Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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 | |
Gary Mai | 69c182a | 2016-12-05 13:07:03 -0800 | [diff] [blame] | 17 | package com.android.contacts.list; |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 18 | |
| 19 | import android.content.Context; |
| 20 | import android.graphics.Canvas; |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 21 | import android.graphics.RectF; |
| 22 | import android.util.AttributeSet; |
| 23 | import android.view.MotionEvent; |
| 24 | import android.view.View; |
| 25 | import android.view.ViewGroup; |
| 26 | import android.widget.AbsListView; |
| 27 | import android.widget.AbsListView.OnScrollListener; |
| 28 | import android.widget.AdapterView; |
| 29 | import android.widget.AdapterView.OnItemSelectedListener; |
| 30 | import android.widget.ListAdapter; |
Wenyi Wang | d5403fa | 2016-07-20 17:16:38 -0700 | [diff] [blame] | 31 | import android.widget.TextView; |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 32 | |
Gary Mai | 69c182a | 2016-12-05 13:07:03 -0800 | [diff] [blame] | 33 | import com.android.contacts.util.ViewUtil; |
Yorke Lee | 50a89a5 | 2013-11-04 14:44:30 -0800 | [diff] [blame] | 34 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 35 | /** |
| 36 | * A ListView that maintains a header pinned at the top of the list. The |
| 37 | * pinned header can be pushed up and dissolved as needed. |
| 38 | */ |
| 39 | public class PinnedHeaderListView extends AutoScrollListView |
| 40 | implements OnScrollListener, OnItemSelectedListener { |
| 41 | |
| 42 | /** |
| 43 | * Adapter interface. The list adapter must implement this interface. |
| 44 | */ |
| 45 | public interface PinnedHeaderAdapter { |
| 46 | |
| 47 | /** |
| 48 | * Returns the overall number of pinned headers, visible or not. |
| 49 | */ |
| 50 | int getPinnedHeaderCount(); |
| 51 | |
| 52 | /** |
| 53 | * Creates or updates the pinned header view. |
| 54 | */ |
| 55 | View getPinnedHeaderView(int viewIndex, View convertView, ViewGroup parent); |
| 56 | |
| 57 | /** |
| 58 | * Configures the pinned headers to match the visible list items. The |
| 59 | * adapter should call {@link PinnedHeaderListView#setHeaderPinnedAtTop}, |
| 60 | * {@link PinnedHeaderListView#setHeaderPinnedAtBottom}, |
| 61 | * {@link PinnedHeaderListView#setFadingHeader} or |
| 62 | * {@link PinnedHeaderListView#setHeaderInvisible}, for each header that |
| 63 | * needs to change its position or visibility. |
| 64 | */ |
| 65 | void configurePinnedHeaders(PinnedHeaderListView listView); |
| 66 | |
| 67 | /** |
| 68 | * Returns the list position to scroll to if the pinned header is touched. |
| 69 | * Return -1 if the list does not need to be scrolled. |
| 70 | */ |
| 71 | int getScrollPositionForHeader(int viewIndex); |
| 72 | } |
| 73 | |
| 74 | private static final int MAX_ALPHA = 255; |
| 75 | private static final int TOP = 0; |
| 76 | private static final int BOTTOM = 1; |
| 77 | private static final int FADING = 2; |
| 78 | |
| 79 | private static final int DEFAULT_ANIMATION_DURATION = 20; |
| 80 | |
Yorke Lee | fbae837 | 2013-10-01 09:17:08 -0700 | [diff] [blame] | 81 | private static final int DEFAULT_SMOOTH_SCROLL_DURATION = 100; |
| 82 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 83 | private static final class PinnedHeader { |
| 84 | View view; |
| 85 | boolean visible; |
| 86 | int y; |
| 87 | int height; |
| 88 | int alpha; |
| 89 | int state; |
| 90 | |
| 91 | boolean animating; |
