如何在不将Dock设置为Fill的情况下将Label置于Panel内部

Question

我试图创建一个带有边框的自定义面板,其颜色可以更改,以便在某些条件下"突出显示"面板.

小组还需要通过案文传达某些信息.为此,我在Panel中添加了一个Label.我已尝试使用规定的方法对Label进行居中,但出于某种原因,它始终将其放在Panel的左上角.我无法将Label的Dock设置为Fill,因为它掩盖了已创建的自定义边框.所以我需要做到这一点,以便Label适合边框.

Label的Anchor设置为None,其位置为

new Point((ClientSize.Width - Size.Width)/2, (ClientSize.Height - Size.Height)/2);

自定义Panel的代码是:

public class CustomPanel : Panel
{
    public CustomPanel(int borderThickness, Color borderColor) : base()
    {
        SetStyle(ControlStyles.AllPaintingInWmPaint | 
                 ControlStyles.UserPaint | 
                 ControlStyles.OptimizedDoubleBuffer | 
                 ControlStyles.ResizeRedraw, true);

        BackColor = SystemColors.ActiveCaption;
        BorderStyle = BorderStyle.FixedSingle;
        Size = new Size(45, 45);
        Margin = new Padding(0);
        BorderThickness = borderThickness;
        BorderColor = borderColor;
    }

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

        if (BorderStyle == BorderStyle.FixedSingle)
        {
            int halfThickness = BorderThickness / 2;
            using (Pen p = new Pen(BorderColor, BorderThickness))
            {
                e.Graphics.DrawRectangle(p, new Rectangle(halfThickness,
                     halfThickness,
                     ClientSize.Width - BorderThickness, ClientSize.Height - BorderThickness));
            }
        }
    }

    public int BorderThickness { get; set; }
    public Color BorderColor { get; set; }
}

表格代码是:

private void NewPanelTest_Load(object sender, EventArgs e)
{
    CustomPanel cp = new CustomPanel(3, Color.Black);

    // Create new Label
    Label info = new Label()
    {
        Size = new Size(30, 30),
        Text = "Info",
        Anchor = AnchorStyles.None,
        TextAlign = ContentAlignment.MiddleCenter,
        Enabled = false,
        Font = new Font("Microsoft Sans Serif", 6),
        ForeColor = Color.White,
        Location = new Point(ClientSize.Width/2 - Width/2, ClientSize.Height/2 - Height/2)
    };

    cp.Controls.Add(info);

    this.Controls.Add(cp);
}

编辑:我看过类似的问题并尝试更改Label的属性,但没有结果.

// Create new Label
Label info = new Label()
{
    // Same code as before

    // Different code
    Left = (this.ClientSize.Width - Size.Width) / 2,
    Top = (this.ClientSize.Height - Size.Height) / 2,
    //Location = new Point(ClientSize.Width/2 - Width/2, ClientSize.Height/2 - Height/2)
};

我也试过更改Panel的Padding,也没有结果.

Padding = new Padding(5);

编辑:尝试以编程方式将Label放置在Panel的中心(产生X = 0,Y = 0的结果)

// Create new Label
Label info = new Label()
{
    // Same code as before (excluding "Left", "Top", and "Location")
};
int X = (info.ClientSize.Width - info.Width) / 2;
int Y = (info.ClientSize.Height - info.Height) / 2;
info.Location = new Point(X, Y);
MessageBox.Show(info.Location.ToString());

cp.Controls.Add(info);

Answer 1

我们可以通过简单的步骤实现这一目标

• 将标签锚设置为左右
• 将Label AutoSize设置为false;
• 将Label TextAlign设置为MiddleCenter;

现在将标签置于面板中间.

   int x = (panel1.Size.Width - label1.Size.Width) / 2;
    label1.Location = new Point(x, label1.Location.Y);