如何在SplitContainer的拆分器中添加抓取句柄

不是说我反对亚历克斯的回答,但我想我会把这个解决方案 看 对我好一点(在XP机器上?).

private void SplitContainer_Paint(object sender, PaintEventArgs e)
{
    var control = sender as SplitContainer;
    //paint the three dots'
    Point[] points = new Point[3];
    var w = control.Width;
    var h = control.Height;
    var d = control.SplitterDistance;
    var sW = control.SplitterWidth;

    //calculate the position of the points'
    if (control.Orientation == Orientation.Horizontal)
    {
        points[0] = new Point((w / 2), d + (sW / 2));
        points[1] = new Point(points[0].X - 10, points[0].Y);
        points[2] = new Point(points[0].X + 10, points[0].Y);
    }
    else
    {
        points[0] = new Point(d + (sW / 2), (h / 2));
        points[1] = new Point(points[0].X, points[0].Y - 10);
        points[2] = new Point(points[0].X, points[0].Y + 10);
    }

    foreach (Point p in points)
    {
        p.Offset(-2, -2);
        e.Graphics.FillEllipse(SystemBrushes.ControlDark,
            new Rectangle(p, new Size(3, 3)));

        p.Offset(1, 1);
        e.Graphics.FillEllipse(SystemBrushes.ControlLight,
            new Rectangle(p, new Size(3, 3)));
    }
}

希望这能取悦别人?哈!

这还没有实现。如果您喜欢这个特性,最好派生SplitContainer并重写OnPaint方法。

更新1

这里有一些代码可以满足您的要求。它在VB.NET中,点的位置可以做一些调整。总的来说,代码工作正常。

Imports System.Windows.Forms
Imports System.ComponentModel
Imports System.Drawing

Public Class SplitContainerEx
    Inherits SplitContainer

    ''' <summary>Determines the thickness of the splitter.</summary>
    <DefaultValue(GetType(Integer), "5"), Description("Determines the thickness of the splitter.")> _
           Public Overridable Shadows Property SplitterWidth() As Integer
        Get
            Return MyBase.SplitterWidth
        End Get
        Set(ByVal value As Integer)
            If value < 5 Then value = 5

            MyBase.SplitterWidth = value
        End Set
    End Property

    Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
        MyBase.OnPaint(e)
        'paint the three dots
        Dim points(2) As Point
        Dim pointRect = Rectangle.Empty

        'calculate the position of the points
        If Orientation = Windows.Forms.Orientation.Horizontal Then
            points(0) = New Point((MyBase.Width \ 2), SplitterDistance + (SplitterWidth \ 2))
            points(1) = New Point(points(0).X - 10, points(0).Y)
            points(2) = New Point(points(2).X + 10, points(0).Y)
            pointRect = New Rectangle(points(1).X - 2, points(1).Y - 2, 25, 5)
        Else
            points(0) = New Point(SplitterDistance + (SplitterWidth \ 2), (MyBase.Height \ 2))
            points(1) = New Point(points(0).X, points(0).Y - 10)
            points(2) = New Point(points(0).X, points(0).Y + 10)
            pointRect = New Rectangle(points(1).X - 2, points(1).Y - 2, 5, 25)
        End If

        e.Graphics.FillRectangle(Brushes.Gray, pointRect)

        For Each p In points
            p.Offset(-1, -1)
            e.Graphics.FillEllipse(Brushes.Black, New Rectangle(p, New Size(3, 3)))
        Next
    End Sub
End Class

更新2

我之所以提出C#等价物,是因为你把你的问题标成了C#等价物。
如果 vb makes you sick ,学会面对 Convert VB.NET to C# - Developer Fusion 并进行VB到C的转换。

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

public class SplitContainerEx : SplitContainer
{

    /// <summary>Determines the thickness of the splitter.</summary>
    [DefaultValue(typeof(int), "5"), Description("Determines the thickness of the splitter.")]
    public virtual new int SplitterWidth {
        get { return base.SplitterWidth; }
        set {
            if (value < 5)
                value = 5;

            base.SplitterWidth = value;
        }
    }

    protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
    {
        base.OnPaint(e);
        //paint the three dots
        Point[] points = new Point[3];
        Rectangle pointRect = Rectangle.Empty;

