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Merge "Only activate FastScroller when it's needed" into klp-dev

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This commit is contained in:
Alan Viverette
2013-09-09 17:24:32 +00:00
committed by Android (Google) Code Review
parent 5b068bbbe2 b9f2722f6f
commit 23f31a1c4e
2 changed files with 63 additions and 48 deletions
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16
core/java/android/widget/AbsListView.java
View File

@@ -1250,7 +1250,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
mFastScroller.setEnabled(true);
}
recomputePadding();
resolvePadding();
if (mFastScroller != null) {
mFastScroller.updateLayout();
@@ -1312,7 +1312,11 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
* @see #setFastScrollAlwaysVisible(boolean)
*/
public boolean isFastScrollAlwaysVisible() {
return mFastScrollEnabled && mFastScrollAlwaysVisible;
if (mFastScroller == null) {
return mFastScrollEnabled && mFastScrollAlwaysVisible;
} else {
return mFastScroller.isEnabled() && mFastScroller.isAlwaysShowEnabled();
}
}
@Override
@@ -1331,7 +1335,11 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
*/
@ViewDebug.ExportedProperty
public boolean isFastScrollEnabled() {
return mFastScrollEnabled;
if (mFastScroller == null) {
return mFastScrollEnabled;
} else {
return mFastScroller.isEnabled();
}
}
@Override
@@ -1356,7 +1364,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
*/
@Override
protected boolean isVerticalScrollBarHidden() {
return mFastScrollEnabled;
return isFastScrollEnabled();
}
/**

95
core/java/android/widget/FastScroller.java
View File

@@ -152,9 +152,6 @@ class FastScroller {
/** The number of headers at the top of the view. */
private int mHeaderCount;
/** The number of items in the list. */
private int mItemCount = -1;
/** The index of the current section. */
private int mCurrentSection = -1;
@@ -324,6 +321,7 @@ class FastScroller {
getSectionsFromIndexer();
refreshDrawablePressedState();
updateLongList(listView.getChildCount(), listView.getCount());
setScrollbarPosition(mList.getVerticalScrollbarPosition());
postAutoHide();
}
@@ -343,14 +341,10 @@ class FastScroller {
* @param enabled Whether the fast scroll thumb is enabled.
*/
public void setEnabled(boolean enabled) {
mEnabled = enabled;
if (mEnabled != enabled) {
mEnabled = enabled;
if (enabled) {
if (mAlwaysShow) {
setState(STATE_VISIBLE);
}
} else {
stop();
onStateDependencyChanged();
}
}
@@ -358,19 +352,17 @@ class FastScroller {
* @return Whether the fast scroll thumb is enabled.
*/
public boolean isEnabled() {
return mEnabled;
return mEnabled && (mLongList || mAlwaysShow);
}
/**
* @param alwaysShow Whether the fast scroll thumb should always be shown
*/
public void setAlwaysShow(boolean alwaysShow) {
mAlwaysShow = alwaysShow;
if (mAlwaysShow != alwaysShow) {
mAlwaysShow = alwaysShow;
if (alwaysShow) {
setState(STATE_VISIBLE);
} else if (mState == STATE_VISIBLE) {
postAutoHide();
onStateDependencyChanged();
}
}
@@ -382,6 +374,23 @@ class FastScroller {
return mAlwaysShow;
}
/**
* Called when one of the variables affecting enabled state changes.
*/
private void onStateDependencyChanged() {
if (isEnabled()) {
if (isAlwaysShowEnabled()) {
setState(STATE_VISIBLE);
} else if (mState == STATE_VISIBLE) {
postAutoHide();
}
} else {
stop();
}
mList.resolvePadding();
}
public void setScrollBarStyle(int style) {
if (mScrollBarStyle != style) {
mScrollBarStyle = style;
@@ -439,6 +448,18 @@ class FastScroller {
final int firstVisibleItem = mList.getFirstVisiblePosition();
setThumbPos(getPosFromItemCount(firstVisibleItem, visibleItemCount, totalItemCount));
}
updateLongList(visibleItemCount, totalItemCount);
}
private void updateLongList(int visibleItemCount, int totalItemCount) {
final boolean longList = visibleItemCount > 0
&& totalItemCount / visibleItemCount >= MIN_PAGES;
if (mLongList != longList) {
mLongList = longList;
onStateDependencyChanged();
}
}
/**
@@ -795,19 +816,8 @@ class FastScroller {
mList.postDelayed(mDeferHide, FADE_TIMEOUT);
}
private boolean isLongList(int visibleItemCount, int totalItemCount) {
// Are there enough pages to require fast scroll? Recompute only if
// total count changes.
if (mItemCount != totalItemCount && visibleItemCount > 0) {
mItemCount = totalItemCount;
mLongList = mItemCount / visibleItemCount >= MIN_PAGES;
}
return mLongList;
}
public void onScroll(int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (!mEnabled || !mAlwaysShow && !isLongList(visibleItemCount, totalItemCount)) {
if (!isEnabled()) {
setState(STATE_NONE);
return;
}
@@ -1221,7 +1231,7 @@ class FastScroller {
}
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (!mEnabled) {
if (!isEnabled()) {
return false;
}
@@ -1233,14 +1243,18 @@ class FastScroller {
// need to allow the parent time to decide whether it wants
// to intercept events. If it does, we will receive a CANCEL
// event.
if (mList.isInScrollingContainer()) {
mInitialTouchY = ev.getY();
startPendingDrag();
return false;
if (!mList.isInScrollingContainer()) {
beginDrag();
return true;
}
beginDrag();
return true;
mInitialTouchY = ev.getY();
startPendingDrag();
}
break;
case MotionEvent.ACTION_MOVE:
if (!isPointInside(ev.getX(), ev.getY())) {
cancelPendingDrag();
}
break;
case MotionEvent.ACTION_UP:
@@ -1253,7 +1267,7 @@ class FastScroller {
}
public boolean onInterceptHoverEvent(MotionEvent ev) {
if (!mEnabled) {
if (!isEnabled()) {
return false;
}
@@ -1269,18 +1283,11 @@ class FastScroller {
}
public boolean onTouchEvent(MotionEvent me) {
if (!mEnabled) {
if (!isEnabled()) {
return false;
}
switch (me.getActionMasked()) {
case MotionEvent.ACTION_DOWN: {
if (isPointInside(me.getX(), me.getY())) {
beginDrag();
return true;
}
} break;
case MotionEvent.ACTION_UP: {
if (mHasPendingDrag) {
// Allow a tap to scroll.