ShrlAlgoToolkit/WPFluent/Controls/NavigationView/NavigationView.TemplateParts.cs

// Based on Windows UI Library
// Copyright(c) Microsoft Corporation.All rights reserved.

// ReSharper disable once CheckNamespace
namespace WPFluent.Controls;

/// <content>
/// Defines the template parts for the <see cref="NavigationView"/> control
/// </content>
[TemplatePart(Name = TemplateElementNavigationViewContentPresenter, Type = typeof(NavigationViewContentPresenter)
)]
[TemplatePart(Name = TemplateElementMenuItemsItemsControl, Type = typeof(System.Windows.Controls.ItemsControl)
)]
[TemplatePart(Name = TemplateElementFooterMenuItemsItemsControl, Type = typeof(System.Windows.Controls.ItemsControl)
)]
[TemplatePart(Name = TemplateElementBackButton, Type = typeof(System.Windows.Controls.Button))]
[TemplatePart(Name = TemplateElementToggleButton, Type = typeof(System.Windows.Controls.Button))]
[TemplatePart(Name = TemplateElementAutoSuggestBoxSymbolButton, Type = typeof(System.Windows.Controls.Button)
)]
public partial class NavigationView
{
    /// <summary>
    /// Template element represented by the <c>PART_AutoSuggestBoxSymbolButton</c> name.
    /// </summary>
    private const string TemplateElementAutoSuggestBoxSymbolButton = "PART_AutoSuggestBoxSymbolButton";

    /// <summary>
    /// Template element represented by the <c>PART_BackButton</c> name.
    /// </summary>
    private const string TemplateElementBackButton = "PART_BackButton";

    /// <summary>
    /// Template element represented by the <c>PART_FooterMenuItemsItemsControl</c> name.
    /// </summary>
    private const string TemplateElementFooterMenuItemsItemsControl = "PART_FooterMenuItemsItemsControl";

    /// <summary>
    /// Template element represented by the <c>PART_MenuItemsItemsControl</c> name.
    /// </summary>
    private const string TemplateElementMenuItemsItemsControl = "PART_MenuItemsItemsControl";
    /// <summary>
    /// Template element represented by the <c>PART_MenuItemsItemsControl</c> name.
    /// </summary>
    private const string TemplateElementNavigationViewContentPresenter =
        "PART_NavigationViewContentPresenter";

    /// <summary>
    /// Template element represented by the <c>PART_ToggleButton</c> name.
    /// </summary>
    private const string TemplateElementToggleButton = "PART_ToggleButton";

    protected T GetTemplateChild<T>(string name) where T : DependencyObject
    {
        if(GetTemplateChild(name) is not T dependencyObject)
        {
            throw new ArgumentNullException(name);
        }

        return dependencyObject;
    }

    /// <summary>
    /// Gets or sets the control that is visitable if PaneDisplayMode="Left" and in compact state
    /// </summary>
    protected System.Windows.Controls.Button? AutoSuggestBoxSymbolButton { get; set; }

    /// <summary>
    /// Gets or sets the control located at the top of the pane with left arrow icon.
    /// </summary>
    protected System.Windows.Controls.Button? BackButton { get; set; }

    /// <summary>
    /// Gets or sets the control located at the top of the pane with hamburger icon.
    /// </summary>
    protected System.Windows.Controls.ItemsControl FooterMenuItemsItemsControl { get; set; } = null!;

    /// <summary>
    /// Gets or sets the control located at the top of the pane with left arrow icon.
    /// </summary>
    protected System.Windows.Controls.ItemsControl MenuItemsItemsControl { get; set; } = null!;

    /// <summary>
    /// Gets or sets the control responsible for rendering the content.
    /// </summary>
    protected NavigationViewContentPresenter NavigationViewContentPresenter { get; set; } = null!;

    /// <summary>
    /// Gets or sets the control located at the top of the pane with hamburger icon.
    /// </summary>
    protected System.Windows.Controls.Button? ToggleButton { get; set; }

    /// <inheritdoc/>
    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        NavigationViewContentPresenter = GetTemplateChild<NavigationViewContentPresenter>(
            TemplateElementNavigationViewContentPresenter);
        MenuItemsItemsControl = GetTemplateChild<System.Windows.Controls.ItemsControl>(
            TemplateElementMenuItemsItemsControl);
        FooterMenuItemsItemsControl = GetTemplateChild<System.Windows.Controls.ItemsControl>(
            TemplateElementFooterMenuItemsItemsControl);

        MenuItemsItemsControl.SetCurrentValue(System.Windows.Controls.ItemsControl.ItemsSourceProperty, MenuItems);
        FooterMenuItemsItemsControl.SetCurrentValue(
            System.Windows.Controls.ItemsControl.ItemsSourceProperty,
            FooterMenuItems);

        if(NavigationViewContentPresenter is not null)
        {
            NavigationViewContentPresenter.Navigated -= OnNavigationViewContentPresenterNavigated;
            NavigationViewContentPresenter.Navigated += OnNavigationViewContentPresenterNavigated;
        }

        if(GetTemplateChild(TemplateElementAutoSuggestBoxSymbolButton)
            is System.Windows.Controls.Button autoSuggestBoxSymbolButton)
        {
            AutoSuggestBoxSymbolButton = autoSuggestBoxSymbolButton;

            AutoSuggestBoxSymbolButton.Click -= AutoSuggestBoxSymbolButtonOnClick;
            AutoSuggestBoxSymbolButton.Click += AutoSuggestBoxSymbolButtonOnClick;
        }

        if(GetTemplateChild(TemplateElementBackButton) is System.Windows.Controls.Button backButton)
        {
            BackButton = backButton;

            BackButton.Click -= OnBackButtonClick;
            BackButton.Click += OnBackButtonClick;
        }

        if(GetTemplateChild(TemplateElementToggleButton) is System.Windows.Controls.Button toggleButton)
        {
            ToggleButton = toggleButton;

            ToggleButton.Click -= OnToggleButtonClick;
            ToggleButton.Click += OnToggleButtonClick;
        }
    }
}