2

我正在尝试实现绘制的所有者，ListView因为基本控件吃掉了我需要在列中对齐值的制表符。

使用来自MSDN的示例作为基础，我能够接近。我仍然遇到的唯一问题是，当文本不适合列时使用的省略号周期比默认文本渲染中的间隔要紧密得多；如果字体是粗体，则句点会一起变成下划线。

下面的程序演示了这个问题。它有 4ListView秒：顶部的两个是使用默认渲染绘制的。底部的两个是所有者绘制的，右侧的一对是粗体的。出于篇幅原因，我删除了所有我不需要的东西来演示问题，这就是为什么所有者绘制ListView的 s 没有列标题。

查看放大的屏幕截图，所有者绘制ListView的 s 中省略号的周期间隔一个像素；默认绘图中的那些有两个像素的间距。当加粗将周期扩大到两个像素时，所有者绘制的那些合并在一起形成一个看起来像下划线的实体块。

文本渲染也有其他细微差别；但省略号是唯一一个无需缩放即可明显看出的省略号。然而，这些差异确实让我怀疑这个问题是一个更普遍的问题。 可能是 GDI 与 GDI+ 渲染？除了我认为这只能在应用程序级别有所不同。 显然不是，切换Application.SetCompatibleTextRenderingDefault()没有影响任何东西。

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public class Form1 : Form
    {
        private void ListViewDrawSubItem(object sender, 
                                         DrawListViewSubItemEventArgs e)
        {
            ListView listView = sender as ListView;
            using (StringFormat sf = new StringFormat())
            {
                // Draw the standard background.
                e.DrawBackground();
                sf.SetTabStops(0, new float[] {12, 12, 12, 12, 12});
                sf.FormatFlags = sf.FormatFlags | StringFormatFlags.NoWrap;
                sf.Trimming = StringTrimming.EllipsisCharacter;

                // Draw the header text.
                // passing the controls font directly causes an 
                // ArguementException);
                using (Font headerFont = new Font(listView.Font.Name, 
                                                  listView.Font.Size, 
                                                  listView.Font.Style))
                {
                    e.Graphics.DrawString(e.SubItem.Text, headerFont, 
                                          Brushes.Black, e.Bounds, sf);
                }
            }
        }

        public Form1()
        {
            InitializeComponent();
            LoadData(listView1);
            LoadData(listView2);
            LoadData(listView3);
            LoadData(listView4);
        }

        private void LoadData(ListView listView)
        {
            listView.Columns.Add("first", 35);
            listView.Columns.Add("second", 75);

            for (int i = 0; i < 5; i++)
            {
                listView.Items.Add("test");
                listView.Items[i].SubItems.Add("test test test test");
            }
        }

