Add SCROLL_FLAG_NO_SCROLL flag for AppBarLayout.LayoutParams

PiperOrigin-RevId: 234683507

Author: Material Design Team

lib/java/com/google/android/material/appbar/AppBarLayout.java

@@ -751,6 +751,7 @@ public static class LayoutParams extends LinearLayout.LayoutParams {
     @IntDef(
         flag = true,
         value = {
+          SCROLL_FLAG_NO_SCROLL,
           SCROLL_FLAG_SCROLL,
           SCROLL_FLAG_EXIT_UNTIL_COLLAPSED,
           SCROLL_FLAG_ENTER_ALWAYS,
@@ -761,6 +762,12 @@ public static class LayoutParams extends LinearLayout.LayoutParams {
     @Retention(RetentionPolicy.SOURCE)
     public @interface ScrollFlags {}
 
+    /**
+     * Disable scrolling on the view. This flag should not be combined with any of the other scroll
+     * flags.
+     */
+    public static final int SCROLL_FLAG_NO_SCROLL = 0x0;
+
     /**
      * The view will be scroll in direct relation to scroll events. This flag needs to be set for
      * any of the other flags to take effect. If any sibling views before this one do not have this
@@ -866,7 +873,8 @@ public LayoutParams(LayoutParams source) {
      * @param flags bitwise int of {@link #SCROLL_FLAG_SCROLL}, {@link
      *     #SCROLL_FLAG_EXIT_UNTIL_COLLAPSED}, {@link #SCROLL_FLAG_ENTER_ALWAYS}, {@link
      *     #SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED}, {@link #SCROLL_FLAG_SNAP}, and {@link
-     *     #SCROLL_FLAG_SNAP_MARGINS}.
+     *     #SCROLL_FLAG_SNAP_MARGINS}. Otherwise, use {@link #SCROLL_FLAG_NO_SCROLL} to disable
+     *     scrolling.
      * @see #getScrollFlags()
      * @attr ref com.google.android.material.R.styleable#AppBarLayout_Layout_layout_scrollFlags
      */

lib/java/com/google/android/material/appbar/res/values/attrs.xml

@@ -54,6 +54,10 @@
 
   <declare-styleable name="AppBarLayout_Layout">
     <attr name="layout_scrollFlags">
+      <!-- Disable scrolling on the view. This flag should not be combined with any of the other
+           scroll flags. -->
+      <flag name="noScroll" value="0x0"/>
+
       <!-- The view will be scroll in direct relation to scroll events. This flag needs to be
            set for any of the other flags to take effect. If any sibling views
            before this one do not have this flag, then this value has no effect. -->