app/src/main/java/me/zhanghai/android/douya/ui/ForegroundHelper.java

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/*
 * Copyright (c) 2015 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
 * All Rights Reserved.
 */

package me.zhanghai.android.douya.ui;

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.v4.graphics.drawable.DrawableCompat;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.TintTypedArray;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;

public class ForegroundHelper {

    //com.android.internal.R.attr.foregroundInsidePadding
    private static final int COM_ANDROID_INTERNAL_R_ATTR_FOREGROUND_INSIDE_PADDING = -300063;
    private static final int[] STYLEABLE = new int[] {
            android.R.attr.foreground,
            android.R.attr.foregroundGravity,
            COM_ANDROID_INTERNAL_R_ATTR_FOREGROUND_INSIDE_PADDING
    };
    private static final int STYLEABLE_ANDROID_FOREGROUND = 0;
    private static final int STYLEABLE_ANDROID_FOREGROUND_GRAVITY = 1;
    private static final int STYLEABLE_ANDROID_FOREGROUND_INSIDE_PADDING = 2;

    private Delegate mDelegate;

    private boolean mHasFrameworkBackground;

    private Drawable mForeground;

    private final Rect mSelfBounds = new Rect();
    private final Rect mOverlayBounds = new Rect();
    private int mForegroundGravity = Gravity.FILL;
    private boolean mForegroundInPadding = true;

    private boolean mForegroundBoundsChanged = false;

    public ForegroundHelper(Delegate delegate) {
        mDelegate = delegate;
    }

    public void init(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {

        // TODO: Check for FrameLayout
        mHasFrameworkBackground = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
                && context.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.M;

        if (mHasFrameworkBackground) {
            return;