Instantly share code, notes, and snippets.
Last active
February 28, 2019 04:17
-
Star
(0)
0
You must be signed in to star a gist -
Fork
(0)
0
You must be signed in to fork a gist
-
Save jesulink2514/272a8248f4010fe11be16b630045a686 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
using NControl.Abstractions; | |
using NGraphics; | |
using System.Collections.Generic; | |
using System.Windows.Input; | |
using Xamarin.Forms; | |
using Color = Xamarin.Forms.Color; | |
using Point = NGraphics.Point; | |
using TextAlignment = Xamarin.Forms.TextAlignment; | |
namespace DemoGradient.Controls | |
{ | |
public class GradientButton : NControlView | |
{ | |
public GradientButton() | |
{ | |
HeightRequest = 44; | |
WidthRequest = 100; | |
_label = new Label | |
{ | |
Text = Text, | |
TextColor = TextColor, | |
FontSize = 17, | |
BackgroundColor = Color.Transparent, | |
HorizontalTextAlignment = TextAlignment.Center, | |
VerticalTextAlignment = TextAlignment.Center | |
}; | |
_background = new NControlView | |
{ | |
DrawingFunction = (canvas, rect) => | |
{ | |
var brush = new LinearGradientBrush( | |
Point.Zero, | |
Point.OneX, | |
StartColor.ToNColor(), | |
EndColor.ToNColor()); | |
var curveSize = BorderRadius; | |
var width = rect.Width; | |
var height = rect.Height; | |
canvas.DrawPath(new PathOp[]{ | |
new MoveTo(curveSize, 0), | |
// Top Right corner | |
new LineTo(width-curveSize, 0), | |
new CurveTo( | |
new Point(width-curveSize, 0), | |
new Point(width, 0), | |
new Point(width, curveSize) | |
), | |
new LineTo(width, height-curveSize), | |
// Bottom right corner | |
new CurveTo( | |
new Point(width, height-curveSize), | |
new Point(width, height), | |
new Point(width-curveSize, height) | |
), | |
new LineTo(curveSize, height), | |
// Bottom left corner | |
new CurveTo( | |
new Point(curveSize, height), | |
new Point(0, height), | |
new Point(0, height-curveSize) | |
), | |
new LineTo(0, curveSize), | |
new CurveTo( | |
new Point(0, curveSize), | |
new Point(0, 0), | |
new Point(curveSize, 0) | |
), | |
new ClosePath() | |
}, null, brush); | |
} | |
}; | |
Content = new Grid | |
{ | |
Children = { | |
_background, | |
_label | |
} | |
}; | |
} | |
public Color StartColor | |
{ | |
get => (Color)GetValue(StartColorProperty); | |
set | |
{ | |
SetValue(StartColorProperty, value); | |
Invalidate(); | |
} | |
} | |
public Color EndColor | |
{ | |
get => (Color)GetValue(EndColorProperty); | |
set | |
{ | |
SetValue(EndColorProperty, value); | |
Invalidate(); | |
} | |
} | |
public static BindableProperty StartColorProperty = | |
BindableProperty.Create(nameof(StartColor), typeof(Color), typeof(GradientButton), defaultBindingMode: BindingMode.OneWay, | |
propertyChanged: (b, o, n) => | |
{ | |
var ctrl = (GradientButton)b; | |
ctrl.StartColor = (Color)n; | |
}); | |
public static BindableProperty EndColorProperty = | |
BindableProperty.Create(nameof(EndColor), typeof(Color), typeof(GradientButton), defaultBindingMode: BindingMode.OneWay, | |
propertyChanged: (b, o, n) => | |
{ | |
var ctrl = (GradientButton)b; | |
ctrl.EndColor = (Color)n; | |
}); | |
public int BorderRadius | |
{ | |
get => (int)GetValue(BorderRadiusProperty); | |
set | |
{ | |
SetValue(BorderRadiusProperty, value); | |
Invalidate(); | |
} | |
} | |
public const int DefaultRadius = 40; | |
public static BindableProperty BorderRadiusProperty = | |
BindableProperty.Create(nameof(BorderRadius), typeof(int), typeof(GradientButton), DefaultRadius, BindingMode.OneTime, | |
propertyChanged: (b, o, n) => | |
{ | |
var ctrl = (GradientButton)b; | |
ctrl.BorderRadius = (int)n; | |
}); | |
public string Text | |
{ | |
get => GetValue(TextProperty) as string; | |
set | |
{ | |
SetValue(TextProperty, value); | |
_label.Text = value; | |
Invalidate(); | |
} | |
} | |
public static BindableProperty TextProperty = | |
BindableProperty.Create(nameof(Text), typeof(string), typeof(GradientButton), defaultBindingMode: BindingMode.OneWay, | |
propertyChanged: (b, o, n) => | |
{ | |
var ctrl = (GradientButton)b; | |
ctrl.Text = (string)n; | |
}); | |
public Color TextColor | |
{ | |
get => (Color)GetValue(TextColorProperty); | |
set | |
{ | |
SetValue(TextColorProperty, value); | |
_label.TextColor = value; | |
Invalidate(); | |
} | |
} | |
public static BindableProperty TextColorProperty = | |
BindableProperty.Create(nameof(TextColor), typeof(Color), typeof(GradientButton), defaultBindingMode: BindingMode.OneWay, | |
propertyChanged: (b, o, n) => | |
{ | |
var ctrl = (GradientButton)b; | |
ctrl.TextColor = (Color)n; | |
}); | |
public static BindableProperty CommandProperty = | |
BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(GradientButton), defaultBindingMode: BindingMode.OneWay, | |
propertyChanged: (bindable, oldValue, newValue) => | |
{ | |
var ctrl = (GradientButton)bindable; | |
ctrl.Command = (ICommand)newValue; | |
}); | |
public ICommand Command | |
{ | |
get => (ICommand)GetValue(CommandProperty); | |
set => SetValue(CommandProperty, value); | |
} | |
public static BindableProperty CommandParameterProperty = | |
BindableProperty.Create(nameof(CommandParameter), typeof(object), typeof(GradientButton), defaultBindingMode: BindingMode.TwoWay, | |
propertyChanged: (bindable, oldValue, newValue) => | |
{ | |
var ctrl = (GradientButton)bindable; | |
ctrl.CommandParameter = newValue; | |
}); | |
private readonly Label _label; | |
private readonly NControlView _background; | |
public object CommandParameter | |
{ | |
get => GetValue(CommandParameterProperty); | |
set => SetValue(CommandParameterProperty, value); | |
} | |
public override bool TouchesBegan(IEnumerable<Point> points) | |
{ | |
base.TouchesBegan(points); | |
this.ScaleTo(0.96, 65, Easing.CubicInOut); | |
return true; | |
} | |
public override bool TouchesCancelled(IEnumerable<Point> points) | |
{ | |
base.TouchesCancelled(points); | |
this.ScaleTo(1.0, 65, Easing.CubicInOut); | |
return true; | |
} | |
public override bool TouchesEnded(IEnumerable<Point> points) | |
{ | |
base.TouchesEnded(points); | |
this.ScaleTo(1.0, 65, Easing.CubicInOut); | |
if (Command != null && Command.CanExecute(CommandParameter)) | |
Command.Execute(CommandParameter); | |
return true; | |
} | |
} | |
public static class ColorHelpers | |
{ | |
public static NGraphics.Color ToNColor(this Color color) | |
{ | |
return new NGraphics.Color(color.R, color.G, color.B, color.A); | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment