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package horstmann.ch05_layout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
/**
A layout manager that lays out components along a central axis
*/
public class FormLayout implements LayoutManager
{
public Dimension preferredLayoutSize(Container parent)
{
Component[] components = parent.getComponents();
left = 0;
right = 0;
height = 0;
for (int i = 0; i < components.length; i += 2)
{
Component cleft = components[i];
Component cright = components[i + 1];
Dimension dleft = cleft.getPreferredSize();
Dimension dright = cright.getPreferredSize();
left = Math.max(left, dleft.width);
right = Math.max(right, dright.width);
height = height + Math.max(dleft.height,
dright.height);
}
return new Dimension(left + GAP + right, height);
}
public Dimension minimumLayoutSize(Container parent)
{
return preferredLayoutSize(parent);
}
public void layoutContainer(Container parent)
{
preferredLayoutSize(parent); // Sets left, right
Component[] components = parent.getComponents();
Insets insets = parent.getInsets();
int xcenter = insets.left + left;
int y = insets.top;
for (int i = 0; i < components.length; i += 2)
{
Component cleft = components[i];
Component cright = components[i + 1];
Dimension dleft = cleft.getPreferredSize();
Dimension dright = cright.getPreferredSize();
int height = Math.max(dleft.height, dright.height);
cleft.setBounds(xcenter - dleft.width, y + (height
- dleft.height) / 2, dleft.width, dleft.height);
cright.setBounds(xcenter + GAP, y + (height
- dright.height) / 2, dright.width, dright.height);
y += height;
}
}
public void addLayoutComponent(String name, Component comp)
{}
public void removeLayoutComponent(Component comp)
{}
private int left;
private int right;
private int height;
private static final int GAP = 6;
}
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