src/com/android/launcher3/PinchAnimationManager.java - platform/packages/apps/Launcher3 - Git at Google

 /*
  * 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;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.util.Log;
 import android.view.View;
 import android.view.animation.LinearInterpolator;

 import static com.android.launcher3.Workspace.State.NORMAL;
 import static com.android.launcher3.Workspace.State.OVERVIEW;

 /**
  * Manages the animations that play as the user pinches to/from overview mode.
  *
  *  It will look like this pinching in:
  * - Workspace scales down
  * - At some threshold 1, hotseat and QSB fade out (full animation)
  * - At a later threshold 2, panel buttons fade in and scrim fades in
  * - At a final threshold 3, snap to overview
  *
  * Pinching out:
  * - Workspace scales up
  * - At threshold 1, panel buttons fade out
  * - At threshold 2, hotseat and QSB fade in and scrim fades out
  * - At threshold 3, snap to workspace
  *
  * @see PinchToOverviewListener
  * @see PinchThresholdManager
  */
 public class PinchAnimationManager {
     private static final String TAG = "PinchAnimationManager";

     private static final int THRESHOLD_ANIM_DURATION = 150;
     private static final LinearInterpolator INTERPOLATOR = new LinearInterpolator();

     private static final int INDEX_PAGE_INDICATOR = 0;
     private static final int INDEX_HOTSEAT = 1;
     private static final int INDEX_OVERVIEW_PANEL_BUTTONS = 2;
     private static final int INDEX_SCRIM = 3;

     private final Animator[] mAnimators = new Animator[4];

     private final int[] mVisiblePageRange = new int[2];
     private Launcher mLauncher;
     private Workspace mWorkspace;

     private float mOverviewScale;
     private float mOverviewTranslationY;
     private int mNormalOverviewTransitionDuration;
     private boolean mIsAnimating;

     public PinchAnimationManager(Launcher launcher) {
         mLauncher = launcher;
         mWorkspace = launcher.mWorkspace;

         mOverviewScale = mWorkspace.getOverviewModeShrinkFactor();
         mOverviewTranslationY = mWorkspace.getOverviewModeTranslationY();
         mNormalOverviewTransitionDuration = mWorkspace.getStateTransitionAnimation()
                 .mOverviewTransitionTime;
     }

     public int getNormalOverviewTransitionDuration() {
         return mNormalOverviewTransitionDuration;
     }

     /**
      * Interpolate from {@param currentProgress} to {@param toProgress}, calling
      * {@link #setAnimationProgress(float)} throughout the duration. If duration is -1,
      * the default overview transition duration is used.
      */
     public void animateToProgress(float currentProgress, float toProgress, int duration,
             final PinchThresholdManager thresholdManager) {
         if (duration == -1) {
             duration = mNormalOverviewTransitionDuration;
         }
         ValueAnimator animator = ValueAnimator.ofFloat(currentProgress, toProgress);
         animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                 @Override
                 public void onAnimationUpdate(ValueAnimator animation) {
                     float pinchProgress = (Float) animation.getAnimatedValue();
                     setAnimationProgress(pinchProgress);
                     thresholdManager.updateAndAnimatePassedThreshold(pinchProgress,
                             PinchAnimationManager.this);
                 }
             }
         );
         animator.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
                 mIsAnimating = false;
                 thresholdManager.reset();
                 mWorkspace.onLauncherTransitionEnd(mLauncher, false, true);
             }
         });
         animator.setDuration(duration).start();
         mIsAnimating = true;
     }

     public boolean isAnimating() {
         return mIsAnimating;
     }

     /**
      * Animates to the specified progress. This should be called repeatedly throughout the pinch
      * gesture to run animations that interpolate throughout the gesture.
      * @param interpolatedProgress The progress from 0 to 1, where 0 is overview and 1 is workspace.
      */
     public void setAnimationProgress(float interpolatedProgress) {
         float interpolatedScale = interpolatedProgress * (1f - mOverviewScale) + mOverviewScale;
         float interpolatedTranslationY = (1f - interpolatedProgress) * mOverviewTranslationY;
         mWorkspace.setScaleX(interpolatedScale);
         mWorkspace.setScaleY(interpolatedScale);
         mWorkspace.setTranslationY(interpolatedTranslationY);
         setOverviewPanelsAlpha(1f - interpolatedProgress, 0);
     }

