From e2a686dca3667f12aaef3f697aceca308ce8d79e Mon Sep 17 00:00:00 2001
From: Winson Chung <winsonc@google.com>
Date: Wed, 17 Apr 2019 16:54:23 -0700
Subject: [PATCH] Check that sysui states before allowing back gesture

- Ensure not in immersive mode, and also that the notification panel is
  not expanded

Bug: 130340004
Bug: 130417141
Test: Manual, ensure back doesn't work when notification panel is down or
      app is in immersive mode

Change-Id: I29f5cd80cc89b28802ca8b2c9e2956ae5b3b1151
---
 .../shared/system/QuickStepContract.java      |  1 +
 .../recents/OverviewProxyService.java         |  8 +++++++
 .../phone/EdgeBackGestureHandler.java         | 21 +++++++++++++------
 .../systemui/statusbar/phone/StatusBar.java   |  6 ++++++
 4 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/system/QuickStepContract.java b/packages/SystemUI/shared/src/com/android/systemui/shared/system/QuickStepContract.java
index b36a88b909b3f..405478415bbe7 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/system/QuickStepContract.java
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/system/QuickStepContract.java
@@ -51,6 +51,7 @@ public class QuickStepContract {
     public static final int SYSUI_STATE_SCREEN_PINNING = 1 << 0;
     public static final int SYSUI_STATE_NAV_BAR_HIDDEN = 1 << 1;
     public static final int SYSUI_STATE_NOTIFICATION_PANEL_EXPANDED = 1 << 2;
+    public static final int SYSUI_STATE_BOUNCER_SHOWING = 1 << 3;
 
     @Retention(RetentionPolicy.SOURCE)
     @IntDef({SYSUI_STATE_SCREEN_PINNING,
diff --git a/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyService.java b/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyService.java
index 56dbe2b2cd993..b2302cccba250 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyService.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/OverviewProxyService.java
@@ -28,6 +28,7 @@ import static com.android.systemui.shared.system.QuickStepContract.KEY_EXTRA_INP
 import static com.android.systemui.shared.system.QuickStepContract.KEY_EXTRA_SUPPORTS_WINDOW_CORNERS;
 import static com.android.systemui.shared.system.QuickStepContract.KEY_EXTRA_SYSUI_PROXY;
 import static com.android.systemui.shared.system.QuickStepContract.KEY_EXTRA_WINDOW_CORNER_RADIUS;
+import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_BOUNCER_SHOWING;
 import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_NAV_BAR_HIDDEN;
 import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_NOTIFICATION_PANEL_EXPANDED;
 import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_SCREEN_PINNING;
@@ -489,12 +490,17 @@ public class OverviewProxyService implements CallbackController<OverviewProxyLis
         }
     }
 
+    public int getSystemUiStateFlags() {
+        return mSysUiStateFlags;
+    }
+
     private void updateSystemUiStateFlags() {
         final NavigationBarController navBar = Dependency.get(NavigationBarController.class);
         final NavigationBarFragment navBarFragment = navBar.getDefaultNavigationBarFragment();
         final StatusBar statusBar = SysUiServiceProvider.getComponent(mContext, StatusBar.class);
         final boolean panelExpanded = statusBar != null && statusBar.getPanel() != null
                 && statusBar.getPanel().isFullyExpanded();
+        final boolean bouncerShowing = statusBar != null && statusBar.isBouncerShowing();
         mSysUiStateFlags = 0;
         mSysUiStateFlags |= ActivityManagerWrapper.getInstance().isScreenPinningActive()
                 ? SYSUI_STATE_SCREEN_PINNING : 0;
@@ -502,6 +508,8 @@ public class OverviewProxyService implements CallbackController<OverviewProxyLis
                 ? SYSUI_STATE_NAV_BAR_HIDDEN : 0;
         mSysUiStateFlags |= panelExpanded
                 ? SYSUI_STATE_NOTIFICATION_PANEL_EXPANDED : 0;
+        mSysUiStateFlags |= bouncerShowing
+                ? SYSUI_STATE_BOUNCER_SHOWING : 0;
         notifySystemUiStateFlags(mSysUiStateFlags);
     }
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/EdgeBackGestureHandler.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/EdgeBackGestureHandler.java
index 1927f2273e40d..8028200a01265 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/EdgeBackGestureHandler.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/EdgeBackGestureHandler.java
@@ -17,6 +17,10 @@ package com.android.systemui.statusbar.phone;
 
 import static android.view.Display.INVALID_DISPLAY;
 
