/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.huewu.pla.lib.internal;
import java.util.ArrayList;
import com.youxiachai.onexlistview.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewDebug;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import android.widget.ListAdapter;
import android.widget.WrapperListAdapter;
/*
* Implementation Notes:
*
* Some terminology:
*
* index - index of the items that are currently visible
* position - index of the items in the cursor
*/
/**
* A view that shows items in a vertically scrolling list. The items
* come from the {@link ListAdapter} associated with this view.
*
* <p>See the <a href="{@docRoot}resources/tutorials/views/hello-listview.html">List View
* tutorial</a>.</p>
*
* @attr ref android.R.styleable#ListView_entries
* @attr ref android.R.styleable#ListView_divider
* @attr ref android.R.styleable#ListView_dividerHeight
* @attr ref android.R.styleable#ListView_choiceMode
* @attr ref android.R.styleable#ListView_headerDividersEnabled
* @attr ref android.R.styleable#ListView_footerDividersEnabled
*/
public class PLA_ListView extends PLA_AbsListView {
//TODO Not Supproted Features
//Entry from XML.
//Choice Mode & Item Selection.
//Filter
//Handle Key Event & Arrow Scrolling..
//Can't find Footer & Header findBy methods...
/**
* Used to indicate a no preference for a position type.
*/
static final int NO_POSITION = -1;
/**
* When arrow scrolling, ListView will never scroll more than this factor
* times the height of the list.
*/
private static final float MAX_SCROLL_FACTOR = 0.33f;
/**
* A class that represents a fixed view in a list, for example a header at the top
* or a footer at the bottom.
*/
public class FixedViewInfo {
/** The view to add to the list */
public View view;
/** The data backing the view. This is returned from {@link ListAdapter#getItem(int)}. */
public Object data;
/** <code>true</code> if the fixed view should be selectable in the list */
public boolean isSelectable;
}
private ArrayList<FixedViewInfo> mHeaderViewInfos = new ArrayList<PLA_ListView.FixedViewInfo>();
private ArrayList<FixedViewInfo> mFooterViewInfos = new ArrayList<PLA_ListView.FixedViewInfo>();
Drawable mDivider;
int mDividerHeight;
Drawable mOverScrollHeader;
Drawable mOverScrollFooter;
private boolean mIsCacheColorOpaque;
private boolean mDividerIsOpaque;
private boolean mClipDivider;
private boolean mHeaderDividersEnabled;
private boolean mFooterDividersEnabled;
private boolean mAreAllItemsSelectable = true;
private boolean mItemsCanFocus = false;
// used for temporary calculations.
private final Rect mTempRect = new Rect();
private Paint mDividerPaint;
public PLA_ListView(Context context) {
this(context, null);
}
public PLA_ListView(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.listViewStyle);
}
public PLA_ListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.ListView, defStyle, 0);
// final Drawable d = a.getDrawable(android.R.drawable.divider_horizontal_bright);
// if (d != null) {
// // If a divider is specified use its intrinsic height for divider height
// setDivider(d);
// }
final Drawable osHeader = a.getDrawable(
R.styleable.ListView_overScrollHeader);
if (osHeader != null) {
setOverscrollHeader(osHeader);
}
final Drawable osFooter = a.getDrawable(
R.styleable.ListView_overScrollFooter);
if (osFooter != null) {
setOverscrollFooter(osFooter);
}
// Use the height specified, zero being the default
final int dividerHeight = a.getDimensionPixelSize(
R.styleable.ListView_dividerHeight, 0);
if (dividerHeight != 0) {
setDividerHeight(dividerHeight);
}
mHeaderDividersEnabled = a.getBoolean(R.styleable.ListView_headerDividersEnabled, true);
mFooterDividersEnabled = a.getBoolean(R.styleable.ListView_footerDividersEnabled, true);
a.recycle();
}
/**
* @return The maximum amount a list view will scroll in response to
* an arrow event.
*/
public int getMaxScrollAmount() {
// return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop));
return (int) (MAX_SCROLL_FACTOR * (getBottom() - getTop()));
}
/**
* Make sure views are touching the top or bottom edge, as appropriate for
* our gravity
*/
private void adjustViewsUpOrDown() {
final int childCount = getChildCount();
int delta;
if (childCount > 0) {
//View child;
if (!mStackFromBottom) {
// Uh-oh -- we came up short. Slide all views up to make them
// align with the top
final int firstTop = getScrollChildTop();
//child = getChildAt(0);
//delta = child.getTop() - mListPadding.top;
delta = firstTop - mListPadding.top;
if (mFirstPosition != 0) {
// It's OK to have some space above the first item if it is
// part of the vertical spacing
delta -= mDividerHeight;
}
if (delta < 0) {
// We only are looking to see if we are too low, not too high
delta = 0;
}
} else {
// we are too high, slide all views down to align with bottom
//child = getChildAt(childCount - 1);
//delta = child.getBottom() - (getHeight() - mListPadding.bottom);
final int lastBottom = getScrollChildBottom();
delta = lastBottom - (getHeight() - mListPadding.bottom);
if (mFirstPosition + childCount < mItemCount) {
// It's OK to have some space below the last item if it is
// part of the vertical spacing
delta += mDividerHeight;
}
if (delta > 0) {
delta = 0;
}
}
if (delta != 0) {
//offsetChildrenTopAndBottom(-delta);
tryOffsetChildrenTopAndBottom(-delta);
}
}
}
/**
* Add a fixed view to appear at the top of the list. If addHeaderView is
* called more than once, the views will appear in the order they were
* added. Views added using this call can take focus if they want.
* <p>
* NOTE: Call this before calling setAdapter. This is so ListView can wrap
* the supplied cursor with one that will also account for header and footer
* views.
*
* @param v The view to add.
* @param data Data to associate with this view
* @param isSelectable whether the item is selectable
*/
public void addHeaderView(View v, Object data, boolean isSelectable) {
if (mAdapter != null) {
throw new IllegalStateException(
"Cannot add header view to list -- setAdapter has already been called.");
}
FixedViewInfo info = new FixedViewInfo();
info.view = v;
info.data = data;
info.isSelectable = isSelectable;
mHeaderViewInfos.add(info);
}
/**
* Add a fixed view to appear at the top of the list. If addHeaderView is
* called more than once, the views will appear in the order they were
* added. Views added using this call can take focus if they want.
* <p>
* NOTE: Call this before calling setAdapter. This is so ListView can wrap
* the supplied cursor with one that will also account for header and footer
* views.
*
* @param v The view to add.
*/
public void addHeaderView(View v) {
addHeaderView(v, null, true);
}
@Override
public int getHeaderViewsCount() {
return mHeaderViewInfos.size();
}
/**
* check this view is fixed view(ex>Header & Footer) or not.
* @param v
* @return true if this is fixed view.
*/
public boolean isFixedView( View v ) {
{
//check header view.
ArrayList<FixedViewInfo> where = mHeaderViewInfos;
int len = where.size();
for (int i = 0; i < len; ++i) {
FixedViewInfo info = where.get(i);
if (info.view == v) {
return true;
}
}
}
{
//check footer view.
ArrayList<FixedViewInfo> where = mFooterViewInfos;
int len = where.size();
for (int i = 0; i < len; ++i) {
FixedViewInfo info = where.get(i);
if (info.view == v) {
return true;
}
}
}
return false;
}
/**
* Removes a previously-added header view.
*
* @param v The view to remove
* @return true if the view was removed, false if the view was not a header
* view
*/
public boolean removeHeaderView(View v) {
if (mHeaderViewInfos.size() > 0) {
boolean result = false;
if (((PLA_HeaderViewListAdapter) mAdapter).removeHeader(v)) {
mDataSetObserver.onChanged();
result = true;
}
removeFixedViewInfo(v, mHeaderViewInfos);
return result;
}
return false;
}
private void removeFixedViewInfo(View v, ArrayList<FixedViewInfo> where) {
int len = where.size();
for (int i = 0; i < len; ++i) {
FixedViewInfo info = where.get(i);
if (info.view == v) {
where.remove(i);
break;
}
}
}
/**
* Add a fixed view to appear at the bottom of the list. If addFooterView is
* called more than once, the views will appear in the order they were
* added. Views added using this call can take focus if they want.
* <p>
* NOTE: Call this before calling setAdapter. This is so ListView can wrap
* the supplied cursor with one that will also account for header and footer
* views.
*
* @param v The view to add.
* @param data Data to associate with this view
* @param isSelectable true if the footer view can be selected
*/
public void addFooterView(View v, Object data, boolean isSelectable) {
FixedViewInfo info = new FixedViewInfo();
info.view = v;
info.data = data;
info.isSelectable = isSelectable;
mFooterViewInfos.add(info);
// in the case of re-adding a footer view, or adding one later on,
// we need to notify the observer
if (mDataSetObserver != null) {
mDataSetObserver.onChanged();
}
}
/**
* Add a fixed view to appear at the bottom of the list. If addFooterView is called more
* than once, the views will appear in the order they were added. Views added using
* this call can take focus if they want.
* <p>NOTE: Call this before calling setAdapter. This is so ListView can wrap the supplied
* cursor with one that will also account for header and footer views.
*
*
* @param v The view to add.
*/
public void addFooterView(View v) {
addFooterView(v, null, true);
}
@Override
public int getFooterViewsCount() {
return mFooterViewInfos.size();
}
/**
* Removes a previously-added footer view.
*
* @param v The view to remove
* @return
* true if the view was removed, false if the view was not a footer view
*/
public boolean removeFooterView(View v) {
if (mFooterViewInfos.size() > 0) {
boolean result = false;
if (((PLA_HeaderViewListAdapter) mAdapter).removeFooter(v)) {
mDataSetObserver.onChanged();
result = true;
}
removeFixedViewInfo(v, mFooterViewInfos);
return result;
}
return false;
}
/**
* Returns the adapter currently in use in this ListView. The returned adapter
* might not be the same adapter passed to {@link #setAdapter(ListAdapter)} but
* might be a {@link WrapperListAdapter}.
*
* @return The adapter currently used to display data in this ListView.
*
* @see #setAdapter(ListAdapter)
*/
@Override
public ListAdapter getAdapter() {
return mAdapter;
}
/**
* Sets the data behind this ListView.
*
* The adapter passed to this method may be wrapped by a {@link WrapperListAdapter},
* depending on the ListView features currently in use. For instance, adding
* headers and/or footers will cause the adapter to be wrapped.
*
* @param adapter The ListAdapter which is responsible for maintaining the
* data backing this list and for producing a view to represent an
* item in that data set.
*
* @see #getAdapter()
*/
@Override
public void setAdapter(ListAdapter adapter) {
if (null != mAdapter) {
mAdapter.unregisterDataSetObserver(mDataSetObserver);
}
resetList();
mRecycler.clear();
if (mHeaderViewInfos.size() > 0|| mFooterViewInfos.size() > 0) {
mAdapter = new PLA_HeaderViewListAdapter(mHeaderViewInfos, mFooterViewInfos, adapter);
} else {
mAdapter = adapter;
}
mOldSelectedPosition = INVALID_POSITION;
mOldSelectedRowId = INVALID_ROW_ID;
if (mAdapter != null) {
mAreAllItemsSelectable = mAdapter.areAllItemsEnabled();
mOldItemCount = mItemCount;
mItemCount = mAdapter.getCount();
checkFocus();
mDataSetObserver = new AdapterDataSetObserver();
mAdapter.registerDataSetObserver(mDataSetObserver);
mRecycler.setViewTypeCount(mAdapter.getViewTypeCount());
} else {
mAreAllItemsSelectable = true;
checkFocus();
// Nothing selected
}
requestLayout();
}
@Override
public int getFirstVisiblePosition() {
return Math.max( 0, mFirstPosition - getHeaderViewsCount());
}
@Override
public int getLastVisiblePosition() {
return Math.min( mFirstPosition + getChildCount() - 1, mAdapter.getCount() - 1);
}
/**
* The list is empty. Clear everything out.
*/
@Override
void resetList() {
// The parent's resetList() will remove all views from the layout so we need to
// cleanup the state of our footers and headers
clearRecycledState(mHeaderViewInfos);
clearRecycledState(mFooterViewInfos);
super.resetList();
mLayoutMode = LAYOUT_NORMAL;
}
private void clearRecycledState(ArrayList<FixedViewInfo> infos) {
if (infos != null) {
final int count = infos.size();
for (int i = 0; i < count; i++) {
final View child = infos.get(i).view;
final LayoutParams p = (LayoutParams) child.getLayoutParams();
if (p != null) {
p.recycledHeaderFooter = false;
}
}
}
}
/**
* @return Whether the list needs to show the top fading edge
*/
private boolean showingTopFadingEdge() {
// final int listTop = mScrollY + mListPadding.top;
final int listTop = getScrollY() + mListPadding.top;
return (mFirstPosition > 0) || (getChildAt(0).getTop() > listTop);
}
/**
* @return Whether the list needs to show the bottom fading edge
*/
private boolean showingBottomFadingEdge() {
final int childCount = getChildCount();
final int bottomOfBottomChild = getChildAt(childCount - 1).getBottom();
final int lastVisiblePosition = mFirstPosition + childCount - 1;
// final int listBottom = mScrollY + getHeight() - mListPadding.bottom;
final int listBottom = getScrollY() + getHeight() - mListPadding.bottom;
return (lastVisiblePosition < mItemCount - 1)
|| (bottomOfBottomChild < listBottom);
}
@Override
public boolean requestChildRectangleOnScreen(View child, Rect rect, boolean immediate) {
int rectTopWithinChild = rect.top;
// offset so rect is in coordinates of the this view
rect.offset(child.getLeft(), child.getTop());
rect.offset(-child.getScrollX(), -child.getScrollY());
final int height = getHeight();
int listUnfadedTop = getScrollY();
int listUnfadedBottom = listUnfadedTop + height;
final int fadingEdge = getVerticalFadingEdgeLength();
if (showingTopFadingEdge()) {
// leave room for top fading edge as long as rect isn't at very top
if (rectTopWithinChild > fadingEdge) {
listUnfadedTop += fadingEdge;
}
}
int childCount = getChildCount();
int bottomOfBottomChild = getChildAt(childCount - 1).getBottom();
if (showingBottomFadingEdge()) {
// leave room for bottom fading edge as long as rect isn't at very bottom
if (rect.bottom < (bottomOfBottomChild - fadingEdge)) {
listUnfadedBottom -= fadingEdge;
}
}
int scrollYDelta = 0;
if (rect.bottom > listUnfadedBottom && rect.top > listUnfadedTop) {
// need to MOVE DOWN to get it in view: move down just enough so
// that the entire rectangle is in view (or at least the first
// screen size chunk).
if (rect.height() > height) {
// just enough to get screen size chunk on
scrollYDelta += (rect.top - listUnfadedTop);
} else {
// get entire rect at bottom of screen
scrollYDelta += (rect.bottom - listUnfadedBottom);
}
// make sure we aren't scrolling beyond the end of our children
int distanceToBottom = bottomOfBottomChild - listUnfadedBottom;
scrollYDelta = Math.min(scrollYDelta, distanceToBottom);
} else if (rect.top < listUnfadedTop && rect.bottom < listUnfadedBottom) {
// need to MOVE UP to get it in view: move up just enough so that
// entire rectangle is in view (or at least the first screen
// size chunk of it).
if (rect.height() > height) {
// screen size chunk
scrollYDelta -= (listUnfadedBottom - rect.bottom);
} else {
// entire rect at top
scrollYDelta -= (listUnfadedTop - rect.top);
}
// make sure we aren't scrolling any further than the top our children
int top = getChildAt(0).getTop();
int deltaToTop = top - listUnfadedTop;
scrollYDelta = Math.max(scrollYDelta, deltaToTop);
}
final boolean scroll = scrollYDelta != 0;
if (scroll) {
scrollListItemsBy(-scrollYDelta);
positionSelector(child);
mSelectedTop = child.getTop();
invalidate();
}
return scroll;
}
/**
* override this method to manipulate the position of each item in list view.
