File size: 4,453 Bytes
8c763fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | // Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using System;
using System.Diagnostics.CodeAnalysis;
using System.Windows;
using System.Windows.Automation;
using System.Windows.Automation.Peers;
using System.Windows.Data;
using System.Windows.Media;
namespace Microsoft.Management.UI.Internal
{
/// <content>
/// Partial class implementation for ScalableImage control.
/// </content>
[SuppressMessage("Microsoft.MSInternal", "CA903:InternalNamespaceShouldNotContainPublicTypes")]
public partial class ScalableImage : FrameworkElement
{
#region Structors
/// <summary>
/// Initializes a new instance of the <see cref="Microsoft.Management.UI.Internal.ScalableImage" /> class.
/// </summary>
public ScalableImage()
{
// This constructor intentionally left blank
}
#endregion
#region Overrides
/// <summary>
/// Called when the control is asked to render itself in a given area.
/// Sets the render size to use all available area when <see cref="Microsoft.Management.UI.Internal.ScalableImageSource.Brush"/> is provided.
/// </summary>
/// <param name="finalSize">The final area within the parent that this element should use to arrange itself and its children.</param>
/// <returns>The actual size used to render the control.</returns>
protected override Size ArrangeOverride(Size finalSize)
{
// If a vector is provided, specify that the control will use all available area \\
if (this.Source != null && this.Source.Brush != null)
{
return finalSize;
}
return base.ArrangeOverride(finalSize);
}
/// <summary>
/// Called when the control is being rendered.
/// Renders the contents of the image as a vector or a bitmap, depending on which is provided.
/// </summary>
/// <param name="drawingContext">An instance of <see cref="System.Windows.Media.DrawingContext"/> used to render the control.</param>
protected override void OnRender(DrawingContext drawingContext)
{
Rect renderArea = new Rect(this.RenderSize);
// No source was provided \\
if (this.Source == null)
{
return;
}
// Prefer the vector if it's provided \\
if (this.Source.Brush != null)
{
drawingContext.DrawRectangle(this.Source.Brush, null, renderArea);
}
else if (this.Source.Image != null)
{
drawingContext.DrawImage(this.Source.Image, renderArea);
}
}
/// <summary>
/// Override of <see cref="UIElement.GetLayoutClip"/>.
/// Make this control to respect the ClipToBounds attribute value.
/// </summary>
/// <param name="layoutSlotSize">An instance of <see cref="System.Windows.Size"/> used for calculating an additional clip.</param>
/// <returns>Geometry to use as an additional clip in case when element is larger than available space.</returns>
protected override Geometry GetLayoutClip(Size layoutSlotSize)
{
return ClipToBounds ? base.GetLayoutClip(layoutSlotSize) : null;
}
#endregion
#region Protected Methods
partial void OnSourceChangedImplementation(PropertyChangedEventArgs<ScalableImageSource> e)
{
if (e.NewValue != null)
{
// If a width was provided in the source, use it now \\
if (!e.NewValue.Size.Width.Equals(double.NaN))
{
this.Width = e.NewValue.Size.Width;
}
// If a height was provided in the source, use it now \\
if (!e.NewValue.Size.Height.Equals(double.NaN))
{
this.Height = e.NewValue.Size.Height;
}
// Bind the image's accessible name to the one set in the source \\
Binding accessibleNameBinding = new Binding(ScalableImageSource.AccessibleNameProperty.Name);
accessibleNameBinding.Source = this.Source;
this.SetBinding(AutomationProperties.NameProperty, accessibleNameBinding);
}
}
#endregion
}
}
|