Change page snapping logic for large screen devices

Use 15% of the screen width instead of 40% of the page
width currently used for phones.

Test: try page snapping on Launcher home
Bug: 213305066
Change-Id: I6a525100bf942c5089f580a27250c425ca95cf00

quickstep/src/com/android/quickstep/views/RecentsView.java

@@ -383,7 +383,7 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
     private static final float ANIMATION_DISMISS_PROGRESS_MIDPOINT = 0.5f;
     private static final float END_DISMISS_TRANSLATION_INTERPOLATION_OFFSET = 0.75f;
 
-    private static final float SIGNIFICANT_MOVE_THRESHOLD_TABLET = 0.15f;
+    private static final float SIGNIFICANT_MOVE_SCREEN_WIDTH_PERCENTAGE = 0.15f;
 
     protected final RecentsOrientedState mOrientationState;
     protected final BaseActivityInterface<STATE_TYPE, ACTIVITY_TYPE> mSizeStrategy;
@@ -1195,9 +1195,14 @@ public abstract class RecentsView<ACTIVITY_TYPE extends StatefulActivity<STATE_T
     }
 
     @Override
-    protected float getSignificantMoveThreshold() {
-        return mActivity.getDeviceProfile().isTablet ? SIGNIFICANT_MOVE_THRESHOLD_TABLET
-                : super.getSignificantMoveThreshold();
+    protected boolean isSignificantMove(float absoluteDelta, int pageOrientedSize) {
+        DeviceProfile deviceProfile = mActivity.getDeviceProfile();
+        if (!deviceProfile.isTablet) {
+            return super.isSignificantMove(absoluteDelta, pageOrientedSize);
+        }
+
+        return absoluteDelta
+                > deviceProfile.availableWidthPx * SIGNIFICANT_MOVE_SCREEN_WIDTH_PERCENTAGE;
     }
 
     @Override

src/com/android/launcher3/PagedView.java

@@ -1195,8 +1195,8 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
         mAllowOverScroll = enable;
     }
 
-    protected float getSignificantMoveThreshold() {
-        return SIGNIFICANT_MOVE_THRESHOLD;
+    protected boolean isSignificantMove(float absoluteDelta, int pageOrientedSize) {
+        return absoluteDelta > pageOrientedSize * SIGNIFICANT_MOVE_THRESHOLD;
     }
 
     @Override
@@ -1322,13 +1322,12 @@ public abstract class PagedView<T extends View & PageIndicator> extends ViewGrou
                 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
 
                 int velocity = (int) mOrientationHandler.getPrimaryVelocity(velocityTracker,
-                    mActivePointerId);
+                        mActivePointerId);
                 float delta = primaryDirection - mDownMotionPrimary;
-                delta /= mOrientationHandler.getPrimaryScale(this);
-                int pageOrientedSize = mOrientationHandler.getMeasuredSize(getPageAt(mCurrentPage));
-
-                boolean isSignificantMove = Math.abs(delta)
-                        > pageOrientedSize * getSignificantMoveThreshold();
+                int pageOrientedSize = (int) (mOrientationHandler.getMeasuredSize(
+                        getPageAt(mCurrentPage))
+                        * mOrientationHandler.getPrimaryScale(this));
+                boolean isSignificantMove = isSignificantMove(Math.abs(delta), pageOrientedSize);
 
                 mTotalMotion += Math.abs(mLastMotion + mLastMotionRemainder - primaryDirection);
                 boolean passedSlop = mAllowEasyFling || mTotalMotion > mPageSlop;

src/com/android/launcher3/Workspace.java

@@ -149,6 +149,8 @@ public class Workspace<T extends View & PageIndicator> extends PagedView<T>
      * {@link #isFinishedSwitchingState()} ()} to return true. */
     private static final float FINISHED_SWITCHING_STATE_TRANSITION_PROGRESS = 0.5f;
 
+    private static final float SIGNIFICANT_MOVE_SCREEN_WIDTH_PERCENTAGE = 0.15f;
+
     private static final boolean ENFORCE_DRAG_EVENT_ORDER = false;
 
     private static final int ADJACENT_SCREEN_DROP_DURATION = 300;
@@ -3410,6 +3412,17 @@ public class Workspace<T extends View & PageIndicator> extends PagedView<T>
         return getContext().getString(R.string.workspace_scroll_format, currentPage, totalPages);
     }
 
+    @Override
+    protected boolean isSignificantMove(float absoluteDelta, int pageOrientedSize) {
+        DeviceProfile deviceProfile = mLauncher.getDeviceProfile();
+        if (!deviceProfile.isTablet) {
+            return super.isSignificantMove(absoluteDelta, pageOrientedSize);
+        }
+
+        return absoluteDelta
+                > deviceProfile.availableWidthPx * SIGNIFICANT_MOVE_SCREEN_WIDTH_PERCENTAGE;
+    }
+
     /**
      * Used as a workaround to ensure that the AppWidgetService receives the
      * PACKAGE_ADDED broadcast before updating widgets.