Adam Powell | 637d337 | 2010-08-25 14:37:03 -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 | |
| 17 | package android.widget; |
| 18 | |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 19 | import android.graphics.Rect; |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 20 | import com.android.internal.R; |
| 21 | |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 22 | import android.content.Context; |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 23 | import android.content.res.Resources; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 24 | import android.graphics.Canvas; |
| 25 | import android.graphics.drawable.Drawable; |
| 26 | import android.view.animation.AnimationUtils; |
| 27 | import android.view.animation.DecelerateInterpolator; |
| 28 | import android.view.animation.Interpolator; |
| 29 | |
| 30 | /** |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 31 | * This class performs the graphical effect used at the edges of scrollable widgets |
| 32 | * when the user scrolls beyond the content bounds in 2D space. |
| 33 | * |
| 34 | * <p>EdgeEffect is stateful. Custom widgets using EdgeEffect should create an |
| 35 | * instance for each edge that should show the effect, feed it input data using |
| 36 | * the methods {@link #onAbsorb(int)}, {@link #onPull(float)}, and {@link #onRelease()}, |
| 37 | * and draw the effect using {@link #draw(Canvas)} in the widget's overridden |
| 38 | * {@link android.view.View#draw(Canvas)} method. If {@link #isFinished()} returns |
| 39 | * false after drawing, the edge effect's animation is not yet complete and the widget |
| 40 | * should schedule another drawing pass to continue the animation.</p> |
| 41 | * |
| 42 | * <p>When drawing, widgets should draw their main content and child views first, |
| 43 | * usually by invoking <code>super.draw(canvas)</code> from an overridden <code>draw</code> |
| 44 | * method. (This will invoke onDraw and dispatch drawing to child views as needed.) |
| 45 | * The edge effect may then be drawn on top of the view's content using the |
| 46 | * {@link #draw(Canvas)} method.</p> |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 47 | */ |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 48 | public class EdgeEffect { |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 49 | @SuppressWarnings("UnusedDeclaration") |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 50 | private static final String TAG = "EdgeEffect"; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 51 | |
| 52 | // Time it will take the effect to fully recede in ms |
| 53 | private static final int RECEDE_TIME = 1000; |
| 54 | |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 55 | // Time it will take before a pulled glow begins receding in ms |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 56 | private static final int PULL_TIME = 167; |
| 57 | |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 58 | // Time it will take in ms for a pulled glow to decay to partial strength before release |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 59 | private static final int PULL_DECAY_TIME = 1000; |
| 60 | |
Adam Powell | 539ee87 | 2012-02-03 19:00:49 -0800 | [diff] [blame] | 61 | private static final float MAX_ALPHA = 1.f; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 62 | private static final float HELD_EDGE_SCALE_Y = 0.5f; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 63 | |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 64 | private static final float MAX_GLOW_HEIGHT = 4.f; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 65 | |
| 66 | private static final float PULL_GLOW_BEGIN = 1.f; |
| 67 | private static final float PULL_EDGE_BEGIN = 0.6f; |
