v7/cardview/eclair-mr1/android/support/v7/widget/RoundRectDrawableWithShadow.java - platform/frameworks/support.git - Git at Google

 /*
  * 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 android.support.v7.widget;

 import android.content.res.Resources;
 import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.LinearGradient;
 import android.graphics.Paint;
 import android.graphics.Path;
 import android.graphics.PixelFormat;
 import android.graphics.RadialGradient;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.Shader;
 import android.graphics.drawable.Drawable;
 import android.support.v7.cardview.R;

 /**
  * A rounded rectangle drawable which also includes a shadow around.
  */
 class RoundRectDrawableWithShadow extends Drawable {
     // used to calculate content padding
     final static double COS_45 = Math.cos(Math.toRadians(45));

     final static float SHADOW_MULTIPLIER = 1.5f;

     final int mInsetShadow; // extra shadow to avoid gaps between card and shadow

     /*
     * This helper is set by CardView implementations.
     * <p>
     * Prior to API 17, canvas.drawRoundRect is expensive; which is why we need this interface
     * to draw efficient rounded rectangles before 17.
     * */
     static RoundRectHelper sRoundRectHelper;

     Paint mPaint;

     Paint mCornerShadowPaint;

     Paint mEdgeShadowPaint;

     final RectF mCardBounds;

     float mCornerRadius;

     Path mCornerShadowPath;

     // updated value with inset
     float mMaxShadowSize;

     // actual value set by developer
     float mRawMaxShadowSize;

     // multiplied value to account for shadow offset
     float mShadowSize;

     // actual value set by developer
     float mRawShadowSize;

     private boolean mDirty = true;

     private final int mShadowStartColor;

     private final int mShadowEndColor;

     private boolean mAddPaddingForCorners = true;

     /**
      * If shadow size is set to a value above max shadow, we print a warning
      */
     private boolean mPrintedShadowClipWarning = false;

     RoundRectDrawableWithShadow(Resources resources, int backgroundColor, float radius,
             float shadowSize, float maxShadowSize) {
         mShadowStartColor = resources.getColor(R.color.cardview_shadow_start_color);
         mShadowEndColor = resources.getColor(R.color.cardview_shadow_end_color);
         mInsetShadow = resources.getDimensionPixelSize(R.dimen.cardview_compat_inset_shadow);
         mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
         mPaint.setColor(backgroundColor);
         mCornerShadowPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
         mCornerShadowPaint.setStyle(Paint.Style.FILL);
         mCornerRadius = (int) (radius + .5f);
         mCardBounds = new RectF();
         mEdgeShadowPaint = new Paint(mCornerShadowPaint);
         mEdgeShadowPaint.setAntiAlias(false);
         setShadowSize(shadowSize, maxShadowSize);
     }

     /**
      * Casts the value to an even integer.
      */
     private int toEven(float value) {
         int i = (int) (value + .5f);
         if (i % 2 == 1) {
             return i - 1;
         }
         return i;
     }

     public void setAddPaddingForCorners(boolean addPaddingForCorners) {
         mAddPaddingForCorners = addPaddingForCorners;
         invalidateSelf();
     }

     @Override
     public void setAlpha(int alpha) {
         mPaint.setAlpha(alpha);
         mCornerShadowPaint.setAlpha(alpha);
         mEdgeShadowPaint.setAlpha(alpha);
     }

     @Override
     protected void onBoundsChange(Rect bounds) {
         super.onBoundsChange(bounds);
         mDirty = true;
     }

     void setShadowSize(float shadowSize, float maxShadowSize) {
         if (shadowSize < 0f) {
             throw new IllegalArgumentException("Invalid shadow size " + shadowSize +
                     ". Must be >= 0");
         }
         if (maxShadowSize < 0f) {
             throw new IllegalArgumentException("Invalid max shadow size " + maxShadowSize +
                     ". Must be >= 0");
         }
         shadowSize = toEven(shadowSize);
         maxShadowSize = toEven(maxShadowSize);
         if (shadowSize > maxShadowSize) {
             shadowSize = maxShadowSize;
             if (!mPrintedShadowClipWarning) {
                 mPrintedShadowClipWarning = true;
             }
         }
         if (mRawShadowSize == shadowSize && mRawMaxShadowSize == maxShadowSize) {
             return;
         }
         mRawShadowSize = shadowSize;
         mRawMaxShadowSize = maxShadowSize;
         mShadowSize = (int)(shadowSize * SHADOW_MULTIPLIER + mInsetShadow + .5f);
         mMaxShadowSize = maxShadowSize + mInsetShadow;
         mDirty = true;
         invalidateSelf();
     }

