Maui/samples/CommunityToolkit.Maui.Sample/ViewModels/Views/CameraView/CameraViewViewModel.cs at a3b654f6796ff01b13f1898c6dc47a8ddc8edfb7 · CommunityToolkit/Maui · GitHub

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using CommunityToolkit.Maui.Core;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

namespace CommunityToolkit.Maui.Sample.ViewModels.Views;

public partial class CameraViewViewModel : BaseViewModel
{
	readonly ICameraProvider cameraProvider;

	public CameraViewViewModel(ICameraProvider cameraProvider)
	{
		this.cameraProvider = cameraProvider;

		cameraProvider.AvailableCamerasChanged += HandleAvailableCamerasChanged;
	}

	public IReadOnlyList<CameraInfo> Cameras => cameraProvider.AvailableCameras ?? [];

	public CancellationToken Token => CancellationToken.None;

	public ICollection<CameraFlashMode> FlashModes { get; } = Enum.GetValues<CameraFlashMode>();

	[ObservableProperty]
	public partial CameraFlashMode FlashMode { get; set; }

	[ObservableProperty]
	public partial CameraInfo? SelectedCamera { get; set; }

	[ObservableProperty]
	public partial Size SelectedResolution { get; set; }

	[ObservableProperty]
	public partial float CurrentZoom { get; set; }

	[ObservableProperty]
	public partial string CameraNameText { get; set; } = string.Empty;

	[ObservableProperty]
	public partial string ZoomRangeText { get; set; } = string.Empty;

	[ObservableProperty]
	public partial string CurrentZoomText { get; set; } = string.Empty;

	[ObservableProperty]
	public partial string FlashModeText { get; set; } = string.Empty;

	[ObservableProperty]
	public partial string ResolutionText { get; set; } = string.Empty;

	[RelayCommand]
	async Task RefreshCameras(CancellationToken token) => await cameraProvider.RefreshAvailableCameras(token);

	partial void OnFlashModeChanged(CameraFlashMode value)
	{
		UpdateFlashModeText();
	}

	partial void OnCurrentZoomChanged(float value)
	{
		UpdateCurrentZoomText();
	}

	partial void OnSelectedResolutionChanged(Size value)
	{
		UpdateResolutionText();
	}

	void UpdateFlashModeText()
	{
		if (SelectedCamera is null)
		{
			return;
		}
		FlashModeText = $"{(SelectedCamera.IsFlashSupported ? $"Flash mode: {FlashMode}" : "Flash not supported")}";
	}

	void UpdateCurrentZoomText()
	{
		CurrentZoomText = $"Current Zoom: {CurrentZoom}";
	}

	void UpdateResolutionText()
	{
		ResolutionText = $"Selected Resolution: {SelectedResolution.Width} x {SelectedResolution.Height}";
	}

	void HandleAvailableCamerasChanged(object? sender, IReadOnlyList<CameraInfo>? e)
	{
		OnPropertyChanged(nameof(Cameras));
	}
}