@Override
public void doLayout(TerminalSize area, List<Component> components) {
// Sanity check, if the area is way too small, just return
Component[][] table = buildTable(components);
table = eliminateUnusedRowsAndColumns(table);
if (area.equals(TerminalSize.ZERO)
|| table.length == 0
|| area.getColumns()
<= leftMarginSize + rightMarginSize + ((table[0].length - 1) * horizontalSpacing)
|| area.getRows()
<= bottomMarginSize + topMarginSize + ((table.length - 1) * verticalSpacing)) {
return;
}
// Adjust area to the margins
area = area.withRelative(-leftMarginSize - rightMarginSize, -topMarginSize - bottomMarginSize);
Map<Component, TerminalSize> sizeMap = new IdentityHashMap<Component, TerminalSize>();
Map<Component, TerminalPosition> positionMap =
new IdentityHashMap<Component, TerminalPosition>();
// Figure out each column first, this can be done independently of the row heights
int[] columnWidths = getPreferredColumnWidths(table);
// Take notes of which columns we can expand if the usable area is larger than what the
// components want
Set<Integer> expandableColumns = getExpandableColumns(table);
// Next, start shrinking to make sure it fits the size of the area we are trying to lay out on.
// Notice we subtract the horizontalSpacing to take the space between components into account
TerminalSize areaWithoutHorizontalSpacing =
area.withRelativeColumns(-horizontalSpacing * (table[0].length - 1));
int totalWidth = shrinkWidthToFitArea(areaWithoutHorizontalSpacing, columnWidths);
// Finally, if there is extra space, make the expandable columns larger
while (areaWithoutHorizontalSpacing.getColumns() > totalWidth && !expandableColumns.isEmpty()) {
totalWidth =
grabExtraHorizontalSpace(
areaWithoutHorizontalSpacing, columnWidths, expandableColumns, totalWidth);
}
// Now repeat for rows
int[] rowHeights = getPreferredRowHeights(table);
Set<Integer> expandableRows = getExpandableRows(table);
TerminalSize areaWithoutVerticalSpacing =
area.withRelativeRows(-verticalSpacing * (table.length - 1));
int totalHeight = shrinkHeightToFitArea(areaWithoutVerticalSpacing, rowHeights);
while (areaWithoutVerticalSpacing.getRows() > totalHeight && !expandableRows.isEmpty()) {
totalHeight =
grabExtraVerticalSpace(
areaWithoutVerticalSpacing, rowHeights, expandableRows, totalHeight);
}
// Ok, all constraints are in place, we can start placing out components. To simplify, do it
// horizontally first
// and vertically after
TerminalPosition tableCellTopLeft = TerminalPosition.TOP_LEFT_CORNER;
for (int y = 0; y < table.length; y++) {
tableCellTopLeft = tableCellTopLeft.withColumn(0);
for (int x = 0; x < table[y].length; x++) {
Component component = table[y][x];
if (component != null && !positionMap.containsKey(component)) {
GridLayoutData layoutData = getLayoutData(component);
TerminalSize size = component.getPreferredSize();
TerminalPosition position = tableCellTopLeft;
int availableHorizontalSpace = 0;
int availableVerticalSpace = 0;
for (int i = 0; i < layoutData.horizontalSpan; i++) {
availableHorizontalSpace += columnWidths[x + i] + (i > 0 ? horizontalSpacing : 0);
}
for (int i = 0; i < layoutData.verticalSpan; i++) {
availableVerticalSpace += rowHeights[y + i] + (i > 0 ? verticalSpacing : 0);
}
// Make sure to obey the size restrictions
size = size.withColumns(Math.min(size.getColumns(), availableHorizontalSpace));
size = size.withRows(Math.min(size.getRows(), availableVerticalSpace));
switch (layoutData.horizontalAlignment) {
case CENTER:
position =
position.withRelativeColumn((availableHorizontalSpace - size.getColumns()) / 2);
break;
case END:
position = position.withRelativeColumn(availableHorizontalSpace - size.getColumns());
break;
case FILL:
size = size.withColumns(availableHorizontalSpace);
break;
default:
break;
}
switch (layoutData.verticalAlignment) {
case CENTER:
position = position.withRelativeRow((availableVerticalSpace - size.getRows()) / 2);
break;
case END:
position = position.withRelativeRow(availableVerticalSpace - size.getRows());
break;
case FILL:
size = size.withRows(availableVerticalSpace);
break;
default:
break;
}
sizeMap.put(component, size);
positionMap.put(component, position);
}
tableCellTopLeft = tableCellTopLeft.withRelativeColumn(columnWidths[x] + horizontalSpacing);
}
tableCellTopLeft = tableCellTopLeft.withRelativeRow(rowHeights[y] + verticalSpacing);
}
// Apply the margins here
for (Component component : components) {
component.setPosition(positionMap.get(component).withRelative(leftMarginSize, topMarginSize));
component.setSize(sizeMap.get(component));
}
this.changed = false;
}
@Override
public void doLayout(TerminalSize area, List<Component> components) {
EnumMap<Location, Component> layout = makeLookupMap(components);
int availableHorizontalSpace = area.getColumns();
int availableVerticalSpace = area.getRows();
// We'll need this later on
int topComponentHeight = 0;
int leftComponentWidth = 0;
// First allocate the top
if (layout.containsKey(Location.TOP)) {
Component topComponent = layout.get(Location.TOP);
topComponentHeight =
Math.min(topComponent.getPreferredSize().getRows(), availableVerticalSpace);
topComponent.setPosition(TerminalPosition.TOP_LEFT_CORNER);
topComponent.setSize(new TerminalSize(availableHorizontalSpace, topComponentHeight));
availableVerticalSpace -= topComponentHeight;
}
// Next allocate the bottom
if (layout.containsKey(Location.BOTTOM)) {
Component bottomComponent = layout.get(Location.BOTTOM);
int bottomComponentHeight =
Math.min(bottomComponent.getPreferredSize().getRows(), availableVerticalSpace);
bottomComponent.setPosition(new TerminalPosition(0, area.getRows() - bottomComponentHeight));
bottomComponent.setSize(new TerminalSize(availableHorizontalSpace, bottomComponentHeight));
availableVerticalSpace -= bottomComponentHeight;
}
// Now divide the remaining space between LEFT, CENTER and RIGHT
if (layout.containsKey(Location.LEFT)) {
Component leftComponent = layout.get(Location.LEFT);
leftComponentWidth =
Math.min(leftComponent.getPreferredSize().getColumns(), availableHorizontalSpace);
leftComponent.setPosition(new TerminalPosition(0, topComponentHeight));
leftComponent.setSize(new TerminalSize(leftComponentWidth, availableVerticalSpace));
availableHorizontalSpace -= leftComponentWidth;
}
if (layout.containsKey(Location.RIGHT)) {
Component rightComponent = layout.get(Location.RIGHT);
int rightComponentWidth =
Math.min(rightComponent.getPreferredSize().getColumns(), availableHorizontalSpace);
rightComponent.setPosition(
new TerminalPosition(area.getColumns() - rightComponentWidth, topComponentHeight));
rightComponent.setSize(new TerminalSize(rightComponentWidth, availableVerticalSpace));
availableHorizontalSpace -= rightComponentWidth;
}
if (layout.containsKey(Location.CENTER)) {
Component centerComponent = layout.get(Location.CENTER);
centerComponent.setPosition(new TerminalPosition(leftComponentWidth, topComponentHeight));
centerComponent.setSize(new TerminalSize(availableHorizontalSpace, availableVerticalSpace));
}
// Set the remaining components to 0x0
for (Component component : components) {
if (!layout.values().contains(component)) {
component.setPosition(TerminalPosition.TOP_LEFT_CORNER);
component.setSize(TerminalSize.ZERO);
}
}
}
