Saving/restoring current page in AppsCustomize. (5050168)
Change-Id: Ib868033a2b71383abc4569082675f391d3e4cc76
diff --git a/src/com/android/launcher2/AppsCustomizePagedView.java b/src/com/android/launcher2/AppsCustomizePagedView.java
index 9d03995..76be116 100644
--- a/src/com/android/launcher2/AppsCustomizePagedView.java
+++ b/src/com/android/launcher2/AppsCustomizePagedView.java
@@ -164,6 +164,10 @@
private final LayoutInflater mLayoutInflater;
private final PackageManager mPackageManager;
+ // Save and Restore
+ private int mSaveInstanceStateItemIndex = -1;
+ private int mRestorePage = -1;
+
// Content
private ContentType mContentType;
private ArrayList<ApplicationInfo> mApps;
@@ -252,6 +256,58 @@
}
}
+ /** Returns the item index of the center item on this page so that we can restore to this
+ * item index when we rotate. */
+ private int getMiddleComponentIndexOnCurrentPage() {
+ int i = -1;
+ if (getPageCount() > 0) {
+ int currentPage = getCurrentPage();
+ switch (mContentType) {
+ case Applications: {
+ PagedViewCellLayout layout = (PagedViewCellLayout) getChildAt(currentPage);
+ PagedViewCellLayoutChildren childrenLayout = layout.getChildrenLayout();
+ int numItemsPerPage = mCellCountX * mCellCountY;
+ int childCount = childrenLayout.getChildCount();
+ if (childCount > 0) {
+ i = (currentPage * numItemsPerPage) + (childCount / 2);
+ }}
+ break;
+ case Widgets: {
+ PagedViewGridLayout layout = (PagedViewGridLayout) getChildAt(currentPage);
+ int numItemsPerPage = mWidgetCountX * mWidgetCountY;
+ int childCount = layout.getChildCount();
+ if (childCount > 0) {
+ i = (currentPage * numItemsPerPage) + (childCount / 2);
+ }}
+ break;
+ }
+ }
+ return i;
+ }
+
+ /** Get the index of the item to restore to if we need to restore the current page. */
+ int getSaveInstanceStateIndex() {
+ if (mSaveInstanceStateItemIndex == -1) {
+ mSaveInstanceStateItemIndex = getMiddleComponentIndexOnCurrentPage();
+ }
+ return mSaveInstanceStateItemIndex;
+ }
+
+ /** Returns the page in the current orientation which is expected to contain the specified
+ * item index. */
+ int getPageForComponent(int index) {
+ switch (mContentType) {
+ case Applications: {
+ int numItemsPerPage = mCellCountX * mCellCountY;
+ return (index / numItemsPerPage);
+ }
+ case Widgets: {
+ int numItemsPerPage = mWidgetCountX * mWidgetCountY;
+ return (index / numItemsPerPage);
+ }}
+ return -1;
+ }
+
/**
* This differs from isDataReady as this is the test done if isDataReady is not set.
*/
@@ -261,6 +317,20 @@
return !mApps.isEmpty();
}
+ /** Restores the page for an item at the specified index */
+ void restorePageForIndex(int index) {
+ if (index < 0) return;
+
+ int page = getPageForComponent(index);
+ if (page > -1) {
+ if (getChildCount() > 0) {
+ invalidatePageData(page);
+ } else {
+ mRestorePage = page;
+ }
+ }
+ }
+
protected void onDataReady(int width, int height) {
// Note that we transpose the counts in portrait so that we get a similar layout
boolean isLandscape = getResources().getConfiguration().orientation ==
@@ -288,7 +358,8 @@
int heightSpec = MeasureSpec.makeMeasureSpec(getMeasuredHeight(), MeasureSpec.AT_MOST);
mWidgetSpacingLayout.measure(widthSpec, heightSpec);
mContentWidth = mWidgetSpacingLayout.getContentWidth();
- invalidatePageData();
+ invalidatePageData(Math.max(0, mRestorePage));
+ mRestorePage = -1;
}
@Override
@@ -1036,6 +1107,10 @@
setChildrenDrawnWithCacheEnabled(false);
*/
super.onPageEndMoving();
+
+ // We reset the save index when we change pages so that it will be recalculated on next
+ // rotation
+ mSaveInstanceStateItemIndex = -1;
}
/*