Image cannot occupy full cell in QTextTable if the cell is a result of cell merge. What can I do?

Pauly

I created a QTextTable in QTextEdit. There are a few rows and columns in QTextTable and each column has a set width using QTextTableFormat. In one of the rows I merge all the cells and insert an image to that merged cell. The image will never occupy the full width of the merged cell, there is always a space between image to the right border. If I increase the image size, the right border of table moves too.

I try to put the image in a non-merged cell, and the image will go wall to wall in that cell. So I guess the problem has something to do with cell merging...

I save the QTextEdit as html and open that in a browser, the image is actually occupying full width of the merged cell.

What can I do to get image to go wall to wall in a merged cell in QTextTable?

SGaist

Hi and welcome to devnet,

Can you provide a minimal sample code that reproduce this behaviour ?

By the way, what size is the image ?

Pauly

OK, please try this:

First, save https://www.apple.com/ac/structured-data/images/knowledge_graph_logo.png to local (example below at c:/), then:

QVector<QTextLength> columnWidth;
for(int i = 0; i < 20; ++i)
    columnWidth.append(QTextLength(QTextLength::FixedLength, 50));

QTextTableFormat *tableFormat = new QTextTableFormat();
tableFormat->setColumnWidthConstraints(columnWidth);
QTextTable* newTable=cursor.insertTable(1, 20, *tableFormat);

newTable->mergeCells(0,1,1,7);
newTable->mergeCells(0,12,1,4);

QTextDocumentFragment fragment;
fragment = QTextDocumentFragment::fromHtml("<img src='c:/knowledge_graph_logo.png'>");

QTextCursor cursor2 = newTable->cellAt(0, 2).firstCursorPosition();
cursor2.insertFragment(fragment);

cursor2 = newTable->cellAt(0, 9).firstCursorPosition();
cursor2.insertFragment(fragment);

The first insert into a merged cell, there is always space to the right to the cell all. The second insert into a non-merged cell and image is wall to wall in cell. Please let me know if any other question. Thanks!

SGaist

Thanks but can you provide a more complete minimal sample ? i.e. here we are missing the QTextDocument
setup, the widget used to show said text document etc.

On a side note, there's no need to allocation tableFormat on the heap just do it on th stack.

Pauly

How about this?

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTextTableCell>
#include <QTextEdit>
#include <QTextCursor>
#include <QTextDocumentFragment>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"



MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QTextEdit* textEdit = new QTextEdit(this);
    setCentralWidget(textEdit);

    QTextCursor cursor = textEdit->textCursor();

    QVector<QTextLength> columnWidth;
    for(int i = 0; i < 20; ++i)
        columnWidth.append(QTextLength(QTextLength::FixedLength, 50));

    QTextTableFormat *tableFormat = new QTextTableFormat();
    tableFormat->setColumnWidthConstraints(columnWidth);
    QTextTable* newTable=cursor.insertTable(1, 20, *tableFormat);

    newTable->mergeCells(0,1,1,7);
    newTable->mergeCells(0,12,1,4);

    QTextDocumentFragment fragment;
    fragment = QTextDocumentFragment::fromHtml("<img src='c:/knowledge_graph_logo.png'>");

    QTextCursor cursor2 = newTable->cellAt(0, 2).firstCursorPosition();
    cursor2.insertFragment(fragment);

    cursor2 = newTable->cellAt(0, 9).firstCursorPosition();
    cursor2.insertFragment(fragment);


}

MainWindow::~MainWindow()
{
    delete ui;
}

SGaist

Thanks, it's likely a bug in the rendering of the html fragment. You should check the bug report system to see if there's anything related.