I have a control in C# that I want to AutoScroll. But when the scroll bar appears, it overlays part of the control. Is there any way I can make the control resize its contents to accomodate the scroll bar? This isn't a custom control; it's a standard .NET TabPage control. I really don't want to have to wire up a scroll bar manually...
I was able to work around this by adding a Panel control to the control I wanted to scroll, with a 12px right margin to accommodate the scrollbar. Not sure how this will look on high DPI settings, but it can always be tweaked.
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So I am making a dark mode option for my application and I want the scrollbar back color to also change color so that it doesn't look out of place. I have tried to search for a solution but so far I have only found code for a scrollbar as in the control. but I need to change the scrollbar of a panel. Does someone happen to know how to do this? Thanks a lot in advance.
I faced the same challenge when I started to work on custom controls that should support the Dark Mode. The problem with Panel control as well as other controls is that their ScrollBars are managed internally by those controls and there is no way to customize them.
My Idea was to create a custom ScrollBar control that supports custom colors and themes, see my answer https://stackoverflow.com/a/73613059/5514131
And in our custom Panel control, we create the custom ScrollBars internally and use the various Panel properties and events to link the custom ScrollBars to our Panel.
With the help of the Panel VerticalScroll and HorizontalScroll properties, we can know whether the default Panel scrollbars are visible or not and their properties to copy to our custom ScrollBars.
With the help of LocationChanged, SizeChanged, and other Panel events and properties we should bind the custom ScrollBars to our Panel and place them on top of the default ones to completely cover them.
I used the OnMouseWheel and OnScroll to update our custom ScrollBars when the Panel is scrolled using the code or mouse wheel.
We should dispose the custom ScrollBars when the Panel is disposed, or its handle is destroyed.
I know this isn't the best approach, but it should work to prevent the default ugly scrollbars from ruining your beautiful Dark Mode.
This workaround can be applied to other controls, I actually used it with TabControls, however, it will be more complex to implement.
Windows Forms Panel control with custom ScrollBars based on the Flat ScrollBar control https://gist.github.com/ahmedosama007/39f8b76e65300e5969110b753fe0a654
Using WinForms, C#...
I have a UserControl that contains a few panels.
When I programatically resize the panel, it causes the scroll bar to scroll to the top. I would like to prevent this as it is frustrating for the user to have the control scroll to the top.
I've tried to use "ScrollToControl()" after the resize bu this isnt practical as you still see the form jump and the once focused control is now at the bottom of the control.
Have tried to access the AutoScrollPosition but it returns 0. this.VerticalScroll.Value also returns 0 (where this is the user control before the resize event)
Any suggestions?
I'm making an instant messaging application in C#. The problem that I'm facing right now is that for the contacts list I've made a custom control extendinguserControl, which contains aFlowLayoutPanel`.
That panel will contain a list of userControls. I want to customize the VscrollBar, but no chance (not possible). Instead I have this genius idea to hide the VscrollBar from the FlowLayoutPanel, and make simple buttons (UP and down events). For this everything worked like a charm, but when I tried to hide the VscrollBar by making the property autoScroll = false , the buttons stopped working.
How can I hide the VscrollBar?
If you want to hide the the vertical bar, there are some possible solutions. ..
You could make an event for resize, controls add, controls remove and set all the child controls' width to flowlayoutpanel.width -20
You could add a panel to the flowlayoutpanel and set it to autosize and make the panels may width to flowlayoutpanel.width-20.
You could check if the width of the flowlayoutpanel is bigger than its real width (means vscrollbar appeared) , and resize the children that it'll/ld hide again
and if you are sure that your controls are smaller than the flowlayoutpanel's width, you simply could create a panel which covers the vertical bar. (use .BringToFront() to put it before the flowlayoutpanel's scrollbar)
I hope that I understood and perhaps have solved the problem
I'm writing a custom control that contains a list of items (child controls) that resize horizontally to fit the width of the control. If there are lots of items (or the control is resized so that it is not tall enough vertically) then a vertical scroll bar is necessary; but when the vertical scroll bar appears, the child controls are suddenly too wide, which causes a horizontal scroll bar to appear.
What's the proper way to guarantee that a horizontal scroll bar does not appear when it is not necessary, given that I am controlling the control placement manually (not relying on AnchorStyles)? (Note: I can't control the VScroll property manually because I'm on Compact Framework; and if an item's minimum width is wider than the client area then a horizontal scroll bar will be required legitimately.)
What I did in a similar situation was after every time I added an item to the list I detected whether the scroll bar was visible or not and adjusted my the width manually.
What I did to detect whether the scroll bar was showing was either:
Test for the WS_VSCROLL was set on the control via P/Invoke via GetWindowLong().
Scan the control's children for a vertical scroll bar control.
It depends on how the control handles scroll bars as to which one is correct.
Also this was on Windows, not in the CF so I'm not sure if this will work exactly the same way.
Take the width of the vertical scrollbar into account when calculating the required width for your child controls:
System.Windows.Forms.SystemInformation.VerticalScrollBarWidth
A disclaimer first! This might be a very fundamental question, but I have started learning Winforms Application Development on my own (.net 3.5,C#), and I have this resizing question.
I am developing a small Winforms application that has a standard tab control (along with many other controls) placed in the form. (It has 5 TabPages)
The AutoScroll property for the TabPage has been set to “True”. On reading up what I got to understand is that this will enable the scrollbars to show up at run time while resizing. i.e if the height of the form is reduced it will cause the vertical scrollbar to show up within the TabPage.
While the application is running, what I noticed is that if I reduce the height of the form using the little double headed arrow, the scroll bar does not stay on top, i.e if I adjust the height from below, the bottom end of the scrollbar is no longer there. More precisely I am just looking for a way to keep both ends of the scrollbar on top within a TabPage when the form containing the Tab control is resized.
It sounds like the problem is that the tabbed control will show scrollbars and may well autosize, but you haven't told the form what to do.
You might want to look at the 'Dock' property of controls, which causes a control to fill a specific area of the form (or other parent control), no matter what it is resized to.