Question

I have a panel where I dynamically add custom controls to it. If controls go out of the panels bounds, Horizontal/Vertical scrollbars automatically shows (AutoScroll == true) and scrollbars will follow the control via the following code:

if(panelDiagram.VerticalScroll.Visible || panelDiagram.HorizontalScroll.Visible) {
    panelDiagram.ScrollControlIntoView(tempNode);
}

This way, while moving the tempNode around, scrollbars will follow it.

Is there any way to preserve the state of the scrollbars when I load everything again from the database? I tried a lot of things like ScrollControlIntoView(lastAddedControl) but nothing is working. Maybe I have to turn off AutoScroll and manage everything by my hand?

Answer 1

Panel is derived from ScrollableControl which exposes a few properties you might find useful:

• AutoScrollPosition
• VerticalScroll
• HorizontalScroll

It looks like autoScrollPosition is what you’re after; it’s a Point instance that contains the current X and Y scroll coordinates for each scrollbar. X will be zero if you’re only doing vertical scrolling.

Save it like so:

public override void OnLoad(Object sender, EventArgs e) {

    this.panel1.AutoScrollPosition = GetSavedScrollPoint();

}

public override void OnFormClosing(Object sender, EventArgs e) {

    SavePointSomewhere( this.panel1.AutoScrollPosition );
}