using System;
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using Android.Content;
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using Android.Graphics;
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using Android.Util;
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using Android.Views;
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using Android.Widget;
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namespace GateWay.Droid
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{
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public class ZXingOverlayView: View
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{
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float screenRate;
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float lineWidth;
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float textSize;
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float left;
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float width;
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float height;
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float top;
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Paint paint;
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public ZXingOverlayView(Context context) : base(context)
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{
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InitData(context);
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}
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public ZXingOverlayView(Context context, IAttributeSet attrs) : base(context, attrs)
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{
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InitData(context);
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}
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public override void Draw(Canvas canvas)
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{
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left = canvas.Width * 0.125f;
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width = canvas.Width * 0.75f;
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height = canvas.Width * 0.75f;
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top = (canvas.Height - height) / 2;
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paint = new Paint { AntiAlias = true, };
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paint.SetStyle(Paint.Style.FillAndStroke);
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AddScreenFillRect(canvas);
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AddCenterClearRect(canvas);
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AddWhiteCanvas(canvas);
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AddCornerLineWithCanvas(canvas);
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//AddTextWithCanvas(canvas);
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}
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private void InitData(Context context)
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{
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screenRate = 15 * context.Resources.DisplayMetrics.Density;
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lineWidth = 2 * context.Resources.DisplayMetrics.Density;
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textSize = 16 * context.Resources.DisplayMetrics.Density;
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}
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//添加屏幕半透明填充色
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private void AddScreenFillRect(Canvas canvas)
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{
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paint.Color = Color.Black;
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paint.Alpha = 128;
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canvas.DrawRect(0, 0, canvas.Width, top, paint);
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canvas.DrawRect(0, top, left, top + width, paint);
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canvas.DrawRect(width + left, top, canvas.Width, top + width, paint);
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canvas.DrawRect(0, top + width, canvas.Width, canvas.Height, paint);
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}
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//添加中心全透明填充色
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private void AddCenterClearRect(Canvas canvas)
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{
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paint.Color = Color.Transparent;
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canvas.DrawRect(left, top, left + width, top + width, paint);
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}
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//添加白色方框
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private void AddWhiteCanvas(Canvas canvas)
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{
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paint.Color = Color.Rgb(255, 255, 255);
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canvas.DrawRect(left, top, left + width, top + 2, paint);
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canvas.DrawRect(left, top, left + 2, top + height, paint);
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canvas.DrawRect(left + width, top, left + width + 2, top + height, paint);
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canvas.DrawRect(left, top + height, left + width, top + height + 2, paint);
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}
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//添加四个角的蓝色
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private void AddCornerLineWithCanvas(Canvas canvas)
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{
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paint.Color = Color.Rgb(22, 118, 188);
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canvas.DrawRect(left, top, left + screenRate, top + lineWidth, paint);
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canvas.DrawRect(left, top, left + lineWidth, top + screenRate, paint);
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canvas.DrawRect(left + width - screenRate, top, left + width, top + lineWidth, paint);
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canvas.DrawRect(left + width, top, left + width + lineWidth, top + screenRate, paint);
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canvas.DrawRect(left, top + width, left + screenRate, top + width + lineWidth, paint);
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canvas.DrawRect(left, top + width - screenRate, left + lineWidth, top + width, paint);
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canvas.DrawRect(left + width - screenRate, top + width, left + width + lineWidth, top + width + lineWidth, paint);
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canvas.DrawRect(left + width, top + width - screenRate, left + width + lineWidth, top + width + lineWidth, paint);
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}
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//添加文字提醒
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private void AddTextWithCanvas(Canvas canvas)
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{
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paint.Color = Color.Rgb(255, 255, 255);
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paint.SetTypeface(Typeface.DefaultBold);
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paint.TextSize = textSize;
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string text = "BottomText";
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float textWidth = paint.MeasureText(text);
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canvas.DrawText(text, (canvas.Width - textWidth) / 2, top + width + textSize, paint);
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//canvas.DrawText("返回", 50, 100, paint);
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}
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}
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}
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