Menu
I have a SQLite-Database and I did it into a QSqlTableModel.
To show the Database, I put that Model into a QTableView.
Now I want to create a Method where the selected Rows (or the whole Line) will be copied into the QClipboard. After that I want to insert it into my OpenOffice.Calc-Document.
But I have no Idea what to do with the Selected SIGNAL and the QModelIndex and how to put this into the Clipboard.
748
To actually capture the selection you use the item view's selection model to get a list of indices. Given that you have a QTableView * called view you get the selection this way:
QAbstractItemModel * model = view->model();
QItemSelectionModel * selection = view->selectionModel();
QModelIndexList indexes = selection->selectedIndexes();
Then loop through the index list calling model->data(index) on each index. Convert the data to a string if it isn't already and concatenate each string together. Then you can use QClipboard.setText to paste the result to the clipboard. Note that, for Excel and Calc, each column is separated from the next by a newline ("\n") and each row is separated by a tab ("\t"). You have to check the indices to determine when you move to the next row.
QString selected_text;
// You need a pair of indexes to find the row changes
QModelIndex previous = indexes.first();
indexes.removeFirst();
foreach(const QModelIndex ¤t, indexes)
{
QVariant data = model->data(current);
QString text = data.toString();
// At this point `text` contains the text in one cell
selected_text.append(text);
// If you are at the start of the row the row number of the previous index
// isn't the same. Text is followed by a row separator, which is a newline.
if (current.row() != previous.row())
{
selected_text.append('\n');
}
// Otherwise it's the same row, so append a column separator, which is a tab.
else
{
selected_text.append('\t');
}
previous = current;
}
QApplication.clipboard().setText(selected_text);
Warning: I have not had a chance to try this code, but a PyQt equivalent works.
197
I had a similar problem and ended up adapting QTableWidget (which is an extension of QTableView) to add copy/paste functionality. Here is the code which builds on what was provided by quark above:
qtablewidgetwithcopypaste.h
// QTableWidget with support for copy and paste added
// Here copy and paste can copy/paste the entire grid of cells
#ifndef QTABLEWIDGETWITHCOPYPASTE_H
#define QTABLEWIDGETWITHCOPYPASTE_H
#include <QTableWidget>
#include <QKeyEvent>
#include <QWidget>
class QTableWidgetWithCopyPaste : public QTableWidget
{
Q_OBJECT
public:
QTableWidgetWithCopyPaste(int rows, int columns, QWidget *parent = 0) :
QTableWidget(rows, columns, parent)
{}
QTableWidgetWithCopyPaste(QWidget *parent = 0) :
QTableWidget(parent)
{}
private:
void copy();
void paste();
public slots:
void keyPressEvent(QKeyEvent * event);
};
#endif // QTABLEWIDGETWITHCOPYPASTE_H
qtablewidgetwithcopypaste.cpp
#include "qtablewidgetwithcopypaste.h"
#include <QApplication>
#include <QMessageBox>
#include <QClipboard>
#include <QMimeData>
void QTableWidgetWithCopyPaste::copy()
{
QItemSelectionModel * selection = selectionModel();
QModelIndexList indexes = selection->selectedIndexes();
if(indexes.size() < 1)
return;
// QModelIndex::operator < sorts first by row, then by column.
// this is what we need
// std::sort(indexes.begin(), indexes.end());
qSort(indexes);
// You need a pair of indexes to find the row changes
QModelIndex previous = indexes.first();
indexes.removeFirst();
QString selected_text_as_html;
QString selected_text;
selected_text_as_html.prepend("<html><style>br{mso-data-placement:same-cell;}</style><table><tr><td>");
QModelIndex current;
Q_FOREACH(current, indexes)
{
QVariant data = model()->data(previous);
QString text = data.toString();
selected_text.append(text);
text.replace("\n","<br>");
// At this point `text` contains the text in one cell
selected_text_as_html.append(text);
// If you are at the start of the row the row number of the previous index
// isn't the same. Text is followed by a row separator, which is a newline.
if (current.row() != previous.row())
{
selected_text_as_html.append("</td></tr><tr><td>");
selected_text.append(QLatin1Char('\n'));
}
// Otherwise it's the same row, so append a column separator, which is a tab.
else
{
selected_text_as_html.append("</td><td>");
selected_text.append(QLatin1Char('\t'));
}
previous = current;
}
// add last element
selected_text_as_html.append(model()->data(current).toString());
selected_text.append(model()->data(current).toString());
selected_text_as_html.append("</td></tr>");
QMimeData * md = new QMimeData;
md->setHtml(selected_text_as_html);
// qApp->clipboard()->setText(selected_text);
md->setText(selected_text);
qApp->clipboard()->setMimeData(md);
// selected_text.append(QLatin1Char('\n'));
// qApp->clipboard()->setText(selected_text);
}
void QTableWidgetWithCopyPaste::paste()
{
if(qApp->clipboard()->mimeData()->hasHtml())
{
// TODO, parse the html data
}
else
{
QString selected_text = qApp->clipboard()->text();
QStringList cells = selected_text.split(QRegExp(QLatin1String("\\n|\\t")));
while(!cells.empty() && cells.back().size() == 0)
{
cells.pop_back(); // strip empty trailing tokens
}
int rows = selected_text.count(QLatin1Char('\n'));
int cols = cells.size() / rows;
if(cells.size() % rows != 0)
{
// error, uneven number of columns, probably bad data
QMessageBox::critical(this, tr("Error"),
tr("Invalid clipboard data, unable to perform paste operation."));
return;
}
if(cols != columnCount())
{
// error, clipboard does not match current number of columns
QMessageBox::critical(this, tr("Error"),
tr("Invalid clipboard data, incorrect number of columns."));
return;
}
// don't clear the grid, we want to keep any existing headers
setRowCount(rows);
// setColumnCount(cols);
int cell = 0;
for(int row=0; row < rows; ++row)
{
for(int col=0; col < cols; ++col, ++cell)
{
QTableWidgetItem *newItem = new QTableWidgetItem(cells[cell]);
setItem(row, col, newItem);
}
}
}
}
void QTableWidgetWithCopyPaste::keyPressEvent(QKeyEvent * event)
{
if(event->matches(QKeySequence::Copy) )
{
copy();
}
else if(event->matches(QKeySequence::Paste) )
{
paste();
}
else
{
QTableWidget::keyPressEvent(event);
}
}
Quark's answer (the selected one) is good for pointing people in the right direction, but his algorithm is entirely incorrect. In addition to an off by one error and incorrect assignment, its not even syntactically correct. Below is a working version that I just wrote and tested.
Let's assume our example table looks like so:
A | B | C
D | E | F
The problem with Quark's algorithm is the following:
If we replace his \t separator with a ' | ', it will produce this output:
B | C | D
E | F |
The off by one error is that D appears in the first row. The incorrect assignment is evidenced by the omission of A
The following algorithm corrects these two problems with correct syntax.
QString clipboardString;
QModelIndexList selectedIndexes = view->selectionModel()->selectedIndexes();
for (int i = 0; i < selectedIndexes.count(); ++i)
{
QModelIndex current = selectedIndexes[i];
QString displayText = current.data(Qt::DisplayRole).toString();
// If there exists another column beyond this one.
if (i + 1 < selectedIndexes.count())
{
QModelIndex next = selectedIndexes[i+1];
// If the column is on different row, the clipboard should take note.
if (next.row() != current.row())
{
displayText.append("\n");
}
else
{
// Otherwise append a column separator.
displayText.append(" | ");
}
}
clipboardString.append(displayText);
}
QApplication::clipboard()->setText(clipboardString);
The reason I chose to use a counter instead of an iterator is just because it is easier to test if there exists another index by checking against the count. With an iterator, I suppose maybe you could just increment it and store it in a weak pointer to test if it is valid but just use a counter like I did above.
We need to check if the next line will be on on a new row. If we are on a new row and we check the previous row as Quark's algorithm does, its already too late to append. We could prepend, but then we have to keep track of the last string size. The above code will produce the following output from the example table:
A | B | C
D | E | F
8
For whatever reason I didn't have access to the std::sort function, however I did find that as a neat alternative to Corwin Joy's solution, the sort function can be implemented by replacing
std::sort(indexes.begin(), indexes.end());
with
qSort(indexes);
This is the same as writing:
qSort(indexes.begin(), indexes.end());
Thanks for your helpful code guys!
4
I wrote some code based on some of the others' answers. I subclassed QTableWidget and overrode keyPressEvent() to allow the user to copy the selected rows to the clipboard by typing Control-C.
void MyTableWidget::keyPressEvent(QKeyEvent* event) {
// If Ctrl-C typed
if (event->key() == Qt::Key_C && (event->modifiers() & Qt::ControlModifier))
{
QModelIndexList cells = selectedIndexes();
qSort(cells); // Necessary, otherwise they are in column order
QString text;
int currentRow = 0; // To determine when to insert newlines
foreach (const QModelIndex& cell, cells) {
if (text.length() == 0) {
// First item
} else if (cell.row() != currentRow) {
// New row
text += '\n';
} else {
// Next cell
text += '\t';
}
currentRow = cell.row();
text += cell.data().toString();
}
QApplication::clipboard()->setText(text);
}
}
Output example (tab-separated):
foo bar baz qux
bar baz qux foo
baz qux foo bar
qux foo bar baz
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
