diff options
Diffstat (limited to 'src/com/android/launcher3/SmoothPagedView.java')
-rw-r--r-- | src/com/android/launcher3/SmoothPagedView.java | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/src/com/android/launcher3/SmoothPagedView.java b/src/com/android/launcher3/SmoothPagedView.java deleted file mode 100644 index 4e331aa2c..000000000 --- a/src/com/android/launcher3/SmoothPagedView.java +++ /dev/null @@ -1,185 +0,0 @@ -/* - * Copyright (C) 2008 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -package com.android.launcher3; - -import android.content.Context; -import android.util.AttributeSet; -import android.view.animation.Interpolator; - -public abstract class SmoothPagedView extends PagedView { - private static final float SMOOTHING_SPEED = 0.75f; - private static final float SMOOTHING_CONSTANT = (float) (0.016 / Math.log(SMOOTHING_SPEED)); - - private float mBaseLineFlingVelocity; - private float mFlingVelocityInfluence; - - static final int DEFAULT_MODE = 0; - static final int X_LARGE_MODE = 1; - - int mScrollMode; - - private Interpolator mScrollInterpolator; - - public static class OvershootInterpolator implements Interpolator { - private static final float DEFAULT_TENSION = 1.3f; - private float mTension; - - public OvershootInterpolator() { - mTension = DEFAULT_TENSION; - } - - public void setDistance(int distance) { - mTension = distance > 0 ? DEFAULT_TENSION / distance : DEFAULT_TENSION; - } - - public void disableSettle() { - mTension = 0.f; - } - - public float getInterpolation(float t) { - t -= 1.0f; - return t * t * ((mTension + 1) * t + mTension) + 1.0f; - } - } - - /** - * Used to inflate the Workspace from XML. - * - * @param context The application's context. - * @param attrs The attributes set containing the Workspace's customization values. - */ - public SmoothPagedView(Context context, AttributeSet attrs) { - this(context, attrs, 0); - } - - /** - * Used to inflate the Workspace from XML. - * - * @param context The application's context. - * @param attrs The attributes set containing the Workspace's customization values. - * @param defStyle Unused. - */ - public SmoothPagedView(Context context, AttributeSet attrs, int defStyle) { - super(context, attrs, defStyle); - - mUsePagingTouchSlop = false; - - // This means that we'll take care of updating the scroll parameter ourselves (we do it - // in computeScroll), we only do this in the OVERSHOOT_MODE, ie. on phones - mDeferScrollUpdate = mScrollMode != X_LARGE_MODE; - } - - protected int getScrollMode() { - return X_LARGE_MODE; - } - - /** - * Initializes various states for this workspace. - */ - @Override - protected void init() { - super.init(); - - mScrollMode = getScrollMode(); - if (mScrollMode == DEFAULT_MODE) { - mBaseLineFlingVelocity = 2500.0f; - mFlingVelocityInfluence = 0.4f; - mScrollInterpolator = new OvershootInterpolator(); - setDefaultInterpolator(mScrollInterpolator); - } - } - - @Override - protected void snapToDestination() { - if (mScrollMode == X_LARGE_MODE) { - super.snapToDestination(); - } else { - snapToPageWithVelocity(getPageNearestToCenterOfScreen(), 0); - } - } - - @Override - protected void snapToPageWithVelocity(int whichPage, int velocity) { - if (mScrollMode == X_LARGE_MODE) { - super.snapToPageWithVelocity(whichPage, velocity); - } else { - snapToPageWithVelocity(whichPage, 0, true); - } - } - - private void snapToPageWithVelocity(int whichPage, int velocity, boolean settle) { - // if (!mScroller.isFinished()) return; - - whichPage = Math.max(0, Math.min(whichPage, getChildCount() - 1)); - - final int screenDelta = Math.max(1, Math.abs(whichPage - mCurrentPage)); - final int newX = getScrollForPage(whichPage); - final int delta = newX - mUnboundedScrollX; - int duration = (screenDelta + 1) * 100; - - if (!mScroller.isFinished()) { - mScroller.abortAnimation(); - } - - if (settle) { - ((OvershootInterpolator) mScrollInterpolator).setDistance(screenDelta); - } else { - ((OvershootInterpolator) mScrollInterpolator).disableSettle(); - } - - velocity = Math.abs(velocity); - if (velocity > 0) { - duration += (duration / (velocity / mBaseLineFlingVelocity)) * mFlingVelocityInfluence; - } else { - duration += 100; - } - - snapToPage(whichPage, delta, duration); - } - - @Override - protected void snapToPage(int whichPage) { - if (mScrollMode == X_LARGE_MODE) { - super.snapToPage(whichPage); - } else { - snapToPageWithVelocity(whichPage, 0, false); - } - } - - @Override - public void computeScroll() { - if (mScrollMode == X_LARGE_MODE) { - super.computeScroll(); - } else { - boolean scrollComputed = computeScrollHelper(); - - if (!scrollComputed && mTouchState == TOUCH_STATE_SCROLLING) { - final float now = System.nanoTime() / NANOTIME_DIV; - final float e = (float) Math.exp((now - mSmoothingTime) / SMOOTHING_CONSTANT); - - final float dx = mTouchX - mUnboundedScrollX; - scrollTo(Math.round(mUnboundedScrollX + dx * e), getScrollY()); - mSmoothingTime = now; - - // Keep generating points as long as we're more than 1px away from the target - if (dx > 1.f || dx < -1.f) { - invalidate(); - } - } - } - } -} |