| 92 | boolean targetVisible; |
| 93 | int sourceY; |
| 94 | int targetY; |
| 95 | long targetTime; |
| 96 | } |
| 97 | |
| 98 | private PinnedHeaderAdapter mAdapter; |
| 99 | private int mSize; |
| 100 | private PinnedHeader[] mHeaders; |
| 101 | private RectF mBounds = new RectF(); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 102 | private OnScrollListener mOnScrollListener; |
| 103 | private OnItemSelectedListener mOnItemSelectedListener; |
| 104 | private int mScrollState; |
| 105 | |
Yorke Lee | fbae837 | 2013-10-01 09:17:08 -0700 | [diff] [blame] | 106 | private boolean mScrollToSectionOnHeaderTouch = false; |
| 107 | private boolean mHeaderTouched = false; |
| 108 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 109 | private int mAnimationDuration = DEFAULT_ANIMATION_DURATION; |
| 110 | private boolean mAnimating; |
| 111 | private long mAnimationTargetTime; |
Fabrice Di Meglio | 29a5cf9 | 2013-04-03 20:59:09 -0700 | [diff] [blame] | 112 | private int mHeaderPaddingStart; |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 113 | private int mHeaderWidth; |
| 114 | |
| 115 | public PinnedHeaderListView(Context context) { |
Yorke Lee | 9f2769d | 2013-10-16 10:07:24 -0700 | [diff] [blame] | 116 | this(context, null, android.R.attr.listViewStyle); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | public PinnedHeaderListView(Context context, AttributeSet attrs) { |
Yorke Lee | 9f2769d | 2013-10-16 10:07:24 -0700 | [diff] [blame] | 120 | this(context, attrs, android.R.attr.listViewStyle); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | public PinnedHeaderListView(Context context, AttributeSet attrs, int defStyle) { |
| 124 | super(context, attrs, defStyle); |
| 125 | super.setOnScrollListener(this); |
| 126 | super.setOnItemSelectedListener(this); |
| 127 | } |
| 128 | |
| 129 | @Override |
| 130 | protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| 131 | super.onLayout(changed, l, t, r, b); |
Fabrice Di Meglio | 29a5cf9 | 2013-04-03 20:59:09 -0700 | [diff] [blame] | 132 | mHeaderPaddingStart = getPaddingStart(); |
| 133 | mHeaderWidth = r - l - mHeaderPaddingStart - getPaddingEnd(); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 136 | @Override |
| 137 | public void setAdapter(ListAdapter adapter) { |
| 138 | mAdapter = (PinnedHeaderAdapter)adapter; |
| 139 | super.setAdapter(adapter); |
| 140 | } |
| 141 | |
| 142 | @Override |
| 143 | public void setOnScrollListener(OnScrollListener onScrollListener) { |
| 144 | mOnScrollListener = onScrollListener; |
| 145 | super.setOnScrollListener(this); |
| 146 | } |
| 147 | |
| 148 | @Override |
| 149 | public void setOnItemSelectedListener(OnItemSelectedListener listener) { |
| 150 | mOnItemSelectedListener = listener; |
| 151 | super.setOnItemSelectedListener(this); |
| 152 | } |
| 153 | |
Yorke Lee | fbae837 | 2013-10-01 09:17:08 -0700 | [diff] [blame] | 154 | public void setScrollToSectionOnHeaderTouch(boolean value) { |
| 155 | mScrollToSectionOnHeaderTouch = value; |
| 156 | } |
| 157 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 158 | @Override |
| 159 | public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, |
| 160 | int totalItemCount) { |
| 161 | if (mAdapter != null) { |
| 162 | int count = mAdapter.getPinnedHeaderCount(); |
| 163 | if (count != mSize) { |
| 164 | mSize = count; |
| 165 | if (mHeaders == null) { |
| 166 | mHeaders = new PinnedHeader[mSize]; |
| 167 | } else if (mHeaders.length < mSize) { |
| 168 | PinnedHeader[] headers = mHeaders; |
