我通过使用以下 C++ 类实现了类似的效果:
文本编辑.h
#ifndef TEXTEDIT_H
#define TEXTEDIT_H
#include <QTextEdit>
class TextEdit : public QTextEdit
{
Q_DISABLE_COPY( TextEdit )
public:
TextEdit( QWidget* parent = NULL );
TextEdit( const QString& text, QWidget* parent = NULL );
virtual ~TextEdit();
void fitToDocument( Qt::Orientations orientations );
virtual QSize sizeHint() const;
private:
int fittedHeight_;
Qt::Orientations fittedOrientations_;
int fittedWidth_;
};
#include "textedit-inl.h"
#endif // TEXTEDIT_H
文本编辑-inl.h
#ifndef TEXTEDITINL_H
#define TEXTEDITINL_H
#include "textedit.h"
inline TextEdit::TextEdit( QWidget* parent ) :
QTextEdit( parent ), fittedOrientations_( 0 )
{ }
inline TextEdit::TextEdit( const QString& text, QWidget* parent ) :
QTextEdit( text, parent ), fittedOrientations_( 0 )
{ }
inline TextEdit::~TextEdit()
{ }
inline QSize TextEdit::sizeHint() const
{
QSize sizeHint = QTextEdit::sizeHint();
if( fittedOrientations_ & Qt::Horizontal )
sizeHint.setWidth( fittedWidth_ );
if( fittedOrientations_ & Qt::Vertical )
sizeHint.setHeight( fittedHeight_ );
return sizeHint;
}
#endif // TEXTEDITINL_H
文本编辑.cpp
#include "textedit.h"
void TextEdit::fitToDocument( Qt::Orientations orientations )
{
QSize documentSize( document()->size().toSize() );
QSizePolicy sizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred );
if( orientations & Qt::Horizontal ) {
fittedWidth_ = documentSize.width() + (width() - viewport()->width());
sizePolicy.setHorizontalPolicy( QSizePolicy::Fixed );
}
if( orientations & Qt::Vertical ) {
fittedHeight_ = documentSize.height() + (width() - viewport()->width());
sizePolicy.setVerticalPolicy( QSizePolicy::Fixed );
}
fittedOrientations_ = orientations;
setSizePolicy( sizePolicy );
updateGeometry();
}
例如,调用TextEdit::fitToDocument( Qt::Horizontal )
会将小部件的宽度设置为一个固定宽度,该宽度正好足够大以适应文档及其周围环境(例如,垂直滚动条,如果有的话)。如果您的目标是在内容更改时发生这种情况,请将QTextEdit::textChanged()
信号连接到调用TextEdit::fitToDocument()
.
至于您的问题QLabel
,解决方案很简单:调用QLabel::setTextInteractionFlags( Qt::LinksAccessibleByMouse | Qt::TextSelectableByMouse )
.