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package gjt;
import java.awt.*;
/**
* Layout manager for a Scroller.<p>
*
* Lays out 3 Components: a horizontal scrollbar, a vertical
* scrollbar and a viewport (Panel).<p>
*
* Valid names/Component pairs that can be added via
* addLayoutComponent(String, Component):<p>
* <dl>
* <dd> "East" Scrollbar (vertical)
* <dd> "West" Scrollbar (vertical)
* <dd> "North" Scrollbar (horizontal)
* <dd> "South" Scrollbar (horizontal)
* <dd> "Scroll" Panel (viewport)
* </dl>
*
* @version 1.0, Apr 1 1996
* @author David Geary
* @see Scroller
*/
public class ScrollerLayout implements LayoutManager {
private Scroller scroller;
private Scrollbar hbar, vbar;
private String hbarPosition, vbarPosition;
private Component viewport;
private int top, bottom, right, left;
public ScrollerLayout(Scroller scroller) {
this.scroller = scroller;
}
public void addLayoutComponent(String name,
Component comp) {
Assert.notFalse(comp != null);
if(comp instanceof Scrollbar) {
Scrollbar sbar = (Scrollbar)comp;
if(sbar.getOrientation() == Scrollbar.VERTICAL) {
Assert.notFalse("East".equals(name) == true ||
"West".equals(name) == true);
vbar = sbar;
vbarPosition = name;
}
else {
Assert.notFalse("North".equals(name) == true ||
"South".equals(name) == true);
hbar = sbar;
hbarPosition = name;
}
}
else {
Assert.notFalse("Scroll".equals(name) == true);
viewport = comp;
}
}
public void removeLayoutComponent(Component comp) {
if(comp == vbar) vbar = null;
if(comp == hbar) hbar = null;
if(comp == viewport) viewport = null;
}
public Dimension preferredLayoutSize(Container parent) {
Dimension dim = new Dimension(0,0);
if(vbar != null && vbar.isVisible()) {
Dimension d = vbar.preferredSize();
dim.width += d.width;
dim.height = d.height;
}
if(hbar != null && hbar.isVisible()) {
Dimension d = hbar.preferredSize();
dim.width += d.width;
dim.height = Math.max(d.height, dim.height);
}
if(viewport != null && viewport.isVisible()) {
Dimension d = viewport.preferredSize();
dim.width += d.width;
dim.height = Math.max(d.height, dim.height);
}
return dim;
}
public Dimension minimumLayoutSize(Container parent) {
Dimension dim = new Dimension(0,0);
if(vbar != null && vbar.isVisible()) {
Dimension d = vbar.minimumSize();
dim.width += d.width;
dim.height = d.height;
}
if(hbar != null && hbar.isVisible()) {
Dimension d = hbar.minimumSize();
dim.width += d.width;
dim.height = Math.max(d.height, dim.height);
}
if(viewport != null && viewport.isVisible()) {
Dimension d = viewport.minimumSize();
dim.width += d.width;
dim.height = Math.max(d.height, dim.height);
}
return dim;
}
public void layoutContainer(Container target) {
Insets insets = target.insets();
Dimension targetSize = target.size();
top = insets.top;
bottom = targetSize.height - insets.bottom;
left = insets.left;
right = targetSize.width - insets.right;
scroller.manageScrollbars();
reshapeHorizontalScrollbar();
reshapeVerticalScrollbar ();
reshapeViewport ();
scroller.setScrollbarValues();
}
private void reshapeHorizontalScrollbar() {
if(hbar != null && hbar.isVisible()) {
if("North".equals(hbarPosition)) {
Dimension d = hbar.preferredSize();
hbar.reshape(left, top, right - left, d.height);
top += d.height;
}
else { // South
Dimension d = hbar.preferredSize();
hbar.reshape(left, bottom - d.height,
right - left,d.height);
bottom -= d.height;
}
}
}
private void reshapeVerticalScrollbar() {
if(hbar != null && vbar.isVisible()) {
if("East".equals(vbarPosition)) {
Dimension d = vbar.preferredSize();
vbar.reshape(right - d.width, top,
d.width, bottom - top);
right -= d.width;
}
else { // West
Dimension d = vbar.preferredSize();
vbar.reshape(left, top,
d.width, bottom - top);
left += d.width;
}
}
}
private void reshapeViewport() {
if(viewport != null && viewport.isVisible()) {
viewport.reshape(left, top,
right - left, bottom - top);
}
}
}
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