DetailsOverviewRowPresenter.java revision b34a2372153298ebdc3e148e1c1f3b3924efab08
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.Bitmap; 18import android.graphics.Color; 19import android.graphics.drawable.BitmapDrawable; 20import android.support.v17.leanback.R; 21import android.support.v7.widget.RecyclerView; 22import android.util.Log; 23import android.util.TypedValue; 24import android.view.LayoutInflater; 25import android.view.View; 26import android.view.ViewGroup; 27import android.widget.FrameLayout; 28import android.widget.ImageView; 29 30import java.util.Collection; 31 32/** 33 * A DetailsOverviewRowPresenter renders a {@link DetailsOverviewRow} to display an 34 * overview of an item. Typically this row will be the first row in a fragment 35 * such as the {@link android.support.v17.leanback.app.DetailsFragment 36 * DetailsFragment}. 37 * 38 * <p>The detailed description is rendered using a {@link Presenter}. 39 */ 40public class DetailsOverviewRowPresenter extends RowPresenter { 41 42 private static final String TAG = "DetailsOverviewRowPresenter"; 43 private static final boolean DEBUG = false; 44 45 private static final int MORE_ACTIONS_FADE_MS = 100; 46 47 /** 48 * A ViewHolder for the DetailsOverviewRow. 49 */ 50 public static class ViewHolder extends RowPresenter.ViewHolder { 51 final ViewGroup mOverviewView; 52 final ImageView mImageView; 53 final FrameLayout mDetailsDescriptionFrame; 54 final HorizontalGridView mActionsRow; 55 Presenter.ViewHolder mDetailsDescriptionViewHolder; 56 int mNumItems; 57 boolean mShowMoreRight; 58 boolean mShowMoreLeft; 59 60 void bind(ItemBridgeAdapter bridgeAdapter) { 61 mNumItems = bridgeAdapter.getItemCount(); 62 bridgeAdapter.setAdapterListener(mAdapterListener); 63 64 mShowMoreRight = false; 65 mShowMoreLeft = true; 66 showMoreLeft(false); 67 } 68 69 final View.OnLayoutChangeListener mLayoutChangeListener = 70 new View.OnLayoutChangeListener() { 71 72 @Override 73 public void onLayoutChange(View v, int left, int top, int right, 74 int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) { 75 if (DEBUG) Log.v(TAG, "onLayoutChange " + v); 76 checkFirstAndLastPosition(false); 77 } 78 }; 79 80 final ItemBridgeAdapter.AdapterListener mAdapterListener = 81 new ItemBridgeAdapter.AdapterListener() { 82 83 @Override 84 public void onAttachedToWindow(ItemBridgeAdapter.ViewHolder viewHolder) { 85 // Remove first to ensure we don't add ourselves more than once. 86 viewHolder.itemView.removeOnLayoutChangeListener(mLayoutChangeListener); 87 viewHolder.itemView.addOnLayoutChangeListener(mLayoutChangeListener); 88 } 89 @Override 90 public void onDetachedFromWindow(ItemBridgeAdapter.ViewHolder viewHolder) { 91 viewHolder.itemView.removeOnLayoutChangeListener(mLayoutChangeListener); 92 checkFirstAndLastPosition(false); 93 } 94 }; 95 96 final RecyclerView.OnScrollListener mScrollListener = 97 new RecyclerView.OnScrollListener() { 98 99 @Override 100 public void onScrollStateChanged(int newState) { 101 } 102 @Override 103 public void onScrolled(int dx, int dy) { 104 checkFirstAndLastPosition(true); 105 } 106 }; 107 108 private int getViewCenter(View view) { 109 return (view.getRight() - view.getLeft()) / 2; 110 } 111 112 private void checkFirstAndLastPosition(boolean fromScroll) { 113 RecyclerView.ViewHolder viewHolder; 114 115 viewHolder = mActionsRow.findViewHolderForPosition(mNumItems - 1); 116 boolean showRight = (viewHolder == null || 117 viewHolder.itemView.getRight() > mActionsRow.getWidth()); 118 119 viewHolder = mActionsRow.findViewHolderForPosition(0); 120 boolean showLeft = (viewHolder == null || viewHolder.itemView.getLeft() < 0); 121 122 if (DEBUG) Log.v(TAG, "checkFirstAndLast fromScroll " + fromScroll + 123 " showRight " + showRight + " showLeft " + showLeft); 124 125 showMoreRight(showRight); 126 showMoreLeft(showLeft); 127 } 128 129 private void showMoreLeft(boolean show) { 130 if (show != mShowMoreLeft) { 131 mActionsRow.setFadingLeftEdge(show); 132 mShowMoreLeft = show; 133 } 134 } 135 136 private void showMoreRight(boolean show) { 137 if (show != mShowMoreRight) { 138 mActionsRow.setFadingRightEdge(show); 139 mShowMoreRight = show; 140 } 141 } 142 143 /** 144 * Constructor for the ViewHolder. 