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package com.explodingpixels.widgets;
import java.awt.Rectangle;
import javax.swing.Icon;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.plaf.basic.BasicTreeUI;
import javax.swing.tree.TreePath;
public class TreeUtils {
// TODO add Javadoc.
private TreeUtils() {
// no constructor - utility class.
}
/**
* Set's the collapsed icon to use for the given {@link JTree} if that
* tree's UI delegate exetends from {@link BasicTreeUI}. If the given tree's
* UI delegate does not extend from {@code BasicTreeUI} then the given
* tree will not be changed.
*
* @param tree the tree to set the collapsed icon for.
* @param icon the new collapsed icon to use.
* @see BasicTreeUI#setCollapsedIcon(javax.swing.Icon)
*/
public static void setCollapsedIcon(JTree tree, Icon icon) {
if (tree.getUI() instanceof BasicTreeUI) {
((BasicTreeUI) tree.getUI()).setCollapsedIcon(icon);
}
}
/**
* Set's the expanded icon to use for the given {@link JTree} if that
* tree's UI delegate extends from {@link BasicTreeUI}. If the given tree's
* UI delegate does not extend from {@code BasicTreeUI} then the given
* tree will not be changed.
*
* @param tree the tree to set the expanded icon for.
* @param icon the new collapsed icon to use.
* @see BasicTreeUI#setExpandedIcon(javax.swing.Icon)
*/
public static void setExpandedIcon(JTree tree, Icon icon) {
((BasicTreeUI) tree.getUI()).setExpandedIcon(icon);
}
/**
* Set's the left indent in pixels to use for the given {@link JTree}'s
* collapsed and expanded icon. This value in conjuction with the right
* indent comprises the total amount of space that the collapsed and
* expanded icon draw into. If the given tree's UI delegate does not extend
* from {@code BasicTreeUI} then the given tree will not be changed.
*
* @param tree the tree to set the left indent for.
* @param indent the new left indent in pixels.
* @see BasicTreeUI#setLeftChildIndent(int)
*/
public static void setLeftChildIndent(JTree tree, int indent) {
((BasicTreeUI) tree.getUI()).setLeftChildIndent(indent);
}
/**
* Set's the right indent in pixels to use for the given {@link JTree}'s
* collapsed and expanded icon. This value in conjuction with the left
* indent comprises the total amount of space that the collapsed and
* expanded icon draw into. If the given tree's UI delegate does not extend
* from {@code BasicTreeUI} then the given tree will not be changed.
*
* @param tree the tree to set the right indent for.
* @param indent the new left indent in pixels.
* @see BasicTreeUI#setRightChildIndent(int)
*/
public static void setRightChildIndent(JTree tree, int indent) {
((BasicTreeUI) tree.getUI()).setRightChildIndent(indent);
}
/**
* Repaints the selection. This allows the row selection to have a
* background color that changes based on the focus state of the
* component.
*
* @param tree the {@code JTree} to repaint the selection of.
*/
public static void repaintSelection(JTree tree) {
int[] selectedRows = tree.getSelectionRows();
// if there is a selected row, then repaint it.
if (selectedRows != null && selectedRows.length > 0) {
// grab the bounds of the first and last selected cells in column
// one (index zero).
Rectangle firstSelectedCell = tree.getRowBounds(selectedRows[0]);
Rectangle lastSelectedCell =
tree.getRowBounds(selectedRows[selectedRows.length - 1]);
// create the rectangle to repaint by unioning the first and last
// selected cells in column one and then extending that rectangle
// to extend from the left edge of the table all the way to the
// right edge.
Rectangle repaintRectangle = firstSelectedCell.union(lastSelectedCell);
repaintRectangle.x = 0;
repaintRectangle.width = tree.getWidth();
// repaint the selection area.
tree.repaint(repaintRectangle);
}
}
public static void setExpandedOnEdt(JTree tree, TreePath path, boolean expanded) {
if (expanded) {
expandPathOnEdt(tree, path);
} else {
collapsePathOnEdt(tree, path);
}
}
public static void expandPathOnEdt(final JTree tree, final TreePath path) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
if ((tree == null) || (path == null))
return;
tree.expandPath(path);
}
});
}
public static void collapsePathOnEdt(final JTree tree, final TreePath path) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
if ((tree == null) || (path == null))
return;
tree.collapsePath(path);
}
});
}
public static void installRootExpandingTreeModelListener(final JTree tree) {
TreeModelListener listener = new TreeModelListener() {
public void treeNodesChanged(TreeModelEvent e) {
}
public void treeNodesInserted(TreeModelEvent e) {
// if this is the root node, and it hasn't yet been expanded
// (because no children have been added, then expand the root now).
if (e.getTreePath().getParentPath() == null
&& tree.isCollapsed(e.getTreePath())) {
TreeUtils.expandPathOnEdt(tree, e.getTreePath());
}
}
public void treeNodesRemoved(TreeModelEvent e) {
}
public void treeStructureChanged(TreeModelEvent e) {
}
};
tree.getModel().addTreeModelListener(listener);
}
}
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