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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.documentsui.dirlist;
     18 
     19 import android.annotation.IntDef;
     20 import android.app.FragmentTransaction;
     21 import android.content.Context;
     22 import android.os.Bundle;
     23 import android.util.AttributeSet;
     24 import android.widget.LinearLayout;
     25 
     26 import com.android.documentsui.R;
     27 import com.android.documentsui.base.Shared;
     28 
     29 import java.lang.annotation.Retention;
     30 import java.lang.annotation.RetentionPolicy;
     31 
     32 /**
     33  * This class exists solely to support animated transition of our directory fragment.
     34  * The structure of this class is tightly coupled with the static animations defined in
     35  * res/animator, specifically the "position" property referenced by
     36  * res/animator/dir_{enter,leave}.xml.
     37  */
     38 public class AnimationView extends LinearLayout {
     39 
     40     @IntDef(flag = true, value = {
     41             ANIM_NONE,
     42             ANIM_SIDE,
     43             ANIM_LEAVE,
     44             ANIM_ENTER
     45     })
     46     @Retention(RetentionPolicy.SOURCE)
     47     public @interface AnimationType {}
     48     public static final int ANIM_NONE = 1;
     49     public static final int ANIM_SIDE = 2;
     50     public static final int ANIM_LEAVE = 3;
     51     public static final int ANIM_ENTER = 4;
     52 
     53     private float mPosition = 0f;
     54 
     55     // The distance the animation will cover...currently matches the height of the
     56     // content area.
     57     private int mSpan;
     58 
     59     public AnimationView(Context context) {
     60         super(context);
     61     }
     62 
     63     public AnimationView(Context context, AttributeSet attrs) {
     64         super(context, attrs);
     65     }
     66 
     67     @Override
     68     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
     69         super.onSizeChanged(w, h, oldw, oldh);
     70         mSpan = h;
     71         setPosition(mPosition);
     72     }
     73 
     74     public float getPosition() {
     75         return mPosition;
     76     }
     77 
     78     public void setPosition(float position) {
     79         mPosition = position;
     80         // Warning! If we ever decide to switch this to setX (slide left/right)
     81         // please remember to add RLT variations of the animations under res/animator-ldrtl.
     82         setY((mSpan > 0) ? (mPosition * mSpan) : 0);
     83 
     84         if (mPosition != 0) {
     85             setTranslationZ(getResources().getDimensionPixelSize(R.dimen.dir_elevation));
     86         } else {
     87             setTranslationZ(0);
     88         }
     89     }
     90 
     91     /**
     92      * Configures custom animations on the transaction according to the specified
     93      * @AnimationType.
     94      */
     95     static void setupAnimations(
     96             FragmentTransaction ft, @AnimationType int anim, Bundle args) {
     97         switch (anim) {
     98             case AnimationView.ANIM_SIDE:
     99                 args.putBoolean(Shared.EXTRA_IGNORE_STATE, true);
    100                 break;
    101             case AnimationView.ANIM_ENTER:
    102                 // TODO: Document which behavior is being tailored
    103                 //     by passing this bit. Remove if possible.
    104                 args.putBoolean(Shared.EXTRA_IGNORE_STATE, true);
    105                 ft.setCustomAnimations(R.animator.dir_enter, R.animator.fade_out);
    106                 break;
    107             case AnimationView.ANIM_LEAVE:
    108                 ft.setCustomAnimations(R.animator.fade_in, R.animator.dir_leave);
    109                 break;
    110         }
    111     }
    112 }
    113