C++ 文本颜色QPlainTextEdit QT
我有课C++ 文本颜色QPlainTextEdit QT,c++,qt,qt5,C++,Qt,Qt5,我有课 class plainTextEditor: public QPlainTextEdit { Q_OBJECT public: void setTextColor(const QColor &c); // default function setTextColor(const QColor &c) from QTextEdit { QTextCharFormat fmt; fmt.setForeground(QBrush(c))
class plainTextEditor: public QPlainTextEdit
{
Q_OBJECT
public:
void setTextColor(const QColor &c); // default function setTextColor(const QColor &c) from QTextEdit
{
QTextCharFormat fmt;
fmt.setForeground(QBrush(c));
this->mergeCurrentCharFormat(fmt);
}
};
以及:
我在开始窗口构造函数中使用以下代码:
ui->mainText->setTextColor(Qt::red);
但如果我删除所有文本并再次写入,文本颜色将返回黑色。
我尝试修复:
connect(ui->mainText, &QPlainTextEdit::textChanged, [this](){
ui->mainText->setTextColor(Qt::red);
};
但是,如果我选择所有文本并粘贴,部分文本颜色为黑色如果您的目标是简单地设置所有文本的颜色,那么您可以使用Qt样式表 以下示例将背景色更改为黑色,文本颜色更改为红色:
QPlainTextEdit *edit = new QPlainTextEdit(this);
//StyleSheet here
edit->setStyleSheet("QPlainTextEdit {background-color: black; color: red;}");
edit->appendPlainText("HELLO!");
编辑:不使用样式表:
QPlainTextEdit *edit = new QPlainTextEdit(this);
//Here we are using the HTML capabilities of Qt
//Converting the string using toHtmlEscaped to allow html special characters to be displayed
//Using blockSignals to not generate loop on text manipulation
//Using <pre> tag to allow multiple spaces
connect(edit, &QPlainTextEdit::textChanged, this, [=]{
const QString plainText = edit->toPlainText().toHtmlEscaped();
edit->blockSignals(true);
edit->clear();
edit->appendHtml("<p style=\"color:red;white-space:pre\">" + plainText + "</p>"
edit->blockSignals(false);
});
edit->appendPlainText("HELLO!");
我不能使用样式表我不能使用编辑->追加HTML
+纯文本+
@跳过:这是一个HTML特性,在我的编辑中用as环绕文本。QPlainTextEdit *edit = new QPlainTextEdit(this);
//Here we are using the HTML capabilities of Qt
//Converting the string using toHtmlEscaped to allow html special characters to be displayed
//Using blockSignals to not generate loop on text manipulation
//Using <pre> tag to allow multiple spaces
connect(edit, &QPlainTextEdit::textChanged, this, [=]{
const QString plainText = edit->toPlainText().toHtmlEscaped();
edit->blockSignals(true);
edit->clear();
edit->appendHtml("<p style=\"color:red;white-space:pre\">" + plainText + "</p>"
edit->blockSignals(false);
});
edit->appendPlainText("HELLO!");