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import android.app.Activity
import android.graphics.Rect
import android.os.Build
import android.view.View
import android.view.ViewTreeObserver
import android.view.inputmethod.InputMethodManager
/**
* Created by mikepenz on 14.03.15.
* This class implements a hack to change the layout padding on bottom if the keyboard is shown
* to allow long lists with editTextViews
* Basic idea for this solution found here: http://stackoverflow.com/a/9108219/325479
*/
class KeyboardUtil(act: Activity, private val contentView: View) {
private val decorView: View = act.window.decorView
//a small helper to allow showing the editText focus
var onGlobalLayoutListener: ViewTreeObserver.OnGlobalLayoutListener = ViewTreeObserver.OnGlobalLayoutListener {
val r = Rect()
//r will be populated with the coordinates of your view that area still visible.
decorView.getWindowVisibleDisplayFrame(r)
//get screen height and calculate the difference with the useable area from the r
val height = decorView.context.resources.displayMetrics.heightPixels
val diff = height - r.bottom
//if it could be a keyboard add the padding to the view
if (diff != 0) {
// if the use-able screen height differs from the total screen height we assume that it shows a keyboard now
//check if the padding is 0 (if yes set the padding for the keyboard)
if (contentView.paddingBottom != diff) {
//set the padding of the contentView for the keyboard
contentView.setPadding(0, 0, 0, diff)
}
} else {
//check if the padding is != 0 (if yes reset the padding)
if (contentView.paddingBottom != 0) {
//reset the padding of the contentView
contentView.setPadding(0, 0, 0, 0)
}
}
}
init {
//only required on newer android versions. it was working on API level 19
if (Build.VERSION.SDK_INT >= 19) {
decorView.viewTreeObserver.addOnGlobalLayoutListener(onGlobalLayoutListener)
}
}
fun enable() {
if (Build.VERSION.SDK_INT >= 19) {
decorView.viewTreeObserver.addOnGlobalLayoutListener(onGlobalLayoutListener)
}
}
fun disable() {
if (Build.VERSION.SDK_INT >= 19) {
decorView.viewTreeObserver.removeOnGlobalLayoutListener(onGlobalLayoutListener)
}
}
companion object {
/**
* Helper to hide the keyboard
*
* @param act
*/
fun hideKeyboard(act: Activity?) {
if (act != null && act.currentFocus != null) {
val inputMethodManager = act.getSystemService(Activity.INPUT_METHOD_SERVICE) as InputMethodManager
inputMethodManager.hideSoftInputFromWindow(act.currentFocus!!.windowToken, 0)
}
}
}
}
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