feature: Android renderers
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using Android.Animation;
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using Android.Graphics;
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using Android.Graphics.Drawables;
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using System;
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using AColor = Android.Graphics.Color;
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namespace Pixiview.Droid.Renderers.AppShellSection
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{
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public class AppColorChangeRevealDrawable : AnimationDrawable
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{
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readonly Point _center;
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float _progress;
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bool _disposed;
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ValueAnimator _animator;
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internal AColor StartColor { get; }
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internal AColor EndColor { get; }
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public AppColorChangeRevealDrawable(AColor startColor, AColor endColor, Point center) : base()
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{
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StartColor = startColor;
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EndColor = endColor;
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if (StartColor != EndColor)
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{
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_animator = ValueAnimator.OfFloat(0, 1);
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_animator.SetInterpolator(new Android.Views.Animations.DecelerateInterpolator());
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_animator.SetDuration(500);
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_animator.Update += OnUpdate;
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_animator.Start();
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_center = center;
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}
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else
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{
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_progress = 1;
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}
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}
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public override void Draw(Canvas canvas)
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{
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if (_disposed)
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return;
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if (_progress == 1)
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{
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canvas.DrawColor(EndColor);
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return;
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}
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canvas.DrawColor(StartColor);
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var bounds = Bounds;
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float centerX = _center.X;
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float centerY = _center.Y;
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float width = bounds.Width();
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float distanceFromCenter = Math.Abs(width / 2 - _center.X);
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float radius = (width / 2 + distanceFromCenter) * 1.1f;
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var paint = new Paint
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{
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Color = EndColor
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};
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canvas.DrawCircle(centerX, centerY, radius * _progress, paint);
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}
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void OnUpdate(object sender, ValueAnimator.AnimatorUpdateEventArgs e)
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{
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_progress = (float)e.Animation.AnimatedValue;
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InvalidateSelf();
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}
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protected override void Dispose(bool disposing)
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{
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if (_disposed)
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return;
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_disposed = true;
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if (disposing)
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{
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if (_animator != null)
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{
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_animator.Update -= OnUpdate;
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_animator.Cancel();
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_animator.Dispose();
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_animator = null;
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}
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}
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base.Dispose(disposing);
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}
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}
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}
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@ -0,0 +1,170 @@
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using Android.Content.Res;
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using Android.Graphics.Drawables;
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#if __ANDROID_29__
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using AndroidX.Core.Widget;
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using Google.Android.Material.BottomNavigation;
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#else
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using Android.Support.Design.Internal;
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using Android.Support.Design.Widget;
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#endif
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using System;
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using Xamarin.Forms;
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using Xamarin.Forms.Platform.Android;
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using AColor = Android.Graphics.Color;
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using R = Android.Resource;
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namespace Pixiview.Droid.Renderers.AppShellSection
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{
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public class AppShellBottomNavViewAppearanceTracker : IShellBottomNavViewAppearanceTracker
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{
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[System.Diagnostics.CodeAnalysis.SuppressMessage("CodeQuality", "IDE0052:Remove unread private members", Justification = "<Pending>")]
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IShellContext _shellContext;
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ShellItem _shellItem;
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ColorStateList _defaultList;
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bool _disposed;
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ColorStateList _colorStateList;
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public AppShellBottomNavViewAppearanceTracker(IShellContext shellContext, ShellItem shellItem)
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{
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_shellItem = shellItem;
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_shellContext = shellContext;
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}
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public virtual void ResetAppearance(BottomNavigationView bottomView)
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{
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if (_defaultList != null)
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{
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bottomView.ItemTextColor = _defaultList;
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bottomView.ItemIconTintList = _defaultList;
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}
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SetBackgroundColor(bottomView, Color.White);
