[Pnet-developers] [bugs #10394] Control.cs Add(..) does not show the control if the control initially was removed

[Heiko Weiss]

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 of the project: DotGNU Portable.NET.




/**************************************************************************/
[bugs #10394] Full Item Snapshot:

URL: <http://savannah.gnu.org/bugs/?func=detailitem&item_id=10394>
Project: DotGNU Portable.NET
Submitted by: Heiko Weiss
On: Mit 15.09.2004 at 10:54

Category:  None
Severity:  5 - Average
Item Group:  None
Resolution:  None
Privacy:  Public
Assigned to:  None
Status:  Open


Summary:  Control.cs Add(..) does not show the control if the control initially 
was removed

Original Submission:  - create a form FF 
- in this form you have a Control XX 
- remove the control XX from the forms FF Controls collection in the 
contructure of the form FF
- some time after (e.g. Button Click) add the Control XX to the forms FF 
Controls collection by this.Controls.Add( XX )

-> the Control XX is not created correctly and is not been displayed

I have made a quick hack in Control.cs:
...
  // Add a control to this collection.
  public virtual void Add(Control value)
    {
     if(value != null)
     { 
      if(value.Parent == owner)
      {
       // We are already under this owner, so merely
       // send it to the back of its sibling stack.
       value.SendToBack();
      }
      else
      {
       // Suspend layout on the parent while we do this.
       owner.SuspendLayout();
       try
       {
        // Change the parent to the new owner.
        value.Parent = owner;

        // Assign the next tab order if the control doesnt have one.
        if (value.tabIndex == -1)
        {
         int lastIndex = 0;
         for (int i = 0; i < owner.numChildren; i++)
         {
          int index = owner.children[i].TabIndex;
          if (lastIndex <= index)
           lastIndex = index + 1;
         }
         value.tabIndex = lastIndex;
        }

        // Initialize layout within the new context.
        value.InitLayout();
       }
       finally
       {
        // Resume layout, but don't perform it yet.
        owner.ResumeLayout(false);
       }

       // Now perform layout on the control if necessary.
       if ( true /* Heiko Weiss: always create control owner.IsHandleCreated && 
value.Visible */ )
       {
        // Make sure the control exists.
        value.CreateControl();
        owner.PerformLayout(value, "Parent");
       }
       // Notify the owner that the control was added.
       owner.OnControlAdded
        (new ControlEventArgs(value));
      }
     }
    }
...













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