CenterLayout.java
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/*
* Copyright (C) 2012 YIXIA.COM
*
* 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 io.vov.vitamio.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RemoteViews.RemoteView;
@RemoteView
public class CenterLayout extends ViewGroup {
private int mPaddingLeft = 0;
private int mPaddingRight = 0;
private int mPaddingTop = 0;
private int mPaddingBottom = 0;
private int mWidth, mHeight;
public CenterLayout(Context context) {
super(context);
}
public CenterLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CenterLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int count = getChildCount();
int maxHeight = 0;
int maxWidth = 0;
measureChildren(widthMeasureSpec, heightMeasureSpec);
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child.getVisibility() != GONE) {
int childRight;
int childBottom;
CenterLayout.LayoutParams lp = (CenterLayout.LayoutParams) child.getLayoutParams();
childRight = lp.x + child.getMeasuredWidth();
childBottom = lp.y + child.getMeasuredHeight();
maxWidth = Math.max(maxWidth, childRight);
maxHeight = Math.max(maxHeight, childBottom);
}
}
maxWidth += mPaddingLeft + mPaddingRight;
maxHeight += mPaddingTop + mPaddingBottom;
maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight());
maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
setMeasuredDimension(resolveSize(maxWidth, widthMeasureSpec), resolveSize(maxHeight, heightMeasureSpec));
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int count = getChildCount();
mWidth = getMeasuredWidth();
mHeight = getMeasuredHeight();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child.getVisibility() != GONE) {
CenterLayout.LayoutParams lp = (CenterLayout.LayoutParams) child.getLayoutParams();
int childLeft = mPaddingLeft + lp.x;
if (lp.width > 0)
childLeft += (int) ((mWidth - lp.width) / 2.0);
else
childLeft += (int) ((mWidth - child.getMeasuredWidth()) / 2.0);
int childTop = mPaddingTop + lp.y;
if (lp.height > 0)
childTop += (int) ((mHeight - lp.height) / 2.0);
else
childTop += (int) ((mHeight - child.getMeasuredHeight()) / 2.0);
child.layout(childLeft, childTop, childLeft + child.getMeasuredWidth(), childTop + child.getMeasuredHeight());
}
}
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof CenterLayout.LayoutParams;
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p);
}
public static class LayoutParams extends ViewGroup.LayoutParams {
public int x;
public int y;
public LayoutParams(int width, int height, int x, int y) {
super(width, height);
this.x = x;
this.y = y;
}
public LayoutParams(ViewGroup.LayoutParams source) {
super(source);
}
}
}