Add call tab bottom bar.

app/src/main/java/org/thoughtcrime/securesms/conversation/SignalBottomActionBarController.kt

@@ -0,0 +1,78 @@
+package org.thoughtcrime.securesms.conversation
+
+import android.view.View
+import android.view.ViewTreeObserver
+import androidx.core.view.doOnPreDraw
+import androidx.core.view.isVisible
+import androidx.recyclerview.widget.RecyclerView
+import org.signal.core.util.dp
+import org.thoughtcrime.securesms.components.menu.SignalBottomActionBar
+import org.thoughtcrime.securesms.util.ViewUtil
+import org.thoughtcrime.securesms.util.concurrent.ListenableFuture.Listener
+import java.util.concurrent.ExecutionException
+
+class SignalBottomActionBarController(
+  private val bottomActionBar: SignalBottomActionBar,
+  private val recyclerView: RecyclerView,
+  private val callback: Callback
+) {
+
+  private val additionalScrollOffset = 54.dp
+  private val paddingBottom: Int = recyclerView.paddingBottom
+
+  fun setVisibility(isVisible: Boolean) {
+    val isCurrentlyVisible = bottomActionBar.isVisible
+    if (isVisible == isCurrentlyVisible) {
+      return
+    }
+
+    if (isVisible) {
+      ViewUtil.animateIn(bottomActionBar, bottomActionBar.enterAnimation)
+      callback.onBottomActionBarVisibilityChanged(View.VISIBLE)
+
+      bottomActionBar.viewTreeObserver.addOnPreDrawListener(BecomingVisiblePreDrawListener())
+    } else {
+      ViewUtil
+        .animateOut(bottomActionBar, bottomActionBar.exitAnimation)
+        .addListener(BecomingGoneAnimationListener())
+    }
+  }
+
+  private inner class BecomingVisiblePreDrawListener : ViewTreeObserver.OnPreDrawListener {
+
+    private val bottomPaddingExtra = 18.dp
+
+    override fun onPreDraw(): Boolean {
+      if (bottomActionBar.height == 0 && bottomActionBar.visibility == View.VISIBLE) {
+        return false
+      }
+
+      bottomActionBar.viewTreeObserver.removeOnPreDrawListener(this)
+
+      val bottomPadding = bottomActionBar.height + bottomPaddingExtra
+      ViewUtil.setPaddingBottom(recyclerView, bottomPadding)
+
+      recyclerView.scrollBy(0, -(bottomPadding - additionalScrollOffset))
+
+      return false
+    }
+  }
+
+  private inner class BecomingGoneAnimationListener : Listener<Boolean> {
+    override fun onSuccess(result: Boolean) {
+      val scrollOffset = recyclerView.paddingBottom - additionalScrollOffset
+      callback.onBottomActionBarVisibilityChanged(View.GONE)
+      ViewUtil.setPaddingBottom(recyclerView, paddingBottom)
+
+      recyclerView.doOnPreDraw {
+        recyclerView.scrollBy(0, scrollOffset)
+      }
+    }
+
+    override fun onFailure(e: ExecutionException?) = Unit
+  }
+
+  interface Callback {
+    fun onBottomActionBarVisibilityChanged(visibility: Int)
+  }
+}