PositionLayout

Postion Layout은 사용자 정의 레이아웃입니다.
사용법은 null 레이아웃으로 설정하여 setBounds를 이용하는 방법과 동일합니다.
하지만 Postion Layout은 위치를 퍼센트로 계산하기 때문에 크기 조정시 레이아웃에 포함된 컴포넌트의 크기가 조정됩니다.

PositionLayout.java

import java.awt.*;
import java.util.*;

public class PositionLayout implements LayoutManager {
    Vector  positions = new Vector(10);
    Vector  components = new Vector(10);
    private  boolean   leftRatio;
    private  boolean   topRatio;
    private  boolean   rightRatio;
    private  boolean   bottomRatio;

    public void addLayoutComponent(String p, Component c) {
        positions.addElement(p);
        components.addElement(c);
    }


    public void removeLayoutComponent(Component c) {

        int i = components.indexOf(c);
        if(i != -1) {
            positions.removeElementAt(i);
            components.removeElementAt(i);
        }
    }


    public Dimension preferredLayoutSize(Container parent) {
        Dimension dim = new Dimension(0,0);
        int ncomponents = parent.getComponentCount();
        Insets  insets = parent.getInsets();
        dim.width += insets.left + insets.right;
        dim.height += insets.top + insets.bottom;

        int maxW = dim.width;
        int maxH = dim.height;
        for(int i = 0; i < ncomponents; i++) {
            Component  com = parent.getComponent(i);
            if(com.isVisible() == false)
                continue;
            int  w = com.getPreferredSize().width + dim.width;
            int  h = com.getPreferredSize().height + dim.height;
            if( w > maxW )
                maxW = w;
            if( h > maxH )
                maxH = h;
        }
        //System.out.println("prefer Size: width="+maxW+"\t\theight="+maxH);
        return  new Dimension(maxW, maxH);
    }


    public Dimension minimumLayoutSize(Container target) {
        return  target.getSize();
    }


    public void layoutContainer(Container target) {
        Insets insets = target.getInsets();
        int    ncomponents = target.getComponentCount();
        Dimension d = target.getSize();
        d.width  -= insets.left + insets.right;
        d.height  -= insets.top + insets.bottom;
        int  startX =0, startY =0, endX =0, endY =0;
        int  left = 0, top =0, right = 0, bottom =0;
        for(int i=0; i< ncomponents; i++) {
            Component comp = target.getComponent(i);
         StringTokenizer token = new StringTokenizer((String)positions.elementAt(i), ", \t");
            String  leftSt = token.nextToken();
            if(leftSt.endsWith("%")) {
                leftRatio = true;
                left  = Integer.parseInt(leftSt.substring(0, leftSt.length()-1));
            } else {
                left  = Integer.parseInt(leftSt);
            }

            String  topSt = token.nextToken();
            if(topSt.endsWith("%")) {
                topRatio = true;
                top  = Integer.parseInt(topSt.substring(0, topSt.length()-1));
            } else {
                top  = Integer.parseInt(topSt);
            }

            String  rightSt = token.nextToken();
            if(rightSt.endsWith("%")) {
                rightRatio = true;
                right  = Integer.parseInt(rightSt.substring(0, rightSt.length()-1));
            } else {
                right  = Integer.parseInt(rightSt);
            }

            String  bottomSt = token.nextToken();
            if(bottomSt.endsWith("%")) {
                bottomRatio = true;
                bottom  = Integer.parseInt(bottomSt.substring(0, bottomSt.length()-1));
            } else {
                bottom  = Integer.parseInt(bottomSt);
            }

            if(leftRatio)
                startX = (d.width * left)/100;
            else
                startX = left;

            if(topRatio)
                startY = (d.height * top)/100;
            else
                startY = top;

            if(rightRatio)
                endX = (d.width * right)/100;
            else
                endX = right;

            if(bottomRatio)
                endY = (d.height * bottom)/100;
            else
                endY = bottom;

            if(startX > endX) {
                int temp = startX;
                startX = endX;
                endX = temp;
            }
            if(startY > endY) {
                int temp = startY;
                startY = endY;
                endY = temp;
            }
            int  w = endX - startX;
            int  h = endY - startY;
            comp.setBounds(startX+insets.left, startY+insets.top, w, h);
            topRatio = false;
            leftRatio = false;
            rightRatio = false;
            bottomRatio = false;
        }
    }

    public String toString() {
        return getClass().getName();
    }
}