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Rendered components for an easier declaration of SkiaSharp rendering.
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README.md Added builders Apr 8, 2018

README.md

SkiaSharp.Components

NuGet Donate

Producing rendering code for SkiaSharp can be extremely verbose and repetitive. SkiaSharp.Components are higher level views that make declarations more concise.

Quickstart

var result = new Grid();

this.Title = new Label
{
    TextSize = 30,
    Text = "Title of the view",
    VerticalAlignment = Alignment.Center,
};

this.Description = new Label
{
    TextSize = 16,
    Spans = new[]
    {
        new Span
        {
            Text = "Nam ut imperdiet nibh. Ut sollicitudin varius nibh,"
        },
        new Span
        {
            ForegroundBrush = new ColorBrush(new SKColor(0xFFF44336)),
            Decorations = TextDecoration.Bold,
            Text = "id ornare tortor convallis sed"
        },
        new Span
        {
            Text = ". Morbi volutpat, lacus efficitur volutpat lacinia, nibh velit ultricies neque, vel faucibus tellus neque at nibh. Nullam vitae tincidunt metus. Vestibulum nec nisl quis lorem tincidunt maximus eu vel lectus. Proin posuere augue molestie imperdiet scelerisque. Phasellus quis suscipit neque."
        },
    },
};

var gradient = new GradientBrush(new SKPoint(0, 0), new SKPoint(0, 1), new[]
{
    new Tuple<float, SKColor>(0, new SKColor(255,255,255,255)),
    new Tuple<float, SKColor>(1, new SKColor(238,238,238,255)),
});

var shadow = new Shadow()
{
    Blur = new SKPoint(10, 10),
    Color = SKColors.Black.WithAlpha(80),
};

this.Image = new Image()
{
    Source = "https://source.unsplash.com/random",
    Fill = new ColorBrush(SKColors.LightGray),
    CornerRadius = 5.0f,
    Shadow = shadow,
};

this.Box = new Box()
{
    Fill = gradient,
    CornerRadius = 5.0f,
    Shadow = shadow,
};

var iconGradient = new GradientBrush(new SKPoint(0, 0), new SKPoint(1, 1), new[]
{
    new Tuple<float, SKColor>(0, new SKColor(0xFFF44336)),
    new Tuple<float, SKColor>(1, new SKColor(0xFF3F51B5)),
});

this.Icon = new Path
{
    Source = IconPath.Aperture,
    ViewBox = SKRect.Create(0, 0, 24, 24),
    Stroke = new Stroke()
    {
        Size = 5,
        Brush = iconGradient,
    },
};

// Setting grid column and rows
result.ColumnDefinitions = new[]
{
    Grid.Definition.Points(100),
    Grid.Definition.Stars(1),
};

result.RowDefinitions = new[]
{
    Grid.Definition.Points(100),
    Grid.Definition.Points(200),
    Grid.Definition.Stars(1),
};

// Setting child positions
result.AddView(this.Icon, 0, 0);
result.AddView(this.Title, 1, 0);
result.AddView(this.Box, 0, 1, 2);
result.AddView(this.Description, 0, 1, 2);

result.Layout(SKRect.Create(0,0,500,500));
result.Render(canvas);

Advanced usage

Invalidation

Each time a property of a view changes, the Invalidated event of a view is raised. This is useful to know when to re-render a view.

Interactions

Basic interactions are available through the Tap control which raises events when the user touches its frame. It is a view like any other components.

this.Button = new Tap()
{
    BackgroundBrush = new ColorBrush(SKColors.DeepPink),
    CornerRadius = 5,
};

this.Button.Tapped += (s,e) => Debug.WriteLine("Tapped");
this.Button.Pressed += (s, e) => ((Tap)s).BackgroundBrush = new ColorBrush(SKColors.LightPink);
this.Button.Released += (s, e) => ((Tap)s).BackgroundBrush = new ColorBrush(SKColors.DeepPink);

If you use provided Renderer, touches will be wired up automatically.

Contributions

Contributions are welcome! If you find a bug please report it and if you want a feature please report it.

If you want to contribute code please file an issue and create a branch off of the current dev branch and file a pull request.

License

MIT © Aloïs Deniel

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