| 169 | mHeaders = new PinnedHeader[mSize]; |
| 170 | System.arraycopy(headers, 0, mHeaders, 0, headers.length); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | for (int i = 0; i < mSize; i++) { |
| 175 | if (mHeaders[i] == null) { |
| 176 | mHeaders[i] = new PinnedHeader(); |
| 177 | } |
| 178 | mHeaders[i].view = mAdapter.getPinnedHeaderView(i, mHeaders[i].view, this); |
| 179 | } |
| 180 | |
| 181 | mAnimationTargetTime = System.currentTimeMillis() + mAnimationDuration; |
| 182 | mAdapter.configurePinnedHeaders(this); |
| 183 | invalidateIfAnimating(); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 184 | } |
| 185 | if (mOnScrollListener != null) { |
| 186 | mOnScrollListener.onScroll(this, firstVisibleItem, visibleItemCount, totalItemCount); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | @Override |
| 191 | protected float getTopFadingEdgeStrength() { |
| 192 | // Disable vertical fading at the top when the pinned header is present |
| 193 | return mSize > 0 ? 0 : super.getTopFadingEdgeStrength(); |
| 194 | } |
| 195 | |
| 196 | @Override |
| 197 | public void onScrollStateChanged(AbsListView view, int scrollState) { |
| 198 | mScrollState = scrollState; |
| 199 | if (mOnScrollListener != null) { |
| 200 | mOnScrollListener.onScrollStateChanged(this, scrollState); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * Ensures that the selected item is positioned below the top-pinned headers |
| 206 | * and above the bottom-pinned ones. |
| 207 | */ |
| 208 | @Override |
| 209 | public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { |
| 210 | int height = getHeight(); |
| 211 | |
| 212 | int windowTop = 0; |
| 213 | int windowBottom = height; |
| 214 | |
| 215 | for (int i = 0; i < mSize; i++) { |
| 216 | PinnedHeader header = mHeaders[i]; |
| 217 | if (header.visible) { |
| 218 | if (header.state == TOP) { |
| 219 | windowTop = header.y + header.height; |
| 220 | } else if (header.state == BOTTOM) { |
| 221 | windowBottom = header.y; |
| 222 | break; |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | View selectedView = getSelectedView(); |
| 228 | if (selectedView != null) { |
| 229 | if (selectedView.getTop() < windowTop) { |
| 230 | setSelectionFromTop(position, windowTop); |
| 231 | } else if (selectedView.getBottom() > windowBottom) { |
| 232 | setSelectionFromTop(position, windowBottom - selectedView.getHeight()); |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | if (mOnItemSelectedListener != null) { |
| 237 | mOnItemSelectedListener.onItemSelected(parent, view, position, id); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | @Override |
| 242 | public void onNothingSelected(AdapterView<?> parent) { |
| 243 | if (mOnItemSelectedListener != null) { |
| 244 | mOnItemSelectedListener.onNothingSelected(parent); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | public int getPinnedHeaderHeight(int viewIndex) { |
| 249 | ensurePinnedHeaderLayout(viewIndex); |
| 250 | return mHeaders[viewIndex].view.getHeight(); |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Set header to be pinned at the top. |
| 255 | * |
| 256 | * @param viewIndex index of the header view |
| 257 | * @param y is position of the header in pixels. |
| 258 | * @param animate true if the transition to the new coordinate should be animated |
| 259 | */ |
| 260 | public void setHeaderPinnedAtTop(int viewIndex, int y, boolean animate) { |
| 261 | ensurePinnedHeaderLayout(viewIndex); |
