commit 76cf236596d395d6936d37208bd99e46f89b4893
author Tony Wickham <twickham@google.com> Tue Mar 20 14:13:16 2018 -0700
committer Tony Wickham <twickham@google.com> Tue Mar 20 14:18:34 2018 -0700
tree a2e58baae8ab496162091d4faac4cc5c5237b694
parent ada91b94ab9d4daeff3937e9884e8519562531e1

Hide back button in drag-n-drop and quick scrub

Add a state flag to hide the back button, used by NORMAL, SPRING_LOADED,
and FAST_OVERVIEW states.

Bug: 74390697
Change-Id: Ifdb2aa41691db4594ea597fc5b5839967711b43d

src/com/android/launcher3/LauncherState.java

diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index 9fef64a..d5a2120 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -60,6 +60,7 @@
     protected static final int FLAG_ALL_APPS_SCRIM = 1 << 7;
     protected static final int FLAG_DISABLE_INTERACTION = 1 << 8;
     protected static final int FLAG_OVERVIEW_UI = 1 << 9;
+    protected static final int FLAG_HIDE_BACK_BUTTON = 1 << 10;
 
     protected static final PageAlphaProvider DEFAULT_ALPHA_PROVIDER =
             new PageAlphaProvider(ACCEL_2) {
@@ -75,7 +76,7 @@
      * TODO: Create a separate class for NORMAL state.
      */
     public static final LauncherState NORMAL = new LauncherState(0, ContainerType.WORKSPACE,
-            0, FLAG_DISABLE_RESTORE | FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED);
+            0, FLAG_DISABLE_RESTORE | FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED | FLAG_HIDE_BACK_BUTTON);
 
     /**
      * Various Launcher states arranged in the increasing order of UI layers
@@ -140,6 +141,12 @@
      */
     public final boolean overviewUi;
 
+    /**
+     * True if the back button should be hidden when in this state (assuming no floating views are
+     * open, launcher has window focus, etc).
+     */
+    public final boolean hideBackButton;
+
     public LauncherState(int id, int containerType, int transitionDuration, int flags) {
         this.containerType = containerType;
         this.transitionDuration = transitionDuration;
@@ -157,6 +164,7 @@
         this.disablePageClipping = (flags & FLAG_DISABLE_PAGE_CLIPPING) != 0;
         this.disableInteraction = (flags & FLAG_DISABLE_INTERACTION) != 0;
         this.overviewUi = (flags & FLAG_OVERVIEW_UI) != 0;
+        this.hideBackButton = (flags & FLAG_HIDE_BACK_BUTTON) != 0;
 
         this.ordinal = id;
         sAllStates[id] = this;

src/com/android/launcher3/states/SpringLoadedState.java

diff --git a/src/com/android/launcher3/states/SpringLoadedState.java b/src/com/android/launcher3/states/SpringLoadedState.java
index 89a9e2d..90d3821 100644
--- a/src/com/android/launcher3/states/SpringLoadedState.java
+++ b/src/com/android/launcher3/states/SpringLoadedState.java
@@ -35,7 +35,7 @@
 
     private static final int STATE_FLAGS = FLAG_SHOW_SCRIM | FLAG_MULTI_PAGE |
             FLAG_DISABLE_ACCESSIBILITY | FLAG_DISABLE_RESTORE | FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED |
-            FLAG_DISABLE_PAGE_CLIPPING | FLAG_PAGE_BACKGROUNDS;
+            FLAG_DISABLE_PAGE_CLIPPING | FLAG_PAGE_BACKGROUNDS | FLAG_HIDE_BACK_BUTTON;
 
     public SpringLoadedState(int id) {
         super(id, ContainerType.OVERVIEW, SPRING_LOADED_TRANSITION_MS, STATE_FLAGS);