Avalonia/Perspex.Themes.Default/MenuItemStyle.cs

// -----------------------------------------------------------------------
// <copyright file="MenuItemStyle.cs" company="Steven Kirk">
// Copyright 2015 MIT Licence. See licence.md for more information.
// </copyright>
// -----------------------------------------------------------------------

namespace Perspex.Themes.Default
{
    using System.Linq;
    using Perspex.Controls;
    using Perspex.Controls.Presenters;
    using Perspex.Controls.Primitives;
    using Perspex.Controls.Shapes;
    using Perspex.Controls.Templates;
    using Perspex.Input;
    using Perspex.Layout;
    using Perspex.Media;
    using Perspex.Styling;

    public class MenuItemStyle : Styles
    {
        private static readonly DataTemplate AccessKeyDataTemplate =
            new DataTemplate<string>(x => new AccessText { Text = x });

        public MenuItemStyle()
        {
            this.AddRange(new[]
            {
                new Style(x => x.OfType<MenuItem>())
                {
                    Setters = new[]
                    {
                        new Setter(MenuItem.BorderThicknessProperty, 1.0),
                        new Setter(MenuItem.PaddingProperty, new Thickness(6, 0)),
                        new Setter(MenuItem.TemplateProperty, new ControlTemplate<MenuItem>(this.PopupTemplate)),
                    },
                },
                new Style(x => x.OfType<Menu>().Child().OfType<MenuItem>())
                {
                    Setters = new[]
                    {
                        new Setter(MenuItem.TemplateProperty, new ControlTemplate<MenuItem>(this.TopLevelTemplate)),
                    },
                },
                new Style(x => x.OfType<MenuItem>().Class("selected").Template().Name("root"))
                {
                    Setters = new[]
                    {
                        new Setter(Border.BackgroundProperty, new SolidColorBrush(0x3d26a0da)),
                        new Setter(Border.BorderBrushProperty, new SolidColorBrush(0xff26a0da)),
                    },
                },
                new Style(x => x.OfType<MenuItem>().Class(":pointerover").Template().Name("root"))
                {
                    Setters = new[]
                    {
                        new Setter(Border.BackgroundProperty, new SolidColorBrush(0x3d26a0da)),
                        new Setter(Border.BorderBrushProperty, new SolidColorBrush(0xff26a0da)),
                    },
                },
                new Style(x => x.OfType<MenuItem>().Class(":empty").Template().Name("rightArrow"))
                {
                    Setters = new[]
                    {
                        new Setter(Path.IsVisibleProperty, false),
                    },
                },
            });
        }

        private Control TopLevelTemplate(MenuItem control)
        {
            Popup popup;

            var result = new Border
            {
                Name = "root",
                [~Border.BackgroundProperty] = control[~MenuItem.BackgroundProperty],
                [~Border.BorderBrushProperty] = control[~MenuItem.BorderBrushProperty],
                [~Border.BorderThicknessProperty] = control[~MenuItem.BorderThicknessProperty],
                Child = new Panel
                {
                    Children = new Controls
                    {
                        new ContentPresenter
                        {
                            DataTemplates = new DataTemplates
                            {
                                AccessKeyDataTemplate,
                            },
                            [~ContentPresenter.ContentProperty] = control[~MenuItem.HeaderProperty],
                            [~ContentPresenter.MarginProperty] = control[~MenuItem.PaddingProperty],
                            [Grid.ColumnProperty] = 1,
                        },
                        (popup = new Popup
                        {
                            Name = "popup",
                            StaysOpen = true,
                            [!!Popup.IsOpenProperty] = control[!!MenuItem.IsSubMenuOpenProperty],
                            Child = new Border
                            {
                                Background = new SolidColorBrush(0xfff0f0f0),
                                BorderBrush = new SolidColorBrush(0xff999999),
                                BorderThickness = 1,
                                Padding = new Thickness(2),
                                Child = new ScrollViewer
                                {
                                    Content = new Panel
                                    {
                                        Children = new Controls
                                        {
                                            new Rectangle
                                            {
                                                Name = "iconSeparator",
                                                Fill = new SolidColorBrush(0xffd7d7d7),
                                                HorizontalAlignment = HorizontalAlignment.Left,
                                                IsHitTestVisible = false,
                                                Margin = new Thickness(29, 2, 0, 2),
                                                Width = 1,
                                            },
                                            new ItemsPresenter
                                            {
                                                Name = "itemsPresenter",
                                                [~ItemsPresenter.ItemsProperty] = control[~Menu.ItemsProperty],
                                                [~ItemsPresenter.ItemsPanelProperty] = control[~Menu.ItemsPanelProperty],
                                                [KeyboardNavigation.TabNavigationProperty] = KeyboardNavigationMode.Cycle,
                                            }
                                        }
                                    }
                                }
                            }
                         })
                    },
                }
            };