        #region from Form1.Designer
        /// <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.listView1 = new System.Windows.Forms.ListView();
            this.listView2 = new System.Windows.Forms.ListView();
            this.listView3 = new System.Windows.Forms.ListView();
            this.listView4 = new System.Windows.Forms.ListView();
            this.SuspendLayout();
            // 
            // listView1
            // 
            this.listView1.Location = new System.Drawing.Point(12, 12);
            this.listView1.Name = "listView1";
            this.listView1.Size = new System.Drawing.Size(121, 116);
            this.listView1.TabIndex = 0;
            this.listView1.UseCompatibleStateImageBehavior = false;
            this.listView1.View = System.Windows.Forms.View.Details;
            // 
            // listView2
            // 
            this.listView2.Font = new System.Drawing.Font("Microsoft Sans Serif", 
                                       8.25F, System.Drawing.FontStyle.Bold,
                                       System.Drawing.GraphicsUnit.Point, 
                                       ((byte)(0)));
            this.listView2.Location = new System.Drawing.Point(151, 12);
            this.listView2.Name = "listView2";
            this.listView2.Size = new System.Drawing.Size(121, 116);
            this.listView2.TabIndex = 1;
            this.listView2.UseCompatibleStateImageBehavior = false;
            this.listView2.View = System.Windows.Forms.View.Details;
            // 
            // listView3
            // 
            this.listView3.Location = new System.Drawing.Point(12, 134);
            this.listView3.Name = "listView3";
            this.listView3.OwnerDraw = true;
            this.listView3.Size = new System.Drawing.Size(121, 116);
            this.listView3.TabIndex = 2;
            this.listView3.UseCompatibleStateImageBehavior = false;
            this.listView3.View = System.Windows.Forms.View.Details;
            this.listView3.DrawSubItem += new 
                          System.Windows.Forms.DrawListViewSubItemEventHandler(
                          this.ListViewDrawSubItem);
            // 
            // listView4
            // 
            this.listView4.Font = new System.Drawing.Font("Microsoft Sans Serif", 
                                       8.25F, System.Drawing.FontStyle.Bold,
                                       System.Drawing.GraphicsUnit.Point, 
                                       ((byte)(0)));
            this.listView4.Location = new System.Drawing.Point(151, 134);
            this.listView4.Name = "listView4";
            this.listView4.OwnerDraw = true;
            this.listView4.Size = new System.Drawing.Size(121, 116);
            this.listView4.TabIndex = 3;
            this.listView4.UseCompatibleStateImageBehavior = false;
            this.listView4.View = System.Windows.Forms.View.Details;
            this.listView4.DrawSubItem += new 
                          System.Windows.Forms.DrawListViewSubItemEventHandler(
                          this.ListViewDrawSubItem);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 262);
            this.Controls.Add(this.listView4);
            this.Controls.Add(this.listView3);
            this.Controls.Add(this.listView2);
            this.Controls.Add(this.listView1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.ListView listView1;
        private System.Windows.Forms.ListView listView2;
        private System.Windows.Forms.ListView listView3;
        private System.Windows.Forms.ListView listView4;
        #endregion

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}
4

1 回答 1

9

我找到了 draw sub item 方法的偶然实现。我的主要警告是选项卡大小是固定的（尽管如果需要更改它，我可以降到 win32）；据报道，在我的机器上工作时我需要的标志组合在 MSDN 中是相互不兼容的。

private void ListViewDrawSubItem(object sender, DrawListViewSubItemEventArgs e)
{
    //toggle colors if the item is highlighted 
    if (e.Item.Selected && e.Item.ListView.Focused)
    {
        e.SubItem.BackColor = SystemColors.Highlight;
        e.SubItem.ForeColor = e.Item.ListView.BackColor;
    }
    else if (e.Item.Selected && !e.Item.ListView.Focused)
    {
        e.SubItem.BackColor = SystemColors.Control;
        e.SubItem.ForeColor = e.Item.ListView.ForeColor;
    }
    else
    {
        e.SubItem.BackColor = e.Item.ListView.BackColor;
        e.SubItem.ForeColor = e.Item.ListView.ForeColor;
    }

    // Draw the standard header background.
    e.DrawBackground();
        
    //add a 2 pixel buffer the match default behavior
    Rectangle rec = new Rectangle(e.Bounds.X + 2, e.Bounds.Y+2, 
                                  e.Bounds.Width - 4, e.Bounds.Height-4);

    //TODO  Confirm combination of TextFormatFlags.EndEllipsis and 
    //TextFormatFlags.ExpandTabs works on all systems.  MSDN claims they're 
    //exclusive but on Win7-64 they work.
    TextFormatFlags flags = TextFormatFlags.Left | TextFormatFlags.EndEllipsis | 
                            TextFormatFlags.ExpandTabs |
                            TextFormatFlags.SingleLine;

    //If a different tab stop than the default is needed, will have to p/invoke 
    //DrawTextEx from win32.
    TextRenderer.DrawText(e.Graphics, e.SubItem.Text, e.Item.ListView.Font, rec, 
                          e.SubItem.ForeColor, flags);
}
于 2011-12-06T20:15:36.253 回答