using System;
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using System.Collections.Generic;
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using AVFoundation;
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using CoreGraphics;
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using UIKit;
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namespace HDL_ON
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{
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public class ZXingOverlayView : UIView
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{
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public UILabel textBottom;
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UIView redLine;
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public Action OnCancel;
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public Action OnTorch;
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public UIBarButtonItem cancelButton;
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public UIBarButtonItem torchButton;
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public string cancelText = "取消";
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public string flashText = "闪光灯";
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public string bottomText = "扫一扫";
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CGSize screenSize = UIScreen.MainScreen.Bounds.Size;
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public ZXingOverlayView(string cancelText = "取消", string flashText = "闪光灯", string titleText = "扫一扫") : base()
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{
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this.cancelText = cancelText;
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this.flashText = flashText;
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this.bottomText = titleText;
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Opaque = false;
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BackgroundColor = UIColor.Clear;
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textBottom = new UILabel()
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{
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Frame = new CGRect(0, (screenSize.Height - 44 + screenSize.Width * 0.75f) / 2, screenSize.Width, 40f),
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Text = bottomText,
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Font = UIFont.SystemFontOfSize(13),
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TextAlignment = UITextAlignment.Center,
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TextColor = UIColor.White,
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Lines = 0,
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BackgroundColor = UIColor.Clear
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};
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this.AddSubview(textBottom);
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var captureDevice = AVCaptureDevice.GetDefaultDevice(AVMediaType.Video);
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bool hasTorch = false;
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if (captureDevice != null)
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hasTorch = captureDevice.TorchAvailable;
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InvokeOnMainThread(delegate {
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// Setting tool bar
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var toolBar = new UIToolbar(new CGRect(0, Frame.Height - 44, Frame.Width, 44));
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var buttons = new List<UIBarButtonItem>();
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cancelButton = new UIBarButtonItem(cancelText, UIBarButtonItemStyle.Done, delegate { OnCancel?.Invoke(); });
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cancelButton.SetTitleTextAttributes(new UITextAttributes { TextColor = UIColor.White }, UIControlState.Normal);
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buttons.Add(cancelButton);
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if (hasTorch)
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{
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buttons.Add(new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace));
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torchButton = new UIBarButtonItem(flashText, UIBarButtonItemStyle.Done, delegate { OnTorch?.Invoke(); });
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torchButton.SetTitleTextAttributes(new UITextAttributes { TextColor = UIColor.White }, UIControlState.Normal);
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buttons.Add(torchButton);
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}
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toolBar.Items = buttons.ToArray();
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toolBar.BarTintColor = UIColor.Clear;
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toolBar.Translucent = true;
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toolBar.TintColor = UIColor.Black;
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toolBar.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleTopMargin;
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Add(toolBar);
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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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CGRect screenDrawRect = new CGRect(0, 0, screenSize.Width, screenSize.Height - 44);
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//中间清空的矩形框
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CGRect clearDrawRect = new CGRect(screenDrawRect.Size.Width * 0.125f, (screenDrawRect.Size.Height - screenDrawRect.Size.Width * 0.75f) / 2,
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screenDrawRect.Size.Width * 0.75f, screenDrawRect.Size.Width * 0.75f);
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CGContext ctx = UIGraphics.GetCurrentContext();
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AddScreenFillRect(ctx, screenDrawRect);
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AddCenterClearRect(ctx, clearDrawRect);
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AddWhiteRect(ctx, clearDrawRect);
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AddCornerLineWithContext(ctx, clearDrawRect);
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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(CGContext ctx, CGRect rect)
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{
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ctx.SetFillColor(new CGColor(0, 0, 0, 0.5f));
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ctx.FillRect(rect);
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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(CGContext ctx, CGRect rect)
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{
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ctx.ClearRect(rect);
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}
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//根据点画线
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private void AddLine(CGPoint[] pointA, CGPoint[] pointB, CGContext ctx)
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{
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ctx.SetLineWidth(2f);
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ctx.AddLines(pointA);
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ctx.AddLines(pointB);
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}
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//添加白色方框
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private void AddWhiteRect(CGContext ctx, CGRect rect)
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{
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ctx.StrokeRect(rect);
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ctx.SetStrokeColor(new CGColor(1, 1, 1, 1));
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ctx.SetLineWidth(0.8f);
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ctx.AddRect(rect);
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ctx.StrokePath();
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}
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//添加四个角的蓝色
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private void AddCornerLineWithContext(CGContext ctx, CGRect rect)
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{
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//画四个边角
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ctx.SetLineWidth(2f);
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ctx.SetStrokeColor(UIColor.FromRGB(22, 118, 188).CGColor);
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//左上角
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CGPoint[] poinsTopLeftA = new CGPoint[] { new CGPoint(rect.Location.X + 0.7f, rect.Location.Y), new CGPoint(rect.Location.X + 0.7f, rect.Location.Y + 15f) };
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CGPoint[] poinsTopLeftB = new CGPoint[] { new CGPoint(rect.Location.X, rect.Location.Y + 0.7f), new CGPoint(rect.Location.X + 15f, rect.Location.Y + 0.7f) };
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AddLine(poinsTopLeftA, poinsTopLeftB, ctx);
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//左下角
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CGPoint[] poinsBottomLeftA = new CGPoint[] { new CGPoint(rect.Location.X + 0.7f, rect.Location.Y + rect.Size.Height - 15f), new CGPoint(rect.Location.X + 0.7f, rect.Location.Y + rect.Size.Height) };
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CGPoint[] poinsBottomLeftB = new CGPoint[] { new CGPoint(rect.Location.X, rect.Location.Y + rect.Size.Height - 0.7f), new CGPoint(rect.Location.X + 0.7f + 15f, rect.Location.Y + rect.Size.Height - 0.7f) };
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AddLine(poinsBottomLeftA, poinsBottomLeftB, ctx);
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//右上角
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CGPoint[] poinsTopRightA = new CGPoint[] { new CGPoint(rect.Location.X + rect.Size.Width - 15f, rect.Location.Y + 0.7f), new CGPoint(rect.Location.X + rect.Size.Width, rect.Location.Y + 0.7) };
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CGPoint[] poinsTopRightB = new CGPoint[] { new CGPoint(rect.Location.X + rect.Size.Width - 0.7f, rect.Location.Y), new CGPoint(rect.Location.X + rect.Size.Width - 0.7f, rect.Location.Y + 15 + 0.7) };
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AddLine(poinsTopRightA, poinsTopRightB, ctx);
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CGPoint[] poinsBottomRightA = new CGPoint[] { new CGPoint(rect.Location.X + rect.Size.Width - 0.7f, rect.Location.Y + rect.Size.Height - 15f), new CGPoint(rect.Location.X - 0.7f + rect.Size.Width, rect.Location.Y + rect.Size.Height) };
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CGPoint[] poinsBottomRightB = new CGPoint[] { new CGPoint(rect.Location.X + rect.Size.Width - 15f, rect.Location.Y + rect.Size.Height - 0.7f), new CGPoint(rect.Location.X + rect.Size.Width, rect.Location.Y + rect.Size.Height - 0.7f) };
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AddLine(poinsBottomRightA, poinsBottomRightB, ctx);
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ctx.StrokePath();
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}
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public void Destroy()
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{
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InvokeOnMainThread(() => {
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textBottom.RemoveFromSuperview();
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redLine.RemoveFromSuperview();
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textBottom = null;
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redLine = null;
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});
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}
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}
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}
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