| 262 | PinnedHeader header = mHeaders[viewIndex]; |
| 263 | header.visible = true; |
| 264 | header.y = y; |
| 265 | header.state = TOP; |
| 266 | |
| 267 | // TODO perhaps we should animate at the top as well |
| 268 | header.animating = false; |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Set header to be pinned at the bottom. |
| 273 | * |
| 274 | * @param viewIndex index of the header view |
| 275 | * @param y is position of the header in pixels. |
| 276 | * @param animate true if the transition to the new coordinate should be animated |
| 277 | */ |
| 278 | public void setHeaderPinnedAtBottom(int viewIndex, int y, boolean animate) { |
| 279 | ensurePinnedHeaderLayout(viewIndex); |
| 280 | PinnedHeader header = mHeaders[viewIndex]; |
| 281 | header.state = BOTTOM; |
| 282 | if (header.animating) { |
| 283 | header.targetTime = mAnimationTargetTime; |
| 284 | header.sourceY = header.y; |
| 285 | header.targetY = y; |
| 286 | } else if (animate && (header.y != y || !header.visible)) { |
| 287 | if (header.visible) { |
| 288 | header.sourceY = header.y; |
| 289 | } else { |
| 290 | header.visible = true; |
| 291 | header.sourceY = y + header.height; |
| 292 | } |
| 293 | header.animating = true; |
| 294 | header.targetVisible = true; |
| 295 | header.targetTime = mAnimationTargetTime; |
| 296 | header.targetY = y; |
| 297 | } else { |
| 298 | header.visible = true; |
| 299 | header.y = y; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * Set header to be pinned at the top of the first visible item. |
| 305 | * |
| 306 | * @param viewIndex index of the header view |
| 307 | * @param position is position of the header in pixels. |
| 308 | */ |
| 309 | public void setFadingHeader(int viewIndex, int position, boolean fade) { |
| 310 | ensurePinnedHeaderLayout(viewIndex); |
| 311 | |
| 312 | View child = getChildAt(position - getFirstVisiblePosition()); |
| 313 | if (child == null) return; |
| 314 | |
| 315 | PinnedHeader header = mHeaders[viewIndex]; |
Wenyi Wang | d5403fa | 2016-07-20 17:16:38 -0700 | [diff] [blame] | 316 | // Hide header when it's a star. |
| 317 | // TODO: try showing the view even when it's a star; |
| 318 | // if we have to hide the star view, then try hiding it in some higher layer. |
John Shao | da18871 | 2016-08-19 14:57:11 -0700 | [diff] [blame] | 319 | header.visible = !((TextView) header.view).getText().toString().isEmpty(); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 320 | header.state = FADING; |
| 321 | header.alpha = MAX_ALPHA; |
| 322 | header.animating = false; |
| 323 | |
| 324 | int top = getTotalTopPinnedHeaderHeight(); |
| 325 | header.y = top; |
| 326 | if (fade) { |
| 327 | int bottom = child.getBottom() - top; |
| 328 | int headerHeight = header.height; |
| 329 | if (bottom < headerHeight) { |
| 330 | int portion = bottom - headerHeight; |
| 331 | header.alpha = MAX_ALPHA * (headerHeight + portion) / headerHeight; |
| 332 | header.y = top + portion; |
| 333 | } |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * Makes header invisible. |
| 339 | * |
| 340 | * @param viewIndex index of the header view |
| 341 | * @param animate true if the transition to the new coordinate should be animated |
| 342 | */ |
| 343 | public void setHeaderInvisible(int viewIndex, boolean animate) { |
| 344 | PinnedHeader header = mHeaders[viewIndex]; |
| 345 | if (header.visible && (animate || header.animating) && header.state == BOTTOM) { |
| 346 | header.sourceY = header.y; |
| 347 | if (!header.animating) { |
| 348 | header.visible = true; |
