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Add documentation to the seekbar preview

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This commit is contained in:
Bnyro 2022-12-17 11:40:30 +01:00
parent a0ad5a1837
commit 2cb5ee51f5
1 changed files with 33 additions and 12 deletions
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45
app/src/main/java/com/github/libretube/util/SeekbarPreviewListener.kt
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@ -24,23 +24,16 @@ class SeekbarPreviewListener(
*/
override fun onScrubMove(timeBar: TimeBar, position: Long) {
moving = true
val preview = getPreviewFrame(position) ?: return
val previewFrame = getPreviewFrame(position) ?: return
// update the offset of the preview image view
updatePreviewX(position)
val request = ImageRequest.Builder(previewIv.context)
.data(preview.previewUrl)
.data(previewFrame.previewUrl)
.target {
if (!moving) return@target
val bitmap = it.toBitmap()
val heightPerFrame = bitmap.height / preview.framesPerPageY
val widthPerFrame = bitmap.width / preview.framesPerPageX
val frame = Bitmap.createBitmap(
bitmap,
preview.positionX * widthPerFrame,
preview.positionY * heightPerFrame,
widthPerFrame,
heightPerFrame
)
val frame = cutOutBitmap(it.toBitmap(), previewFrame)
previewIv.setImageBitmap(frame)
previewIv.visibility = View.VISIBLE
}
@ -54,6 +47,7 @@ class SeekbarPreviewListener(
*/
override fun onScrubStop(timeBar: TimeBar, position: Long, canceled: Boolean) {
moving = false
// animate the disappearance of the preview image
previewIv.animate()
.alpha(0f)
.translationYBy(30f)
@ -71,8 +65,10 @@ class SeekbarPreviewListener(
*/
private fun getPreviewFrame(position: Long): PreviewFrame? {
var startPosition: Long = 0
// get the frames with the best quality
val frames = previewFrames.sortedBy { it.frameHeight }.lastOrNull()
frames?.urls?.forEach { url ->
// iterate over all available positions and find the one matching the current position
for (y in 0 until frames.framesPerPageY!!) {
for (x in 0 until frames.framesPerPageX!!) {
val endPosition = startPosition + frames.durationPerFrame!!.toLong()
@ -86,6 +82,24 @@ class SeekbarPreviewListener(
return null
}
/**
* Cut off a new bitmap from the image that contains multiple preview thumbnails
*/
private fun cutOutBitmap(bitmap: Bitmap, previewFrame: PreviewFrame): Bitmap {
val heightPerFrame = bitmap.height / previewFrame.framesPerPageY
val widthPerFrame = bitmap.width / previewFrame.framesPerPageX
return Bitmap.createBitmap(
bitmap,
previewFrame.positionX * widthPerFrame,
previewFrame.positionY * heightPerFrame,
widthPerFrame,
heightPerFrame
)
}
/**
* Update the offset of the preview image to fit the current scrubber position
*/
private fun updatePreviewX(position: Long) {
val params = previewIv.layoutParams as MarginLayoutParams
val parentWidth = (previewIv.parent as View).width
@ -100,11 +114,18 @@ class SeekbarPreviewListener(
previewIv.layoutParams = params
}
/**
* Normalize the offset to not overflow the screen
*/
@Suppress("SameParameterValue")
private fun normalizeOffset(offset: Int, min: Int, max: Int): Int {
return maxOf(min, minOf(max, offset))
}
companion object {
/**
* The minimum start and end padding for the seekbar preview
*/
const val MIN_PADDING = 20
}
}