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Implementing QTreeView in QComboBox using Qt- Part 2

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Article Metadata
Tested with
Devices(s): S60 Emulator
Compatibility
Platform(s): Qt
Symbian
Article
Keywords: QComboBox,QTreeView,QDirModel
Created: mind_freak (31 Jul 2009)
Last edited: hamishwillee (11 Oct 2012)

Contents

Introduction

This code demonstrates the QTreeView implemented in QComboBox. Here you can expand the tree view and also select the file you want, no restriction of QComboBox closing on one click, you can select items upto any level.

Name of classed used:

QTreeView-Provides a default model/view implementation of a tree view.

QDirModel-Provides a data model for the local file system.

Source Code

#include <QtGui/QApplication>
#include "widget.h"
#include<QComboBox>
#include<QDirModel>
#include<QTreeView>
#include<QEvent>
#include<QMouseEvent>
#include<QModelIndex>
#include<QDir>
class TreeBox : public QComboBox
{
public:
TreeBox(QWidget* parent = 0) : QComboBox(parent), skipNextHide(false) //Widget creation
{
setView(new QTreeView(this));
view()->viewport()->installEventFilter(this);
QComboBox::resize(200,30);
}
 
bool eventFilter(QObject* object, QEvent* event)
{
if (event->type() == QEvent::MouseButtonPress && object == view()->viewport())
{
QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(event);
QModelIndex index = view()->indexAt(mouseEvent->pos());
if (!view()->visualRect(index).contains(mouseEvent->pos()))
skipNextHide = true;
}
return false;
}
 
virtual void showPopup()
{
setRootModelIndex(static_cast<QDirModel*>(model())->index(QDir::rootPath()));
QComboBox::showPopup();
}
 
virtual void hidePopup()
{
setRootModelIndex(view()->currentIndex().parent());
setCurrentIndex(view()->currentIndex().row());
if (skipNextHide)
skipNextHide = false;
else
QComboBox::hidePopup();
}
 
private:
bool skipNextHide;
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
TreeBox combo; //Class object declaration
QDirModel model;
combo.setModel(&model); //implemention QDir model
combo.show();
return a.exec();
}

Screenshot

Treecombo.JPG

Related Links

Implementing QTreeView in QComboBox using Qt- Part 1

This page was last modified on 11 October 2012, at 01:17.
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