Scrollbar Refresh Issue in MDI Parent Form

Saumil Patel

I have a Parent Form with Graph Window as a child Window. In the parent form , there are buttons on the left side in panel. In the remaining area of the parent form , the child window will be shown. I am positioning the child windows manually in a following manner.

1st window

2nd window

3rd window , in vertical manner. So, this also creates a scroll bar on the right side of the parent form.

Once you click the graph button , the child window is created and positioned in the bottom of all other child windows. Since, a new window was added , scroll bar size needs to be refreshed as well. the vertical height of the bar only changes when I hover the cursor on the scroll bar. So, I click on the button on the left side, then to update the scroll bar I need to move the cursor on the scroll bar which is in the right side.

I tried to access the scroll bar but since it was automatically generated, i can not find a way to refresh it or give a focus manually.

Issue shown below:

this is how it should be

I have uploaded a video to show the behavior and also a demo project. Demo project : http://www.filedropper.com/demoforscrollbar Screen share video : http://tinypic.com/r/ic0615/5
Is there anyway I can update the scroll bar without user cursor movement or user clicking on it?
I tried to change MdiParentForm.VerticalScroll.Minimum and maximum after opening or closing the child window, but it did not help. I also tried to disable and enable vertical scroll along with MdiParentForm.AdjustFormScrollbars , but did not work.
I have autoscroll = false, since I can not make it true in mdicontainer form. After i create the child window, I have written below in parent form.

this.VerticalScroll.Minimum = 0;
this.VerticalScroll.Maximum = this.MdiChildren[this.MdiChildren.Length -1].Location.Y + this.MdiChildren[this.MdiChildren.Length - 1].Height;
this.AdjustFormScrollbars(true);
this.PerformLayout();

2 Replies

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Frogleg12y ago
Accepted answer
Try this

      private void CreateGraph()
        {
            for (int I = Imp.numberofchildwindowsopen + 1; I < Imp.numberofchildwindowsopen + 2; I++)
            {
                CreateMDIChild();
                this.MdiChildren[I - 1].StartPosition = FormStartPosition.Manual;
                this.ResumeLayout(false);
                if (I == 1)
                {
                    this.MdiChildren[I - 1].Location = new Point(0, 0);
                    this.MdiChildren[I - 1].Width = this.Width - panel1.Width - System.Windows.Forms.SystemInformation.VerticalScrollBarWidth;
                }
                else
                {
                    int x = this.MdiChildren[I - 2].Location.X;
                    int y = this.MdiChildren[I - 2].Location.Y + this.MdiChildren[I - 2].Height;
                    this.MdiChildren[I - 1].Location = new Point(x, y);
                    this.MdiChildren[I - 1].Width = this.Width - panel1.Width - 2 * System.Windows.Forms.SystemInformation.VerticalScrollBarWidth - 5;
                    this.MdiChildren[I - 2].Width = this.MdiChildren[I - 1].Width;
                    this.VerticalScroll.Minimum = 0;
                    this.VerticalScroll.Maximum = this.MdiChildren[this.MdiChildren.Length - 1].Location.Y + this.MdiChildren[this.MdiChildren.Length - 1].Height;
                    this.AdjustFormScrollbars(true);
                }
                this.MdiChildren[I - 1].Show();
                this.MdiChildren[I - 1].WindowState = FormWindowState.Normal;
            }
            this.PerformLayout();
            Imp.numberofchildwindowsopen++;
            this.Refresh();//added
        }
Saumil Patel12y ago
Thank you so much :)
silly thing I missed !