| 349 | header.targetY = getBottom() + header.height; |
| 350 | } |
| 351 | header.animating = true; |
| 352 | header.targetTime = mAnimationTargetTime; |
| 353 | header.targetVisible = false; |
| 354 | } else { |
| 355 | header.visible = false; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | private void ensurePinnedHeaderLayout(int viewIndex) { |
| 360 | View view = mHeaders[viewIndex].view; |
| 361 | if (view.isLayoutRequested()) { |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 362 | ViewGroup.LayoutParams layoutParams = view.getLayoutParams(); |
Andrew Lee | 020ba62 | 2014-04-25 15:26:35 -0700 | [diff] [blame] | 363 | int widthSpec; |
| 364 | int heightSpec; |
| 365 | |
| 366 | if (layoutParams != null && layoutParams.width > 0) { |
| 367 | widthSpec = View.MeasureSpec |
| 368 | .makeMeasureSpec(layoutParams.width, View.MeasureSpec.EXACTLY); |
| 369 | } else { |
| 370 | widthSpec = View.MeasureSpec |
| 371 | .makeMeasureSpec(mHeaderWidth, View.MeasureSpec.EXACTLY); |
| 372 | } |
| 373 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 374 | if (layoutParams != null && layoutParams.height > 0) { |
| 375 | heightSpec = View.MeasureSpec |
| 376 | .makeMeasureSpec(layoutParams.height, View.MeasureSpec.EXACTLY); |
| 377 | } else { |
| 378 | heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); |
| 379 | } |
| 380 | view.measure(widthSpec, heightSpec); |
| 381 | int height = view.getMeasuredHeight(); |
| 382 | mHeaders[viewIndex].height = height; |
Andrew Lee | 020ba62 | 2014-04-25 15:26:35 -0700 | [diff] [blame] | 383 | view.layout(0, 0, view.getMeasuredWidth(), height); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 384 | } |
| 385 | } |
| 386 | |
| 387 | /** |
| 388 | * Returns the sum of heights of headers pinned to the top. |
| 389 | */ |
| 390 | public int getTotalTopPinnedHeaderHeight() { |
| 391 | for (int i = mSize; --i >= 0;) { |
| 392 | PinnedHeader header = mHeaders[i]; |
| 393 | if (header.visible && header.state == TOP) { |
| 394 | return header.y + header.height; |
| 395 | } |
| 396 | } |
| 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * Returns the list item position at the specified y coordinate. |
| 402 | */ |
| 403 | public int getPositionAt(int y) { |
| 404 | do { |
| 405 | int position = pointToPosition(getPaddingLeft() + 1, y); |
| 406 | if (position != -1) { |
| 407 | return position; |
| 408 | } |
| 409 | // If position == -1, we must have hit a separator. Let's examine |
| 410 | // a nearby pixel |
| 411 | y--; |
| 412 | } while (y > 0); |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | @Override |
| 417 | public boolean onInterceptTouchEvent(MotionEvent ev) { |
Yorke Lee | fbae837 | 2013-10-01 09:17:08 -0700 | [diff] [blame] | 418 | mHeaderTouched = false; |
Yorke Lee | 528258e | 2013-09-20 15:21:23 -0700 | [diff] [blame] | 419 | if (super.onInterceptTouchEvent(ev)) { |
| 420 | return true; |
| 421 | } |
| 422 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 423 | if (mScrollState == SCROLL_STATE_IDLE) { |
| 424 | final int y = (int)ev.getY(); |
Yorke Lee | 4bacccc | 2013-10-15 15:41:59 -0700 | [diff] [blame] | 425 | final int x = (int)ev.getX(); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 426 | for (int i = mSize; --i >= 0;) { |
| 427 | PinnedHeader header = mHeaders[i]; |
John Shao | 9c129d5 | 2016-07-21 19:43:08 -0700 | [diff] [blame] | 428 | final int padding = ViewUtil.isViewLayoutRtl(this) ? |
| 429 | getWidth() - mHeaderPaddingStart - header.view.getWidth() : |
