/** Calculate the minimum and preferred size for every row and column. */
private void calculateSizes() {
Dimension dim[] = new Dimension[child.size()];
for (int i = 0; i < dim.length; i++) dim[i] = child.get(i).widget.getMinimumSize();
minRowSize = calculateRequiredSizes(dim, true);
minColSize = calculateRequiredSizes(dim, false);
for (int i = 0; i < dim.length; i++) {
ChildInfo info = child.get(i);
LayoutInfo layout = (info.layout == null ? defaultLayout : info.layout);
dim[i] = layout.getPreferredSize(info.widget);
}
prefRowSize = calculateRequiredSizes(dim, true);
prefColSize = calculateRequiredSizes(dim, false);
}
/**
* Layout the child Widgets. This may be invoked whenever something has changed (the size of this
* WidgetContainer, the preferred size of one of its children, etc.) that causes the layout to no
* longer be correct. If a child is itself a WidgetContainer, its layoutChildren() method will be
* called in turn.
*/
public void layoutChildren() {
if (minColSize == null) calculateSizes();
Dimension size = getComponent().getSize();
int rowPos[] = calculatePositions(minRowSize, prefRowSize, rowWeight, size.height);
int colPos[] = calculatePositions(minColSize, prefColSize, colWeight, size.width);
Rectangle cell = new Rectangle();
for (int i = 0; i < child.size(); i++) {
ChildInfo info = child.get(i);
LayoutInfo layout = (info.layout == null ? defaultLayout : info.layout);
cell.x = (info.x == 0 ? 0 : colPos[info.x - 1]);
cell.y = (info.y == 0 ? 0 : rowPos[info.y - 1]);
cell.width = colPos[info.x + info.width - 1] - cell.x;
cell.height = rowPos[info.y + info.height - 1] - cell.y;
info.widget.getComponent().setBounds(layout.getWidgetLayout(info.widget, cell));
if (info.widget instanceof WidgetContainer) ((WidgetContainer) info.widget).layoutChildren();
}
}