Magic TabControl - VS.NET Style

• Download Magic_Library_1.7.4.2_3_-noexe.zip - 1.2 MB

Introduction

Update to the Magic TabControl to add the ability to allow:

• Change the Tab Title Font
• Change Enable property of a Tab page
• Change Visible property of a Tab page

Background

This is an update to the Magic TabControl

Using the code

In this release of the Magic TabControl, the ability to make Visible a given page as well as Enable a given page is now implemented.   The programmer can set the status programmatically as shown in the code sample below.

 private void chkVisible_CheckedChanged(object sender, EventArgs e)
        {
            if (cboTabsInControl.SelectedIndex > -1)
            {
                ((Crownwood.Magic.Controls.TabPage)cboTabsInControl.SelectedItem).Visible = chkVisible.Checked;
            }
        }

private void chkEnabled_CheckedChanged(object sender, EventArgs e)
        {
            if (cboTabsInControl.SelectedIndex >-1)
            {
                ((Crownwood.Magic.Controls.TabPage)cboTabsInControl.SelectedItem).Enabled = chkEnabled.Checked;
            }
        }

Points of Interest

The ability to add this simple mods was straight forward. For the Visibile property, the following enhancement to TabControls.cs was made:

  protected virtual void AddTabPage(TabPage page)
        {
            // Has not been shown for the first time yet
            page.Shown = false;
            page.VisibleChanged += new EventHandler(OnPageVisibleChanged);

...

/// <summary>
/// mod: <c>OnPageVisiblieChanged</c>
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected virtual void OnPageVisibleChanged(object sender,EventArgs e)
{
  if (sender is TabPage)
    {
     if (!((TabPage)sender).Visible)
       {

         ((TabPage)sender).TabIndex = _tabPages.IndexOf((TabPage)sender); // Remember where it was...
         _tabPages.Remove((TabPage)sender);
         _tabPagesInVisible.Add((TabPage)sender);
        }
       else
        {
         if (_tabPagesInVisible.Count != 0)
           {
             foreach(TabPage page in _tabPagesInVisible)
               {
                if (page.Title == ((TabPage)sender).Title)
                  {
                    //_tabPages.Add((TabPage)sender);     // ToDo: Need to get the page back to its original position.
                    _tabPages.Insert(((TabPage)sender).TabIndex, (TabPage)sender);
                    _tabPagesInVisible.Remove(page);
                    break;
                   }
                }
             }
          }
     }
}

 public virtual TabPageCollection TabPages
        {
            get {
                //Mod:  Combine the non visible with the visible
                TabPageCollection allPages = _tabPages;
                if (_tabPagesInVisible.Count != 0)
                {
                  foreach(TabPage page in _tabPagesInVisible)
                  {
                      allPages.Insert(page.TabIndex, page);             // Make sure to put the pages back where they were originally.
                  }
                }
                return allPages; // _tabPages;
            }
        }

  protected virtual void MovePageSelection(TabPage page)
        {
            int pageIndex = _tabPages.IndexOf(page);

            if (pageIndex != _pageSelected  && page.Enabled == true)

...

History

Update to the Magic TabControl to add the ability to allow:

• Change the Tab Title Font
• Change Enable property of a Tab page
• Change Visible property of a Tab page