Carousel

Use lcsCarousel for a welcome tour on first run, announcements at the top of a home screen, or a few featured items. Canvas apps have no carousel; the usual build is a gallery turned sideways with no timer, no dots and nothing for a screen reader. This component is the real thing, with the parts that make an auto-advancing banner acceptable:

• Slides from a table of Key, Title, Text, Image (a picture URL) and Color (a fill behind the text when there's no picture);
• A timer that advances the slides (AutoPlay, Interval), a pause control so people can stop it, and arrows or dots that stop it when a person takes over;
• Dots that are buttons to each slide ("Slide 2: Book a room, current") and arrows that disable at the ends when Loop is off;
• OnChange(Key, Index) when the slide changes and OnSelect(Key, Index) when the slide itself is tapped; Next, Previous, GoTo, Play and Pause from your app;
• Each slide fades in, and the caption sits over a gradient so white text reads on any picture.

The examples call it crsHome at the top of the home screen.

Announcements from a Dataverse table, the newest three:

// crsHome.Items
ShowColumns(
    RenameColumns(FirstN(Sort(Filter(Announcements, Active), 'Created On', SortOrder.Descending), 3), "Announcement", "Key", "Headline", "Title", "Summary", "Text", "Picture URL", "Image", "Fill", "Color"),
    "Key", "Title", "Text", "Image", "Color"
)

Open the announcement when the slide is tapped:

// crsHome.OnSelect
Navigate(scrAnnouncement, ScreenTransition.None, {ID: GUID(Key)})

A first-run tour that stops at the end, with a Done button that appears on the last slide:

// crsTour.AutoPlay, crsTour.Loop
false
false

// btnDone.Visible
crsTour.CurrentIndex = crsTour.Count

Pause while a dialog is open:

// dlgConfirm.OnOpen (or wherever you show it)
crsHome.Pause()

• Columns. Items wants exactly Key, Title, Text, Image and Color; RenameColumns and ShowColumns get them from any table, as in Use it. An image column needs a URL the app can load; for a Dataverse image column, use its full-size URL from the record, or store pictures in Blob Storage with a SAS and pass the link.
• Keep it short. Three to five slides is a banner; past that, it's a list, and people won't wait for the timer.
• Pictures. 16 by 9 looks right at the default 480 by 270; the picture is shown with Fill, so the edges of a different shape are cropped, not stretched.

• The slide is one button named "Slide 2 of 3: Book a room in two taps. Pick a room, pick a time…", so a screen reader hears the slide's words; the dots are buttons named by slide and "current"; the arrows and the pause control are named. Tab reaches them all; Enter and Space act.
• Auto-advancing content needs a way to stop it: the pause control is on by default when AutoPlay is, and using an arrow or a dot stops the timer too. Keep Interval at five seconds or more so there's time to read.
• The caption sits over a dark gradient, so white text keeps its contrast on a light picture.
• With Motion on, a slide fades in over under half a second; none plays for people who've asked their device for reduced motion, and the slides still change on the timer. For people who've asked for less motion, consider AutoPlay off.

• In Power Apps Studio, timers run only in preview (F5); in the published app, the timer always runs. Test the auto-advance with the app playing.
• The timer resets when it ends, not when a person moves a slide, so after an arrow or a dot the next automatic advance can come sooner than Interval. Arrows and dots pause the timer; Play() starts it again.
• A picture is loaded from its URL each time its slide shows; keep pictures small, or use a colour.
• One slide shows at a time; there's no peek at the next one and no swipe.

• 0.1.0: first version: slides from a table, the timer with pause, dots and arrows, Loop, captions over a gradient, OnChange, OnSelect, Next, Previous, GoTo, Play, Pause, the outputs, light and dark, the fade motion.