diff options
Diffstat (limited to 'src/com/android/launcher3/allapps/AllAppsGridAdapter.java')
| -rw-r--r-- | src/com/android/launcher3/allapps/AllAppsGridAdapter.java | 488 |
1 files changed, 488 insertions, 0 deletions
diff --git a/src/com/android/launcher3/allapps/AllAppsGridAdapter.java b/src/com/android/launcher3/allapps/AllAppsGridAdapter.java new file mode 100644 index 000000000..e96567c41 --- /dev/null +++ b/src/com/android/launcher3/allapps/AllAppsGridAdapter.java @@ -0,0 +1,488 @@ +/* + * Copyright (C) 2015 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.android.launcher3.allapps; + +import android.content.Context; +import android.content.res.Resources; +import android.graphics.Canvas; +import android.graphics.Paint; +import android.graphics.PointF; +import android.graphics.Rect; +import android.os.Handler; +import android.support.v4.view.accessibility.AccessibilityRecordCompat; +import android.support.v4.view.accessibility.AccessibilityEventCompat; +import android.support.v7.widget.GridLayoutManager; +import android.support.v7.widget.RecyclerView; +import android.view.LayoutInflater; +import android.view.View; +import android.view.ViewConfiguration; +import android.view.ViewGroup; +import android.view.accessibility.AccessibilityEvent; +import android.widget.TextView; +import com.android.launcher3.AppInfo; +import com.android.launcher3.BubbleTextView; +import com.android.launcher3.R; +import com.android.launcher3.Utilities; +import com.android.launcher3.util.Thunk; + +import java.util.HashMap; +import java.util.List; + + +/** + * The grid view adapter of all the apps. + */ +class AllAppsGridAdapter extends RecyclerView.Adapter<AllAppsGridAdapter.ViewHolder> { + + public static final String TAG = "AppsGridAdapter"; + private static final boolean DEBUG = false; + + // A section break in the grid + public static final int SECTION_BREAK_VIEW_TYPE = 0; + // A normal icon + public static final int ICON_VIEW_TYPE = 1; + // A prediction icon + public static final int PREDICTION_ICON_VIEW_TYPE = 2; + // The message shown when there are no filtered results + public static final int EMPTY_SEARCH_VIEW_TYPE = 3; + + /** + * ViewHolder for each icon. + */ + public static class ViewHolder extends RecyclerView.ViewHolder { + public View mContent; + + public ViewHolder(View v) { + super(v); + mContent = v; + } + } + + /** + * A subclass of GridLayoutManager that overrides accessibility values during app search. + */ + public class AppsGridLayoutManager extends GridLayoutManager { + + public AppsGridLayoutManager(Context context) { + super(context, 1, GridLayoutManager.VERTICAL, false); + } + + @Override + public void onInitializeAccessibilityEvent(AccessibilityEvent event) { + super.onInitializeAccessibilityEvent(event); + if (mApps.hasNoFilteredResults()) { + // Disregard the no-search-results text as a list item for accessibility + final AccessibilityRecordCompat record = AccessibilityEventCompat + .asRecord(event); + record.setItemCount(0); + } + } + + @Override + public int getRowCountForAccessibility(RecyclerView.Recycler recycler, + RecyclerView.State state) { + if (mApps.hasNoFilteredResults()) { + // Disregard the no-search-results text as a list item for accessibility + return 0; + } else { + return super.getRowCountForAccessibility(recycler, state); + } + } + } + + /** + * Helper class to size the grid items. + */ + public class GridSpanSizer extends GridLayoutManager.SpanSizeLookup { + + public GridSpanSizer() { + super(); + setSpanIndexCacheEnabled(true); + } + + @Override + public int getSpanSize(int position) { + if (mApps.hasNoFilteredResults()) { + // Empty view spans full width + return mAppsPerRow; + } + + switch (mApps.getAdapterItems().get(position).viewType) { + case AllAppsGridAdapter.ICON_VIEW_TYPE: + case AllAppsGridAdapter.PREDICTION_ICON_VIEW_TYPE: + return 1; + default: + // Section breaks span the full width + return mAppsPerRow; + } + } + } + + /** + * Helper