mirror of
https://github.com/libre-tube/LibreTube.git
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Merge pull request #2417 from Bnyro/master
Add documentation to the seekbar preview
This commit is contained in:
commit
3b72211d48
@ -24,23 +24,16 @@ class SeekbarPreviewListener(
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*/
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override fun onScrubMove(timeBar: TimeBar, position: Long) {
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moving = true
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val preview = getPreviewFrame(position) ?: return
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val previewFrame = getPreviewFrame(position) ?: return
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// update the offset of the preview image view
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updatePreviewX(position)
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val request = ImageRequest.Builder(previewIv.context)
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.data(preview.previewUrl)
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.data(previewFrame.previewUrl)
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.target {
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if (!moving) return@target
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val bitmap = it.toBitmap()
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val heightPerFrame = bitmap.height / preview.framesPerPageY
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val widthPerFrame = bitmap.width / preview.framesPerPageX
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val frame = Bitmap.createBitmap(
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bitmap,
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preview.positionX * widthPerFrame,
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preview.positionY * heightPerFrame,
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widthPerFrame,
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heightPerFrame
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)
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val frame = cutOutBitmap(it.toBitmap(), previewFrame)
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previewIv.setImageBitmap(frame)
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previewIv.visibility = View.VISIBLE
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}
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@ -54,6 +47,7 @@ class SeekbarPreviewListener(
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*/
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override fun onScrubStop(timeBar: TimeBar, position: Long, canceled: Boolean) {
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moving = false
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// animate the disappearance of the preview image
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previewIv.animate()
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.alpha(0f)
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.translationYBy(30f)
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@ -71,8 +65,10 @@ class SeekbarPreviewListener(
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*/
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private fun getPreviewFrame(position: Long): PreviewFrame? {
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var startPosition: Long = 0
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// get the frames with the best quality
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val frames = previewFrames.sortedBy { it.frameHeight }.lastOrNull()
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frames?.urls?.forEach { url ->
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// iterate over all available positions and find the one matching the current position
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for (y in 0 until frames.framesPerPageY!!) {
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for (x in 0 until frames.framesPerPageX!!) {
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val endPosition = startPosition + frames.durationPerFrame!!.toLong()
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@ -86,6 +82,24 @@ class SeekbarPreviewListener(
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return null
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}
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/**
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* Cut off a new bitmap from the image that contains multiple preview thumbnails
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*/
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private fun cutOutBitmap(bitmap: Bitmap, previewFrame: PreviewFrame): Bitmap {
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val heightPerFrame = bitmap.height / previewFrame.framesPerPageY
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val widthPerFrame = bitmap.width / previewFrame.framesPerPageX
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return Bitmap.createBitmap(
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bitmap,
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previewFrame.positionX * widthPerFrame,
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previewFrame.positionY * heightPerFrame,
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widthPerFrame,
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heightPerFrame
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)
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}
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/**
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* Update the offset of the preview image to fit the current scrubber position
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*/
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private fun updatePreviewX(position: Long) {
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val params = previewIv.layoutParams as MarginLayoutParams
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val parentWidth = (previewIv.parent as View).width
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@ -100,11 +114,18 @@ class SeekbarPreviewListener(
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previewIv.layoutParams = params
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}
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/**
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* Normalize the offset to not overflow the screen
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*/
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@Suppress("SameParameterValue")
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private fun normalizeOffset(offset: Int, min: Int, max: Int): Int {
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return maxOf(min, minOf(max, offset))
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}
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companion object {
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/**
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* The minimum start and end padding for the seekbar preview
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*/
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const val MIN_PADDING = 20
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}
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}
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