     @Override
     public boolean getPadding(Rect padding) {
         int vOffset = (int) Math.ceil(calculateVerticalPadding(mRawMaxShadowSize, mCornerRadius,
                 mAddPaddingForCorners));
         int hOffset = (int) Math.ceil(calculateHorizontalPadding(mRawMaxShadowSize, mCornerRadius,
                 mAddPaddingForCorners));
         padding.set(hOffset, vOffset, hOffset, vOffset);
         return true;
     }

     static float calculateVerticalPadding(float maxShadowSize, float cornerRadius,
             boolean addPaddingForCorners) {
         if (addPaddingForCorners) {
             return (float) (maxShadowSize * SHADOW_MULTIPLIER + (1 - COS_45) * cornerRadius);
         } else {
             return maxShadowSize * SHADOW_MULTIPLIER;
         }
     }

     static float calculateHorizontalPadding(float maxShadowSize, float cornerRadius,
             boolean addPaddingForCorners) {
         if (addPaddingForCorners) {
             return (float) (maxShadowSize + (1 - COS_45) * cornerRadius);
         } else {
             return maxShadowSize;
         }
     }

     @Override
     public void setColorFilter(ColorFilter cf) {
         mPaint.setColorFilter(cf);
     }

     @Override
     public int getOpacity() {
         return PixelFormat.TRANSLUCENT;
     }

     void setCornerRadius(float radius) {
         if (radius < 0f) {
             throw new IllegalArgumentException("Invalid radius " + radius +
                 ". Must be >= 0");
         }
         radius = (int) (radius + .5f);
         if (mCornerRadius == radius) {
             return;
         }
         mCornerRadius = radius;
         mDirty = true;
         invalidateSelf();
     }

     @Override
     public void draw(Canvas canvas) {
         if (mDirty) {
             buildComponents(getBounds());
             mDirty = false;
         }
         canvas.translate(0, mRawShadowSize / 2);
         drawShadow(canvas);
         canvas.translate(0, -mRawShadowSize / 2);
         sRoundRectHelper.drawRoundRect(canvas, mCardBounds, mCornerRadius, mPaint);
     }

     private void drawShadow(Canvas canvas) {
         final float edgeShadowTop = -mCornerRadius - mShadowSize;
         final float inset = mCornerRadius + mInsetShadow + mRawShadowSize / 2;
         final boolean drawHorizontalEdges = mCardBounds.width() - 2 * inset > 0;
         final boolean drawVerticalEdges = mCardBounds.height() - 2 * inset > 0;
         // LT
         int saved = canvas.save();
         canvas.translate(mCardBounds.left + inset, mCardBounds.top + inset);
         canvas.drawPath(mCornerShadowPath, mCornerShadowPaint);
         if (drawHorizontalEdges) {
             canvas.drawRect(0, edgeShadowTop,
                     mCardBounds.width() - 2 * inset, -mCornerRadius,
                     mEdgeShadowPaint);
         }
         canvas.restoreToCount(saved);
         // RB
         saved = canvas.save();
         canvas.translate(mCardBounds.right - inset, mCardBounds.bottom - inset);
         canvas.rotate(180f);
         canvas.drawPath(mCornerShadowPath, mCornerShadowPaint);
         if (drawHorizontalEdges) {
             canvas.drawRect(0, edgeShadowTop,
                     mCardBounds.width() - 2 * inset, -mCornerRadius + mShadowSize,
                     mEdgeShadowPaint);
         }
         canvas.restoreToCount(saved);
         // LB
         saved = canvas.save();
         canvas.translate(mCardBounds.left + inset, mCardBounds.bottom - inset);
         canvas.rotate(270f);
         canvas.drawPath(mCornerShadowPath, mCornerShadowPaint);
         if (drawVerticalEdges) {
             canvas.drawRect(0, edgeShadowTop,
                     mCardBounds.height() - 2 * inset, -mCornerRadius, mEdgeShadowPaint);
         }
         canvas.restoreToCount(saved);
         // RT
         saved = canvas.save();
         canvas.translate(mCardBounds.right - inset, mCardBounds.top + inset);
         canvas.rotate(90f);
         canvas.drawPath(mCornerShadowPath, mCornerShadowPaint);
         if (drawVerticalEdges) {
             canvas.drawRect(0, edgeShadowTop,
                     mCardBounds.height() - 2 * inset, -mCornerRadius, mEdgeShadowPaint);
         }
         canvas.restoreToCount(saved);
     }

