using System;
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using CoreGraphics;
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using Foundation;
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using Shared.IO;
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using UIKit;
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namespace Shared
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{
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/// <summary>
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/// 色板
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/// </summary>
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public class ColorPicker :View
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{
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MyUIImageView myUIImageView
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{
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get
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{
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return uiView as MyUIImageView;
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}
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set
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{
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uiView = value;
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}
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="Shared.Button"/> class.
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/// </summary>
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public ColorPicker()
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{
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myUIImageView = new MyUIImageView(this) { };
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}
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public override void Refresh()
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{
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base.Refresh();
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//Width = (int)myUIImageView.Image.Size.Width;
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//Height = (int)myUIImageView.Image.Size.Height;
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}
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string colorImagePath;
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/// <summary>
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/// 色板图
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/// </summary>
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/// <value>The color image path.</value>
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public string ColorImagePath
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{
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get {
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return colorImagePath;
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}
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set
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{
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colorImagePath = value;
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myUIImageView.Image = UIImage.FromFile(FileUtils.GetImageFilePath(colorImagePath));
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}
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}
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/// <summary>
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/// 颜色变化
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/// </summary>
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public Action<View, byte[]> ColorChaged;
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class MyUIImageView : UIImageView
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{
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[Weak] ColorPicker colorPicker;
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public MyUIImageView(ColorPicker colorPicker)
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{
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this.colorPicker = colorPicker;
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UserInteractionEnabled = true;
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}
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/// <summary>
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/// 点击开始
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesBegan(NSSet touches, UIEvent evt)
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{
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colorPicker?.TouchEvent(EventActions.Down,(touches.AnyObject as UITouch).LocationInView(this) );
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colorChaged(colorAtPixel((touches.AnyObject as UITouch).LocationInView(this)));
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}
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/// <summary>
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/// 移动
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesMoved(NSSet touches, UIEvent evt)
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{
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colorPicker?.TouchEvent(EventActions.Move,(touches.AnyObject as UITouch).LocationInView(this));
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colorChaged(colorAtPixel((touches.AnyObject as UITouch).LocationInView(this)));
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}
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/// <summary>
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/// 点击弹起
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/// </summary>
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/// <param name="touches">Touches.</param>
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/// <param name="evt">Evt.</param>
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public override void TouchesEnded(NSSet touches, UIEvent evt)
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{
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colorPicker?.TouchEvent(EventActions.Up,(touches.AnyObject as UITouch).LocationInView(this));
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colorChaged(colorAtPixel((touches.AnyObject as UITouch).LocationInView(this)));
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}
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public override void TouchesCancelled(NSSet touches, UIEvent evt)
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{
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colorPicker?.TouchEvent(EventActions.Cancel, (touches.AnyObject as UITouch).LocationInView(this));
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}
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void colorChaged(UIColor uiColor)
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{
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nfloat r, g, b, a;
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uiColor.GetRGBA(out r, out g, out b, out a);
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if (r == 0 && g == 0 && b == 0)
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{
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return;
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}
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colorPicker?.ColorChaged?.Invoke(colorPicker,new byte[] { (byte)(r * 255), (byte)(g * 255), (byte)(b * 255) });
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}
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UIColor colorAtPixel(CGPoint point)
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{
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var pointX = (int)(point.X *Image.Size.Width/ Frame.Width);
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var pointY = (int)(point.Y * Image.Size.Height / Frame.Height);
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if (Image.Size.Width < pointX) {
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pointX = (int)Image.Size.Width;
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}
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if (Image.Size.Height < pointY) {
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pointY = (int)Image.Size.Height;
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}
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var cgImage = Image.CGImage;
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var colorSpace = CGColorSpace.CreateDeviceRGB();
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int bytesPerPixel = 4;
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int bytesPerRow = bytesPerPixel * 1;
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var bitsPerComponent = 8;
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byte[] pixelData = { 0, 0, 0, 0 };
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var context = new CGBitmapContext(pixelData,
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1,
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1,
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bitsPerComponent,
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bytesPerRow,
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colorSpace, CGBitmapFlags.PremultipliedLast | CGBitmapFlags.ByteOrder32Big);
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context.SetBlendMode(CGBlendMode.Copy);
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context.TranslateCTM(-pointX, pointY - Image.Size.Height);
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context.DrawImage(new CGRect(0.0f, 0.0f, Image.Size.Width, Image.Size.Height), cgImage);
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var red = pixelData[0] / 255.0f;
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var green = pixelData[1] / 255.0f;
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var blue = pixelData[2] / 255.0f;
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var alpha = pixelData[3] / 255.0f;
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return UIColor.FromRGBA(red, green, blue, alpha);
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}
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}
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}
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}
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