| 430 | mHeaderPaddingStart; |
Yorke Lee | 4bacccc | 2013-10-15 15:41:59 -0700 | [diff] [blame] | 431 | if (header.visible && header.y <= y && header.y + header.height > y && |
Andrew Lee | 020ba62 | 2014-04-25 15:26:35 -0700 | [diff] [blame] | 432 | x >= padding && padding + header.view.getWidth() >= x) { |
Yorke Lee | fbae837 | 2013-10-01 09:17:08 -0700 | [diff] [blame] | 433 | mHeaderTouched = true; |
| 434 | if (mScrollToSectionOnHeaderTouch && |
| 435 | ev.getAction() == MotionEvent.ACTION_DOWN) { |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 436 | return smoothScrollToPartition(i); |
| 437 | } else { |
| 438 | return true; |
| 439 | } |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | |
Yorke Lee | 528258e | 2013-09-20 15:21:23 -0700 | [diff] [blame] | 444 | return false; |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 445 | } |
| 446 | |
Yorke Lee | fbae837 | 2013-10-01 09:17:08 -0700 | [diff] [blame] | 447 | @Override |
| 448 | public boolean onTouchEvent(MotionEvent ev) { |
| 449 | if (mHeaderTouched) { |
| 450 | if (ev.getAction() == MotionEvent.ACTION_UP) { |
| 451 | mHeaderTouched = false; |
| 452 | } |
| 453 | return true; |
| 454 | } |
| 455 | return super.onTouchEvent(ev); |
John Shao | 9c129d5 | 2016-07-21 19:43:08 -0700 | [diff] [blame] | 456 | } |
Yorke Lee | fbae837 | 2013-10-01 09:17:08 -0700 | [diff] [blame] | 457 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 458 | private boolean smoothScrollToPartition(int partition) { |
Jay Shrauner | 0476093 | 2014-09-06 19:57:09 -0700 | [diff] [blame] | 459 | if (mAdapter == null) { |
| 460 | return false; |
| 461 | } |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 462 | final int position = mAdapter.getScrollPositionForHeader(partition); |
| 463 | if (position == -1) { |
| 464 | return false; |
| 465 | } |
| 466 | |
| 467 | int offset = 0; |
| 468 | for (int i = 0; i < partition; i++) { |
| 469 | PinnedHeader header = mHeaders[i]; |
| 470 | if (header.visible) { |
| 471 | offset += header.height; |
| 472 | } |
| 473 | } |
Yorke Lee | fbae837 | 2013-10-01 09:17:08 -0700 | [diff] [blame] | 474 | smoothScrollToPositionFromTop(position + getHeaderViewsCount(), offset, |
| 475 | DEFAULT_SMOOTH_SCROLL_DURATION); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 476 | return true; |
| 477 | } |
| 478 | |
| 479 | private void invalidateIfAnimating() { |
| 480 | mAnimating = false; |
| 481 | for (int i = 0; i < mSize; i++) { |
| 482 | if (mHeaders[i].animating) { |
| 483 | mAnimating = true; |
| 484 | invalidate(); |
| 485 | return; |
| 486 | } |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | @Override |
| 491 | protected void dispatchDraw(Canvas canvas) { |
| 492 | long currentTime = mAnimating ? System.currentTimeMillis() : 0; |
| 493 | |
| 494 | int top = 0; |
Andrew Lee | 020ba62 | 2014-04-25 15:26:35 -0700 | [diff] [blame] | 495 | int right = 0; |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 496 | int bottom = getBottom(); |
| 497 | boolean hasVisibleHeaders = false; |
| 498 | for (int i = 0; i < mSize; i++) { |
| 499 | PinnedHeader header = mHeaders[i]; |
| 500 | if (header.visible) { |
| 501 | hasVisibleHeaders = true; |
| 502 | if (header.state == BOTTOM && header.y < bottom) { |
| 503 | bottom = header.y; |
| 504 | } else if (header.state == TOP || header.state == FADING) { |
| 505 | int newTop = header.y + header.height; |
| 506 | if (newTop > top) { |
| 507 | top = newTop; |
| 508 | } |