     private void buildShadowCorners() {
         RectF innerBounds = new RectF(-mCornerRadius, -mCornerRadius, mCornerRadius, mCornerRadius);
         RectF outerBounds = new RectF(innerBounds);
         outerBounds.inset(-mShadowSize, -mShadowSize);

         if (mCornerShadowPath == null) {
             mCornerShadowPath = new Path();
         } else {
             mCornerShadowPath.reset();
         }
         mCornerShadowPath.setFillType(Path.FillType.EVEN_ODD);
         mCornerShadowPath.moveTo(-mCornerRadius, 0);
         mCornerShadowPath.rLineTo(-mShadowSize, 0);
         // outer arc
         mCornerShadowPath.arcTo(outerBounds, 180f, 90f, false);
         // inner arc
         mCornerShadowPath.arcTo(innerBounds, 270f, -90f, false);
         mCornerShadowPath.close();
         float startRatio = mCornerRadius / (mCornerRadius + mShadowSize);
         mCornerShadowPaint.setShader(new RadialGradient(0, 0, mCornerRadius + mShadowSize,
                 new int[]{mShadowStartColor, mShadowStartColor, mShadowEndColor},
                 new float[]{0f, startRatio, 1f}
                 , Shader.TileMode.CLAMP));

         // we offset the content shadowSize/2 pixels up to make it more realistic.
         // this is why edge shadow shader has some extra space
         // When drawing bottom edge shadow, we use that extra space.
         mEdgeShadowPaint.setShader(new LinearGradient(0, -mCornerRadius + mShadowSize, 0,
                 -mCornerRadius - mShadowSize,
                 new int[]{mShadowStartColor, mShadowStartColor, mShadowEndColor},
                 new float[]{0f, .5f, 1f}, Shader.TileMode.CLAMP));
         mEdgeShadowPaint.setAntiAlias(false);
     }

     private void buildComponents(Rect bounds) {
         // Card is offset SHADOW_MULTIPLIER * maxShadowSize to account for the shadow shift.
         // We could have different top-bottom offsets to avoid extra gap above but in that case
         // center aligning Views inside the CardView would be problematic.
         final float verticalOffset = mRawMaxShadowSize * SHADOW_MULTIPLIER;
         mCardBounds.set(bounds.left + mRawMaxShadowSize, bounds.top + verticalOffset,
                 bounds.right - mRawMaxShadowSize, bounds.bottom - verticalOffset);
         buildShadowCorners();
     }

     float getCornerRadius() {
         return mCornerRadius;
     }

     void getMaxShadowAndCornerPadding(Rect into) {
         getPadding(into);
     }

     void setShadowSize(float size) {
         setShadowSize(size, mRawMaxShadowSize);
     }

     void setMaxShadowSize(float size) {
         setShadowSize(mRawShadowSize, size);
     }

     float getShadowSize() {
         return mRawShadowSize;
     }

     float getMaxShadowSize() {
         return mRawMaxShadowSize;
     }

     float getMinWidth() {
         final float content = 2 *
                 Math.max(mRawMaxShadowSize, mCornerRadius + mInsetShadow + mRawMaxShadowSize / 2);
         return content + (mRawMaxShadowSize + mInsetShadow) * 2;
     }

     float getMinHeight() {
         final float content = 2 * Math.max(mRawMaxShadowSize, mCornerRadius + mInsetShadow
                         + mRawMaxShadowSize * SHADOW_MULTIPLIER / 2);
         return content + (mRawMaxShadowSize * SHADOW_MULTIPLIER + mInsetShadow) * 2;
     }

     public void setColor(int color) {
         mPaint.setColor(color);
         invalidateSelf();
     }

     static interface RoundRectHelper {
         void drawRoundRect(Canvas canvas, RectF bounds, float cornerRadius, Paint paint);
     }
 }
	/*
	* 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 android.support.v7.widget;

	import android.content.res.Resources;
	import android.graphics.Canvas;
	import android.graphics.ColorFilter;
	import android.graphics.LinearGradient;
	import android.graphics.Paint;
	import android.graphics.Path;
	import android.graphics.PixelFormat;
	import android.graphics.RadialGradient;
	import android.graphics.Rect;
	import android.graphics.RectF;
	import android.graphics.Shader;
	import android.graphics.drawable.Drawable;
	import android.support.v7.cardview.R;

