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Kevin Krüger
334
VideoBrowser/Controls/AdornedControl/FrameworkElementAdorner.cs
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334
VideoBrowser/Controls/AdornedControl/FrameworkElementAdorner.cs
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//
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// This code based on code available here:
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//
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// http://www.codeproject.com/KB/WPF/WPFJoshSmith.aspx
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//
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namespace VideoBrowser.Controls.AdornedControl
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{
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using System;
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using System.Collections;
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using System.Windows;
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using System.Windows.Documents;
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using System.Windows.Media;
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//
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// This class is an adorner that allows a FrameworkElement derived class to adorn another FrameworkElement.
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//
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public class FrameworkElementAdorner : Adorner
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{
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//
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// The framework element that is the adorner.
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//
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private FrameworkElement child;
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//
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// Placement of the child.
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//
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private readonly AdornerPlacement horizontalAdornerPlacement = AdornerPlacement.Inside;
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private readonly AdornerPlacement verticalAdornerPlacement = AdornerPlacement.Inside;
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//
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// Offset of the child.
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//
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private readonly double offsetX = 0.0;
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private readonly double offsetY = 0.0;
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//
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// Position of the child (when not set to NaN).
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//
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private double positionX = Double.NaN;
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private double positionY = Double.NaN;
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public FrameworkElementAdorner(FrameworkElement adornerChildElement, FrameworkElement adornedElement)
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: base(adornedElement)
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{
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this.child = adornerChildElement;
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base.AddLogicalChild(adornerChildElement);
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base.AddVisualChild(adornerChildElement);
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}
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public FrameworkElementAdorner(FrameworkElement adornerChildElement, FrameworkElement adornedElement,
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AdornerPlacement horizontalAdornerPlacement, AdornerPlacement verticalAdornerPlacement,
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double offsetX, double offsetY)
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: base(adornedElement)
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{
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this.child = adornerChildElement;
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this.horizontalAdornerPlacement = horizontalAdornerPlacement;
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this.verticalAdornerPlacement = verticalAdornerPlacement;
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this.offsetX = offsetX;
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this.offsetY = offsetY;
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adornedElement.SizeChanged += new SizeChangedEventHandler(adornedElement_SizeChanged);
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base.AddLogicalChild(adornerChildElement);
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base.AddVisualChild(adornerChildElement);
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}
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/// <summary>
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/// Event raised when the adorned control's size has changed.
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/// </summary>
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private void adornedElement_SizeChanged(object sender, SizeChangedEventArgs e)
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{
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InvalidateMeasure();
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}
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//
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// Position of the child (when not set to NaN).
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//
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public double PositionX
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{
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get
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{
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return positionX;
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}
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set
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{
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positionX = value;
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}
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}
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public double PositionY
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{
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get
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{
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return positionY;
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}
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set
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{
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positionY = value;
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}
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}
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protected override Size MeasureOverride(Size constraint)
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{
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this.child.Measure(constraint);
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return this.child.DesiredSize;
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}
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/// <summary>
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/// Determine the X coordinate of the child.
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/// </summary>
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private double DetermineX()
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{
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switch (child.HorizontalAlignment)
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{
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case HorizontalAlignment.Left:
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{
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if (horizontalAdornerPlacement == AdornerPlacement.Outside)
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{
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return -child.DesiredSize.Width + offsetX;
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}
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else
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{
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return offsetX;
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}
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}
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case HorizontalAlignment.Right:
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{
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if (horizontalAdornerPlacement == AdornerPlacement.Outside)
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{
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double adornedWidth = AdornedElement.ActualWidth;
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return adornedWidth + offsetX;
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}
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else
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{
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double adornerWidth = this.child.DesiredSize.Width;
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double adornedWidth = AdornedElement.ActualWidth;
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double x = adornedWidth - adornerWidth;
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return x + offsetX;
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}
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}
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case HorizontalAlignment.Center:
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{
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double adornerWidth = this.child.DesiredSize.Width;
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double adornedWidth = AdornedElement.ActualWidth;
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double x = (adornedWidth / 2) - (adornerWidth / 2);
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return x + offsetX;
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}
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case HorizontalAlignment.Stretch:
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{
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return 0.0;
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}
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}
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return 0.0;
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}
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/// <summary>
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/// Determine the Y coordinate of the child.
