├── AvaloniaAccordion.sln ├── AvaloniaAccordion ├── Accordion.axaml ├── Accordion.axaml.cs ├── Accordion.properties.cs ├── AvaloniaAccordion.csproj └── Converters.cs ├── LICENSE ├── Readme.md ├── TestAccordion ├── App.axaml ├── App.axaml.cs ├── MainWindow.axaml ├── MainWindow.axaml.cs ├── Program.cs └── TestAccordion.csproj ├── icon.png ├── icon.svg └── screenshot.png /AvaloniaAccordion.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.31005.135 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TestAccordion", "TestAccordion\TestAccordion.csproj", "{B008BCFF-0915-4EFA-AAD6-A69F8AC4E08D}" 7 | EndProject 8 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AvaloniaAccordion", "AvaloniaAccordion\AvaloniaAccordion.csproj", "{A3FB540B-FF11-4C47-8AB6-1582FAE90A0E}" 9 | EndProject 10 | Global 11 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 12 | Debug|Any CPU = Debug|Any CPU 13 | Release|Any CPU = Release|Any CPU 14 | EndGlobalSection 15 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 16 | {B008BCFF-0915-4EFA-AAD6-A69F8AC4E08D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 17 | {B008BCFF-0915-4EFA-AAD6-A69F8AC4E08D}.Debug|Any CPU.Build.0 = Debug|Any CPU 18 | {B008BCFF-0915-4EFA-AAD6-A69F8AC4E08D}.Release|Any CPU.ActiveCfg = Release|Any CPU 19 | {B008BCFF-0915-4EFA-AAD6-A69F8AC4E08D}.Release|Any CPU.Build.0 = Release|Any CPU 20 | {A3FB540B-FF11-4C47-8AB6-1582FAE90A0E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 21 | {A3FB540B-FF11-4C47-8AB6-1582FAE90A0E}.Debug|Any CPU.Build.0 = Debug|Any CPU 22 | {A3FB540B-FF11-4C47-8AB6-1582FAE90A0E}.Release|Any CPU.ActiveCfg = Release|Any CPU 23 | {A3FB540B-FF11-4C47-8AB6-1582FAE90A0E}.Release|Any CPU.Build.0 = Release|Any CPU 24 | EndGlobalSection 25 | GlobalSection(SolutionProperties) = preSolution 26 | HideSolutionNode = FALSE 27 | EndGlobalSection 28 | GlobalSection(ExtensibilityGlobals) = postSolution 29 | SolutionGuid = {7C612F9E-A21E-4798-874F-4A119ADF7D5B} 30 | EndGlobalSection 31 | EndGlobal 32 | -------------------------------------------------------------------------------- /AvaloniaAccordion/Accordion.axaml: -------------------------------------------------------------------------------- 1 | 15 | 16 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 32 | 33 | 36 | 37 | 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 | -------------------------------------------------------------------------------- /AvaloniaAccordion/Accordion.axaml.cs: -------------------------------------------------------------------------------- 1 | /* 2 | AvaloniaAccordion - An accordion-like expandable control for Avalonia. 3 | Copyright (C) 2021 Giorgio Bianchini 4 | 5 | This program is free software: you can redistribute it and/or modify 6 | it under the terms of the GNU General Public License as published by 7 | the Free Software Foundation, version 3. 8 | This program is distributed in the hope that it will be useful, 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 | GNU General Public License for more details. 12 | You should have received a copy of the GNU General Public License 13 | along with this program. If not, see . 14 | */ 15 | 16 | using Avalonia; 17 | using Avalonia.Controls; 18 | using Avalonia.Controls.Shapes; 19 | using Avalonia.Markup.Xaml; 20 | using Avalonia.Media; 21 | using Avalonia.VisualTree; 22 | using System; 23 | 24 | namespace AvaloniaAccordion 25 | { 26 | public partial class Accordion : UserControl 27 | { 28 | /// 29 | /// If the accordion is open, forces a recomputation of the height to make sure that all the contents fit. 30 | /// 31 | public void InvalidateHeight() 32 | { 33 | if (this.IsOpen) 34 | { 35 | AccordionHeightConverter.ReturnLastValue = true; 36 | AccordionAngleConverter.ReturnLastValue = true; 37 | this.IsOpen = false; 38 | 39 | _ = Avalonia.Threading.Dispatcher.UIThread.InvokeAsync(async () => 40 | { 41 | AccordionHeightConverter.ReturnLastValue = false; 42 | AccordionAngleConverter.ReturnLastValue = false; 43 | this.IsOpen = true; 44 | 45 | Accordion parentAccordion = this.FindAncestorOfType(); 46 | 47 | if (parentAccordion != null) 48 | { 49 | await System.Threading.Tasks.Task.Delay(TimeSpan.FromMilliseconds(Math.Max(10, this.TransitionDuration.TotalMilliseconds * 2))); 50 | parentAccordion.InvalidateHeight(); 51 | await System.Threading.Tasks.Task.Delay(TimeSpan.FromMilliseconds(Math.Max(10, this.TransitionDuration.TotalMilliseconds))); 52 | parentAccordion.InvalidateHeight(); 53 | } 54 | 55 | }, Avalonia.Threading.DispatcherPriority.MinValue); 56 | } 57 | } 58 | 59 | 60 | private Grid ContentGridParent; 61 | private AccordionHeightConverter AccordionHeightConverter; 62 | private AccordionAngleConverter AccordionAngleConverter; 63 | 64 | /// 65 | protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change) 66 | { 67 | base.OnPropertyChanged(change); 68 | 69 | if (change.Property == Accordion.TransitionDurationProperty) 70 | { 71 | if (ContentGridParent != null) 72 | { 73 | ((Avalonia.Animation.DoubleTransition)ContentGridParent.Transitions[0]).Duration = change.NewValue.GetValueOrDefault(); 74 | 75 | ((Avalonia.Animation.DoubleTransition)((RotateTransform)this.FindControl("ArrowPathLeft").RenderTransform).Transitions[0]).Duration = change.NewValue.GetValueOrDefault(); 76 | ((Avalonia.Animation.DoubleTransition)((RotateTransform)this.FindControl("ArrowPathRight").RenderTransform).Transitions[0]).Duration = change.NewValue.GetValueOrDefault(); 77 | } 78 | } 79 | else if (change.Property == Accordion.AccordionContentProperty) 80 | { 81 | this.InvalidateHeight(); 82 | } 83 | else if (change.Property == Accordion.BottomBarThicknessProperty) 84 | { 85 | if (this.IsOpen) 86 | { 87 | this.FindControl("BottomCanvas").RenderTransform = null; 88 | } 89 | else 90 | { 91 | this.FindControl("BottomCanvas").RenderTransform = new TranslateTransform(0, -change.NewValue.GetValueOrDefault()); 92 | } 93 | } 94 | else if (change.Property == Accordion.IsOpenProperty) 95 | { 96 | if (change.NewValue.GetValueOrDefault()) 97 | { 98 | this.FindControl("BottomCanvas").RenderTransform = null; 99 | } 100 | else 101 | { 102 | this.FindControl("BottomCanvas").RenderTransform = new TranslateTransform(0, -this.BottomBarThickness); 103 | } 104 | 105 | Avalonia.Threading.Dispatcher.UIThread.InvokeAsync(async () => 106 | { 107 | Accordion parentAccordion = this.FindAncestorOfType(); 108 | 109 | if (parentAccordion != null) 110 | { 111 | await System.Threading.Tasks.Task.Delay(TimeSpan.FromMilliseconds(Math.Max(10, this.TransitionDuration.TotalMilliseconds * 2))); 112 | parentAccordion.InvalidateHeight(); 113 | await System.Threading.Tasks.Task.Delay(TimeSpan.FromMilliseconds(Math.Max(10, this.TransitionDuration.TotalMilliseconds))); 114 | parentAccordion.InvalidateHeight(); 115 | } 116 | }); 117 | } 118 | } 119 | 120 | /// 121 | /// Creates a new instance. 122 | /// 123 | public Accordion() 124 | { 125 | InitializeComponent(); 126 | } 127 | 128 | private void InitializeComponent() 129 | { 130 | AvaloniaXamlLoader.Load(this); 131 | 132 | this.FindControl("BottomCanvas").RenderTransform = new TranslateTransform(0, -this.BottomBarThickness); 133 | 134 | this.AccordionHeightConverter = ((AccordionHeightConverter)this.FindResource("AccordionHeightConverter")); 135 | 136 | AccordionHeightConverter.ContentGrid = this.FindControl("ContentGrid"); 137 | 138 | this.AccordionAngleConverter = ((AccordionAngleConverter)this.FindResource("AccordionAngleConverter")); 139 | 140 | this.ContentGridParent = this.FindControl("ContentGridParent"); 141 | 142 | ((Avalonia.Animation.DoubleTransition)ContentGridParent.Transitions[0]).Duration = this.TransitionDuration; 143 | ((Avalonia.Animation.DoubleTransition)((RotateTransform)this.FindControl("ArrowPathLeft").RenderTransform).Transitions[0]).Duration = this.TransitionDuration; 144 | ((Avalonia.Animation.DoubleTransition)((RotateTransform)this.FindControl("ArrowPathRight").RenderTransform).Transitions[0]).Duration = this.TransitionDuration; 145 | 146 | this.FindControl("HeaderGrid").PointerPressed += (s, e) => 147 | { 148 | this.FindControl("HeaderGrid").Classes.Add("Pressed"); 149 | }; 150 | 151 | this.FindControl("HeaderGrid").PointerCaptureLost += (s, e) => 152 | { 153 | this.FindControl("HeaderGrid").Classes.Remove("Pressed"); 154 | }; 155 | 156 | this.FindControl("HeaderGrid").PointerReleased += (s, e) => 157 | { 158 | this.FindControl("HeaderGrid").Classes.Remove("Pressed"); 159 | 160 | this.IsOpen = !this.IsOpen; 161 | }; 162 | } 163 | } 164 | } 165 | -------------------------------------------------------------------------------- /AvaloniaAccordion/Accordion.properties.cs: -------------------------------------------------------------------------------- 1 | /* 2 | AvaloniaAccordion - An accordion-like expandable control for Avalonia. 3 | Copyright (C) 2021 Giorgio Bianchini 4 | 5 | This program is free software: you can redistribute it and/or modify 6 | it under the terms of the GNU General Public License as published by 7 | the Free Software Foundation, version 3. 8 | This program is distributed in the hope that it will be useful, 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 | GNU General Public License for more details. 12 | You should have received a copy of the GNU General Public License 13 | along with this program. If not, see . 14 | */ 15 | 16 | using Avalonia; 17 | using Avalonia.Media; 18 | using System; 19 | 20 | namespace AvaloniaAccordion 21 | { 22 | /// 23 | /// Represents an accordion-like expandable control. 24 | /// 25 | public partial class Accordion 26 | { 27 | /// 28 | /// Defines the property. 29 | /// 30 | public static readonly StyledProperty IsOpenProperty = AvaloniaProperty.Register(nameof(IsOpen), false); 31 | 32 | /// 33 | /// Determines whether the is open or closed. 34 | /// 35 | public bool IsOpen 36 | { 37 | get => GetValue(IsOpenProperty); 38 | set => SetValue(IsOpenProperty, value); 39 | } 40 | 41 | /// 42 | /// Defines the property. 43 | /// 44 | public static readonly StyledProperty TransitionDurationProperty = AvaloniaProperty.Register(nameof(TransitionDuration), TimeSpan.FromMilliseconds(100)); 45 | 46 | /// 47 | /// Determines the length of the animation when the is opened or closed. 48 | /// 49 | public TimeSpan TransitionDuration 50 | { 51 | get => GetValue(TransitionDurationProperty); 52 | set => SetValue(TransitionDurationProperty, value); 53 | } 54 | 55 | /// 56 | /// Defines the property. 57 | /// 58 | public static readonly StyledProperty AccordionContentProperty = AvaloniaProperty.Register(nameof(AccordionContent), null); 59 | 60 | /// 61 | /// Determines the content of the . 62 | /// 63 | public object AccordionContent 64 | { 65 | get => GetValue(AccordionContentProperty); 66 | set => SetValue(AccordionContentProperty, value); 67 | } 68 | 69 | /// 70 | /// Defines the property. 71 | /// 72 | public static readonly StyledProperty AccordionHeaderProperty = AvaloniaProperty.Register(nameof(AccordionHeader), null); 73 | 74 | /// 75 | /// Determines the header of the . 76 | /// 77 | public object AccordionHeader 78 | { 79 | get => GetValue(AccordionHeaderProperty); 80 | set => SetValue(AccordionHeaderProperty, value); 81 | } 82 | 83 | /// 84 | /// Defines the property. 85 | /// 86 | public static readonly StyledProperty HeaderBackgroundProperty = AvaloniaProperty.Register(nameof(HeaderBackground), new SolidColorBrush(Color.FromRgb(0, 114, 178))); 87 | 88 | /// 89 | /// Determines the background colour of the header of the . 90 | /// 91 | public Brush HeaderBackground 92 | { 93 | get => GetValue(HeaderBackgroundProperty); 94 | set => SetValue(HeaderBackgroundProperty, value); 95 | } 96 | 97 | /// 98 | /// Defines the property. 99 | /// 100 | public static readonly StyledProperty HeaderHoverBackgroundProperty = AvaloniaProperty.Register(nameof(HeaderHoverBackground), new SolidColorBrush(Color.FromRgb(48, 129, 194))); 101 | 102 | /// 103 | /// Determines the background colour of the header of the when the mouse is over it. 104 | /// 105 | public Brush HeaderHoverBackground 106 | { 107 | get => GetValue(HeaderHoverBackgroundProperty); 108 | set => SetValue(HeaderHoverBackgroundProperty, value); 109 | } 110 | 111 | /// 112 | /// Defines the property. 