GridGroupingControl BackColor Transparency Problem

[Administrator]

I''ve been trying to get the GridGroupingControl in v4.2 to work correctly with colors.

For what ever reason, the GGC does not take the parents back color when it is added to a ControlCollection. Instead it defaults to SystemColors.Window This means that no matter what I do, I can''t get the GGC to take on the parent''s backColor.

The only way to make it work properly is to override OnParentChanged, and set the BackColor in there.

This has the interesting side effect of making OnBackColorChanged called twice, once from setting the backcolor in OnParentChanged once from the private method AssignParent(defined in Control). In the included example, you can this when commenting and uncommenting the line "BackColor = Parent.BackColor" in MyGGC.cs

Grid14.zip

[Administrator]

Hi Matthew,

Please refer this forum thread
http://www.syncfusion.com/support/Forums/message.aspx?&MessageID=50153

Let us know if this helps.
Thanks,
Rajagopal

[Administrator]

It doesn''t work. The back color never gets changed from Color.Window to the BackColor of the containing control.

This isn''t so much about transparency as it is about the GGC taking on the color of the parent control like it should normally.

>Hi Matthew,

Please refer this forum thread
http://www.syncfusion.com/support/Forums/message.aspx?&MessageID=50153

Let'>http://www.syncfusion.com/support/Forums/message.aspx?&MessageID=50153''>http://www.syncfusion.com/support/Forums/message.aspx?&MessageID=50153

Let us know if this helps.
Thanks,
Rajagopal

[Administrator]

Hi Matthew,

There is no built-in support for this. But you can derive the GridGroupingControl and override the OnParentBackColorChanged method to enable this. Below is a code snippet

public class MyGGC : GridGroupingControl
{
public MyGGC()
{}
protected override void OnParentBackColorChanged(EventArgs e)
{ base.OnParentBackColorChanged (e);
BackColor = Parent.BackColor; }
}

Let me know if this works.

Best Regards,
Haneef

[Administrator]

This works, but is a rather ugly hack considering that when deriving from a control you get this behavior for free. Why was behavior overridden?

[Administrator]

Hi Matthew,

I have consulted the development team regarding this issue and will let you know the details on this soon.

Thanks for your patience.

Best Regards,
Haneef

[Administrator]

Hi Matthew,

To make the GridGroupingControl reset its backcolor (and hence inherit the backcolor of its parent) by calling,
this.gridGroupingControl1.ResetBackColor();

So, you can make it inherit the color without deriving anything. (Note, the ResetBackColor method is inherited from Control and does not show up in intellisense, but it is valid.)

The reason the gridgroupingcontrol forces the backcolor is to prevent the default grid from showing cells with SystemColors.Control as their backcolors, since this would not be the desired color as default by the users.

Thanks,
Rajagopal