1 files changed, 221 insertions, 0 deletions
diff --git a/setupwizardlib/src/main/java/com/android/setupwizardlib/view/Illustration.java b/setupwizardlib/src/main/java/com/android/setupwizardlib/view/Illustration.java
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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.
+ *
+ * <p>If an aspect ratio is set, then the aspect ratio of the source drawable is maintained.
+ * Otherwise the 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 mBaselineGridSize;
+    private Drawable mBackground;
+    private Drawable mIllustration;
+    private final Rect mViewBounds = new Rect();
+    private final Rect mIllustrationBounds = new Rect();
+    private float mScale = 1.0f;
+    private float mAspectRatio = 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);
+            mAspectRatio = a.getFloat(R.styleable.SuwIllustration_suwAspectRatio, 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 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 == mBackground) {
+            return;
+        }
+        mBackground = 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 == mIllustration) {
+            return;
+        }
+        mIllustration = 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) {
+        mAspectRatio = aspectRatio;
+        invalidate();
+        requestLayout();
+    }
+
+    @Override
+    @Deprecated
+    public void setForeground(Drawable d) {
+        setIllustration(d);
+    }
+
+    @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;
+            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 (mIllustration != null) {
+            int intrinsicWidth = mIllustration.getIntrinsicWidth();
+            int intrinsicHeight = mIllustration.getIntrinsicHeight();
+
+            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, mIllustrationBounds);
+            mIllustration.setBounds(mIllustrationBounds);
+        }
+        if (mBackground != null) {
+            // Scale the background bounds by the same scale to compensate for the scale done to the
+            // canvas in onDraw.
+            mBackground.setBounds(0, 0, (int) Math.ceil(layoutWidth / mScale),
+                    (int) Math.ceil((layoutHeight - mIllustrationBounds.height()) / mScale));
+        }
+        super.onLayout(changed, left, top, right, bottom);
+    }
+
+    @Override
+    public void onDraw(Canvas canvas) {
+        if (mBackground != null) {
+            // Draw the background filling parts not covered by the illustration
+            canvas.save();
+            canvas.translate(0, mIllustrationBounds.height());
+            // Scale the background so its size matches the foreground
+            canvas.scale(mScale, mScale, 0, 0);
+            if (VERSION.SDK_INT > VERSION_CODES.JELLY_BEAN_MR1 &&
+                    shouldMirrorDrawable(mBackground, getLayoutDirection())) {
+                // Flip the illustration for RTL layouts
+                canvas.scale(-1, 1);
+                canvas.translate(-mBackground.getBounds().width(), 0);
+            }
+            mBackground.draw(canvas);
+            canvas.restore();
+        }
+        if (mIllustration != null) {
+            canvas.save();
+            if (VERSION.SDK_INT > VERSION_CODES.JELLY_BEAN_MR1 &&
+                    shouldMirrorDrawable(mIllustration, getLayoutDirection())) {
+                // Flip the illustration for RTL layouts
+                canvas.scale(-1, 1);
+                canvas.translate(-mIllustrationBounds.width(), 0);
+            }
+            // Draw the illustration
+            mIllustration.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;
+    }
+}