113 | /// 114 | public static readonly StyledProperty HeaderPressedBackgroundProperty = AvaloniaProperty.Register(nameof(HeaderPressedBackground), new SolidColorBrush(Color.FromRgb(0, 94, 156))); 115 | 116 | /// 117 | /// Determines the background colour of the header of the when the mouse is over it. 118 | /// 119 | public Brush HeaderPressedBackground 120 | { 121 | get => GetValue(HeaderPressedBackgroundProperty); 122 | set => SetValue(HeaderPressedBackgroundProperty, value); 123 | } 124 | 125 | /// 126 | /// Defines the property. 127 | /// 128 | public static readonly StyledProperty BottomBarBrushProperty = AvaloniaProperty.Register(nameof(BottomBarBrush), new SolidColorBrush(Color.FromRgb(0, 114, 178))); 129 | 130 | /// 131 | /// Determines the colour of the bar shown at the bottom of the when it is open. 132 | /// 133 | public Brush BottomBarBrush 134 | { 135 | get => GetValue(BottomBarBrushProperty); 136 | set => SetValue(BottomBarBrushProperty, value); 137 | } 138 | 139 | /// 140 | /// Defines the property. 141 | /// 142 | public static readonly StyledProperty ContentBackgroundProperty = AvaloniaProperty.Register(nameof(ContentBackground), new SolidColorBrush(Color.FromRgb(240, 245, 255))); 143 | 144 | /// 145 | /// Determines the background colour of the content of the . 146 | /// 147 | public Brush ContentBackground 148 | { 149 | get => GetValue(ContentBackgroundProperty); 150 | set => SetValue(ContentBackgroundProperty, value); 151 | } 152 | 153 | /// 154 | /// Defines the property. 155 | /// 156 | public static readonly StyledProperty HeaderForegroundProperty = AvaloniaProperty.Register(nameof(HeaderForeground), new SolidColorBrush(Color.FromRgb(255, 255, 255))); 157 | 158 | /// 159 | /// Determines the background colour of the header of the . 160 | /// 161 | public Brush HeaderForeground 162 | { 163 | get => GetValue(HeaderForegroundProperty); 164 | set => SetValue(HeaderForegroundProperty, value); 165 | } 166 | 167 | /// 168 | /// Defines the property. 169 | /// 170 | public static readonly StyledProperty BottomBarThicknessProperty = AvaloniaProperty.Register(nameof(BottomBarThickness), 4); 171 | 172 | /// 173 | /// Determines the thickness of the bar shown at the bottom of the when it is open. 174 | /// 175 | public double BottomBarThickness 176 | { 177 | get => GetValue(BottomBarThicknessProperty); 178 | set => SetValue(BottomBarThicknessProperty, value); 179 | } 180 | 181 | /// 182 | /// Defines the property. 183 | /// 184 | public static readonly StyledProperty ArrowSizeProperty = AvaloniaProperty.Register(nameof(ArrowSize), 18); 185 | 186 | /// 187 | /// Determines the size of the arrow showing the status of the . 188 | /// 189 | public double ArrowSize 190 | { 191 | get => GetValue(ArrowSizeProperty); 192 | set => SetValue(ArrowSizeProperty, value); 193 | } 194 | 195 | /// 196 | /// The possible positions of the arrows in the accordion header. 197 | /// 198 | public enum ArrowPositions 199 | { 200 | /// 201 | /// No arrows are shown. 202 | /// 203 | Neither = 0b00, 204 | 205 | /// 206 | /// An arrow is shown on the left. 207 | /// 208 | Left = 0b01, 209 | 210 | /// 211 | /// An arrow is shown on the right. 212 | /// 213 | Right = 0b10, 214 | 215 | /// 216 | /// Arrows are shown both on the left and on the right of the accordion header. 217 | /// 218 | Both = 0b11 219 | } 220 | 221 | /// 222 | /// Defines the property. 223 | /// 224 | public static readonly StyledProperty ArrowPositionProperty = AvaloniaProperty.Register(nameof(ArrowPosition), ArrowPositions.Left); 225 | 226 | /// 227 | /// Determines the position of the arrow showing the status of the . 228 | /// 229 | public ArrowPositions ArrowPosition 230 | { 231 | get => GetValue(ArrowPositionProperty); 232 | set => SetValue(ArrowPositionProperty, value); 233 | } 234 | } 235 | } 236 | -------------------------------------------------------------------------------- /AvaloniaAccordion/AvaloniaAccordion.