C # modify the border color of the Form Control GroupBox,

C # modify the border color of the Form Control GroupBox,

The default border color of the control Group Box is white, which is usually less prominent. However, the default attribute list does not provide corresponding interfaces. Therefore, you can only redraw events.

The OnPaint event is widely used on the Internet, but it is not found in the event list. It should be hidden too deeply (it needs to be rewritten with the override keyword ). I used the Paint event directly here, and it can also achieve its effect.

Thanks http://blog.csdn.net/haoduo123456789001/article/details/51083223

    public partial class TestForm : Form    {        public TestForm()        {            InitializeComponent();            this.groupBox1.Paint += groupBox_Paint;            this.groupBox2.Paint += groupBox_Paint;        }        void groupBox_Paint(object sender, PaintEventArgs e)        {            GroupBox gBox = (GroupBox)sender;            e.Graphics.Clear(gBox.BackColor);            e.Graphics.DrawString(gBox.Text, gBox.Font, Brushes.Red, 10, 1);            var vSize = e.Graphics.MeasureString(gBox.Text, gBox.Font);            e.Graphics.DrawLine(Pens.Red, 1, vSize.Height / 2, 8, vSize.Height / 2);            e.Graphics.DrawLine(Pens.Red, vSize.Width + 8, vSize.Height / 2, gBox.Width - 2, vSize.Height / 2);            e.Graphics.DrawLine(Pens.Red, 1, vSize.Height / 2, 1, gBox.Height - 2);            e.Graphics.DrawLine(Pens.Red, 1, gBox.Height - 2, gBox.Width - 2, gBox.Height - 2);            e.Graphics.DrawLine(Pens.Red, gBox.Width - 2, vSize.Height / 2, gBox.Width - 2, gBox.Height - 2);         }        private void TestForm_Load(object sender, EventArgs e)        {                    }    }

 

:

Of course, if you want to, please refer to the following method using OnPaint.

First, you need to create your own components (similar to custom controls ):

After adding the code, switch to "Code view ".

Modify the inheritance relationship:

Public partial class MyGroupBox: GroupBox // Component {public MyGroupBox () {InitializeComponent ();} public MyGroupBox (IContainer container) {container. Add (this); InitializeComponent ();}
// Rewrite}

Then rewrite the OnPaint () method:

// Override protected override void OnPaint (PaintEventArgs e) {var vSize = e. graphics. measureString (this. text, this. font); e. graphics. clear (this. backColor); e. graphics. drawString (this. text, this. font, new SolidBrush (this. foreColor), 10, 1); e. graphics. drawLine (Pens. black, 1, vSize. height/2, 8, vSize. height/2); e. graphics. drawLine (Pens. black, vSize. width + 8, vSize. height/2, this. width-2, vSize. height/2); e. graphics. drawLine (Pens. black, 1, vSize. height/2, 1, this. height-2); e. graphics. drawLine (Pens. black, 1, this. height-2, this. width-2, this. height-2); e. graphics. drawLine (Pens. black, this. width-2, vSize. height/2, this. width-2, this. height-2 );}

Press F6 to generate it, and you can find it in the toolbar. Then, you don't need to use the previous GroupBox. Once and for all

You can even expose the border color by using the control property.

Public partial class MyGroupBox: GroupBox // Component {private Color mBorderColor = Color. Black;
[Browsable (true), Description ("border Color"), Category ("Custom group")] public Color BorderColor {get {return mBorderColor ;} set {mBorderColor = value ;}} public MyGroupBox () {InitializeComponent ();} public MyGroupBox (IContainer container) {container. add (this); InitializeComponent () ;}// rewrite protected override void OnPaint (PaintEventArgs e) {var vSize = e. graphics. measureString (this. text, this. font); e. graphics. clear (this. backColor); e. graphics. drawString (this. text, this. font, new SolidBrush (this. foreColor), 10, 1); Pen vPen = new Pen (this. mBorderColor); // use the attribute color to draw the border color e. graphics. drawLine (vPen, 1, vSize. height/2, 8, vSize. height/2); e. graphics. drawLine (vPen, vSize. width + 8, vSize. height/2, this. width-2, vSize. height/2); e. graphics. drawLine (vPen, 1, vSize. height/2, 1, this. height-2); e. graphics. drawLine (vPen, 1, this. height-2, this. width-2, this. height-2); e. graphics. drawLine (vPen, this. width-2, vSize. height/2, this. width-2, this. height-2 );}}

 

 

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