/*
* Copyright 2014 Google Inc.
*
* 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.jakewharton.u2020.ui.debug;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.annotation.NonNull;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.widget.FrameLayout;
import com.jakewharton.u2020.R;
/**
* A layout that draws something in the insets passed to {@link #fitSystemWindows(Rect)}, i.e. the
* area above UI chrome (status and navigation bars, overlay action bars).
* <p>
* Unlike the {@code ScrimInsetsFrameLayout} in the design support library, this variant does not
* consume the insets.
*/
public final class NonConsumingScrimInsetsFrameLayout extends FrameLayout {
private Drawable insetForeground;
private Rect insets;
private Rect tempRect = new Rect();
public NonConsumingScrimInsetsFrameLayout(Context context) {
super(context);
init(context, null, 0);
}
public NonConsumingScrimInsetsFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs, 0);
}
public NonConsumingScrimInsetsFrameLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context, attrs, defStyle);
}
private void init(Context context, AttributeSet attrs, int defStyle) {
TypedArray a =
context.obtainStyledAttributes(attrs, R.styleable.NonConsumingScrimInsetsView, defStyle, 0);
if (a == null) {
return;
}
insetForeground = a.getDrawable(R.styleable.NonConsumingScrimInsetsView_insetForeground);
a.recycle();
setWillNotDraw(true);
}
@Override protected boolean fitSystemWindows(@NonNull Rect insets) {
this.insets = new Rect(insets);
setWillNotDraw(insetForeground == null);
ViewCompat.postInvalidateOnAnimation(this);
return false; // Do not consume insets.
}
@Override public void draw(@NonNull Canvas canvas) {
super.draw(canvas);
int width = getWidth();
int height = getHeight();
if (insets != null && insetForeground != null) {
int sc = canvas.save();
canvas.translate(getScrollX(), getScrollY());
// Top
tempRect.set(0, 0, width, insets.top);
insetForeground.setBounds(tempRect);
insetForeground.draw(canvas);
// Bottom
tempRect.set(0, height - insets.bottom, width, height);
insetForeground.setBounds(tempRect);
insetForeground.draw(canvas);
// Left
tempRect.set(0, insets.top, insets.left, height - insets.bottom);
insetForeground.setBounds(tempRect);
insetForeground.draw(canvas);
// Right
tempRect.set(width - insets.right, insets.top, width, height - insets.bottom);
insetForeground.setBounds(tempRect);
insetForeground.draw(canvas);
canvas.restoreToCount(sc);
}
}
@Override protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (insetForeground != null) {
insetForeground.setCallback(this);
}
}
@Override protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
if (insetForeground != null) {
insetForeground.setCallback(null);
}
}
}