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2531cbd Oct 14, 2015
132 lines (112 sloc) 4.35 KB
/*
* Copyright 2014 Google Inc. All rights reserved.
*
* 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.samples.apps.iosched.ui.widget;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.util.Property;
import android.widget.FrameLayout;
import com.google.samples.apps.iosched.R;
public class DrawShadowFrameLayout extends FrameLayout {
private Drawable mShadowDrawable;
private NinePatchDrawable mShadowNinePatchDrawable;
private int mShadowTopOffset;
private boolean mShadowVisible;
private int mWidth, mHeight;
private ObjectAnimator mAnimator;
private float mAlpha = 1f;
public DrawShadowFrameLayout(Context context) {
this(context, null, 0);
}
public DrawShadowFrameLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public DrawShadowFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
final TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.DrawShadowFrameLayout, 0, 0);
mShadowDrawable = a.getDrawable(R.styleable.DrawShadowFrameLayout_shadowDrawable);
if (mShadowDrawable != null) {
mShadowDrawable.setCallback(this);
if (mShadowDrawable instanceof NinePatchDrawable) {
mShadowNinePatchDrawable = (NinePatchDrawable) mShadowDrawable;
}
}
mShadowVisible = a.getBoolean(R.styleable.DrawShadowFrameLayout_shadowVisible, true);
setWillNotDraw(!mShadowVisible || mShadowDrawable == null);
a.recycle();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mWidth = w;
mHeight = h;
updateShadowBounds();
}
private void updateShadowBounds() {
if (mShadowDrawable != null) {
mShadowDrawable.setBounds(0, mShadowTopOffset, mWidth, mHeight);
}
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
if (mShadowDrawable != null && mShadowVisible) {
if (mShadowNinePatchDrawable != null) {
mShadowNinePatchDrawable.getPaint().setAlpha((int) (255 * mAlpha));
}
mShadowDrawable.draw(canvas);
}
}
public void setShadowTopOffset(int shadowTopOffset) {
this.mShadowTopOffset = shadowTopOffset;
updateShadowBounds();
ViewCompat.postInvalidateOnAnimation(this);
}
public void setShadowVisible(boolean shadowVisible, boolean animate) {
this.mShadowVisible = shadowVisible;
if (mAnimator != null) {
mAnimator.cancel();
mAnimator = null;
}
if (animate && mShadowDrawable != null) {
mAnimator = ObjectAnimator.ofFloat(this, SHADOW_ALPHA,
shadowVisible ? 0f : 1f,
shadowVisible ? 1f : 0f);
mAnimator.setDuration(1000);
mAnimator.start();
}
ViewCompat.postInvalidateOnAnimation(this);
setWillNotDraw(!mShadowVisible || mShadowDrawable == null);
}
private static Property<DrawShadowFrameLayout, Float> SHADOW_ALPHA
= new Property<DrawShadowFrameLayout, Float>(Float.class, "shadowAlpha") {
@Override
public Float get(DrawShadowFrameLayout dsfl) {
return dsfl.mAlpha;
}
@Override
public void set(DrawShadowFrameLayout dsfl, Float value) {
dsfl.mAlpha = value;
ViewCompat.postInvalidateOnAnimation(dsfl);
}
};
}