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}
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public virtual void SetAppearance(BottomNavigationView bottomView, IShellAppearanceElement appearance)
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{
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IShellAppearanceElement controller = appearance;
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var backgroundColor = controller.EffectiveTabBarBackgroundColor;
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var foregroundColor = controller.EffectiveTabBarForegroundColor;
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var disabledColor = controller.EffectiveTabBarDisabledColor;
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var unselectedColor = controller.EffectiveTabBarUnselectedColor; // currently unused
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var titleColor = controller.EffectiveTabBarTitleColor;
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if (_defaultList == null)
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{
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#if __ANDROID_28__
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_defaultList = bottomView.ItemTextColor ?? bottomView.ItemIconTintList
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?? MakeColorStateList(titleColor.ToAndroid().ToArgb(), disabledColor.ToAndroid().ToArgb(), foregroundColor.ToAndroid().ToArgb());
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#else
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_defaultList = bottomView.ItemTextColor ?? bottomView.ItemIconTintList;
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#endif
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}
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_colorStateList = MakeColorStateList(titleColor, disabledColor, foregroundColor);
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bottomView.ItemTextColor = _colorStateList;
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bottomView.ItemIconTintList = _colorStateList;
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SetBackgroundColor(bottomView, backgroundColor);
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}
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protected virtual void SetBackgroundColor(BottomNavigationView bottomView, Color color)
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{
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var oldBackground = bottomView.Background;
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var colorDrawable = oldBackground as ColorDrawable;
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var colorChangeRevealDrawable = oldBackground as AppColorChangeRevealDrawable;
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AColor lastColor = colorChangeRevealDrawable?.EndColor ?? colorDrawable?.Color ?? Color.Default.ToAndroid();
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AColor newColor;
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if (color == Color.Default)
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newColor = Color.White.ToAndroid();
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else
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newColor = color.ToAndroid();
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if (!(bottomView.GetChildAt(0) is BottomNavigationMenuView menuView))
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{
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if (colorDrawable != null && lastColor == newColor)
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return;
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if (lastColor != newColor || colorDrawable == null)
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{
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bottomView.SetBackground(new ColorDrawable(newColor));
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}
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}
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else
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{
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if (colorChangeRevealDrawable != null && lastColor == newColor)
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return;
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var index = ((IShellItemController)_shellItem).GetItems().IndexOf(_shellItem.CurrentItem);
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var menu = bottomView.Menu;
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index = Math.Min(index, menu.Size() - 1);
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var child = menuView.GetChildAt(index);
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if (child == null)
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return;
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var touchPoint = new Android.Graphics.Point(child.Left + (child.Right - child.Left) / 2, child.Top + (child.Bottom - child.Top) / 2);
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bottomView.SetBackground(new AppColorChangeRevealDrawable(lastColor, newColor, touchPoint));
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}
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}
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ColorStateList MakeColorStateList(Color titleColor, Color disabledColor, Color unselectedColor)
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{
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var disabledInt = disabledColor.IsDefault ?
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_defaultList.GetColorForState(new[] { -R.Attribute.StateEnabled }, AColor.Gray) :
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disabledColor.ToAndroid().ToArgb();
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var checkedInt = titleColor.IsDefault ?
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_defaultList.GetColorForState(new[] { R.Attribute.StateChecked }, AColor.Black) :
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titleColor.ToAndroid().ToArgb();
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var defaultColor = unselectedColor.IsDefault ?
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_defaultList.DefaultColor :
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unselectedColor.ToAndroid().ToArgb();
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return MakeColorStateList(checkedInt, disabledInt, defaultColor);
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}
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ColorStateList MakeColorStateList(int titleColorInt, int disabledColorInt, int defaultColor)
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{
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var states = new int[][] {
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new int[] { -R.Attribute.StateEnabled },
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new int[] {R.Attribute.StateChecked },
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new int[] { }
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};
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var colors = new[] { disabledColorInt, titleColorInt, defaultColor };
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return new ColorStateList(states, colors);
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}
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#region IDisposable
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public void Dispose()
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{
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Dispose(true);
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}
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protected virtual void Dispose(bool disposing)
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{
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if (_disposed)
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return;
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_disposed = true;
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if (disposing)
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{
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_defaultList?.Dispose();
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_colorStateList?.Dispose();
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_shellItem = null;
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_shellContext = null;
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_defaultList = null;
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_colorStateList = null;
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}
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}
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#endregion IDisposable
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}
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}
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