Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package com.android.launcher3; |
| 17 | |
| 18 | import android.animation.ObjectAnimator; |
| 19 | import android.content.Context; |
| 20 | import android.content.res.Resources; |
| 21 | import android.graphics.Canvas; |
| 22 | import android.graphics.Color; |
| 23 | import android.graphics.Paint; |
| 24 | import android.graphics.Rect; |
| 25 | import android.graphics.drawable.Drawable; |
Winson Chung | 24cf700 | 2015-03-30 14:25:04 -0700 | [diff] [blame^] | 26 | import android.support.v7.widget.LinearLayoutManager; |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 27 | import android.support.v7.widget.RecyclerView; |
| 28 | import android.util.AttributeSet; |
| 29 | import android.view.MotionEvent; |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 30 | import android.view.View; |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 31 | import android.view.ViewConfiguration; |
| 32 | |
| 33 | import java.util.List; |
| 34 | |
| 35 | /** |
| 36 | * A RecyclerView with custom fastscroll support. This is the main container for the all apps |
| 37 | * icons. |
| 38 | */ |
| 39 | public class AppsContainerRecyclerView extends RecyclerView |
| 40 | implements RecyclerView.OnItemTouchListener { |
| 41 | |
Winson Chung | aa2ab25 | 2015-03-16 12:39:05 -0700 | [diff] [blame] | 42 | private static final float FAST_SCROLL_OVERLAY_Y_OFFSET_FACTOR = 1.5f; |
| 43 | |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 44 | private AlphabeticalAppsList mApps; |
| 45 | private int mNumAppsPerRow; |
| 46 | |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 47 | private Drawable mScrollbar; |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 48 | private Drawable mFastScrollerBg; |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 49 | private Rect mVerticalScrollbarBounds = new Rect(); |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 50 | private boolean mDraggingFastScroller; |
| 51 | private String mFastScrollSectionName; |
| 52 | private Paint mFastScrollTextPaint; |
| 53 | private Rect mFastScrollTextBounds = new Rect(); |
| 54 | private float mFastScrollAlpha; |
| 55 | private int mDownX; |
| 56 | private int mDownY; |
| 57 | private int mLastX; |
| 58 | private int mLastY; |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 59 | private int mScrollbarWidth; |
| 60 | private int mScrollbarMinHeight; |
| 61 | private int mScrollbarInset; |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 62 | |
| 63 | public AppsContainerRecyclerView(Context context) { |
| 64 | this(context, null); |
| 65 | } |
| 66 | |
| 67 | public AppsContainerRecyclerView(Context context, AttributeSet attrs) { |
| 68 | this(context, attrs, 0); |
| 69 | } |
| 70 | |
| 71 | public AppsContainerRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) { |
| 72 | this(context, attrs, defStyleAttr, 0); |
| 73 | } |
| 74 | |
| 75 | public AppsContainerRecyclerView(Context context, AttributeSet attrs, int defStyleAttr, |
| 76 | int defStyleRes) { |
| 77 | super(context, attrs, defStyleAttr); |
| 78 | |
| 79 | Resources res = context.getResources(); |
| 80 | int fastScrollerSize = res.getDimensionPixelSize(R.dimen.apps_view_fast_scroll_popup_size); |
Winson Chung | 3d9490a | 2015-03-24 17:38:42 -0700 | [diff] [blame] | 81 | mScrollbar = res.getDrawable(R.drawable.apps_list_scrollbar_thumb); |
| 82 | mFastScrollerBg = res.getDrawable(R.drawable.apps_list_fastscroll_bg); |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 83 | mFastScrollerBg.setBounds(0, 0, fastScrollerSize, fastScrollerSize); |