| 68 | |
| 69 | // Minimum velocity that will be absorbed |
| 70 | private static final int MIN_VELOCITY = 100; |
Christian Robertson | 2d1acfc | 2013-09-27 18:54:28 -0700 | [diff] [blame] | 71 | // Maximum velocity, clamps at this value |
| 72 | private static final int MAX_VELOCITY = 10000; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 73 | |
| 74 | private static final float EPSILON = 0.001f; |
| 75 | |
| 76 | private final Drawable mEdge; |
| 77 | private final Drawable mGlow; |
| 78 | private int mWidth; |
| 79 | private int mHeight; |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 80 | private int mX; |
| 81 | private int mY; |
| 82 | private static final int MIN_WIDTH = 300; |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 83 | private final int mMinWidth; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 84 | |
| 85 | private float mEdgeAlpha; |
| 86 | private float mEdgeScaleY; |
| 87 | private float mGlowAlpha; |
| 88 | private float mGlowScaleY; |
| 89 | |
| 90 | private float mEdgeAlphaStart; |
| 91 | private float mEdgeAlphaFinish; |
| 92 | private float mEdgeScaleYStart; |
| 93 | private float mEdgeScaleYFinish; |
| 94 | private float mGlowAlphaStart; |
| 95 | private float mGlowAlphaFinish; |
| 96 | private float mGlowScaleYStart; |
| 97 | private float mGlowScaleYFinish; |
| 98 | |
| 99 | private long mStartTime; |
| 100 | private float mDuration; |
| 101 | |
| 102 | private final Interpolator mInterpolator; |
| 103 | |
| 104 | private static final int STATE_IDLE = 0; |
| 105 | private static final int STATE_PULL = 1; |
| 106 | private static final int STATE_ABSORB = 2; |
| 107 | private static final int STATE_RECEDE = 3; |
| 108 | private static final int STATE_PULL_DECAY = 4; |
| 109 | |
| 110 | // How much dragging should effect the height of the edge image. |
| 111 | // Number determined by user testing. |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 112 | private static final int PULL_DISTANCE_EDGE_FACTOR = 7; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 113 | |
| 114 | // How much dragging should effect the height of the glow image. |
| 115 | // Number determined by user testing. |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 116 | private static final int PULL_DISTANCE_GLOW_FACTOR = 7; |
| 117 | private static final float PULL_DISTANCE_ALPHA_GLOW_FACTOR = 1.1f; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 118 | |
| 119 | private static final int VELOCITY_EDGE_FACTOR = 8; |
Christian Robertson | 2d1acfc | 2013-09-27 18:54:28 -0700 | [diff] [blame] | 120 | private static final int VELOCITY_GLOW_FACTOR = 12; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 121 | |
| 122 | private int mState = STATE_IDLE; |
| 123 | |
| 124 | private float mPullDistance; |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 125 | |
| 126 | private final Rect mBounds = new Rect(); |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 127 | |
Romain Guy | a8bfeaf | 2012-03-15 13:14:14 -0700 | [diff] [blame] | 128 | private final int mEdgeHeight; |
| 129 | private final int mGlowHeight; |
| 130 | private final int mGlowWidth; |
| 131 | private final int mMaxEffectHeight; |
| 132 | |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 133 | /** |
| 134 | * Construct a new EdgeEffect with a theme appropriate for the provided context. |
| 135 | * @param context Context used to provide theming and resource information for the EdgeEffect |
| 136 | */ |
| 137 | public EdgeEffect(Context context) { |
| 138 | final Resources res = context.getResources(); |
| 139 | mEdge = res.getDrawable(R.drawable.overscroll_edge); |
| 140 | mGlow = res.getDrawable(R.drawable.overscroll_glow); |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 141 | |
