private void SetBackgroundCompat(Drawable drawable)
{
if (HasLollipopApi)
{
#if __ANDROID_21__
var elevation = 0.0f;
if (hasShadow)
{
elevation = Elevation > 0.0f ? Elevation : Resources.GetDimensionPixelSize(Resource.Dimension.fab_elevation_lollipop);
}
Elevation = elevation;
var states = new int[][] { new int[] { } };
var rippleDrawable = new RippleDrawable(new Android.Content.Res.ColorStateList(states, new int[] { colorRipple }), drawable, null);
OutlineProvider = new MyOutlineProvider(Resources, size);
ClipToOutline = true;
Background = rippleDrawable;
#endif
}
else if (HasJellyBeanApi)
{
#if __ANDROID_16__
Background = drawable;
#endif
}
else
{
ViewCompat.SetBackground(this, drawable);
}
}
protected override void OnElementChanged(ElementChangedEventArgs <StackLayout> e)
{
base.OnElementChanged(e);
if (e.OldElement != null || Element == null)
{
return;
}
try
{
var stack = e.NewElement as GradientStackLayout;
this.StartColor = stack.StartColor;
this.EndColor = stack.EndColor;
var gradient = new GradientDrawable(
GradientDrawable.Orientation.TopBottom,
new[] { this.StartColor.ToAndroid().ToArgb(), this.EndColor.ToAndroid().ToArgb() }
);
ViewCompat.SetBackground(this, gradient);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(@"ERROR:", ex.Message);
}
}
private void setTabBG(int tab1, int tab2)
{
if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.JellyBeanMr1)
{
ViewGroup tabStrip = (ViewGroup)tabLayout.GetChildAt(0);
View tabView1 = tabStrip.GetChildAt(0);
View tabView2 = tabStrip.GetChildAt(1);
if (tabView1 != null)
{
int paddingStart = tabView1.PaddingStart;
int paddingTop = tabView1.PaddingTop;
int paddingEnd = tabView1.PaddingEnd;
int paddingBottom = tabView1.PaddingBottom;
ViewCompat.SetBackground(tabView1, AppCompatResources.GetDrawable(this.Context, tab1));
ViewCompat.SetPaddingRelative(tabView1, paddingStart, paddingTop, paddingEnd, paddingBottom);
}
if (tabView2 != null)
{
int paddingStart = tabView2.PaddingStart;
int paddingTop = tabView2.PaddingTop;
int paddingEnd = tabView2.PaddingEnd;
int paddingBottom = tabView2.PaddingBottom;
ViewCompat.SetBackground(tabView2, AppCompatResources.GetDrawable(this.Context, tab2));
ViewCompat.SetPaddingRelative(tabView2, paddingStart, paddingTop, paddingEnd, paddingBottom);
}
}
}
protected virtual void SetBackgroundColor(BottomNavigationView bottomView, Color color)
{
var menuView = bottomView.GetChildAt(0) as BottomNavigationMenuView;
var oldBackground = bottomView.Background;
var colorDrawable = oldBackground as ColorDrawable;
var colorChangeRevealDrawable = oldBackground as ColorChangeRevealDrawable;
AColor lastColor = colorChangeRevealDrawable?.EndColor ?? colorDrawable?.Color ?? Colors.Transparent.ToPlatform();
AColor newColor;
if (color == null)
{
newColor = ShellView.DefaultBottomNavigationViewBackgroundColor.ToPlatform();
}
else
{
newColor = color.ToPlatform();
}
if (menuView == null)
{
if (colorDrawable != null && lastColor == newColor)
{
return;
}
if (lastColor != newColor || colorDrawable == null)
{
// taken from android source code
var backgroundColor = new MaterialShapeDrawable();
backgroundColor.FillColor = ColorStateList.ValueOf(newColor);
backgroundColor.InitializeElevationOverlay(bottomView.Context);
ViewCompat.SetBackground(bottomView, backgroundColor);
}
}
else
{
if (colorChangeRevealDrawable != null && lastColor == newColor)
{
return;
}
var index = ((IShellItemController)_shellItem).GetItems().IndexOf(_shellItem.CurrentItem);
var menu = bottomView.Menu;
index = Math.Min(index, menu.Size() - 1);
var child = menuView.GetChildAt(index);
if (child == null)
{
return;
}
var touchPoint = new Point(child.Left + (child.Right - child.Left) / 2, child.Top + (child.Bottom - child.Top) / 2);
ViewCompat.SetBackground(bottomView, new ColorChangeRevealDrawable(lastColor, newColor, touchPoint));
}
}
protected override void OnElementChanged(ElementChangedEventArgs <Frame> e)
{
base.OnElementChanged(e);
if (e.NewElement != null && Control != null && e.NewElement is GradientFrame frame)
{
var gradient = new GradientDrawable(GradientDrawable.Orientation.TlBr, new[]
{
frame.StartColor.ToAndroid().ToArgb(),
frame.MiddleColor.ToAndroid().ToArgb(),
frame.EndColor.ToAndroid().ToArgb()
});
ViewCompat.SetBackground(this, gradient);
UpdateCornerRadius();
}
}
/// <summary>
/// Method to set the color of the material design ripple when the button is clicked.
