import java.lang.Math;
import android.view.View;
import android.view.ViewGroup;
import android.content.Context;
import android.util.AttributeSet;
public class SideLayout extends ViewGroup {
private int max_wid, max_hgt;
public SideLayout(Context ctx) {
super(ctx);
}
public SideLayout(Context ctx, AttributeSet attrs) {
super(ctx, attrs);
}
public SideLayout(Context ctx, AttributeSet attrs, int defStyle) {
super(ctx, attrs, defStyle);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
final int num_children = getChildCount();
// Since this is a special-purpose widget, this is brute simple. All
// of our children will have sizes of wrap_content, so we query them
// all, then make a second pass assigning their final sizes.
max_wid = 0;
max_hgt = 0;
for( int i = 0; i < num_children; ++i )
{
final View child = getChildAt(i);
if( child != null && child.getVisibility() != View.GONE )
{
measureChild(child, widthMeasureSpec, heightMeasureSpec);
max_wid = Math.max(max_wid, child.getMeasuredWidth());
max_hgt = Math.max(max_hgt, child.getMeasuredHeight());
}
}
// Make a second pass, tell children the actual size they got.
for( int i = 0; i < num_children; ++i )
{
final View child = getChildAt(i);
if( child != null && child.getVisibility() != View.GONE )
{
child.measure(
MeasureSpec.makeMeasureSpec(max_wid, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(max_hgt, MeasureSpec.EXACTLY));
}
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
final int num_children = getChildCount();
int x,y;
if( num_children <= 0 )
return;
// Split the children into two groups, left and right. Each
// column is evenly-spaced.
int wid = r - l;
int hgt = b - t;
int nrow = (num_children + 1) / 2;
int margin = (hgt - max_hgt * nrow) / (nrow + 1);
int i = 0;
for( int col = 0; col < 2; ++col ) {
x = col == 0 ? 0 : wid - max_wid;
y = margin;
for( int row = 0; row < nrow; ++row, ++i ) {
if( i < num_children ) {
final View child = getChildAt(i);
if( child != null && child.getVisibility() != View.GONE )
child.layout(x, y, x+max_wid, y+max_hgt);
}
y += margin + max_hgt;
}
}
}
}