From bc30e25cecef745bdb1d19be8d7c04852a4f404c Mon Sep 17 00:00:00 2001
From: Tony Wickham <twickham@google.com>
Date: Thu, 26 Aug 2021 10:18:04 -0700
Subject: [PATCH] Hide taskbar icons when recents button is disabled

The idea is that both taskbar icons and recents navigate you to new apps, which we'd want to disable in similar contexts. Hence reusing FLAG_DISABLE_RECENTS.

Test: locally set FLAG_DISABLE_RECENTS=true, ensure taskbar icons don't show up (both in 3 button mode and gesture nav)
Bug: 193183428
Bug: 194990283
Change-Id: I9537f57dc25663151b1414c5260dadb58506fdb0
---
 .../taskbar/NavbarButtonsViewController.java         |  7 +++++++
 .../launcher3/taskbar/TaskbarActivityContext.java    |  2 ++
 .../launcher3/taskbar/TaskbarViewController.java     | 12 +++++++++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java b/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
index e871c2556d..be9368fcac 100644
--- a/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/NavbarButtonsViewController.java
@@ -260,6 +260,13 @@ public class NavbarButtonsViewController {
         return (mState & FLAG_IME_VISIBLE) != 0;
     }
 
+    /**
+     * Returns true if the recents (overview) button is disabled
+     */
+    public boolean isRecentsDisabled() {
+        return (mState & FLAG_DISABLE_RECENTS) != 0;
+    }
+
     /**
      * Adds the bounds corresponding to all visible buttons to provided region
      */
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java
index 8d7a6dc602..8c12567ccf 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java
@@ -236,6 +236,8 @@ public class TaskbarActivityContext extends ContextThemeWrapper implements Activ
                 systemUiStateFlags, forceUpdate);
         mControllers.taskbarViewController.setImeIsVisible(
                 mControllers.navbarButtonsViewController.isImeVisible());
+        mControllers.taskbarViewController.setRecentsButtonDisabled(
+                mControllers.navbarButtonsViewController.isRecentsDisabled());
         mControllers.taskbarKeyguardController.updateStateForSysuiFlags(systemUiStateFlags);
     }
 
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarViewController.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarViewController.java
index 1882762a67..a4b2e50fa8 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarViewController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarViewController.java
@@ -44,6 +44,8 @@ public class TaskbarViewController {
     public static final int ALPHA_INDEX_IME = 1;
     public static final int ALPHA_INDEX_KEYGUARD = 2;
     public static final int ALPHA_INDEX_STASH = 3;
+    public static final int ALPHA_INDEX_RECENTS_DISABLED = 4;
+    private static final int NUM_ALPHA_CHANNELS = 5;
 
     private final TaskbarActivityContext mActivity;
     private final TaskbarView mTaskbarView;
@@ -67,7 +69,7 @@ public class TaskbarViewController {
     public TaskbarViewController(TaskbarActivityContext activity, TaskbarView taskbarView) {
         mActivity = activity;
         mTaskbarView = taskbarView;
-        mTaskbarIconAlpha = new MultiValueAlpha(mTaskbarView, 4);
+        mTaskbarIconAlpha = new MultiValueAlpha(mTaskbarView, NUM_ALPHA_CHANNELS);
         mTaskbarIconAlpha.setUpdateVisibility(true);
         mModelCallbacks = new TaskbarModelCallbacks(activity, mTaskbarView);
     }
@@ -100,6 +102,14 @@ public class TaskbarViewController {
         mTaskbarView.setTouchesEnabled(!isImeVisible);
     }
 
+    /**
+     * Should be called when the recents button is disabled, so we can hide taskbar icons as well.
+     */
+    public void setRecentsButtonDisabled(boolean isDisabled) {
+        // TODO: check TaskbarStashController#supportsStashing(), to stash instead of setting alpha.
+        mTaskbarIconAlpha.getProperty(ALPHA_INDEX_RECENTS_DISABLED).setValue(isDisabled ? 0 : 1);
+    }
+
     /**
      * Sets OnClickListener and OnLongClickListener for the given view.
      */