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/*
* Copyright (C) 2015 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.documentsui;
import static com.android.internal.util.Preconditions.checkArgument;
import android.app.Activity;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.support.v4.widget.DrawerLayout.DrawerListener;
import android.view.View;
import android.widget.Toolbar;
/**
* A facade over the various pieces comprising "roots fragment in a Drawer".
*
* @see DrawerController#create(DrawerLayout)
*/
abstract class DrawerController implements DrawerListener {
abstract void setOpen(boolean open);
abstract boolean isPresent();
abstract boolean isOpen();
abstract void setTitle(String title);
abstract void update();
/**
* Returns a controller suitable for {@code Layout}.
*/
static DrawerController create(Activity activity) {
DrawerLayout layout = (DrawerLayout) activity.findViewById(R.id.drawer_layout);
if (layout == null) {
return new DummyDrawerController();
}
View drawer = activity.findViewById(R.id.drawer_roots);
Toolbar toolbar = (Toolbar) activity.findViewById(R.id.roots_toolbar);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
activity,
layout,
R.drawable.ic_hamburger,
R.string.drawer_open,
R.string.drawer_close);
return new RuntimeDrawerController(layout, drawer, toggle, toolbar);
}
/**
* Returns a controller suitable for {@code Layout}.
*/
static DrawerController createDummy() {
return new DummyDrawerController();
}
/**
* Runtime controller that manages a real drawer.
*/
private static final class RuntimeDrawerController extends DrawerController {
private final ActionBarDrawerToggle mToggle;
private DrawerLayout mLayout;
private View mDrawer;
private Toolbar mToolbar;
public RuntimeDrawerController(
DrawerLayout layout, View drawer, ActionBarDrawerToggle toggle,
Toolbar drawerToolbar) {
mToolbar = drawerToolbar;
checkArgument(layout != null);
mLayout = layout;
mDrawer = drawer;
mToggle = toggle;
mLayout.setDrawerListener(this);
}
@Override
void setOpen(boolean open) {
if (open) {
mLayout.openDrawer(mDrawer);
} else {
mLayout.closeDrawer(mDrawer);
}
}
@Override
boolean isOpen() {
return mLayout.isDrawerOpen(mDrawer);
}
@Override
boolean isPresent() {
return true;
}
@Override
void setTitle(String title) {
mToolbar.setTitle(title);
}
@Override
void update() {
mToggle.syncState();
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
mToggle.onDrawerSlide(drawerView, slideOffset);
}
@Override
public void onDrawerOpened(View drawerView) {
mToggle.onDrawerOpened(drawerView);
}
@Override
public void onDrawerClosed(View drawerView) {
mToggle.onDrawerClosed(drawerView);
}
@Override
public void onDrawerStateChanged(int newState) {
mToggle.onDrawerStateChanged(newState);
}
}
/*
* Dummy controller useful with clients that don't host a real drawer.
*/
private static final class DummyDrawerController extends DrawerController {
@Override
void setOpen(boolean open) {}
@Override
boolean isOpen() {
return false;
}
@Override
boolean isPresent() {
return false;
}
@Override
void setTitle(String title) {}
@Override
void update() {}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {}
@Override
public void onDrawerOpened(View drawerView) {}
@Override
public void onDrawerClosed(View drawerView) {}
@Override
public void onDrawerStateChanged(int newState) {}
}
}
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