     /**
      * Animates certain properties based on which threshold was passed, and in what direction. The
      * starting state must also be taken into account because the thresholds mean different things
      * when going from workspace to overview and vice versa.
      * @param threshold One of {@link PinchThresholdManager#THRESHOLD_ONE},
      *                  {@link PinchThresholdManager#THRESHOLD_TWO}, or
      *                  {@link PinchThresholdManager#THRESHOLD_THREE}
      * @param startState {@link Workspace.State#NORMAL} or {@link Workspace.State#OVERVIEW}.
      * @param goingTowards {@link Workspace.State#NORMAL} or {@link Workspace.State#OVERVIEW}.
      *                     Note that this doesn't have to be the opposite of startState;
      */
     public void animateThreshold(float threshold, Workspace.State startState,
             Workspace.State goingTowards) {
         if (threshold == PinchThresholdManager.THRESHOLD_ONE) {
             if (startState == OVERVIEW) {
                 animateOverviewPanelButtons(goingTowards == OVERVIEW);
             } else if (startState == NORMAL) {
                 animateHotseatAndPageIndicator(goingTowards == NORMAL);
                 animateQsb(goingTowards == NORMAL);
             }
         } else if (threshold == PinchThresholdManager.THRESHOLD_TWO) {
             if (startState == OVERVIEW) {
                 animateHotseatAndPageIndicator(goingTowards == NORMAL);
                 animateQsb(goingTowards == NORMAL);
                 animateScrim(goingTowards == OVERVIEW);
             } else if (startState == NORMAL) {
                 animateOverviewPanelButtons(goingTowards == OVERVIEW);
                 animateScrim(goingTowards == OVERVIEW);
             }
         } else if (threshold == PinchThresholdManager.THRESHOLD_THREE) {
             // Passing threshold 3 ends the pinch and snaps to the new state.
             if (startState == OVERVIEW && goingTowards == NORMAL) {
                 mLauncher.showWorkspace(true);
                 mWorkspace.snapToPage(mWorkspace.getCurrentPage());
             } else if (startState == NORMAL && goingTowards == OVERVIEW) {
                 mLauncher.showOverviewMode(true);
             }
         } else {
             Log.e(TAG, "Received unknown threshold to animate: " + threshold);
         }
     }

     private void setOverviewPanelsAlpha(float alpha, int duration) {
         mWorkspace.getVisiblePages(mVisiblePageRange);
         for (int i = mVisiblePageRange[0]; i <= mVisiblePageRange[1]; i++) {
             View page = mWorkspace.getPageAt(i);
             if (!mWorkspace.shouldDrawChild(page)) {
                 continue;
             }
             if (duration == 0) {
                 ((CellLayout) page).setBackgroundAlpha(alpha);
             } else {
                 ObjectAnimator.ofFloat(page, "backgroundAlpha", alpha)
                         .setDuration(duration).start();
             }
         }
     }

     private void animateHotseatAndPageIndicator(boolean show) {
         animateShowHideView(INDEX_HOTSEAT, mLauncher.getHotseat(), show);
         if (mWorkspace.getPageIndicator() != null) {
             // There aren't page indicators in landscape mode on phones, hence the null check.
             animateShowHideView(INDEX_PAGE_INDICATOR, mWorkspace.getPageIndicator(), show);
         }
     }

     private void animateQsb(boolean show) {
         SearchDropTargetBar.State searchBarState = show ? SearchDropTargetBar.State.SEARCH_BAR
                 : SearchDropTargetBar.State.INVISIBLE;
         mLauncher.getSearchDropTargetBar().animateToState(searchBarState, THRESHOLD_ANIM_DURATION);
     }

     private void animateOverviewPanelButtons(boolean show) {
         animateShowHideView(INDEX_OVERVIEW_PANEL_BUTTONS, mLauncher.getOverviewPanel(), show);
     }

     private void animateScrim(boolean show) {
         float endValue = show ? mWorkspace.getStateTransitionAnimation().mWorkspaceScrimAlpha : 0;
         startAnimator(INDEX_SCRIM,
                 ObjectAnimator.ofFloat(mLauncher.getDragLayer(), "backgroundAlpha", endValue),
                 mNormalOverviewTransitionDuration);
     }

     private void animateShowHideView(int index, final View view, boolean show) {
         Animator animator = new LauncherViewPropertyAnimator(view).alpha(show ? 1 : 0).withLayer();
         if (show) {
             view.setVisibility(View.VISIBLE);
         } else {
             animator.addListener(new AnimatorListenerAdapter() {
                 @Override
                 public void onAnimationEnd(Animator animation) {
                     view.setVisibility(View.INVISIBLE);
                 }
             });
         }
         startAnimator(index, animator, THRESHOLD_ANIM_DURATION);
     }

     private void startAnimator(int index, Animator animator, long duration) {
         if (mAnimators[index] != null) {
             mAnimators[index].removeAllListeners();
             mAnimators[index].cancel();
         }
         mAnimators[index] = animator;
         mAnimators[index].setInterpolator(INTERPOLATOR);
         mAnimators[index].setDuration(duration).start();
     }
 }
	/*
	* 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;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.ObjectAnimator;
	import android.animation.ValueAnimator;
	import android.util.Log;
	import android.view.View;
	import android.view.animation.LinearInterpolator;

	import static com.android.launcher3.Workspace.State.NORMAL;
	import static com.android.launcher3.Workspace.State.OVERVIEW;

