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Qt-interest Archive, September 2002
Multiple QListViews in a QScrollView

Message 1 in thread

I've only been using QT a few months.  I'm currently using version 3.0.5
under windows 2000.

Anyway, I am trying to design an application whereby two or more QListViews
of varying sizes are all navigated by a single vertical scrollbar (each with
their own individual horizontal scrollbar, if possible).

I was wondering if this was possible - I have been experimenting by adding
two QlistViews to a single QScrollView with little success apart from hiding
the vertical bars of each QListView.

Thanks in advance
Mark Stephens
Message 2 in thread

On Mon, 2 Sep 2002 15:43:05 +0100 
Mark Stephens <mark.stephens@microtest.co.uk> wrote:

> Anyway, I am trying to design an application whereby two or more
> QListViews of varying sizes are all navigated by a single vertical
> scrollbar (each with their own individual horizontal scrollbar, if
> possible).
> 
> I was wondering if this was possible - I have been experimenting by
> adding two QlistViews to a single QScrollView with little success apart
> from hiding the vertical bars of each QListView.

I am not sure whether this is what you want, but here is a small class I
slapped together quickly that will sync two scrollviews together
vertically - each view still has free horizontal scrolling. It should be
easy enough to adapt it for an arbitrary number of views.

--+--

class QSyncer : public QObject {
    Q_OBJECT
public:
    QSyncer(QScrollView* s1, QScrollView* s2);

public slots:
    void moving1(int x, int y);
    void moving2(int x, int y);

protected:
    QScrollView* s1_;
    QScrollView* s2_;
};

--+--

QSyncer::QSyncer(QScrollView* s1, QScrollView* s2) : s1_(s1), s2_(s2) {
    connect(s1, SIGNAL(contentsMoving(int, int)), this, SLOT(moving1(int,
        int)));
    connect(s2, SIGNAL(contentsMoving(int, int)), this, SLOT(moving2(int,
        int)));
}

void QSyncer::moving1(int x, int y) {
    bool blocked = s2_->signalsBlocked();
    s2_->blockSignals(true);
    s2_->setContentsPos(s2_->contentsX(), y);
    s2_->blockSignals(blocked);
}

void QSyncer::moving2(int x, int y) {
    bool blocked = s1_->signalsBlocked();
    s1_->blockSignals(true);
    s1_->setContentsPos(s1_->contentsX(), y);
    s1_->blockSignals(blocked);
}

--+--

#include <qapplication.h>
#include <qhbox.h>
#include <qlistview.h>

#include "qsyncer.h"

int main(int argc, char** argv) {
    QApplication app(argc, argv);

    QHBox* box = new QHBox;
    app.setMainWidget(box);

    QListView* list1 = new QListView(box);
    list1->addColumn("Foo");
    QListView* list2 = new QListView(box);
    list2->addColumn("Bar");
    
    for (int i = 0; i < 20; i++) {
        QString s;
        s.sprintf("Item #%d for list 1", i);
        new QListViewItem(list1, s);
        s.sprintf("Item #%d for list 2", i);
        new QListViewItem(list2, s);
    }

    new QSyncer(list1, list2);

    box->show();

    return app.exec();
}

-- 
 [ signature omitted ]