using System;
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using Shared;
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#if __IOS__
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using UIKit;
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using Foundation;
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#else
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using Android.Graphics;
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#endif
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namespace HDL_ON.UI
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{
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/// <summary>
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/// TextButton
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/// 解决iOS 文本到边框有边距问题
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/// 支持根据文本动态计算高度
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/// </summary>
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public class TextButton : Button
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{
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public TextButton()
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{
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#if __IOS__
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//重写修改文本到边框的内边距为0
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(this.uiView as MyButton).ContentEdgeInsets = new UIEdgeInsets(0, 0, 0, 0);
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#endif
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}
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/// <summary>
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/// 设置需要限制的最大行数
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/// 但是超过行数的话会缺少省略号...，暂时无法解决
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/// </summary>
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public int MaxLine = 0;
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/// <summary>
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/// 动态计算高度
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/// 赋值文本后和指定宽度后，通过计算真实的需要宽度和指定宽度算出多行需要的真实高度
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/// 该方法有误差不能100%准确
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/// 最正确方法是根据 单行单个字体的高度加上行距来计算
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/// </summary>
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/// <returns></returns>
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public int GetMoreLineNeedHeight()
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{
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//计算需要的真实宽度
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int needWidth = this.GetTextWidth();
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//计算在指定宽度情况下，需要的真实行数
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int line = (needWidth / this.Width);
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//求余
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int modValue = (needWidth % this.Width);
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//余大于0，则多加一行
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if (modValue > 0)
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{
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line = line + 1;
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}
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if (line > 0)
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{
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if(MaxLine != 0)
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{
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line = Math.Min(line, MaxLine);
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}
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return line * this.Height;
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}
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else
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{
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return this.Height;
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}
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}
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int _lineSpacing;
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/// <summary>
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/// 设置行间距
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/// </summary>
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public int LineSpacing
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{
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set
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{
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_lineSpacing = value;
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SetButtonLineSpacing(_lineSpacing);
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}
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}
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#if __IOS__
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/// <summary>
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/// 按钮设置行距方法
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/// </summary>
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/// <param name="spacing"></param>
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void SetButtonLineSpacing(int spacing)
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{
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UIStringAttributes stringAttributes = new UIStringAttributes
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{
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Font = (this.uiView as MyButton).TitleLabel.Font,
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ForegroundColor = UIColor.Black,
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ParagraphStyle = new NSMutableParagraphStyle() { LineSpacing = spacing }
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};
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var AttributedText = new NSMutableAttributedString(Text);
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AttributedText.AddAttributes(stringAttributes, new NSRange(0, Text.Length));
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(this.uiView as MyButton).TitleLabel.AttributedText = AttributedText;
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}
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/// <summary>
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/// 显示当前文字需要几行
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/// </summary>
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/// <returns></returns>
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public int GetNeedLinesWithWidth()
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{
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return (this.GetTextWidth() / this.Width) * this.Height;
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//return 0;
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}
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#else
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/// <summary>
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/// 按钮设置行距方法
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/// </summary>
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/// <param name="spacing"></param>
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void SetButtonLineSpacing(int spacing)
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{
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(this.AndroidView as Android.Widget.Button).SetLineSpacing(spacing, 1);
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}
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/// <summary>
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///
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/// </summary>
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/// <returns></returns>
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int GetTextHeight()
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{
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string text = "Text";
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Rect rect = new Rect();
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(this.AndroidView as Android.Widget.Button).Paint.GetTextBounds(text, 0, text.Length, rect);
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return rect.Height();
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}
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#endif
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}
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}
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