DetailsOverviewRowPresenter.java revision 80d04d2265fe28800fcbc7e8cc7d6d229a7913d8
1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14package android.support.v17.leanback.widget; 15 16import android.content.Context; 17import android.graphics.Color; 18import android.support.v17.leanback.R; 19import android.support.v7.widget.RecyclerView; 20import android.util.Log; 21import android.util.TypedValue; 22import android.view.LayoutInflater; 23import android.view.View; 24import android.view.ViewGroup; 25import android.widget.FrameLayout; 26import android.widget.ImageView; 27 28import java.util.Collection; 29 30/** 31 * A DetailsOverviewRowPresenter renders a {@link DetailsOverviewRow} to display an 32 * overview of an item. Typically this row will be the first row in a fragment 33 * such as the {@link android.support.v17.leanback.app.DetailsFragment 34 * DetailsFragment}. 35 * 36 * <p>The detailed description is rendered using a {@link Presenter}. 37 */ 38public class DetailsOverviewRowPresenter extends RowPresenter { 39 40 private static final String TAG = "DetailsOverviewRowPresenter"; 41 private static final boolean DEBUG = false; 42 43 private static final int MORE_ACTIONS_FADE_MS = 100; 44 45 /** 46 * A ViewHolder for the DetailsOverviewRow. 47 */ 48 public static class ViewHolder extends RowPresenter.ViewHolder { 49 final ImageView mImageView; 50 final FrameLayout mDetailsDescriptionFrame; 51 final HorizontalGridView mActionsRow; 52 Presenter.ViewHolder mDetailsDescriptionViewHolder; 53 int mNumItems; 54 boolean mShowMoreRight; 55 boolean mShowMoreLeft; 56 57 void bind(ItemBridgeAdapter bridgeAdapter) { 58 mNumItems = bridgeAdapter.getItemCount(); 59 bridgeAdapter.setAdapterListener(mAdapterListener); 60 61 mShowMoreRight = false; 62 mShowMoreLeft = true; 63 showMoreLeft(false); 64 } 65 66 final ItemBridgeAdapter.AdapterListener mAdapterListener = 67 new ItemBridgeAdapter.AdapterListener() { 68 69 @Override 70 public void onAttachedToWindow(ItemBridgeAdapter.ViewHolder viewHolder) { 71 checkFirstAndLastPosition(false); 72 } 73 @Override 74 public void onDetachedFromWindow(ItemBridgeAdapter.ViewHolder viewHolder) { 75 checkFirstAndLastPosition(false); 76 } 77 }; 78 79 final RecyclerView.OnScrollListener mScrollListener = 80 new RecyclerView.OnScrollListener() { 81 82 @Override 83 public void onScrollStateChanged(int newState) { 84 } 85 @Override 86 public void onScrolled(int dx, int dy) { 87 checkFirstAndLastPosition(true); 88 } 89 }; 90 91 private int getViewCenter(View view) { 92 return (view.getRight() - view.getLeft()) / 2; 93 } 94 95 private void checkFirstAndLastPosition(boolean fromScroll) { 96 RecyclerView.ViewHolder viewHolder; 97 98 viewHolder = mActionsRow.findViewHolderForPosition(mNumItems - 1); 99 boolean showRight = (viewHolder == null || 100 viewHolder.itemView.getRight() > mActionsRow.getWidth()); 101 102 viewHolder = mActionsRow.findViewHolderForPosition(0); 103 boolean showLeft = (viewHolder == null || viewHolder.itemView.getLeft() < 0); 104 105 if (DEBUG) Log.v(TAG, "checkFirstAndLast fromScroll " + fromScroll + 106 " showRight " + showRight + " showLeft " + showLeft); 107 108 showMoreRight(showRight); 109 showMoreLeft(showLeft); 110 } 111 112 private void showMoreLeft(boolean show) { 113 if (show != mShowMoreLeft) { 114 mActionsRow.setFadingLeftEdge(show); 115 mShowMoreLeft = show; 116 } 117 } 118 119 private void showMoreRight(boolean show) { 120 if (show != mShowMoreRight) { 121 mActionsRow.setFadingRightEdge(show); 122 mShowMoreRight = show; 123 } 124 } 125 126 /** 127 * Constructor for the ViewHolder. 128 * 129 * @param rootView The root View that this view holder will be attached 130 * to. 131 */ 132 public ViewHolder(View rootView) { 133 super(rootView); 134 mImageView = (ImageView) rootView.findViewById(R.id.details_overview_image); 135 mDetailsDescriptionFrame = 136 (FrameLayout) rootView.findViewById(R.id.details_overview_description); 137 mActionsRow = 138 (HorizontalGridView) rootView.findViewById(R.id.details_overview_actions); 139 mActionsRow.setOnScrollListener(mScrollListener); 140 141 final int fadeLength = rootView.getResources().getDimensionPixelSize( 142 R.dimen.lb_details_overview_actions_fade_size); 143 mActionsRow.setFadingRightEdgeLength(fadeLength); 144 mActionsRow.setFadingLeftEdgeLength(fadeLength); 145 } 146 } 147 148 private final Presenter mDetailsPresenter; 149 private final ActionPresenterSelector mActionPresenterSelector; 150 private final ItemBridgeAdapter mActionBridgeAdapter; 151 private int mBackgroundColor = Color.TRANSPARENT; 152 private boolean mBackgroundColorSet; 153 private boolean mIsStyleLarge = true; 154 155 /** 156 * Constructor for a DetailsOverviewRowPresenter. 