145 * 146 * @param rootView The root View that this view holder will be attached 147 * to. 148 */ 149 public ViewHolder(View rootView) { 150 super(rootView); 151 mOverviewView = (ViewGroup) rootView.findViewById(R.id.details_overview); 152 mImageView = (ImageView) rootView.findViewById(R.id.details_overview_image); 153 mDetailsDescriptionFrame = 154 (FrameLayout) rootView.findViewById(R.id.details_overview_description); 155 mActionsRow = 156 (HorizontalGridView) rootView.findViewById(R.id.details_overview_actions); 157 mActionsRow.setOnScrollListener(mScrollListener); 158 159 final int fadeLength = rootView.getResources().getDimensionPixelSize( 160 R.dimen.lb_details_overview_actions_fade_size); 161 mActionsRow.setFadingRightEdgeLength(fadeLength); 162 mActionsRow.setFadingLeftEdgeLength(fadeLength); 163 } 164 } 165 166 private final Presenter mDetailsPresenter; 167 private final ActionPresenterSelector mActionPresenterSelector; 168 private final ItemBridgeAdapter mActionBridgeAdapter; 169 private int mBackgroundColor = Color.TRANSPARENT; 170 private boolean mBackgroundColorSet; 171 private boolean mIsStyleLarge = true; 172 173 /** 174 * Constructor for a DetailsOverviewRowPresenter. 175 * 176 * @param detailsPresenter The {@link Presenter} used to render the detailed 177 * description of the row. 178 */ 179 public DetailsOverviewRowPresenter(Presenter detailsPresenter) { 180 setHeaderPresenter(null); 181 setSelectEffectEnabled(false); 182 mDetailsPresenter = detailsPresenter; 183 mActionPresenterSelector = new ActionPresenterSelector(); 184 mActionBridgeAdapter = new ItemBridgeAdapter(); 185 } 186 187 /** 188 * Sets the listener for Action click events. 189 */ 190 public void setOnActionClickedListener(OnActionClickedListener listener) { 191 mActionPresenterSelector.setOnActionClickedListener(listener); 192 } 193 194 /** 195 * Gets the listener for Action click events. 196 */ 197 public OnActionClickedListener getOnActionClickedListener() { 198 return mActionPresenterSelector.getOnActionClickedListener(); 199 } 200 201 /** 202 * Sets the background color. If not set, a default from the theme will be used. 203 */ 204 public void setBackgroundColor(int color) { 205 mBackgroundColor = color; 206 mBackgroundColorSet = true; 207 } 208 209 /** 210 * Returns the background color. If no background color was set, transparent 211 * is returned. 212 */ 213 public int getBackgroundColor() { 214 return mBackgroundColor; 215 } 216 217 /** 218 * Sets the layout style to be large or small. This affects the height of 219 * the overview, including the text description. The default is large. 220 */ 221 public void setStyleLarge(boolean large) { 222 mIsStyleLarge = large; 223 } 224 225 /** 226 * Returns true if the layout style is large. 227 */ 228 public boolean isStyleLarge() { 229 return mIsStyleLarge; 230 } 231 232 /** 233 * Get overview view with background color. 234 */ 235 public ViewGroup getOverviewView(ViewHolder holder) { 236 return holder.mOverviewView; 237 } 238 239 private int getDefaultBackgroundColor(Context context) { 240 TypedValue outValue = new TypedValue(); 241 context.getTheme().resolveAttribute(R.attr.defaultBrandColor, outValue, true); 242 return context.getResources().getColor(outValue.resourceId); 243 } 244 245 @Override 246 protected RowPresenter.ViewHolder createRowViewHolder(ViewGroup parent) { 247 View v = LayoutInflater.from(parent.getContext()) 248 .inflate(R.layout.lb_details_overview, parent, false); 249 ViewHolder vh = new ViewHolder(v); 250 251 vh.mDetailsDescriptionViewHolder = 252 mDetailsPresenter.onCreateViewHolder(vh.mDetailsDescriptionFrame); 253 vh.mDetailsDescriptionFrame.addView(vh.mDetailsDescriptionViewHolder.view); 254 255 initDetailsOverview(vh); 256 257 return vh; 258 } 259 260 private int getCardHeight(Context context) { 261 int resId = mIsStyleLarge ? R.dimen.lb_details_overview_height_large : 262 R.dimen.lb_details_overview_height_small; 263 return context.getResources().getDimensionPixelSize(resId); 264 } 265 266 private void initDetailsOverview(ViewHolder vh) { 267 View overview = vh.view.findViewById(R.id.details_overview); 268 ViewGroup.LayoutParams lp = overview.getLayoutParams(); 269 lp.height = getCardHeight(overview.getContext()); 270 overview.setLayoutParams(lp); 271 272 overview.setBackgroundColor(mBackgroundColorSet ? 