Merge 2e57587c29883df8fa1c026383d9fab9a09c0291 on remote branch

Change-Id: I59ba50452dadae8ec49b1fea3c78e2b6fd3ed6ae

1 files changed, 123 insertions, 18 deletions

diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarNavButtonController.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarNavButtonController.java
index 3b5afad691..d23336505a 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarNavButtonController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarNavButtonController.java
@@ -16,13 +16,18 @@
 
 package com.android.launcher3.taskbar;
 
-import static android.view.Display.DEFAULT_DISPLAY;
 
-import android.content.Intent;
-import android.view.inputmethod.InputMethodManager;
+import static com.android.internal.app.AssistUtils.INVOCATION_TYPE_HOME_BUTTON_LONG_PRESS;
+import static com.android.internal.app.AssistUtils.INVOCATION_TYPE_KEY;
+import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_SCREEN_PINNING;
+
+import android.os.Bundle;
+import android.os.Handler;
 
 import androidx.annotation.IntDef;
 
+import com.android.launcher3.testing.TestLogging;
+import com.android.launcher3.testing.TestProtocol;
 import com.android.quickstep.OverviewCommandHelper;
 import com.android.quickstep.SystemUiProxy;
 import com.android.quickstep.TouchInteractionService;
@@ -34,17 +39,23 @@ import java.lang.annotation.RetentionPolicy;
  * Controller for 3 button mode in the taskbar.
  * Handles all the functionality of the various buttons, making/routing the right calls into
  * launcher or sysui/system.
- *
- * TODO: Create callbacks to hook into UI layer since state will change for more context buttons/
- *       assistant invocation.
  */
 public class TaskbarNavButtonController {
+
+    /** Allow some time in between the long press for back and recents. */
+    static final int SCREEN_PIN_LONG_PRESS_THRESHOLD = 200;
+    static final int SCREEN_PIN_LONG_PRESS_RESET = SCREEN_PIN_LONG_PRESS_THRESHOLD + 100;
+
+    private long mLastScreenPinLongPress;
+    private boolean mScreenPinned;
+
     @Retention(RetentionPolicy.SOURCE)
     @IntDef(value = {
             BUTTON_BACK,
             BUTTON_HOME,
             BUTTON_RECENTS,
-            BUTTON_IME_SWITCH
+            BUTTON_IME_SWITCH,
+            BUTTON_A11Y,
     })
 
     public @interface TaskbarButton {}
@@ -53,11 +64,22 @@ public class TaskbarNavButtonController {
     static final int BUTTON_HOME = BUTTON_BACK << 1;
     static final int BUTTON_RECENTS = BUTTON_HOME << 1;
     static final int BUTTON_IME_SWITCH = BUTTON_RECENTS << 1;
+    static final int BUTTON_A11Y = BUTTON_IME_SWITCH << 1;
+
+    private static final int SCREEN_UNPIN_COMBO = BUTTON_BACK | BUTTON_RECENTS;
+    private int mLongPressedButtons = 0;
 
     private final TouchInteractionService mService;
+    private final SystemUiProxy mSystemUiProxy;
+    private final Handler mHandler;
+
+    private final Runnable mResetLongPress = this::resetScreenUnpin;
 
-    public TaskbarNavButtonController(TouchInteractionService service) {
+    public TaskbarNavButtonController(TouchInteractionService service,
+            SystemUiProxy systemUiProxy, Handler handler) {
         mService = service;
+        mSystemUiProxy = systemUiProxy;
+        mHandler = handler;
     }
 