157 * 158 * @param detailsPresenter The {@link Presenter} used to render the detailed 159 * description of the row. 160 */ 161 public DetailsOverviewRowPresenter(Presenter detailsPresenter) { 162 setHeaderPresenter(null); 163 setSelectEffectEnabled(false); 164 mDetailsPresenter = detailsPresenter; 165 mActionPresenterSelector = new ActionPresenterSelector(); 166 mActionBridgeAdapter = new ItemBridgeAdapter(); 167 } 168 169 /** 170 * Sets the listener for Action click events. 171 */ 172 public void setOnActionClickedListener(OnActionClickedListener listener) { 173 mActionPresenterSelector.setOnActionClickedListener(listener); 174 } 175 176 /** 177 * Gets the listener for Action click events. 178 */ 179 public OnActionClickedListener getOnActionClickedListener() { 180 return mActionPresenterSelector.getOnActionClickedListener(); 181 } 182 183 /** 184 * Sets the background color. If not set, a default from the theme will be used. 185 */ 186 public void setBackgroundColor(int color) { 187 mBackgroundColor = color; 188 mBackgroundColorSet = true; 189 } 190 191 /** 192 * Returns the background color. If no background color was set, transparent 193 * is returned. 194 */ 195 public int getBackgroundColor() { 196 return mBackgroundColor; 197 } 198 199 /** 200 * Sets the layout style to be large or small. This affects the height of 201 * the overview, including the text description. The default is large. 202 */ 203 public void setStyleLarge(boolean large) { 204 mIsStyleLarge = large; 205 } 206 207 /** 208 * Returns true if the layout style is large. 209 */ 210 public boolean isStyleLarge() { 211 return mIsStyleLarge; 212 } 213 214 private int getDefaultBackgroundColor(Context context) { 215 TypedValue outValue = new TypedValue(); 216 context.getTheme().resolveAttribute(R.attr.defaultBrandColor, outValue, true); 217 return context.getResources().getColor(outValue.resourceId); 218 } 219 220 @Override 221 protected RowPresenter.ViewHolder createRowViewHolder(ViewGroup parent) { 222 View v = LayoutInflater.from(parent.getContext()) 223 .inflate(R.layout.lb_details_overview, parent, false); 224 ViewHolder vh = new ViewHolder(v); 225 226 vh.mDetailsDescriptionViewHolder = 227 mDetailsPresenter.onCreateViewHolder(vh.mDetailsDescriptionFrame); 228 vh.mDetailsDescriptionFrame.addView(vh.mDetailsDescriptionViewHolder.view); 229 230 initDetailsOverview(vh); 231 232 return vh; 233 } 234 235 private void initDetailsOverview(ViewHolder vh) { 236 int resId = mIsStyleLarge ? R.dimen.lb_details_overview_height_large : 237 R.dimen.lb_details_overview_height_small; 238 239 View overview = vh.view.findViewById(R.id.details_overview); 240 ViewGroup.LayoutParams lp = overview.getLayoutParams(); 241 lp.height = overview.getResources().getDimensionPixelSize(resId); 242 overview.setLayoutParams(lp); 243 244 overview.setBackgroundColor(mBackgroundColorSet ? 245 mBackgroundColor : getDefaultBackgroundColor(overview.getContext())); 246 247 // Max width to make a square 248 ImageView image = (ImageView) vh.view.findViewById(R.id.details_overview_image); 249 image.setMaxWidth(lp.height); 250 } 251 252 @Override 253 protected void onBindRowViewHolder(RowPresenter.ViewHolder holder, Object item) { 254 super.onBindRowViewHolder(holder, item); 255 256 DetailsOverviewRow row = (DetailsOverviewRow) item; 257 ViewHolder vh = (ViewHolder) holder; 258 if (row.getImageDrawable() != null) { 259 vh.mImageView.setImageDrawable(row.getImageDrawable()); 260 } 261 if (vh.mDetailsDescriptionViewHolder == null) { 262 } 263 mDetailsPresenter.onBindViewHolder(vh.mDetailsDescriptionViewHolder, row); 264 265 mActionBridgeAdapter.clear(); 266 ArrayObjectAdapter aoa = new ArrayObjectAdapter(mActionPresenterSelector); 267 aoa.addAll(0, (Collection)row.getActions()); 268 269 mActionBridgeAdapter.setAdapter(aoa); 270 vh.mActionsRow.setAdapter(mActionBridgeAdapter); 271 272 vh.bind(mActionBridgeAdapter); 273 } 274 275 @Override 276 protected void onUnbindRowViewHolder(RowPresenter.ViewHolder holder) { 277 super.onUnbindRowViewHolder(holder); 278 279 ViewHolder vh = (ViewHolder) holder; 280 if (vh.mDetailsDescriptionViewHolder != null) { 281 mDetailsPresenter.onUnbindViewHolder(vh.mDetailsDescriptionViewHolder); 282 } 283 284 vh.mActionsRow.setAdapter(null); 285 } 286} 287