return (SMOOTH_VALUE * firstPos) + heightOfScreen + 50 This number can be adjusted based on your use case and expected size of an item. If the scroll bar jumping to the end of the list is an issue, a very simple change would be to add a static value to the heightOfScreen. The only way we know the extant we’ve traversed is by scrolling each item off the screen. Since the top item isn’t the same size as the bottom item, the amount scrolled will not always match up with the extant we have already traversed. The reason this is needed is because we do not know the size of all the items and we are tracking the position from the top. class CoolLayoutManager extends LinearLayoutManager return (SMOOTH_VALUE * firstPos) + heightOfScreen Ībove this code block, we must check if we are at the last item – if so, scroll to the end. We want smoothScrolling off so we can can add that to our LayoutManager’s constructor. There are several stock layout managers, but we are interested in the LinearLayoutManager. The LayoutManager is responsible for positioning items as well as recycling items in a RecyclerView. To adjust how the scrollbar behaves for every increment of scroll for the solution we pursued, we have to use a custom LayoutManager. We chose the first approach - its performance will always be better and can support updates to the content without remeasuring everything.īefore we can go deeper, let’s discuss the nomenclature for the various parts that make up a scrollbar.Įven with items only varying in height a small amount, the scrollbar thumb can be jarring. To accomplish this for a list of items with varying height, you must either create a custom layoutManager that estimates how the scrollbar should move for each user interaction, or that measures the entire list to calculate the size of each item before displaying it. To keep things performant, we want a scrollbar that can accurately and smoothly track the user’s position in a list of content without knowing the entire list. The scrollbar will not move smoothly – it will jump around and resize. Unfortunately, a scrollbar that doesn’t behave erratically is not well supported out of the box when working with dynamically-sized items in a RecyclerView. It’s an important feature for a news publication to have, especially since articles have items varying in height, from one-line bylines to vertically-oriented images.Īs an Android developer on The Wall Street Journal, handling lists with content of varying heights is a common use case on Android. ![]() Alternatively the default mouse wheel speed could be adjusted to be more like Windows or macOS out of the box.Scrolling in Android: Custom Scroll Behavior for a List of Varying HeightĪ scrollbar is a useful and recognizable way to show progress and position in a feed of content. Having an option in Preferences of Brave would be an absolutely lifesaver for all Linux users. So a global GTK setting won't really suffice. Sublime Text, VS Code, Terminal) all scroll really well and much faster relative to Chromium. The extension sadly is not the answer here, it doesn't work well enough imhoĪnother point is that many other apps (e.g. Often when I move the scroll wheel slowly (one click), Chrome / Brave don't scroll at all while Firefox always does. Even when using the extension linked above, the scrolling is not anywhere near as responsive as Firefox. These make Firefox absolutely perfect on the scrolling front.Īs mentioned Brave (and all Chromium-based browsers) have very slow scrolling on Linux out of the box. User_pref ( "mousewheel.system_scroll_override_on_root_content.enabled", true ) user_pref ( "mousewheel.system_scroll_override_on_root_", 150 ) user_pref ( "mousewheel.system_scroll_override_on_root_", 150 ) My experience has been that high-res touchpad behavior is consistent across OSs and only wheel clicks differ. Does anyone know if this is accurate? If so, that would at least make me happy. My impression is that -scroll-pixels only affects wheel "clicks", not high-resolution-scrolling devices. Supporting or bringing back -scroll-pixels resolves this for everyone? Because I don't see us doing any UI work for this. I just generally hate the idea of injecting javascript into all webpages that takes over my scroll wheel. It's extra configuration and something to install when i set up a new machine, extra configuration that I don't have to do currently. ![]() With my settings it negatively affects touchpad use, so requires manual toggling If I'm switching peripherals on my laptop. However when i applied that patch lots of other software started scrolling uncomfortably quickly, (including brave accessed via remote desktop!) It's being tracked in several places, and if you follow all the finger-pointing the consensus seems to be that it's the windowing compositor's problem, so for X11 the solution is this xf86-libinput driver patch (or some revised version of it): Looks like fix for this is being tracked here:
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