1 files changed, 64 insertions, 0 deletions
diff --git a/mobile/android/geckoview_example/src/main/java/org/mozilla/geckoview_example/ToolbarBottomBehavior.java b/mobile/android/geckoview_example/src/main/java/org/mozilla/geckoview_example/ToolbarBottomBehavior.java
new file mode 100644
index 0000000000..af4d3a1e98
--- /dev/null
+++ b/mobile/android/geckoview_example/src/main/java/org/mozilla/geckoview_example/ToolbarBottomBehavior.java
@@ -0,0 +1,64 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.geckoview_example;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.core.view.ViewCompat;
+import org.mozilla.geckoview.PanZoomController;
+
+public class ToolbarBottomBehavior extends CoordinatorLayout.Behavior<View> {
+  public ToolbarBottomBehavior(Context context, AttributeSet attributeSet) {
+    super(context, attributeSet);
+  }
+
+  @Override
+  public boolean onStartNestedScroll(
+      CoordinatorLayout coordinatorLayout,
+      View child,
+      View directTargetChild,
+      View target,
+      int axes,
+      int type) {
+    NestedGeckoView geckoView = (NestedGeckoView) target;
+    if (axes == ViewCompat.SCROLL_AXIS_VERTICAL
+        && geckoView.getInputResult() == PanZoomController.INPUT_RESULT_HANDLED) {
+      return true;
+    }
+
+    if (geckoView.getInputResult() == PanZoomController.INPUT_RESULT_UNHANDLED) {
+      // Restore the toolbar to the original (visible) state, this is what A-C does.
+      child.setTranslationY(0f);
+    }
+
+    return false;
+  }
+
+  @Override
+  public void onStopNestedScroll(
+      CoordinatorLayout coordinatorLayout, View child, View target, int type) {
+    // Snap up or down the user stops scrolling.
+    if (child.getTranslationY() >= (child.getHeight() / 2f)) {
+      child.setTranslationY(child.getHeight());
+    } else {
+      child.setTranslationY(0f);
+    }
+  }
+
+  @Override
+  public void onNestedPreScroll(
+      CoordinatorLayout coordinatorLayout,
+      View child,
+      View target,
+      int dx,
+      int dy,
+      int[] consumed,
+      int type) {
+    super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type);
+    child.setTranslationY(Math.max(0f, Math.min(child.getHeight(), child.getTranslationY() + dy)));
+  }
+}