Question

我想知道如何在TextBox中为选定的文本实现自定义背景。默认情况下，它使用窗口的标准颜色选择文本（浅蓝色）。由于我使用的是基于winforms TextBox的蒙皮文本编辑器，而TextBox没有公开任何属性来更改颜色，我想知道是否还有其他方法可以在应用程序级别更改此系统默认颜色？ / p>

谢谢，

汤姆

Answer 1

也许这有帮助...

public class MyTextBox : System.Windows.Forms.TextBox
    {
        private const int WM_PAINT = 0x000F;

        public MyTextBox()
        {
            this.TextChanged += new System.EventHandler(this.myTextBox_TextChanged);

        }

        private void myTextBox_TextChanged(object sender, System.EventArgs e)
        {
        }


        [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]    
        protected override void WndProc(ref Message m) 
        {
            base.WndProc(ref m);    
            // Listen for operating system messages.
            switch (m.Msg)
            {
                case WM_PAINT:
                    PaintEventArgs pe = new PaintEventArgs(this.CreateGraphics(),this.RectangleToScreen(this.ClientRectangle));
                    this.OnPaint(pe);
                    break;
            }

        }

        protected override void OnPaint(PaintEventArgs pe)
        {
    // call base.OnPaint(pe);
            Graphics g = pe.Graphics;
            g.Clear(this.BackColor);
            string s = this.Text.Substring(0,this.Text.Length/2);
   // provide a object with how to split your string with colors
            string s1 =  this.Text.Substring(this.Text.Length/2);
            SizeF sf = g.MeasureString(s,this.Font);
            g.DrawString(s,this.Font,new SolidBrush(Color.Red),0,0);

            g.DrawString(s1,this.Font,new SolidBrush(Color.Black),sf.Width,0);
        }
    }

在TextBox中更改选定的Text BackColor

1 个答案: