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      1 /*
      2  * Copyright (C) 2012 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.gallery3d.app;
     18 
     19 import android.content.Context;
     20 import android.view.LayoutInflater;
     21 import android.view.View;
     22 import android.view.View.OnClickListener;
     23 import android.view.ViewGroup;
     24 import android.view.animation.AlphaAnimation;
     25 import android.view.animation.Animation;
     26 import android.widget.RelativeLayout;
     27 
     28 import com.android.gallery3d.R;
     29 
     30 import java.util.HashMap;
     31 import java.util.Map;
     32 
     33 public class PhotoPageBottomControls implements OnClickListener {
     34     public interface Delegate {
     35         public boolean canDisplayBottomControls();
     36         public boolean canDisplayBottomControl(int control);
     37         public void onBottomControlClicked(int control);
     38         public void refreshBottomControlsWhenReady();
     39     }
     40 
     41     private Delegate mDelegate;
     42     private ViewGroup mParentLayout;
     43     private ViewGroup mContainer;
     44 
     45     private boolean mContainerVisible = false;
     46     private Map<View, Boolean> mControlsVisible = new HashMap<View, Boolean>();
     47 
     48     private Animation mContainerAnimIn = new AlphaAnimation(0f, 1f);
     49     private Animation mContainerAnimOut = new AlphaAnimation(1f, 0f);
     50     private static final int CONTAINER_ANIM_DURATION_MS = 200;
     51 
     52     private static final int CONTROL_ANIM_DURATION_MS = 150;
     53     private static Animation getControlAnimForVisibility(boolean visible) {
     54         Animation anim = visible ? new AlphaAnimation(0f, 1f)
     55                 : new AlphaAnimation(1f, 0f);
     56         anim.setDuration(CONTROL_ANIM_DURATION_MS);
     57         return anim;
     58     }
     59 
     60     public PhotoPageBottomControls(Delegate delegate, Context context, RelativeLayout layout) {
     61         mDelegate = delegate;
     62         mParentLayout = layout;
     63 
     64         LayoutInflater inflater = (LayoutInflater) context
     65                 .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     66         mContainer = (ViewGroup) inflater
     67                 .inflate(R.layout.photopage_bottom_controls, mParentLayout, false);
     68         mParentLayout.addView(mContainer);
     69 
     70         for (int i = mContainer.getChildCount() - 1; i >= 0; i--) {
     71             View child = mContainer.getChildAt(i);
     72             child.setOnClickListener(this);
     73             mControlsVisible.put(child, false);
     74         }
     75 
     76         mContainerAnimIn.setDuration(CONTAINER_ANIM_DURATION_MS);
     77         mContainerAnimOut.setDuration(CONTAINER_ANIM_DURATION_MS);
     78 
     79         mDelegate.refreshBottomControlsWhenReady();
     80     }
     81 
     82     private void hide() {
     83         mContainer.clearAnimation();
     84         mContainerAnimOut.reset();
     85         mContainer.startAnimation(mContainerAnimOut);
     86         mContainer.setVisibility(View.INVISIBLE);
     87     }
     88 
     89     private void show() {
     90         mContainer.clearAnimation();
     91         mContainerAnimIn.reset();
     92         mContainer.startAnimation(mContainerAnimIn);
     93         mContainer.setVisibility(View.VISIBLE);
     94     }
     95 
     96     public void refresh() {
     97         boolean visible = mDelegate.canDisplayBottomControls();
     98         boolean containerVisibilityChanged = (visible != mContainerVisible);
     99         if (containerVisibilityChanged) {
    100             if (visible) {
    101                 show();
    102             } else {
    103                 hide();
    104             }
    105             mContainerVisible = visible;
    106         }
    107         if (!mContainerVisible) {
    108             return;
    109         }
    110         for (View control : mControlsVisible.keySet()) {
    111             Boolean prevVisibility = mControlsVisible.get(control);
    112             boolean curVisibility = mDelegate.canDisplayBottomControl(control.getId());
    113             if (prevVisibility.booleanValue() != curVisibility) {
    114                 if (!containerVisibilityChanged) {
    115                     control.clearAnimation();
    116                     control.startAnimation(getControlAnimForVisibility(curVisibility));
    117                 }
    118                 control.setVisibility(curVisibility ? View.VISIBLE : View.INVISIBLE);
    119                 mControlsVisible.put(control, curVisibility);
    120             }
    121         }
    122         // Force a layout change
    123         mContainer.requestLayout(); // Kick framework to draw the control.
    124     }
    125 
    126     public void cleanup() {
    127         mParentLayout.removeView(mContainer);
    128         mControlsVisible.clear();
    129     }
    130 
    131     @Override
    132     public void onClick(View view) {
    133         Boolean controlVisible = mControlsVisible.get(view);
    134         if (mContainerVisible && controlVisible != null && controlVisible.booleanValue()) {
    135             mDelegate.onBottomControlClicked(view.getId());
    136         }
    137     }
    138 }
    139