| 84 | mFastScrollTextPaint = new Paint(); |
| 85 | mFastScrollTextPaint.setColor(Color.WHITE); |
| 86 | mFastScrollTextPaint.setAntiAlias(true); |
| 87 | mFastScrollTextPaint.setTextSize(res.getDimensionPixelSize( |
| 88 | R.dimen.apps_view_fast_scroll_text_size)); |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 89 | mScrollbarWidth = res.getDimensionPixelSize(R.dimen.apps_view_fast_scroll_bar_width); |
| 90 | mScrollbarMinHeight = |
| 91 | res.getDimensionPixelSize(R.dimen.apps_view_fast_scroll_bar_min_height); |
| 92 | mScrollbarInset = |
| 93 | res.getDimensionPixelSize(R.dimen.apps_view_fast_scroll_scrubber_touch_inset); |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 94 | setFastScrollerAlpha(getFastScrollerAlpha()); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Sets the list of apps in this view, used to determine the fastscroll position. |
| 99 | */ |
| 100 | public void setApps(AlphabeticalAppsList apps) { |
| 101 | mApps = apps; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Sets the number of apps per row in this recycler view. |
| 106 | */ |
| 107 | public void setNumAppsPerRow(int rowSize) { |
| 108 | mNumAppsPerRow = rowSize; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Sets the fast scroller alpha. |
| 113 | */ |
| 114 | public void setFastScrollerAlpha(float alpha) { |
| 115 | mFastScrollAlpha = alpha; |
| 116 | invalidateFastScroller(); |
| 117 | } |
| 118 | |
| 119 | /** |
| 120 | * Gets the fast scroller alpha. |
| 121 | */ |
| 122 | public float getFastScrollerAlpha() { |
| 123 | return mFastScrollAlpha; |
| 124 | } |
| 125 | |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 126 | /** |
| 127 | * Returns the scroll bar width. |
| 128 | */ |
| 129 | public int getScrollbarWidth() { |
| 130 | return mScrollbarWidth; |
| 131 | } |
| 132 | |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 133 | @Override |
| 134 | protected void onFinishInflate() { |
| 135 | addOnItemTouchListener(this); |
| 136 | } |
| 137 | |
| 138 | @Override |
| 139 | protected void dispatchDraw(Canvas canvas) { |
| 140 | super.dispatchDraw(canvas); |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 141 | drawVerticalScrubber(canvas); |
| 142 | drawFastScrollerPopup(canvas); |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | /** |
| 146 | * We intercept the touch handling only to support fast scrolling when initiated from the |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 147 | * scroll bar. Otherwise, we fall back to the default RecyclerView touch handling. |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 148 | */ |
| 149 | @Override |
| 150 | public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent ev) { |
| 151 | return handleTouchEvent(ev); |
| 152 | } |
| 153 | |
| 154 | @Override |
| 155 | public void onTouchEvent(RecyclerView rv, MotionEvent ev) { |
| 156 | handleTouchEvent(ev); |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Handles the touch event and determines whether to show the fast scroller (or updates it if |
| 161 | * it is already showing). |
| 162 | */ |
| 163 | private boolean handleTouchEvent(MotionEvent ev) { |
| 164 | ViewConfiguration config = ViewConfiguration.get(getContext()); |
| 165 | |
| 166 | int action = ev.getAction(); |
| 167 | int x = (int) ev.getX(); |
| 168 | int y = (int) ev.getY(); |
| 169 | switch (action) { |
| 170 | case MotionEvent.ACTION_DOWN: |
| 171 | // Keep track of the down positions |
| 172 | mDownX = mLastX = x; |
| 173 | mDownY = mLastY = y; |
| 174 | stopScroll(); |
| 175 | break; |
| 176 | case MotionEvent.ACTION_MOVE: |
