// <copyright file="ColumnChartCanvas.cs" company="Oleg V. Polikarpotchkin"> // Copyright © 2008-2009 Oleg V. Polikarpotchkin. // </copyright> // <author>Oleg V. Polikarpotchkin</author> // <email>ov-p@yandex.ru</email> // <date>2009-03-13</date> // <summary>Canvas for the ColumnChart Control.</summary> using System.Diagnostics; using System.Windows; using System.Windows.Controls; using OpenWPFChart.Parts; namespace OpenWPFChart.Controls { /// <summary> /// Canvas for the ColumnChart Control. /// </summary> /// <remarks> /// ColumnChartCanvas shifts its <see cref="OpenWPFChart.Parts.ColumnChartItemDataView"/>-based children by /// column width value. /// <para>ColumnChartCanvas sizes according to its contents.</para> /// </remarks> public class ColumnChartCanvas : Canvas { /// <summary> /// Invoked when the <see cref="T:System.Windows.Media.VisualCollection"/> of a visual object /// is modified. /// </summary> /// <param name="visualAdded">The <see cref="T:System.Windows.Media.Visual"/> that was added /// to the collection.</param> /// <param name="visualRemoved">The <see cref="T:System.Windows.Media.Visual"/> that was /// removed from the collection.</param> /// <remarks> /// This method offsets all <see cref="OpenWPFChart.Parts.ColumnChartItemDataView"/> panel items /// by setting their Canvas.Left property. /// </remarks> protected override void OnVisualChildrenChanged(DependencyObject visualAdded , DependencyObject visualRemoved) { double columnWidth = 0d; int visibleChildrenCount = 0; foreach (UIElement child in Children) { ColumnChartItemDataView itemDataView = findItemDataView(child); if (itemDataView == null) continue; if (visibleChildrenCount++ == 0) columnWidth = itemDataView.ColumnWidth; else { // All items should have the same ColumnWidth property value. Debug.Assert(columnWidth == itemDataView.ColumnWidth, "columnWidth == itemDataView.ColumnWidth"); } } if (visibleChildrenCount < 2) // Doesn't have to shift single item. return; double offset = -0.5 * columnWidth * (visibleChildrenCount - 1); foreach (UIElement child in Children) { if (findItemDataView(child) == null) continue; SetLeft(child, offset); offset += columnWidth; } } /// <summary> /// Finds the item data view. /// </summary> /// <remarks> /// </remarks> /// <param name="item">The <see cref="T:System.Windows.ItemsControl"/> item container.</param> /// <returns></returns> static ColumnChartItemDataView findItemDataView(UIElement item) { FrameworkElement fe = item as FrameworkElement; if (fe == null) return null; return fe.DataContext as ColumnChartItemDataView; } } }
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