Making caret visibility part of state definition

> Hiding the caret in fast overview state
> Hiding caret in task swipe down interaction

Bug: 79700605
Change-Id: I984d535bc75802501e8aeb13c8f37387f331e5bc
diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index fbe27b0..76681f2 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -51,6 +51,7 @@
     public static final int ALL_APPS_HEADER = 1 << 2;
     public static final int ALL_APPS_HEADER_EXTRA = 1 << 3; // e.g. app predictions
     public static final int ALL_APPS_CONTENT = 1 << 4;
+    public static final int VERTICAL_SWIPE_INDICATOR = 1 << 5;
 
     protected static final int FLAG_MULTI_PAGE = 1 << 0;
     protected static final int FLAG_DISABLE_ACCESSIBILITY = 1 << 1;
@@ -201,9 +202,9 @@
 
     public int getVisibleElements(Launcher launcher) {
         if (launcher.getDeviceProfile().isVerticalBarLayout()) {
-            return HOTSEAT_ICONS;
+            return HOTSEAT_ICONS | VERTICAL_SWIPE_INDICATOR;
         }
-        return HOTSEAT_ICONS | HOTSEAT_SEARCH_BOX;
+        return HOTSEAT_ICONS | HOTSEAT_SEARCH_BOX | VERTICAL_SWIPE_INDICATOR;
     }
 
     /**
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index 2c3e3ee..ccd5586 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -4,6 +4,7 @@
 import static com.android.launcher3.LauncherState.ALL_APPS_HEADER;
 import static com.android.launcher3.LauncherState.ALL_APPS_HEADER_EXTRA;
 import static com.android.launcher3.LauncherState.OVERVIEW;
+import static com.android.launcher3.LauncherState.VERTICAL_SWIPE_INDICATOR;
 import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_OVERVIEW_SCALE;
 import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_VERTICAL_PROGRESS;
 import static com.android.launcher3.anim.Interpolators.FAST_OUT_SLOW_IN;
@@ -198,6 +199,9 @@
         setter.setViewAlpha(mAppsView.getContentView(), hasContent ? 1 : 0, LINEAR);
         setter.setViewAlpha(mAppsView.getScrollBar(), hasContent ? 1 : 0, LINEAR);
         mAppsView.getFloatingHeaderView().setContentVisibility(hasHeaderExtra, hasContent, setter);
+
+        setter.setInt(mScrimView, ScrimView.DRAG_HANDLE_ALPHA,
+                (visibleElements & VERTICAL_SWIPE_INDICATOR) != 0 ? 255 : 0, LINEAR);
     }
 
     public AnimatorListenerAdapter getProgressAnimatorListener() {
diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
index 6bbce00..d01da43 100644
--- a/src/com/android/launcher3/views/ScrimView.java
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -45,6 +45,7 @@
 import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat.AccessibilityActionCompat;
 import android.support.v4.widget.ExploreByTouchHelper;
 import android.util.AttributeSet;
+import android.util.Property;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
@@ -73,6 +74,19 @@
 public class ScrimView extends View implements Insettable, OnChangeListener,
         AccessibilityStateChangeListener, StateListener {
 
+    public static final Property<ScrimView, Integer> DRAG_HANDLE_ALPHA =
+            new Property<ScrimView, Integer>(Integer.TYPE, "dragHandleAlpha") {
+
+                @Override
+                public Integer get(ScrimView scrimView) {
+                    return scrimView.mDragHandleAlpha;
+                }
+
+                @Override
+                public void set(ScrimView scrimView, Integer value) {
+                    scrimView.setDragHandleAlpha(value);
+                }
+            };
     private static final int WALLPAPERS = R.string.wallpaper_button_text;
     private static final int WIDGETS = R.string.widget_button_text;
     private static final int SETTINGS = R.string.settings_button_text;
@@ -102,6 +116,8 @@
     @Nullable
     protected Drawable mDragHandle;
 
+    private int mDragHandleAlpha = 255;
+
     public ScrimView(Context context, AttributeSet attrs) {
         super(context, attrs);
         mLauncher = Launcher.getLauncher(context);
@@ -187,7 +203,17 @@
 
     protected void updateDragHandleAlpha() {
         if (mDragHandle != null) {
-            mDragHandle.setAlpha(Math.round(255 * Utilities.boundToRange(mProgress, 0, 1)));
+            mDragHandle.setAlpha(mDragHandleAlpha);
+        }
+    }
+
+    private void setDragHandleAlpha(int alpha) {
+        if (alpha != mDragHandleAlpha) {
+            mDragHandleAlpha = alpha;
+            if (mDragHandle != null) {
+                mDragHandle.setAlpha(mDragHandleAlpha);
+                invalidate();
+            }
         }
     }