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/*
* Copyright (C) 2014 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.settings.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.ViewOutlineProvider;
import android.widget.FrameLayout;
import com.android.settings.R;
/**
* Class to draw the illustration of setup wizard. The aspectRatio attribute determines the aspect
* ratio of the top padding, which is leaving space for the illustration. Draws an illustration
* (foreground) to fit the width of the view and fills the rest with the background.
*
* Copied from com.google.android.setupwizard.util.SetupWizardIllustration
*/
public class SetupWizardIllustration extends FrameLayout {
private static final String TAG = "SetupWizardIllustration";
// Size of the baseline grid in pixels
private float mBaselineGridSize;
private Drawable mBackground;
private Drawable mForeground;
private final Rect mViewBounds = new Rect();
private final Rect mForegroundBounds = new Rect();
private float mScale = 1.0f;
private float mAspectRatio = 0.0f;
public SetupWizardIllustration(Context context) {
this(context, null);
}
public SetupWizardIllustration(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SetupWizardIllustration(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public SetupWizardIllustration(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
if (attrs != null) {
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.SetupWizardIllustration, 0, 0);
mAspectRatio = a.getFloat(R.styleable.SetupWizardIllustration_aspectRatio, 0.0f);
a.recycle();
}
// Number of pixels of the 8dp baseline grid as defined in material design specs
mBaselineGridSize = 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
public void setBackground(Drawable background) {
mBackground = background;
}
/**
* 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.
*/
@Override
public void setForeground(Drawable foreground) {
mForeground = foreground;
}
@Override
public void onResolveDrawables(int layoutDirection) {
mBackground.setLayoutDirection(layoutDirection);
mForeground.setLayoutDirection(layoutDirection);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mAspectRatio != 0.0f) {
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int illustrationHeight = (int) (parentWidth / mAspectRatio);
illustrationHeight -= illustrationHeight % mBaselineGridSize;
setPaddingRelative(0, illustrationHeight, 0, 0);
}
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 (mForeground != null) {
int intrinsicWidth = mForeground.getIntrinsicWidth();
int intrinsicHeight = mForeground.getIntrinsicHeight();
final int layoutDirection = getLayoutDirection();
mViewBounds.set(0, 0, layoutWidth, layoutHeight);
if (mAspectRatio != 0f) {
mScale = layoutWidth / (float) intrinsicWidth;
intrinsicWidth = layoutWidth;
intrinsicHeight = (int) (intrinsicHeight * mScale);
}
Gravity.apply(Gravity.FILL_HORIZONTAL | Gravity.TOP, intrinsicWidth, intrinsicHeight,
mViewBounds, mForegroundBounds, layoutDirection);
mForeground.setBounds(mForegroundBounds);
}
if (mBackground != null) {
// Scale the bounds by mScale to compensate for the scale done to the canvas before
// drawing.
mBackground.setBounds(0, 0, (int) Math.ceil(layoutWidth / mScale),
(int) Math.ceil((layoutHeight - mForegroundBounds.height()) / mScale));
}
super.onLayout(changed, left, top, right, bottom);
}
@Override
public void onDraw(Canvas canvas) {
if (mBackground != null) {
canvas.save();
// Draw the background filling parts not covered by the illustration
canvas.translate(0, mForegroundBounds.height());
// Scale the background so its size matches the foreground
canvas.scale(mScale, mScale, 0, 0);
mBackground.draw(canvas);
canvas.restore();
}
if (mForeground != null) {
canvas.save();
// Draw the illustration
mForeground.draw(canvas);
canvas.restore();
}
super.onDraw(canvas);
}
}
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