* return item left position.
* @param pos
* @return pos's item left position.
*/
protected int getItemLeft(int pos) {
return mListPadding.left;
}
/**
* override this method to manipulate the position of each item in list view.
* return item's top position. (item will be added in down direction)
* @param pos
* @return value of pos's item top.
*/
protected int getItemTop(int pos) {
//just return the last itme's bottom position..
int count = getChildCount();
return count > 0 ? getChildAt(count - 1).getBottom() + mDividerHeight : getListPaddingTop();
}
/**
* override this method to manipulate the position of each item in list view.
* return item's bottom position. (item will be added in up direction)
* @param pos
* @return value of pos's item bottom.
*/
protected int getItemBottom(int pos) {
int count = getChildCount();
return count > 0 ? getChildAt(0).getTop() - mDividerHeight : getHeight() - getListPaddingBottom();
}
/**
* {@inheritDoc}
*/
@Override
protected void fillGap(boolean down) {
final int count = getChildCount();
if (down) {
fillDown(mFirstPosition + count, getItemTop(mFirstPosition + count));
onAdjustChildViews( down );
} else {
fillUp(mFirstPosition - 1, getItemBottom(mFirstPosition - 1));
onAdjustChildViews( down );
}
}
/**
* Fills the list from pos down to the end of the list view.
*
* @param pos The first position to put in the list
*
* @param nextTop The location where the top of the item associated with pos
* should be drawn
*
* @return The view that is currently selected, if it happens to be in the
* range that we draw.
*/
private View fillDown(int pos, int top) {
//int end = (mBottom - mTop) - mListPadding.bottom;
int end = (getBottom() - getTop()) - mListPadding.bottom;
int childTop = getFillChildBottom() + mDividerHeight;
while (childTop < end && pos < mItemCount) {
// is this the selected item?
makeAndAddView(pos, getItemTop(pos), true, false);
pos++;
childTop = getFillChildBottom() + mDividerHeight;
}
return null;
}
/**
* Fills the list from pos up to the top of the list view.
*
* @param pos The first position to put in the list
*
* @param nextBottom The location where the bottom of the item associated
* with pos should be drawn
*
* @return The view that is currently selected
*/
private View fillUp(int pos, int bottom) {
int end = mListPadding.top;
int childBottom = getFillChildTop();
while (childBottom > end && pos >= 0) {
// is this the selected item?
makeAndAddView(pos, getItemBottom(pos), false, false);
// nextBottom = child.getTop() - mDividerHeight;
pos--;
childBottom = getItemBottom(pos);
}
mFirstPosition = pos + 1;
return null;
}
/**
* Fills the list from top to bottom, starting with mFirstPosition
*
* @param nextTop The location where the top of the first item should be
* drawn
*
* @return The view that is currently selected
*/
private View fillFromTop(int nextTop) {
mFirstPosition = Math.min(mFirstPosition, -1);
mFirstPosition = Math.min(mFirstPosition, mItemCount - 1);
if (mFirstPosition < 0) {
mFirstPosition = 0;
}
return fillDown(mFirstPosition, nextTop);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Sets up mListPadding
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int childWidth = 0;
int childHeight = 0;
mItemCount = mAdapter == null ? 0 : mAdapter.getCount();
if (mItemCount > 0 && (widthMode == MeasureSpec.UNSPECIFIED ||
heightMode == MeasureSpec.UNSPECIFIED)) {
final View child = obtainView(0, mIsScrap);
measureScrapChild(child, 0, widthMeasureSpec);
childWidth = child.getMeasuredWidth();
childHeight = child.getMeasuredHeight();
if (recycleOnMeasure() && mRecycler.shouldRecycleViewType(
((LayoutParams) child.getLayoutParams()).viewType)) {
mRecycler.addScrapView(child);
}
}
if (widthMode == MeasureSpec.UNSPECIFIED) {
widthSize = mListPadding.left + mListPadding.right + childWidth +
getVerticalScrollbarWidth();
}
if (heightMode == MeasureSpec.UNSPECIFIED) {
heightSize = mListPadding.top + mListPadding.bottom + childHeight +
getVerticalFadingEdgeLength() * 2;
}
if (heightMode == MeasureSpec.AT_MOST) {
// TODO: after first layout we should maybe start at the first visible position, not 0
heightSize = measureHeightOfChildren(widthMeasureSpec, 0, NO_POSITION, heightSize, -1);
}
setMeasuredDimension(widthSize, heightSize);
mWidthMeasureSpec = widthMeasureSpec;
}
private void measureScrapChild(View child, int position, int widthMeasureSpec) {
LayoutParams p = (LayoutParams) child.getLayoutParams();
if (p == null) {
p = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 0);
child.setLayoutParams(p);
}
p.viewType = mAdapter.getItemViewType(position);
p.forceAdd = true;
int childWidthSpec = ViewGroup.getChildMeasureSpec(widthMeasureSpec,
mListPadding.left + mListPadding.right, p.width);
int lpHeight = p.height;
int childHeightSpec;
if (lpHeight > 0) {
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
}
child.measure(childWidthSpec, childHeightSpec);
}
/**
* @return True to recycle the views used to measure this ListView in
* UNSPECIFIED/AT_MOST modes, false otherwise.
* @hide
*/
protected boolean recycleOnMeasure() {
return true;
}
/**
* Measures the height of the given range of children (inclusive) and
* returns the height with this ListView's padding and divider heights
* included. If maxHeight is provided, the measuring will stop when the
* current height reaches maxHeight.
*
* @param widthMeasureSpec The width measure spec to be given to a child's
* {@link View#measure(int, int)}.
* @param startPosition The position of the first child to be shown.
* @param endPosition The (inclusive) position of the last child to be
* shown. Specify {@link #NO_POSITION} if the last child should be
* the last available child from the adapter.
* @param maxHeight The maximum height that will be returned (if all the
* children don't fit in this value, this value will be
* returned).
* @param disallowPartialChildPosition In general, whether the returned
* height should only contain entire children. This is more
* powerful--it is the first inclusive position at which partial
* children will not be allowed. Example: it looks nice to have
* at least 3 completely visible children, and in portrait this
* will most likely fit; but in landscape there could be times
* when even 2 children can not be completely shown, so a value
* of 2 (remember, inclusive) would be good (assuming
* startPosition is 0).
* @return The height of this ListView with the given children.
*/
final int measureHeightOfChildren(int widthMeasureSpec, int startPosition, int endPosition,
final int maxHeight, int disallowPartialChildPosition) {
final ListAdapter adapter = mAdapter;
if (adapter == null) {
return mListPadding.top + mListPadding.bottom;
}
// Include the padding of the list
int returnedHeight = mListPadding.top + mListPadding.bottom;
final int dividerHeight = ((mDividerHeight > 0) && mDivider != null) ? mDividerHeight : 0;
// The previous height value that was less than maxHeight and contained
// no partial children
int prevHeightWithoutPartialChild = 0;
int i;
View child;
// mItemCount - 1 since endPosition parameter is inclusive
endPosition = (endPosition == NO_POSITION) ? adapter.getCount() - 1 : endPosition;
final PLA_AbsListView.RecycleBin recycleBin = mRecycler;
final boolean recyle = recycleOnMeasure();
final boolean[] isScrap = mIsScrap;
for (i = startPosition; i <= endPosition; ++i) {
child = obtainView(i, isScrap);
measureScrapChild(child, i, widthMeasureSpec);
if (i > 0) {
// Count the divider for all but one child
returnedHeight += dividerHeight;
}
// Recycle the view before we possibly return from the method
if (recyle && recycleBin.shouldRecycleViewType(
((LayoutParams) child.getLayoutParams()).viewType)) {
recycleBin.addScrapView(child);
}
returnedHeight += child.getMeasuredHeight();
if (returnedHeight >= maxHeight) {
// We went over, figure out which height to return. If returnedHeight > maxHeight,
// then the i'th position did not fit completely.
