using System;
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using CoreGraphics;
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using Foundation;
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using UIKit;
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namespace Shared
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{
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public class GradientMaskView : View
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{
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GradientButton mGradientButton
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{
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get
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{
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return uiView as GradientButton;
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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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public GradientMaskView()
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{
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mGradientButton = new GradientButton(this) { };
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SetGradientColors(mGradientColors);
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}
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//CAGradientLayer gradient = new CAGradientLayer();
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//void SetCAGradientLayer()
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//{
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// gradient.Colors = new CoreGraphics.CGColor[] { startUIColor.CGColor, endUIColor.CGColor };
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// gradient.StartPoint = new CoreGraphics.CGPoint(0, 0);
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// gradient.EndPoint = new CoreGraphics.CGPoint(0.0, 1.0);
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// //gradient.Locations = new Foundation.NSNumber[] { 0.0, 1.0};
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// gradient.Frame = iosButton.Bounds;
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// iosButton.Layer.AddSublayer(gradient);
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//}
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/// <summary>
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/// 刷新布局
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/// </summary>
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private void RefreshFrame()
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{
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(uiView as GradientButton).InitWithFrameArc(new CoreGraphics.CGRect(base.X, base.Y, base.Width, base.Height));
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}
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/// <summary>
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/// 控件宽度
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/// </summary>
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public override int Width
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{
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get
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{
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return base.Width;
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}
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set
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{
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base.Width = value;
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RefreshFrame();
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}
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}
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/// <summary>
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/// 控件的高度
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/// </summary>
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public override int Height
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{
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get
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{
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return base.Height;
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}
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set
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{
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base.Height = value;
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RefreshFrame();
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}
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}
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/// <summary>
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/// 控件的X坐标
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/// </summary>
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public override int X
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{
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get
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{
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return base.X;
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}
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set
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{
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base.X = value;
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RefreshFrame();
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}
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}
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/// <summary>
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/// 控件的X坐标
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/// </summary>
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public override int Y
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{
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get
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{
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return base.Y;
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}
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set
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{
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base.Y = value;
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RefreshFrame();
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}
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}
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public bool IsShow
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{
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get
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{
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return mGradientButton.IsShow;
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}
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set
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{
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mGradientButton.IsShow = value;
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}
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}
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/// <summary>
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/// 0%，25%，50%，80%
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/// </summary>
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uint[] mGradientColors = { 0x00000000, 0x40000000, 0x80000000, 0xCC000000 };
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public uint[] GradientColors {
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get
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{
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return mGradientColors;
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}
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set
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{
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mGradientColors = value;
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SetGradientColors(mGradientColors);
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}
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}
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void SetGradientColors(uint[] colors) {
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if (colors == null || colors.Length == 0) return;
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CGColor[] mCGColors = new CGColor[colors.Length];
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for (int i = 0; i < colors.Length; i++) {
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mCGColors[i] = HDLUtils.GetUIColorWithUint(colors[i]).CGColor;
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}
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mGradientButton.GradientColors = mCGColors;
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}
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public class GradientButton : UIKit.UIView
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{
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/// <summary>
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/// 刷新布局
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/// </summary>
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public void InitWithFrameArc(CGRect mCGRect)
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{
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this.Frame = mCGRect;
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}
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[Weak] View view;
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public GradientButton(View view)
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{
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this.view = view;
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}
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bool isShow = true;
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public bool IsShow
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{
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get
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{
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return isShow;
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}
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set
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{
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isShow = value;
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SetNeedsDisplay();
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}
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}
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public override void Draw(CGRect rect)
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{
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base.Draw(rect);
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if (isShow)
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{
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CGContext ctx = UIGraphics.GetCurrentContext();
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if (ctx == null) return;
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ctx.SaveState();
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DrawWithGradient(ctx, rect);
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ctx.RestoreState();
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}
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}
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/// <summary>
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/// 绘制渐变效果
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/// </summary>
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/// <param name="ctx"></param>
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/// <param name="rect"></param>
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void DrawWithGradient(CGContext ctx, CGRect rect)
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{
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// 创建一个渐变色
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// 创建RGB色彩空间，创建这个以后，context里面用的颜色都是用RGB表示
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CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
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CGGradient gradient = new CGGradient(colorSpace, mGradientColors);
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// 释放色彩空间
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colorSpace.Dispose();
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colorSpace = null;
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// 剪裁路径
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ctx.Clip();
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// 用渐变色填充
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ctx.DrawLinearGradient(gradient, new CGPoint(rect.X, rect.Top), new CGPoint(rect.X, rect.Bottom), CGGradientDrawingOptions.None);
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// 释放渐变色
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gradient.Dispose();
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gradient = null;
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ctx.RestoreState();
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ctx.SaveState();
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}
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public CGColor[] mGradientColors = { UIColor.Clear.CGColor};
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public CGColor[] GradientColors {
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get
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{
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return mGradientColors;
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}
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set
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{
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mGradientColors = value;
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SetNeedsDisplay();
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}
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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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view?.TouchEvent(EventActions.Down, (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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view?.TouchEvent(EventActions.Move, (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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view?.TouchEvent(EventActions.Up, (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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view?.TouchEvent(EventActions.Cancel, (touches.AnyObject as UITouch).LocationInView(this));
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}
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}
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}
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}
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