src.com.android.setupwizardlib.view.Illustration Maven / Gradle / Ivy
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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.pm.ApplicationInfo;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.util.LayoutDirection;
import android.view.Gravity;
import android.view.ViewOutlineProvider;
import android.widget.FrameLayout;
import com.android.setupwizardlib.R;
/**
* Class to draw the illustration of setup wizard. The {@code aspectRatio} attribute determines the
* aspect ratio of the top padding, which leaves space for the illustration. Draws the illustration
* drawable to fit the width of the view and fills the rest with the background.
*
* If an aspect ratio is set, then the aspect ratio of the source drawable is maintained.
* Otherwise the aspect ratio will be ignored, only increasing the width of the illustration.
*/
public class Illustration extends FrameLayout {
// Size of the baseline grid in pixels
private float baselineGridSize;
private Drawable background;
private Drawable illustration;
private final Rect viewBounds = new Rect();
private final Rect illustrationBounds = new Rect();
private float scale = 1.0f;
private float aspectRatio = 0.0f;
public Illustration(Context context) {
super(context);
init(null, 0);
}
public Illustration(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
@TargetApi(VERSION_CODES.HONEYCOMB)
public Illustration(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs, defStyleAttr);
}
// All the constructors delegate to this init method. The 3-argument constructor is not
// available in FrameLayout before v11, so call super with the exact same arguments.
private void init(AttributeSet attrs, int defStyleAttr) {
if (attrs != null) {
TypedArray a =
getContext().obtainStyledAttributes(attrs, R.styleable.SuwIllustration, defStyleAttr, 0);
aspectRatio = a.getFloat(R.styleable.SuwIllustration_suwAspectRatio, 0.0f);
a.recycle();
}
// Number of pixels of the 8dp baseline grid as defined in material design specs
baselineGridSize = getResources().getDisplayMetrics().density * 8;
setWillNotDraw(false);
}
/**
* The background will be drawn to fill up the rest of the view. It will also be scaled by the
* same amount as the foreground so their textures look the same.
*/
// Override the deprecated setBackgroundDrawable method to support API < 16. View.setBackground
// forwards to setBackgroundDrawable in the framework implementation.
@SuppressWarnings("deprecation")
@Override
public void setBackgroundDrawable(Drawable background) {
if (background == this.background) {
return;
}
this.background = background;
invalidate();
requestLayout();
}
/**
* Sets the drawable used as the illustration. The drawable is expected to have intrinsic width
* and height defined and will be scaled to fit the width of the view.
*/
public void setIllustration(Drawable illustration) {
if (illustration == this.illustration) {
return;
}
this.illustration = illustration;
invalidate();
requestLayout();
}
/**
* Set the aspect ratio reserved for the illustration. This overrides the top padding of the view
* according to the width of this view and the aspect ratio. Children views will start being laid
* out below this aspect ratio.
*
* @param aspectRatio A float value specifying the aspect ratio (= width / height). 0 to not
* override the top padding.
*/
public void setAspectRatio(float aspectRatio) {
this.aspectRatio = aspectRatio;
invalidate();
requestLayout();
}
@Override
@Deprecated
public void setForeground(Drawable d) {
setIllustration(d);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (aspectRatio != 0.0f) {
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int illustrationHeight = (int) (parentWidth / aspectRatio);
illustrationHeight = (int) (illustrationHeight - (illustrationHeight % baselineGridSize));
setPadding(0, illustrationHeight, 0, 0);
}
if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
//noinspection AndroidLintInlinedApi
setOutlineProvider(ViewOutlineProvider.BOUNDS);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
final int layoutWidth = right - left;
final int layoutHeight = bottom - top;
if (illustration != null) {
int intrinsicWidth = illustration.getIntrinsicWidth();
int intrinsicHeight = illustration.getIntrinsicHeight();
viewBounds.set(0, 0, layoutWidth, layoutHeight);
if (aspectRatio != 0f) {
scale = layoutWidth / (float) intrinsicWidth;
intrinsicWidth = layoutWidth;
intrinsicHeight = (int) (intrinsicHeight * scale);
}
Gravity.apply(
Gravity.FILL_HORIZONTAL | Gravity.TOP,
intrinsicWidth,
intrinsicHeight,
viewBounds,
illustrationBounds);
illustration.setBounds(illustrationBounds);
}
if (background != null) {
// Scale the background bounds by the same scale to compensate for the scale done to the
// canvas in onDraw.
background.setBounds(
0,
0,
(int) Math.ceil(layoutWidth / scale),
(int) Math.ceil((layoutHeight - illustrationBounds.height()) / scale));
}
super.onLayout(changed, left, top, right, bottom);
}
@Override
public void onDraw(Canvas canvas) {
if (background != null) {
// Draw the background filling parts not covered by the illustration
canvas.save();
canvas.translate(0, illustrationBounds.height());
// Scale the background so its size matches the foreground
canvas.scale(scale, scale, 0, 0);
if (VERSION.SDK_INT > VERSION_CODES.JELLY_BEAN_MR1
&& shouldMirrorDrawable(background, getLayoutDirection())) {
// Flip the illustration for RTL layouts
canvas.scale(-1, 1);
canvas.translate(-background.getBounds().width(), 0);
}
background.draw(canvas);
canvas.restore();
}
if (illustration != null) {
canvas.save();
if (VERSION.SDK_INT > VERSION_CODES.JELLY_BEAN_MR1
&& shouldMirrorDrawable(illustration, getLayoutDirection())) {
// Flip the illustration for RTL layouts
canvas.scale(-1, 1);
canvas.translate(-illustrationBounds.width(), 0);
}
// Draw the illustration
illustration.draw(canvas);
canvas.restore();
}
super.onDraw(canvas);
}
private boolean shouldMirrorDrawable(Drawable drawable, int layoutDirection) {
if (layoutDirection == LayoutDirection.RTL) {
if (VERSION.SDK_INT >= VERSION_CODES.KITKAT) {
return drawable.isAutoMirrored();
} else if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR1) {
final int flags = getContext().getApplicationInfo().flags;
//noinspection AndroidLintInlinedApi
return (flags & ApplicationInfo.FLAG_SUPPORTS_RTL) != 0;
}
}
return false;
}
}