Making the page spacing fixed in spring loaded mode. (Bug 6478409)

Change-Id: I3577a1beecacb82528f0fde9439a8366a709b29c

2 files changed, 21 insertions, 7 deletions

diff --git a/src/com/android/launcher2/PagedView.java b/src/com/android/launcher2/PagedView.java
index a3080a8..fa01761 100644
--- a/src/com/android/launcher2/PagedView.java
+++ b/src/com/android/launcher2/PagedView.java
@@ -75,6 +75,8 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
     private static final int MIN_SNAP_VELOCITY = 1500;
     private static final int MIN_FLING_VELOCITY = 250;
 
+    static final int AUTOMATIC_PAGE_SPACING = -1;
+
     protected int mFlingThresholdVelocity;
     protected int mMinFlingVelocity;
     protected int mMinSnapVelocity;
@@ -450,17 +452,23 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
 
         final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
         final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
+        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
+        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
         if (widthMode != MeasureSpec.EXACTLY) {
             throw new IllegalStateException("Workspace can only be used in EXACTLY mode.");
         }
 
+        // Return early if we aren't given a proper dimension
+        if (widthSize <= 0 || heightSize <= 0) {
+            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+            return;
+        }
+
         /* Allow the height to be set as WRAP_CONTENT. This allows the particular case
          * of the All apps view on XLarge displays to not take up more space then it needs. Width
          * is still not allowed to be set as WRAP_CONTENT since many parts of the code expect
          * each page to have the same width.
          */
-        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
-        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
         int maxChildHeight = 0;
 
         final int verticalPadding = getPaddingTop() + getPaddingBottom();
@@ -507,12 +515,17 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
 
         setMeasuredDimension(widthSize, heightSize);
 
+        // We can't call getChildOffset/getRelativeChildOffset until we set the measured dimensions.
+        // We also wait until we set the measured dimensions before flushing the cache as well, to
+        // ensure that the cache is filled with good values.
+        invalidateCachedOffsets();
+
         if (childCount > 0) {
             if (DEBUG) Log.d(TAG, "getRelativeChildOffset(): " + getMeasuredWidth() + ", "
                     + getChildWidth(0));
 
             // Calculate the variable page spacing if necessary
-            if (mPageSpacing < 0) {
+            if (mPageSpacing == AUTOMATIC_PAGE_SPACING) {
                 // The gap between pages in the PagedView should be equal to the gap from the page
                 // to the edge of the screen (so it is not visible in the current screen).  To
                 // account for unequal padding on each side of the paged view, we take the maximum
@@ -524,10 +537,6 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
             }
         }
 
-        // We can't call getChildOffset/getRelativeChildOffset until we set the measured dimensions.
-        // We also wait until we set the measured dimensions before flushing the cache as well, to
-        // ensure that the cache is filled with good values.
-        invalidateCachedOffsets();
         updateScrollingIndicatorPosition();
 
         if (childCount > 0) {
diff --git a/src/com/android/launcher2/Workspace.java b/src/com/android/launcher2/Workspace.java
index 3910c45..06c37cc 100644
--- a/src/com/android/launcher2/Workspace.java
+++ b/src/com/android/launcher2/Workspace.java
@@ -199,6 +199,7 @@ public class Workspace extends SmoothPagedView
     private Point mDisplaySize = new Point();
     private boolean mIsStaticWallpaper;
     private int mWallpaperTravelWidth;
+    private int mSpringLoadedPageSpacing;
 
     // Variables relating to the creation of user folders by hovering shortcuts over shortcuts
     private static final int FOLDER_CREATION_TIMEOUT = 0;
@@ -322,6 +323,8 @@ public class Workspace extends SmoothPagedView
 
         mSpringLoadedShrinkFactor =
             res.getInteger(R.integer.config_workspaceSpringLoadShrinkPercentage) / 100.0f;
+        mSpringLoadedPageSpacing =
+                res.getDimensionPixelSize(R.dimen.workspace_spring_loaded_page_spacing);
 
         // if the value is manually specified, use that instead
         cellCountX = a.getInt(R.styleable.Workspace_cellCountX, cellCountX);
@@ -1536,6 +1539,7 @@ public class Workspace extends SmoothPagedView
 
         if (state != State.NORMAL) {
             finalScaleFactor = mSpringLoadedShrinkFactor - (stateIsSmall ? 0.1f : 0);
+            setPageSpacing(mSpringLoadedPageSpacing);
             if (oldStateIsNormal && stateIsSmall) {
                 zoomIn = false;
                 setLayoutScale(finalScaleFactor);
@@ -1545,6 +1549,7 @@ public class Workspace extends SmoothPagedView
                 setLayoutScale(finalScaleFactor);
             }
         } else {
+            setPageSpacing(PagedView.AUTOMATIC_PAGE_SPACING);
             setLayoutScale(1.0f);
         }