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | netstandard2.0 5 | 1.0.0 6 | 7 | Giorgio Bianchini 8 | true 9 | University of Bristol 10 | An accordion-like control for Avalonia. 11 | GPL-3.0-only 12 | https://github.com/arklumpus/AvaloniaAccordion 13 | icon.png 14 | 15 | 16 | 17 | 18 | true 19 | . 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | -------------------------------------------------------------------------------- /AvaloniaAccordion/Converters.cs: -------------------------------------------------------------------------------- 1 | /* 2 | AvaloniaAccordion - An accordion-like expandable control for Avalonia. 3 | Copyright (C) 2021 Giorgio Bianchini 4 | 5 | This program is free software: you can redistribute it and/or modify 6 | it under the terms of the GNU General Public License as published by 7 | the Free Software Foundation, version 3. 8 | This program is distributed in the hope that it will be useful, 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 | GNU General Public License for more details. 12 | You should have received a copy of the GNU General Public License 13 | along with this program. If not, see . 14 | */ 15 | 16 | using Avalonia.Data.Converters; 17 | using System; 18 | using System.Globalization; 19 | using Avalonia.Controls; 20 | 21 | namespace AvaloniaAccordion 22 | { 23 | /// 24 | /// Converts into s. 25 | /// 26 | public class AccordionArrowPositionConverter : IValueConverter 27 | { 28 | /// 29 | public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 30 | { 31 | if (value is Accordion.ArrowPositions pos && parameter is string s && int.TryParse(s, out int i)) 32 | { 33 | return (((int)pos) & i) != 0; 34 | } 35 | else 36 | { 37 | return false; 38 | } 39 | } 40 | 41 | /// 42 | public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 43 | { 44 | if (value is bool b && b) 45 | { 46 | return Accordion.ArrowPositions.Both; 47 | } 48 | else 49 | { 50 | return Accordion.ArrowPositions.Neither; 51 | } 52 | } 53 | } 54 | 55 | /// 56 | /// Converts the accordion status into an angle for the accordion arrows. 57 | /// 58 | public class AccordionAngleConverter : IValueConverter 59 | { 60 | internal bool ReturnLastValue { private get; set; } = false; 61 | 62 | private double LastValue = 0; 63 | 64 | /// 65 | public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 66 | { 67 | if (ReturnLastValue) 68 | { 69 | return LastValue; 70 | } 71 | 72 | if (value is bool b && b) 73 | { 74 | LastValue = 180; 75 | return 180; 76 | } 77 | else 78 | { 79 | LastValue = 0; 80 | return 0; 81 | } 82 | } 83 | 84 | /// 85 | public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 86 | { 87 | if (value is double d && d != 0) 88 | { 89 | return true; 90 | } 91 | else 92 | { 93 | return false; 94 | } 95 | } 96 | } 97 | 98 | 99 | /// 100 | /// Converts the accordion status into the height of the container. 101 | /// 102 | public class AccordionHeightConverter : IValueConverter 103 | { 104 | internal Grid ContentGrid { private get; set; } = null; 105 | internal bool ReturnLastValue { private get; set; } = false; 106 | 107 | private double LastValue = 0; 108 | 109 | /// 110 | public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 111 | { 112 | if (ReturnLastValue) 113 | { 114 | return LastValue; 115 | } 116 | 117 | if (value is bool b && b) 118 | { 119 | if (ContentGrid != null) 120 | { 121 | ContentGrid.Measure(new Avalonia.Size(ContentGrid.Bounds.Width, double.PositiveInfinity)); 122 | 123 | LastValue = ContentGrid.DesiredSize.Height; 124 | return LastValue; 125 | } 126 | else 127 | { 128 | LastValue = 0; 129 | return 0; 130 | } 131 | } 132 | else 133 | { 134 | LastValue = 0; 135 | return 0; 136 | } 137 | } 138 | 139 | /// 140 | public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 141 | { 142 | if (value is double d && d != 0) 143 | { 144 | return true; 145 | } 146 | else 147 | { 148 | return false; 149 | } 150 | } 151 | } 152 | } 153 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Readme.md: -------------------------------------------------------------------------------- 1 | # AvaloniaAccordion: an accordion-like expandable control for Avalonia 2 | 3 | 4 | 5 | **AvaloniaAccordion** is an "accordion" control for Avalonia. This control is similar to an `Expander`, in the sense that it can be in an "open" state, in which its contents are shown, or in a "closed" state, in which the contents are hidden and only the header is shown. 