packages/SystemUI/src/com/android/systemui/BatteryMeterView.java

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.systemui;

import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Rect;
import android.util.ArraySet;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.android.systemui.statusbar.phone.StatusBarIconController;
import com.android.systemui.statusbar.policy.BatteryController;
import com.android.systemui.statusbar.policy.BatteryController.BatteryStateChangeCallback;
import com.android.systemui.statusbar.policy.ConfigurationController;
import com.android.systemui.statusbar.policy.ConfigurationController.ConfigurationListener;
import com.android.systemui.statusbar.policy.DarkIconDispatcher;
import com.android.systemui.statusbar.policy.DarkIconDispatcher.DarkReceiver;
import com.android.systemui.tuner.TunerService;
import com.android.systemui.tuner.TunerService.Tunable;

public class BatteryMeterView extends ImageView implements
        BatteryStateChangeCallback, Tunable, DarkReceiver, ConfigurationListener {

    private final BatteryMeterDrawable mDrawable;
    private final String mSlotBattery;
    private BatteryController mBatteryController;

    public BatteryMeterView(Context context) {
        this(context, null, 0);
    }

    public BatteryMeterView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public BatteryMeterView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        TypedArray atts = context.obtainStyledAttributes(attrs, R.styleable.BatteryMeterView,
                defStyle, 0);
        final int frameColor = atts.getColor(R.styleable.BatteryMeterView_frameColor,
                context.getColor(R.color.batterymeter_frame_color));
        mDrawable = new BatteryMeterDrawable(context, frameColor);
        atts.recycle();

        mSlotBattery = context.getString(
                com.android.internal.R.string.status_bar_battery);
        setImageDrawable(mDrawable);
    }

    @Override
    public boolean hasOverlappingRendering() {
        return false;
    }

    @Override
    public void onTuningChanged(String key, String newValue) {
        if (StatusBarIconController.ICON_BLACKLIST.equals(key)) {
            ArraySet<String> icons = StatusBarIconController.getIconBlacklist(newValue);
            setVisibility(icons.contains(mSlotBattery) ? View.GONE : View.VISIBLE);
        }
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        mBatteryController = Dependency.get(BatteryController.class);
        mDrawable.setBatteryController(mBatteryController);
        mBatteryController.addCallback(this);
        mDrawable.startListening();
        Dependency.get(TunerService.class).addTunable(this, StatusBarIconController.ICON_BLACKLIST);
        Dependency.get(ConfigurationController.class).addCallback(this);
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        mBatteryController.removeCallback(this);
        mDrawable.stopListening();
        Dependency.get(TunerService.class).removeTunable(this);
        Dependency.get(ConfigurationController.class).removeCallback(this);
    }

    @Override
    public void onBatteryLevelChanged(int level, boolean pluggedIn, boolean charging) {
        setContentDescription(
                getContext().getString(charging ? R.string.accessibility_battery_level_charging
                        : R.string.accessibility_battery_level, level));
    }

    @Override
    public void onPowerSaveChanged(boolean isPowerSave) {

    }

    @Override
    public void onDensityOrFontScaleChanged() {
        scaleBatteryMeterViews();
    }

    /**
     * Looks up the scale factor for status bar icons and scales the battery view by that amount.
     */
    private void scaleBatteryMeterViews() {
        Resources res = getContext().getResources();
        TypedValue typedValue = new TypedValue();

        res.getValue(R.dimen.status_bar_icon_scale_factor, typedValue, true);
        float iconScaleFactor = typedValue.getFloat();

        int batteryHeight = res.getDimensionPixelSize(R.dimen.status_bar_battery_icon_height);
        int batteryWidth = res.getDimensionPixelSize(R.dimen.status_bar_battery_icon_width);
        int marginBottom = res.getDimensionPixelSize(R.dimen.battery_margin_bottom);

        LinearLayout.LayoutParams scaledLayoutParams = new LinearLayout.LayoutParams(
                (int) (batteryWidth * iconScaleFactor), (int) (batteryHeight * iconScaleFactor));
        scaledLayoutParams.setMarginsRelative(0, 0, 0, marginBottom);

        setLayoutParams(scaledLayoutParams);
    }

    @Override
    public void onDarkChanged(Rect area, float darkIntensity, int tint) {
        mDrawable.setDarkIntensity(DarkIconDispatcher.isInArea(area, this) ? darkIntensity : 0);
    }

    public void setRawColors(int fgColor, int bgColor) {
        mDrawable.setColors(fgColor, bgColor);
    }
}