Romain Guy | a8bfeaf | 2012-03-15 13:14:14 -0700 | [diff] [blame] | 142 | mEdgeHeight = mEdge.getIntrinsicHeight(); |
| 143 | mGlowHeight = mGlow.getIntrinsicHeight(); |
| 144 | mGlowWidth = mGlow.getIntrinsicWidth(); |
| 145 | |
| 146 | mMaxEffectHeight = (int) (Math.min( |
| 147 | mGlowHeight * MAX_GLOW_HEIGHT * mGlowHeight / mGlowWidth * 0.6f, |
| 148 | mGlowHeight * MAX_GLOW_HEIGHT) + 0.5f); |
| 149 | |
Christopher Tate | 1373a8e | 2011-11-10 19:59:13 -0800 | [diff] [blame] | 150 | mMinWidth = (int) (res.getDisplayMetrics().density * MIN_WIDTH + 0.5f); |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 151 | mInterpolator = new DecelerateInterpolator(); |
| 152 | } |
| 153 | |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 154 | /** |
| 155 | * Set the size of this edge effect in pixels. |
| 156 | * |
| 157 | * @param width Effect width in pixels |
| 158 | * @param height Effect height in pixels |
| 159 | */ |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 160 | public void setSize(int width, int height) { |
| 161 | mWidth = width; |
| 162 | mHeight = height; |
| 163 | } |
| 164 | |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 165 | /** |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 166 | * Set the position of this edge effect in pixels. This position is |
Romain Guy | a8bfeaf | 2012-03-15 13:14:14 -0700 | [diff] [blame] | 167 | * only used by {@link #getBounds(boolean)}. |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 168 | * |
| 169 | * @param x The position of the edge effect on the X axis |
| 170 | * @param y The position of the edge effect on the Y axis |
| 171 | */ |
| 172 | void setPosition(int x, int y) { |
| 173 | mX = x; |
| 174 | mY = y; |
| 175 | } |
| 176 | |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 177 | /** |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 178 | * Reports if this EdgeEffect's animation is finished. If this method returns false |
| 179 | * after a call to {@link #draw(Canvas)} the host widget should schedule another |
| 180 | * drawing pass to continue the animation. |
| 181 | * |
| 182 | * @return true if animation is finished, false if drawing should continue on the next frame. |
| 183 | */ |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 184 | public boolean isFinished() { |
| 185 | return mState == STATE_IDLE; |
| 186 | } |
| 187 | |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 188 | /** |
| 189 | * Immediately finish the current animation. |
| 190 | * After this call {@link #isFinished()} will return true. |
| 191 | */ |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 192 | public void finish() { |
| 193 | mState = STATE_IDLE; |
| 194 | } |
| 195 | |
| 196 | /** |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 197 | * A view should call this when content is pulled away from an edge by the user. |
| 198 | * This will update the state of the current visual effect and its associated animation. |
| 199 | * The host view should always {@link android.view.View#invalidate()} after this |
| 200 | * and draw the results accordingly. |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 201 | * |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 202 | * @param deltaDistance Change in distance since the last call. Values may be 0 (no change) to |
| 203 | * 1.f (full length of the view) or negative values to express change |
| 204 | * back toward the edge reached to initiate the effect. |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 205 | */ |
| 206 | public void onPull(float deltaDistance) { |
| 207 | final long now = AnimationUtils.currentAnimationTimeMillis(); |
| 208 | if (mState == STATE_PULL_DECAY && now - mStartTime < mDuration) { |
| 209 | return; |
