrangeOverride(Size arrangeBounds)
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{
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return base.ArrangeOverride(arrangeBounds);
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}
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}
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}
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