Browse Source
* change visual brush for group box to grid * remove unused usings * Addressed review * cleanuppull/20953/head
Emmanuel Hansen
5 days ago
committed by
GitHub
GitHub
4 changed files with 233 additions and 108 deletions
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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using System; |
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using System.Collections.Generic; |
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using System.Globalization; |
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using Avalonia.Controls.Shapes; |
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using Avalonia.Data.Converters; |
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using Avalonia.Media; |
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namespace Avalonia.Controls.Converters |
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{ |
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// Ported from https://github.com/dotnet/wpf/blob/main/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Controls/BorderGapMaskConverter.cs
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/// <summary>
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/// Converter that generates the visual brush for <see cref="GroupBox"/>
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/// </summary>
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public class BorderGapMaskConverter : IMultiValueConverter |
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{ |
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/// <summary>
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/// Convert a value.
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/// </summary>
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/// <param name="values">values as produced by source binding</param>
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/// <param name="targetType">target type</param>
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/// <param name="parameter">converter parameter</param>
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/// <param name="culture">culture information</param>
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/// <returns>
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/// Converted value.
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/// Visual Brush that is used as the opacity mask for the Border
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/// in the style for GroupBox.
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/// </returns>
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public object? Convert(IList<object?> values, Type targetType, object? parameter, CultureInfo culture) |
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{ |
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//
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// Parameter Validation
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//
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if (parameter == null || |
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values == null || |
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values.Count != 3 || |
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values[0] is not double || |
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values[1] is not double || |
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values[2] is not double) |
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{ |
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return AvaloniaProperty.UnsetValue; |
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} |
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if (parameter is not double && parameter is not string) |
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{ |
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return AvaloniaProperty.UnsetValue; |
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} |
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//
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// Conversion
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//
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double? headerWidth = (double?)values[0]; |
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double? borderWidth = (double?)values[1]; |
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double? borderHeight = (double?)values[2]; |
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// Doesn't make sense to have a Grid
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// with 0 as width or height
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if (borderWidth == 0 |
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|| borderHeight == 0) |
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{ |
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return null; |
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} |
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// Width of the line to the left of the header
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// to be used to set the width of the first column of the Grid
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double lineWidth; |
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if (parameter is string) |
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{ |
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lineWidth = Double.Parse(((string)parameter), NumberFormatInfo.InvariantInfo); |
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} |
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else |
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{ |
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lineWidth = (double)parameter; |
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} |
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Grid grid = new Grid |
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{ |
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Width = borderWidth ?? 0, |
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Height = borderHeight ?? 0 |
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}; |
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ColumnDefinition colDef1 = new ColumnDefinition(); |
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ColumnDefinition colDef2 = new ColumnDefinition(); |
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ColumnDefinition colDef3 = new ColumnDefinition(); |
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colDef1.Width = new GridLength(lineWidth); |
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colDef2.Width = new GridLength(headerWidth ?? 0); |
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colDef3.Width = new GridLength(1, GridUnitType.Star); |
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grid.ColumnDefinitions.Add(colDef1); |
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grid.ColumnDefinitions.Add(colDef2); |
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grid.ColumnDefinitions.Add(colDef3); |
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RowDefinition rowDef1 = new RowDefinition(); |
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RowDefinition rowDef2 = new RowDefinition(); |
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rowDef1.Height = new GridLength((borderHeight ?? 0) / 2); |
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rowDef2.Height = new GridLength(1, GridUnitType.Star); |
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grid.RowDefinitions.Add(rowDef1); |
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grid.RowDefinitions.Add(rowDef2); |
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Rectangle rectColumn1 = new Rectangle(); |
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Rectangle rectColumn2 = new Rectangle(); |
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Rectangle rectColumn3 = new Rectangle(); |
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rectColumn1.Fill = Brushes.Black; |
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rectColumn2.Fill = Brushes.Black; |
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rectColumn3.Fill = Brushes.Black; |
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Grid.SetRowSpan(rectColumn1, 2); |
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Grid.SetRow(rectColumn1, 0); |
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Grid.SetColumn(rectColumn1, 0); |
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Grid.SetRow(rectColumn2, 1); |
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Grid.SetColumn(rectColumn2, 1); |
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Grid.SetRowSpan(rectColumn3, 2); |
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Grid.SetRow(rectColumn3, 0); |
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Grid.SetColumn(rectColumn3, 2); |
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grid.Children.Add(rectColumn1); |
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grid.Children.Add(rectColumn2); |
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grid.Children.Add(rectColumn3); |
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return (new VisualBrush(grid)); |
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} |
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} |
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} |
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