From 87d752062e9df6fffa7beb907b899cac69359f11 Mon Sep 17 00:00:00 2001
From: Lucas Dupin <dupin@google.com>
Date: Wed, 28 Jul 2021 10:24:54 -0700
Subject: [PATCH] Add depth to -1 screen

Wallpaper will zoom out as you drag the overlay

Test: manually pull overlay
Fixes: 192502999
Change-Id: I9067b70d10497d4e16a5ef601161fbedfa9307e1
---
 .../launcher3/BaseQuickstepLauncher.java      | 11 ++++++++++
 .../statehandlers/DepthController.java        | 16 +++++++++++++++
 src/com/android/launcher3/Launcher.java       | 20 +++++++++++--------
 3 files changed, 39 insertions(+), 8 deletions(-)

diff --git a/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java b/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
index 5250d18724..e1d05746af 100644
--- a/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
+++ b/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
@@ -210,6 +210,17 @@ public abstract class BaseQuickstepLauncher extends Launcher
         }
     }
 
+    /**
+     * {@code LauncherOverlayCallbacks} scroll amount.
+     * Indicates transition progress to -1 screen.
+     * @param progress From 0 to 1.
+     */
+    @Override
+    public void onScrollChanged(float progress) {
+        super.onScrollChanged(progress);
+        mDepthController.onOverlayScrollChanged(progress);
+    }
+
     @Override
     public void startIntentSenderForResult(IntentSender intent, int requestCode,
             Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options) {
diff --git a/quickstep/src/com/android/launcher3/statehandlers/DepthController.java b/quickstep/src/com/android/launcher3/statehandlers/DepthController.java
index 370fb8ef7c..f01ff8bd5d 100644
--- a/quickstep/src/com/android/launcher3/statehandlers/DepthController.java
+++ b/quickstep/src/com/android/launcher3/statehandlers/DepthController.java
@@ -116,6 +116,10 @@ public class DepthController implements StateHandler<LauncherState>,
     private boolean mCrossWindowBlursEnabled;
     private WallpaperManagerCompat mWallpaperManager;
     private SurfaceControl mSurface;
+    /**
+     * How visible the -1 overlay is, from 0 to 1.
+     */
+    private float mOverlayScrollProgress;
     /**
      * Ratio from 0 to 1, where 0 is fully zoomed out, and 1 is zoomed in.
      * @see android.service.wallpaper.WallpaperService.Engine#onZoomChanged(float)
@@ -251,12 +255,24 @@ public class DepthController implements StateHandler<LauncherState>,
         }
     }
 
+    public void onOverlayScrollChanged(float progress) {
+        // Round out the progress to dedupe frequent, non-perceptable updates
+        int progressI = (int) (progress * 256);
+        float progressF = progressI / 256f;
+        if (Float.compare(mOverlayScrollProgress, progressF) == 0) {
+            return;
+        }
+        mOverlayScrollProgress = progressF;
+        dispatchTransactionSurface(mDepth);
+    }
+
     private boolean dispatchTransactionSurface(float depth) {
         boolean supportsBlur = BlurUtils.supportsBlursOnWindows();
         if (supportsBlur && (mSurface == null || !mSurface.isValid())) {
             return false;
         }
         ensureDependencies();
+        depth = Math.max(depth, mOverlayScrollProgress);
         IBinder windowToken = mLauncher.getRootView().getWindowToken();
         if (windowToken != null) {
             mWallpaperManager.setWallpaperZoomOut(windowToken, depth);
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index e736022772..07c211353f 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -222,7 +222,8 @@ import java.util.stream.Stream;
  * Default launcher application.
  */
 public class Launcher extends StatefulActivity<LauncherState> implements LauncherExterns,
-        Callbacks, InvariantDeviceProfile.OnIDPChangeListener, PluginListener<OverlayPlugin> {
+        Callbacks, InvariantDeviceProfile.OnIDPChangeListener, PluginListener<OverlayPlugin>,
+        LauncherOverlayCallbacks {
     public static final String TAG = "Launcher";
 
     public static final ActivityTracker<Launcher> ACTIVITY_TRACKER = new ActivityTracker<>();
@@ -622,7 +623,7 @@ public class Launcher extends StatefulActivity<LauncherState> implements Launche
     @Override
     public void setLauncherOverlay(LauncherOverlay overlay) {
         if (overlay != null) {
-            overlay.setOverlayCallbacks(new LauncherOverlayCallbacksImpl());
+            overlay.setOverlayCallbacks(this);
         }
         mWorkspace.setLauncherOverlay(overlay);
     }
@@ -1126,12 +1127,15 @@ public class Launcher extends StatefulActivity<LauncherState> implements Launche
         mAppWidgetHost.setActivityResumed(false);
     }
 
-    class LauncherOverlayCallbacksImpl implements LauncherOverlayCallbacks {
-
-        public void onScrollChanged(float progress) {
-            if (mWorkspace != null) {
-                mWorkspace.onOverlayScrollChanged(progress);
-            }
+    /**
+     * {@code LauncherOverlayCallbacks} scroll amount.
+     * Indicates transition progress to -1 screen.
+     * @param progress From 0 to 1.
+     */
+    @Override
+    public void onScrollChanged(float progress) {
+        if (mWorkspace != null) {
+            mWorkspace.onOverlayScrollChanged(progress);
         }
     }