| /* |
| * 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.google.android.setupdesign.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.google.android.setupdesign.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. |
| * |
| * <p>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 (isInEditMode()) { |
| return; |
| } |
| |
| if (attrs != null) { |
| TypedArray a = |
| getContext().obtainStyledAttributes(attrs, R.styleable.SudIllustration, defStyleAttr, 0); |
| aspectRatio = a.getFloat(R.styleable.SudIllustration_sudAspectRatio, 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; |
| } |
| } |