6 | 7 | The library contains a control, defined in the `AvaloniaAccordion.Accordion` class. It is released under the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.html) licence. 8 | 9 | 10 | 11 | ## Getting started 12 | 13 | The library targets .NET Standard 2.0, thus it can be used in projects that target .NET Standard 2.0+ and .NET Core 2.0+. 14 | 15 | To use the library in your project, you should install the [AvaloniaAccordion Nuget package](https://www.nuget.org/packages/AvaloniaAccordion/). 16 | 17 | This repository also contains a very simple demo project using the control. 18 | 19 | ## Usage 20 | 21 | You will need to add the relevant `using` directive (in C# code) or the XML namespace (in the XAML code). You can then add the control from the AvaloniaAccordion namespace. For example 22 | 23 | ```XAML 24 | 26 | ... 27 | 28 | ... 29 | 30 | ``` 31 | 32 | Look at the source code in the [MainWindow.xaml](https://github.com/arklumpus/AvaloniaAccordion/blob/main/TestAccordion/MainWindow.axaml) file to see more examples. 33 | 34 | ### `Accordion` control 35 | 36 | The main properties of the `Accordion` control are: 37 | 38 | * The `IsOpen` property, which (unsurprisingly) is `true` when the accordion is open and `false` when it is closed. This can be manually set to open/close the accordion from code. 39 | 40 | * The `TransitionDuration` property, which determines the duration of the animations that plays when the accordion is open. Set to `0` to have the accordion open/close instantly. 41 | 42 | * The `AccordionContent` property, which is used to specify the content of the accordion. Set this to an avalonia control (e.g. a `StackPanel` or a `Grid`). 43 | 44 | * The `AccordionHeader` property, which specifies the header of the accordion. Set this to an avalonia control (e.g. a `StackPanel` or a `Grid`). 45 | 46 | * `HeaderForegeround` specifies the colour of the arrows in the header. 47 | 48 | * `HeaderBackground` specifies the background brush of the header (at rest). 49 | 50 | * `HeaderHoverBackground` specifies the background brush of the header (when the mouse is hovering it). 51 | 52 | * `HeaderPressedBackground` specifies the background colour of the header (when the user is clicking on it). 53 | 54 | * `ContentBackground` determines the background colour of the part of the accordion that contains the `AccordionContent`. 55 | 56 | * `BottomBarBrush` specifies the brush used for the bar at the bottom of the accordion. 57 | 58 | * `BottomBarThickness` specifies the thickness of the bar at the bottom of the accordion. Set to `0` to hide the bar. 59 | 60 | * The `ArrowSize` property determines the size of the arrows in the header. 61 | 62 | * The `ArrowPosition` property determines the positon of the arrows in the header (i.e. to the left, to the right, neither or both). 63 | 64 | The control also has a public `InvalidateHeight` method; this method should be called every time that the height of the content of the accordion changes, so that the accordion is notified of this and can update its height to match the content. If you are using nested `Accordion`s, each one will automatically notify its first `Accordion` ancestor; otherwise, if you are using other kinds of controls that can change size, you need to manually invoke the method whenever the height changes. 