mirror of
https://github.com/mozilla/gecko-dev.git
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369 lines
12 KiB
Java
369 lines
12 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.gecko.home;
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import org.mozilla.gecko.R;
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import org.mozilla.gecko.animation.PropertyAnimator;
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import org.mozilla.gecko.animation.ViewHelper;
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import org.mozilla.gecko.home.HomeAdapter.OnAddPanelListener;
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import org.mozilla.gecko.home.HomeConfig.PanelConfig;
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import org.mozilla.gecko.home.HomeConfig.PanelType;
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import org.mozilla.gecko.util.HardwareUtils;
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import android.content.Context;
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import android.graphics.drawable.Drawable;
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import android.os.Build;
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import android.os.Bundle;
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import android.support.v4.app.Fragment;
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import android.support.v4.app.FragmentManager;
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import android.support.v4.app.LoaderManager;
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import android.support.v4.app.LoaderManager.LoaderCallbacks;
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import android.support.v4.content.Loader;
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import android.support.v4.view.ViewPager;
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import android.view.ViewGroup.LayoutParams;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.ViewGroup;
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import android.view.View;
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import java.util.ArrayList;
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import java.util.EnumSet;
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import java.util.List;
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public class HomePager extends ViewPager {
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private static final int LOADER_ID_CONFIG = 0;
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private final Context mContext;
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private volatile boolean mLoaded;
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private Decor mDecor;
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private View mTabStrip;
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private final OnAddPanelListener mAddPanelListener;
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private final HomeConfig mConfig;
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private ConfigLoaderCallbacks mConfigLoaderCallbacks;
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private String mInitialPanelId;
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// Whether or not we need to restart the loader when we show the HomePager.
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private boolean mRestartLoader;
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// Cached original ViewPager background.
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private final Drawable mOriginalBackground;
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// This is mostly used by UI tests to easily fetch
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// specific list views at runtime.
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static final String LIST_TAG_HISTORY = "history";
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static final String LIST_TAG_BOOKMARKS = "bookmarks";
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static final String LIST_TAG_READING_LIST = "reading_list";
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static final String LIST_TAG_TOP_SITES = "top_sites";
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static final String LIST_TAG_MOST_RECENT = "most_recent";
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static final String LIST_TAG_LAST_TABS = "last_tabs";
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static final String LIST_TAG_BROWSER_SEARCH = "browser_search";
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public interface OnUrlOpenListener {
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public enum Flags {
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ALLOW_SWITCH_TO_TAB,
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OPEN_WITH_INTENT
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}
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public void onUrlOpen(String url, EnumSet<Flags> flags);
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}
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public interface OnNewTabsListener {
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public void onNewTabs(String[] urls);
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}
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interface OnTitleClickListener {
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public void onTitleClicked(int index);
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}
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/**
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* Special type of child views that could be added as pager decorations by default.
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*/
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interface Decor {
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public void onAddPagerView(String title);
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public void removeAllPagerViews();
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public void onPageSelected(int position);
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels);
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public void setOnTitleClickListener(OnTitleClickListener onTitleClickListener);
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}
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static final String CAN_LOAD_ARG = "canLoad";
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static final String PANEL_CONFIG_ARG = "panelConfig";
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public HomePager(Context context) {
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this(context, null);
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}
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public HomePager(Context context, AttributeSet attrs) {
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super(context, attrs);
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mContext = context;
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mConfig = HomeConfig.getDefault(mContext);
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mConfigLoaderCallbacks = new ConfigLoaderCallbacks();
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mAddPanelListener = new OnAddPanelListener() {
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@Override
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public void onAddPanel(String title) {
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if (mDecor != null) {
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mDecor.onAddPagerView(title);
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}
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}
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};
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// This is to keep all 4 panels in memory after they are
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// selected in the pager.
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setOffscreenPageLimit(3);
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// We can call HomePager.requestFocus to steal focus from the URL bar and drop the soft
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// keyboard. However, if there are no focusable views (e.g. an empty reading list), the
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// URL bar will be refocused. Therefore, we make the HomePager container focusable to
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// ensure there is always a focusable view. This would ordinarily be done via an XML
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// attribute, but it is not working properly.
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setFocusableInTouchMode(true);
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mOriginalBackground = getBackground();
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}
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@Override
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public void addView(View child, int index, ViewGroup.LayoutParams params) {
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if (child instanceof Decor) {
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((ViewPager.LayoutParams) params).isDecor = true;
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mDecor = (Decor) child;
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mTabStrip = child;
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mDecor.setOnTitleClickListener(new OnTitleClickListener() {
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@Override
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public void onTitleClicked(int index) {
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setCurrentItem(index, true);
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}
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});
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setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
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@Override
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public void onPageSelected(int position) {
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mDecor.onPageSelected(position);
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}
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@Override
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
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mDecor.onPageScrolled(position, positionOffset, positionOffsetPixels);
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}
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@Override
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public void onPageScrollStateChanged(int state) { }
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});
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} else if (child instanceof HomePagerTabStrip) {
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mTabStrip = child;
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}
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super.addView(child, index, params);
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}
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/**
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* Invalidates the current configuration, redisplaying the HomePager if necessary.
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*/
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public void invalidate(LoaderManager lm, FragmentManager fm) {
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// We need to restart the loader to load the new strings.
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mRestartLoader = true;
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// If the HomePager is currently visible, redisplay it with the new strings.
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if (isVisible()) {
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redisplay(lm, fm);
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}
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}
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private void redisplay(LoaderManager lm, FragmentManager fm) {
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final HomeAdapter adapter = (HomeAdapter) getAdapter();
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// If mInitialPanelId is non-null, this means the HomePager hasn't
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// finished loading its config yet. Simply re-show() with the
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// current target panel.