| 177 | // Check if we are scrolling |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 178 | if (!mDraggingFastScroller && isPointNearScrollbar(mDownX, mDownY) && |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 179 | Math.abs(y - mDownY) > config.getScaledTouchSlop()) { |
| 180 | getParent().requestDisallowInterceptTouchEvent(true); |
| 181 | mDraggingFastScroller = true; |
| 182 | animateFastScrollerVisibility(true); |
| 183 | } |
| 184 | if (mDraggingFastScroller) { |
| 185 | mLastX = x; |
| 186 | mLastY = y; |
| 187 | |
| 188 | // Scroll to the right position, and update the section name |
| 189 | int top = getPaddingTop() + (mFastScrollerBg.getBounds().height() / 2); |
| 190 | int bottom = getHeight() - getPaddingBottom() - |
| 191 | (mFastScrollerBg.getBounds().height() / 2); |
| 192 | float boundedY = (float) Math.max(top, Math.min(bottom, y)); |
| 193 | mFastScrollSectionName = scrollToPositionAtProgress((boundedY - top) / |
| 194 | (bottom - top)); |
| 195 | invalidateFastScroller(); |
| 196 | } |
| 197 | break; |
| 198 | case MotionEvent.ACTION_UP: |
| 199 | case MotionEvent.ACTION_CANCEL: |
| 200 | mDraggingFastScroller = false; |
| 201 | animateFastScrollerVisibility(false); |
| 202 | break; |
| 203 | } |
| 204 | return mDraggingFastScroller; |
| 205 | |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * Animates the visibility of the fast scroller popup. |
| 210 | */ |
| 211 | private void animateFastScrollerVisibility(boolean visible) { |
| 212 | ObjectAnimator anim = ObjectAnimator.ofFloat(this, "fastScrollerAlpha", visible ? 1f : 0f); |
| 213 | anim.setDuration(visible ? 200 : 150); |
| 214 | anim.start(); |
| 215 | } |
| 216 | |
| 217 | /** |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 218 | * Returns whether a given point is near the scrollbar. |
| 219 | */ |
| 220 | private boolean isPointNearScrollbar(int x, int y) { |
| 221 | // Check if we are scrolling |
| 222 | updateVerticalScrollbarBounds(); |
| 223 | mVerticalScrollbarBounds.inset(mScrollbarInset, mScrollbarInset); |
| 224 | return mVerticalScrollbarBounds.contains(x, y); |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Draws the fast scroller popup. |
| 229 | */ |
| 230 | private void drawFastScrollerPopup(Canvas canvas) { |
| 231 | int x; |
| 232 | int y; |
| 233 | boolean isRtl = (getResources().getConfiguration().getLayoutDirection() == |
| 234 | LAYOUT_DIRECTION_RTL); |
| 235 | |
| 236 | if (mFastScrollAlpha > 0f) { |
| 237 | // Calculate the position for the fast scroller popup |
| 238 | Rect bgBounds = mFastScrollerBg.getBounds(); |
| 239 | if (isRtl) { |
| 240 | x = getPaddingLeft() + getScrollBarSize(); |
| 241 | } else { |
| 242 | x = getWidth() - getPaddingRight() - getScrollBarSize() - bgBounds.width(); |
| 243 | } |
| 244 | y = mLastY - (int) (FAST_SCROLL_OVERLAY_Y_OFFSET_FACTOR * bgBounds.height()); |
| 245 | y = Math.max(getPaddingTop(), Math.min(y, getHeight() - getPaddingBottom() - |
| 246 | bgBounds.height())); |
| 247 | |
| 248 | // Draw the fast scroller popup |
| 249 | int restoreCount = canvas.save(Canvas.MATRIX_SAVE_FLAG); |
| 250 | canvas.translate(x, y); |
| 251 | mFastScrollerBg.setAlpha((int) (mFastScrollAlpha * 255)); |
| 252 | mFastScrollerBg.draw(canvas); |
| 253 | mFastScrollTextPaint.setAlpha((int) (mFastScrollAlpha * 255)); |
| 254 | mFastScrollTextPaint.getTextBounds(mFastScrollSectionName, 0, |
| 255 | mFastScrollSectionName.length(), mFastScrollTextBounds); |
| 256 | canvas.drawText(mFastScrollSectionName, |
| 257 | (bgBounds.width() - mFastScrollTextBounds.width()) / 2, |
| 258 | bgBounds.height() - (bgBounds.height() - mFastScrollTextBounds.height()) / 2, |
