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Sep 25th, 2009

Controls added to panel are moving down when repainted

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I have a Panel on a form to which i have added a selection of controls with (x,y) coordinates.

The panel has Autoscroll enabled. If there are enough controls to require a scrollbar, and the bar has been scrolled down when the paint event fires, the controls all move down when the panel paints.

Each time this process is repeated the controls are shuffled down. This results in a gap at the top of the panel : /

I have checked through debugging and the coordinates arent changing so the control is still at (25, 25) but now (25,25) is further down the panel : / Im really stumped on this one. Can anyone shed some light?

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Ryshad

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Sep 25th, 2009

Re: Controls added to panel are moving down when repainted

Can you post your code? This probably depends on the implementation of scrollbars in the panel

sknake

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Sep 25th, 2009

Re: Controls added to panel are moving down when repainted

C# Syntax (Toggle Plain Text)
private const int Pad = 25;
 
private void PaintMessages()
        {
            Point CurrentPoint = panel1.AutoScrollPosition; 
            panel1.SuspendLayout();
            panel1.Controls.Clear();
            CurrentY = 0;
            for (int i = 0; i < Messages.Count; i++)
            {
                int offset = ((panel1.Width - (2 * Pad)) / 3);
 
                ControlTitleBar title = new ControlTitleBar(Messages[i].ID);
                WebBrowser browser = new WebBrowser();
                browser.DocumentText = Messages[i].Content;
                title.isFlagged = Messages[i].isFlagged;
                title.FlagClicked += new btnFlagClickedHandler(title_FlagClicked);
                browser.Width = 2 * offset;
                title.Width = 2 * offset;
                browser.Height = browser.GetPreferredSize(new Size(2 * offset, 0)).Height; //this does NOT work with Webbrowsers...solution needed
 
                Point loc;
                if (Messages[i].Type == MessageType.Received)
                {
                    loc = new Point(Pad, CurrentY + Pad);
                    if (ReplyToId == "")
                        ReplyToId = Messages[i].ExternalID;
                }
                else
                {
                    loc = new Point(Pad + offset, CurrentY + Pad);
                }
 
                title.Location = loc;
                loc.Y += title.Height;
                browser.Location = loc;
                panel1.Controls.Add(browser);
                panel1.Controls.Add(title);
                CurrentY = browser.Location.Y + browser.Height;
            }
            panel1.AutoScrollPosition = new Point(Math.Abs(panel1.AutoScrollPosition.X), Math.Abs(CurrentPoint.Y)); 
            panel1.ResumeLayout();
        }
private const int Pad = 25;

private void PaintMessages()
        {
            Point CurrentPoint = panel1.AutoScrollPosition; 
            panel1.SuspendLayout();
            panel1.Controls.Clear();
            CurrentY = 0;
            for (int i = 0; i < Messages.Count; i++)
            {
                int offset = ((panel1.Width - (2 * Pad)) / 3);

                ControlTitleBar title = new ControlTitleBar(Messages[i].ID);
                WebBrowser browser = new WebBrowser();
                browser.DocumentText = Messages[i].Content;
                title.isFlagged = Messages[i].isFlagged;
                title.FlagClicked += new btnFlagClickedHandler(title_FlagClicked);
                browser.Width = 2 * offset;
                title.Width = 2 * offset;
                browser.Height = browser.GetPreferredSize(new Size(2 * offset, 0)).Height; //this does NOT work with Webbrowsers...solution needed

                Point loc;
                if (Messages[i].Type == MessageType.Received)
                {
                    loc = new Point(Pad, CurrentY + Pad);
                    if (ReplyToId == "")
                        ReplyToId = Messages[i].ExternalID;
                }
                else
                {
                    loc = new Point(Pad + offset, CurrentY + Pad);
                }

                title.Location = loc;
                loc.Y += title.Height;
                browser.Location = loc;
                panel1.Controls.Add(browser);
                panel1.Controls.Add(title);
                CurrentY = browser.Location.Y + browser.Height;
            }
            panel1.AutoScrollPosition = new Point(Math.Abs(panel1.AutoScrollPosition.X), Math.Abs(CurrentPoint.Y)); 
            panel1.ResumeLayout();
        }

Is that what you need? Ive checked in code and the locations are being set correctly...just not displaying correctly : /

Ryshad

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Sep 25th, 2009

Re: Controls added to panel are moving down when repainted

I see. You need to set the scroll position to zero after clearing the controls, add your controls, then scroll it back where it was.

C# Syntax (Toggle Plain Text)
    private void button1_Click(object sender, EventArgs e)
    {
      int top = 0;
      Point pos = panel1.AutoScrollPosition; //retain the scrolled point
 
      panel1.SuspendLayout();
      panel1.Controls.Clear();
      panel1.AutoScrollPosition = Point.Empty; //clear the scrolled point
      for (int i1 = 0; i1 < 10; i1++)
      {
        TextBox txt = new TextBox();
        txt.Width = this.Width;
        txt.Top = top;
        txt.Text = "btn" + (i1 + 1).ToString();
        panel1.Controls.Add(txt);
        top += txt.Height;
      }
      panel1.ResumeLayout();
      panel1.AutoScrollPosition = new Point(Math.Abs(pos.X), Math.Abs(pos.Y)); //restore it
    }
    private void button1_Click(object sender, EventArgs e)
    {
      int top = 0;
      Point pos = panel1.AutoScrollPosition; //retain the scrolled point

      panel1.SuspendLayout();
      panel1.Controls.Clear();
      panel1.AutoScrollPosition = Point.Empty; //clear the scrolled point
      for (int i1 = 0; i1 < 10; i1++)
      {
        TextBox txt = new TextBox();
        txt.Width = this.Width;
        txt.Top = top;
        txt.Text = "btn" + (i1 + 1).ToString();
        panel1.Controls.Add(txt);
        top += txt.Height;
      }
      panel1.ResumeLayout();
      panel1.AutoScrollPosition = new Point(Math.Abs(pos.X), Math.Abs(pos.Y)); //restore it
    }

Last edited by sknake; Sep 25th, 2009 at 1:24 pm.

sknake

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Sep 25th, 2009

Re: Controls added to panel are moving down when repainted

Click to Expand / Collapse Quote originally posted by sknake ...

Can you post your code? This probably depends on the implementation of scrollbars in the panel

We should create a generic c# thread class in daniweb. that class will be inherited by all the threads and will add some common things that we keep repeating. for example, post your code, attach your application, mark as solved and such.
that will add these texts like a header to the thread, so as soon as the guy posted it, he will see all these and take the required action. How is that?

serkan sendur

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Sep 25th, 2009

Re: Controls added to panel are moving down when repainted

mark this thread as solved

serkan sendur

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Sep 28th, 2009

Re: Controls added to panel are moving down when repainted

setting the scrol to zero solved it, cheers sknake

Sorry for late reply/solved, had no time at all over the weekend to look at this.

Like the idea serkan, im new to the board, i've always managed to resolve issues or just ignored them so im still gettin used to the requirements for posting problems :p A reminder when posting would be helpful haha

Ryshad

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