1 | /**************************************************************************** |
2 | ** |
3 | ** Copyright (C) 2016 The Qt Company Ltd. |
4 | ** Contact: https://www.qt.io/licensing/ |
5 | ** |
6 | ** This file is part of the examples of the Qt Toolkit. |
7 | ** |
8 | ** $QT_BEGIN_LICENSE:BSD$ |
9 | ** Commercial License Usage |
10 | ** Licensees holding valid commercial Qt licenses may use this file in |
11 | ** accordance with the commercial license agreement provided with the |
12 | ** Software or, alternatively, in accordance with the terms contained in |
13 | ** a written agreement between you and The Qt Company. For licensing terms |
14 | ** and conditions see https://www.qt.io/terms-conditions. For further |
15 | ** information use the contact form at https://www.qt.io/contact-us. |
16 | ** |
17 | ** BSD License Usage |
18 | ** Alternatively, you may use this file under the terms of the BSD license |
19 | ** as follows: |
20 | ** |
21 | ** "Redistribution and use in source and binary forms, with or without |
22 | ** modification, are permitted provided that the following conditions are |
23 | ** met: |
24 | ** * Redistributions of source code must retain the above copyright |
25 | ** notice, this list of conditions and the following disclaimer. |
26 | ** * Redistributions in binary form must reproduce the above copyright |
27 | ** notice, this list of conditions and the following disclaimer in |
28 | ** the documentation and/or other materials provided with the |
29 | ** distribution. |
30 | ** * Neither the name of The Qt Company Ltd nor the names of its |
31 | ** contributors may be used to endorse or promote products derived |
32 | ** from this software without specific prior written permission. |
33 | ** |
34 | ** |
35 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
36 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
37 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
38 | ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
39 | ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
40 | ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
41 | ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
42 | ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
43 | ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
44 | ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
45 | ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
46 | ** |
47 | ** $QT_END_LICENSE$ |
48 | ** |
49 | ****************************************************************************/ |
50 | |
51 | #include "codeeditor.h" |
52 | |
53 | #include <QPainter> |
54 | #include <QTextBlock> |
55 | |
56 | //![constructor] |
57 | |
58 | CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent) |
59 | { |
60 | lineNumberArea = new LineNumberArea(this); |
61 | |
62 | connect(sender: this, signal: &CodeEditor::blockCountChanged, receiver: this, slot: &CodeEditor::updateLineNumberAreaWidth); |
63 | connect(sender: this, signal: &CodeEditor::updateRequest, receiver: this, slot: &CodeEditor::updateLineNumberArea); |
64 | connect(sender: this, signal: &CodeEditor::cursorPositionChanged, receiver: this, slot: &CodeEditor::highlightCurrentLine); |
65 | |
66 | updateLineNumberAreaWidth(newBlockCount: 0); |
67 | highlightCurrentLine(); |
68 | } |
69 | |
70 | //![constructor] |
71 | |
72 | //![extraAreaWidth] |
73 | |
74 | int CodeEditor::lineNumberAreaWidth() |
75 | { |
76 | int digits = 1; |
77 | int max = qMax(a: 1, b: blockCount()); |
78 | while (max >= 10) { |
79 | max /= 10; |
80 | ++digits; |
81 | } |
82 | |
83 | int space = 3 + fontMetrics().horizontalAdvance(QLatin1Char('9')) * digits; |
84 | |
85 | return space; |
86 | } |
87 | |
88 | //![extraAreaWidth] |
89 | |
90 | //![slotUpdateExtraAreaWidth] |
91 | |
92 | void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */) |
93 | { |
94 | setViewportMargins(left: lineNumberAreaWidth(), top: 0, right: 0, bottom: 0); |
95 | } |
96 | |
97 | //![slotUpdateExtraAreaWidth] |
98 | |
99 | //![slotUpdateRequest] |
100 | |
101 | void CodeEditor::updateLineNumberArea(const QRect &rect, int dy) |
102 | { |
103 | if (dy) |
104 | lineNumberArea->scroll(dx: 0, dy); |
105 | else |
106 | lineNumberArea->update(ax: 0, ay: rect.y(), aw: lineNumberArea->width(), ah: rect.height()); |
107 | |
108 | if (rect.contains(r: viewport()->rect())) |
109 | updateLineNumberAreaWidth(0); |
110 | } |
111 | |
112 | //![slotUpdateRequest] |
113 | |
114 | //![resizeEvent] |
115 | |
116 | void CodeEditor::resizeEvent(QResizeEvent *e) |
117 | { |
118 | QPlainTextEdit::resizeEvent(e); |
119 | |
120 | QRect cr = contentsRect(); |
121 | lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height())); |
122 | } |
123 | |
124 | //![resizeEvent] |
125 | |
126 | //![cursorPositionChanged] |
127 | |
128 | void CodeEditor::highlightCurrentLine() |
129 | { |
130 | QList<QTextEdit::ExtraSelection> ; |
131 | |
132 | if (!isReadOnly()) { |
133 | QTextEdit::ExtraSelection selection; |
134 | |
135 | QColor lineColor = QColor(Qt::yellow).lighter(f: 160); |
136 | |
137 | selection.format.setBackground(lineColor); |
138 | selection.format.setProperty(propertyId: QTextFormat::FullWidthSelection, value: true); |
139 | selection.cursor = textCursor(); |
140 | selection.cursor.clearSelection(); |
141 | extraSelections.append(t: selection); |
142 | } |
143 | |
144 | setExtraSelections(extraSelections); |
145 | } |
146 | |
147 | //![cursorPositionChanged] |
148 | |
149 | //![extraAreaPaintEvent_0] |
150 | |
151 | void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event) |
152 | { |
153 | QPainter painter(lineNumberArea); |
154 | painter.fillRect(r: event->rect(), c: Qt::lightGray); |
155 | |
156 | //![extraAreaPaintEvent_0] |
157 | |
158 | //![extraAreaPaintEvent_1] |
159 | QTextBlock block = firstVisibleBlock(); |
160 | int blockNumber = block.blockNumber(); |
161 | int top = qRound(d: blockBoundingGeometry(block).translated(p: contentOffset()).top()); |
162 | int bottom = top + qRound(d: blockBoundingRect(block).height()); |
163 | //![extraAreaPaintEvent_1] |
164 | |
165 | //![extraAreaPaintEvent_2] |
166 | while (block.isValid() && top <= event->rect().bottom()) { |
167 | if (block.isVisible() && bottom >= event->rect().top()) { |
168 | QString number = QString::number(blockNumber + 1); |
169 | painter.setPen(Qt::black); |
170 | painter.drawText(x: 0, y: top, w: lineNumberArea->width(), h: fontMetrics().height(), |
171 | flags: Qt::AlignRight, str: number); |
172 | } |
173 | |
174 | block = block.next(); |
175 | top = bottom; |
176 | bottom = top + qRound(d: blockBoundingRect(block).height()); |
177 | ++blockNumber; |
178 | } |
179 | } |
180 | //![extraAreaPaintEvent_2] |
181 | |
182 | |