Example usage for javax.swing SpringLayout getConstraint

Introduction

In this page you can find the example usage for javax.swing SpringLayout getConstraint.

Prototype

public Spring getConstraint(String edgeName, Component c) 

Source Link

Document

Returns the spring controlling the distance between the specified edge of the component and the top or left edge of its parent.

Usage

From source file:Main.java

public static void main(String[] args) {
    SpringLayout layout = new SpringLayout();
    JPanel p = new JPanel(layout);
    p.setBorder(BorderFactory.createLineBorder(Color.GREEN, 10));

    JLabel l1 = new JLabel("label: width=90%", SwingConstants.CENTER);
    l1.setBorder(BorderFactory.createLineBorder(Color.RED, 1));
    JButton l2 = new JButton("button: width=50%");

    Spring panelw = layout.getConstraint(WIDTH, p);

    SpringLayout.Constraints c1 = layout.getConstraints(l1);
    c1.setX(Spring.constant(0));// w ww.  jav  a2 s . co m
    c1.setY(Spring.constant(20));
    c1.setWidth(Spring.scale(panelw, 0.9f));
    p.add(l1);

    SpringLayout.Constraints c2 = layout.getConstraints(l2);
    c2.setWidth(Spring.scale(panelw, 0.5f));
    layout.putConstraint(SOUTH, l2, -20, SOUTH, p);
    layout.putConstraint(EAST, l2, -20, EAST, p);
    p.add(l2);

    JFrame f = new JFrame();
    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    f.getContentPane().add(p);
    f.setSize(320, 240);
    f.setVisible(true);
}

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From source file:CompassButtons.java

public CompassButtons(String terrain) {
    super("SpringLayout Compass Demo");
    setSize(500, 300);/*from  w  ww.j  a  v a 2s . c o  m*/
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    SpringLayout sl = new SpringLayout();
    Container c = getContentPane();
    c.setLayout(sl);

    int offset = 50; // gap between buttons and outside edge
    int w = 80; // width of buttons
    int h = 26; // height of buttons
    int border = 3; // border around viewport

    Spring offsetS = Spring.constant(offset);
    Spring borderS = Spring.constant(border);
    Spring widthS = Spring.constant(w);
    Spring halfWidthS = FractionSpring.half(widthS);
    Spring heightS = Spring.constant(h);
    Spring halfHeightS = FractionSpring.half(heightS);
    Spring leftEdgeS = sl.getConstraint(SpringLayout.WEST, c);
    Spring topEdgeS = sl.getConstraint(SpringLayout.NORTH, c);
    Spring rightEdgeS = sl.getConstraint(SpringLayout.EAST, c);
    Spring bottomEdgeS = sl.getConstraint(SpringLayout.SOUTH, c);
    Spring xCenterS = FractionSpring.half(rightEdgeS);
    Spring yCenterS = FractionSpring.half(bottomEdgeS);
    Spring leftBorder = Spring.sum(leftEdgeS, borderS);
    Spring topBorder = Spring.sum(topEdgeS, borderS);

    Spring northX = Spring.sum(xCenterS, Spring.minus(halfWidthS));
    Spring southY = Spring.sum(bottomEdgeS, Spring.minus(Spring.sum(heightS, offsetS)));
    Spring eastX = Spring.sum(rightEdgeS, Spring.minus(Spring.sum(widthS, offsetS)));
    Spring eastY = Spring.sum(yCenterS, Spring.minus(halfHeightS));

    c.add(nb, new SpringLayout.Constraints(northX, offsetS, widthS, heightS));
    c.add(sb, new SpringLayout.Constraints(northX, southY, widthS, heightS));

    c.add(wb);
    sl.getConstraints(wb).setX(offsetS);
    sl.getConstraints(wb).setY(eastY);
    sl.getConstraints(wb).setWidth(widthS);
    sl.getConstraints(wb).setHeight(heightS);

    c.add(eb);
    sl.getConstraints(eb).setX(eastX);
    sl.getConstraints(eb).setY(eastY);
    sl.getConstraints(eb).setWidth(widthS);
    sl.getConstraints(eb).setHeight(heightS);

    c.add(viewport); // this sets a bounds of (0,0,pref_width,pref_height)
    // The order here is important...need to have a valid width and height
    // in place before binding the (x,y) location
    sl.putConstraint(SpringLayout.SOUTH, viewport, Spring.minus(borderS), SpringLayout.SOUTH, c);
    sl.putConstraint(SpringLayout.EAST, viewport, Spring.minus(borderS), SpringLayout.EAST, c);
    sl.putConstraint(SpringLayout.NORTH, viewport, topBorder, SpringLayout.NORTH, c);
    sl.putConstraint(SpringLayout.WEST, viewport, leftBorder, SpringLayout.WEST, c);

    ImageIcon icon = new ImageIcon(getClass().getResource(terrain));
    viewport.setView(new JLabel(icon));

    // Hook up the buttons. See the CompassScroller class (on-line) for
    // details
    // on controlling the viewport.
    nb.setActionCommand(CompassScroller.NORTH);
    sb.setActionCommand(CompassScroller.SOUTH);
    wb.setActionCommand(CompassScroller.WEST);
    eb.setActionCommand(CompassScroller.EAST);
    CompassScroller scroller = new CompassScroller(viewport);
    nb.addActionListener(scroller);
    sb.addActionListener(scroller);
    eb.addActionListener(scroller);
    wb.addActionListener(scroller);

    setVisible(true);
}

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