1/*
2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.apple.laf;
27
28import sun.swing.SwingUtilities2;
29
30import javax.swing.*;
31import java.awt.*;
32
33@SuppressWarnings("serial") // Superclass is not serializable across versions
34class AquaComboBoxRendererInternal<E> extends JLabel implements ListCellRenderer<E> {
35    final JComboBox<?> fComboBox;
36    boolean fSelected;
37    boolean fChecked;
38    boolean fInList;
39    boolean fEditable;
40    boolean fDrawCheckedItem = true;
41
42    // Provides space for a checkbox, and is translucent
43    public AquaComboBoxRendererInternal(final JComboBox<?> comboBox) {
44        super();
45        fComboBox = comboBox;
46    }
47
48    // Don't include checkIcon space, because this is also used for button size calculations
49    // - the popup-size calc will get checkIcon space from getInsets
50    public Dimension getPreferredSize() {
51        // From BasicComboBoxRenderer - trick to avoid zero-height items
52        final Dimension size;
53
54        final String text = getText();
55        if ((text == null) || ("".equals(text))) {
56            setText(" ");
57            size = super.getPreferredSize();
58            setText("");
59        } else {
60            size = super.getPreferredSize();
61        }
62        return size;
63    }
64
65    // Don't paint the border here, it gets painted by the UI
66    protected void paintBorder(final Graphics g) {
67
68    }
69
70    public int getBaseline(int width, int height) {
71        return super.getBaseline(width, height) - 1;
72    }
73
74    // Really means is the one with the mouse over it
75    public Component getListCellRendererComponent(final JList<? extends E> list,
76                                                  final E value, int index,
77                                                  final boolean isSelected,
78                                                  final boolean cellHasFocus) {
79        fInList = (index >= 0); // When the button wants the item painted, it passes in -1
80        fSelected = isSelected;
81        if (index < 0) {
82            index = fComboBox.getSelectedIndex();
83        }
84
85        // changed this to not ask for selected index but directly compare the current item and selected item
86        // different from basic because basic has no concept of checked, just has the last one selected,
87        // and the user changes selection. We have selection and a check mark.
88        // we used to call fComboBox.getSelectedIndex which ends up being a very bad call for large checkboxes
89        // it does a linear compare of every object in the checkbox until it finds the selected one, so if
90        // we have a 5000 element list we will 5000 * (selected index) .equals() of objects.
91        // See Radar #3141307
92
93        // Fix for Radar # 3204287 where we ask for an item at a negative index!
94        if (index >= 0) {
95            final Object item = fComboBox.getItemAt(index);
96            fChecked = fInList && item != null && item.equals(fComboBox.getSelectedItem());
97        } else {
98            fChecked = false;
99        }
100
101        fEditable = fComboBox.isEditable();
102        if (isSelected) {
103            if (fEditable) {
104                setBackground(UIManager.getColor("List.selectionBackground"));
105                setForeground(UIManager.getColor("List.selectionForeground"));
106            } else {
107                setBackground(list.getSelectionBackground());
108                setForeground(list.getSelectionForeground());
109            }
110        } else {
111            if (fEditable) {
112                setBackground(UIManager.getColor("List.background"));
113                setForeground(UIManager.getColor("List.foreground"));
114            } else {
115                setBackground(list.getBackground());
116                setForeground(list.getForeground());
117            }
118        }
119
120        setFont(list.getFont());
121
122        if (value instanceof Icon) {
123            setIcon((Icon)value);
124        } else {
125            setText((value == null) ? " " : value.toString());
126        }
127        return this;
128    }
129
130    public Insets getInsets(Insets insets) {
131        if (insets == null) insets = new Insets(0, 0, 0, 0);
132        insets.top = 1;
133        insets.bottom = 1;
134        insets.right = 5;
135        insets.left = (fInList && !fEditable ? 16 + 7 : 5);
136        return insets;
137    }
138
139    protected void setDrawCheckedItem(final boolean drawCheckedItem) {
140        this.fDrawCheckedItem = drawCheckedItem;
141    }
142
143    // Paint this component, and a checkbox if it's the selected item and not in the button
144    protected void paintComponent(final Graphics g) {
145        if (fInList) {
146            if (fSelected && !fEditable) {
147                AquaMenuPainter.instance().paintSelectedMenuItemBackground(g, getWidth(), getHeight());
148            } else {
149                g.setColor(getBackground());
150                g.fillRect(0, 0, getWidth(), getHeight());
151            }
152
153            if (fChecked && !fEditable && fDrawCheckedItem) {
154                final int y = getHeight() - 4;
155                g.setColor(getForeground());
156                SwingUtilities2.drawString(fComboBox, g, "\u2713", 6, y);
157            }
158        }
159        super.paintComponent(g);
160    }
161}
162