+import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_BOUNCER_SHOWING;
+import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_NAV_BAR_HIDDEN;
+import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_NOTIFICATION_PANEL_EXPANDED;
+
 import android.content.Context;
 import android.content.pm.ParceledListSlice;
 import android.content.res.Resources;
@@ -127,7 +131,7 @@ public class EdgeBackGestureHandler implements DisplayListener {
 
     private final PointF mDownPoint = new PointF();
     private boolean mThresholdCrossed = false;
-    private boolean mIgnoreThisGesture = false;
+    private boolean mAllowGesture = false;
     private boolean mIsOnLeftEdge;
 
     private int mImeHeight = 0;
@@ -285,9 +289,14 @@ public class EdgeBackGestureHandler implements DisplayListener {
 
     private void onMotionEvent(MotionEvent ev) {
         if (ev.getAction() == MotionEvent.ACTION_DOWN) {
-            // Verify if this is in within the touch region
-            mIgnoreThisGesture = !isWithinTouchRegion((int) ev.getX(), (int) ev.getY());
-            if (!mIgnoreThisGesture) {
+            // Verify if this is in within the touch region and we aren't in immersive mode, and
+            // either the bouncer is showing or the notification panel is hidden
+            int stateFlags = mOverviewProxyService.getSystemUiStateFlags();
+            mAllowGesture = (stateFlags & SYSUI_STATE_NAV_BAR_HIDDEN) == 0
+                    && ((stateFlags & SYSUI_STATE_BOUNCER_SHOWING) == SYSUI_STATE_BOUNCER_SHOWING
+                            || (stateFlags & SYSUI_STATE_NOTIFICATION_PANEL_EXPANDED) == 0)
+                    && isWithinTouchRegion((int) ev.getX(), (int) ev.getY());
+            if (mAllowGesture) {
                 mIsOnLeftEdge = ev.getX() < mEdgeWidth;
                 mEdgePanelLp.gravity = mIsOnLeftEdge
                         ? (Gravity.LEFT | Gravity.TOP)
@@ -302,13 +311,13 @@ public class EdgeBackGestureHandler implements DisplayListener {
                 mThresholdCrossed = false;
                 mEdgePanel.handleTouch(ev);
             }
-        } else if (!mIgnoreThisGesture) {
+        } else if (mAllowGesture) {
             if (!mThresholdCrossed && ev.getAction() == MotionEvent.ACTION_MOVE) {
                 float dx = Math.abs(ev.getX() - mDownPoint.x);
                 float dy = Math.abs(ev.getY() - mDownPoint.y);
                 if (dy > dx && dy > mTouchSlop) {
                     // Send action cancel to reset all the touch events
-                    mIgnoreThisGesture = true;
+                    mAllowGesture = false;
                     MotionEvent cancelEv = MotionEvent.obtain(ev);
                     cancelEv.setAction(MotionEvent.ACTION_CANCEL);
                     mEdgePanel.handleTouch(cancelEv);
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
index 9fccf9132fc87..251c0600b1f01 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
@@ -30,6 +30,7 @@ import static com.android.systemui.Dependency.MAIN_HANDLER;
 import static com.android.systemui.keyguard.WakefulnessLifecycle.WAKEFULNESS_ASLEEP;
 import static com.android.systemui.keyguard.WakefulnessLifecycle.WAKEFULNESS_AWAKE;
 import static com.android.systemui.keyguard.WakefulnessLifecycle.WAKEFULNESS_WAKING;
+import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_BOUNCER_SHOWING;
 import static com.android.systemui.shared.system.WindowManagerWrapper.NAV_BAR_POS_INVALID;
 import static com.android.systemui.shared.system.WindowManagerWrapper.NAV_BAR_POS_LEFT;
 import static com.android.systemui.statusbar.NotificationLockscreenUserManager.PERMISSION_SELF;
@@ -166,6 +167,7 @@ import com.android.systemui.plugins.statusbar.NotificationSwipeActionHelper.Snoo
 import com.android.systemui.plugins.statusbar.StatusBarStateController;
 import com.android.systemui.qs.QSFragment;
 import com.android.systemui.qs.QSPanel;
+import com.android.systemui.recents.OverviewProxyService;
 import com.android.systemui.recents.Recents;
 import com.android.systemui.recents.ScreenPinningRequest;
 import com.android.systemui.shared.system.WindowManagerWrapper;
@@ -3582,6 +3584,10 @@ public class StatusBar extends SystemUI implements DemoMode,
         if (!mBouncerShowing) {
             updatePanelExpansionForKeyguard();
         }
+
+        // Notify overview proxy service of the new states
+        Dependency.get(OverviewProxyService.class).setSystemUiStateFlag(SYSUI_STATE_BOUNCER_SHOWING,
+                isBouncerShowing());
     }
 
     /**