65 | 66 | ## Source code 67 | 68 | The source code for the library is available in this repository. The repository contains code for the `AvaloniaAccordion` library project and the demo application. -------------------------------------------------------------------------------- /TestAccordion/App.axaml: -------------------------------------------------------------------------------- 1 | 4 | 5 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /TestAccordion/App.axaml.cs: -------------------------------------------------------------------------------- 1 | using Avalonia; 2 | using Avalonia.Controls.ApplicationLifetimes; 3 | using Avalonia.Markup.Xaml; 4 | 5 | namespace TestAccordion 6 | { 7 | public class App : Application 8 | { 9 | public override void Initialize() 10 | { 11 | AvaloniaXamlLoader.Load(this); 12 | } 13 | 14 | public override void OnFrameworkInitializationCompleted() 15 | { 16 | if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop) 17 | { 18 | desktop.MainWindow = new MainWindow(); 19 | } 20 | 21 | base.OnFrameworkInitializationCompleted(); 22 | } 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /TestAccordion/MainWindow.axaml: -------------------------------------------------------------------------------- 1 | 9 | 10 | 11 | 12 | 13 | 14 | This is an accordion control 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | CheckBox 23 | RadioButton 24 | 25 | TextBox 26 | 27 | 28 | 29 | 30 | 31 | 32 | This is a nested accordion control 33 | 34 | 35 | 36 | 37 | 38 | CheckBox 2 39 | RadioButton 2 40 | 41 | TextBox 2 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | -------------------------------------------------------------------------------- /TestAccordion/MainWindow.axaml.cs: -------------------------------------------------------------------------------- 1 | using Avalonia; 2 | using Avalonia.Controls; 3 | using Avalonia.Markup.Xaml; 4 | 5 | namespace TestAccordion 6 | { 7 | public partial class MainWindow : Window 8 | { 9 | public MainWindow() 10 | { 11 | InitializeComponent(); 12 | #if DEBUG 13 | this.AttachDevTools(); 14 | #endif 15 | } 16 | 17 | private void InitializeComponent() 18 | { 19 | AvaloniaXamlLoader.Load(this); 20 | } 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /TestAccordion/Program.cs: -------------------------------------------------------------------------------- 1 | using Avalonia; 2 | using Avalonia.Controls; 3 | using Avalonia.Controls.ApplicationLifetimes; 4 | using System; 5 | 6 | namespace TestAccordion 7 | { 8 | class Program 9 | { 10 | // Initialization code. Don't use any Avalonia, third-party APIs or any 11 | // SynchronizationContext-reliant code before AppMain is called: things aren't initialized 12 | // yet and stuff might break. 13 | public static void Main(string[] args) => BuildAvaloniaApp() 14 | .StartWithClassicDesktopLifetime(args); 15 | 16 | // Avalonia configuration, don't remove; also used by visual designer. 17 | public static AppBuilder BuildAvaloniaApp() 18 | => AppBuilder.Configure() 19 | .UsePlatformDetect() 20 | .LogToTrace(); 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /TestAccordion/TestAccordion.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | WinExe 4 | net5.0 5 | enable 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | -------------------------------------------------------------------------------- /icon.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/arklumpus/AvaloniaAccordion/2938a8647e63d56a31fe869adc579f61348f2175/icon.png -------------------------------------------------------------------------------- /icon.svg: -------------------------------------------------------------------------------- 1 | 2 | 20 | 22 | 45 | 47 | 48 | 50 | image/svg+xml 51 | 53 | 54 | 55 | 56 | 57 | 62 | 65 | 70 | 75 | 80 | 85 | 86 | 93 | 100 | 103 | 107 | 111 | 112 | 116 | 120 | 121 | 122 | 123 | 124 | -------------------------------------------------------------------------------- /screenshot.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/arklumpus/AvaloniaAccordion/2938a8647e63d56a31fe869adc579f61348f2175/screenshot.png --------------------------------------------------------------------------------