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/*
* Copyright (C) 2016 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.allapps;
import android.animation.ObjectAnimator;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import com.android.launcher3.Launcher;
import com.android.launcher3.R;
import com.android.launcher3.pageindicators.CaretDrawable;
import com.android.launcher3.touch.SwipeDetector;
public class AllAppsCaretController {
// Determines when the caret should flip. Should be accessed via getThreshold()
private static final float CARET_THRESHOLD = 0.015f;
private static final float CARET_THRESHOLD_LAND = 0.5f;
// The velocity at which the caret will peak (i.e. exhibit a 90 degree bend)
private static final float PEAK_VELOCITY = SwipeDetector.RELEASE_VELOCITY_PX_MS * .7f;
private Launcher mLauncher;
private ObjectAnimator mCaretAnimator;
private CaretDrawable mCaretDrawable;
private float mLastCaretProgress;
private boolean mThresholdCrossed;
public AllAppsCaretController(CaretDrawable caret, Launcher launcher) {
mLauncher = launcher;
mCaretDrawable = caret;
final long caretAnimationDuration = launcher.getResources().getInteger(
R.integer.config_caretAnimationDuration);
final Interpolator caretInterpolator = AnimationUtils.loadInterpolator(launcher,
android.R.interpolator.fast_out_slow_in);
// We will set values later
mCaretAnimator = ObjectAnimator.ofFloat(mCaretDrawable, "caretProgress", 0);
mCaretAnimator.setDuration(caretAnimationDuration);
mCaretAnimator.setInterpolator(caretInterpolator);
}
/**
* Updates the state of the caret based on the progress of the {@link AllAppsContainerView}, as
* defined by the {@link AllAppsTransitionController}. Uses the container's velocity to adjust
* angle of caret.
*
* @param containerProgress The progress of the container in the range [0..1]
* @param velocity The velocity of the container
* @param dragging {@code true} if the container is being dragged
*/
public void updateCaret(float containerProgress, float velocity, boolean dragging) {
// If we're in portrait and the shift is not 0 or 1, adjust the caret based on velocity
if (getThreshold() < containerProgress && containerProgress < 1 - getThreshold() &&
!mLauncher.useVerticalBarLayout()) {
mThresholdCrossed = true;
// How fast are we moving as a percentage of the peak velocity?
final float pctOfFlingVelocity = Math.max(-1, Math.min(velocity / PEAK_VELOCITY, 1));
mCaretDrawable.setCaretProgress(pctOfFlingVelocity);
// Set the last caret progress to this progress to prevent animator cancellation
mLastCaretProgress = pctOfFlingVelocity;
// Animate to neutral. This is necessary so the caret doesn't "freeze" when the
// container stops moving (e.g., during a drag or when the threshold is reached).
animateCaretToProgress(CaretDrawable.PROGRESS_CARET_NEUTRAL);
} else if (!dragging) {
// Otherwise, if we're not dragging, match the caret to the appropriate state
if (containerProgress <= getThreshold()) { // All Apps is up
animateCaretToProgress(CaretDrawable.PROGRESS_CARET_POINTING_DOWN);
} else if (containerProgress >= 1 - getThreshold()) { // All Apps is down
animateCaretToProgress(CaretDrawable.PROGRESS_CARET_POINTING_UP);
}
}
}
private void animateCaretToProgress(float progress) {
// If the new progress is the same as the last progress we animated to, terminate early
if (Float.compare(mLastCaretProgress, progress) == 0) {
return;
}
if (mCaretAnimator.isRunning()) {
mCaretAnimator.cancel(); // Stop the animator in its tracks
}
// Update the progress and start the animation
mLastCaretProgress = progress;
mCaretAnimator.setFloatValues(progress);
mCaretAnimator.start();
}
private float getThreshold() {
// In landscape, just return the landscape threshold.
if (mLauncher.useVerticalBarLayout()) {
return CARET_THRESHOLD_LAND;
}
// Before the threshold is crossed, it is reported as zero. This makes the caret immediately
// responsive when a drag begins. After the threshold is crossed, we return the constant
// value. This means the caret will start its state-based adjustment sooner. That is, we
// won't have to wait until the panel is completely settled to begin animation.
return mThresholdCrossed ? CARET_THRESHOLD : 0f;
}
public void onDragStart() {
mThresholdCrossed = false;
}
}
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