| 210 | } |
| 211 | if (mState != STATE_PULL) { |
| 212 | mGlowScaleY = PULL_GLOW_BEGIN; |
| 213 | } |
| 214 | mState = STATE_PULL; |
| 215 | |
| 216 | mStartTime = now; |
| 217 | mDuration = PULL_TIME; |
| 218 | |
| 219 | mPullDistance += deltaDistance; |
| 220 | float distance = Math.abs(mPullDistance); |
| 221 | |
| 222 | mEdgeAlpha = mEdgeAlphaStart = Math.max(PULL_EDGE_BEGIN, Math.min(distance, MAX_ALPHA)); |
| 223 | mEdgeScaleY = mEdgeScaleYStart = Math.max( |
| 224 | HELD_EDGE_SCALE_Y, Math.min(distance * PULL_DISTANCE_EDGE_FACTOR, 1.f)); |
| 225 | |
| 226 | mGlowAlpha = mGlowAlphaStart = Math.min(MAX_ALPHA, |
| 227 | mGlowAlpha + |
| 228 | (Math.abs(deltaDistance) * PULL_DISTANCE_ALPHA_GLOW_FACTOR)); |
| 229 | |
| 230 | float glowChange = Math.abs(deltaDistance); |
| 231 | if (deltaDistance > 0 && mPullDistance < 0) { |
| 232 | glowChange = -glowChange; |
| 233 | } |
| 234 | if (mPullDistance == 0) { |
| 235 | mGlowScaleY = 0; |
| 236 | } |
| 237 | |
| 238 | // Do not allow glow to get larger than MAX_GLOW_HEIGHT. |
| 239 | mGlowScaleY = mGlowScaleYStart = Math.min(MAX_GLOW_HEIGHT, Math.max( |
| 240 | 0, mGlowScaleY + glowChange * PULL_DISTANCE_GLOW_FACTOR)); |
| 241 | |
| 242 | mEdgeAlphaFinish = mEdgeAlpha; |
| 243 | mEdgeScaleYFinish = mEdgeScaleY; |
| 244 | mGlowAlphaFinish = mGlowAlpha; |
| 245 | mGlowScaleYFinish = mGlowScaleY; |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Call when the object is released after being pulled. |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 250 | * This will begin the "decay" phase of the effect. After calling this method |
| 251 | * the host view should {@link android.view.View#invalidate()} and thereby |
| 252 | * draw the results accordingly. |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 253 | */ |
| 254 | public void onRelease() { |
| 255 | mPullDistance = 0; |
| 256 | |
| 257 | if (mState != STATE_PULL && mState != STATE_PULL_DECAY) { |
| 258 | return; |
| 259 | } |
| 260 | |
| 261 | mState = STATE_RECEDE; |
| 262 | mEdgeAlphaStart = mEdgeAlpha; |
| 263 | mEdgeScaleYStart = mEdgeScaleY; |
| 264 | mGlowAlphaStart = mGlowAlpha; |
| 265 | mGlowScaleYStart = mGlowScaleY; |
| 266 | |
| 267 | mEdgeAlphaFinish = 0.f; |
| 268 | mEdgeScaleYFinish = 0.f; |
| 269 | mGlowAlphaFinish = 0.f; |
| 270 | mGlowScaleYFinish = 0.f; |
| 271 | |
| 272 | mStartTime = AnimationUtils.currentAnimationTimeMillis(); |
| 273 | mDuration = RECEDE_TIME; |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * Call when the effect absorbs an impact at the given velocity. |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 278 | * Used when a fling reaches the scroll boundary. |
| 279 | * |
| 280 | * <p>When using a {@link android.widget.Scroller} or {@link android.widget.OverScroller}, |
| 281 | * the method <code>getCurrVelocity</code> will provide a reasonable approximation |
| 282 | * to use here.</p> |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 283 | * |
| 284 | * @param velocity Velocity at impact in pixels per second. |
| 285 | */ |
| 286 | public void onAbsorb(int velocity) { |
| 287 | mState = STATE_ABSORB; |
Christian Robertson | 2d1acfc | 2013-09-27 18:54:28 -0700 | [diff] [blame] | 288 | velocity = Math.min(Math.max(MIN_VELOCITY, Math.abs(velocity)), MAX_VELOCITY); |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 289 | |
| 290 | mStartTime = AnimationUtils.currentAnimationTimeMillis(); |
Christian Robertson | 2d1acfc | 2013-09-27 18:54:28 -0700 | [diff] [blame] | 291 | mDuration = 0.15f + (velocity * 0.02f); |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 292 | |
| 293 | // The edge should always be at least partially visible, regardless |
| 294 | // of velocity. |
| 295 | mEdgeAlphaStart = 0.f; |
| 296 | mEdgeScaleY = mEdgeScaleYStart = 0.f; |
| 297 | // The glow depends more on the velocity, and therefore starts out |
| 298 | // nearly invisible. |
Christian Robertson | 2d1acfc | 2013-09-27 18:54:28 -0700 | [diff] [blame] | 299 | mGlowAlphaStart = 0.3f; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 300 | mGlowScaleYStart = 0.f; |
| 301 | |
| 302 | // Factor the velocity by 8. Testing on device shows this works best to |
| 303 | // reflect the strength of the user's scrolling. |
| 304 | mEdgeAlphaFinish = Math.max(0, Math.min(velocity * VELOCITY_EDGE_FACTOR, 1)); |
| 305 | // Edge should never get larger than the size of its asset. |
| 306 | mEdgeScaleYFinish = Math.max( |
| 307 | HELD_EDGE_SCALE_Y, Math.min(velocity * VELOCITY_EDGE_FACTOR, 1.f)); |
| 308 | |
| 309 | // Growth for the size of the glow should be quadratic to properly |
| 310 | // respond |
| 311 | // to a user's scrolling speed. The faster the scrolling speed, the more |
| 312 | // intense the effect should be for both the size and the saturation. |
| 313 | mGlowScaleYFinish = Math.min(0.025f + (velocity * (velocity / 100) * 0.00015f), 1.75f); |
| 314 | // Alpha should change for the glow as well as size. |
| 315 | mGlowAlphaFinish = Math.max( |
| 316 | mGlowAlphaStart, Math.min(velocity * VELOCITY_GLOW_FACTOR * .00001f, MAX_ALPHA)); |
| 317 | } |
| 318 | |
| 319 | |
| 320 | /** |
| 321 | * Draw into the provided canvas. Assumes that the canvas has been rotated |
| 322 | * accordingly and the size has been set. The effect will be drawn the full |
Adam Powell | 89935e4 | 2011-08-31 14:26:12 -0700 | [diff] [blame] | 323 | * width of X=0 to X=width, beginning from Y=0 and extending to some factor < |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 324 | * 1.f of height. |
| 325 | * |
| 326 | * @param canvas Canvas to draw into |
| 327 | * @return true if drawing should continue beyond this frame to continue the |
| 328 | * animation |
| 329 | */ |
| 330 | public boolean draw(Canvas canvas) { |
| 331 | update(); |
| 332 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 333 | mGlow.setAlpha((int) (Math.max(0, Math.min(mGlowAlpha, 1)) * 255)); |
Mindy Pereira | a5531d7 | 2010-11-23 11:07:30 -0800 | [diff] [blame] | 334 | |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 335 | int glowBottom = (int) Math.min( |
Romain Guy | a8bfeaf | 2012-03-15 13:14:14 -0700 | [diff] [blame] | 336 | mGlowHeight * mGlowScaleY * mGlowHeight / mGlowWidth * 0.6f, |
| 337 | mGlowHeight * MAX_GLOW_HEIGHT); |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 338 | if (mWidth < mMinWidth) { |
| 339 | // Center the glow and clip it. |
Jim Miller | ffc4196 | 2011-03-02 20:41:46 -0800 | [diff] [blame] | 340 | int glowLeft = (mWidth - mMinWidth)/2; |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 341 | mGlow.setBounds(glowLeft, 0, mWidth - glowLeft, glowBottom); |
| 342 | } else { |
| 343 | // Stretch the glow to fit. |
| 344 | mGlow.setBounds(0, 0, mWidth, glowBottom); |
| 345 | } |
| 346 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 347 | mGlow.draw(canvas); |
| 348 | |
| 349 | mEdge.setAlpha((int) (Math.max(0, Math.min(mEdgeAlpha, 1)) * 255)); |
Mindy Pereira | a5531d7 | 2010-11-23 11:07:30 -0800 | [diff] [blame] | 350 | |
Romain Guy | a8bfeaf | 2012-03-15 13:14:14 -0700 | [diff] [blame] | 351 | int edgeBottom = (int) (mEdgeHeight * mEdgeScaleY); |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 352 | if (mWidth < mMinWidth) { |
| 353 | // Center the edge and clip it. |
Jim Miller | ffc4196 | 2011-03-02 20:41:46 -0800 | [diff] [blame] | 354 | int edgeLeft = (mWidth - mMinWidth)/2; |
Mindy Pereira | 4e30d89 | 2010-11-24 15:32:39 -0800 | [diff] [blame] | 355 | mEdge.setBounds(edgeLeft, 0, mWidth - edgeLeft, edgeBottom); |
