Move AllAppsButton placement for desktop environment.

On desktop environment, we want the AllAppsButton to be on the left side
of the taskbar instead of the hotseat, but retain the functionality of
the button.

Bug: 251372204
Test: Manual
Change-Id: Ia2c95a20583cb98785ab6f8c719559d93982c06f
diff --git a/quickstep/src/com/android/launcher3/taskbar/DesktopNavbarButtonsViewController.java b/quickstep/src/com/android/launcher3/taskbar/DesktopNavbarButtonsViewController.java
index 0ab3cfd5..48481d8 100644
--- a/quickstep/src/com/android/launcher3/taskbar/DesktopNavbarButtonsViewController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/DesktopNavbarButtonsViewController.java
@@ -18,6 +18,8 @@
 import static com.android.launcher3.taskbar.TaskbarNavButtonController.BUTTON_NOTIFICATIONS;
 import static com.android.launcher3.taskbar.TaskbarNavButtonController.BUTTON_QUICK_SETTINGS;
 
+import android.view.LayoutInflater;
+import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 
@@ -31,6 +33,8 @@
     private final TaskbarActivityContext mContext;
     private final FrameLayout mNavButtonsView;
     private final ViewGroup mNavButtonContainer;
+    private final ViewGroup mStartContextualContainer;
+    private final View mAllAppsButton;
 
     private TaskbarControllers mControllers;
 
@@ -40,6 +44,12 @@
         mContext = context;
         mNavButtonsView = navButtonsView;
         mNavButtonContainer = mNavButtonsView.findViewById(R.id.end_nav_buttons);
+        mStartContextualContainer = mNavButtonsView.findViewById(R.id.start_contextual_buttons);
+        mAllAppsButton = LayoutInflater.from(context)
+                .inflate(R.layout.taskbar_all_apps_button, mStartContextualContainer, false);
+        mAllAppsButton.setOnClickListener((View v) -> {
+            mControllers.taskbarAllAppsController.show();
+        });
     }
 
     /**
@@ -57,6 +67,8 @@
         addButton(R.drawable.ic_sysbar_notifications, BUTTON_NOTIFICATIONS,
                 mNavButtonContainer, mControllers.navButtonController,
                 R.id.notifications_button);
+        // All apps button
+        mStartContextualContainer.addView(mAllAppsButton);
     }
 
     /** Cleans up on destroy */
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
index 31c2132..f3eff46 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
@@ -17,6 +17,7 @@
 
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.content.res.Resources;
 import android.graphics.Canvas;
 import android.graphics.Rect;
@@ -126,6 +127,9 @@
             mAllAppsButton = LayoutInflater.from(context)
                     .inflate(R.layout.taskbar_all_apps_button, this, false);
             mAllAppsButton.setPadding(mItemPadding, mItemPadding, mItemPadding, mItemPadding);
+            if (mActivityContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_PC)) {
+                mAllAppsButton.setVisibility(GONE);
+            }
         }
 
         // TODO: Disable touch events on QSB otherwise it can crash.