class to draw the section headers + */ + public class GridItemDecoration extends RecyclerView.ItemDecoration { + + private static final boolean DEBUG_SECTION_MARGIN = false; + private static final boolean FADE_OUT_SECTIONS = false; + + private HashMap<String, PointF> mCachedSectionBounds = new HashMap<>(); + private Rect mTmpBounds = new Rect(); + + @Override + public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { + if (mApps.hasFilter() || mAppsPerRow == 0) { + return; + } + + if (DEBUG_SECTION_MARGIN) { + Paint p = new Paint(); + p.setColor(0x33ff0000); + c.drawRect(mBackgroundPadding.left, 0, mBackgroundPadding.left + mSectionNamesMargin, + parent.getMeasuredHeight(), p); + } + + List<AlphabeticalAppsList.AdapterItem> items = mApps.getAdapterItems(); + boolean hasDrawnPredictedAppsDivider = false; + boolean showSectionNames = mSectionNamesMargin > 0; + int childCount = parent.getChildCount(); + int lastSectionTop = 0; + int lastSectionHeight = 0; + for (int i = 0; i < childCount; i++) { + View child = parent.getChildAt(i); + ViewHolder holder = (ViewHolder) parent.getChildViewHolder(child); + if (!isValidHolderAndChild(holder, child, items)) { + continue; + } + + if (shouldDrawItemDivider(holder, items) && !hasDrawnPredictedAppsDivider) { + // Draw the divider under the predicted apps + int top = child.getTop() + child.getHeight() + mPredictionBarDividerOffset; + c.drawLine(mBackgroundPadding.left, top, + parent.getWidth() - mBackgroundPadding.right, top, + mPredictedAppsDividerPaint); + hasDrawnPredictedAppsDivider = true; + + } else if (showSectionNames && shouldDrawItemSection(holder, i, items)) { + // At this point, we only draw sections for each section break; + int viewTopOffset = (2 * child.getPaddingTop()); + int pos = holder.getPosition(); + AlphabeticalAppsList.AdapterItem item = items.get(pos); + AlphabeticalAppsList.SectionInfo sectionInfo = item.sectionInfo; + + // Draw all the sections for this index + String lastSectionName = item.sectionName; + for (int j = item.sectionAppIndex; j < sectionInfo.numApps; j++, pos++) { + AlphabeticalAppsList.AdapterItem nextItem = items.get(pos); + String sectionName = nextItem.sectionName; + if (nextItem.sectionInfo != sectionInfo) { + break; + } + if (j > item.sectionAppIndex && sectionName.equals(lastSectionName)) { + continue; + } + + + // Find the section name bounds + PointF sectionBounds = getAndCacheSectionBounds(sectionName); + + // Calculate where to draw the section + int sectionBaseline = (int) (viewTopOffset + sectionBounds.y); + int x = mIsRtl ? + parent.getWidth() - mBackgroundPadding.left - mSectionNamesMargin : + mBackgroundPadding.left; + x += (int) ((mSectionNamesMargin - sectionBounds.x) / 2f); + int y = child.getTop() + sectionBaseline; + + // Determine whether this is the last row with apps in that section, if + // so, then fix the section to the row allowing it to scroll past the + // baseline, otherwise, bound it to the baseline so it's in the viewport + int appIndexInSection = items.get(pos).sectionAppIndex; + int nextRowPos = Math.min(items.size() - 1, + pos + mAppsPerRow - (appIndexInSection % mAppsPerRow)); + AlphabeticalAppsList.AdapterItem nextRowItem = items.get(nextRowPos); + boolean fixedToRow = !sectionName.equals(nextRowItem.sectionName); + if (!fixedToRow) { + y = Math.max(sectionBaseline, y); + } + + // In addition, if it overlaps with the last section that was drawn, then + // offset it so that it does not overlap + if (lastSectionHeight > 0 && y <= (lastSectionTop + lastSectionHeight)) { + y += lastSectionTop - y + lastSectionHeight; + } + + // Draw the section header + if (FADE_OUT_SECTIONS) { + int alpha = 255; + if (fixedToRow) { + alpha = Math.min(255, + (int) (255 * (Math.max(0, y) / (float) sectionBaseline))); + } + mSectionTextPaint.setAlpha(alpha); + } + c.drawText(sectionName, x, y, mSectionTextPaint); + + lastSectionTop = y; + lastSectionHeight = (int) (sectionBounds.y + mSectionHeaderOffset); + lastSectionName = sectionName; + } + i += (sectionInfo.numApps - item.sectionAppIndex); + } + } + } + + @Override + public void getItemOffsets(Rect outRect, View view, RecyclerView parent, + RecyclerView.State state) { + // Do nothing + } + + /** + * Given a section name, return the bounds of the given section name. + */ + private PointF getAndCacheSectionBounds(String sectionName) { + PointF bounds = mCachedSectionBounds.get(sectionName); + if (bounds == null) { + mSectionTextPaint.getTextBounds(sectionName, 0, sectionName.length(), mTmpBounds); + bounds = new PointF(mSectionTextPaint.measureText(sectionName), mTmpBounds.height()); + mCachedSectionBounds.put(sectionName, bounds); + } + return bounds; + } + + /** + * Returns whether we consider this a valid view holder for us to draw a divider or section for. + */ + private boolean isValidHolderAndChild(ViewHolder holder, View child, + List<AlphabeticalAppsList.AdapterItem> items) { + // Ensure item is not already removed + GridLayoutManager.LayoutParams lp = (GridLayoutManager.LayoutParams) + child.getLayoutParams(); + if (lp.isItemRemoved()) { + return false; + } + // Ensure we have a valid holder + if (holder == null) { + return false; + } + // Ensure we have a holder position + int pos = holder.getPosition(); + if (pos < 0 || pos >= items.size()) { + return false; + } + return true; + } + + /** + * Returns whether to draw the divider for a given child. + */ + private boolean shouldDrawItemDivider(ViewHolder holder, + List<AlphabeticalAppsList.AdapterItem> items) { + int pos = holder.getPosition(); + return items.get(pos).viewType == AllAppsGridAdapter.PREDICTION_ICON_VIEW_TYPE; + } + + /** + * Returns whether to draw the section for the given child. + */ + private boolean shouldDrawItemSection(ViewHolder holder, int childIndex, + List<AlphabeticalAppsList.AdapterItem> items) { + int pos = holder.getPosition(); + AlphabeticalAppsList.AdapterItem item = items.get(pos); + + // Ensure it's an icon + if (item.viewType != AllAppsGridAdapter.ICON_VIEW_TYPE) { + return false; + } + // Draw the section header for the first item in each section + return (childIndex == 0) || + (items.get(pos - 1).viewType == AllAppsGridAdapter.SECTION_BREAK_VIEW_TYPE); + } + } + + private LayoutInflater mLayoutInflater; + @Thunk AlphabeticalAppsList mApps; + private GridLayoutManager mGridLayoutMgr; + private GridSpanSizer mGridSizer; + private GridItemDecoration mItemDecoration; + private View.OnTouchListener mTouchListener; + private View.OnClickListener mIconClickListener; + private View.OnLongClickListener mIconLongClickListener; + @Thunk final Rect mBackgroundPadding = new Rect(); + @Thunk int mPredictionBarDividerOffset; + @Thunk int mAppsPerRow; + @Thunk boolean mIsRtl; + private String mEmptySearchText; + + // Section drawing + @Thunk int mSectionNamesMargin; + @Thunk int mSectionHeaderOffset; + @Thunk Paint mSectionTextPaint; + @Thunk Paint mPredictedAppsDividerPaint; + + public AllAppsGridAdapter(Context context, AlphabeticalAppsList apps, + View.OnTouchListener touchListener, View.OnClickListener iconClickListener, + View.OnLongClickListener iconLongClickListener) { + Resources res = context.getResources(); + mApps = apps; + mGridSizer = new GridSpanSizer(); + mGridLayoutMgr = new AppsGridLayoutManager(context); + mGridLayoutMgr.setSpanSizeLookup(mGridSizer); + mItemDecoration = new GridItemDecoration(); + mLayoutInflater = LayoutInflater.from(context); + mTouchListener = touchListener; + mIconClickListener = iconClickListener; + mIconLongClickListener = iconLongClickListener; + mSectionNamesMargin = res.getDimensionPixelSize(R.dimen.all_apps_grid_view_start_margin); + mSectionHeaderOffset = res.getDimensionPixelSize(R.dimen.all_apps_grid_section_y_offset); + + mSectionTextPaint = new