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package gjt;
import java.awt.*;
/**
* ColumnLayout lays out components in a column. At
* construction time, both horizontal orientation and vertical
* orientation may be specified, along with the gap to use
* between components.<p>
*
* Horizontal orientation must be one of the following:
* <dl>
* <dd> LEFT
* <dd> CENTER
* <dd> RIGHT
* </dl>
*
* Vertical orientation must be one of the following:
* <dl>
* <dd> TOP
* <dd> CENTER
* <dd> BOTTOM
* </dl>
*
* @version 1.0, Apr 1 1996
* @author David Geary
* @see Orientation
* @see RowLayout
*/
public class ColumnLayout implements LayoutManager {
static private int _defaultGap = 5;
private int gap;
private Orientation horizontalOrientation;
private Orientation verticalOrientation;
public ColumnLayout() {
this(Orientation.CENTER,
Orientation.CENTER, _defaultGap);
}
public ColumnLayout(int gap) {
this(Orientation.CENTER, Orientation.CENTER, gap);
}
public ColumnLayout(Orientation horizontalOrient,
Orientation verticalOrient) {
this(horizontalOrient, verticalOrient, _defaultGap);
}
public ColumnLayout(Orientation horizontalOrient,
Orientation verticalOrient, int gap) {
Assert.notFalse(gap >= 0);
Assert.notFalse(
horizontalOrient == Orientation.LEFT ||
horizontalOrient == Orientation.CENTER ||
horizontalOrient == Orientation.RIGHT);
Assert.notFalse(
verticalOrient == Orientation.TOP ||
verticalOrient == Orientation.CENTER ||
verticalOrient == Orientation.BOTTOM);
this.gap = gap;
this.verticalOrientation = verticalOrient;
this.horizontalOrientation = horizontalOrient;
}
public void addLayoutComponent(String name,
Component comp) {
}
public void removeLayoutComponent(Component comp) {
}
public Dimension preferredLayoutSize(Container target) {
Insets insets = target.insets();
Dimension dim = new Dimension(0,0);
int ncomponents = target.countComponents();
Component comp;
Dimension d;
for (int i = 0 ; i < ncomponents ; i++) {
comp = target.getComponent(i);
if(comp.isVisible()) {
d = comp.preferredSize();
if(i > 0)
dim.height += gap;
dim.height += d.height;
dim.width = Math.max(d.width, dim.width);
}
}
dim.width += insets.left + insets.right;
dim.height += insets.top + insets.bottom;
return dim;
}
public Dimension minimumLayoutSize(Container target) {
Insets insets = target.insets();
Dimension dim = new Dimension(0,0);
int ncomponents = target.countComponents();
Component comp;
Dimension d;
for (int i = 0 ; i < ncomponents ; i++) {
comp = target.getComponent(i);
if(comp.isVisible()) {
d = comp.minimumSize();
dim.width = Math.max(d.width, dim.width);
dim.height += d.height;
if(i > 0) dim.height += gap;
}
}
dim.width += insets.left + insets.right;
dim.height += insets.top + insets.bottom;
return dim;
}
public void layoutContainer(Container target) {
Insets insets = target.insets();
int top = insets.top;
int left = 0;
int ncomponents = target.countComponents();
Dimension preferredSize = target.preferredSize();
Dimension targetSize = target.size();
Component comp;
Dimension ps;
if(verticalOrientation == Orientation.CENTER)
top += (targetSize.height/2) -
(preferredSize.height/2);
else if(verticalOrientation == Orientation.BOTTOM)
top = targetSize.height - preferredSize.height +
insets.top;
for (int i = 0 ; i < ncomponents ; i++) {
comp = target.getComponent(i);
left = insets.left;
if(comp.isVisible()) {
ps = comp.preferredSize();
if(horizontalOrientation == Orientation.CENTER)
left = (targetSize.width/2) - (ps.width/2);
else if(
horizontalOrientation == Orientation.RIGHT) {
left = targetSize.width - ps.width -
insets.right;
}
comp.reshape(left,top,ps.width,ps.height);
top += ps.height + gap;
}
}
}
}
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