/// If the Android version is less than Lollipop (5.0) then the ripple will be a solid color
/// Note: the default is the default for material design.
/// </summary>
/// <params>
/// Color
/// </params>
public void SetRippleColor(Color rippleColor)
{
ViewCompat.SetBackground(_button, GetImageButtonBackground(rippleColor));
}
protected override void DispatchDraw(global::Android.Graphics.Canvas canvas)
{
GradientLayout layout = (GradientLayout)this.Element;
Color[] Colors = layout.Colors;
GradientColorStackMode Mode = layout.Mode;
int[] colors = new int[Colors.Length];
for (int i = 0, l = Colors.Length; i < l; i++)
{
colors[i] = Colors[i].ToAndroid().ToArgb();
}
// temporary workaround for Android 9 PIE
if (Android.OS.Build.VERSION.SdkInt > Android.OS.BuildVersionCodes.O)
{
GradientDrawable.Orientation orientation;
switch (Mode)
{
default:
case GradientColorStackMode.ToRight:
orientation = GradientDrawable.Orientation.LeftRight;
break;
case GradientColorStackMode.ToTop:
orientation = GradientDrawable.Orientation.BottomTop;
break;
case GradientColorStackMode.ToBottom:
orientation = GradientDrawable.Orientation.TopBottom;
break;
case GradientColorStackMode.ToTopLeft:
orientation = GradientDrawable.Orientation.BrTl;
break;
case GradientColorStackMode.ToTopRight:
orientation = GradientDrawable.Orientation.BlTr;
break;
case GradientColorStackMode.ToBottomLeft:
orientation = GradientDrawable.Orientation.TrBl;
break;
case GradientColorStackMode.ToBottomRight:
orientation = GradientDrawable.Orientation.TlBr;
break;
}
var gradient2 = new GradientDrawable(orientation, colors);
ViewCompat.SetBackground(this, gradient2);
base.DispatchDraw(canvas);
return;
}
Android.Graphics.LinearGradient gradient;
switch (Mode)
{
default:
case GradientColorStackMode.ToRight:
gradient = new Android.Graphics.LinearGradient(0, 0, Width, 0, colors, null, Android.Graphics.Shader.TileMode.Mirror);
break;
case GradientColorStackMode.ToLeft:
gradient = new Android.Graphics.LinearGradient(Width, 0, 0, 0, colors, null, Android.Graphics.Shader.TileMode.Mirror);
break;
case GradientColorStackMode.ToTop:
gradient = new Android.Graphics.LinearGradient(0, Height, 0, 0, colors, null, Android.Graphics.Shader.TileMode.Mirror);
break;
case GradientColorStackMode.ToBottom:
gradient = new Android.Graphics.LinearGradient(0, 0, 0, Height, colors, null, Android.Graphics.Shader.TileMode.Mirror);
break;
case GradientColorStackMode.ToTopLeft:
gradient = new Android.Graphics.LinearGradient(Width, Height, 0, 0, colors, null, Android.Graphics.Shader.TileMode.Mirror);
break;
case GradientColorStackMode.ToTopRight:
gradient = new Android.Graphics.LinearGradient(0, Height, Width, 0, colors, null, Android.Graphics.Shader.TileMode.Mirror);
break;
case GradientColorStackMode.ToBottomLeft:
gradient = new Android.Graphics.LinearGradient(Width, 0, 0, Height, colors, null, Android.Graphics.Shader.TileMode.Mirror);
break;
case GradientColorStackMode.ToBottomRight:
gradient = new Android.Graphics.LinearGradient(0, 0, Width, Height, colors, null, Android.Graphics.Shader.TileMode.Mirror);
break;
}
var paint = new Android.Graphics.Paint()
{
Dither = true,
};
paint.SetShader(gradient);
canvas.DrawPaint(paint);
base.DispatchDraw(canvas);
}
public void OnItemClear()
{
ViewCompat.SetBackground(_itemView, _initialColor);
}