84 lines
2.5 KiB
C#
84 lines
2.5 KiB
C#
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using System.Diagnostics;
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using System.Reflection;
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using System.Windows.Controls;
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namespace WPFluent.Controls;
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/// <summary>
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/// Extends <see cref="System.Windows.Controls.GridViewHeaderRowPresenter"/>, and adds layout support for <see
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/// cref="GridViewColumn"/>, which can have <see cref="GridViewColumn.MinWidth"/> and <see
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/// cref="GridViewColumn.MaxWidth"/>.
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/// </summary>
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public class GridViewHeaderRowPresenter : System.Windows.Controls.GridViewHeaderRowPresenter
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{
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public GridViewHeaderRowPresenter() { Loaded += OnLoaded; }
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private void OnLoaded(object sender, RoutedEventArgs e) { UpdateIndicatorStyle(); }
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private void UpdateIndicatorStyle()
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{
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FieldInfo? indicatorField = typeof(System.Windows.Controls.GridViewHeaderRowPresenter).GetField(
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"_indicator",
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BindingFlags.NonPublic | BindingFlags.Instance);
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if (indicatorField == null)
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{
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Debug.WriteLine("Failed to get the _indicator field");
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return;
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}
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if (indicatorField.GetValue(this) is Separator indicator)
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{
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indicator.Margin = new Thickness(0);
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indicator.Width = 3.0;
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ResourceDictionary resourceDictionary = new()
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{
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Source =
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new Uri(
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"pack://application:,,,/WPFluent;component/Controls/GridView/GridViewHeaderRowIndicator.xaml",
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UriKind.Absolute),
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};
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if (resourceDictionary["GridViewHeaderRowIndicatorTemplate"] is ControlTemplate template)
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{
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indicator.Template = template;
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}
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else
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{
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Debug.WriteLine("Failed to get the GridViewHeaderRowIndicatorTemplate");
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}
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}
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}
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protected override Size ArrangeOverride(Size arrangeSize)
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{
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// update the desired width of each column (clamps desiredwidth to MinWidth and MaxWidth)
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if (Columns != null)
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{
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foreach (GridViewColumn column in Columns.OfType<GridViewColumn>())
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{
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column.UpdateDesiredWidth();
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}
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}
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return base.ArrangeOverride(arrangeSize);
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}
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protected override Size MeasureOverride(Size constraint)
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{
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if (Columns != null)
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{
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foreach (GridViewColumn column in Columns.OfType<GridViewColumn>())
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{
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column.UpdateDesiredWidth();
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}
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}
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return base.MeasureOverride(constraint);
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}
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}
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