| /* BasicTreeUI.java -- |
| Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package javax.swing.plaf.basic; |
| |
| import java.awt.Color; |
| import java.awt.Component; |
| import java.awt.Dimension; |
| import java.awt.Graphics; |
| import java.awt.Rectangle; |
| |
| import javax.swing.JComponent; |
| import javax.swing.JTree; |
| import javax.swing.UIDefaults; |
| import javax.swing.UIManager; |
| import javax.swing.plaf.ComponentUI; |
| import javax.swing.plaf.TreeUI; |
| import javax.swing.tree.TreeModel; |
| import javax.swing.tree.TreePath; |
| |
| /** |
| * A delegate providing the user interface for <code>JTree</code> |
| * according to the Basic look and feel. The current implementation |
| * of GNU Classpath does really work; it is just a stub that allows |
| * compiling the code. |
| * |
| * @see javax.swing.JTree |
| * |
| * @author Sascha Brawer (brawer@dandelis.ch) |
| */ |
| public class BasicTreeUI |
| extends TreeUI |
| { |
| |
| /** |
| * Determines the geometric extent of the label that is |
| * drawn for a path. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| * |
| * @param path the path whose label extent is requested. |
| * |
| * @return a rectangle enclosing the label, or <code>null</code> |
| * if <code>path</code> contains invalid nodes. |
| */ |
| public Rectangle getPathBounds(JTree tree, TreePath path) |
| { |
| return null; // FIXME: not implemented |
| } |
| |
| |
| /** |
| * Creates a <code>TreePath</code> for the specified row. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| * |
| * @param row the index of the row, which should be a number |
| * in the range <code>[0, getRowCount(tree) - 1]</code>. |
| * |
| * @return a <code>TreePath</code> for the specified row, or |
| * <code>null</code> if <code>row</code> is outside |
| * the valid range. |
| */ |
| public TreePath getPathForRow(JTree tree, int row) |
| { |
| return null; // FIXME: not implemented |
| } |
| |
| |
| /** |
| * Determines in which row a <code>TreePath</code> is currently |
| * being displayed. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| * |
| * @param path the path for which the caller wants to know |
| * in which row it is being displayed. |
| * |
| * @return a number in the range <code>[0, getRowCount(tree) |
| * - 1]</code> if the path is currently on display; |
| * <code>-1</code> if the path is not shown to the |
| * user. |
| */ |
| public int getRowForPath(JTree tree, TreePath path) |
| { |
| return -1; // FIXME: not implemented |
| } |
| |
| |
| /** |
| * Counts how many rows are currently displayed. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| * |
| * @return the number of visible rows. |
| */ |
| public int getRowCount(JTree tree) |
| { |
| return 0; // FIXME: not implemented |
| } |
| |
| |
| /** |
| * Finds the path that is closest to the specified position. |
| * |
| * <p><img src="../doc-files/TreeUI-1.png" width="300" height="250" |
| * alt="[A screen shot of a JTree]" /> |
| * |
| * <p>As shown by the above illustration, the bounds of the |
| * closest path do not necessarily need to contain the passed |
| * location. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| * |
| * @param x the horizontal location, relative to the origin |
| * of <code>tree</code>. |
| * |
| * @param y the vertical location, relative to the origin |
| * of <code>tree</code>. |
| * |
| * @return the closest path, or <code>null</code> if the |
| * tree is currenlty not displaying any paths at all. |
| */ |
| public TreePath getClosestPathForLocation(JTree tree, |
| int x, int y) |
| { |
| return null; // FIXME: not implemented |
| } |
| |
| |
| /** |
| * Determines whether the user is currently editing a tree cell. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| * |
| * @see #getEditingPath |
| */ |
| public boolean isEditing(JTree tree) |
| { |
| return false; // FIXME: not implemented |
| } |
| |
| |
| /** |
| * Stops editing a tree cell, committing the entered value into the |
| * tree’s model. If no editing session is active, or if the |
| * active editor does not agree to stopping, nothing happens. In |
| * some look and feels, this action happens when the user has |
| * pressed the enter key. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| * |
| * @return <code>false</code> if the editing still goes on because |
| * the cell editor has objected to stopping the session; |
| * <code>true</code> if editing has been stopped. |
| */ |
| public boolean stopEditing(JTree tree) |
| { |
| return true; // FIXME: not implemented |
| } |
| |
| /** |
| * Cancels editing a tree cell, discarding any entered value. |
| * If no editing session is active, nothing happens. The cell |
| * editor is not given an opportunity to veto the canceling. |
| * In some look and feels, this action happens when the user has |
| * pressed the escape key. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| */ |
| public void cancelEditing(JTree tree) |
| { |
| // FIXME: not implemented |
| } |
| |
| |
| /** |
| * Starts a session to edit a tree cell. If the cell editor |
| * rejects editing the cell, it will just be selected. |
| * |
| * @param tree the <code>JTree</code> for which this delegate |
| * object provides the user interface. |
| * |
| * @param path the cell to edit. |
| */ |
| public void startEditingAtPath(JTree tree, TreePath path) |
| { |
| // FIXME: not implemented |
| } |
| |
| |
| /** |
| * Retrieves the tree cell that is currently being edited. |
| * |
| * @return the currently edited path, or <code>null</code> |
| * if no editing session is currently active. |
| */ |
| public TreePath getEditingPath(JTree tree) |
| { |
| return null; // FIXME: not implemented |
| } |
| |
| public static ComponentUI createUI(JComponent c) |
| { |
| return new BasicTreeUI(); |
| } |
| |
| int rightChildIndent; |
| int leftChildIndent; |
| int rowHeight; |
| Color hashColor; |
| |
| protected void installDefaults(JTree tree) |
| { |
| UIDefaults defaults = UIManager.getLookAndFeelDefaults(); |
| |
| tree.setFont(defaults.getFont("Tree.font")); |
| tree.setForeground(defaults.getColor("Tree.foreground")); |
| tree.setBackground(defaults.getColor("Tree.background")); |
| tree.setOpaque(true); |
| |
| hashColor = defaults.getColor("Tree.hash"); |
| rightChildIndent = defaults.getInt("Tree.rightChildIndent"); |
| leftChildIndent = defaults.getInt("Tree.leftChildIndent"); |
| rowHeight = defaults.getInt("Tree.rowHeight"); |
| } |
| |
| protected void installKeyboardActions() |
| { |
| } |
| |
| protected void installListeners() |
| { |
| } |
| |
| public void installUI(JComponent c) |
| { |
| installDefaults((JTree) c); |
| } |
| |
| |
| protected void uninstallDefaults(JTree tree) |
| { |
| tree.setFont(null); |
| tree.setForeground(null); |
| tree.setBackground(null); |
| |
| tree.setCellRenderer(null); |
| } |
| |
| public void uninstallUI(JComponent c) |
| { |
| uninstallDefaults((JTree) c); |
| } |
| |
| public Dimension getPreferredSize(JComponent c) |
| { |
| return new Dimension(200,200); |
| } |
| |
| protected void paintLeaf(Graphics g, int x, int y, JTree tree, Object leaf) |
| { |
| Component c = tree.getCellRenderer().getTreeCellRendererComponent(tree, |
| leaf, |
| false, // selected |
| false, // expanded |
| true, // leaf |
| 0, // row |
| false // hasFocus |
| ); |
| g.translate(x, y); |
| c.paint(g); |
| g.translate(-x, -y); |
| } |
| |
| protected void paintNonLeaf(Graphics g, int x, int y, JTree tree, Object nonLeaf) |
| { |
| Component c = tree.getCellRenderer().getTreeCellRendererComponent(tree, |
| nonLeaf, |
| false, // selected |
| false, // expanded |
| false, // leaf |
| 0, // row |
| false // hasFocus |
| ); |
| g.translate(x, y); |
| c.paint(g); |
| g.translate(-x, -y); |
| } |
| |
| protected int paintRecursive(Graphics g, |
| int indentation, |
| int descent, |
| int childNumber, |
| int depth, |
| JTree tree, |
| TreeModel mod, |
| Object curr) |
| { |
| Rectangle clip = g.getClipBounds(); |
| if (indentation > clip.x + clip.width + rightChildIndent || |
| descent > clip.y + clip.height + rowHeight) |
| return descent; |
| |
| |
| int halfHeight = rowHeight / 2; |
| int halfWidth = rightChildIndent / 2; |
| int y0 = descent + halfHeight; |
| |
| if (mod.isLeaf(curr)) |
| { |
| paintLeaf(g, indentation, descent, tree, curr); |
| descent += rowHeight; |
| } |
| else |
| { |
| if (depth > 0 || tree.isRootVisible()) |
| { |
| paintNonLeaf(g, indentation, descent, tree, curr); |
| descent += rowHeight; |
| y0 += halfHeight; |
| } |
| int max = mod.getChildCount(curr); |
| for (int i = 0; i < max; ++i) |
| { |
| g.setColor(hashColor); |
| g.drawLine(indentation + halfWidth, descent + halfHeight, |
| indentation + rightChildIndent, descent + halfHeight); |
| descent = paintRecursive(g, |
| indentation + rightChildIndent, descent, |
| i, depth+1, |
| tree, mod, mod.getChild(curr, i)); |
| } |
| } |
| |
| int y1 = descent - halfHeight; |
| if (y0 != y1) |
| { |
| g.setColor(hashColor); |
| g.drawLine(indentation + halfWidth, y0, |
| indentation + halfWidth, y1); |
| } |
| |
| return descent; |
| } |
| |
| public void paint(Graphics g, JComponent c) |
| { |
| JTree tree = (JTree) c; |
| TreeModel mod = tree.getModel(); |
| g.translate(10, 10); |
| paintRecursive(g, 0, 0, 0, 0, tree, mod, mod.getRoot()); |
| g.translate(-10, -10); |
| } |
| } |
