如何在QLineEdit中更改部分文本的颜色?

时间:2013-01-19 18:19:28

标签: c++ qt user-interface

我想为在QLineEdit中编写的文本添加一些语法高亮,但它不支持富文本格式,我不能将QlineEdit更改为其他内容,所以我应该找到如何设置此小部件中文本的颜色。 / p>

有办法做到这一点吗?

3 个答案:

答案 0 :(得分:21)

刚刚找到了一个巧妙的技巧。

static void setLineEditTextFormat(QLineEdit* lineEdit, const QList<QTextLayout::FormatRange>& formats)
{
    if(!lineEdit)
        return;

    QList<QInputMethodEvent::Attribute> attributes;
    foreach(const QTextLayout::FormatRange& fr, formats)
    {
        QInputMethodEvent::AttributeType type = QInputMethodEvent::TextFormat;
        int start = fr.start - lineEdit->cursorPosition();
        int length = fr.length;
        QVariant value = fr.format;
        attributes.append(QInputMethodEvent::Attribute(type, start, length, value));
    }
    QInputMethodEvent event(QString(), attributes);
    QCoreApplication::sendEvent(lineEdit, &event);
}

static void clearLineEditTextFormat(QLineEdit* lineEdit)
{
    setLineEditTextFormat(lineEdit, QList<QTextLayout::FormatRange>());
}

// Usage example:
QLineEdit* lineEdit = new QLineEdit;
lineEdit->setText(tr("Task Tracker - Entry"));

QList<QTextLayout::FormatRange> formats;

QTextCharFormat f;

f.setFontWeight(QFont::Bold);
QTextLayout::FormatRange fr_task;
fr_task.start = 0;
fr_task.length = 4;
fr_task.format = f;

f.setFontItalic(true);
f.setBackground(Qt::darkYellow);
f.setForeground(Qt::white);
QTextLayout::FormatRange fr_tracker;
fr_tracker.start = 5;
fr_tracker.length = 7;
fr_tracker.format = f;

formats.append(fr_task);
formats.append(fr_tracker);

setLineEditTextFormat(lineEdit, formats);

答案 1 :(得分:2)

您可以使用style sheets更改颜色。

 QLineEdit* myLineEdit = new QLineEdit("Whatever");

 //for whatever case you want to change the color
 if(syntax_needs_to_highlighted)
      myLineEdit->setStyleSheet("QLineEdit#myLineEdit{color:blue}"); 

您可能需要考虑在这种情况下使用QTextBrowser

答案 2 :(得分:2)

你可以改变这样的文字颜色:

QLineEdit *line = new QLineEdit();
line->setText("this is a test");
line->setStyleSheet("foreground-color: blue;");

如果不起作用,请用以下内容替换最后一行:

line->setStyleSheet("color: blue;");