	/**
	* A rounded rectangle drawable which also includes a shadow around.
	*/
	class RoundRectDrawableWithShadow extends Drawable {
	// used to calculate content padding
	final static double COS_45 = Math.cos(Math.toRadians(45));

	final static float SHADOW_MULTIPLIER = 1.5f;

	final int mInsetShadow; // extra shadow to avoid gaps between card and shadow

	/*
	* This helper is set by CardView implementations.
	* <p>
	* Prior to API 17, canvas.drawRoundRect is expensive; which is why we need this interface
	* to draw efficient rounded rectangles before 17.
	* */
	static RoundRectHelper sRoundRectHelper;

	Paint mPaint;

	Paint mCornerShadowPaint;

	Paint mEdgeShadowPaint;

	final RectF mCardBounds;

	float mCornerRadius;

	Path mCornerShadowPath;

	// updated value with inset
	float mMaxShadowSize;

	// actual value set by developer
	float mRawMaxShadowSize;

	// multiplied value to account for shadow offset
	float mShadowSize;

	// actual value set by developer
	float mRawShadowSize;

	private boolean mDirty = true;

	private final int mShadowStartColor;

	private final int mShadowEndColor;

	private boolean mAddPaddingForCorners = true;

	/**
	* If shadow size is set to a value above max shadow, we print a warning
	*/
	private boolean mPrintedShadowClipWarning = false;

	RoundRectDrawableWithShadow(Resources resources, int backgroundColor, float radius,
	float shadowSize, float maxShadowSize) {
	mShadowStartColor = resources.getColor(R.color.cardview_shadow_start_color);
	mShadowEndColor = resources.getColor(R.color.cardview_shadow_end_color);
	mInsetShadow = resources.getDimensionPixelSize(R.dimen.cardview_compat_inset_shadow);
	mPaint = new Paint(Paint.ANTI_ALIAS_FLAG \| Paint.DITHER_FLAG);
	mPaint.setColor(backgroundColor);
	mCornerShadowPaint = new Paint(Paint.ANTI_ALIAS_FLAG \| Paint.DITHER_FLAG);
	mCornerShadowPaint.setStyle(Paint.Style.FILL);
	mCornerRadius = (int) (radius + .5f);
	mCardBounds = new RectF();
	mEdgeShadowPaint = new Paint(mCornerShadowPaint);
	mEdgeShadowPaint.setAntiAlias(false);
	setShadowSize(shadowSize, maxShadowSize);
	}

	/**
	* Casts the value to an even integer.
	*/
	private int toEven(float value) {
	int i = (int) (value + .5f);
	if (i % 2 == 1) {
	return i - 1;
	}
	return i;
	}

	public void setAddPaddingForCorners(boolean addPaddingForCorners) {
	mAddPaddingForCorners = addPaddingForCorners;
	invalidateSelf();
	}

	@Override
	public void setAlpha(int alpha) {
	mPaint.setAlpha(alpha);
	mCornerShadowPaint.setAlpha(alpha);
	mEdgeShadowPaint.setAlpha(alpha);
	}

	@Override
	protected void onBoundsChange(Rect bounds) {
	super.onBoundsChange(bounds);
	mDirty = true;
	}

	void setShadowSize(float shadowSize, float maxShadowSize) {
	if (shadowSize < 0f) {
	throw new IllegalArgumentException("Invalid shadow size " + shadowSize +
	". Must be >= 0");
	}
	if (maxShadowSize < 0f) {
	throw new IllegalArgumentException("Invalid max shadow size " + maxShadowSize +
	". Must be >= 0");
	}
	shadowSize = toEven(shadowSize);
	maxShadowSize = toEven(maxShadowSize);
	if (shadowSize > maxShadowSize) {
	shadowSize = maxShadowSize;
	if (!mPrintedShadowClipWarning) {
	mPrintedShadowClipWarning = true;
	}
	}
	if (mRawShadowSize == shadowSize && mRawMaxShadowSize == maxShadowSize) {
	return;
	}
	mRawShadowSize = shadowSize;
	mRawMaxShadowSize = maxShadowSize;
	mShadowSize = (int)(shadowSize * SHADOW_MULTIPLIER + mInsetShadow + .5f);
	mMaxShadowSize = maxShadowSize + mInsetShadow;
	mDirty = true;
	invalidateSelf();
	}

