c# - 如何在winforms中使分组框文本居中？

Question

我正在使用一个组框，里面有几个控件。

我的要求是将组框标题设置到组框的中间而不是左侧。

如何？

Answer 1

您可以像这样扩展组框类。

 public class CustomGrpBox : GroupBox
    {
        private string _Text = "";
        public CustomGrpBox()
        {
            //set the base text to empty 
            //base class will draw empty string
            //in such way we see only text what we draw
            base.Text = "";
        }
        //create a new property a
        [Browsable(true)]
        [Category("Appearance")]
        [DefaultValue("GroupBoxText")]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public new string Text
        {
            get
            {

                return _Text;
            }
            set
            {

                _Text = value;
                this.Invalidate();
            }
        }
        protected override void OnPaint(PaintEventArgs e)
        {

              //first let the base class to draw the control 
              base.OnPaint(e);
              //create a brush with fore color
              SolidBrush colorBrush = new SolidBrush(this.ForeColor);
              //create a brush with back color
              var backColor = new SolidBrush(this.BackColor);
              //measure the text size
              var size = TextRenderer.MeasureText(this.Text, this.Font);
              // evaluate the postiong of text from left;
              int left = (this.Width - size.Width) / 2;
              //draw a fill rectangle in order to remove the border
              e.Graphics.FillRectangle(backColor, new Rectangle(left, 0, size.Width, size.Height));
              //draw the text Now
              e.Graphics.DrawString(this.Text, this.Font, colorBrush, new PointF(left, 0));

        }
    }

将上面的类添加到您的项目中，并使用“CustomGrpBox”而不是“GroupBox”，后者将在您的工具箱中构建后创建。

并且您可以像这样随时设置文本。

private void Form2_Load(object sender, EventArgs e)
    {
        customGrpBox1.Text = "Hello World";
    }

在设计时 Visual Studio 中看起来像这样