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      1 /*
      2  * Copyright (C) 2011 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.launcher3;
     18 
     19 import android.content.Context;
     20 import android.content.res.TypedArray;
     21 import android.graphics.Canvas;
     22 import android.graphics.drawable.Drawable;
     23 import android.graphics.drawable.StateListDrawable;
     24 import android.util.AttributeSet;
     25 import android.view.MotionEvent;
     26 import android.view.View;
     27 import android.widget.ImageView;
     28 
     29 public class HolographicImageView extends ImageView {
     30 
     31     private final HolographicViewHelper mHolographicHelper;
     32     private boolean mHotwordOn;
     33     private boolean mIsPressed;
     34     private boolean mIsFocused;
     35 
     36     public HolographicImageView(Context context) {
     37         this(context, null);
     38     }
     39 
     40     public HolographicImageView(Context context, AttributeSet attrs) {
     41         this(context, attrs, 0);
     42     }
     43 
     44     public HolographicImageView(Context context, AttributeSet attrs, int defStyle) {
     45         super(context, attrs, defStyle);
     46 
     47         mHolographicHelper = new HolographicViewHelper(context);
     48         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.HolographicLinearLayout,
     49                 defStyle, 0);
     50         mHotwordOn = a.getBoolean(R.styleable.HolographicLinearLayout_stateHotwordOn, false);
     51         a.recycle();
     52 
     53         setOnTouchListener(new OnTouchListener() {
     54             @Override
     55             public boolean onTouch(View v, MotionEvent event) {
     56                 if (isPressed() != mIsPressed) {
     57                     mIsPressed = isPressed();
     58                     refreshDrawableState();
     59                 }
     60                 return false;
     61             }
     62         });
     63 
     64         setOnFocusChangeListener(new OnFocusChangeListener() {
     65             @Override
     66             public void onFocusChange(View v, boolean hasFocus) {
     67                 if (isFocused() != mIsFocused) {
     68                     mIsFocused = isFocused();
     69                     refreshDrawableState();
     70                 }
     71             }
     72         });
     73     }
     74 
     75     void invalidatePressedFocusedStates() {
     76         mHolographicHelper.invalidatePressedFocusedStates(this);
     77     }
     78 
     79     @Override
     80     protected void drawableStateChanged() {
     81         super.drawableStateChanged();
     82 
     83         mHolographicHelper.generatePressedFocusedStates(this);
     84         Drawable d = getDrawable();
     85         if (d instanceof StateListDrawable) {
     86             StateListDrawable sld = (StateListDrawable) d;
     87             sld.setState(getDrawableState());
     88             sld.invalidateSelf();
     89         }
     90     }
     91 
     92     @Override
     93     protected void onDraw(Canvas canvas) {
     94         super.onDraw(canvas);
     95 
     96         // One time call to generate the pressed/focused state -- must be called after
     97         // measure/layout
     98         mHolographicHelper.generatePressedFocusedStates(this);
     99     }
    100 
    101     private boolean isHotwordOn() {
    102         return mHotwordOn;
    103     }
    104 
    105     public void setHotwordState(boolean on) {
    106         if (on == mHotwordOn) {
    107             return;
    108         }
    109         mHotwordOn = on;
    110         refreshDrawableState();
    111     }
    112 
    113     @Override
    114     public int[] onCreateDrawableState(int extraSpace) {
    115         final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
    116         if (isHotwordOn()) {
    117             mergeDrawableStates(drawableState, new int[] {R.attr.stateHotwordOn});
    118         }
    119         return drawableState;
    120     }
    121 }
    122