return (disallowPartialChildPosition >= 0) // Disallowing is enabled (> -1)
&& (i > disallowPartialChildPosition) // We've past the min pos
&& (prevHeightWithoutPartialChild > 0) // We have a prev height
&& (returnedHeight != maxHeight) // i'th child did not fit completely
? prevHeightWithoutPartialChild
: maxHeight;
}
if ((disallowPartialChildPosition >= 0) && (i >= disallowPartialChildPosition)) {
prevHeightWithoutPartialChild = returnedHeight;
}
}
// At this point, we went through the range of children, and they each
// completely fit, so return the returnedHeight
return returnedHeight;
}
@Override
int findMotionRow(int y) {
int childCount = getChildCount();
if (childCount > 0) {
if (!mStackFromBottom) {
for (int i = 0; i < childCount; i++) {
View v = getChildAt(i);
if (y <= v.getBottom()) {
return mFirstPosition + i;
}
}
} else {
for (int i = childCount - 1; i >= 0; i--) {
View v = getChildAt(i);
if (y >= v.getTop()) {
return mFirstPosition + i;
}
}
}
}
return INVALID_POSITION;
}
/**
* Put a specific item at a specific location on the screen and then build
* up and down from there.
*
* @param position The reference view to use as the starting point
* @param top Pixel offset from the top of this view to the top of the
* reference view.
*
* @return The selected view, or null if the selected view is outside the
* visible area.
*/
private View fillSpecific(int position, int top) {
if(DEBUG) Log.d("PLA_ListView", "FillSpecific: " + position + ":" + top);
View temp = makeAndAddView(position, top, true, false);
// Possibly changed again in fillUp if we add rows above this one.
mFirstPosition = position;
final int dividerHeight = mDividerHeight;
if (!mStackFromBottom) {
fillUp(position - 1, temp.getTop() - dividerHeight);
// This will correct for the top of the first view not touching the top of the list
adjustViewsUpOrDown();
fillDown(position + 1, temp.getBottom() + dividerHeight);
int childCount = getChildCount();
if (childCount > 0) {
correctTooHigh(childCount);
}
} else {
fillDown(position + 1, temp.getBottom() + dividerHeight);
// This will correct for the bottom of the last view not touching the bottom of the list
adjustViewsUpOrDown();
fillUp(position - 1, temp.getTop() - dividerHeight);
int childCount = getChildCount();
if (childCount > 0) {
correctTooLow(childCount);
}
}
return null;
}
/**
* Check if we have dragged the bottom of the list too high (we have pushed the
* top element off the top of the screen when we did not need to). Correct by sliding
* everything back down.
*
* @param childCount Number of children
*/
private void correctTooHigh(int childCount) {
// First see if the last item is visible. If it is not, it is OK for the
// top of the list to be pushed up.
int lastPosition = mFirstPosition + childCount - 1;
if (lastPosition == mItemCount - 1 && childCount > 0) {
// Get the last child ...
//final View lastChild = getChildAt(childCount - 1);
// ... and its bottom edge
//final int lastBottom = lastChild.getBottom();
final int lastBottom = getScrollChildBottom();
// This is bottom of our drawable area
// final int end = (mBottom - mTop) - mListPadding.bottom;
final int end = (getBottom() - getTop()) - mListPadding.bottom;
// This is how far the bottom edge of the last view is from the bottom of the drawable area
int bottomOffset = end - lastBottom;
//View firstChild = getChildAt(0);
//final int firstTop = firstChild.getTop();
final int firstTop = getScrollChildTop();
// Make sure we are 1) Too high, and 2) Either there are more rows above the
// first row or the first row is scrolled off the top of the drawable area
if (bottomOffset > 0 && (mFirstPosition > 0 || firstTop < mListPadding.top)) {
if (mFirstPosition == 0) {
// Don't pull the top too far down
bottomOffset = Math.min(bottomOffset, mListPadding.top - firstTop);
}
// Move everything down
// offsetChildrenTopAndBottom(bottomOffset);
tryOffsetChildrenTopAndBottom(bottomOffset);
if (mFirstPosition > 0) {
// Fill the gap that was opened above mFirstPosition with more rows, if
// possible
int newFirstTop = getScrollChildTop();
fillUp(mFirstPosition - 1, newFirstTop - mDividerHeight);
// Close up the remaining gap
adjustViewsUpOrDown();
}
}
}
}
/**
* Check if we have dragged the bottom of the list too low (we have pushed the
* bottom element off the bottom of the screen when we did not need to). Correct by sliding
* everything back up.
*
* @param childCount Number of children
*/
private void correctTooLow(int childCount) {
// First see if the first item is visible. If it is not, it is OK for the
// bottom of the list to be pushed down.
if (mFirstPosition == 0 && childCount > 0) {
// Get the first child and its top edge
final int firstTop = getScrollChildTop();
// This is top of our drawable area
final int start = mListPadding.top;
// This is bottom of our drawable area
final int end = (getBottom() -getTop()) - mListPadding.bottom;
// This is how far the top edge of the first view is from the top of the drawable area
int topOffset = firstTop - start;
final int lastBottom = getScrollChildBottom();
int lastPosition = mFirstPosition + childCount - 1;
// Make sure we are 1) Too low, and 2) Either there are more rows below the
// last row or the last row is scrolled off the bottom of the drawable area
if (topOffset > 0) {
if (lastPosition < mItemCount - 1 || lastBottom > end) {
if (lastPosition == mItemCount - 1) {
// Don't pull the bottom too far up
topOffset = Math.min(topOffset, lastBottom - end);
}
// Move everything up
tryOffsetChildrenTopAndBottom(-topOffset);
if (lastPosition < mItemCount - 1) {
// Fill the gap that was opened below the last position with more rows, if
// possible
fillDown(lastPosition + 1, getFillChildTop() + mDividerHeight);
// Close up the remaining gap
adjustViewsUpOrDown();
}
} else if (lastPosition == mItemCount - 1) {
adjustViewsUpOrDown();
}
}
}
}
@Override
protected void layoutChildren() {
final boolean blockLayoutRequests = mBlockLayoutRequests;
if (!blockLayoutRequests) {
mBlockLayoutRequests = true;
} else {
return;
}
try {
super.layoutChildren();
invalidate();
if (mAdapter == null) {
resetList();
invokeOnItemScrollListener();
return;
}
int childrenTop = mListPadding.top;
//int childrenBottom = mBottom - mTop - mListPadding.bottom;
int childrenBottom = getBottom() - getTop() - mListPadding.bottom;
int childCount = getChildCount();
int index = 0;
View oldFirst = null;
View focusLayoutRestoreView = null;
// Remember stuff we will need down below
switch (mLayoutMode) {
case LAYOUT_FORCE_TOP:
case LAYOUT_FORCE_BOTTOM:
case LAYOUT_SPECIFIC:
case LAYOUT_SYNC:
break;
default:
// Remember the previous first child
oldFirst = getChildAt(0);
}
boolean dataChanged = mDataChanged;
if (dataChanged) {
handleDataChanged();
}
// Handle the empty set by removing all views that are visible
// and calling it a day
if (mItemCount == 0) {
resetList();
invokeOnItemScrollListener();
return;
} else if (mItemCount != mAdapter.getCount()) {
throw new IllegalStateException("The content of the adapter has changed but "
+ "ListView did not receive a notification. Make sure the content of "
+ "your adapter is not modified from a background thread, but only "
+ "from the UI thread. [in ListView(" + getId() + ", " + getClass()
+ ") with Adapter(" + mAdapter.getClass() + ")]");
}
// Pull all children into the RecycleBin.
