[Android] Create an AppBarLayout behavior preventing the toolbar expansion

[Nicolas Pomepuy]

vlc-android | branch: master | Nicolas Pomepuy <nicolas at videolabs.io> | Thu Mar 17 08:54:23 2022 +0100| [7629f8ada6fedecfabbdf0c4ad95bffadcef73a8] | committer: Nicolas Pomepuy

Create an AppBarLayout behavior preventing the toolbar expansion

> https://code.videolan.org/videolan/vlc-android/commit/7629f8ada6fedecfabbdf0c4ad95bffadcef73a8
---

 .../vlc-android/res/layout/playlist_activity.xml   |  3 +-
 .../gui/helpers/ExpandStateAppBarLayoutBehavior.kt | 44 ++++++++++++++++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/application/vlc-android/res/layout/playlist_activity.xml b/application/vlc-android/res/layout/playlist_activity.xml
index 6e81b400b..cad94f33f 100644
--- a/application/vlc-android/res/layout/playlist_activity.xml
+++ b/application/vlc-android/res/layout/playlist_activity.xml
@@ -23,7 +23,8 @@
                 android:id="@+id/appbar"
                 android:layout_width="match_parent"
                 android:layout_height="@dimen/info_appbar_height"
-                android:fitsSystemWindows="true">
+                android:fitsSystemWindows="true"
+                vlc:layout_behavior="org.videolan.vlc.gui.helpers.ExpandStateAppBarLayoutBehavior">
 
             <com.google.android.material.appbar.CollapsingToolbarLayout
                     android:id="@+id/collapsing_toolbar"
diff --git a/application/vlc-android/src/org/videolan/vlc/gui/helpers/ExpandStateAppBarLayoutBehavior.kt b/application/vlc-android/src/org/videolan/vlc/gui/helpers/ExpandStateAppBarLayoutBehavior.kt
new file mode 100644
index 000000000..bdf3c6771
--- /dev/null
+++ b/application/vlc-android/src/org/videolan/vlc/gui/helpers/ExpandStateAppBarLayoutBehavior.kt
@@ -0,0 +1,44 @@
+/*
+ * ************************************************************************
+ *  DisableableAppBarLayoutBehavior.java
+ * *************************************************************************
+ * Copyright © 2022 VLC authors and VideoLAN
+ * Author: Nicolas POMEPUY
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ * **************************************************************************
+ *
+ *
+ */
+package org.videolan.vlc.gui.helpers
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.MotionEvent
+import android.view.View
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import com.google.android.material.appbar.AppBarLayout
+
+class ExpandStateAppBarLayoutBehavior(context: Context, attrs: AttributeSet) : AppBarLayout.Behavior(context, attrs) {
+    var scrollEnabled = true
+
+    override fun onStartNestedScroll(parent: CoordinatorLayout, child: AppBarLayout, directTargetChild: View, target: View, nestedScrollAxes: Int, type: Int): Boolean {
+        return scrollEnabled && super.onStartNestedScroll(parent, child, directTargetChild, target, nestedScrollAxes, type)
+    }
+
+    override fun onTouchEvent(parent: CoordinatorLayout, child: AppBarLayout, ev: MotionEvent): Boolean {
+        if (!scrollEnabled) return false
+        return super.onTouchEvent(parent, child, ev)
+    }
+}
\ No newline at end of file