/*
 * Copyright (C) 2014 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 android.transition;

import android.animation.Animator;
import android.animation.TimeInterpolator;
import android.annotation.IntDef;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;

import com.android.internal.R;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

This transition tracks changes to the visibility of target views in the start and end scenes and moves views in or out from one of the edges of the scene. Visibility is determined by both the View.setVisibility(int) state of the view as well as whether it is parented in the current view hierarchy. Disappearing Views are limited as described in Visibility.onDisappear(ViewGroup, TransitionValues, int, TransitionValues, int). /**
 * This transition tracks changes to the visibility of target views in the
 * start and end scenes and moves views in or out from one of the edges of the
 * scene. Visibility is determined by both the
 * {@link View#setVisibility(int)} state of the view as well as whether it
 * is parented in the current view hierarchy. Disappearing Views are
 * limited as described in {@link Visibility#onDisappear(android.view.ViewGroup,
 * TransitionValues, int, TransitionValues, int)}.
 */
public class Slide extends Visibility {
    private static final String TAG = "Slide";
    private static final TimeInterpolator sDecelerate = new DecelerateInterpolator();
    private static final TimeInterpolator sAccelerate = new AccelerateInterpolator();
    private static final String PROPNAME_SCREEN_POSITION = "android:slide:screenPosition";
    private CalculateSlide mSlideCalculator = sCalculateBottom;
    private @GravityFlag int mSlideEdge = Gravity.BOTTOM;
    private float mSlideFraction = 1;

    
@hide
/** @hide */
    @Retention(RetentionPolicy.SOURCE)
    @IntDef({Gravity.LEFT, Gravity.TOP, Gravity.RIGHT, Gravity.BOTTOM, Gravity.START, Gravity.END})
    public @interface GravityFlag {}

    private interface CalculateSlide {

        
Returns the translation value for view when it goes out of the scene /** Returns the translation value for view when it goes out of the scene */
        float getGoneX(ViewGroup sceneRoot, View view, float fraction);

        
Returns the translation value for view when it goes out of the scene /** Returns the translation value for view when it goes out of the scene */
        float getGoneY(ViewGroup sceneRoot, View view, float fraction);
    }

    private static abstract class CalculateSlideHorizontal implements CalculateSlide {

        @Override
        public float getGoneY(ViewGroup sceneRoot, View view, float fraction) {
            return view.getTranslationY();
        }
    }

    private static abstract class CalculateSlideVertical implements CalculateSlide {

        @Override
        public float getGoneX(ViewGroup sceneRoot, View view, float fraction) {
            return view.getTranslationX();
        }
    }

    private static final CalculateSlide sCalculateLeft = new CalculateSlideHorizontal() {
        @Override
        public float getGoneX(ViewGroup sceneRoot, View view, float fraction) {
            return view.getTranslationX() - sceneRoot.getWidth() * fraction;
        }
    };

    private static final CalculateSlide sCalculateStart = new CalculateSlideHorizontal() {
        @Override
        public float getGoneX(ViewGroup sceneRoot, View view, float fraction) {
            final boolean isRtl = sceneRoot.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
            final float x;
            if (isRtl) {
                x = view.getTranslationX() + sceneRoot.getWidth() * fraction;
            } else {
                x = view.getTranslationX() - sceneRoot.getWidth() * fraction;
            }
            return x;
        }
    };

    private static final CalculateSlide sCalculateTop = new CalculateSlideVertical() {
        @Override
        public float getGoneY(ViewGroup sceneRoot, View view, float fraction) {
            return view.getTranslationY() - sceneRoot.getHeight() * fraction;
        }
    };

    private static final CalculateSlide sCalculateRight = new CalculateSlideHorizontal() {
        @Override
        public float getGoneX(ViewGroup sceneRoot, View view, float fraction) {
            return view.getTranslationX() + sceneRoot.getWidth() * fraction;
        }
    };

    private static final CalculateSlide sCalculateEnd = new CalculateSlideHorizontal() {
        @Override
        public float getGoneX(ViewGroup sceneRoot, View view, float fraction) {
            final boolean isRtl = sceneRoot.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL;
            final float x;
            if (isRtl) {
                x = view.getTranslationX() - sceneRoot.getWidth() * fraction;
            } else {
                x = view.getTranslationX() + sceneRoot.getWidth() * fraction;
            }
            return x;
        }
    };

    private static final CalculateSlide sCalculateBottom = new CalculateSlideVertical() {
        @Override
        public float getGoneY(ViewGroup sceneRoot, View view, float fraction) {
            return view.getTranslationY() + sceneRoot.getHeight() * fraction;
        }
    };

    
Constructor using the default Gravity.BOTTOM slide edge direction. /**
     * Constructor using the default {@link Gravity#BOTTOM}
     * slide edge direction.
     */
    public Slide() {
        setSlideEdge(Gravity.BOTTOM);
    }