| 259 | mFastScrollTextPaint); |
| 260 | canvas.restoreToCount(restoreCount); |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | /** |
| 265 | * Draws the vertical scrollbar. |
| 266 | */ |
| 267 | private void drawVerticalScrubber(Canvas canvas) { |
| 268 | updateVerticalScrollbarBounds(); |
| 269 | |
| 270 | // Draw the scroll bar |
| 271 | int restoreCount = canvas.save(Canvas.MATRIX_SAVE_FLAG); |
| 272 | canvas.translate(mVerticalScrollbarBounds.left, mVerticalScrollbarBounds.top); |
| 273 | mScrollbar.setBounds(0, 0, mScrollbarWidth, mVerticalScrollbarBounds.height()); |
| 274 | mScrollbar.draw(canvas); |
| 275 | canvas.restoreToCount(restoreCount); |
| 276 | } |
| 277 | |
| 278 | /** |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 279 | * Invalidates the fast scroller popup. |
| 280 | */ |
| 281 | private void invalidateFastScroller() { |
| 282 | invalidate(getWidth() - getPaddingRight() - getScrollBarSize() - |
| 283 | mFastScrollerBg.getIntrinsicWidth(), 0, getWidth(), getHeight()); |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * Maps the progress (from 0..1) to the position that should be visible |
| 288 | */ |
| 289 | private String scrollToPositionAtProgress(float progress) { |
| 290 | List<AlphabeticalAppsList.SectionInfo> sections = mApps.getSections(); |
| 291 | // Get the total number of rows |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 292 | int rowCount = getNumRows(); |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 293 | |
Winson Chung | 24cf700 | 2015-03-30 14:25:04 -0700 | [diff] [blame^] | 294 | // Find the position of the first application in the section that contains the row at the |
| 295 | // current progress |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 296 | int rowAtProgress = (int) (progress * rowCount); |
| 297 | int appIndex = 0; |
| 298 | rowCount = 0; |
| 299 | for (AlphabeticalAppsList.SectionInfo info : sections) { |
| 300 | int numRowsInSection = (int) Math.ceil((float) info.numAppsInSection / mNumAppsPerRow); |
| 301 | if (rowCount + numRowsInSection > rowAtProgress) { |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 302 | break; |
| 303 | } |
| 304 | rowCount += numRowsInSection; |
| 305 | appIndex += info.numAppsInSection; |
| 306 | } |
| 307 | appIndex = Math.max(0, Math.min(mApps.getAppsWithoutSectionBreaks().size() - 1, appIndex)); |
| 308 | AppInfo appInfo = mApps.getAppsWithoutSectionBreaks().get(appIndex); |
| 309 | int sectionedAppIndex = mApps.getApps().indexOf(appInfo); |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 310 | |
Winson Chung | 24cf700 | 2015-03-30 14:25:04 -0700 | [diff] [blame^] | 311 | // Scroll the position into view, anchored at the top of the screen if possible. We call the |
| 312 | // scroll method on the LayoutManager directly since it is not exposed by RecyclerView. |
| 313 | LinearLayoutManager layoutManager = (LinearLayoutManager) getLayoutManager(); |
| 314 | stopScroll(); |
| 315 | layoutManager.scrollToPositionWithOffset(sectionedAppIndex, 0); |
| 316 | |
| 317 | // Return the section name of the row |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 318 | return mApps.getSectionNameForApp(appInfo); |
| 319 | } |
Winson Chung | f819dc2 | 2015-03-23 14:45:54 -0700 | [diff] [blame] | 320 | |
| 321 | /** |
| 322 | * Returns the bounds for the scrollbar. |
| 323 | */ |
| 324 | private void updateVerticalScrollbarBounds() { |
| 325 | int x; |
| 326 | int y; |
| 327 | boolean isRtl = (getResources().getConfiguration().getLayoutDirection() == |
| 328 | LAYOUT_DIRECTION_RTL); |
| 329 | |
