How to make QTextBrowser scale nicely within QVBoxLayout? - qt

Question

I'd like to display a list of short html snippets in a scrollable list. Thus i place a QVboxLayout into a QScrollArea and add multiple QTextBrowsers:
#include <QApplication>
#include <QScrollArea>
#include <QTextBrowser>
#include <QVBoxLayout>
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
QScrollArea scrollArea;
scrollArea.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
scrollArea.setWidgetResizable(true);
QWidget *scrollWidget = new QWidget;
QVBoxLayout *layout = new QVBoxLayout;
for(int i=0;i<6;i++) {
QString text = "some <b>text</b> ";
for(int j=0;j<i;j++) text += text;
QTextBrowser *browser = new QTextBrowser();
QTextDocument *doc = new QTextDocument(browser);
doc->setHtml(text);
browser->setDocument(doc);
layout->addWidget(browser);
}
scrollWidget->setLayout(layout);
scrollArea.setWidget(scrollWidget);
scrollArea.show();
return app.exec();
}
My problem: The boxes all have the same size. I want them to be as big as necessary, but not bigger. How can i make the textbrowsers to take only as much space as they really need?

Answer 1

Ok, i found a solution derived from http://www.qtcentre.org/threads/39839-QTextBrowser-height-adjusted-to-content. Is there a simpler/mor elegant solution?
#include <QApplication>
#include <QScrollArea>
#include <QTextBrowser>
#include <QVBoxLayout>
#include <QGroupBox>
#include <QDebug>
#include <QShowEvent>
#include <QResizeEvent>
class MyBrowser : public QTextBrowser {
private:
QTextDocument *doc;
public:
MyBrowser(const QString &text, QWidget *parent = 0) : QTextBrowser(parent) {
doc = new QTextDocument(this);
doc->setHtml(text);
setDocument(doc);
}
void adjust() {
QMargins margins = contentsMargins();
int width = size().width() -
margins.left() - margins.right() - doc->documentMargin()*2;
doc->setPageSize(QSizeF(width,-1));
int height = doc->size().height() + margins.top() + margins.bottom();
setMaximumHeight(height);
setMinimumHeight(height);
}
void showEvent(QShowEvent *) {
adjust();
}
void resizeEvent(QResizeEvent *) {
adjust();
}
};
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
QScrollArea scrollArea;
scrollArea.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
scrollArea.setWidgetResizable(true);
QWidget *scrollWidget = new QWidget;
QVBoxLayout *layout = new QVBoxLayout;
for(int i=0;i<6;i++) {
QString text = "some <b>text</b> ";
for(int j=0;j<i;j++) text += text;
MyBrowser *browser = new MyBrowser(text, scrollWidget);
layout->addWidget(browser, 0, 0);
}
scrollWidget->setLayout(layout);
scrollArea.setWidget(scrollWidget);
scrollArea.show();
return app.exec();
}

Answer 2

Instead of doing
layout->addWidget(browser);
You should do:
layout->addWidget(browser, 0, 0);
This will tell QT not to stretch the widget according to its layout.