// These views will be reused if possible
final int firstPosition = mFirstPosition;
final RecycleBin recycleBin = mRecycler;
// reset the focus restoration
// Don't put header or footer views into the Recycler. Those are
// already cached in mHeaderViews;
if (dataChanged) {
for (int i = 0; i < childCount; i++) {
recycleBin.addScrapView(getChildAt(i));
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(getChildAt(i),
ViewDebug.RecyclerTraceType.MOVE_TO_SCRAP_HEAP, index, i);
}
}
} else {
recycleBin.fillActiveViews(childCount, firstPosition);
}
// take focus back to us temporarily to avoid the eventual
// call to clear focus when removing the focused child below
// from messing things up when ViewRoot assigns focus back
// to someone else
final View focusedChild = getFocusedChild();
if (focusedChild != null) {
// TODO: in some cases focusedChild.getParent() == null
// we can remember the focused view to restore after relayout if the
// data hasn't changed, or if the focused position is a header or footer
if (!dataChanged || isDirectChildHeaderOrFooter(focusedChild)) {
// remember the specific view that had focus
focusLayoutRestoreView = findFocus();
if (focusLayoutRestoreView != null) {
// tell it we are going to mess with it
focusLayoutRestoreView.onStartTemporaryDetach();
}
}
requestFocus();
}
switch (mLayoutMode) {
case LAYOUT_SYNC:
onLayoutSync(mSyncPosition);
// Clear out old views
detachAllViewsFromParent();
fillSpecific(mSyncPosition, mSpecificTop);
onLayoutSyncFinished(mSyncPosition);
break;
case LAYOUT_FORCE_BOTTOM:
detachAllViewsFromParent();
fillUp(mItemCount - 1, childrenBottom);
adjustViewsUpOrDown();
break;
case LAYOUT_FORCE_TOP:
detachAllViewsFromParent();
mFirstPosition = 0;
fillFromTop(childrenTop);
adjustViewsUpOrDown();
break;
default:
if (childCount == 0) {
detachAllViewsFromParent();
if (!mStackFromBottom) {
fillFromTop(childrenTop);
} else {
fillUp(mItemCount - 1, childrenBottom);
}
} else {
if (mFirstPosition < mItemCount) {
onLayoutSync(mFirstPosition);
detachAllViewsFromParent();
fillSpecific(mFirstPosition, oldFirst == null ? childrenTop : oldFirst.getTop());
onLayoutSyncFinished(mFirstPosition);
} else {
onLayoutSync(0);
detachAllViewsFromParent();
fillSpecific(0, childrenTop);
onLayoutSyncFinished(0);
}
}
break;
}
// Flush any cached views that did not get reused above
recycleBin.scrapActiveViews();
if (mTouchMode > TOUCH_MODE_DOWN && mTouchMode < TOUCH_MODE_SCROLL) {
View child = getChildAt(mMotionPosition - mFirstPosition);
if (child != null) positionSelector(child);
} else {
mSelectedTop = 0;
mSelectorRect.setEmpty();
}
// even if there is not selected position, we may need to restore
// focus (i.e. something focusable in touch mode)
if (hasFocus() && focusLayoutRestoreView != null) {
focusLayoutRestoreView.requestFocus();
}
// tell focus view we are done mucking with it, if it is still in
// our view hierarchy.
if (focusLayoutRestoreView != null
&& focusLayoutRestoreView.getWindowToken() != null) {
focusLayoutRestoreView.onFinishTemporaryDetach();
}
mLayoutMode = LAYOUT_NORMAL;
mDataChanged = false;
mNeedSync = false;
invokeOnItemScrollListener();
} finally {
if (!blockLayoutRequests) {
mBlockLayoutRequests = false;
}
}
}
/**
* @param child a direct child of this list.
* @return Whether child is a header or footer view.
*/
private boolean isDirectChildHeaderOrFooter(View child) {
final ArrayList<FixedViewInfo> headers = mHeaderViewInfos;
final int numHeaders = headers.size();
for (int i = 0; i < numHeaders; i++) {
if (child == headers.get(i).view) {
return true;
}
}
final ArrayList<FixedViewInfo> footers = mFooterViewInfos;
final int numFooters = footers.size();
for (int i = 0; i < numFooters; i++) {
if (child == footers.get(i).view) {
return true;
}
}
return false;
}
/**
* Obtain the view and add it to our list of children. The view can be made
* fresh, converted from an unused view, or used as is if it was in the
* recycle bin.
*
* @param position Logical position in the list
* @param childrenBottomOrTop Top or bottom edge of the view to add
* @param flow If flow is true, align top edge to y. If false, align bottom
* edge to y.
* @param childrenLeft Left edge where children should be positioned
* @param selected Is this position selected?
* @return View that was added
*/
private View makeAndAddView(int position, int childrenBottomOrTop, boolean flow,
boolean selected) {
View child;
int childrenLeft;
if (!mDataChanged) {
// Try to use an exsiting view for this position
child = mRecycler.getActiveView(position);
if (child != null) {
if (ViewDebug.TRACE_RECYCLER) {
ViewDebug.trace(child, ViewDebug.RecyclerTraceType.RECYCLE_FROM_ACTIVE_HEAP,
position, getChildCount());
}
// Found it -- we're using an existing child
// This just needs to be positioned
childrenLeft = getItemLeft(position);
setupChild(child, position, childrenBottomOrTop, flow, childrenLeft, selected, true);
return child;
}
}
//Notify new item is added to view.
onItemAddedToList( position, flow );
childrenLeft = getItemLeft( position );
// Make a new view for this position, or convert an unused view if possible
child = obtainView(position, mIsScrap);
// This needs to be positioned and measured
setupChild(child, position, childrenBottomOrTop, flow, childrenLeft, selected, mIsScrap[0]);
return child;
}
/**
* @param position position of newly adde ditem.
* @param flow If flow is true, align top edge to y. If false, align bottom edge to y.
*/
protected void onItemAddedToList(int position, boolean flow) {
}
/**
* Add a view as a child and make sure it is measured (if necessary) and
* positioned properly.
*
* @param child The view to add
* @param position The position of this child
* @param y The y position relative to which this view will be positioned
* @param flowDown If true, align top edge to y. If false, align bottom
* edge to y.
* @param childrenLeft Left edge where children should be positioned
* @param selected Is this position selected?
* @param recycled Has this view been pulled from the recycle bin? If so it
* does not need to be remeasured.
*/
private void setupChild(View child, int position, int y, boolean flowDown, int childrenLeft,
boolean selected, boolean recycled) {
final boolean isSelected = selected && shouldShowSelector();
final boolean updateChildSelected = isSelected != child.isSelected();
final int mode = mTouchMode;
final boolean isPressed = mode > TOUCH_MODE_DOWN && mode < TOUCH_MODE_SCROLL &&
mMotionPosition == position;
final boolean updateChildPressed = isPressed != child.isPressed();
final boolean needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested();
// Respect layout params that are already in the view. Otherwise make some up...
