C# WinForms 中的自定义绘制拆分器控件

Custom paint Splitter control in C# WinForms

我正在尝试绘制当您拖动拆分器控件时出现的拆分线:

从这张图片可以看出,默认的分割线是棋盘格。

...这行不通:

public partial class MockForm : Form
{
    public MockForm()
    {
        InitializeComponent();
        this.splitter1.Paint += splitter1_Paint;
    }

    private void splitter1_Paint(object sender, PaintEventArgs e)
    {
        e.Graphics.Clear(Color.Red);
    }
}

这只会绘制控件的背景,但不会在拖动时绘制拆分器。

有什么想法吗?

旧的 Splitter 控件使用私有绘制方法来产生棋盘效果,因此您无法覆盖任何东西来替换它。

您可以通过在屏幕上看到的棋盘控件的 space 中拖动您自己的控件来伪造它。这可能会产生一些闪烁:

Control draggingControl = new Control { BackColor = Color.Green, Visible = false };

public MockForm() {
  InitializeComponent();
  this.Controls.Add(draggingControl);
  splitter1.SplitterMoving += splitter1_SplitterMoving;
  splitter1.SplitterMoved += splitter1_SplitterMoved;
}

void splitter1_SplitterMoving(object sender, SplitterEventArgs e) {
  draggingControl.Bounds = new Rectangle(new Point(e.X - (e.X - e.SplitX), 0),
                                         splitter1.Size);
  if (!draggingControl.Visible) {
    draggingControl.Visible = true;
    draggingControl.BringToFront();
  }
  this.Refresh();
}

void splitter1_SplitterMoved(object sender, SplitterEventArgs e) {
  draggingControl.Visible = false;
  this.Refresh();
}

Splitter 控件已被弃用,取而代之的是 SplitContainer 控件。

LarsTech 提供的 post 答案非常好,但处理程序闪烁有点烦人。如果您将 Form 显示为拆分器处理程序并将其显示在拆分器的容器上方,而不是在 Form 中显示控件,则闪烁将消失。

HighLight f = new HighLight() { BackColor = Color.Red };
private void splitter1_SplitterMoving(object sender, SplitterEventArgs e)
{
    this.splitter1.Parent.Refresh();
    f.Location = this.splitter1.Parent.PointToScreen(new Point(e.SplitX, e.SplitY));
    f.Size = this.splitter1.Size;
    if (!f.Visible)
        f.ShowInactiveTopmost();
}
private void splitter1_SplitterMoved(object sender, SplitterEventArgs e)
{
    f.Hide();
}

这是我用作突出显示的表格:

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
public class HighLight : Form
{
    public HighLight()
    {
        Opacity = 0;
        FormBorderStyle = FormBorderStyle.None;
        ShowInTaskbar = false;
        StartPosition = FormStartPosition.Manual;
    }
    protected override void OnDeactivate(EventArgs e)
    {
        base.OnDeactivate(e);
        this.Hide();
    }
    private const int SW_SHOWNOACTIVATE = 4;
    private const int HWND_TOPMOST = -1;
    private const uint SWP_NOACTIVATE = 0x0010; 
    [DllImport("user32.dll", EntryPoint = "SetWindowPos")]
    static extern bool SetWindowPos(int hWnd, int hWndInsertAfter,
         int X, int Y, int cx, int cy, uint uFlags);
    [DllImport("user32.dll")]
    static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
    public void ShowInactiveTopmost()
    {
        ShowWindow(this.Handle, SW_SHOWNOACTIVATE);
        SetWindowPos(this.Handle.ToInt32(), HWND_TOPMOST,
        this.Left, this.Top, this.Width, this.Height,
        SWP_NOACTIVATE);
        this.Opacity = 1;
    }
}

要查看支持透明处理程序的自定义拆分器,请查看相关的 post。在另一个 post 中,我使用原始拆分器的源代码创建了一个新的拆分器控件,但更改了突出显示的渲染: