Inserting Images from directory in QTableWidget

Question

Well, hi all. I've got a question. I have a QTableWidget where I need put images from directory and retrieve name of image that was in selected cell. How can it automatically generate number of rows and columns depending of number of files in directory? I can add image to table by hand but it's not that i want to do. I suppose it's must be something with

QDir dir("images/");
QFileInfoList dirContent = dir.entryInfoList(QStringList()<< "*.png", QDir::Files | 
QDir::NoDotAndDotDot);

But still can't figure how can I do this.

Answer 1

There are two approaches.

Non-recursive

main.cpp

#include <QDir>
#include <QFileInfo>
#include <QTableWidget>
#include <QPixmap>
#include <QApplication>

int main(int argc, char **argv)
{
    QApplication application(argc, argv);
    QTableWidget tableWidget(100, 5);
    QDir dir("images/");
    for (const auto& fileInfo : dir.entryInfoList(QStringList{"*.png"}, QDir::Files | QDir::NoDotAndDotDot))
    {
        static int row = 0, column = 0;
        QTableWidgetItem *newItem = new QTableWidgetItem(QObject::tr("%1").arg((row+1)*(column+1)));
        newItem->setData(Qt::DecorationRole, QPixmap(fileInfo.absoluteFilePath()));
        tableWidget.setItem(row, column, newItem);
        if (column == tableWidget.columnCount()) {
            column = 0;
            row++;
        }
    }
    tableWidget.show();
    return application.exec();
}

main.pro

TEMPLATE = app
TARGET = main
QT += widgets
CONFIG += c++11
SOURCES += main.cpp

Build and Run

qmake && make && ./main

Recursive

main.cpp

#include <QDir>
#include <QDirIterator>
#include <QFileInfo>
#include <QTableWidget>
#include <QPixmap>
#include <QApplication>

int main(int argc, char **argv)
{
    QApplication application(argc, argv);
    QTableWidget tableWidget(100, 5);
    QDir dir("images/");
    dir.setFilter(QDir::NoDotAndDotDot| QDir::Files);
    QDirIterator it(dir, QDirIterator::Subdirectories);
    while (it.hasNext()) {
        static int row = 0, column = 0;
        it.next();
        QFileInfo Info = it.fileInfo();
        QString path = Info.absolutePath();
        if(Info.isFile() && path.endsWith(".png")) {
            QTableWidgetItem *newItem = new QTableWidgetItem(QObject::tr("%1").arg((row+1)*(column+1)));
            newItem->setData(Qt::DecorationRole, QPixmap(path));
            tableWidget.setItem(row, column, newItem);
            if (column == tableWidget.columnCount()) {
                column = 0;
                row++;
            }
        }
    }
    tableWidget.show();
    return application.exec();
}

main.pro

TEMPLATE = app
TARGET = main
QT += widgets
CONFIG += c++11
SOURCES += main.cpp

Build and Run

qmake && make && ./main

Answer 2

QFileInfoList is just a QList<QFileInfo>, so you can easily get size of this list. Use something like this:

QDir dir("G:/2");
QFileInfoList dirContent = dir.entryInfoList(QStringList()<< "*.png", QDir::Files |
QDir::NoDotAndDotDot);

ui->tableWidget->setColumnCount(1);
ui->tableWidget->setRowCount(dirContent.size());

for(int i=0; i < dirContent.size(); i++)
{
    qDebug() << dirContent.at(i).absoluteFilePath();
    ui->tableWidget->item(i,0)->setData(Qt::DecorationRole, QPixmap(dirContent.at(i).absoluteFilePath()));
}

Also you can scale your image with scale() method and use:

ui->tableWidget->resizeRowsToContents();