具有不同文本颜色的 QTextEdit (Qt / C++)
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QTextEdit with different text colors (Qt / C++)
提问by user924
I have a QTextEditbox that displays text, and I'd like to be able to set the text color for different lines of text in the same QTextEditbox. (i.e. line 1 might be red, line 2 might be black, etc.)
我有一个QTextEdit显示文本的框，我希望能够在同一个QTextEdit框中为不同的文本行设置文本颜色。（即第 1 行可能是红色，第 2 行可能是黑色等）
Is this possible in a QTextEditbox? If not, what's the easiest way to get this behavior?
这可能在一个QTextEdit盒子里吗？如果没有，获得这种行为的最简单方法是什么？
Thanks.
谢谢。
采纳答案by mosg
Use text formated as HTML, for example:
使用格式为 HTML 的文本，例如：
textEdit->setHtml(text);
where text, is a HTML formated text, contains with colored lines and etc.
其中text，是 HTML 格式的文本，包含彩色线条等。
回答by paie
The ONLYthing that worked for me was html.
该只为我工作的事情是HTML。
Code snippet follows.
代码片段如下。
QString line = "contains some text from somewhere ..."
:
:
QTextCursor cursor = ui->messages->textCursor();
QString alertHtml = "<font color=\"DeepPink\">";
QString notifyHtml = "<font color=\"Lime\">";
QString infoHtml = "<font color=\"Aqua\">";
QString endHtml = "</font><br>";
switch(level)
{
case msg_alert: line = alertHtml % line; break;
case msg_notify: line = notifyHtml % line; break;
case msg_info: line = infoHtml % line; break;
default: line = infoHtml % line; break;
}
line = line % endHtml;
ui->messages->insertHtml(line);
cursor.movePosition(QTextCursor::End);
ui->messages->setTextCursor(cursor);
回答by badgerr
Just a quick addition: an alternative to generating the html yourself, if you're populating the text box programatically, is to use textEdit->setTextColor(QColor&). You can create the QColor object yourself, or use one of the predefined colours in the Qt namespace (Qt::black, Qt::red, etc). It will apply the specified colour to any text you add, until it is called again with a different one.
只是一个快速补充：如果您以编程方式填充文本框，则可以使用textEdit->setTextColor(QColor&). 您可以自己创建 QColor 对象，或使用 Qt 命名空间中的预定义颜色之一（Qt::black、Qt::red 等）。它会将指定的颜色应用于您添加的任何文本，直到使用不同的颜色再次调用它。
回答by none
A few quotes:
几句话：
QTextEdit is an advanced WYSIWYG viewer/editor supporting rich text formatting using HTML-style tags. It is optimized to handle large documents and to respond quickly to user input.
QTextEdit 是一个先进的 WYSIWYG 查看器/编辑器，支持使用 HTML 样式标签的富文本格式。它经过优化，可处理大型文档并快速响应用户输入。
.
.
The text edit can load both plain text and HTML files (a subset of HTML 3.2 and 4).
文本编辑器可以加载纯文本和 HTML 文件（HTML 3.2 和 4 的子集）。
.
.
QTextEdit can display a large HTML subset, including tables and images.
QTextEdit 可以显示一个大的 HTML 子集，包括表格和图像。
This means mostly deprecated tags and as such does not include any current CSS, so I turned to this:
这意味着大多数已弃用的标签，因此不包含任何当前的 CSS，所以我转向了这个：
// save
int fw = ui->textEdit->fontWeight();
QColor tc = ui->textEdit->textColor();
// append
ui->textEdit->setFontWeight( QFont::DemiBold );
ui->textEdit->setTextColor( QColor( "red" ) );
ui->textEdit->append( entry );
// restore
ui->textEdit->setFontWeight( fw );
ui->textEdit->setTextColor( tc );
回答by handle
Extending on https://stackoverflow.com/a/13287446/1619432:
在https://stackoverflow.com/a/13287446/1619432 上扩展：
QTextEdit::append()inserts a new paragraph with the previously set FontWeight / TextColor.
insertHTML()or InsertPlainText()to avoid inserting a new paragraph (e.g. to achieve different formats in a single line) do not respect the font/color settings.
QTextEdit::append()使用先前设置的 FontWeight / TextColor 插入一个新段落。
insertHTML()或者InsertPlainText()为了避免插入一个新段落（例如，在一行中实现不同的格式）不尊重字体/颜色设置。
Instead use QTextCursor:
而是使用QTextCursor：
...
// textEdit->moveCursor( QTextCursor::End );
QTextCursor cursor( textEdit->textCursor() );
QTextCharFormat format;
format.setFontWeight( QFont::DemiBold );
format.setForeground( QBrush( QColor( "black" ) ) );
cursor.setCharFormat( format );
cursor.insertText( "Hello world!" );
...
回答by Saeid Yazdani
This is my solution for a very simple error logging using QTextEdit.
这是我使用 QTextEdit 进行非常简单的错误记录的解决方案。
// In some common header file
enum class ReportLevel {
Info,
Warning,
Error
};
// Signal in classes who report something
void reportStatus(ReportLevel level,
const QString& tag,
const QString& report);
// Slot in the class which receives the reports
void MyGreatClass::handleStatusReport(ReportLevel level,
const QString& tag,
const QString& report)
{
switch(level) {
case ReportLevel::Info:
mTeReports->setTextColor(Qt::blue);
break;
case ReportLevel::Warning:
mTeReports->setTextColor(QColor::fromRgb(255, 165, 0)); // Orange
break;
case ReportLevel::Error:
mTeReports->setTextColor(Qt::red);
break;
}
// mTeReoports is just an instance of QTextEdit
mTeReports->insertPlainText(tag + "\t");
mTeReports->setTextColor(Qt::black); // set color back to black
// might want ot use #ifdef for windows or linux....
mTeReports->insertPlainText(report + "\r\n");
// Force the scroll bar (if visible) to jump to bottom
mTeReports->ensureCursorVisible();
}
This is how it looks like:
这是它的样子：
Of course, you can go ahead and add date/time and other cool stuff :)
当然，您可以继续添加日期/时间和其他很酷的东西:)
