Question

我正在尝试编写一个给出描述的方法，并且标记将返回填充字符串中填充行的填充字符串。我以为我可能已经使用了当前的代码，但我注意到它高估了Graphics.MeasureString(...)字符的宽度。经过一番挖掘后，我发现MeasureString以枚举GraphicsUnits为单位PageUnits返回其值。

下面是我创建的SSCCE来显示我的问题。我不确定如何将给定的PageUnit转换为像素。有什么想法吗？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace StringPadProj
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            theListBox.Items.Add(getPaddedStr("meow", "[Cat]"));
            theListBox.Items.Add(getPaddedStr("woof", "[Dog]"));
            theListBox.Items.Add(getPaddedStr("chirp", "[Bird]"));
            theListBox.Items.Add(getPaddedStr("cricket", "[Cricket]"));
        }

        private String getPaddedStr(String desc, String tag)
        {
            int availSpacePx = theListBox.Width;
            Console.Out.WriteLine("ListBoxW: " + availSpacePx);
            Graphics e = theListBox.CreateGraphics();
            e.PageUnit = GraphicsUnit.Pixel;
            Font listBFont = theListBox.Font;
            SizeF charSize = e.MeasureString("k", listBFont);
            Console.Out.WriteLine("CharSize: " + charSize);
            int numCharPerLine = (int)Math.Floor(availSpacePx / charSize.Width);
            Console.Out.WriteLine("CharsPerLine: " + numCharPerLine);

            int tagLen = tag.Length;
            int spaceLeft = numCharPerLine - tagLen;
            if (desc.Length > spaceLeft)
                desc = desc.Substring(0, spaceLeft);
            else if (desc.Length < spaceLeft)
                while (desc.Length < spaceLeft)
                    desc += " ";
            String itemText = desc + tag;

            return itemText;
        }

        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.theListBox = new System.Windows.Forms.ListBox();
            this.SuspendLayout();
            // 
            // theListBox
            // 
            this.theListBox.Font = new System.Drawing.Font("Courier New", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.theListBox.FormattingEnabled = true;
            this.theListBox.ItemHeight = 14;
            this.theListBox.Location = new System.Drawing.Point(12, 12);
            this.theListBox.Name = "theListBox";
            this.theListBox.Size = new System.Drawing.Size(350, 172);
            this.theListBox.TabIndex = 0;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(374, 198);
            this.Controls.Add(this.theListBox);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.ListBox theListBox;
    }
}

编辑：

所以似乎MeasureString(...)正在做它应该做的事情。据我所知，问题在于theListBox.Width值的单位。似乎它们不是以像素为单位测量的。我实际上找不到任何引用Control.Width单位的确切内容。

现在的问题是，如何将Control.Width的单位转换/找到像素？

Answer 1

编辑：新答案：

MeasureString上的MSDN说明了一切：

MeasureString方法设计用于单个字符串并包括字符串前后的少量额外空间允许悬垂的字形。此外，DrawString方法调整字形指向优化显示质量并可能显示字符串比MeasureString报告的要窄。获得适合的指标对于布局中的相邻字符串（例如，实现时）格式化文本），使用MeasureCharacterRanges方法或其中之一 MeasureString方法，它接受StringFormat并传递 GenericTypographic。另外，请确保TextRenderingHint 图形是AntiAlias。

因此，将measure命令更改为类似的命令将获得适合乘以的单个字符的度量（当使用等宽字体时）：

SizeF charSize = e.MeasureString("k", listBFont, 
                                 PointF.Empty, StringFormat.GenericTypographic);

测量Courier字符宽度以填充列表框

1 个答案: