diff options
Diffstat (limited to 'mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/DynamicToolbarAnimator.java')
| -rw-r--r-- | mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/DynamicToolbarAnimator.java | 605 |
1 files changed, 605 insertions, 0 deletions
diff --git a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/DynamicToolbarAnimator.java b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/DynamicToolbarAnimator.java new file mode 100644 index 000000000..e299b5744 --- /dev/null +++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/gfx/DynamicToolbarAnimator.java @@ -0,0 +1,605 @@ +/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*- + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +package org.mozilla.gecko.gfx; + +import org.mozilla.gecko.AppConstants; +import org.mozilla.gecko.PrefsHelper; +import org.mozilla.gecko.util.FloatUtils; +import org.mozilla.gecko.util.ThreadUtils; + +import android.graphics.PointF; +import android.support.v4.view.ViewCompat; +import android.util.Log; +import android.view.MotionEvent; +import android.view.animation.LinearInterpolator; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.EnumSet; +import java.util.List; +import java.util.Set; + +public class DynamicToolbarAnimator { + private static final String LOGTAG = "GeckoDynamicToolbarAnimator"; + private static final String PREF_SCROLL_TOOLBAR_THRESHOLD = "browser.ui.scroll-toolbar-threshold"; + + public static enum PinReason { + RELAYOUT, + ACTION_MODE, + FULL_SCREEN, + CARET_DRAG + } + + private final Set<PinReason> pinFlags = Collections.synchronizedSet(EnumSet.noneOf(PinReason.class)); + + // The duration of the animation in ns + private static final long ANIMATION_DURATION = 150000000; + + private final GeckoLayerClient mTarget; + private final List<LayerView.DynamicToolbarListener> mListeners; + + /* The translation to be applied to the toolbar UI view. This is the + * distance from the default/initial location (at the top of the screen, + * visible to the user) to where we want it to be. This variable should + * always be between 0 (toolbar fully visible) and the height of the toolbar + * (toolbar fully hidden), inclusive. + */ + private float mToolbarTranslation; + + /* The translation to be applied to the LayerView. This is the distance from + * the default/initial location (just below the toolbar, with the bottom + * extending past the bottom of the screen) to where we want it to be. + * This variable should always be between 0 and the height of the toolbar, + * inclusive. + */ + private float mLayerViewTranslation; + + /* This stores the maximum translation that can be applied to the toolbar + * and layerview when scrolling. This is populated with the height of the + * toolbar. */ + private float mMaxTranslation; + + /* This interpolator is used for the above mentioned animation */ + private LinearInterpolator mInterpolator; + + /* This is the proportion of the viewport rect that needs to be travelled + * while scrolling before the translation will start taking effect. + */ + private float SCROLL_TOOLBAR_THRESHOLD = 0.20f; + /* The ID of the prefs listener for the scroll-toolbar threshold */ + private final PrefsHelper.PrefHandler mPrefObserver; + + /* While we are resizing the viewport to account for the toolbar, the Java + * code and painted layer metrics in the compositor have different notions + * of the CSS viewport height. The Java value is stored in the + * GeckoLayerClient's viewport metrics, and the Gecko one is stored here. + * This allows us to adjust fixed-pos items correctly. + * You must synchronize on mTarget.getLock() to read/write this. */ + private Integer mHeightDuringResize; + + /* This tracks if we should trigger a "snap" on the next composite. A "snap" + * is when we simultaneously move the LayerView and change the scroll offset + * in the compositor so that everything looks the same on the screen but + * has really been shifted. + * You must synchronize on |this| to read/write this. */ + private boolean mSnapRequired = false; + + /* The task that handles showing/hiding toolbar */ + private DynamicToolbarAnimationTask mAnimationTask; + + /* The start point of a drag, used for scroll-based dynamic toolbar + * behaviour. */ + private PointF mTouchStart; + private float mLastTouch; + + /* Set to true when root content is being scrolled */ + private boolean mScrollingRootContent; + + public DynamicToolbarAnimator(GeckoLayerClient aTarget) { + mTarget = aTarget; + mListeners = new ArrayList<LayerView.DynamicToolbarListener>(); + + mInterpolator = new LinearInterpolator(); + + // Listen to the dynamic toolbar pref + mPrefObserver = new PrefsHelper.PrefHandlerBase() { + @Override + public void prefValue(String pref, int value) { + SCROLL_TOOLBAR_THRESHOLD = value / 100.0f; + } + }; + PrefsHelper.addObserver(new String[] { PREF_SCROLL_TOOLBAR_THRESHOLD }, mPrefObserver); + } + + public void destroy() { + PrefsHelper.removeObserver(mPrefObserver); + } + + public void addTranslationListener(LayerView.DynamicToolbarListener aListener) { + mListeners.add(aListener); + } + + public void removeTranslationListener(LayerView.DynamicToolbarListener aListener) { + mListeners.remove(aListener); + } + + private void fireListeners() { + for (LayerView.DynamicToolbarListener listener : mListeners) { + listener.onTranslationChanged(mToolbarTranslation, mLayerViewTranslation); + } + } + + void onPanZoomStopped() { + for (LayerView.DynamicToolbarListener listener : mListeners) { + listener.onPanZoomStopped(); + } + } + + void onMetricsChanged(ImmutableViewportMetrics aMetrics) { + for (LayerView.DynamicToolbarListener listener : mListeners) { + listener.onMetricsChanged(aMetrics); + } + } + + public void setMaxTranslation(float maxTranslation) { + ThreadUtils.assertOnUiThread(); + if (maxTranslation < 0) { + Log.e(LOGTAG, "Got a negative max-translation value: " + maxTranslation + "; clamping to zero"); + mMaxTranslation = 0; + } else { + mMaxTranslation = maxTranslation; + } + } + + public float getMaxTranslation() { + return mMaxTranslation; + } + + public float getToolbarTranslation() { + return mToolbarTranslation; + } + + /** + * If true, scroll changes will not affect translation. + */ + public boolean isPinned() { + return !pinFlags.isEmpty(); + } + + public boolean isPinnedBy(PinReason reason) { + return pinFlags.contains(reason); + } + + public void setPinned(boolean pinned, PinReason reason) { + if (pinned) { + pinFlags.add(reason); + } else { + pinFlags.remove(reason); + } + } + + public void showToolbar(boolean immediately) { + animateToolbar(true, immediately); + } + + public void hideToolbar(boolean immediately) { + animateToolbar(false, immediately); + } + + public void setScrollingRootContent(boolean isRootContent) { + mScrollingRootContent = isRootContent; + } + + private void animateToolbar(final boolean showToolbar, boolean immediately) { + ThreadUtils.assertOnUiThread(); + + if (mAnimationTask != null) { + mTarget.getView().removeRenderTask(mAnimationTask); + mAnimationTask = null; + } + + float desiredTranslation = (showToolbar ? 0 : mMaxTranslation); + Log.v(LOGTAG, "Requested " + (immediately ? "immediate " : "") + "toolbar animation to translation " + desiredTranslation); + if (FloatUtils.fuzzyEquals(mToolbarTranslation, desiredTranslation)) { + // If we're already pretty much in the desired position, don't bother + // with a full animation; do an immediate jump + immediately = true; + Log.v(LOGTAG, "Changing animation to immediate jump"); + } + + if (showToolbar && immediately) { + // Special case for showing the toolbar immediately: some of the call + // sites expect this to happen synchronously, so let's do that. This + // is safe because if we are showing the toolbar from a hidden state + // there is no chance of showing garbage + mToolbarTranslation = desiredTranslation; + fireListeners(); + // And then proceed with the normal flow (some of which will be + // a no-op now)... + } + + if (!showToolbar) { + // If we are hiding the toolbar, we need to move the LayerView first, + // so that we don't end up showing garbage under the toolbar when + // it is hidden. In the case that we are showing the toolbar, we + // move the LayerView after the toolbar is shown - the + // DynamicToolbarAnimationTask calls that upon completion. + shiftLayerView(desiredTranslation); + } + + mAnimationTask = new DynamicToolbarAnimationTask(desiredTranslation, immediately, showToolbar); + mTarget.getView().postRenderTask(mAnimationTask); + } + + private synchronized void shiftLayerView(float desiredTranslation) { + float layerViewTranslationNeeded = desiredTranslation - mLayerViewTranslation; + mLayerViewTranslation = desiredTranslation; + synchronized (mTarget.getLock()) { + if (layerViewTranslationNeeded == 0 && isResizing()) { + // We're already in the middle of a snap, so this new call is + // redundant as it's snapping to the same place. Ignore it. + return; + } + mHeightDuringResize = new Integer(mTarget.getViewportMetrics().viewportRectHeight); + mSnapRequired = mTarget.setViewportSize( + mTarget.getView().getWidth(), + mTarget.getView().getHeight() - Math.round(mMaxTranslation - mLayerViewTranslation), + new PointF(0, -layerViewTranslationNeeded)); + if (!mSnapRequired) { + mHeightDuringResize = null; + ThreadUtils.postToUiThread(new Runnable() { + // Post to run it outside of the synchronize blocks. The + // delay shouldn't hurt. + @Override + public void run() { + fireListeners(); + } + }); + } + // Request a composite, which will trigger the snap. + mTarget.getView().requestRender(); + } + } + + IntSize getViewportSize() { + ThreadUtils.assertOnUiThread(); + + int viewWidth = mTarget.getView().getWidth(); + int viewHeight = mTarget.getView().getHeight(); + float toolbarTranslation = mToolbarTranslation; + if (mAnimationTask != null) { + // If we have an animation going, mToolbarTranslation may be in flux + // and we should use the final value it will settle on. + toolbarTranslation = mAnimationTask.getFinalToolbarTranslation(); + } + int viewHeightVisible = viewHeight - Math.round(mMaxTranslation - toolbarTranslation); + return new IntSize(viewWidth, viewHeightVisible); + } + + boolean isResizing() { + return mHeightDuringResize != null; + } + + private final Runnable mSnapRunnable = new Runnable() { + private int mFrame = 0; + + @Override + public final void run() { + // It takes 2 frames for the view translation to take effect, at + // least on a Nexus 4 device running Android 4.2.2. So we wait for + // two frames before doing the notifyAll(), otherwise we get a + // short user-visible glitch. + // TODO: find a better way to do this, if possible. + if (mFrame == 1) { + synchronized (this) { + this.notifyAll(); + } + mFrame = 0; + return; + } + + if (mFrame == 0) { + fireListeners(); + } + + ViewCompat.postOnAnimation(mTarget.getView(), this); + mFrame++; + } + }; + + void scrollChangeResizeCompleted() { + synchronized (mTarget.getLock()) { + Log.v(LOGTAG, "Scrollchange resize completed"); + mHeightDuringResize = null; + } + } + + /** + * "Shrinks" the absolute value of aValue by moving it closer to zero by + * aShrinkAmount, but prevents it from crossing over zero. If aShrinkAmount + * is negative it is ignored. + * @return The shrunken value. + */ + private static float shrinkAbs(float aValue, float aShrinkAmount) { + if (aShrinkAmount <= 0) { + return aValue; + } + float shrinkBy = Math.min(Math.abs(aValue), aShrinkAmount); + return (aValue < 0 ? aValue + shrinkBy : aValue - shrinkBy); + } + + /** + * This function takes in a scroll amount and decides how much of that + * should be used up to translate things on screen because of the dynamic + * toolbar behaviour. It returns the maximum amount that could be used + * for translation purposes; the rest must be used for scrolling. + */ + private float decideTranslation(float aDelta, + ImmutableViewportMetrics aMetrics, + float aTouchTravelDistance) { + + float exposeThreshold = aMetrics.getHeight() * SCROLL_TOOLBAR_THRESHOLD; + float translation = aDelta; + + if (translation < 0) { // finger moving upwards + translation = shrinkAbs(translation, aMetrics.getOverscroll().top); + + // If the toolbar is in a state between fully hidden and fully shown + // (i.e. the user is actively translating it), then we want the + // translation to take effect right away. Or if the user has moved + // their finger past the required threshold (and is not trying to + // scroll past the bottom of the page) then also we want the touch + // to cause translation. If the toolbar is fully visible, we only + // want the toolbar to hide if the user is scrolling the