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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.setupwizardlib.view;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.ContextThemeWrapper;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import com.android.setupwizardlib.R;
public class NavigationBar extends LinearLayout implements View.OnClickListener {
public interface NavigationBarListener {
void onNavigateBack();
void onNavigateNext();
}
private static int getNavbarTheme(Context context) {
// Normally we can automatically guess the theme by comparing the foreground color against
// the background color. But we also allow specifying explicitly using suwNavBarTheme.
TypedArray attributes = context.obtainStyledAttributes(
new int[] {
R.attr.suwNavBarTheme,
android.R.attr.colorForeground,
android.R.attr.colorBackground });
int theme = attributes.getResourceId(0, 0);
if (theme == 0) {
// Compare the value of the foreground against the background color to see if current
// theme is light-on-dark or dark-on-light.
float[] foregroundHsv = new float[3];
float[] backgroundHsv = new float[3];
Color.colorToHSV(attributes.getColor(1, 0), foregroundHsv);
Color.colorToHSV(attributes.getColor(2, 0), backgroundHsv);
boolean isDarkBg = foregroundHsv[2] > backgroundHsv[2];
theme = isDarkBg ? R.style.SuwNavBarThemeDark : R.style.SuwNavBarThemeLight;
}
attributes.recycle();
return theme;
}
private static Context getThemedContext(Context context) {
final int theme = getNavbarTheme(context);
return new ContextThemeWrapper(context, theme);
}
private Button mNextButton;
private Button mBackButton;
private NavigationBarListener mListener;
public NavigationBar(Context context) {
super(getThemedContext(context));
init();
}
public NavigationBar(Context context, AttributeSet attrs) {
super(getThemedContext(context), attrs);
init();
}
@TargetApi(VERSION_CODES.HONEYCOMB)
public NavigationBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(getThemedContext(context), attrs, defStyleAttr);
init();
}
// All the constructors delegate to this init method. The 3-argument constructor is not
// available in LinearLayout before v11, so call super with the exact same arguments.
private void init() {
View.inflate(getContext(), R.layout.suw_navbar_view, this);
mNextButton = (Button) findViewById(R.id.suw_navbar_next);
mBackButton = (Button) findViewById(R.id.suw_navbar_back);
}
public Button getBackButton() {
return mBackButton;
}
public Button getNextButton() {
return mNextButton;
}
public void setNavigationBarListener(NavigationBarListener listener) {
mListener = listener;
if (mListener != null) {
getBackButton().setOnClickListener(this);
getNextButton().setOnClickListener(this);
}
}
@Override
public void onClick(View view) {
if (mListener != null) {
if (view == getBackButton()) {
mListener.onNavigateBack();
} else if (view == getNextButton()) {
mListener.onNavigateNext();
}
}
}
public static class NavButton extends Button {
public NavButton(Context context) {
super(context);
}
public NavButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
// The color of the button is #de000000 / #deffffff when enabled. When disabled, the
// alpha value = 0x3b/0xff * 0xde/0xff = 20%.
final int alpha = enabled ? 0xff : 0x3b;
setTextColor(getTextColors().withAlpha(alpha));
if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR1) {
final Drawable[] relativeDrawables = getCompoundDrawablesRelative();
for (Drawable d : relativeDrawables) {
if (d != null) {
d.mutate().setAlpha(alpha);
}
}
}
final Drawable[] compoundDrawables = getCompoundDrawables();
for (Drawable d : compoundDrawables) {
if (d != null) {
d.mutate().setAlpha(alpha);
}
}
}
}
}
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