Created
February 12, 2019 17:44
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Resize viewgroup height when swiping over it
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| package com.dertyp7214.experimantaltests | |
| import android.os.Bundle | |
| import androidx.appcompat.app.AppCompatActivity | |
| import /*package*/.dp | |
| import /*package*/.resetHeight | |
| import /*package*/.resizeOnTouch | |
| class Activity : AppCompatActivity() { | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| setContentView(/*layout*/) | |
| viewGroup.resizeOnTouch(minHeight = 50.dp(this)) | |
| } | |
| override fun onBackPressed() { | |
| viewGroup.resetHeight(50.dp(this)) | |
| } | |
| } |
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| import android.content.Context | |
| fun Int.dp(context: Context): Int { | |
| val scale = context.resources.displayMetrics.density | |
| return (this * scale + 0.5f).toInt() | |
| } |
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| import android.transition.ChangeBounds | |
| import android.transition.TransitionManager | |
| import android.view.MotionEvent.ACTION_DOWN | |
| import android.view.MotionEvent.ACTION_MOVE | |
| import android.view.ViewGroup | |
| import android.view.animation.AccelerateDecelerateInterpolator | |
| fun ViewGroup.resizeOnTouch( | |
| remove: Boolean = false, | |
| tolerance: Int = -1, | |
| minHeight: Int = -1, | |
| maxHeight: Int = -1 | |
| ) { | |
| var allowMove = false | |
| if (remove) setOnTouchListener { _, _ -> true } | |
| else setOnTouchListener { _, event -> | |
| val y = event.y | |
| when (event.action) { | |
| ACTION_DOWN -> { | |
| allowMove = tolerance == -1 || (y >= layoutParams.height - tolerance && y <= layoutParams.height + tolerance) | |
| } | |
| ACTION_MOVE -> { | |
| if (allowMove) { | |
| layoutParams.height = if (minHeight != -1 && y < minHeight) minHeight else { | |
| if (maxHeight != -1 && y > maxHeight) maxHeight else { | |
| val parentHeight = (parent as ViewGroup).height | |
| if (y > parentHeight && parentHeight != -1) parentHeight | |
| else y.toInt() | |
| } | |
| } | |
| requestLayout() | |
| } | |
| } | |
| } | |
| true | |
| } | |
| } | |
| val ViewGroup.isMaxHeight: Boolean | |
| get() = (parent as ViewGroup).height == layoutParams.height | |
| fun ViewGroup.resetHeight(height: Int) { | |
| ChangeBounds().apply { | |
| startDelay = 0 | |
| interpolator = AccelerateDecelerateInterpolator() | |
| duration = resources.getInteger(android.R.integer.config_longAnimTime).toLong() | |
| TransitionManager.beginDelayedTransition(this@resetHeight, this) | |
| } | |
| layoutParams.height = height | |
| requestLayout() | |
| } |
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