Qt-文本编辑相关设置

       QTextEdit由QTextDocument作为载体，光标QTextCursor类提供了对QTextDocument文档的修改接口，所有对文档格式的修改都与光标有关

1. 设置字体

QTextCharFormat textCharFormat;
textCharFormat.setFontFamily("字体名称");  //选择的字体名称设置给QTextCharFormat对象
QTextCursor textCursor = textEdit->textCursor();  //获得编辑框中的光标
if(!textCursor.hasSelection())  //若光标没有高亮选区，则将光标所在处的词作为选区，由前后空格或",""."等标点符号区分词
{
    textCursor.select(QTextCursor::WordUnderCursor);
}

textCursor.mergeCharFormat(textCharFormat);  //将参数format所表示的格式应用到光标所在处的字符上
textEdit->mergeCurrentCharFormat(textCharFormat);  //将格式应用到选区内的所有字符上

2. 设置字号

QTextCharFormat textCharFormat;
textCharFormat.setFontPointSize(11);
textEdit->mergeCurrentCharFormat(textCharFormat);

3. 设置文字加粗

QTextCharFormat textCharFormat;
textCharFormat.setFontWeight(QFont::Bold);
textEdit->mergeCurrentCharFormat(textCharFormat);

4. 设置文字斜体

QTextCharFormat textCharFormat;
textCharFormat.setFontItalic(true);
textEdit->mergeCurrentCharFormat(textCharFormat);

5. 设置文字加下划线

QTextCharFormat textCharFormat;
textCharFormat.setFontUnderline(true);
textEdit->mergeCurrentCharFormat(textCharFormat);

6. 设置文字颜色

QTextCharFormat textCharFormat;
textCharFormat.setForeground(Qt::red);
textEdit->mergeCurrentCharFormat(textCharFormat);