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.

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