273 mBackgroundColor : getDefaultBackgroundColor(overview.getContext())); 274 ShadowHelper.getInstance().setZ(overview, 0f); 275 } 276 277 @Override 278 protected void onBindRowViewHolder(RowPresenter.ViewHolder holder, Object item) { 279 super.onBindRowViewHolder(holder, item); 280 281 DetailsOverviewRow row = (DetailsOverviewRow) item; 282 ViewHolder vh = (ViewHolder) holder; 283 284 ViewGroup.MarginLayoutParams layoutParams = 285 (ViewGroup.MarginLayoutParams) vh.mImageView.getLayoutParams(); 286 final int cardHeight = getCardHeight(vh.mImageView.getContext()); 287 final int verticalMargin = vh.mImageView.getResources().getDimensionPixelSize( 288 R.dimen.lb_details_overview_image_margin_vertical); 289 final int horizontalMargin = vh.mImageView.getResources().getDimensionPixelSize( 290 R.dimen.lb_details_overview_image_margin_horizontal); 291 boolean scaleImage = row.isImageScaleUpAllowed(); 292 boolean useMargin = false; 293 boolean landscape = false; 294 295 // If large style and landscape image we always use margin. 296 if (row.getImageDrawable().getIntrinsicWidth() > 297 row.getImageDrawable().getIntrinsicHeight()) { 298 landscape = true; 299 if (mIsStyleLarge) { 300 useMargin = true; 301 } 302 } 303 // If long dimension bigger than the card height we scale down. 304 if ((landscape && row.getImageDrawable().getIntrinsicWidth() > cardHeight) || 305 (!landscape && row.getImageDrawable().getIntrinsicHeight() > cardHeight)) { 306 scaleImage = true; 307 } 308 // If we're not scaling to fit the card height then we always use margin. 309 if (!scaleImage) { 310 useMargin = true; 311 } 312 // If using margin than may need to scale down. 313 if (useMargin && !scaleImage) { 314 if (landscape && row.getImageDrawable().getIntrinsicWidth() > 315 cardHeight - horizontalMargin) { 316 scaleImage = true; 317 } else if (!landscape && row.getImageDrawable().getIntrinsicHeight() > 318 cardHeight - 2 * verticalMargin) { 319 scaleImage = true; 320 } 321 } 322 323 if (useMargin) { 324 layoutParams.leftMargin = horizontalMargin; 325 layoutParams.topMargin = layoutParams.bottomMargin = verticalMargin; 326 } else { 327 layoutParams.leftMargin = layoutParams.topMargin = layoutParams.bottomMargin = 0; 328 } 329 if (scaleImage) { 330 vh.mImageView.setScaleType(ImageView.ScaleType.FIT_START); 331 vh.mImageView.setAdjustViewBounds(true); 332 vh.mImageView.setMaxWidth(cardHeight); 333 layoutParams.height = ViewGroup.LayoutParams.MATCH_PARENT; 334 layoutParams.width = ViewGroup.LayoutParams.WRAP_CONTENT; 335 } else { 336 vh.mImageView.setScaleType(ImageView.ScaleType.CENTER); 337 vh.mImageView.setAdjustViewBounds(false); 338 layoutParams.height = ViewGroup.LayoutParams.WRAP_CONTENT; 339 // Limit width to the card height 340 layoutParams.width = Math.min(cardHeight, row.getImageDrawable().getIntrinsicWidth()); 341 } 342 vh.mImageView.setLayoutParams(layoutParams); 343 vh.mImageView.setImageDrawable(row.getImageDrawable()); 344 345 mDetailsPresenter.onBindViewHolder(vh.mDetailsDescriptionViewHolder, row); 346 347 mActionBridgeAdapter.clear(); 348 ArrayObjectAdapter aoa = new ArrayObjectAdapter(mActionPresenterSelector); 349 aoa.addAll(0, (Collection)row.getActions()); 350 351 mActionBridgeAdapter.setAdapter(aoa); 352 vh.mActionsRow.setAdapter(mActionBridgeAdapter); 353 354 vh.bind(mActionBridgeAdapter); 355 } 356 357 @Override 358 protected void onUnbindRowViewHolder(RowPresenter.ViewHolder holder) { 359 super.onUnbindRowViewHolder(holder); 360 361 ViewHolder vh = (ViewHolder) holder; 362 if (vh.mDetailsDescriptionViewHolder != null) { 363 mDetailsPresenter.onUnbindViewHolder(vh.mDetailsDescriptionViewHolder); 364 } 365 366 vh.mActionsRow.setAdapter(null); 367 } 368} 369