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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
public class FlowLayout extends ViewGroup {
private int mSpacing;
public FlowLayout(Context context) {
super(context);
}
public FlowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, org.mozilla.gecko.R.styleable.FlowLayout);
mSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_spacing, (int) context.getResources().getDimension(R.dimen.flow_layout_spacing));
a.recycle();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
final int childCount = getChildCount();
int rowWidth = 0;
int totalWidth = 0;
int totalHeight = 0;
boolean firstChild = true;
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE)
continue;
measureChild(child, widthMeasureSpec, heightMeasureSpec);
final int childWidth = child.getMeasuredWidth();
final int childHeight = child.getMeasuredHeight();
if (firstChild || (rowWidth + childWidth > parentWidth)) {
rowWidth = 0;
totalHeight += childHeight;
if (!firstChild)
totalHeight += mSpacing;
firstChild = false;
}
rowWidth += childWidth;
if (rowWidth > totalWidth)
totalWidth = rowWidth;
rowWidth += mSpacing;
}
setMeasuredDimension(totalWidth, totalHeight);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int childCount = getChildCount();
final int totalWidth = r - l;
int x = 0;
int y = 0;
int prevChildHeight = 0;
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE)
continue;
final int childWidth = child.getMeasuredWidth();
final int childHeight = child.getMeasuredHeight();
if (x + childWidth > totalWidth) {
x = 0;
y += prevChildHeight + mSpacing;
}
prevChildHeight = childHeight;
child.layout(x, y, x + childWidth, y + childHeight);
x += childWidth + mSpacing;
}
}
}
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