	/**
	* Manages the animations that play as the user pinches to/from overview mode.
	*
	* It will look like this pinching in:
	* - Workspace scales down
	* - At some threshold 1, hotseat and QSB fade out (full animation)
	* - At a later threshold 2, panel buttons fade in and scrim fades in
	* - At a final threshold 3, snap to overview
	*
	* Pinching out:
	* - Workspace scales up
	* - At threshold 1, panel buttons fade out
	* - At threshold 2, hotseat and QSB fade in and scrim fades out
	* - At threshold 3, snap to workspace
	*
	* @see PinchToOverviewListener
	* @see PinchThresholdManager
	*/
	public class PinchAnimationManager {
	private static final String TAG = "PinchAnimationManager";

	private static final int THRESHOLD_ANIM_DURATION = 150;
	private static final LinearInterpolator INTERPOLATOR = new LinearInterpolator();

	private static final int INDEX_PAGE_INDICATOR = 0;
	private static final int INDEX_HOTSEAT = 1;
	private static final int INDEX_OVERVIEW_PANEL_BUTTONS = 2;
	private static final int INDEX_SCRIM = 3;

	private final Animator[] mAnimators = new Animator[4];

	private final int[] mVisiblePageRange = new int[2];
	private Launcher mLauncher;
	private Workspace mWorkspace;

	private float mOverviewScale;
	private float mOverviewTranslationY;
	private int mNormalOverviewTransitionDuration;
	private boolean mIsAnimating;

	public PinchAnimationManager(Launcher launcher) {
	mLauncher = launcher;
	mWorkspace = launcher.mWorkspace;

	mOverviewScale = mWorkspace.getOverviewModeShrinkFactor();
	mOverviewTranslationY = mWorkspace.getOverviewModeTranslationY();
	mNormalOverviewTransitionDuration = mWorkspace.getStateTransitionAnimation()
	.mOverviewTransitionTime;
	}

	public int getNormalOverviewTransitionDuration() {
	return mNormalOverviewTransitionDuration;
	}

	/**
	* Interpolate from {@param currentProgress} to {@param toProgress}, calling
	* {@link #setAnimationProgress(float)} throughout the duration. If duration is -1,
	* the default overview transition duration is used.
	*/
	public void animateToProgress(float currentProgress, float toProgress, int duration,
	final PinchThresholdManager thresholdManager) {
	if (duration == -1) {
	duration = mNormalOverviewTransitionDuration;
	}
	ValueAnimator animator = ValueAnimator.ofFloat(currentProgress, toProgress);
	animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
	@Override
	public void onAnimationUpdate(ValueAnimator animation) {
	float pinchProgress = (Float) animation.getAnimatedValue();
	setAnimationProgress(pinchProgress);
	thresholdManager.updateAndAnimatePassedThreshold(pinchProgress,
	PinchAnimationManager.this);
	}
	}
	);
	animator.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	mIsAnimating = false;
	thresholdManager.reset();
	mWorkspace.onLauncherTransitionEnd(mLauncher, false, true);
	}
	});
	animator.setDuration(duration).start();
	mIsAnimating = true;
	}

	public boolean isAnimating() {
	return mIsAnimating;
	}

	/**
	* Animates to the specified progress. This should be called repeatedly throughout the pinch
	* gesture to run animations that interpolate throughout the gesture.
	* @param interpolatedProgress The progress from 0 to 1, where 0 is overview and 1 is workspace.
	*/
	public void setAnimationProgress(float interpolatedProgress) {
	float interpolatedScale = interpolatedProgress * (1f - mOverviewScale) + mOverviewScale;
	float interpolatedTranslationY = (1f - interpolatedProgress) * mOverviewTranslationY;
	mWorkspace.setScaleX(interpolatedScale);
	mWorkspace.setScaleY(interpolatedScale);
	mWorkspace.setTranslationY(interpolatedTranslationY);
	setOverviewPanelsAlpha(1f - interpolatedProgress, 0);
	}

