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November 4, 2017 00:28
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Android View Kotlin extension for a one-shot callback after layout
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| fun View.afterLayout(block: View.() -> Unit) { | |
| val originalVto = viewTreeObserver | |
| originalVto.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener { | |
| override fun onPreDraw(): Boolean { | |
| if (originalVto.isAlive) originalVto.removeOnPreDrawListener(this) | |
| viewTreeObserver.removeOnPreDrawListener(this) | |
| block(this@afterLayout) | |
| return true | |
| } | |
| }) | |
| } |
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| // usage | |
| image_view.afterLayout { Log.d("demo", "image width $width height $height") } |
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