Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Panel: no dotted-line border in design time?

Posted on 2002-06-27
4
Medium Priority
?
1,315 Views
Last Modified: 2012-06-21
Hello,

I'm trying to write a visual component (BorderPanel) that extends the System.Windows.Forms.Panel because I want to have more options for the BorderType property.
This works fine. However during design time, the designer for the System.Windows.Forms.Panel object always draws a dotted-line border around the panel (the reason is that a normal panel doesn't have a border and can not be distinguished on the form otherwise; the dotted line shows the designer where the panel is placed). Can anyone give me some example code how I must override the designer so it does NOT draw the dotted line (because my panel does already have a border).

Thanks,
Bart.
0
Comment
Question by:bartie
4 Comments
 
LVL 22

Expert Comment

by:CJ_S
ID: 7113134
This is default for any component you create. AFAIk you cannot change that.

CJ
0
 

Author Comment

by:bartie
ID: 7113602
No, you really are able to change design time attributes. Meanwhile I found how to do it on www.syncfusion.com. My problem was that I didn't know I had to add a reference (Project -> Add Reference...) to System.Design.Dll. The following example draws a BLUE dotted border in case the panel border is not visible. Off course the code could be changed to not drawing a border. In the OnPaintAdornments you can e.g. also write code to draw some design time things which are not visible in runtime.

Thanks anyway.

using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.ComponentModel;

namespace TestDesigner
{
[Designer(typeof(BorderPanel.BorderPanelDesigner))]
public class BorderPanel : System.Windows.Forms.Panel
{
 internal class BordererPanelDesigner:ParentControlDesigner
 {
 protected override void OnPaintAdornments
                                      (PaintEventArgs pe)
 {
 System.Windows.Forms.Panel panel;
 panel = (System.Windows.Forms.Panel)this.Component;
 if (panel.BorderStyle == BorderStyle.None)
   this.DrawDesignTimeBorder(pe.Graphics, panel);          
 base.OnPaintAdornments(pe);
 }
 
 public void DrawDesignTimeBorder
                           (Graphics g, Control control)
 {
 System.Drawing.Rectangle clientRectangle;
 System.Drawing.Color bgColor, adjustedBgColor;
 System.Drawing.Pen pen;
 clientRectangle = control.ClientRectangle;
 bgColor = control.BackColor;
 if (((double) bgColor.GetBrightness()) >= 0.5)
  adjustedBgColor = ControlPaint.Dark(control.BackColor);
 else
  adjustedBgColor = ControlPaint.Light(control.BackColor);
 pen = new Pen(adjustedBgColor);
 pen.DashStyle = DashStyle.Dash;
 pen.Color=Color.Blue;
 clientRectangle.Width = (clientRectangle.Width - 1);
 clientRectangle.Height = (clientRectangle.Height - 1);
 g.DrawRectangle(pen,clientRectangle);
 pen.Dispose();
 }
}

//TODO: the implementation of the class BorderPanel itself.

}        
0
 
LVL 49

Expert Comment

by:DanRollins
ID: 7152100
hi bartie,
This is useful information.  Since you solved the problem yourself, I recommend that you ask Community Support to refund your points and to save this in the PAQ.  To post a question to CS, click here: http://www.experts-exchange.com/jsp/qAskQuestion.jsp?ta=commspt
-- Dan
0
 
LVL 6

Accepted Solution

by:
Mindphaser earned 400 total points
ID: 7154139
Points refunded and moved to PAQ

** Mindphaser - Community Support Moderator **
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article is for Object-Oriented Programming (OOP) beginners. An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
this video summaries big data hadoop online training demo (http://onlineitguru.com/big-data-hadoop-online-training-placement.html) , and covers basics in big data hadoop .
Look below the covers at a subform control , and the form that is inside it. Explore properties and see how easy it is to aggregate, get statistics, and synchronize results for your data. A Microsoft Access subform is used to show relevant calcul…
Suggested Courses

971 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question