	@Override
	public boolean getPadding(Rect padding) {
	int vOffset = (int) Math.ceil(calculateVerticalPadding(mRawMaxShadowSize, mCornerRadius,
	mAddPaddingForCorners));
	int hOffset = (int) Math.ceil(calculateHorizontalPadding(mRawMaxShadowSize, mCornerRadius,
	mAddPaddingForCorners));
	padding.set(hOffset, vOffset, hOffset, vOffset);
	return true;
	}

	static float calculateVerticalPadding(float maxShadowSize, float cornerRadius,
	boolean addPaddingForCorners) {
	if (addPaddingForCorners) {
	return (float) (maxShadowSize * SHADOW_MULTIPLIER + (1 - COS_45) * cornerRadius);
	} else {
	return maxShadowSize * SHADOW_MULTIPLIER;
	}
	}

	static float calculateHorizontalPadding(float maxShadowSize, float cornerRadius,
	boolean addPaddingForCorners) {
	if (addPaddingForCorners) {
	return (float) (maxShadowSize + (1 - COS_45) * cornerRadius);
	} else {
	return maxShadowSize;
	}
	}

	@Override
	public void setColorFilter(ColorFilter cf) {
	mPaint.setColorFilter(cf);
	}

	@Override
	public int getOpacity() {
	return PixelFormat.TRANSLUCENT;
	}

	void setCornerRadius(float radius) {
	if (radius < 0f) {
	throw new IllegalArgumentException("Invalid radius " + radius +
	". Must be >= 0");
	}
	radius = (int) (radius + .5f);
	if (mCornerRadius == radius) {
	return;
	}
	mCornerRadius = radius;
	mDirty = true;
	invalidateSelf();
	}

	@Override
	public void draw(Canvas canvas) {
	if (mDirty) {
	buildComponents(getBounds());
	mDirty = false;
	}
	canvas.translate(0, mRawShadowSize / 2);
	drawShadow(canvas);
	canvas.translate(0, -mRawShadowSize / 2);
	sRoundRectHelper.drawRoundRect(canvas, mCardBounds, mCornerRadius, mPaint);
	}

	private void drawShadow(Canvas canvas) {
	final float edgeShadowTop = -mCornerRadius - mShadowSize;
	final float inset = mCornerRadius + mInsetShadow + mRawShadowSize / 2;
	final boolean drawHorizontalEdges = mCardBounds.width() - 2 * inset > 0;
	final boolean drawVerticalEdges = mCardBounds.height() - 2 * inset > 0;
	// LT
	int saved = canvas.save();
	canvas.translate(mCardBounds.left + inset, mCardBounds.top + inset);
	canvas.drawPath(mCornerShadowPath, mCornerShadowPaint);
	if (drawHorizontalEdges) {
	canvas.drawRect(0, edgeShadowTop,
	mCardBounds.width() - 2 * inset, -mCornerRadius,
	mEdgeShadowPaint);
	}
	canvas.restoreToCount(saved);
	// RB
	saved = canvas.save();
	canvas.translate(mCardBounds.right - inset, mCardBounds.bottom - inset);
	canvas.rotate(180f);
	canvas.drawPath(mCornerShadowPath, mCornerShadowPaint);
	if (drawHorizontalEdges) {
	canvas.drawRect(0, edgeShadowTop,
	mCardBounds.width() - 2 * inset, -mCornerRadius + mShadowSize,
	mEdgeShadowPaint);
	}
	canvas.restoreToCount(saved);
	// LB
	saved = canvas.save();
	canvas.translate(mCardBounds.left + inset, mCardBounds.bottom - inset);
	canvas.rotate(270f);
	canvas.drawPath(mCornerShadowPath, mCornerShadowPaint);
	if (drawVerticalEdges) {
	canvas.drawRect(0, edgeShadowTop,
	mCardBounds.height() - 2 * inset, -mCornerRadius, mEdgeShadowPaint);
	}
	canvas.restoreToCount(saved);
	// RT
	saved = canvas.save();
	canvas.translate(mCardBounds.right - inset, mCardBounds.top + inset);
	canvas.rotate(90f);
	canvas.drawPath(mCornerShadowPath, mCornerShadowPaint);
	if (drawVerticalEdges) {
	canvas.drawRect(0, edgeShadowTop,
	mCardBounds.height() - 2 * inset, -mCornerRadius, mEdgeShadowPaint);
	}
	canvas.restoreToCount(saved);
	}