     public void onButtonClick(@TaskbarButton int buttonType) {
@@ -69,32 +91,115 @@ public class TaskbarNavButtonController {
                 navigateHome();
                 break;
             case BUTTON_RECENTS:
-                navigateToOverview();;
+                navigateToOverview();
                 break;
             case BUTTON_IME_SWITCH:
                 showIMESwitcher();
                 break;
+            case BUTTON_A11Y:
+                notifyA11yClick(false /* longClick */);
+                break;
+        }
+    }
+
+    public boolean onButtonLongClick(@TaskbarButton int buttonType) {
+        switch (buttonType) {
+            case BUTTON_HOME:
+                startAssistant();
+                return true;
+            case BUTTON_A11Y:
+                notifyA11yClick(true /* longClick */);
+                return true;
+            case BUTTON_BACK:
+            case BUTTON_RECENTS:
+                mLongPressedButtons |= buttonType;
+                return determineScreenUnpin();
+            case BUTTON_IME_SWITCH:
+            default:
+                return false;
+        }
+    }
+
+    /**
+     * Checks if the user has long pressed back and recents buttons
+     * "together" (within {@link #SCREEN_PIN_LONG_PRESS_THRESHOLD})ms
+     * If so, then requests the system to turn off screen pinning.
+     *
+     * @return true if the long press is a valid user action in attempting to unpin an app
+     *         Will always return {@code false} when screen pinning is not active.
+     *         NOTE: Returning true does not mean that screen pinning has stopped
+     */
+    private boolean determineScreenUnpin() {
+        long timeNow = System.currentTimeMillis();
+        if (!mScreenPinned) {
+            return false;
+        }
+
+        if (mLastScreenPinLongPress == 0) {
+            // First button long press registered, just mark time and wait for second button press
+            mLastScreenPinLongPress = System.currentTimeMillis();
+            mHandler.postDelayed(mResetLongPress, SCREEN_PIN_LONG_PRESS_RESET);
+            return true;
+        }
+
+        if ((timeNow - mLastScreenPinLongPress) > SCREEN_PIN_LONG_PRESS_THRESHOLD) {
+            // Too long in-between presses, reset the clock
+            resetScreenUnpin();
+            return false;
         }
+
+        if ((mLongPressedButtons & SCREEN_UNPIN_COMBO) == SCREEN_UNPIN_COMBO) {
+            // Hooray! They did it (finally...)
+            mSystemUiProxy.stopScreenPinning();
+            mHandler.removeCallbacks(mResetLongPress);
+            resetScreenUnpin();
+        }
+        return true;
+    }
+
+    private void resetScreenUnpin() {
+        mLongPressedButtons = 0;
+        mLastScreenPinLongPress = 0;
+    }
+
+    public void updateSysuiFlags(int sysuiFlags) {
+        mScreenPinned = (sysuiFlags & SYSUI_STATE_SCREEN_PINNING) != 0;
     }
 
     private void navigateHome() {
-        mService.startActivity(new Intent(Intent.ACTION_MAIN)
-                .addCategory(Intent.CATEGORY_HOME)
-                .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
+        mService.getOverviewCommandHelper().addCommand(OverviewCommandHelper.TYPE_HOME);
     }
 
     private void navigateToOverview() {
-        mService.getOverviewCommandHelper()
-                .addCommand(OverviewCommandHelper.TYPE_SHOW);
+        if (mScreenPinned) {
+            return;
+        }
+        TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onOverviewToggle");
+        mService.getOverviewCommandHelper().addCommand(OverviewCommandHelper.TYPE_TOGGLE);
     }
 
     private void executeBack() {
-        SystemUiProxy.INSTANCE.getNoCreate().onBackPressed();
+        mSystemUiProxy.onBackPressed();
     }
 
     private void showIMESwitcher() {
-        mService.getSystemService(InputMethodManager.class)
-                .showInputMethodPickerFromSystem(true /* showAuxiliarySubtypes */,
-                        DEFAULT_DISPLAY);
+        mSystemUiProxy.onImeSwitcherPressed();
+    }
+
+    private void notifyA11yClick(boolean longClick) {
+        if (longClick) {
+            mSystemUiProxy.notifyAccessibilityButtonLongClicked();
+        } else {
+            mSystemUiProxy.notifyAccessibilityButtonClicked(mService.getDisplayId());
+        }
+    }
+
+    private void startAssistant() {
+        if (mScreenPinned) {
+            return;
+        }
+        Bundle args = new Bundle();
+        args.putInt(INVOCATION_TYPE_KEY, INVOCATION_TYPE_HOME_BUTTON_LONG_PRESS);
+        mSystemUiProxy.startAssistant(args);
     }
 }