.net - 将按钮控件添加到 SplitContainer Splitter

Question

有没有办法在 .NET SplitContainer 中的两个面板之间显示的可调节拆分器上显示控件(如按钮)？

示例:

我不认为 SplitContainer 本身支持这一点，但是重写控件来获得这个在许多应用程序中似乎无处不在的功能对我来说似乎有点太多了 - 我觉得我已经结束了-这样想或遗漏了一些明显的东西。

Answer 1

下面是一个使用 TableLayoutPanel 模拟 SplitContainer 的示例。

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

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

    TableLayoutPanel rootPanel;
    float originalWidth;
    int splitPointX;

    public Form1()
    {
        Controls.Add(rootPanel = new TableLayoutPanel
        {
            ColumnCount = 3,
            ColumnStyles =
            {
                // Notice the use of Absolute here as this will control the 'splitting'
                new ColumnStyle(SizeType.Absolute, 120F),
                // Size of button panel
                new ColumnStyle(SizeType.AutoSize),
                // Remaining size
                new ColumnStyle(SizeType.Percent, 100F),
            },
            Dock = DockStyle.Fill,
            RowCount = 1,
            RowStyles = { new RowStyle(SizeType.Percent, 100F) },
        });

        Panel buttonPanel;
        rootPanel.Controls.Add(buttonPanel = new Panel
        {
            Anchor = AnchorStyles.Top | AnchorStyles.Bottom,
            BackColor = SystemColors.ControlDark,
            Margin = new Padding(0),
            MinimumSize = new Size(80, 0),
            Size = new Size(80, 0),
            Controls =
            {
                // UseVisualStyleBackColor = true only because we altered the container's BackColor
                new Button { Text = ">>", Location = new Point(19, 112), Size = new Size(40, 23), UseVisualStyleBackColor = true },
                new Button { Text = ">", Location = new Point(19, 83), Size = new Size(40, 23), UseVisualStyleBackColor = true },
                new Button { Text = "<", Location = new Point(19, 54), Size = new Size(40, 23), UseVisualStyleBackColor = true },
                new Button { Text = "<<", Location = new Point(19, 25), Size = new Size(40, 23), UseVisualStyleBackColor = true },
            },
        }, 1, 0);

        buttonPanel.MouseDown += (s, e) =>
            {
                if (e.Button == MouseButtons.Left)
                {
                    // Capture mouse so that all mouse move messages go to this control
                    (s as Control).Capture = true;

                    // Record original column width
                    originalWidth = rootPanel.ColumnStyles[0].Width;

                    // Record first clicked point
                    // Convert to screen coordinates because this window will be a moving target
                    Point windowPoint = (s as Control).PointToScreen(e.Location);
                    splitPointX = windowPoint.X;
                }
            };
        buttonPanel.MouseMove += (s, e) =>
            {
                if ((s as Control).Capture)
                {
                    Point windowPoint = (s as Control).PointToScreen(e.Location);

                    // Calculate distance of mouse from splitPoint
                    int offset = windowPoint.X - splitPointX;

                    // Apply to originalWidth
                    float newWidth = originalWidth + offset;

                    // Clamp it.
                    // The control in the left pane's MinimumSize.Width would be more appropriate than zero
                    newWidth = Math.Max(0, newWidth);

                    // Update column width
                    if (Math.Abs(newWidth - rootPanel.ColumnStyles[0].Width) >= 1)
                        rootPanel.ColumnStyles[0].Width = newWidth;
                }
            };
        buttonPanel.MouseUp += (s, e) =>
            {
                if (e.Button == MouseButtons.Left)
                {
                    // Release mouse capture
                    if ((s as Control).Capture)
                        (s as Control).Capture = false;
                }
            };
    }
}