When LegendBox hides / shows, X-Axis looses Scroll Position

[User (Legacy)]

Hi,

When a user clicks the Hide / Show Legend button on my Chart FX chart, the 

X-Axis scroll bar scrolls to the left, so the user looses the data that they 

were looking at.

The same thing used to happen whenever the chart size changed due to window 

resizing, but I fixed this by capturing the "Client Size Changed" event of 

the Split Container's Panel that my chart resides on, and setting the Scroll 

Bar position to what it used to be.

I am trying to figure out how to capture a LegendBox Visible Changed event 

or other event that will allow me to set the Chart's Scroll position to what 

it was before the LegendBox was shown / hidden.

I tried capturing the LegendBox's Visible Changed event like this:

Chart.LegendBox.VisibleChanged += new 

EventHandler(LegendBox_VisibleChanged);

but when the user clicks the Legend Show / Hide button the event handler is 

never called.

How can I stop the X-Axis Scroll Bar Position from changing whenever the 

user shows or hides the LegendBox?  Is there an event I can handle?  Or 

maybe a property of the chart I can set?  By the way, my chart is constantly 

getting ticks drawn on it in real time, so I need a solution that is 

different than catching every paint or invalidate event of my chart.

Thanks,

Brook Hunter

[Software FX]

I can not reproduce this behavior. I can show/hide the legend box and the 

scroll position is kept. Are you setting AxisX.AutoScroll = true ?

The only case in which the Scrollbar is affected by turning the legend box 

on/off is when the scrollbar is near the end. If I remove the legend box, I 

now have less scroll so the scroll position is adjusted (still at the end 

but with a value lesser than before), if I turn the legend box back on, then 

the scrollbar will not be at the end anymore. This behavior is common in 

scrolling containers, like for instance Visual Studio.

As for knowing when the legend box is show/hidden you can capture the 

InternalCommand event.

-- 

Francisco Padron

www.chartfx.com