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/// </summary>
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private double DetermineY()
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{
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switch (child.VerticalAlignment)
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{
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case VerticalAlignment.Top:
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{
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if (verticalAdornerPlacement == AdornerPlacement.Outside)
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{
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return -child.DesiredSize.Height + offsetY;
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}
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else
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{
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return offsetY;
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}
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}
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case VerticalAlignment.Bottom:
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{
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if (verticalAdornerPlacement == AdornerPlacement.Outside)
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{
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double adornedHeight = AdornedElement.ActualHeight;
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return adornedHeight + offsetY;
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}
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else
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{
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double adornerHeight = this.child.DesiredSize.Height;
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double adornedHeight = AdornedElement.ActualHeight;
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double x = adornedHeight - adornerHeight;
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return x + offsetY;
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}
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}
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case VerticalAlignment.Center:
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{
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double adornerHeight = this.child.DesiredSize.Height;
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double adornedHeight = AdornedElement.ActualHeight;
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double x = (adornedHeight / 2) - (adornerHeight / 2);
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return x + offsetY;
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}
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case VerticalAlignment.Stretch:
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{
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return 0.0;
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}
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}
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return 0.0;
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}
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/// <summary>
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/// Determine the width of the child.
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/// </summary>
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private double DetermineWidth()
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{
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if (!Double.IsNaN(PositionX))
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{
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return this.child.DesiredSize.Width;
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}
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switch (child.HorizontalAlignment)
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{
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case HorizontalAlignment.Left:
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{
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return this.child.DesiredSize.Width;
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}
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case HorizontalAlignment.Right:
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{
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return this.child.DesiredSize.Width;
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}
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case HorizontalAlignment.Center:
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{
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return this.child.DesiredSize.Width;
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}
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case HorizontalAlignment.Stretch:
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{
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return AdornedElement.ActualWidth;
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}
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}
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return 0.0;
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}
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/// <summary>
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/// Determine the height of the child.
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/// </summary>
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private double DetermineHeight()
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{
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if (!Double.IsNaN(PositionY))
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{
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return this.child.DesiredSize.Height;
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}
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switch (child.VerticalAlignment)
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{
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case VerticalAlignment.Top:
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{
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return this.child.DesiredSize.Height;
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}
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case VerticalAlignment.Bottom:
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{
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return this.child.DesiredSize.Height;
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}
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case VerticalAlignment.Center:
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{
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return this.child.DesiredSize.Height;
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}
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case VerticalAlignment.Stretch:
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{
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return AdornedElement.ActualHeight;
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}
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}
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return 0.0;
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}
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protected override Size ArrangeOverride(Size finalSize)
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{
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double x = PositionX;
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if (Double.IsNaN(x))
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{
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x = DetermineX();
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}
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double y = PositionY;
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if (Double.IsNaN(y))
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{
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y = DetermineY();
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}
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double adornerWidth = DetermineWidth();
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double adornerHeight = DetermineHeight();
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this.child.Arrange(new Rect(x, y, adornerWidth, adornerHeight));
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return finalSize;
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}
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protected override Int32 VisualChildrenCount
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{
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get { return 1; }
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}
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protected override Visual GetVisualChild(Int32 index)
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{
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return this.child;
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}
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protected override IEnumerator LogicalChildren
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{
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get
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{
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ArrayList list = new ArrayList();
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list.Add(this.child);
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return list.GetEnumerator();
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}
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}
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/// <summary>
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/// Disconnect the child element from the visual tree so that it may be reused later.
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/// </summary>
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public void DisconnectChild()
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{
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base.RemoveLogicalChild(child);
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base.RemoveVisualChild(child);
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}
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/// <summary>
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/// Override AdornedElement from base class for less type-checking.
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/// </summary>
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public new FrameworkElement AdornedElement
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{
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get
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{
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return (FrameworkElement)base.AdornedElement;
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}
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}
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}
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}
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