Paint(); + mSectionTextPaint.setTextSize(res.getDimensionPixelSize( + R.dimen.all_apps_grid_section_text_size)); + mSectionTextPaint.setColor(res.getColor(R.color.all_apps_grid_section_text_color)); + mSectionTextPaint.setAntiAlias(true); + + mPredictedAppsDividerPaint = new Paint(); + mPredictedAppsDividerPaint.setStrokeWidth(Utilities.pxFromDp(1f, res.getDisplayMetrics())); + mPredictedAppsDividerPaint.setColor(0x1E000000); + mPredictedAppsDividerPaint.setAntiAlias(true); + mPredictionBarDividerOffset = + (-res.getDimensionPixelSize(R.dimen.all_apps_prediction_icon_bottom_padding) + + res.getDimensionPixelSize(R.dimen.all_apps_icon_top_bottom_padding)) / 2; + } + + /** + * Sets the number of apps per row. + */ + public void setNumAppsPerRow(int appsPerRow) { + mAppsPerRow = appsPerRow; + mGridLayoutMgr.setSpanCount(appsPerRow); + } + + /** + * Sets whether we are in RTL mode. + */ + public void setRtl(boolean rtl) { + mIsRtl = rtl; + } + + /** + * Sets the text to show when there are no apps. + */ + public void setEmptySearchText(String query) { + mEmptySearchText = query; + } + + /** + * Notifies the adapter of the background padding so that it can draw things correctly in the + * item decorator. + */ + public void updateBackgroundPadding(Rect padding) { + mBackgroundPadding.set(padding); + } + + /** + * Returns the grid layout manager. + */ + public GridLayoutManager getLayoutManager() { + return mGridLayoutMgr; + } + + /** + * Returns the item decoration for the recycler view. + */ + public RecyclerView.ItemDecoration getItemDecoration() { + // We don't draw any headers when we are uncomfortably dense + return mItemDecoration; + } + + @Override + public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { + switch (viewType) { + case EMPTY_SEARCH_VIEW_TYPE: + return new ViewHolder(mLayoutInflater.inflate(R.layout.all_apps_empty_search, parent, + false)); + case SECTION_BREAK_VIEW_TYPE: + return new ViewHolder(new View(parent.getContext())); + case ICON_VIEW_TYPE: { + BubbleTextView icon = (BubbleTextView) mLayoutInflater.inflate( + R.layout.all_apps_icon, parent, false); + icon.setOnTouchListener(mTouchListener); + icon.setOnClickListener(mIconClickListener); + icon.setOnLongClickListener(mIconLongClickListener); + icon.setLongPressTimeout(ViewConfiguration.get(parent.getContext()) + .getLongPressTimeout()); + icon.setFocusable(true); + return new ViewHolder(icon); + } + case PREDICTION_ICON_VIEW_TYPE: { + BubbleTextView icon = (BubbleTextView) mLayoutInflater.inflate( + R.layout.all_apps_prediction_bar_icon, parent, false); + icon.setOnTouchListener(mTouchListener); + icon.setOnClickListener(mIconClickListener); + icon.setOnLongClickListener(mIconLongClickListener); + icon.setLongPressTimeout(ViewConfiguration.get(parent.getContext()) + .getLongPressTimeout()); + icon.setFocusable(true); + return new ViewHolder(icon); + } + default: + throw new RuntimeException("Unexpected view type"); + } + } + + @Override + public void onBindViewHolder(ViewHolder holder, int position) { + switch (holder.getItemViewType()) { + case ICON_VIEW_TYPE: { + AppInfo info = mApps.getAdapterItems().get(position).appInfo; + BubbleTextView icon = (BubbleTextView) holder.mContent; + icon.applyFromApplicationInfo(info); + break; + } + case PREDICTION_ICON_VIEW_TYPE: { + AppInfo info = mApps.getAdapterItems().get(position).appInfo; + BubbleTextView icon = (BubbleTextView) holder.mContent; + icon.applyFromApplicationInfo(info); + break; + } + case EMPTY_SEARCH_VIEW_TYPE: + TextView emptyViewText = (TextView) holder.mContent.findViewById(R.id.empty_text); + emptyViewText.setText(mEmptySearchText); + break; + } + } + + @Override + public int getItemCount() { + if (mApps.hasNoFilteredResults()) { + // For the empty view + return 1; + } + return mApps.getAdapterItems().size(); + } + + @Override + public int getItemViewType(int position) { + if (mApps.hasNoFilteredResults()) { + return EMPTY_SEARCH_VIEW_TYPE; + } + + AlphabeticalAppsList.AdapterItem item = mApps.getAdapterItems().get(position); + return item.viewType; + } +} |