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