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package com.android.launcher3;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.android.launcher3.compat.AlphabeticIndexCompat;
/**
* The grid view adapter of all the apps.
*/
class AppsGridAdapter extends RecyclerView.Adapter<AppsGridAdapter.ViewHolder> {
public static final String TAG = "AppsGridAdapter";
private static final int SECTION_BREAK_VIEW_TYPE = 0;
private static final int ICON_VIEW_TYPE = 1;
/**
* ViewHolder for each icon.
*/
public static class ViewHolder extends RecyclerView.ViewHolder {
public View mContent;
public boolean mIsSectionRow;
public ViewHolder(View v, boolean isSectionRow) {
super(v);
mContent = v;
mIsSectionRow = isSectionRow;
}
}
/**
* Helper class to size the grid items.
*/
public class GridSpanSizer extends GridLayoutManager.SpanSizeLookup {
@Override
public int getSpanSize(int position) {
AppInfo info = mApps.getApps().get(position);
if (info == AlphabeticalAppsList.SECTION_BREAK_INFO) {
return mAppsPerRow;
} else {
return 1;
}
}
}
/**
* Helper class to draw the section headers
*/
public class GridItemDecoration extends RecyclerView.ItemDecoration {
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
AlphabeticIndexCompat indexer = mApps.getIndexer();
for (int i = 0; i < parent.getChildCount(); i++) {
View child = parent.getChildAt(i);
ViewHolder holder = (ViewHolder) parent.getChildViewHolder(child);
if (holder != null) {
GridLayoutManager.LayoutParams lp = (GridLayoutManager.LayoutParams)
child.getLayoutParams();
if (!holder.mIsSectionRow && !lp.isItemRemoved()) {
if (mApps.getApps().get(holder.getPosition() - 1) ==
AlphabeticalAppsList.SECTION_BREAK_INFO) {
// Draw at the parent
AppInfo info = mApps.getApps().get(holder.getPosition());
String section = mApps.getSectionNameForApp(info);
mSectionTextPaint.getTextBounds(section, 0, section.length(),
mTmpBounds);
if (mIsRtl) {
c.drawText(section, parent.getWidth() - mStartMargin +
(mStartMargin - mTmpBounds.width()) / 2,
child.getTop() + (2 * child.getPaddingTop()) +
mTmpBounds.height(), mSectionTextPaint);
} else {
c.drawText(section, (mStartMargin - mTmpBounds.width()) / 2,
child.getTop() + (2 * child.getPaddingTop()) +
mTmpBounds.height(), mSectionTextPaint);
}
}
}
}
}
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
RecyclerView.State state) {
// Do nothing
}
}
private LayoutInflater mLayoutInflater;
private AlphabeticalAppsList mApps;
private GridSpanSizer mGridSizer;
private GridItemDecoration mItemDecoration;
private View.OnTouchListener mTouchListener;
private View.OnClickListener mIconClickListener;
private View.OnLongClickListener mIconLongClickListener;
private int mAppsPerRow;
private boolean mIsRtl;
// Section drawing
private int mStartMargin;
private Paint mSectionTextPaint;
private Rect mTmpBounds = new Rect();
public AppsGridAdapter(Context context, AlphabeticalAppsList apps, int appsPerRow,
View.OnTouchListener touchListener, View.OnClickListener iconClickListener,
View.OnLongClickListener iconLongClickListener) {
Resources res = context.getResources();
mApps = apps;
mAppsPerRow = appsPerRow;
mGridSizer = new GridSpanSizer();
mItemDecoration = new GridItemDecoration();
mLayoutInflater = LayoutInflater.from(context);
mTouchListener = touchListener;
mIconClickListener = iconClickListener;
mIconLongClickListener = iconLongClickListener;
mStartMargin = res.getDimensionPixelSize(R.dimen.apps_grid_view_start_margin);
mSectionTextPaint = new Paint();
mSectionTextPaint.setTextSize(res.getDimensionPixelSize(
R.dimen.apps_view_section_text_size));
mSectionTextPaint.setColor(res.getColor(R.color.apps_view_section_text_color));
mSectionTextPaint.setAntiAlias(true);
}
/**
* Sets whether we are in RTL mode.
*/
public void setRtl(boolean rtl) {
mIsRtl = rtl;
}
/**
* Returns the grid layout manager.
*/
public GridLayoutManager getLayoutManager(Context context) {
GridLayoutManager layoutMgr = new GridLayoutManager(context, mAppsPerRow,
GridLayoutManager.VERTICAL, false);
layoutMgr.setSpanSizeLookup(mGridSizer);
return layoutMgr;
}
/**
* Returns the item decoration for the recycler view.
*/
public RecyclerView.ItemDecoration getItemDecoration() {
return mItemDecoration;
}
/**
* Returns the left padding for the recycler view.
*/
public int getContentMarginStart() {
return mStartMargin;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case SECTION_BREAK_VIEW_TYPE:
return new ViewHolder(new View(parent.getContext()), true);
case ICON_VIEW_TYPE:
BubbleTextView icon = (BubbleTextView) mLayoutInflater.inflate(
R.layout.apps_grid_row_icon_view, parent, false);
icon.setOnTouchListener(mTouchListener);
icon.setOnClickListener(mIconClickListener);
icon.setOnLongClickListener(mIconLongClickListener);
icon.setFocusable(true);
return new ViewHolder(icon, false);
default:
throw new RuntimeException("Unexpected view type");
}
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
AppInfo info = mApps.getApps().get(position);
if (info != AlphabeticalAppsList.SECTION_BREAK_INFO) {
BubbleTextView icon = (BubbleTextView) holder.mContent;
icon.applyFromApplicationInfo(info);
}
}
@Override
public int getItemCount() {
return mApps.getApps().size();
}
@Override
public int getItemViewType(int position) {
if (mApps.getApps().get(position) == AlphabeticalAppsList.SECTION_BREAK_INFO) {
return SECTION_BREAK_VIEW_TYPE;
}
return ICON_VIEW_TYPE;
}
}
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