Hello,

   We use in our application besides the DiagramView controls, some third party controls which uses different scroll bars then the classical VScrollBar which is used by the DiagramView. These controls can be set to use the just the silver xp theme look for their scrollbars so we want the DiagramView also to use just the silver xp look for its scrollbars, no matter what color scheme is set on the target machine.

Is there a possibility to skin the DiagramView scrollbars? The only way I found is to replace them entirely. Is there another simpler way to have a custom look for the DiagramView scrollbars?

Thanks,
Bogdan

Thanks,

So the only solution is to place my third party scroll bars on to the diagram view and hide the original ones.
I encounter 2 issues here:

1. If I hide the original scroll bars (ShowScrollBars = false) than the border gap disappears.

I have a refresh layout method which is called each time a table node is added into the diagram:

public void RefreshDiagramLayout()
{
_ermDiagram.RouteAllLinks();

_layout.Arrange(_ermDiagram);//, _ermDiagram.Items);

//the Diagram.ResizeToFitItems method must be called after the Layout.Arrange was called,
//otherwise, chances exist that the items (tables) to not be correctly fit in the view
_ermDiagram.ResizeToFitItems(25, false);
}

But if ShowScrollBars = false then the 25 mm border gap disappears.

2. I need a way to update the scrollbars settings every time the diagram is updated. I don't know if this covers all the cases but I 've overwritten the DiagramView's OnLayout method, and after calling the base class's OnLayout, I copy the original scrollbars properties into the new ones (Visible, Value, Minimum, Maximum, SmallChange, LargeChange). Is this a correct approach ?

Thanks,
Bogdan[pre][/pre]

Hi Stoyo,

1. I placed the new scollbars on the right and bottom of the diagram view, so the diagram view and the scrollbars are placed on a container panel, the scrollbars docked to the right and bottom and the diagram view filled in that container panel.
But it seams that if I set ShowScrollBars = false (no matter if new scrollbars are placed on the container panel or not), the border gap disappears.

The only way to overcome this unwanted behavior is to place the diagram view in its own container panel and set the Padding property to this panel. Is there another way to show that border gap and also to have "ShowScrollBars = false" ?

2. Thanks, that seems to handle all situations when the scrollbars are redimensioned. But I have a problem. I used this code which is called from the ScrollChanged, BoundsChanged and ZoomChanged event handlers:

internal void SetCustomScrollBars()
        {
            //diagramView.VScrollBar.Visible = true;
            //diagramView.HScrollBar.Visible = true;

            if (diagramView.HScrollBar == null || !diagramView.HScrollBar.Visible)
            {
                horizontalScrollbar.Visible = false;
            }
            else
            {
                horizontalScrollbar.Visible = true;
                horizontalScrollbar.Minimum = diagramView.HScrollBar.Minimum;
                horizontalScrollbar.Maximum = diagramView.HScrollBar.Maximum;
                horizontalScrollbar.SmallChange = diagramView.HScrollBar.SmallChange;
                horizontalScrollbar.LargeChange = diagramView.HScrollBar.LargeChange;
                horizontalScrollbar.Value = diagramView.HScrollBar.Value;
            }

            if (diagramView.VScrollBar == null || !diagramView.VScrollBar.Visible)
            {
                verticalScrollbar.Visible = false;
            }
            else
            {
                verticalScrollbar.Visible = true;
                verticalScrollbar.Minimum = diagramView.VScrollBar.Minimum;
                verticalScrollbar.Maximum = diagramView.VScrollBar.Maximum;
                verticalScrollbar.SmallChange = diagramView.VScrollBar.SmallChange;
                verticalScrollbar.LargeChange = diagramView.VScrollBar.LargeChange;
                verticalScrollbar.Value = diagramView.VScrollBar.Value;
            }

            //diagramView.VScrollBar.Visible = false;
            //diagramView.HScrollBar.Visible = false;
        }
 

...and it's working very well but only when the ShowScrollBars=true. And in this case both scrollbars pairs are displayed, so I need to hide the original one. My problem is that if I set the ShowScrollBars=false the diagramView.HScrollBar and diagramView.VScrollBar are null so I can't use them anymore to copy their settings into the new ones.
I tried (the first and last 2 lines commented) to hide the original scrollbars on runtime (ShowScrollBars=true) but it does not work. They still appear.

Can you give me a hint on how to simulate the original scrollbars min/max/small/large properties updates into the new scrollbars?

Thanks,
Bogdan

Great, it seems it did the trick. Only one small issue here: I replaced the

 SetScrollX(diagram.Bounds.Left);  

with

 ScrollX = diagram.Bounds.Left;  

because the SetScrollX is a private method. Are there any drawbacks in using ScollX assignment instead of calling the SetScrollX private method?

Ah, and I've added also a Layout event handler for the diagram view where I call the ResetScrollbars method. Because when resizing the diagram view, the scollbars did not get updated. (so, the ResetScollbars is now called from DiagramView_ScrollChanged, DiagramView_ZoomFactorChanged, DiagramView_Layout and Diagram_BoundsChanged event handlers ).

Thanks,
Bogdan

Thanks a lot!