chrome/android/java/src/org/chromium/chrome/browser/toolbar/bottom/BottomToolbarNewTabButton.java

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package org.chromium.chrome.browser.toolbar.bottom;

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.support.annotation.StringRes;
import android.support.graphics.drawable.VectorDrawableCompat;
import android.util.AttributeSet;

import org.chromium.base.ApiCompatibilityUtils;
import org.chromium.chrome.R;
import org.chromium.chrome.browser.ChromeFeatureList;
import org.chromium.chrome.browser.toolbar.IncognitoStateProvider;
import org.chromium.chrome.browser.toolbar.IncognitoStateProvider.IncognitoStateObserver;
import org.chromium.chrome.browser.toolbar.ThemeColorProvider;
import org.chromium.chrome.browser.toolbar.ThemeColorProvider.ThemeColorObserver;
import org.chromium.chrome.browser.util.ColorUtils;
import org.chromium.ui.widget.ChromeImageButton;

/**
 * The tab switcher new tab button.
 */
class BottomToolbarNewTabButton
        extends ChromeImageButton implements IncognitoStateObserver, ThemeColorObserver {
    /** The gray pill background behind the plus icon. */
    private final Drawable mBackground;

    /** The {@link Resources} used to compute the background color. */
    private final Resources mResources;

    /** A provider that notifies when incognito mode is entered or exited. */
    private IncognitoStateProvider mIncognitoStateProvider;

    /** A provider that notifies when the theme color changes.*/
    private ThemeColorProvider mThemeColorProvider;

    public BottomToolbarNewTabButton(Context context, AttributeSet attrs) {
        super(context, attrs);

        mResources = context.getResources();

        setImageDrawable(VectorDrawableCompat.create(
                getContext().getResources(), R.drawable.new_tab_icon, getContext().getTheme()));

        mBackground = ApiCompatibilityUtils.getDrawable(mResources, R.drawable.ntp_search_box);
        mBackground.mutate();
        setBackground(mBackground);
    }

    /**
     * Clean up any state when the new tab button is destroyed.
     */
    void destroy() {
        if (mIncognitoStateProvider != null) {
            mIncognitoStateProvider.removeObserver((IncognitoStateObserver) this);
            mIncognitoStateProvider = null;
        }
        if (mThemeColorProvider != null) {
            mThemeColorProvider.removeObserver(this);
            mThemeColorProvider = null;
        }
    }

    void setIncognitoStateProvider(IncognitoStateProvider incognitoStateProvider) {
        mIncognitoStateProvider = incognitoStateProvider;
        mIncognitoStateProvider.addObserver((IncognitoStateObserver) this);
    }

    @Override
    public void onIncognitoStateChanged(boolean isIncognito) {
        @StringRes
        int resId;
        if (ChromeFeatureList.isEnabled(ChromeFeatureList.INCOGNITO_STRINGS)) {
            resId = isIncognito ? R.string.accessibility_toolbar_btn_new_private_tab
                                : R.string.accessibility_toolbar_btn_new_tab;
        } else {
            resId = isIncognito ? R.string.accessibility_toolbar_btn_new_incognito_tab
                                : R.string.accessibility_toolbar_btn_new_tab;
        }
        setContentDescription(getResources().getText(resId));
    }

    void setThemeColorProvider(ThemeColorProvider themeColorProvider) {
        mThemeColorProvider = themeColorProvider;
        mThemeColorProvider.addObserver(this);
    }

    @Override
    public void onThemeColorChanged(ColorStateList tint, int primaryColor) {
        ApiCompatibilityUtils.setImageTintList(this, tint);
        mBackground.setColorFilter(
                ColorUtils.getTextBoxColorForToolbarBackground(mResources, false, primaryColor),
                PorterDuff.Mode.SRC_IN);
    }
}