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DiagonalLayout definition and customization
java code
import java.awt.*;
import java.util.Vector;

public class DiagonalLayout implements LayoutManager {

private int verticalDistance;
private int minWidth = 0, minHeight = 0;
private int preWidth = 0, preHeight = 0;
private boolean isSize = true;

public DiagonalLayout() {
this(5);
}

public DiagonalLayout(int v) {
verticalDistance = v;
}

/* override from LayoutManager. */
public void addLayoutComponent(String name, Component comp) {
}

/* override from LayoutManager. */
public void removeLayoutComponent(Component comp) {
}

private void setSizes(Container container) {
int countComp = container.countComponents();
Dimension newDim = null;

//Reset preferred/minimum width and height.
preWidth = 0;
preHeight = 0;
minWidth = 0;
minHeight = 0;

for (int i = 0; i < countComp; i++) {
Component c = container.getComponent(i);
if (c.isVisible()) {
newDim = c.preferredSize();

if (i > 0) {
preWidth += newDim.width/2;
preHeight += verticalDistance;
} else {
preWidth = newDim.width;
}
preHeight += newDim.height;

minWidth = Math.max(c.minimumSize().width, minWidth);
minHeight = preHeight;
}
}
}


/* override from LayoutManager. */
public Dimension preferredLayoutSize(Container container) {
Dimension dim = new Dimension(0, 0);
int countComp = container.countComponents();

setSizes(container);

//Always add the container's insets!
Insets insets = container.insets();
dim.width = preWidth + insets.left + insets.right;
dim.height = preHeight + insets.top + insets.bottom;

sizeUnknown = false;

return dim;
}

/* override from LayoutManager. */
public Dimension minLayoutSize(Container container) {
Dimension dim = new Dimension(0, 0);
int countComp = container.countComponents();

//Always add the container's insets!
Insets insets = container.insets();
dim.width = minWidth + insets.left + insets.right;
dim.height = minHeight + insets.top + insets.bottom;

sizeUnknown = false;

return dim;
}


/* This is called when the panel is first displayed,
* and every time its size changes.
*/
public void layoutContainer(Container container) {
Insets insets = container.insets();
int maxWidth = container.size().width
- (insets.left + insets.right);
int maxHeight = container.size().height
- (insets.top + insets.bottom);
int countComp = container.countComponents();
int previousWidth = 0, previousHeight = 0;
int x = 0, y = insets.top;
int rowh = 0, start = 0;
int xFudge = 0, yFudge = 0;
boolean oneColumn = false;

// Go through the components' sizes, if neither preferredLayoutSize()
// nor minLayoutSize() has been called.
if (sizeUnknown) {
setSizes(container);
}

if (maxWidth <= minWidth) {
oneColumn = true;
}

if (maxWidth != preWidth) {
xFudge = (maxWidth - preWidth)/(countComp - 1);
}

if (maxHeight > preHeight) {
yFudge = (maxHeight - preHeight)/(countComp - 1);
}

for (int i = 0 ; i < countComp ; i++) {
Component c = container.getComponent(i);
if (c.isVisible()) {
Dimension d = c.preferredSize();


if (i > 0) {
if (!oneColumn) {
//x += previousWidth - d.width/2 + xFudge;
x += previousWidth/2 + xFudge;
}
y += previousHeight + verticalDistance + yFudge;
}

// If x is too big, ...
if ((!oneColumn) &&
(x + d.width) > (container.size().width - insets.right)) {
// ... reduce x to a reasonable number.
x = container.size().width - insets.bottom - d.width;
}

// If y is too big, ...
if ((y + d.height) > (container.size().height - insets.bottom)) {
// ... do nothing.
// Another choice would be to do what we do to x.
}

// Set the component's size and position.
c.reshape(x, y, d.width, d.height);

previousWidth = d.width;
previousHeight = d.height;
}
}
}

public String toString() {
String str = "";
return getClass().getName() + "[verticalDistance=" + verticalDistance + str + "]";
}
}




_________________
M. S. Rakha, Ph.D.
Queen's University
Canada


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