-/*
- * Copyright (C) 2009 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 org.altusmetrum.AltosDroid;
-
-import java.util.ArrayList;
-
-import android.content.Context;
-import android.os.Bundle;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentTransaction;
-import android.support.v4.app.FragmentActivity;
-import android.support.v4.app.FragmentPagerAdapter;
-import android.support.v4.view.ViewPager;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.TabHost;
-import android.widget.TabWidget;
-
-/**
- * This is a helper class that implements the management of tabs and all
- * details of connecting a ViewPager with associated TabHost. It relies on a
- * trick. Normally a tab host has a simple API for supplying a View or
- * Intent that each tab will show. This is not sufficient for switching
- * between pages. So instead we make the content part of the tab host
- * 0dp high (it is not shown) and the TabsAdapter supplies its own dummy
- * view to show as the tab content. It listens to changes in tabs, and takes
- * care of switch to the correct paged in the ViewPager whenever the selected
- * tab changes.
- */
-public class TabsAdapter extends FragmentPagerAdapter
- implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
- private final Context mContext;
- private final TabHost mTabHost;
- private final ViewPager mViewPager;
- private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
- private int position;
-
- static class TabInfo {
- private final String tag;
- private final Class<?> clss;
- private final Bundle args;
- private Fragment fragment;
-
- TabInfo(String _tag, Class<?> _class, Bundle _args) {
- tag = _tag;
- clss = _class;
- args = _args;
- }
- }
-
- static class DummyTabFactory implements TabHost.TabContentFactory {
- private final Context mContext;
-
- public DummyTabFactory(Context context) {
- mContext = context;
- }
-
- public View createTabContent(String tag) {
- View v = new View(mContext);
- v.setMinimumWidth(0);
- v.setMinimumHeight(0);
- return v;
- }
- }
-
- public TabsAdapter(FragmentActivity activity, TabHost tabHost, ViewPager pager) {
- super(activity.getSupportFragmentManager());
- mContext = activity;
- mTabHost = tabHost;
- mViewPager = pager;
- mTabHost.setOnTabChangedListener(this);
- mViewPager.setAdapter(this);
- mViewPager.setOnPageChangeListener(this);
- }
-
- public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
- tabSpec.setContent(new DummyTabFactory(mContext));
- String tag = tabSpec.getTag();
-
- TabInfo info = new TabInfo(tag, clss, args);
- mTabs.add(info);
- mTabHost.addTab(tabSpec);
- notifyDataSetChanged();
- }
-
- @Override
- public int getCount() {
- return mTabs.size();
- }
-
- @Override
- public Fragment getItem(int position) {
- TabInfo info = mTabs.get(position);
- AltosDebug.debug("TabsAdapter.getItem(%d)", position);
- info.fragment = Fragment.instantiate(mContext, info.clss.getName(), info.args);
- return info.fragment;
- }
-
- public Fragment currentItem() {
- TabInfo info = mTabs.get(position);
- return info.fragment;
- }
-
- public void onTabChanged(String tabId) {
- AltosDroidTab prev_frag = (AltosDroidTab) mTabs.get(position).fragment;
-
- position = mTabHost.getCurrentTab();
-
- AltosDroidTab cur_frag = (AltosDroidTab) mTabs.get(position).fragment;
-
- if (prev_frag != cur_frag) {
- if (prev_frag != null) {
- prev_frag.set_visible(false);
- }
- }
- if (cur_frag != null) {
- cur_frag.set_visible(true);
- }
- AltosDebug.debug("TabsAdapter.onTabChanged(%s) = %d", tabId, position);
- mViewPager.setCurrentItem(position);
- }
-
- public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
- }
-
- public void onPageSelected(int position) {
- // Unfortunately when TabHost changes the current tab, it kindly
- // also takes care of putting focus on it when not in touch mode.
- // The jerk.
- // This hack tries to prevent this from pulling focus out of our
- // ViewPager.
- TabWidget widget = mTabHost.getTabWidget();
- int oldFocusability = widget.getDescendantFocusability();
- widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
- mTabHost.setCurrentTab(position);
- widget.setDescendantFocusability(oldFocusability);
- }
-
- public void onPageScrollStateChanged(int state) {
- }
-}
projects / fw / altos / blobdiff