maui-linux/Handlers/SearchBarHandler.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.Maui.Handlers;
using Microsoft.Maui.Graphics;
using SkiaSharp;

namespace Microsoft.Maui.Platform.Linux.Handlers;

/// <summary>
/// Handler for SearchBar on Linux using Skia rendering.
/// Maps ISearchBar interface to SkiaSearchBar platform view.
/// </summary>
public partial class SearchBarHandler : ViewHandler<ISearchBar, SkiaSearchBar>
{
    public static IPropertyMapper<ISearchBar, SearchBarHandler> Mapper = new PropertyMapper<ISearchBar, SearchBarHandler>(ViewHandler.ViewMapper)
    {
        [nameof(ITextInput.Text)] = MapText,
        [nameof(ITextStyle.TextColor)] = MapTextColor,
        [nameof(ITextStyle.Font)] = MapFont,
        [nameof(IPlaceholder.Placeholder)] = MapPlaceholder,
        [nameof(IPlaceholder.PlaceholderColor)] = MapPlaceholderColor,
        [nameof(ISearchBar.CancelButtonColor)] = MapCancelButtonColor,
        [nameof(IView.Background)] = MapBackground,
    };

    public static CommandMapper<ISearchBar, SearchBarHandler> CommandMapper = new(ViewHandler.ViewCommandMapper)
    {
    };

    public SearchBarHandler() : base(Mapper, CommandMapper)
    {
    }

    public SearchBarHandler(IPropertyMapper? mapper, CommandMapper? commandMapper = null)
        : base(mapper ?? Mapper, commandMapper ?? CommandMapper)
    {
    }

    protected override SkiaSearchBar CreatePlatformView()
    {
        return new SkiaSearchBar();
    }

    protected override void ConnectHandler(SkiaSearchBar platformView)
    {
        base.ConnectHandler(platformView);
        platformView.TextChanged += OnTextChanged;
        platformView.SearchButtonPressed += OnSearchButtonPressed;
    }

    protected override void DisconnectHandler(SkiaSearchBar platformView)
    {
        platformView.TextChanged -= OnTextChanged;
        platformView.SearchButtonPressed -= OnSearchButtonPressed;
        base.DisconnectHandler(platformView);
    }

    private void OnTextChanged(object? sender, TextChangedEventArgs e)
    {
        if (VirtualView is null || PlatformView is null) return;

        if (VirtualView.Text != e.NewTextValue)
        {
            VirtualView.Text = e.NewTextValue ?? string.Empty;
        }
    }

    private void OnSearchButtonPressed(object? sender, EventArgs e)
    {
        VirtualView?.SearchButtonPressed();
    }

    public static void MapText(SearchBarHandler handler, ISearchBar searchBar)
    {
        if (handler.PlatformView is null) return;

        if (handler.PlatformView.Text != searchBar.Text)
            handler.PlatformView.Text = searchBar.Text ?? string.Empty;
    }

    public static void MapTextColor(SearchBarHandler handler, ISearchBar searchBar)
    {
        if (handler.PlatformView is null) return;

        if (searchBar.TextColor is not null)
            handler.PlatformView.TextColor = searchBar.TextColor.ToSKColor();
    }

    public static void MapFont(SearchBarHandler handler, ISearchBar searchBar)
    {
        if (handler.PlatformView is null) return;

        var font = searchBar.Font;
        if (font.Size > 0)
            handler.PlatformView.FontSize = (float)font.Size;

        if (!string.IsNullOrEmpty(font.Family))
            handler.PlatformView.FontFamily = font.Family;
    }

    public static void MapPlaceholder(SearchBarHandler handler, ISearchBar searchBar)
    {
        if (handler.PlatformView is null) return;
        handler.PlatformView.Placeholder = searchBar.Placeholder ?? string.Empty;
    }

    public static void MapPlaceholderColor(SearchBarHandler handler, ISearchBar searchBar)
    {
        if (handler.PlatformView is null) return;

        if (searchBar.PlaceholderColor is not null)
            handler.PlatformView.PlaceholderColor = searchBar.PlaceholderColor.ToSKColor();
    }

    public static void MapCancelButtonColor(SearchBarHandler handler, ISearchBar searchBar)
    {
        if (handler.PlatformView is null) return;

        // CancelButtonColor maps to ClearButtonColor
        if (searchBar.CancelButtonColor is not null)
            handler.PlatformView.ClearButtonColor = searchBar.CancelButtonColor.ToSKColor();
    }


    public static void MapBackground(SearchBarHandler handler, ISearchBar searchBar)
    {
        if (handler.PlatformView is null) return;

        if (searchBar.Background is SolidPaint solidPaint && solidPaint.Color is not null)
        {
            handler.PlatformView.BackgroundColor = solidPaint.Color.ToSKColor();
        }
    }
}