protected override void OnElementChanged(ElementChangedEventArgs <ColorGradientBox> e)
{
base.OnElementChanged(e);
GradientDrawable.Orientation orientation = (Element.Orientation == StackOrientation.Horizontal ? GradientDrawable.Orientation.LeftRight : GradientDrawable.Orientation.BottomTop);
int[] colors = { Element.EndColor.ToAndroid(), Element.StartColor.ToAndroid() };
if (Android.OS.Build.VERSION.SdkInt < Android.OS.BuildVersionCodes.JellyBean)
#pragma warning disable CS0618 // Type or member is obsolete
{
SetBackgroundDrawable(e.NewElement != null ? new GradientDrawable(orientation, colors) : null);
}
#pragma warning restore CS0618 // Type or member is obsolete
else
{
if (Android.OS.Build.VERSION.SdkInt < Android.OS.BuildVersionCodes.JellyBean)
#pragma warning disable CS0618 // Type or member is obsolete
{
SetBackgroundDrawable(e.NewElement != null ? new GradientDrawable(orientation, colors) : null);
}
#pragma warning restore CS0618 // Type or member is obsolete
else
{
Background = e.NewElement != null ? new GradientDrawable(orientation, colors) : null;
}
}
}
protected override void OnElementChanged(ElementChangedEventArgs <Xamarin.Forms.Image> e)
{
base.OnElementChanged(e);
int startColor = BaseControl.StartColor.ToAndroid().ToArgb();
int endColor = BaseControl.EndColor.ToAndroid().ToArgb();
int[] colors = { startColor, endColor };
//float[] radii = { 5, 5, 5, 5, 5, 5, 5, 5 };
GradientDrawable.Orientation orientation = null;
Android.Graphics.Drawables.GradientType gradientType;
switch (BaseControl.Orientation)
{
case GradientOrientation.BottomTop: orientation = GradientDrawable.Orientation.BottomTop; break;
case GradientOrientation.LeftRight: orientation = GradientDrawable.Orientation.LeftRight; break;
case GradientOrientation.RightLeft: orientation = GradientDrawable.Orientation.RightLeft; break;
case GradientOrientation.TopBottom: orientation = GradientDrawable.Orientation.TopBottom; break;
default: orientation = GradientDrawable.Orientation.TopBottom; break;
}
switch (BaseControl.GradientStyle)
{
case GradientType.Linear: gradientType = Android.Graphics.Drawables.GradientType.LinearGradient; break;
case GradientType.Sweep: gradientType = Android.Graphics.Drawables.GradientType.SweepGradient; break;
case GradientType.Radial: gradientType = Android.Graphics.Drawables.GradientType.RadialGradient; break;
default: gradientType = gradientType = Android.Graphics.Drawables.GradientType.LinearGradient; break;
}
GradientDrawable drawable = new GradientDrawable(orientation, colors);
drawable.SetGradientType(gradientType);
//drawable.SetCornerRadii(radii);
//drawable.SetStroke(1, Android.Graphics.Color.ParseColor("#FF000000"));
drawable.SetCornerRadius(0f);
this.Control.SetBackgroundDrawable(drawable);
}
protected override void OnAttached()
{
GradientEffect gradientEffect = (GradientEffect)Element.Effects.First(e => e is GradientEffect);
Android.Graphics.Color startColor = gradientEffect.StartColor.ToAndroid();
Android.Graphics.Color endColor = gradientEffect.EndColor.ToAndroid();
int[] colors = new int[] { startColor, endColor };
GradientDrawable.Orientation orientation = GradientDrawable.Orientation.TopBottom;
switch (gradientEffect.Direction)
{
case GradientDirection.TopLeft_BottomRight: orientation = GradientDrawable.Orientation.TlBr; break;
case GradientDirection.TopBottom: orientation = GradientDrawable.Orientation.TopBottom; break;
case GradientDirection.TopRight_BottomLeft: orientation = GradientDrawable.Orientation.TrBl; break;
case GradientDirection.LeftRight: orientation = GradientDrawable.Orientation.LeftRight; break;
case GradientDirection.RightLeft: orientation = GradientDrawable.Orientation.RightLeft; break;
case GradientDirection.BottomRight_TopLeft: orientation = GradientDrawable.Orientation.BrTl; break;
case GradientDirection.BottomTop: orientation = GradientDrawable.Orientation.BottomTop; break;
case GradientDirection.BottomLeft_TopRight: orientation = GradientDrawable.Orientation.BlTr; break;
}
GradientDrawable drawable = new GradientDrawable(orientation, colors);
if (Control == null)
{
prevBackground = Container.Background;
Container.Background = drawable;
}
else
{
prevBackground = Control.Background;
Control.Background = drawable;
}
}
public static Drawable CreateBackgroundGradient(Color startColor, Color endColor, Color centerColor,
float cornerRadius, GradientDrawable.Orientation orientation)
{
GradientDrawable gradientDrawable = new GradientDrawable();
gradientDrawable.SetShape(ShapeType.Rectangle);
gradientDrawable.SetCornerRadius(cornerRadius);
if (centerColor != Xamarin.Forms.Color.Transparent.ToAndroid())
{
gradientDrawable.SetColors(new int[] { startColor,
centerColor, endColor });
}
else
{
gradientDrawable.SetColors(new int[] { startColor, endColor });
}
gradientDrawable.SetGradientType(GradientType.LinearGradient);
gradientDrawable.SetOrientation(orientation);
return(gradientDrawable);
}