root content. + boolean inBetween = (mToolbarTranslation != 0 && mToolbarTranslation != mMaxTranslation); + boolean reachedThreshold = -aTouchTravelDistance >= exposeThreshold; + boolean atBottomOfPage = aMetrics.viewportRectBottom() >= aMetrics.pageRectBottom; + if (inBetween || (mScrollingRootContent && reachedThreshold && !atBottomOfPage)) { + return translation; + } + } else { // finger moving downwards + translation = shrinkAbs(translation, aMetrics.getOverscroll().bottom); + + // Ditto above comment, but in this case if they reached the top and + // the toolbar is not shown, then we do want to allow translation + // right away. + boolean inBetween = (mToolbarTranslation != 0 && mToolbarTranslation != mMaxTranslation); + boolean reachedThreshold = aTouchTravelDistance >= exposeThreshold; + boolean atTopOfPage = aMetrics.viewportRectTop <= aMetrics.pageRectTop; + boolean isToolbarTranslated = (mToolbarTranslation != 0); + if (inBetween || reachedThreshold || (atTopOfPage && isToolbarTranslated)) { + return translation; + } + } + + return 0; + } + + // Timestamp of the start of the touch event used to calculate toolbar velocity + private long mLastEventTime; + // Current velocity of the toolbar. Used to populate the velocity queue in C++APZ. + private float mVelocity; + + boolean onInterceptTouchEvent(MotionEvent event) { + if (isPinned()) { + return false; + } + + // Animations should never co-exist with the user touching the screen. + if (mAnimationTask != null) { + mTarget.getView().removeRenderTask(mAnimationTask); + mAnimationTask = null; + } + + // we only care about single-finger drags here; any other kind of event + // should reset and cause us to start over. + if (event.getToolType(0) == MotionEvent.TOOL_TYPE_MOUSE || + event.getActionMasked() != MotionEvent.ACTION_MOVE || + event.getPointerCount() != 1) + { + if (mTouchStart != null) { + Log.v(LOGTAG, "Resetting touch sequence due to non-move"); + mTouchStart = null; + mVelocity = 0.0f; + } + + if (event.getActionMasked() == MotionEvent.ACTION_UP) { + // We need to do this even if the toolbar is already fully + // visible or fully hidden, because this is what triggers the + // viewport resize in content and updates the viewport metrics. + boolean toolbarMostlyVisible = mToolbarTranslation < (mMaxTranslation / 2); + Log.v(LOGTAG, "All fingers lifted, completing " + (toolbarMostlyVisible ? "show" : "hide")); + animateToolbar(toolbarMostlyVisible, false); + } + return false; + } + + if (mTouchStart != null) { + float prevDir = mLastTouch - mTouchStart.y; + float newDir = event.getRawY() - mLastTouch; + if (prevDir != 0 && newDir != 0 && ((prevDir < 0) != (newDir < 0))) { + // If the direction of movement changed, reset the travel + // distance properties. + mTouchStart = null; + mVelocity = 0.0f; + } + } + + if (mTouchStart == null) { + mTouchStart = new PointF(event.getRawX(), event.getRawY()); + mLastTouch = event.getRawY(); + mLastEventTime = event.getEventTime(); + return false; + } + + float deltaY = event.getRawY() - mLastTouch; + long currentTime = event.getEventTime(); + float deltaTime = (float)(currentTime - mLastEventTime); + mLastEventTime = currentTime; + if (deltaTime > 0.0f) { + mVelocity = -deltaY / deltaTime; + } else { + mVelocity = 0.0f; + } + mLastTouch = event.getRawY(); + float travelDistance = event.getRawY() - mTouchStart.y; + + ImmutableViewportMetrics metrics = mTarget.getViewportMetrics(); + + if (metrics.getPageHeight() <= mTarget.getView().getHeight() && + mToolbarTranslation == 0) { + // If the page is short and the toolbar is already visible, don't + // allow translating it out of view. + return false; + } + + float translation = decideTranslation(deltaY, metrics, travelDistance); + + float oldToolbarTranslation = mToolbarTranslation; + float oldLayerViewTranslation = mLayerViewTranslation; + mToolbarTranslation = FloatUtils.clamp(mToolbarTranslation - translation, 0, mMaxTranslation); + mLayerViewTranslation = FloatUtils.clamp(mLayerViewTranslation - translation, 0, mMaxTranslation); + + if (oldToolbarTranslation == mToolbarTranslation && + oldLayerViewTranslation == mLayerViewTranslation) { + return false; + } + + if (mToolbarTranslation == mMaxTranslation) { + Log.v(LOGTAG, "Toolbar at maximum translation, calling shiftLayerView(" + mMaxTranslation + ")"); + shiftLayerView(mMaxTranslation); + } else if (mToolbarTranslation == 0) { + Log.v(LOGTAG, "Toolbar at minimum translation, calling shiftLayerView(0)"); + shiftLayerView(0); + } + + fireListeners(); + mTarget.getView().requestRender(); + return true; + } + + // Get the current velocity of the toolbar. + float getVelocity() { + return mVelocity; + } + + public PointF getVisibleEndOfLayerView() { + return new PointF(mTarget.getView().getWidth(), + mTarget.getView().getHeight() - mMaxTranslation + mLayerViewTranslation); + } + + private float bottomOfCssViewport(ImmutableViewportMetrics aMetrics) { + return (isResizing() ? mHeightDuringResize : aMetrics.getHeight()) + + mMaxTranslation - mLayerViewTranslation; + } + + private synchronized boolean getAndClearSnapRequired() { + boolean snapRequired = mSnapRequired; + mSnapRequired = false; + return snapRequired; + } + + void populateViewTransform(ViewTransform aTransform, ImmutableViewportMetrics aMetrics) { + if (getAndClearSnapRequired()) { + synchronized (mSnapRunnable) { + ViewCompat.postOnAnimation(mTarget.getView(), mSnapRunnable); + try { + // hold the in-progress composite until the views have been + // translated because otherwise there is a visible glitch. + // don't hold for more than 100ms just in case. + mSnapRunnable.wait(100); + } catch (InterruptedException ie) { + } + } + } + + aTransform.x = aMetrics.viewportRectLeft; + aTransform.y = aMetrics.viewportRectTop; + aTransform.width = aMetrics.viewportRectWidth; + aTransform.height = aMetrics.viewportRectHeight; + aTransform.scale = aMetrics.zoomFactor; + + aTransform.fixedLayerMarginTop = mLayerViewTranslation - mToolbarTranslation; + float bottomOfScreen = mTarget.getView().getHeight(); + // We want to move a fixed item from "bottomOfCssViewport" to + // "bottomOfScreen". But also the bottom margin > 0 means that bottom + // fixed-pos items will move upwards. + aTransform.fixedLayerMarginBottom = bottomOfCssViewport(aMetrics) - bottomOfScreen; + //Log.v(LOGTAG, "ViewTransform is x=" + aTransform.x + " y=" + aTransform.y + // + " z=" + aTransform.scale + " t=" + aTransform.fixedLayerMarginTop + // + " b=" + aTransform.fixedLayerMarginBottom); + } + + class DynamicToolbarAnimationTask extends RenderTask { + private final float mStartTranslation; + private final float mEndTranslation; + private final boolean mImmediate; + private final boolean mShiftLayerView; + private boolean mContinueAnimation; + + public DynamicToolbarAnimationTask(float aTranslation, boolean aImmediate, boolean aShiftLayerView) { + super(false); + mContinueAnimation = true; + mStartTranslation = mToolbarTranslation; + mEndTranslation = aTranslation; + mImmediate = aImmediate; + mShiftLayerView = aShiftLayerView; + } + + float getFinalToolbarTranslation() { + return mEndTranslation; + } + + @Override + public boolean internalRun(long timeDelta, long currentFrameStartTime) { + if (!mContinueAnimation) { + return false; + } + + // Calculate the progress (between 0 and 1) + final float progress = mImmediate + ? 1.0f + : mInterpolator.getInterpolation( + Math.min(1.0f, (System.nanoTime() - getStartTime()) + / (float)ANIMATION_DURATION)); + + // This runs on the compositor thread, so we need to post the + // actual work to the UI thread. + ThreadUtils.assertNotOnUiThread(); + + ThreadUtils.postToUiThread(new Runnable() { + @Override + public void run() { + // Move the toolbar as per the animation + mToolbarTranslation = FloatUtils.interpolate(mStartTranslation, mEndTranslation, progress); + fireListeners(); + + if (mShiftLayerView && progress >= 1.0f) { + shiftLayerView(mEndTranslation); + } + } + }); + + mTarget.getView().requestRender(); + if (progress >= 1.0f) { + mContinueAnimation = false; + } + return mContinueAnimation; + } + } + + class SnapMetrics { + public final int viewportWidth; + public final int viewportHeight; + public final float scrollChangeY; + + SnapMetrics(ImmutableViewportMetrics aMetrics, float aScrollChange) { + viewportWidth = aMetrics.viewportRectWidth; + viewportHeight = aMetrics.viewportRectHeight; + scrollChangeY = aScrollChange; + } + } +} |