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Make FAB appear again after it has been hidden

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This commit is contained in:
serso 2017-07-24 12:10:47 +02:00
parent cc75b1f7b1
commit e6aa39659f
1 changed files with 16 additions and 3 deletions
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19
app/src/main/java/org/solovyev/android/calculator/view/PagerViewFabBehavior.java
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@ -1,6 +1,7 @@
package org.solovyev.android.calculator.view;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.view.ViewCompat;
@ -11,6 +12,18 @@ import android.view.View;
public class PagerViewFabBehavior extends FloatingActionButton.Behavior {
@NonNull
private final FloatingActionButton.OnVisibilityChangedListener
visibilityListener = new FloatingActionButton.OnVisibilityChangedListener() {
@Override
public void onHidden(FloatingActionButton fab) {
// by default, FloatingActionButton#hide causes FAB to be GONE which blocks any
// consequent scroll updates in CoordinatorLayout#onNestedScroll. Let's make the
// FAB invisible instead
fab.setVisibility(View.INVISIBLE);
}
};
public PagerViewFabBehavior() {
super();
}
@ -49,13 +62,13 @@ public class PagerViewFabBehavior extends FloatingActionButton.Behavior {
private boolean onScroll(FloatingActionButton child, float scrollX, float scrollY) {
if (scrollY > 0 && child.getVisibility() == View.VISIBLE) {
child.hide();
child.hide(visibilityListener);
return true;
} else if (scrollY < 0 && child.getVisibility() != View.VISIBLE) {
child.show();
child.show(visibilityListener);
return true;
} else if (scrollX != 0 && child.getVisibility() != View.VISIBLE) {
child.show();
child.show(visibilityListener);
return true;
}
return false;