	/**
	* Animates certain properties based on which threshold was passed, and in what direction. The
	* starting state must also be taken into account because the thresholds mean different things
	* when going from workspace to overview and vice versa.
	* @param threshold One of {@link PinchThresholdManager#THRESHOLD_ONE},
	* {@link PinchThresholdManager#THRESHOLD_TWO}, or
	* {@link PinchThresholdManager#THRESHOLD_THREE}
	* @param startState {@link Workspace.State#NORMAL} or {@link Workspace.State#OVERVIEW}.
	* @param goingTowards {@link Workspace.State#NORMAL} or {@link Workspace.State#OVERVIEW}.
	* Note that this doesn't have to be the opposite of startState;
	*/
	public void animateThreshold(float threshold, Workspace.State startState,
	Workspace.State goingTowards) {
	if (threshold == PinchThresholdManager.THRESHOLD_ONE) {
	if (startState == OVERVIEW) {
	animateOverviewPanelButtons(goingTowards == OVERVIEW);
	} else if (startState == NORMAL) {
	animateHotseatAndPageIndicator(goingTowards == NORMAL);
	animateQsb(goingTowards == NORMAL);
	}
	} else if (threshold == PinchThresholdManager.THRESHOLD_TWO) {
	if (startState == OVERVIEW) {
	animateHotseatAndPageIndicator(goingTowards == NORMAL);
	animateQsb(goingTowards == NORMAL);
	animateScrim(goingTowards == OVERVIEW);
	} else if (startState == NORMAL) {
	animateOverviewPanelButtons(goingTowards == OVERVIEW);
	animateScrim(goingTowards == OVERVIEW);
	}
	} else if (threshold == PinchThresholdManager.THRESHOLD_THREE) {
	// Passing threshold 3 ends the pinch and snaps to the new state.
	if (startState == OVERVIEW && goingTowards == NORMAL) {
	mLauncher.showWorkspace(true);
	mWorkspace.snapToPage(mWorkspace.getCurrentPage());
	} else if (startState == NORMAL && goingTowards == OVERVIEW) {
	mLauncher.showOverviewMode(true);
	}
	} else {
	Log.e(TAG, "Received unknown threshold to animate: " + threshold);
	}
	}

	private void setOverviewPanelsAlpha(float alpha, int duration) {
	mWorkspace.getVisiblePages(mVisiblePageRange);
	for (int i = mVisiblePageRange[0]; i <= mVisiblePageRange[1]; i++) {
	View page = mWorkspace.getPageAt(i);
	if (!mWorkspace.shouldDrawChild(page)) {
	continue;
	}
	if (duration == 0) {
	((CellLayout) page).setBackgroundAlpha(alpha);
	} else {
	ObjectAnimator.ofFloat(page, "backgroundAlpha", alpha)
	.setDuration(duration).start();
	}
	}
	}

	private void animateHotseatAndPageIndicator(boolean show) {
	animateShowHideView(INDEX_HOTSEAT, mLauncher.getHotseat(), show);
	if (mWorkspace.getPageIndicator() != null) {
	// There aren't page indicators in landscape mode on phones, hence the null check.
	animateShowHideView(INDEX_PAGE_INDICATOR, mWorkspace.getPageIndicator(), show);
	}
	}

	private void animateQsb(boolean show) {
	SearchDropTargetBar.State searchBarState = show ? SearchDropTargetBar.State.SEARCH_BAR
	: SearchDropTargetBar.State.INVISIBLE;
	mLauncher.getSearchDropTargetBar().animateToState(searchBarState, THRESHOLD_ANIM_DURATION);
	}

	private void animateOverviewPanelButtons(boolean show) {
	animateShowHideView(INDEX_OVERVIEW_PANEL_BUTTONS, mLauncher.getOverviewPanel(), show);
	}

	private void animateScrim(boolean show) {
	float endValue = show ? mWorkspace.getStateTransitionAnimation().mWorkspaceScrimAlpha : 0;
	startAnimator(INDEX_SCRIM,
	ObjectAnimator.ofFloat(mLauncher.getDragLayer(), "backgroundAlpha", endValue),
	mNormalOverviewTransitionDuration);
	}

	private void animateShowHideView(int index, final View view, boolean show) {
	Animator animator = new LauncherViewPropertyAnimator(view).alpha(show ? 1 : 0).withLayer();
	if (show) {
	view.setVisibility(View.VISIBLE);
	} else {
	animator.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	view.setVisibility(View.INVISIBLE);
	}
	});
	}
	startAnimator(index, animator, THRESHOLD_ANIM_DURATION);
	}

	private void startAnimator(int index, Animator animator, long duration) {
	if (mAnimators[index] != null) {
	mAnimators[index].removeAllListeners();
	mAnimators[index].cancel();
	}
	mAnimators[index] = animator;
	mAnimators[index].setInterpolator(INTERPOLATOR);
	mAnimators[index].setDuration(duration).start();
	}
	}