// noinspection unchecked
PLA_AbsListView.LayoutParams p = (PLA_AbsListView.LayoutParams) child.getLayoutParams();
if (p == null) {
p = new PLA_AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 0);
}
p.viewType = mAdapter.getItemViewType(position);
if ((recycled && !p.forceAdd) || (p.recycledHeaderFooter &&
p.viewType == PLA_AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER)) {
attachViewToParent(child, flowDown ? -1 : 0, p);
} else {
p.forceAdd = false;
if (p.viewType == PLA_AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER) {
p.recycledHeaderFooter = true;
}
addViewInLayout(child, flowDown ? -1 : 0, p, true);
}
if (updateChildSelected) {
child.setSelected(isSelected);
}
if (updateChildPressed) {
child.setPressed(isPressed);
}
if (needToMeasure) {
int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec,
mListPadding.left + mListPadding.right, p.width);
int lpHeight = p.height;
int childHeightSpec;
if (lpHeight > 0) {
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
}
onMeasureChild( child, position, childWidthSpec, childHeightSpec );
//child.measure(childWidthSpec, childHeightSpec);
} else {
cleanupLayoutState(child);
}
final int w = child.getMeasuredWidth();
final int h = child.getMeasuredHeight();
final int childTop = flowDown ? y : y - h;
if (needToMeasure) {
final int childRight = childrenLeft + w;
final int childBottom = childTop + h;
//child.layout(childrenLeft, childTop, childRight, childBottom);
onLayoutChild(child, position, childrenLeft, childTop, childRight, childBottom);
} else {
final int offsetLeft = childrenLeft - child.getLeft();
final int offsetTop = childTop - child.getTop();
onOffsetChild(child, position, offsetLeft, offsetTop);
}
if (mCachingStarted && !child.isDrawingCacheEnabled()) {
child.setDrawingCacheEnabled(true);
}
}
protected void onOffsetChild(View child, int position, int offsetLeft, int offsetTop) {
child.offsetLeftAndRight(offsetLeft);
child.offsetTopAndBottom(offsetTop);
}
protected void onLayoutChild(View child, int position, int l, int t, int r, int b) {
child.layout(l, t, r, b);
}
/**
* this method is called every time a new child is mesaure.
* @param child
* @param widthMeasureSpec
* @param heightMeasureSpec
*/
protected void onMeasureChild(View child, int position, int widthMeasureSpec, int heightMeasureSpec) {
child.measure(widthMeasureSpec, heightMeasureSpec);
}
/**
* this method is called to adjust child view's up & down.
* @param down
*/
protected void onAdjustChildViews( boolean down ) {
if( down )
correctTooHigh(getChildCount());
else
correctTooLow(getChildCount());
}
@Override
protected boolean canAnimate() {
return super.canAnimate() && mItemCount > 0;
}
/**
* Sets the currently selected item. If in touch mode, the item will not be selected
* but it will still be positioned appropriately. If the specified selection position
* is less than 0, then the item at position 0 will be selected.
*
* @param position Index (starting at 0) of the data item to be selected.
*/
@Override
public void setSelection(int position) {
}
/**
* Find a position that can be selected (i.e., is not a separator).
*
* @param position The starting position to look at.
* @param lookDown Whether to look down for other positions.
* @return The next selectable position starting at position and then searching either up or
* down. Returns {@link #INVALID_POSITION} if nothing can be found.
*/
@Override
int lookForSelectablePosition(int position, boolean lookDown) {
final ListAdapter adapter = mAdapter;
if (adapter == null || isInTouchMode()) {
return INVALID_POSITION;
}
final int count = adapter.getCount();
if (!mAreAllItemsSelectable) {
if (lookDown) {
position = Math.max(0, position);
while (position < count && !adapter.isEnabled(position)) {
position++;
}
} else {
position = Math.min(position, count - 1);
while (position >= 0 && !adapter.isEnabled(position)) {
position--;
}
}
if (position < 0 || position >= count) {
return INVALID_POSITION;
}
return position;
} else {
if (position < 0 || position >= count) {
return INVALID_POSITION;
}
return position;
}
}
@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
boolean populated = super.dispatchPopulateAccessibilityEvent(event);
// If the item count is less than 15 then subtract disabled items from the count and
// position. Otherwise ignore disabled items.
if (!populated) {
int itemCount = 0;
int currentItemIndex = getSelectedItemPosition();
ListAdapter adapter = getAdapter();
if (adapter != null) {
final int count = adapter.getCount();
if (count < 15) {
for (int i = 0; i < count; i++) {
if (adapter.isEnabled(i)) {
itemCount++;
} else if (i <= currentItemIndex) {
currentItemIndex--;
}
}
} else {
itemCount = count;
}
}
event.setItemCount(itemCount);
event.setCurrentItemIndex(currentItemIndex);
}
return populated;
}
/**
* Go to the last or first item if possible (not worrying about panning across or navigating
* within the internal focus of the currently selected item.)
*
* @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN}
*
* @return whether selection was moved
*/
public boolean fullScroll(int direction) {
boolean moved = false;
if (direction == FOCUS_UP) {
int position = lookForSelectablePosition(0, true);
if (position >= 0) {
mLayoutMode = LAYOUT_FORCE_TOP;
invokeOnItemScrollListener();
moved = true;
}
} else if (direction == FOCUS_DOWN) {
int position = lookForSelectablePosition(mItemCount - 1, true);
if (position >= 0) {
mLayoutMode = LAYOUT_FORCE_BOTTOM;
invokeOnItemScrollListener();
}
moved = true;
}
if (moved && !awakenScrollBars()) {
awakenScrollBars();
invalidate();
}
return moved;
}
/**
* Scroll the children by amount, adding a view at the end and removing
* views that fall off as necessary.
*
* @param amount The amount (positive or negative) to scroll.
*/
private void scrollListItemsBy(int amount) {
// offsetChildrenTopAndBottom(amount);
tryOffsetChildrenTopAndBottom(amount);
final int listBottom = getHeight() - mListPadding.bottom;
final int listTop = mListPadding.top;
final PLA_AbsListView.RecycleBin recycleBin = mRecycler;
if (amount < 0) {
// shifted items up
// may need to pan views into the bottom space
View last = getLastChild();
int numChildren = getChildCount();
// View last = getChildAt(numChildren - 1);
while (last.getBottom() < listBottom) {
final int lastVisiblePosition = mFirstPosition + numChildren - 1;
if (lastVisiblePosition < mItemCount - 1) {
addViewBelow(last, lastVisiblePosition);
last = getLastChild();
numChildren++;
} else {
break;
}
}
// may have brought in the last child of the list that is skinnier
// than the fading edge, thereby leaving space at the end. need
// to shift back
if (last.getBottom() < listBottom) {
// offsetChildrenTopAndBottom(listBottom - last.getBottom());
tryOffsetChildrenTopAndBottom(listBottom - last.getBottom());
}
// top views may be panned off screen
View first = getChildAt(0);
while (first.getBottom() < listTop) {
PLA_AbsListView.LayoutParams layoutParams = (LayoutParams) first.getLayoutParams();
if (recycleBin.shouldRecycleViewType(layoutParams.viewType)) {
detachViewFromParent(first);
recycleBin.addScrapView(first);
} else {
removeViewInLayout(first);
}
first = getChildAt(0);
mFirstPosition++;
}
} else {
// shifted items down
View first = getChildAt(0);
// may need to pan views into top
while ((first.getTop() > listTop) && (mFirstPosition > 0)) {
first = addViewAbove(first, mFirstPosition);
mFirstPosition--;
}
// may have brought the very first child of the list in too far and
// need to shift it back
if (first.getTop() > listTop) {
// offsetChildrenTopAndBottom(listTop - first.getTop());
tryOffsetChildrenTopAndBottom(listTop - first.getTop());
}
int lastIndex = getChildCount() - 1;
View last = getChildAt(lastIndex);
// bottom view may be panned off screen
while (last.getTop() > listBottom) {
PLA_AbsListView.LayoutParams layoutParams = (LayoutParams) last.getLayoutParams();
if (recycleBin.shouldRecycleViewType(layoutParams.viewType)) {
detachViewFromParent(last);
recycleBin.addScrapView(last);
} else {
removeViewInLayout(last);
}
last = getChildAt(--lastIndex);
}
}
}
protected View getLastChild() {
int numChildren = getChildCount();
return getChildAt(numChildren - 1);
}
private View addViewAbove(View theView, int position) {
int abovePosition = position - 1;
View view = obtainView(abovePosition, mIsScrap);
int edgeOfNewChild = theView.getTop() - mDividerHeight;
setupChild(view, abovePosition, edgeOfNewChild, false, mListPadding.left,
false, mIsScrap[0]);
return view;
}
private View addViewBelow(View theView, int position) {
int belowPosition = position + 1;
View view = obtainView(belowPosition, mIsScrap);
int edgeOfNewChild = theView.getBottom() + mDividerHeight;
setupChild(view, belowPosition, edgeOfNewChild, true, mListPadding.left,
false, mIsScrap[0]);
return view;
}
/**
* Indicates that the views created by the ListAdapter can contain focusable
* items.
