如何在QLineEdit中更改部分文本的颜色？ [英] How can I change color of part of the text in QLineEdit?

问题描述

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化，我不能改变QlineEdit为其他东西，所以我应该找到如何设置文本的颜色在这个小部件。 / p>

有办法吗？

解决方案

  static void setLineEditTextFormat（QLineEdit * lineEdit，const QList< QTextLayout :: FormatRange>& formats）
 {
 if（！lineEdit）
 return; 
 
 QList< QInputMethodEvent :: Attribute>属性; 
 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事件（QString（），attributes）; 
 QCoreApplication :: sendEvent（lineEdit，& event）; 
} 
 
 static void clearLineEditTextFormat（QLineEdit * lineEdit）
 {
 setLineEditTextFormat（lineEdit，QList< QTextLayout :: FormatRange>（））; 
} 
 
 //用法示例：
 QLineEdit * lineEdit = new QLineEdit; 
 lineEdit-> setText（tr（Task Tracker  -  Entry））; 
 
 QList< QTextLayout :: FormatRange>格式; 
 
 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）; 
 
 customizeLineEditText（lineEdit，formats）; 
  

I want to add some syntax highlighting to text being written in QLineEdit, but it does not support rich text formatting, I can not change QlineEdit to something else, so I should find how to set color of text in this widget.

Is there a way to do this?

解决方案

Just found a neat trick for that.

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);

customizeLineEditText(lineEdit, formats);

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