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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.Canvas;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.WindowInsets;
import android.widget.FrameLayout;
import com.android.setupwizardlib.R;
/**
* A FrameLayout subclass that will responds to onApplyWindowInsets to draw a drawable in the top
* inset area, making a background effect for the navigation bar. To make use of this layout,
* specify the system UI visibility {@link android.view.View#SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and
* set specify fitsSystemWindows.
*
* <p>This view is a normal FrameLayout if either of those are not set, or if the platform version
* is lower than Lollipop.
*/
public class StatusBarBackgroundLayout extends FrameLayout {
private Drawable mStatusBarBackground;
private Object mLastInsets; // Use generic Object type for compatibility
public StatusBarBackgroundLayout(Context context) {
super(context);
init(context, null, 0);
}
public StatusBarBackgroundLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs, 0);
}
@TargetApi(VERSION_CODES.HONEYCOMB)
public StatusBarBackgroundLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs, defStyleAttr);
}
private void init(Context context, AttributeSet attrs, int defStyleAttr) {
final TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.SuwStatusBarBackgroundLayout, defStyleAttr, 0);
final Drawable statusBarBackground =
a.getDrawable(R.styleable.SuwStatusBarBackgroundLayout_suwStatusBarBackground);
setStatusBarBackground(statusBarBackground);
a.recycle();
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
if (mLastInsets == null) {
requestApplyInsets();
}
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
if (mLastInsets != null) {
final int insetTop = ((WindowInsets) mLastInsets).getSystemWindowInsetTop();
if (insetTop > 0) {
mStatusBarBackground.setBounds(0, 0, getWidth(), insetTop);
mStatusBarBackground.draw(canvas);
}
}
}
}
public void setStatusBarBackground(Drawable background) {
mStatusBarBackground = background;
if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
setWillNotDraw(background == null);
setFitsSystemWindows(background != null);
invalidate();
}
}
public Drawable getStatusBarBackground() {
return mStatusBarBackground;
}
@Override
public WindowInsets onApplyWindowInsets(WindowInsets insets) {
mLastInsets = insets;
return super.onApplyWindowInsets(insets);
}
}
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