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[12503] | 1 | using System;
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| 2 | using System.Collections.Generic;
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| 3 | using System.Linq;
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| 4 | using System.Text;
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| 5 | using System.Windows;
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| 6 |
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| 7 | namespace Microsoft.Research.DynamicDataDisplay.ViewportConstraints
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| 8 | {
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| 9 | /// <summary>
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| 10 | /// Represents a constraint, which limits the maximal size of <see cref="Viewport"/>'s Visible property.
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| 11 | /// </summary>
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| 12 | public class MaximalSizeConstraint : ViewportConstraint
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| 13 | {
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| 14 | /// <summary>
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| 15 | /// Initializes a new instance of the <see cref="MaximalSizeConstraint"/> class.
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| 16 | /// </summary>
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| 17 | public MaximalSizeConstraint() { }
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| 18 |
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| 19 | /// <summary>
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| 20 | /// Initializes a new instance of the <see cref="MaximalSizeConstraint"/> class with the given maximal size of Viewport's Visible.
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| 21 | /// </summary>
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| 22 | /// <param name="maxSize">Maximal size of Viewport's Visible.</param>
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| 23 | public MaximalSizeConstraint(double maxSize)
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| 24 | {
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| 25 | MaxSize = maxSize;
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| 26 | }
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| 27 |
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| 28 | private double maxSize = 1000;
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| 29 | /// <summary>
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| 30 | /// Gets or sets the maximal size of Viewport's Visible.
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| 31 | /// The default value is 1000.0.
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| 32 | /// </summary>
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| 33 | /// <value>The size of the max.</value>
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| 34 | public double MaxSize
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| 35 | {
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| 36 | get { return maxSize; }
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| 37 | set
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| 38 | {
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| 39 | if (maxSize != value)
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| 40 | {
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| 41 | maxSize = value;
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| 42 | RaiseChanged();
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| 43 | }
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| 44 | }
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| 45 | }
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| 46 |
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| 47 | /// <summary>
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| 48 | /// Applies the specified old data rect.
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| 49 | /// </summary>
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| 50 | /// <param name="oldDataRect">The old data rect.</param>
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| 51 | /// <param name="newDataRect">The new data rect.</param>
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| 52 | /// <param name="viewport">The viewport.</param>
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| 53 | /// <returns></returns>
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| 54 | public override DataRect Apply(DataRect oldDataRect, DataRect newDataRect, Viewport2D viewport)
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| 55 | {
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| 56 | bool decreasing = newDataRect.Width < oldDataRect.Width || newDataRect.Height < oldDataRect.Height;
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| 57 | if (!decreasing && (newDataRect.Width > maxSize || newDataRect.Height > maxSize))
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| 58 | return oldDataRect;
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| 59 |
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| 60 | return newDataRect;
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| 61 | }
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| 62 | }
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| 63 | }
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