| 330 | // Skip early if there are no items |
| 331 | if (mApps.getApps().isEmpty()) { |
| 332 | mVerticalScrollbarBounds.setEmpty(); |
| 333 | return; |
| 334 | } |
| 335 | |
| 336 | // Find the index and height of the first visible row (all rows have the same height) |
| 337 | int rowIndex = -1; |
| 338 | int rowTopOffset = -1; |
| 339 | int rowHeight = -1; |
| 340 | int rowCount = getNumRows(); |
| 341 | int childCount = getChildCount(); |
| 342 | for (int i = 0; i < childCount; i++) { |
| 343 | View child = getChildAt(i); |
| 344 | int position = getChildPosition(child); |
| 345 | if (position != NO_POSITION) { |
| 346 | AppInfo info = mApps.getApps().get(position); |
| 347 | if (info != AlphabeticalAppsList.SECTION_BREAK_INFO) { |
| 348 | int appIndex = mApps.getAppsWithoutSectionBreaks().indexOf(info); |
| 349 | rowIndex = findRowForAppIndex(appIndex); |
| 350 | rowTopOffset = getLayoutManager().getDecoratedTop(child); |
| 351 | rowHeight = child.getHeight(); |
| 352 | break; |
| 353 | } |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | if (rowIndex != -1) { |
| 358 | int height = getHeight() - getPaddingTop() - getPaddingBottom(); |
| 359 | int totalScrollHeight = rowCount * rowHeight; |
| 360 | if (totalScrollHeight > height) { |
| 361 | int scrollbarHeight = Math.max(mScrollbarMinHeight, |
| 362 | (int) (height / ((float) totalScrollHeight / height))); |
| 363 | |
| 364 | // Calculate the position and size of the scroll bar |
| 365 | if (isRtl) { |
| 366 | x = getPaddingLeft(); |
| 367 | } else { |
| 368 | x = getWidth() - getPaddingRight() - mScrollbarWidth; |
| 369 | } |
| 370 | |
| 371 | // To calculate the offset, we compute the percentage of the total scrollable height |
| 372 | // that the user has already scrolled and then map that to the scroll bar bounds |
| 373 | int availableY = totalScrollHeight - height; |
| 374 | int availableScrollY = height - scrollbarHeight; |
| 375 | y = (rowIndex * rowHeight) - rowTopOffset; |
| 376 | y = getPaddingTop() + |
| 377 | (int) (((float) (getPaddingTop() + y) / availableY) * availableScrollY); |
| 378 | |
| 379 | mVerticalScrollbarBounds.set(x, y, x + mScrollbarWidth, y + scrollbarHeight); |
| 380 | return; |
| 381 | } |
| 382 | } |
| 383 | mVerticalScrollbarBounds.setEmpty(); |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * Returns the row index for a given position in the list. |
| 388 | */ |
| 389 | private int findRowForAppIndex(int position) { |
| 390 | List<AlphabeticalAppsList.SectionInfo> sections = mApps.getSections(); |
| 391 | int appIndex = 0; |
| 392 | int rowCount = 0; |
| 393 | for (AlphabeticalAppsList.SectionInfo info : sections) { |
| 394 | int numRowsInSection = (int) Math.ceil((float) info.numAppsInSection / mNumAppsPerRow); |
| 395 | if (appIndex + info.numAppsInSection > position) { |
| 396 | return rowCount + ((position - appIndex) / mNumAppsPerRow); |
| 397 | } |
| 398 | appIndex += info.numAppsInSection; |
| 399 | rowCount += numRowsInSection; |
| 400 | } |
| 401 | return appIndex; |
| 402 | } |
| 403 | |
| 404 | /** |
| 405 | * Returns the total number of rows in the list. |
| 406 | */ |
| 407 | private int getNumRows() { |
| 408 | List<AlphabeticalAppsList.SectionInfo> sections = mApps.getSections(); |
| 409 | int rowCount = 0; |
| 410 | for (AlphabeticalAppsList.SectionInfo info : sections) { |
| 411 | int numRowsInSection = (int) Math.ceil((float) info.numAppsInSection / mNumAppsPerRow); |
| 412 | rowCount += numRowsInSection; |
| 413 | } |
| 414 | return rowCount; |
| 415 | } |
Winson Chung | 93f98ea | 2015-03-10 16:28:47 -0700 | [diff] [blame] | 416 | } |