    
Constructor using the provided slide edge direction.
/**
     * Constructor using the provided slide edge direction.
     */
    public Slide(int slideEdge) {
        setSlideEdge(slideEdge);
    }

    public Slide(Context context, AttributeSet attrs) {
        super(context, attrs);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Slide);
        int edge = a.getInt(R.styleable.Slide_slideEdge, Gravity.BOTTOM);
        a.recycle();
        setSlideEdge(edge);
    }

    private void captureValues(TransitionValues transitionValues) {
        View view = transitionValues.view;
        int[] position = new int[2];
        view.getLocationOnScreen(position);
        transitionValues.values.put(PROPNAME_SCREEN_POSITION, position);
    }

    @Override
    public void captureStartValues(TransitionValues transitionValues) {
        super.captureStartValues(transitionValues);
        captureValues(transitionValues);
    }

    @Override
    public void captureEndValues(TransitionValues transitionValues) {
        super.captureEndValues(transitionValues);
        captureValues(transitionValues);
    }

    
Change the edge that Views appear and disappear from.
Params:
slideEdge – The edge of the scene to use for Views appearing and disappearing. One of Gravity.LEFT, Gravity.TOP, Gravity.RIGHT, Gravity.BOTTOM, Gravity.START, Gravity.END.
@attr
ref android.R.styleable#Slide_slideEdge/**
     * Change the edge that Views appear and disappear from.
     *
     * @param slideEdge The edge of the scene to use for Views appearing and disappearing. One of
     *                  {@link android.view.Gravity#LEFT}, {@link android.view.Gravity#TOP},
     *                  {@link android.view.Gravity#RIGHT}, {@link android.view.Gravity#BOTTOM},
     *                  {@link android.view.Gravity#START}, {@link android.view.Gravity#END}.
     * @attr ref android.R.styleable#Slide_slideEdge
     */
    public void setSlideEdge(@GravityFlag int slideEdge) {
        switch (slideEdge) {
            case Gravity.LEFT:
                mSlideCalculator = sCalculateLeft;
                break;
            case Gravity.TOP:
                mSlideCalculator = sCalculateTop;
                break;
            case Gravity.RIGHT:
                mSlideCalculator = sCalculateRight;
                break;
            case Gravity.BOTTOM:
                mSlideCalculator = sCalculateBottom;
                break;
            case Gravity.START:
                mSlideCalculator = sCalculateStart;
                break;
            case Gravity.END:
                mSlideCalculator = sCalculateEnd;
                break;
            default:
                throw new IllegalArgumentException("Invalid slide direction");
        }
        mSlideEdge = slideEdge;
        SidePropagation propagation = new SidePropagation();
        propagation.setSide(slideEdge);
        setPropagation(propagation);
    }

    
Returns the edge that Views appear and disappear from.
Returns:
the edge of the scene to use for Views appearing and disappearing. One of Gravity.LEFT, Gravity.TOP, Gravity.RIGHT, Gravity.BOTTOM, Gravity.START, Gravity.END.
@attr
ref android.R.styleable#Slide_slideEdge/**
     * Returns the edge that Views appear and disappear from.
     *
     * @return the edge of the scene to use for Views appearing and disappearing. One of
     *         {@link android.view.Gravity#LEFT}, {@link android.view.Gravity#TOP},
     *         {@link android.view.Gravity#RIGHT}, {@link android.view.Gravity#BOTTOM},
     *         {@link android.view.Gravity#START}, {@link android.view.Gravity#END}.
     * @attr ref android.R.styleable#Slide_slideEdge
     */
    @GravityFlag
    public int getSlideEdge() {
        return mSlideEdge;
    }

    @Override
    public Animator onAppear(ViewGroup sceneRoot, View view,
            TransitionValues startValues, TransitionValues endValues) {
        if (endValues == null) {
            return null;
        }
        int[] position = (int[]) endValues.values.get(PROPNAME_SCREEN_POSITION);
        float endX = view.getTranslationX();
        float endY = view.getTranslationY();
        float startX = mSlideCalculator.getGoneX(sceneRoot, view, mSlideFraction);
        float startY = mSlideCalculator.getGoneY(sceneRoot, view, mSlideFraction);
        return TranslationAnimationCreator
                .createAnimation(view, endValues, position[0], position[1],
                        startX, startY, endX, endY, sDecelerate, this);
    }

    @Override
    public Animator onDisappear(ViewGroup sceneRoot, View view,
            TransitionValues startValues, TransitionValues endValues) {
        if (startValues == null) {
            return null;
        }
        int[] position = (int[]) startValues.values.get(PROPNAME_SCREEN_POSITION);
        float startX = view.getTranslationX();
        float startY = view.getTranslationY();
        float endX = mSlideCalculator.getGoneX(sceneRoot, view, mSlideFraction);
        float endY = mSlideCalculator.getGoneY(sceneRoot, view, mSlideFraction);
        return TranslationAnimationCreator
                .createAnimation(view, startValues, position[0], position[1],
                        startX, startY, endX, endY, sAccelerate, this);
    }

    
@hide
/** @hide */
    public void setSlideFraction(float slideFraction) {
        mSlideFraction = slideFraction;
    }
}