            popup.PlacementTarget = result;

            return result;
        }

        private Control PopupTemplate(MenuItem control)
        {
            Popup popup;

            var result = new Border
            {
                Name = "root",
                [~Border.BackgroundProperty] = control[~MenuItem.BackgroundProperty],
                [~Border.BorderBrushProperty] = control[~MenuItem.BorderBrushProperty],
                [~Border.BorderThicknessProperty] = control[~MenuItem.BorderThicknessProperty],
                Child = new Grid
                {
                    ColumnDefinitions = new ColumnDefinitions
                    {
                        new ColumnDefinition(22, GridUnitType.Pixel),
                        new ColumnDefinition(13, GridUnitType.Pixel),
                        new ColumnDefinition(1, GridUnitType.Star),
                        new ColumnDefinition(20, GridUnitType.Pixel),
                    },
                    Children = new Controls
                    {
                        new ContentPresenter
                        {
                            Name = "icon",
                            [~ContentPresenter.ContentProperty] = control[~MenuItem.IconProperty],
                            Width = 16,
                            Height = 16,
                            Margin = new Thickness(3),
                            HorizontalAlignment = HorizontalAlignment.Center,
                            VerticalAlignment = VerticalAlignment.Center,
                        },
                        new Path
                        {
                            Data = StreamGeometry.Parse("F1M10,1.2L4.7,9.1 4.5,9.1 0,5.2 1.3,3.5 4.3,6.1 8.3,0 10,1.2z"),
                            Margin = new Thickness(3),
                            IsVisible = false,
                            VerticalAlignment = VerticalAlignment.Center,
                            [~Path.FillProperty] = control[~MenuItem.ForegroundProperty],
                        },
                        new ContentPresenter
                        {
                            DataTemplates = new DataTemplates
                            {
                                AccessKeyDataTemplate,
                            },
                            VerticalAlignment = VerticalAlignment.Center,
                            [~ContentPresenter.ContentProperty] = control[~MenuItem.HeaderProperty],
                            [~ContentPresenter.MarginProperty] = control[~MenuItem.PaddingProperty],
                            [Grid.ColumnProperty] = 2,
                        },
                        new Path
                        {
                            Name = "rightArrow",
                            Data = StreamGeometry.Parse("M0,0L4,3.5 0,7z"),
                            Fill = new SolidColorBrush(0xff212121),
                            Margin = new Thickness(10, 0, 0, 0),
                            UseLayoutRounding = false,
                            VerticalAlignment = VerticalAlignment.Center,
                            [Grid.ColumnProperty] = 3,
                        },
                        (popup = new Popup
                        {
                            Name = "popup",
                            PlacementMode = PlacementMode.Right,
                            StaysOpen = true,
                            [!!Popup.IsOpenProperty] = control[!!MenuItem.IsSubMenuOpenProperty],
                            Child = new Border
                            {
                                Background = new SolidColorBrush(0xfff0f0f0),
                                BorderBrush = new SolidColorBrush(0xff999999),
                                BorderThickness = 1,
                                Padding = new Thickness(2),
                                Child = new ScrollViewer
                                {
                                    Content = new Panel
                                    {
                                        Children = new Controls
                                        {
                                            new Rectangle
                                            {
                                                Name = "iconSeparator",
                                                Fill = new SolidColorBrush(0xffd7d7d7),
                                                HorizontalAlignment = HorizontalAlignment.Left,
                                                Margin = new Thickness(29, 2, 0, 2),
                                                Width = 1,
                                            },
                                            new ItemsPresenter
                                            {
                                                Name = "itemsPresenter",
                                                [~ItemsPresenter.ItemsProperty] = control[~Menu.ItemsProperty],
                                                [~ItemsPresenter.ItemsPanelProperty] = control[~Menu.ItemsPanelProperty],
                                                [KeyboardNavigation.TabNavigationProperty] = KeyboardNavigationMode.Cycle,
                                            }
                                        }
                                    }
                                }
                            }
                         })
                    },
                }
            };

            popup.PlacementTarget = result;

            return result;
        }
    }
}