1 files changed, 160 insertions, 0 deletions
diff --git a/Xamarin.Forms.ControlGallery.Android/ColorPicker.cs b/Xamarin.Forms.ControlGallery.Android/ColorPicker.cs
new file mode 100644
index 00000000..8e047870
--- /dev/null
+++ b/Xamarin.Forms.ControlGallery.Android/ColorPicker.cs
@@ -0,0 +1,160 @@
+using System;
+using System.ComponentModel;
+using Android.Content;
+using Android.Views;
+using Android.Widget;
+using Xamarin.Forms.Platform.Android;
+using Droid = Android;
+
+namespace Xamarin.Forms.ControlGallery.Android
+{
+	public class ColorPickerView : ViewGroup
+	//, INotifyPropertyChanged
+	{
+		static readonly int[] COLORS = new[] {
+				new Droid.Graphics.Color(255,0,0,255).ToArgb(), new Droid.Graphics.Color(255,0,255,255).ToArgb(), new Droid.Graphics.Color(0,0,255,255).ToArgb(),
+				new Droid.Graphics.Color(0,255,255,255).ToArgb(), new Droid.Graphics.Color(0,255,0,255).ToArgb(), new Droid.Graphics.Color(255,255,0,255).ToArgb(),
+				new Droid.Graphics.Color(255,0,0,255).ToArgb()
+			};
+		Droid.Graphics.Point currentPoint;
+		ColorPointer colorPointer;
+		ImageView imageViewSelectedColor;
+		ImageView imageViewPallete;
+		Droid.Graphics.Color selectedColor;
+		Droid.Graphics.Color previewColor;
+
+		//public event PropertyChangedEventHandler PropertyChanged;
+		public event EventHandler ColorPicked;
+
+		public ColorPickerView(Context context, int minWidth, int minHeight) : base(context)
+		{
+			SelectedColor = Color.Black.ToAndroid();
+
+			SetMinimumHeight(minHeight);
+			SetMinimumWidth(minWidth);
+
+			imageViewPallete = new ImageView(context);
+			imageViewPallete.DrawingCacheEnabled = true;
+			imageViewPallete.Background = new Droid.Graphics.Drawables.GradientDrawable(Droid.Graphics.Drawables.GradientDrawable.Orientation.LeftRight, COLORS);
+
+			imageViewPallete.Touch += (object sender, TouchEventArgs e) =>
+			{
+				if (e.Event.Action == MotionEventActions.Down || e.Event.Action == MotionEventActions.Move)
+				{
+					currentPoint = new Droid.Graphics.Point((int)e.Event.GetX(), (int)e.Event.GetY());
+
+					previewColor = GetCurrentColor(imageViewPallete.GetDrawingCache(false), (int)e.Event.GetX(), (int)e.Event.GetY());
+				}
+				if (e.Event.Action == MotionEventActions.Up)
+				{
+					SelectedColor = previewColor;
+				}
+			};
+
+			imageViewSelectedColor = new ImageView(context);
+			colorPointer = new ColorPointer(context);
+
+			AddView(imageViewPallete);
+			AddView(imageViewSelectedColor);
+			AddView(colorPointer);
+		}
+
+		public Droid.Graphics.Color SelectedColor
+		{
+			get
+			{
+				return selectedColor;
+			}
+
+			set
+			{
+				if (selectedColor == value)
+					return;
+
+				selectedColor = value;
+				UpdateUi();
+				OnPropertyChanged();
+				OnColorPicked();
+			}
+		}
+
+		protected override void OnLayout(bool changed, int left, int top, int right, int bottom)
+		{
+			var half = (bottom - top) / 2;
+			var margin = 20;
+
+			var palleteY = top + half;
+
+			imageViewSelectedColor.Layout(left, top, right, bottom - half - margin);
+			imageViewPallete.Layout(left, palleteY, right, bottom);
+			colorPointer.Layout(left, palleteY, right, bottom);
+		}
+
+		void UpdateUi()
+		{
+			imageViewSelectedColor?.SetBackgroundColor(selectedColor);
+			colorPointer?.UpdatePoint(currentPoint);
+		}
+
+		Droid.Graphics.Color GetCurrentColor(Droid.Graphics.Bitmap bitmap, int x, int y)
+		{
+			if (bitmap == null)
+				return new Droid.Graphics.Color(255, 255, 255, 255);
+
+			if (x < 0)
+				x = 0;
+			if (y < 0)
+				y = 0;
+			if (x >= bitmap.Width)
+				x = bitmap.Width - 1;
+			if (y >= bitmap.Height)
+				y = bitmap.Height - 1;
+
+			int color = bitmap.GetPixel(x, y);
+			return new Droid.Graphics.Color(color);
+		}
+
+		void OnPropertyChanged([System.Runtime.CompilerServices.CallerMemberName] string propertyName = null)
+		{
+			//PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+		}
+
+		void OnColorPicked()
+		{
+			ColorPicked?.Invoke(this, new EventArgs());
+		}
+	}
+
+	public class ColorPointer : Droid.Views.View
+	{
+		Droid.Graphics.Paint colorPointerPaint;
+		Droid.Graphics.Point currentPoint;
+		Droid.Graphics.Point nextPoint;
+
+		public ColorPointer(Context context) : base(context)
+		{
+
+			colorPointerPaint = new Droid.Graphics.Paint();
+			colorPointerPaint.SetStyle(Droid.Graphics.Paint.Style.Stroke);
+			colorPointerPaint.StrokeWidth = 5f;
+			colorPointerPaint.SetARGB(255, 0, 0, 0);
+
+		}
+
+		public void UpdatePoint(Droid.Graphics.Point p)
+		{
+			if (p == null)
+				return;
+
+			if (currentPoint == null)
+				currentPoint = nextPoint;
+
+			nextPoint = p;
+		}
+
+		protected override void OnDraw(Droid.Graphics.Canvas canvas)
+		{
+			base.OnDraw(canvas);
+		}
+	}
+}