internal void UpdateBarBackgroundColor()
{
if (Element.BarBackground != null)
{
return;
}
if (IsBottomTabPlacement)
{
Color tintColor = Element.BarBackgroundColor;
if (tintColor == null)
{
_bottomNavigationView.SetBackground(null);
}
else if (tintColor != null)
{
_bottomNavigationView.SetBackgroundColor(tintColor.ToPlatform());
}
}
else
{
Color tintColor = Element.BarBackgroundColor;
if (tintColor == null)
{
_tabLayout.BackgroundTintMode = null;
}
else
{
_tabLayout.BackgroundTintMode = PorterDuff.Mode.Src;
_tabLayout.BackgroundTintList = ColorStateList.ValueOf(tintColor.ToPlatform());
}
}
}
protected virtual ColorStateList GetItemTextColorStates()
{
if (_originalTabTextColors == null)
{
_originalTabTextColors = (IsBottomTabPlacement) ? _bottomNavigationView.ItemTextColor : _tabLayout.TabTextColors;
}
Color barItemColor = BarItemColor;
Color barTextColor = Element.BarTextColor;
Color barSelectedItemColor = BarSelectedItemColor;
if (barItemColor == null && barTextColor == null && barSelectedItemColor == null)
{
return(_originalTabTextColors);
}
if (_newTabTextColors != null)
{
return(_newTabTextColors);
}
int checkedColor;
int defaultColor;
if (barTextColor != null)
{
checkedColor = barTextColor.ToPlatform().ToArgb();
defaultColor = checkedColor;
}
else
{
defaultColor = barItemColor.ToPlatform().ToArgb();
if (barItemColor == null && _originalTabTextColors != null)
{
defaultColor = _originalTabTextColors.DefaultColor;
}
checkedColor = defaultColor;
if (barSelectedItemColor != null)
{
checkedColor = barSelectedItemColor.ToPlatform().ToArgb();
}
}
_newTabTextColors = GetColorStateList(defaultColor, checkedColor);
return(_newTabTextColors);
}
protected virtual ColorStateList GetItemIconTintColorState()
{
if (IsBottomTabPlacement)
{
if (_orignalTabIconColors == null)
{
_orignalTabIconColors = _bottomNavigationView.ItemIconTintList;
}
}
// this ensures that existing behavior doesn't change
else if (!IsBottomTabPlacement && BarSelectedItemColor != null && BarItemColor == null)
{
return(null);
}
Color barItemColor = BarItemColor;
Color barSelectedItemColor = BarSelectedItemColor;
if (barItemColor == null && barSelectedItemColor == null)
{
return(_orignalTabIconColors);
}
if (_newTabIconColors != null)
{
return(_newTabIconColors);
}
int defaultColor = barItemColor.ToPlatform().ToArgb();
if (barItemColor == null && _orignalTabIconColors != null)
{
defaultColor = _orignalTabIconColors.DefaultColor;
}
int checkedColor = defaultColor;
if (barSelectedItemColor != null)
{
checkedColor = barSelectedItemColor.ToPlatform().ToArgb();
}
_newTabIconColors = GetColorStateList(defaultColor, checkedColor);
return(_newTabIconColors);
}
public static void UpdateBackground(this GradientDrawable gradientDrawable, Brush brush, int height, int width)
{
if (gradientDrawable == null || brush == null || brush.IsEmpty)
{
return;
}
if (brush is SolidColorBrush solidColorBrush)
{
Color bgColor = solidColorBrush.Color;
gradientDrawable.SetColor(bgColor?.ToPlatform() ?? Colors.Transparent.ToPlatform());
}
if (brush is LinearGradientBrush linearGradientBrush)
{
var p1 = linearGradientBrush.StartPoint;
var x1 = (float)p1.X;
var y1 = (float)p1.Y;
var p2 = linearGradientBrush.EndPoint;
var x2 = (float)p2.X;
var y2 = (float)p2.Y;
const double Rad2Deg = 180.0 / Math.PI;
float xDiff = x2 - x1;
float yDiff = y2 - y1;
double angle = Math.Atan2(yDiff, xDiff) * Rad2Deg;
if (angle < 0)
{
angle += 360;
}
var gradientBrushData = linearGradientBrush.GetGradientBrushData();
var colors = gradientBrushData.Item1;
if (colors.Length < 2)
{
return;
}
gradientDrawable.SetGradientType(GradientType.LinearGradient);
gradientDrawable.SetColors(colors);
SetGradientOrientation(gradientDrawable, angle);
}
if (brush is RadialGradientBrush radialGradientBrush)
{
var center = radialGradientBrush.Center;
float centerX = (float)center.X;
float centerY = (float)center.Y;
float radius = (float)radialGradientBrush.Radius;
var gradientBrushData = radialGradientBrush.GetGradientBrushData();
var colors = gradientBrushData.Item1;
if (colors.Length < 2)
{
return;
}
gradientDrawable.SetGradientType(GradientType.RadialGradient);
gradientDrawable.SetGradientCenter(centerX, centerY);
gradientDrawable.SetGradientRadius(Math.Max(height, width) * radius);
gradientDrawable.SetColors(colors);
}
}
