1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.setupwizard.navigationbar;
18
19import android.app.Activity;
20import android.app.Fragment;
21import android.content.Context;
22import android.content.res.TypedArray;
23import android.graphics.Color;
24import android.os.Bundle;
25import android.util.AttributeSet;
26import android.view.ContextThemeWrapper;
27import android.view.LayoutInflater;
28import android.view.View;
29import android.view.View.OnClickListener;
30import android.view.ViewGroup;
31import android.view.ViewTreeObserver;
32import android.view.ViewTreeObserver.OnPreDrawListener;
33import android.widget.Button;
34
35/**
36 * Fragment class for controlling the custom navigation bar shown during setup wizard. Apps in the
37 * Android tree can use this by including the common.mk makefile. Apps outside of the tree can
38 * create a library project out of the source.
39 */
40public class SetupWizardNavBar extends Fragment implements OnPreDrawListener, OnClickListener {
41    private static final String TAG = "SetupWizardNavBar";
42    private static final int IMMERSIVE_FLAGS =
43            View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
44    private int mSystemUiFlags = IMMERSIVE_FLAGS | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
45
46    private ViewGroup mNavigationBarView;
47    private Button mNextButton;
48    private Button mBackButton;
49    private NavigationBarListener mCallback;
50
51    public interface NavigationBarListener {
52        public void onNavigationBarCreated(SetupWizardNavBar bar);
53        public void onNavigateBack();
54        public void onNavigateNext();
55    }
56
57    public SetupWizardNavBar() {
58        // no-arg constructor for fragments
59    }
60
61    @Override
62    public void onAttach(Activity activity) {
63        super.onAttach(activity);
64        mCallback = (NavigationBarListener) activity;
65    }
66
67    @Override
68    public View onCreateView(LayoutInflater inflater, ViewGroup container,
69            Bundle savedInstanceState) {
70        Context context = new ContextThemeWrapper(getActivity(), getNavbarTheme());
71        inflater = LayoutInflater.from(context);
72        mNavigationBarView = (ViewGroup) inflater.inflate(R.layout.setup_wizard_navbar_layout,
73                container, false);
74        mNextButton = (Button) mNavigationBarView.findViewById(R.id.setup_wizard_navbar_next);
75        mBackButton = (Button) mNavigationBarView.findViewById(R.id.setup_wizard_navbar_back);
76        mNextButton.setOnClickListener(this);
77        mBackButton.setOnClickListener(this);
78        return mNavigationBarView;
79    }
80
81    @Override
82    public void onViewCreated(View view, Bundle savedInstanceState) {
83        super.onViewCreated(view, savedInstanceState);
84        mCallback.onNavigationBarCreated(this);
85        mNavigationBarView.setSystemUiVisibility(mSystemUiFlags);
86
87        // Set the UI flags before draw because the visibility might change in unexpected /
88        // undetectable times, like transitioning from a finishing activity that had a keyboard
89        ViewTreeObserver viewTreeObserver = mNavigationBarView.getViewTreeObserver();
90        viewTreeObserver.addOnPreDrawListener(this);
91    }
92
93    @Override
94    public boolean onPreDraw() {
95        // View.setSystemUiVisibility checks if the visibility changes before applying them
96        // so the performance impact is contained
97        mNavigationBarView.setSystemUiVisibility(mSystemUiFlags);
98        return true;
99    }
100
101    /**
102     * Sets whether system navigation bar should be hidden.
103     * @param useImmersiveMode True to activate immersive mode and hide the system navigation bar
104     */
105    public void setUseImmersiveMode(boolean useImmersiveMode) {
106        // By default, enable layoutHideNavigation if immersive mode is used
107        setUseImmersiveMode(useImmersiveMode, useImmersiveMode);
108    }
109
110    public void setUseImmersiveMode(boolean useImmersiveMode, boolean layoutHideNavigation) {
111        if (useImmersiveMode) {
112            mSystemUiFlags |= IMMERSIVE_FLAGS;
113            if (layoutHideNavigation) {
114                mSystemUiFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
115            }
116        } else {
117            mSystemUiFlags &= ~(IMMERSIVE_FLAGS | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
118        }
119        mNavigationBarView.setSystemUiVisibility(mSystemUiFlags);
120    }
121
122    private int getNavbarTheme() {
123        // Normally we can automatically guess the theme by comparing the foreground color against
124        // the background color. But we also allow specifying explicitly using
125        // setup_wizard_navbar_theme.
126        TypedArray attributes = getActivity().obtainStyledAttributes(
127                new int[] {
128                        R.attr.setup_wizard_navbar_theme,
129                        android.R.attr.colorForeground,
130                        android.R.attr.colorBackground });
131        int theme = attributes.getResourceId(0, 0);
132        if (theme == 0) {
133            // Compare the value of the foreground against the background color to see if current
134            // theme is light-on-dark or dark-on-light.
135            float[] foregroundHsv = new float[3];
136            float[] backgroundHsv = new float[3];
137            Color.colorToHSV(attributes.getColor(1, 0), foregroundHsv);
138            Color.colorToHSV(attributes.getColor(2, 0), backgroundHsv);
139            boolean isDarkBg = foregroundHsv[2] > backgroundHsv[2];
140            theme = isDarkBg ? R.style.setup_wizard_navbar_theme_dark :
141                    R.style.setup_wizard_navbar_theme_light;
142        }
143        attributes.recycle();
144        return theme;
145    }
146
147    @Override
148    public void onClick(View v) {
149        if (v == mBackButton) {
150            mCallback.onNavigateBack();
151        } else if (v == mNextButton) {
152            mCallback.onNavigateNext();
153        }
154    }
155
156    public Button getBackButton() {
157        return mBackButton;
158    }
159
160    public Button getNextButton() {
161        return mNextButton;
162    }
163
164    public static class NavButton extends Button {
165
166        public NavButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
167            super(context, attrs, defStyleAttr, defStyleRes);
168        }
169
170        public NavButton(Context context, AttributeSet attrs, int defStyleAttr) {
171            super(context, attrs, defStyleAttr);
172        }
173
174        public NavButton(Context context, AttributeSet attrs) {
175            super(context, attrs);
176        }
177
178        public NavButton(Context context) {
179            super(context);
180        }
181
182        @Override
183        public void setEnabled(boolean enabled) {
184            super.setEnabled(enabled);
185            // The color of the button is #de000000 / #deffffff when enabled. When disabled, apply
186            // additional 23% alpha, so the overall opacity is 20%.
187            setAlpha(enabled ? 1.0f : 0.23f);
188        }
189    }
190
191}
192