	private void buildShadowCorners() {
	RectF innerBounds = new RectF(-mCornerRadius, -mCornerRadius, mCornerRadius, mCornerRadius);
	RectF outerBounds = new RectF(innerBounds);
	outerBounds.inset(-mShadowSize, -mShadowSize);

	if (mCornerShadowPath == null) {
	mCornerShadowPath = new Path();
	} else {
	mCornerShadowPath.reset();
	}
	mCornerShadowPath.setFillType(Path.FillType.EVEN_ODD);
	mCornerShadowPath.moveTo(-mCornerRadius, 0);
	mCornerShadowPath.rLineTo(-mShadowSize, 0);
	// outer arc
	mCornerShadowPath.arcTo(outerBounds, 180f, 90f, false);
	// inner arc
	mCornerShadowPath.arcTo(innerBounds, 270f, -90f, false);
	mCornerShadowPath.close();
	float startRatio = mCornerRadius / (mCornerRadius + mShadowSize);
	mCornerShadowPaint.setShader(new RadialGradient(0, 0, mCornerRadius + mShadowSize,
	new int[]{mShadowStartColor, mShadowStartColor, mShadowEndColor},
	new float[]{0f, startRatio, 1f}
	, Shader.TileMode.CLAMP));

	// we offset the content shadowSize/2 pixels up to make it more realistic.
	// this is why edge shadow shader has some extra space
	// When drawing bottom edge shadow, we use that extra space.
	mEdgeShadowPaint.setShader(new LinearGradient(0, -mCornerRadius + mShadowSize, 0,
	-mCornerRadius - mShadowSize,
	new int[]{mShadowStartColor, mShadowStartColor, mShadowEndColor},
	new float[]{0f, .5f, 1f}, Shader.TileMode.CLAMP));
	mEdgeShadowPaint.setAntiAlias(false);
	}

	private void buildComponents(Rect bounds) {
	// Card is offset SHADOW_MULTIPLIER * maxShadowSize to account for the shadow shift.
	// We could have different top-bottom offsets to avoid extra gap above but in that case
	// center aligning Views inside the CardView would be problematic.
	final float verticalOffset = mRawMaxShadowSize * SHADOW_MULTIPLIER;
	mCardBounds.set(bounds.left + mRawMaxShadowSize, bounds.top + verticalOffset,
	bounds.right - mRawMaxShadowSize, bounds.bottom - verticalOffset);
	buildShadowCorners();
	}

	float getCornerRadius() {
	return mCornerRadius;
	}

	void getMaxShadowAndCornerPadding(Rect into) {
	getPadding(into);
	}

	void setShadowSize(float size) {
	setShadowSize(size, mRawMaxShadowSize);
	}

	void setMaxShadowSize(float size) {
	setShadowSize(mRawShadowSize, size);
	}

	float getShadowSize() {
	return mRawShadowSize;
	}

	float getMaxShadowSize() {
	return mRawMaxShadowSize;
	}

	float getMinWidth() {
	final float content = 2 *
	Math.max(mRawMaxShadowSize, mCornerRadius + mInsetShadow + mRawMaxShadowSize / 2);
	return content + (mRawMaxShadowSize + mInsetShadow) * 2;
	}

	float getMinHeight() {
	final float content = 2 * Math.max(mRawMaxShadowSize, mCornerRadius + mInsetShadow
	+ mRawMaxShadowSize * SHADOW_MULTIPLIER / 2);
	return content + (mRawMaxShadowSize * SHADOW_MULTIPLIER + mInsetShadow) * 2;
	}

	public void setColor(int color) {
	mPaint.setColor(color);
	invalidateSelf();
	}

	static interface RoundRectHelper {
	void drawRoundRect(Canvas canvas, RectF bounds, float cornerRadius, Paint paint);
	}
	}