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final String currentPanelId;
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if (mInitialPanelId != null) {
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currentPanelId = mInitialPanelId;
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} else {
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currentPanelId = adapter.getPanelIdAtPosition(getCurrentItem());
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}
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show(lm, fm, currentPanelId, null);
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}
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/**
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* Loads and initializes the pager.
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*
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* @param fm FragmentManager for the adapter
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*/
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public void show(LoaderManager lm, FragmentManager fm, String panelId, PropertyAnimator animator) {
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mLoaded = true;
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mInitialPanelId = panelId;
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// Only animate on post-HC devices, when a non-null animator is given
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final boolean shouldAnimate = (animator != null && Build.VERSION.SDK_INT >= 11);
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final HomeAdapter adapter = new HomeAdapter(mContext, fm);
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adapter.setOnAddPanelListener(mAddPanelListener);
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adapter.setCanLoadHint(!shouldAnimate);
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setAdapter(adapter);
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setVisibility(VISIBLE);
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// Don't show the tabs strip until we have the
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// list of panels in place.
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mTabStrip.setVisibility(View.INVISIBLE);
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// Load list of panels from configuration. Restart the loader if necessary.
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if (mRestartLoader) {
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lm.restartLoader(LOADER_ID_CONFIG, null, mConfigLoaderCallbacks);
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mRestartLoader = false;
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} else {
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lm.initLoader(LOADER_ID_CONFIG, null, mConfigLoaderCallbacks);
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}
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if (shouldAnimate) {
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animator.addPropertyAnimationListener(new PropertyAnimator.PropertyAnimationListener() {
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@Override
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public void onPropertyAnimationStart() {
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setLayerType(View.LAYER_TYPE_HARDWARE, null);
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}
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@Override
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public void onPropertyAnimationEnd() {
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setLayerType(View.LAYER_TYPE_NONE, null);
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adapter.setCanLoadHint(true);
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}
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});
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ViewHelper.setAlpha(this, 0.0f);
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animator.attach(this,
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PropertyAnimator.Property.ALPHA,
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1.0f);
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}
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}
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/**
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* Hides the pager and removes all child fragments.
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*/
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public void hide() {
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mLoaded = false;
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setVisibility(GONE);
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setAdapter(null);
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}
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/**
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* Determines whether the pager is visible.
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*
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* Unlike getVisibility(), this method does not need to be called on the UI
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* thread.
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*
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* @return Whether the pager and its fragments are being displayed
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*/
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public boolean isVisible() {
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return mLoaded;
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}
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@Override
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public void setCurrentItem(int item, boolean smoothScroll) {
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super.setCurrentItem(item, smoothScroll);
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if (mDecor != null) {
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mDecor.onPageSelected(item);
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}
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent event) {
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if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
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// Drop the soft keyboard by stealing focus from the URL bar.
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requestFocus();
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}
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return super.onInterceptTouchEvent(event);
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}
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private void updateUiFromPanelConfigs(List<PanelConfig> panelConfigs) {
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// We only care about the adapter if HomePager is currently
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// loaded, which means it's visible in the activity.
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if (!mLoaded) {
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return;
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}
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if (mDecor != null) {
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mDecor.removeAllPagerViews();
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}
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final HomeAdapter adapter = (HomeAdapter) getAdapter();
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// Destroy any existing panels currently loaded
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// in the pager.
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setAdapter(null);
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// Only keep enabled panels.
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final List<PanelConfig> enabledPanels = new ArrayList<PanelConfig>();
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for (PanelConfig panelConfig : panelConfigs) {
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if (!panelConfig.isDisabled()) {
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enabledPanels.add(panelConfig);
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}
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}
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// Update the adapter with the new panel configs
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adapter.update(enabledPanels);
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final int count = enabledPanels.size();
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if (count == 0) {
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// Set firefox watermark as background.
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setBackgroundResource(R.drawable.home_pager_empty_state);
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// Hide the tab strip as there are no panels.
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mTabStrip.setVisibility(View.INVISIBLE);
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} else {
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mTabStrip.setVisibility(View.VISIBLE);
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// Restore original background.
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setBackgroundDrawable(mOriginalBackground);
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}
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// Re-install the adapter with the final state
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// in the pager.
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setAdapter(adapter);
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// Use the default panel as defined in the HomePager's configuration
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// if the initial panel wasn't explicitly set by the show() caller,
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// or if the initial panel is not found in the adapter.
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final int itemPosition = (mInitialPanelId == null) ? -1 : adapter.getItemPosition(mInitialPanelId);
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if (itemPosition > -1) {
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setCurrentItem(itemPosition, false);
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mInitialPanelId = null;
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} else {
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for (int i = 0; i < count; i++) {
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final PanelConfig panelConfig = enabledPanels.get(i);
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if (panelConfig.isDefault()) {
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setCurrentItem(i, false);
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break;
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}
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}
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}
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}
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private class ConfigLoaderCallbacks implements LoaderCallbacks<List<PanelConfig>> {
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@Override
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public Loader<List<PanelConfig>> onCreateLoader(int id, Bundle args) {
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return new HomeConfigLoader(mContext, mConfig);
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}
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@Override
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public void onLoadFinished(Loader<List<PanelConfig>> loader, List<PanelConfig> panelConfigs) {
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updateUiFromPanelConfigs(panelConfigs);
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}
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@Override
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public void onLoaderReset(Loader<List<PanelConfig>> loader) {
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}
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}
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}
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