| 356 | } else { |
| 357 | // Stretch the edge to fit. |
| 358 | mEdge.setBounds(0, 0, mWidth, edgeBottom); |
| 359 | } |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 360 | mEdge.draw(canvas); |
| 361 | |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 362 | if (mState == STATE_RECEDE && glowBottom == 0 && edgeBottom == 0) { |
| 363 | mState = STATE_IDLE; |
| 364 | } |
| 365 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 366 | return mState != STATE_IDLE; |
| 367 | } |
| 368 | |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 369 | /** |
| 370 | * Returns the bounds of the edge effect. |
Romain Guy | a8bfeaf | 2012-03-15 13:14:14 -0700 | [diff] [blame] | 371 | * |
| 372 | * @hide |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 373 | */ |
Romain Guy | a8bfeaf | 2012-03-15 13:14:14 -0700 | [diff] [blame] | 374 | public Rect getBounds(boolean reverse) { |
| 375 | mBounds.set(0, 0, mWidth, mMaxEffectHeight); |
| 376 | mBounds.offset(mX, mY - (reverse ? mMaxEffectHeight : 0)); |
| 377 | |
Romain Guy | 9d849a2 | 2012-03-14 16:41:42 -0700 | [diff] [blame] | 378 | return mBounds; |
| 379 | } |
| 380 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 381 | private void update() { |
| 382 | final long time = AnimationUtils.currentAnimationTimeMillis(); |
| 383 | final float t = Math.min((time - mStartTime) / mDuration, 1.f); |
| 384 | |
| 385 | final float interp = mInterpolator.getInterpolation(t); |
| 386 | |
| 387 | mEdgeAlpha = mEdgeAlphaStart + (mEdgeAlphaFinish - mEdgeAlphaStart) * interp; |
| 388 | mEdgeScaleY = mEdgeScaleYStart + (mEdgeScaleYFinish - mEdgeScaleYStart) * interp; |
| 389 | mGlowAlpha = mGlowAlphaStart + (mGlowAlphaFinish - mGlowAlphaStart) * interp; |
| 390 | mGlowScaleY = mGlowScaleYStart + (mGlowScaleYFinish - mGlowScaleYStart) * interp; |
| 391 | |
| 392 | if (t >= 1.f - EPSILON) { |
| 393 | switch (mState) { |
| 394 | case STATE_ABSORB: |
| 395 | mState = STATE_RECEDE; |
| 396 | mStartTime = AnimationUtils.currentAnimationTimeMillis(); |
| 397 | mDuration = RECEDE_TIME; |
| 398 | |
| 399 | mEdgeAlphaStart = mEdgeAlpha; |
| 400 | mEdgeScaleYStart = mEdgeScaleY; |
| 401 | mGlowAlphaStart = mGlowAlpha; |
| 402 | mGlowScaleYStart = mGlowScaleY; |
| 403 | |
| 404 | // After absorb, the glow and edge should fade to nothing. |
| 405 | mEdgeAlphaFinish = 0.f; |
| 406 | mEdgeScaleYFinish = 0.f; |
| 407 | mGlowAlphaFinish = 0.f; |
| 408 | mGlowScaleYFinish = 0.f; |
| 409 | break; |
| 410 | case STATE_PULL: |
| 411 | mState = STATE_PULL_DECAY; |
| 412 | mStartTime = AnimationUtils.currentAnimationTimeMillis(); |
| 413 | mDuration = PULL_DECAY_TIME; |
| 414 | |
| 415 | mEdgeAlphaStart = mEdgeAlpha; |
| 416 | mEdgeScaleYStart = mEdgeScaleY; |
| 417 | mGlowAlphaStart = mGlowAlpha; |
| 418 | mGlowScaleYStart = mGlowScaleY; |
| 419 | |
| 420 | // After pull, the glow and edge should fade to nothing. |
| 421 | mEdgeAlphaFinish = 0.f; |
| 422 | mEdgeScaleYFinish = 0.f; |
| 423 | mGlowAlphaFinish = 0.f; |
| 424 | mGlowScaleYFinish = 0.f; |
| 425 | break; |
| 426 | case STATE_PULL_DECAY: |
| 427 | // When receding, we want edge to decrease more slowly |
| 428 | // than the glow. |
| 429 | float factor = mGlowScaleYFinish != 0 ? 1 |
| 430 | / (mGlowScaleYFinish * mGlowScaleYFinish) |
| 431 | : Float.MAX_VALUE; |
| 432 | mEdgeScaleY = mEdgeScaleYStart + |
| 433 | (mEdgeScaleYFinish - mEdgeScaleYStart) * |
| 434 | interp * factor; |
Daniel Mladenovic | 0b1ab3a | 2011-02-21 09:17:40 +0100 | [diff] [blame] | 435 | mState = STATE_RECEDE; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 436 | break; |
| 437 | case STATE_RECEDE: |
| 438 | mState = STATE_IDLE; |
| 439 | break; |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | } |