| Clover coverage report - PLT Utilities Test Coverage (plt-20120304-r5436) |
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| ShadedTreeCellRenderer.java | 0% | 0% | 0% | 0% |
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| 1 | /*BEGIN_COPYRIGHT_BLOCK* | |
| 2 | ||
| 3 | PLT Utilities BSD License | |
| 4 | ||
| 5 | Copyright (c) 2007-2010 JavaPLT group at Rice University | |
| 6 | All rights reserved. | |
| 7 | ||
| 8 | Developed by: Java Programming Languages Team | |
| 9 | Rice University | |
| 10 | http://www.cs.rice.edu/~javaplt/ | |
| 11 | ||
| 12 | Redistribution and use in source and binary forms, with or without modification, are permitted | |
| 13 | provided that the following conditions are met: | |
| 14 | ||
| 15 | - Redistributions of source code must retain the above copyright notice, this list of conditions | |
| 16 | and the following disclaimer. | |
| 17 | - Redistributions in binary form must reproduce the above copyright notice, this list of | |
| 18 | conditions and the following disclaimer in the documentation and/or other materials provided | |
| 19 | with the distribution. | |
| 20 | - Neither the name of the JavaPLT group, Rice University, nor the names of the library's | |
| 21 | contributors may be used to endorse or promote products derived from this software without | |
| 22 | specific prior written permission. | |
| 23 | ||
| 24 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR | |
| 25 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 26 | FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND | |
| 27 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 28 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 29 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER | |
| 30 | IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | |
| 31 | OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 32 | ||
| 33 | *END_COPYRIGHT_BLOCK*/ | |
| 34 | ||
| 35 | package edu.rice.cs.plt.swing; | |
| 36 | ||
| 37 | import java.awt.*; | |
| 38 | import javax.swing.*; | |
| 39 | import javax.swing.tree.*; | |
| 40 | ||
| 41 | /** | |
| 42 | * A tree cell renderer that sets the backgrounds of cells to alternating colors. | |
| 43 | */ | |
| 44 | public class ShadedTreeCellRenderer implements TreeCellRenderer { | |
| 45 | ||
| 46 | /** An invisible component to return when the provided row number is incorrect. */ | |
| 47 | private static final Component DUMMY_CELL = Box.createRigidArea(new Dimension(0, 0)); | |
| 48 | ||
| 49 | private final TreeCellRenderer _renderer; | |
| 50 | private final Color _even; | |
| 51 | private final Color _odd; | |
| 52 | ||
| 53 | /** | |
| 54 | * @param renderer A renderer to provide the contents of each cell. For the shading | |
| 55 | * to be visible, the returned components must honor their backgroud | |
| 56 | * color setting, and must not be obscured by opaque child components. | |
| 57 | * @param even Color to shade the first (at index 0) row and each subsequent even row. | |
| 58 | * @param odd Color to shade the second (at index 1) row and each subsequent odd row. | |
| 59 | */ | |
| 60 | 0 | public ShadedTreeCellRenderer(TreeCellRenderer renderer, Color even, Color odd) { |
| 61 | 0 | _renderer = renderer; |
| 62 | 0 | _even = even; |
| 63 | 0 | _odd = odd; |
| 64 | } | |
| 65 | ||
| 66 | 0 | public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, |
| 67 | boolean expanded, boolean leaf, int row, | |
| 68 | boolean hasFocus) { | |
| 69 | /** Observed bug: provided row numbers will occasionally be out of the range of valid rows. | |
| 70 | * Sometimes this seems to be a pre-drawing step to get sizing right, and the value | |
| 71 | * is -1. Other times, the value is too large, and the cell is drawn on top of the | |
| 72 | * correct cell. The result is that the shading will sometimes be incorrect, depending | |
| 73 | * on the too-large value of row. As a workaround, we just ignore requests to handle | |
| 74 | * cells with too-large row values (by returning an invisible, sizeless component). | |
| 75 | */ | |
| 76 | 0 | int maxRow = tree.getRowCount() - (tree.isRootVisible() ? 0 : 1); |
| 77 | 0 | if (row < maxRow) { |
| 78 | 0 | Component c = _renderer.getTreeCellRendererComponent(tree, value, selected, expanded, |
| 79 | leaf, row, hasFocus); | |
| 80 | 0 | c.setBackground(row % 2 == 0 ? _even : _odd); |
| 81 | 0 | return c; |
| 82 | } | |
| 83 | 0 | else { return DUMMY_CELL; } |
| 84 | } | |
| 85 | ||
| 86 | /** | |
| 87 | * Wrap the given tree's cell renderer in a {@code ShadedTreeCellRenderer} using the given | |
| 88 | * colors. | |
| 89 | */ | |
| 90 | 0 | public static void shadeTree(JTree tree, Color even, Color odd) { |
| 91 | 0 | tree.setCellRenderer(new ShadedTreeCellRenderer(tree.getCellRenderer(), even, odd)); |
| 92 | } | |
| 93 | ||
| 94 | ||
| 95 | } |
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