How to get the first and last note startTick?

[renanboni]

hey! hope you're doing great :)

I'm building an app that uses alphatab as a WebView but the problem is that I can't select the playback range (when I tap and hold to select the range the web view selects the text instead and it doesn't seem to pass down the event to alphatab) and a workaround would be to create a range where the user could slide to select a range and I would manually call the alphatab api.

I did most of the logic but I'm struggling to get the startTick of the first and last notes so I can build up my range.

Here's what I have so far:

function getRange(score, trackIndex) {
    // Ensure the track index is within range
    if (score.tracks.length <= trackIndex) {
        throw new Error('Invalid track index');
    }

    let displayStartList = [];

    // Traverse the object hierarchy
    let track = score.tracks[trackIndex];
    for (let staff of track.staves) {
        for (let bar of staff.bars) {
            for (let voice of bar.voices) {
                for (let beat of voice.beats) {
                    // Add the displayStart property to the list
                    displayStartList.push(beat.displayStart);
                }
            }
        }
    }

    return displayStartList;
}

// then I would call

function setPlaybackRangePosition(start, end) {
    this.api.playbackRange = { startTick: start, endTick: end };
}

but it doesn't seem to be accurate as some of the last notes are left behind, I've also tried with absoluteDisplayStart and absolutePlaybackStart and I got similar result.

is there a way to do what I've been trying?

thank you

[Danielku15]

I think there are two ways to tackle this topic:

1. Ensure/Implement proper touch input support. You could check out how the normal interaction with mouse events is realized here and implement a touch compatible counterpart for your needs. The API should be public enough to implement a custom touch variant fitting your needs (tap, tap-hold etc.).
2. Use some workaround like you propose and use the MidiTickLookup to lookup the correct range like described here: How to specify the loop playback of sections in Alphtab #1126