*
* @param itemsCanFocus true if items can get focus, false otherwise
*/
public void setItemsCanFocus(boolean itemsCanFocus) {
mItemsCanFocus = itemsCanFocus;
if (!itemsCanFocus) {
setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
}
}
/**
* @return Whether the views created by the ListAdapter can contain focusable
* items.
*/
public boolean getItemsCanFocus() {
return mItemsCanFocus;
}
/**
* @hide Pending API council approval.
*/
@Override
public boolean isOpaque() {
// return (mCachingStarted && mIsCacheColorOpaque && mDividerIsOpaque &&
// hasOpaqueScrollbars()) || super.isOpaque();
//we can ignore scrollbar...
return (mCachingStarted && mIsCacheColorOpaque && mDividerIsOpaque) || super.isOpaque();
}
@Override
public void setCacheColorHint(int color) {
final boolean opaque = (color >>> 24) == 0xFF;
mIsCacheColorOpaque = opaque;
if (opaque) {
if (mDividerPaint == null) {
mDividerPaint = new Paint();
}
mDividerPaint.setColor(color);
}
super.setCacheColorHint(color);
}
void drawOverscrollHeader(Canvas canvas, Drawable drawable, Rect bounds) {
final int height = drawable.getMinimumHeight();
canvas.save();
canvas.clipRect(bounds);
final int span = bounds.bottom - bounds.top;
if (span < height) {
bounds.top = bounds.bottom - height;
}
drawable.setBounds(bounds);
drawable.draw(canvas);
canvas.restore();
}
void drawOverscrollFooter(Canvas canvas, Drawable drawable, Rect bounds) {
final int height = drawable.getMinimumHeight();
canvas.save();
canvas.clipRect(bounds);
final int span = bounds.bottom - bounds.top;
if (span < height) {
bounds.bottom = bounds.top + height;
}
drawable.setBounds(bounds);
drawable.draw(canvas);
canvas.restore();
}
@Override
protected void dispatchDraw(Canvas canvas) {
// Draw the dividers
final int dividerHeight = mDividerHeight;
final Drawable overscrollHeader = mOverScrollHeader;
final Drawable overscrollFooter = mOverScrollFooter;
final boolean drawOverscrollHeader = overscrollHeader != null;
final boolean drawOverscrollFooter = overscrollFooter != null;
final boolean drawDividers = dividerHeight > 0 && mDivider != null;
if (drawDividers || drawOverscrollHeader || drawOverscrollFooter) {
// Only modify the top and bottom in the loop, we set the left and right here
final Rect bounds = mTempRect;
// bounds.left = mPaddingLeft;
// bounds.right = mRight - mLeft - mPaddingRight;
bounds.left = getPaddingLeft();
bounds.right = getRight() - getLeft() - getPaddingRight();
final int count = getChildCount();
final int headerCount = mHeaderViewInfos.size();
final int itemCount = mItemCount;
final int footerLimit = itemCount - mFooterViewInfos.size() - 1;
final boolean headerDividers = mHeaderDividersEnabled;
final boolean footerDividers = mFooterDividersEnabled;
final int first = mFirstPosition;
final boolean areAllItemsSelectable = mAreAllItemsSelectable;
final ListAdapter adapter = mAdapter;
// If the list is opaque *and* the background is not, we want to
// fill a rect where the dividers would be for non-selectable items
// If the list is opaque and the background is also opaque, we don't
// need to draw anything since the background will do it for us
final boolean fillForMissingDividers = drawDividers && isOpaque() && !super.isOpaque();
if (fillForMissingDividers && mDividerPaint == null && mIsCacheColorOpaque) {
mDividerPaint = new Paint();
mDividerPaint.setColor(getCacheColorHint());
}
final Paint paint = mDividerPaint;
// final int listBottom = mBottom - mTop - mListPadding.bottom + mScrollY;
final int listBottom = getBottom() - getTop() - mListPadding.bottom + getScrollY();
if (!mStackFromBottom) {
int bottom = 0;
// Draw top divider or header for overscroll
// final int scrollY = mScrollY;
final int scrollY = getScrollY();
if (count > 0 && scrollY < 0) {
if (drawOverscrollHeader) {
bounds.bottom = 0;
bounds.top = scrollY;
drawOverscrollHeader(canvas, overscrollHeader, bounds);
} else if (drawDividers) {
bounds.bottom = 0;
bounds.top = -dividerHeight;
drawDivider(canvas, bounds, -1);
}
}
for (int i = 0; i < count; i++) {
if ((headerDividers || first + i >= headerCount) &&
(footerDividers || first + i < footerLimit)) {
View child = getChildAt(i);
bottom = child.getBottom();
// Don't draw dividers next to items that are not enabled
if (drawDividers &&
(bottom < listBottom && !(drawOverscrollFooter && i == count - 1))) {
if ((areAllItemsSelectable ||
(adapter.isEnabled(first + i) && (i == count - 1 ||
adapter.isEnabled(first + i + 1))))) {
bounds.top = bottom;
bounds.bottom = bottom + dividerHeight;
drawDivider(canvas, bounds, i);
} else if (fillForMissingDividers) {
bounds.top = bottom;
bounds.bottom = bottom + dividerHeight;
canvas.drawRect(bounds, paint);
}
}
}
}
// final int overFooterBottom = mBottom + mScrollY;
final int overFooterBottom = getBottom() + getScrollY();
if (drawOverscrollFooter && first + count == itemCount &&
overFooterBottom > bottom) {
bounds.top = bottom;
bounds.bottom = overFooterBottom;
drawOverscrollFooter(canvas, overscrollFooter, bounds);
}
} else {
int top;
int listTop = mListPadding.top;
// final int scrollY = mScrollY;
final int scrollY = getScrollY();
if (count > 0 && drawOverscrollHeader) {
bounds.top = scrollY;
bounds.bottom = getChildAt(0).getTop();
drawOverscrollHeader(canvas, overscrollHeader, bounds);
}
final int start = drawOverscrollHeader ? 1 : 0;
for (int i = start; i < count; i++) {
if ((headerDividers || first + i >= headerCount) &&
(footerDividers || first + i < footerLimit)) {
View child = getChildAt(i);
top = child.getTop();
// Don't draw dividers next to items that are not enabled
if (drawDividers && top > listTop) {
if ((areAllItemsSelectable ||
(adapter.isEnabled(first + i) && (i == count - 1 ||
adapter.isEnabled(first + i + 1))))) {
bounds.top = top - dividerHeight;
bounds.bottom = top;
// Give the method the child ABOVE the divider, so we
// subtract one from our child
// position. Give -1 when there is no child above the
// divider.
drawDivider(canvas, bounds, i - 1);
} else if (fillForMissingDividers) {
bounds.top = top - dividerHeight;
bounds.bottom = top;
canvas.drawRect(bounds, paint);
}
}
}
}
if (count > 0 && scrollY > 0) {
if (drawOverscrollFooter) {
// final int absListBottom = mBottom;
final int absListBottom = getBottom();
bounds.top = absListBottom;
bounds.bottom = absListBottom + scrollY;
drawOverscrollFooter(canvas, overscrollFooter, bounds);
} else if (drawDividers) {
bounds.top = listBottom;
bounds.bottom = listBottom + dividerHeight;
drawDivider(canvas, bounds, -1);
}
}
}
}
// Draw the indicators (these should be drawn above the dividers) and children
super.dispatchDraw(canvas);
}
/**
* Draws a divider for the given child in the given bounds.
*
* @param canvas The canvas to draw to.
* @param bounds The bounds of the divider.
* @param childIndex The index of child (of the View) above the divider.
* This will be -1 if there is no child above the divider to be
* drawn.
