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50
51 //! [0]
52 QTextEdit *editor = new QTextEdit;
53 MyHighlighter *highlighter = new MyHighlighter(editor->document());
54 //! [0]
55
56
57 //! [1]
highlightBlock(const QString & text)58 void MyHighlighter::highlightBlock(const QString &text)
59 {
60 QTextCharFormat myClassFormat;
61 myClassFormat.setFontWeight(QFont::Bold);
62 myClassFormat.setForeground(Qt::darkMagenta);
63
64 QRegularExpression expression("\\bMy[A-Za-z]+\\b");
65 QRegularExpressionMatchIterator i = expression.globalMatch(text);
66 while (i.hasNext())
67 {
68 QRegularExpressionMatch match = i.next();
69 setFormat(match.capturedStart(), match.capturedLength(), myClassFormat);
70 }
71 }
72 //! [1]
73
74
75 //! [2]
76 QTextCharFormat multiLineCommentFormat;
77 multiLineCommentFormat.setForeground(Qt::red);
78
79 QRegularExpression startExpression("/\\*");
80 QRegularExpression endExpression("\\*/");
81
82 setCurrentBlockState(0);
83
84 int startIndex = 0;
85 if (previousBlockState() != 1)
86 startIndex = text.indexOf(startExpression);
87
88 while (startIndex >= 0) {
89 QRegularExpressionMatch endMatch;
90 int endIndex = text.indexOf(endExpression, startIndex, &endMatch);
91 int commentLength;
92 if (endIndex == -1) {
93 setCurrentBlockState(1);
94 commentLength = text.length() - startIndex;
95 } else {
96 commentLength = endIndex - startIndex
97 + endMatch.capturedLength();
98 }
99 setFormat(startIndex, commentLength, multiLineCommentFormat);
100 startIndex = text.indexOf(startExpression,
101 startIndex + commentLength);
102 }
103 //! [2]
104
105
106 //! [3]
107 struct ParenthesisInfo
108 {
109 QChar char;
110 int position;
111 };
112
113 struct BlockData : public QTextBlockUserData
114 {
115 QVector<ParenthesisInfo> parentheses;
116 };
117 //! [3]
118