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
17package com.android.launcher3;
18
19import android.content.Context;
20import android.content.res.TypedArray;
21import android.graphics.Canvas;
22import android.graphics.drawable.Drawable;
23import android.graphics.drawable.StateListDrawable;
24import android.util.AttributeSet;
25import android.view.MotionEvent;
26import android.view.View;
27import android.widget.ImageView;
28import android.widget.LinearLayout;
29
30public class HolographicLinearLayout extends LinearLayout {
31    private final HolographicViewHelper mHolographicHelper;
32    private ImageView mImageView;
33    private int mImageViewId;
34
35    private boolean mHotwordOn;
36    private boolean mIsPressed;
37    private boolean mIsFocused;
38
39    public HolographicLinearLayout(Context context) {
40        this(context, null);
41    }
42
43    public HolographicLinearLayout(Context context, AttributeSet attrs) {
44        this(context, attrs, 0);
45    }
46
47    public HolographicLinearLayout(Context context, AttributeSet attrs, int defStyle) {
48        super(context, attrs, defStyle);
49
50        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.HolographicLinearLayout,
51                defStyle, 0);
52        mImageViewId = a.getResourceId(R.styleable.HolographicLinearLayout_sourceImageViewId, -1);
53        mHotwordOn = a.getBoolean(R.styleable.HolographicLinearLayout_stateHotwordOn, false);
54        a.recycle();
55
56
57        setWillNotDraw(false);
58        mHolographicHelper = new HolographicViewHelper(context);
59
60        setOnTouchListener(new OnTouchListener() {
61            @Override
62            public boolean onTouch(View v, MotionEvent event) {
63                if (isPressed() != mIsPressed) {
64                    mIsPressed = isPressed();
65                    refreshDrawableState();
66                }
67                return false;
68            }
69        });
70
71        setOnFocusChangeListener(new OnFocusChangeListener() {
72            @Override
73            public void onFocusChange(View v, boolean hasFocus) {
74                if (isFocused() != mIsFocused) {
75                    mIsFocused = isFocused();
76                    refreshDrawableState();
77                }
78            }
79        });
80    }
81
82    @Override
83    protected void drawableStateChanged() {
84        super.drawableStateChanged();
85
86        if (mImageView != null) {
87            mHolographicHelper.generatePressedFocusedStates(mImageView);
88            Drawable d = mImageView.getDrawable();
89            if (d instanceof StateListDrawable) {
90                StateListDrawable sld = (StateListDrawable) d;
91                sld.setState(getDrawableState());
92                sld.invalidateSelf();
93            }
94        }
95    }
96
97    void invalidatePressedFocusedStates() {
98        mHolographicHelper.invalidatePressedFocusedStates(mImageView);
99        invalidate();
100    }
101
102    @Override
103    protected void onDraw(Canvas canvas) {
104        super.onDraw(canvas);
105
106        // One time call to generate the pressed/focused state -- must be called after
107        // measure/layout
108        if (mImageView == null) {
109            mImageView = (ImageView) findViewById(mImageViewId);
110        }
111        mHolographicHelper.generatePressedFocusedStates(mImageView);
112    }
113
114    private boolean isHotwordOn() {
115        return mHotwordOn;
116    }
117
118    public void setHotwordState(boolean on) {
119        if (on == mHotwordOn) {
120            return;
121        }
122        mHotwordOn = on;
123        refreshDrawableState();
124    }
125
126    @Override
127    public int[] onCreateDrawableState(int extraSpace) {
128        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
129        if (isHotwordOn()) {
130            mergeDrawableStates(drawableState, new int[] {R.attr.stateHotwordOn});
131        }
132        return drawableState;
133    }
134}
135