| 509 | } |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | if (hasVisibleHeaders) { |
| 514 | canvas.save(); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | super.dispatchDraw(canvas); |
| 518 | |
| 519 | if (hasVisibleHeaders) { |
| 520 | canvas.restore(); |
| 521 | |
Yorke Lee | 3d3262b | 2014-08-30 19:08:27 -0700 | [diff] [blame] | 522 | // If the first item is visible and if it has a positive top that is greater than the |
| 523 | // first header's assigned y-value, use that for the first header's y value. This way, |
| 524 | // the header inherits any padding applied to the list view. |
Andrew Lee | 741cbbf | 2014-06-02 14:11:27 -0700 | [diff] [blame] | 525 | if (mSize > 0 && getFirstVisiblePosition() == 0) { |
| 526 | View firstChild = getChildAt(0); |
| 527 | PinnedHeader firstHeader = mHeaders[0]; |
| 528 | |
| 529 | if (firstHeader != null) { |
Andrew Lee | 84e3a88 | 2014-06-23 16:28:13 -0700 | [diff] [blame] | 530 | int firstHeaderTop = firstChild != null ? firstChild.getTop() : 0; |
Yorke Lee | 3d3262b | 2014-08-30 19:08:27 -0700 | [diff] [blame] | 531 | firstHeader.y = Math.max(firstHeader.y, firstHeaderTop); |
Andrew Lee | 741cbbf | 2014-06-02 14:11:27 -0700 | [diff] [blame] | 532 | } |
| 533 | } |
| 534 | |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 535 | // First draw top headers, then the bottom ones to handle the Z axis correctly |
| 536 | for (int i = mSize; --i >= 0;) { |
| 537 | PinnedHeader header = mHeaders[i]; |
| 538 | if (header.visible && (header.state == TOP || header.state == FADING)) { |
| 539 | drawHeader(canvas, header, currentTime); |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | for (int i = 0; i < mSize; i++) { |
| 544 | PinnedHeader header = mHeaders[i]; |
| 545 | if (header.visible && header.state == BOTTOM) { |
| 546 | drawHeader(canvas, header, currentTime); |
| 547 | } |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | invalidateIfAnimating(); |
| 552 | } |
| 553 | |
| 554 | private void drawHeader(Canvas canvas, PinnedHeader header, long currentTime) { |
| 555 | if (header.animating) { |
| 556 | int timeLeft = (int)(header.targetTime - currentTime); |
| 557 | if (timeLeft <= 0) { |
| 558 | header.y = header.targetY; |
| 559 | header.visible = header.targetVisible; |
| 560 | header.animating = false; |
| 561 | } else { |
| 562 | header.y = header.targetY + (header.sourceY - header.targetY) * timeLeft |
| 563 | / mAnimationDuration; |
| 564 | } |
| 565 | } |
| 566 | if (header.visible) { |
| 567 | View view = header.view; |
| 568 | int saveCount = canvas.save(); |
Andrew Lee | 020ba62 | 2014-04-25 15:26:35 -0700 | [diff] [blame] | 569 | int translateX = ViewUtil.isViewLayoutRtl(this) ? |
Andrew Lee | 741cbbf | 2014-06-02 14:11:27 -0700 | [diff] [blame] | 570 | getWidth() - mHeaderPaddingStart - view.getWidth() : |
Andrew Lee | 020ba62 | 2014-04-25 15:26:35 -0700 | [diff] [blame] | 571 | mHeaderPaddingStart; |
| 572 | canvas.translate(translateX, header.y); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 573 | if (header.state == FADING) { |
Andrew Lee | 741cbbf | 2014-06-02 14:11:27 -0700 | [diff] [blame] | 574 | mBounds.set(0, 0, view.getWidth(), view.getHeight()); |
Chiao Cheng | 89437e8 | 2012-11-01 13:41:51 -0700 | [diff] [blame] | 575 | canvas.saveLayerAlpha(mBounds, header.alpha, Canvas.ALL_SAVE_FLAG); |
| 576 | } |
| 577 | view.draw(canvas); |
| 578 | canvas.restoreToCount(saveCount); |
| 579 | } |
| 580 | } |
Jay Shrauner | 0476093 | 2014-09-06 19:57:09 -0700 | [diff] [blame] | 581 | } |