        //calculate the position of the points
        if (Orientation == System.Windows.Forms.Orientation.Horizontal) {
            points[0] = new Point((int)(base.Width / 2), SplitterDistance + (int)(SplitterWidth / 2));
            points[1] = new Point(points[0].X - 10, points[0].Y);
            points[2] = new Point(points[2].X + 10, points[0].Y);
            pointRect = new Rectangle(points[1].X - 2, points[1].Y - 2, 25, 5);
        } else {
            points[0] = new Point(SplitterDistance + (int)(SplitterWidth / 2), (int)(base.Height / 2));
            points[1] = new Point(points[0].X, points[0].Y - 10);
            points[2] = new Point(points[0].X, points[0].Y + 10);
            pointRect = new Rectangle(points[1].X - 2, points[1].Y - 2, 5, 25);
        }

        e.Graphics.FillRectangle(Brushes.Gray, pointRect);

        foreach (Point p in points) {
            p.Offset(-1, -1);
            e.Graphics.FillEllipse(Brushes.Black, new Rectangle(p, new Size(3, 3)));
        }
    }
}

如果你不亲自粉刷的话,你最接近的就是 BorderStyle 到 Fixed3D . 在两个面板之间会有一个“条”。

如果您不喜欢这两个面板本身的凹陷外观,您可以通过将分割面板放在另一个面板的内部并设置其 Location 到负值(例如。 -n,-n )其大小与其父面板大小相同+ 2*n . 然后我把锚定在 Top | Left | Bottom | Right 以便在调整父面板的大小时保持这种方式。

这是一种混乱,但我确实考虑过做一些我讨厌的事,没有迹象表明“抓捕点”在哪里。

我喜欢shousper和Alex的答案,但对我来说,它们似乎有点“复杂”;似乎有更多的代码是我认为有必要的。

Shaun的答案也有效(我在MSDN中也发现了这个),但是在我正在开发的应用程序中,“抓取手柄”变得非常分散注意力,因为它们几乎填满了拆分器,我们有很多。

所以我想到了这个,介于两者之间。没有数组,没有新的矩形。从“接受的”答案来看,对“3D”效果来说,只需要很少的额外工作,但3个简单的点对我来说很有用:

protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
    base.OnPaint(e);

    Point centerPoint = new Point(SplitterRectangle.Left - 1 + SplitterRectangle.Width / 2, SplitterRectangle.Top - 1 + SplitterRectangle.Height / 2);

    e.Graphics.FillEllipse(SystemBrushes.ControlText, centerPoint.X, centerPoint.Y, 3, 3);
    if (Orientation == System.Windows.Forms.Orientation.Horizontal) {
        e.Graphics.FillEllipse(SystemBrushes.ControlText, centerPoint.X - 10, centerPoint.Y, 3, 3);
        e.Graphics.FillEllipse(SystemBrushes.ControlText, centerPoint.X + 10, centerPoint.Y, 3, 3);
    } else {
        e.Graphics.FillEllipse(SystemBrushes.ControlText, centerPoint.X, centerPoint.Y - 10, 3, 3);
        e.Graphics.FillEllipse(SystemBrushes.ControlText, centerPoint.X, centerPoint.Y + 10, 3, 3);
    }
}

我真的不想在写内部管理工具的时候做所有的抓取手柄的工作,这太过分了。根据 this article on MSDN 您可以对SplitContainer进行子类划分,覆盖OnPaint(PaintEventArgs)方法并包含以下行:

ControlPaint.DrawGrabHandle(e.Graphics, SplitterRectangle, true, Enabled);

这将在窗格之间画一条基本的分界线。

我更喜欢的是添加一个绘画处理程序。这意味着您不需要派生一个新类,如果将静态函数放入一个可由不同项目共享的文件中,则该静态函数很容易重用—只需记住使用“add as link”,这样,如果您编辑了该文件,则将对包含该文件的所有项目进行更改。它的主要缺点是不能自动处理控件颜色的更改。

...
mySplitContainer.Paint += CustomPaint.PaintSplitterWithHandle;
...

public static class CustomPaint {
  public static void PaintSplitterWithHandle(object sender, PaintEventArgs p) {
    SplitContainer splitter = sender as SplitContainer;
    if (splitter == null) return;
    if (splitter.Orientation == Orientation.Horizontal)
        p.Graphics.DrawLine(Pens.DarkGray, 
           0, splitter.SplitterDistance + (splitter.SplitterWidth / 2),
           splitter.Width, splitter.SplitterDistance + (splitter.SplitterWidth / 2));
    else
        p.Graphics.DrawLine(Pens.DarkGray, 
            splitter.SplitterDistance + (splitter.SplitterWidth / 2), 0,
            splitter.SplitterDistance + (splitter.SplitterWidth / 2), splitter.Height);
  }
}