1/*
2 * Copyright (C) 2020-2022 Roy Qu (royqh1979@gmail.com)
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17#ifndef LINENUMBERTEXTEDITOR_H
18#define LINENUMBERTEXTEDITOR_H
19
20#include <QPlainTextEdit>
21
22class LineNumberTextEditor : public QPlainTextEdit
23{
24 Q_OBJECT
25public:
26 LineNumberTextEditor(QWidget *parent = nullptr);
27
28 void lineNumberAreaPaintEvent(QPaintEvent *event);
29 int lineNumberAreaWidth();
30
31 const QColor &lineNumberAreaForeground() const;
32 void setLineNumberAreaForeground(const QColor &newLineNumberAreaForeground);
33
34 const QColor &lineNumberAreaBackground() const;
35 void setLineNumberAreaBackground(const QColor &newLineNumberAreaBackground);
36
37 const QColor &lineNumberAreaCurrentLine() const;
38 void setLineNumberAreaCurrentLine(const QColor &newLineNumberAreaCurrentLine);
39
40signals:
41 void lineNumberAreaCurrentLineChanged();
42
43protected:
44 void resizeEvent(QResizeEvent *event) override;
45
46private slots:
47 void updateLineNumberAreaWidth(int newBlockCount);
48 void highlightCurrentLine();
49 void updateLineNumberArea(const QRect &rect, int dy);
50
51private:
52 QWidget *lineNumberArea;
53 QColor mLineNumberAreaForeground;
54 QColor mLineNumberAreaBackground;
55 QColor mLineNumberAreaCurrentLine;
56};
57
58class LineNumberArea : public QWidget
59{
60public:
61 LineNumberArea(LineNumberTextEditor *editor) : QWidget(editor), mParentEditor(editor)
62 {}
63
64 QSize sizeHint() const override
65 {
66 return QSize(mParentEditor->lineNumberAreaWidth(), 0);
67 }
68
69protected:
70 void paintEvent(QPaintEvent *event) override
71 {
72 mParentEditor->lineNumberAreaPaintEvent(event);
73 }
74
75private:
76 LineNumberTextEditor *mParentEditor;
77};
78
79
80
81#endif // LINENUMBERTEXTEDITOR_H
82