using System;
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using Android.Content;
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using Android.Graphics;
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using Android.Views;
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namespace Shared
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{
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/// <summary>
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/// GradientMaskView
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/// </summary>
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public class GradientMaskView : View
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{
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/// <summary>
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/// 当前视图
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/// </summary>
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/// <value>The android GradientMaskView.</value>
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GradientButton mGradientButton
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{
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get
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{
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return AndroidView as GradientButton;
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}
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set
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{
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AndroidView = value;
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}
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}
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/// <summary>
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/// 构造函数
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/// </summary>
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public GradientMaskView()
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{
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mGradientButton = new GradientButton(Application.Activity, this);
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SetGradientColors(mGradientColors);
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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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{
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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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{
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if (colors == null || colors.Length == 0) return;
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int[] mCGColors = new int[colors.Length];
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for (int i = 0; i < colors.Length; i++)
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{
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mCGColors[i] = HDLUtils.GetUIColorWithUint(colors[i]);
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}
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mGradientButton.GradientColors = mCGColors;
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}
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public class GradientButton : Android.Views.View
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{
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View view;
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public GradientButton(Context context, View view)
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: base(context)
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{
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this.view = view;
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initPaint();
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}
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public override bool OnTouchEvent(MotionEvent e)
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{
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var v = base.OnTouchEvent(e);
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view?.TouchEvent(e);
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return true;
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}
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// 初始化进度圆弧画笔
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private void initPaint()
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{
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mPaint = new Paint(); //初始化进度圆弧画笔
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mPaint.AntiAlias = true;
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mPaint.SetStyle(Paint.Style.Fill);
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}
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/// <summary>
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/// 绘图的Paint
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/// </summary>
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private Paint mPaint;
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protected override void OnDraw(Canvas canvas)
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{
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base.OnDraw(canvas);
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if (isShow)
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{
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canvas.Save();
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DrawWithGradient(canvas);
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canvas.Restore();
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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="canvas"></param>
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void DrawWithGradient(Canvas canvas)
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{
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var gradient = new LinearGradient(0, 0, 0, Height, mGradientColors, null, Shader.TileMode.Mirror);
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mPaint.SetShader(gradient);
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canvas.DrawRect(0, 0, Width, Height, mPaint);
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}
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public int[] mGradientColors = { Android.Graphics.Color.Transparent };
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public int[] GradientColors
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{
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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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PostInvalidate();
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}
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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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PostInvalidate();
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}
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}
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}
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}
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}
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