*/
void drawDivider(Canvas canvas, Rect bounds, int childIndex) {
// This widget draws the same divider for all children
final Drawable divider = mDivider;
final boolean clipDivider = mClipDivider;
if (!clipDivider) {
divider.setBounds(bounds);
} else {
canvas.save();
canvas.clipRect(bounds);
}
divider.draw(canvas);
if (clipDivider) {
canvas.restore();
}
}
/**
* Returns the drawable that will be drawn between each item in the list.
*
* @return the current drawable drawn between list elements
*/
public Drawable getDivider() {
return mDivider;
}
/**
* Sets the drawable that will be drawn between each item in the list. If the drawable does
* not have an intrinsic height, you should also call {@link #setDividerHeight(int)}
*
* @param divider The drawable to use.
*/
public void setDivider(Drawable divider) {
if (divider != null) {
mDividerHeight = divider.getIntrinsicHeight();
mClipDivider = divider instanceof ColorDrawable;
} else {
mDividerHeight = 0;
mClipDivider = false;
}
mDivider = divider;
mDividerIsOpaque = divider == null || divider.getOpacity() == PixelFormat.OPAQUE;
requestLayoutIfNecessary();
}
/**
* @return Returns the height of the divider that will be drawn between each item in the list.
*/
public int getDividerHeight() {
return mDividerHeight;
}
/**
* Sets the height of the divider that will be drawn between each item in the list. Calling
* this will override the intrinsic height as set by {@link #setDivider(Drawable)}
*
* @param height The new height of the divider in pixels.
*/
public void setDividerHeight(int height) {
mDividerHeight = height;
requestLayoutIfNecessary();
}
/**
* Enables or disables the drawing of the divider for header views.
*
* @param headerDividersEnabled True to draw the headers, false otherwise.
*
* @see #setFooterDividersEnabled(boolean)
* @see #addHeaderView(android.view.View)
*/
public void setHeaderDividersEnabled(boolean headerDividersEnabled) {
mHeaderDividersEnabled = headerDividersEnabled;
invalidate();
}
/**
* Enables or disables the drawing of the divider for footer views.
*
* @param footerDividersEnabled True to draw the footers, false otherwise.
*
* @see #setHeaderDividersEnabled(boolean)
* @see #addFooterView(android.view.View)
*/
public void setFooterDividersEnabled(boolean footerDividersEnabled) {
mFooterDividersEnabled = footerDividersEnabled;
invalidate();
}
/**
* Sets the drawable that will be drawn above all other list content.
* This area can become visible when the user overscrolls the list.
*
* @param header The drawable to use
*/
public void setOverscrollHeader(Drawable header) {
mOverScrollHeader = header;
// if (mScrollY < 0) {
// invalidate();
// }
if (getScrollY() < 0) {
invalidate();
}
}
/**
* @return The drawable that will be drawn above all other list content
*/
public Drawable getOverscrollHeader() {
return mOverScrollHeader;
}
/**
* Sets the drawable that will be drawn below all other list content.
* This area can become visible when the user overscrolls the list,
* or when the list's content does not fully fill the container area.
*
* @param footer The drawable to use
*/
public void setOverscrollFooter(Drawable footer) {
mOverScrollFooter = footer;
invalidate();
}
/**
* @return The drawable that will be drawn below all other list content
*/
public Drawable getOverscrollFooter() {
return mOverScrollFooter;
}
@Override
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
if(DEBUG)
Log.v("PLA_ListView", "onFocusChanged");
int closetChildIndex = -1;
if (gainFocus && previouslyFocusedRect != null) {
//previouslyFocusedRect.offset(mScrollX, mScrollY);
previouslyFocusedRect.offset(getScrollX(), getScrollY());
final ListAdapter adapter = mAdapter;
// Don't cache the result of getChildCount or mFirstPosition here,
// it could change in layoutChildren.
if (adapter.getCount() < getChildCount() + mFirstPosition) {
mLayoutMode = LAYOUT_NORMAL;
layoutChildren();
}
// figure out which item should be selected based on previously
// focused rect
Rect otherRect = mTempRect;
int minDistance = Integer.MAX_VALUE;
final int childCount = getChildCount();
final int firstPosition = mFirstPosition;
for (int i = 0; i < childCount; i++) {
// only consider selectable views
if (!adapter.isEnabled(firstPosition + i)) {
continue;
}
View other = getChildAt(i);
other.getDrawingRect(otherRect);
offsetDescendantRectToMyCoords(other, otherRect);
int distance = getDistance(previouslyFocusedRect, otherRect, direction);
if (distance < minDistance) {
minDistance = distance;
closetChildIndex = i;
}
}
}
if (closetChildIndex >= 0) {
setSelection(closetChildIndex + mFirstPosition);
} else {
requestLayout();
}
}
/*
* (non-Javadoc)
*
* Children specified in XML are assumed to be header views. After we have
* parsed them move them out of the children list and into mHeaderViews.
*/
@Override
protected void onFinishInflate() {
super.onFinishInflate();
int count = getChildCount();
if (count > 0) {
for (int i = 0; i < count; ++i) {
addHeaderView(getChildAt(i));
}
removeAllViews();
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mItemsCanFocus && ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
// Don't handle edge touches immediately -- they may actually belong to one of our
// descendants.
return false;
}
return super.onTouchEvent(ev);
}
@Override
public boolean performItemClick(View view, int position, long id) {
boolean handled = false;
handled |= super.performItemClick(view, position, id);
return handled;
}
/**
* Sets the checked state of the specified position. The is only valid if
* the choice mode has been set to {@link #CHOICE_MODE_SINGLE} or
* {@link #CHOICE_MODE_MULTIPLE}.
*
* @param position The item whose checked state is to be checked
* @param value The new checked state for the item
*/
public void setItemChecked(int position, boolean value) {
}
/**
* Returns the checked state of the specified position. The result is only
* valid if the choice mode has been set to {@link #CHOICE_MODE_SINGLE}
* or {@link #CHOICE_MODE_MULTIPLE}.
*
* @param position The item whose checked state to return
* @return The item's checked state or <code>false</code> if choice mode
* is invalid
*
* @see #setChoiceMode(int)
*/
public boolean isItemChecked(int position) {
return false;
}
/**
* Returns the currently checked item. The result is only valid if the choice
* mode has been set to {@link #CHOICE_MODE_SINGLE}.
*
* @return The position of the currently checked item or
* {@link #INVALID_POSITION} if nothing is selected
*
* @see #setChoiceMode(int)
*/
public int getCheckedItemPosition() {
return INVALID_POSITION;
}
/**
* Returns the set of checked items in the list. The result is only valid if
* the choice mode has not been set to {@link #CHOICE_MODE_NONE}.
*
* @return A SparseBooleanArray which will return true for each call to
* get(int position) where position is a position in the list,
* or <code>null</code> if the choice mode is set to
* {@link #CHOICE_MODE_NONE}.
*/
public SparseBooleanArray getCheckedItemPositions() {
return null;
}
/**
* Returns the set of checked items ids. The result is only valid if the
* choice mode has not been set to {@link #CHOICE_MODE_NONE}.
*
* @return A new array which contains the id of each checked item in the
* list.
*
* @deprecated Use {@link #getCheckedItemIds()} instead.
*/
@Deprecated
public long[] getCheckItemIds() {
// Use new behavior that correctly handles stable ID mapping.
if (mAdapter != null && mAdapter.hasStableIds()) {
return getCheckedItemIds();
}
return new long[0];
}
/**
* Returns the set of checked items ids. The result is only valid if the
* choice mode has not been set to {@link #CHOICE_MODE_NONE} and the adapter
* has stable IDs. ({@link ListAdapter#hasStableIds()} == {@code true})
*
* @return A new array which contains the id of each checked item in the
* list.
*/
public long[] getCheckedItemIds() {
return new long[0];
}
/**
* Clear any choices previously set
*/
public void clearChoices() {
}
}//end of class