Windows Explorer is able to display semi-visible items when scrolling. This behaviour produces a smooth scrolling.
Is there a way to reproduce this effect with the ListView in Windows Forms?
Update
I found by change another ListView with same behaviour:
Being able to scroll by a partial line is not generally a useful feature.
However, if you really want to be able to do it, just set ShowGroups to true. The ListView control will then allow pixel level scrolling.
For example:
Related
I want to slow the vertical scroll speed in my application. But can't find a way to do it. I found that VerticalScrollbar.SmallChange property can be used to control speed. But I can't find that property in the listBox property list. There is HorizontalScrollbar, which I can show or hide. But there is no VerticalScrollbar option. The vertical scrollbar is built-in in list box but apparently no way to control its properties. Any way out? Thanks in advance.
I am developing an application on the UWP primarily targeted to W10 mobile users, however I believe this issue will also be valid if attempted on a touchscreen W10 device.
I am using a ListView to lay out a set of buttons (ListViewItems, technically) which have text and an icon. They are in my SplitView and are used similar to how you see in the Windows default apps such as Groove Music and News, as pictured:
It works perfectly as I'd hoped, except that if the user pulls up or down on the ListView with their finger it will 'squash' the list up or down - a useful animation for lists of emails, for example, but something undesirable on the UI of my program.
Is there a way of disabling this behaviour? If not, is there an alternative control that could suit my needs, or should I use a custom control?
Set the ScrollViewer.VerticalScrollMode to Auto or Disabled on your ListView:
<ListView
x:Name="ListView"
ScrollViewer.VerticalScrollMode="Auto"
</ListView>
The default value is Enabled which will always "squash" the top and bottom. When set to Auto, then if there is no need to scroll (less elements than the viewport can fill), the "squash" effect will be disabled. And if you set the value to Disabled, then the scrolling will be disabled no matter how many elements need to be displayed.
For the official documentation see here.
I've been tasked at work with creating a UserControl containing a ListView and ComboBox's for sorting the ListView data. Sorting with the Combobox's s the easy part; the part with which I'm having difficulty is implementing a method of scrolling. In the end, the control should have an Excel-like feel to it. However, sometimes the ListView is too tall or wide for where it is placed. Therefore, there two be two scrollbars somewhere on the control. One vertically moves of the ListView only, and the other moves both the ListView and ComboBox filters horizontally.
Please note in the image above that the ComboBox's do adjust themselves according to column width, but the code for that is not enabled at the moment.
What I've tried: In the control, the filter boxes are in their own panel, and the ListView has had its own panel at times. I've tried using various combinations of the HScroll/VScroll and HorizontalScroll/VerticalScroll properties and the native function ShowScrollBar() for all the controls, but nothing has worked. The only way I've gotten scrollbars to appear is by settings AutoScroll (Scrollable for the ListView) to true. Of course, the scroll bars come in pairs and work only on the same control. I also attempted to programmatically move the scroll bars, but I haven't been able to accomplish that, either.
I've got to be doing something wrong, but I'm not sure what it is. Any help is appreciated!
I think I'd go for a different solution.
If you put the ComboBoxes in a AutoSrcoll panel with the same Anchors as the ListView you would give your users the freedom to scroll the two independently.
Yes, a ScrollBar would appear and take space but I would still happily sell that as a feature, not a bug ;-)
As for handling the Scroll event of a ListView: It is hidden and you'll have to subclass it to get access to it. See here
I need to create an app for TV guide. Requirement is that UI must be a copy of one you can see here: raspored.bnet.hr. As you can see, there's a lot of data. So, basically it would be a large scrollable table. Since there is no such UI control as table on Windows Phone, I found out that the best approach would be to create one vertical listbox with horizontal listboxes as its items. This is all ok and I'm able to create it. But, to make it behave like a table I also need to make these horizontal listboxes scroll in sync, not to scroll one row at a time. Then I disabled horizontal scroll on horizontal listboxes, and enabled it on the parent (vertical) listbox and while it gave the result I wanted to achieve one big problem came up - UI virtualization. I know ListBox has UI virtualization enabled by default and I can see it while scrolling on vertical listbox, but when I disable horizontal scroll on horizontal listboxes, performance is really bad, and sometimes there's an OutOfMemoryException. I understand why this happens because when I disabled horizontal scroll, those listboxes didn't know which items are on screen anymore, so the loaded all of them into memory.
What I also tried is to leave scroll on every listbox so they have UI virtualization, and then place ScrollViewer above them. Then I tried to listen on Manipulation events on scrollviewer and progamatically scroll all of the listboxes as needed. This didn't work good, first of all ManipulationDelta event doesn't appear to fire frequently enough to make scrolling smooth, and I think there could be a performance problem with calling ScrollToHorizontalOffset on ~180 listboxes.
I also tried the LongListSelector from WP8 as I read that it has much better UI virtualization and should be used instead of ListBox. The problem with this is that I couldn't make it scroll horizontally. Is it possible at all? I tried to wrap it into ScrollViewer which can scroll horizontally and it's working, but only if I set fixed width on LLS.
I also tried Telerik's RadDataBoundListBox and the problem was similar, I can't get both horizontal and vertical scrolls on the same listbox. So I could only get that each list scrolls on its own.
Can someone tell me if they had similar situation and what would be the best approach to solve this? I believe I'm not the only one that has this requirement to implement large scrollable table.
Thanks
UPDATE:
I'll just inform you that I didn't find a proper way to implement this, instead I've done it in HTML with WebBrowser control. Seems like IE already has UI virtualization implemented so it can work with large pages very well.
May be in your listbox there are images? and Out of memory Execption will occur you can do 2 things:
Don't load data in one time use BackgroundWorker
Have one local image in the App of the image you are downloading and set it as default image & when you scroll to some 50 values in forward clean the image Url to local and when it comes back give again the image url you want to show .
Because i have used it to scroll around 20k values.
I am developing an application that will use touch screens to navigate for use in a warehouse environment.
There is a need to present a list to the users and because this list could be quite long, the user will at some point need to scroll down the list.
As you all know the system scroll bars for panels and textboxes etc is quite small and I would like to know if I can either resize the controls that make up the scroll bar (the little arrows at the top and bottom, and the place holder bar in the scroll bar itself), or if I can create a couple of buttons that can scroll up and down my control for me?
Thanks,
Karl
Answer pulled from this post.
Check this out:
Winforms - Adjust width of vertical scrollbar on CheckedListBox
Worth mentioning too:
.NET Compact framework - make scrollbars wider
More of the same, but this time with a better solution through the use of the scrollbar control:
Change the width of a scrollbar
Another one in which the guy teaches how to create your own scrollbar control (interesting):
Set the Scrollbar width of a DataGridView
The last one (worth trying):
Is there a way to get the scrollbar height and width for a ListView control
You can add your own scroll buttons and programatically scroll like so:
myPanel.VerticalScroll.Value++;