i want to display some of the content of my array in a List Widget (item based) with Qt and C++, i tried this, but it dosent work :
QString exemple[2] = 'blablabla'
ui->listWidgetResult->addItem(exemple[2].toStdString().c_str());
Thanks !
This can't work:
QString example[2] = 'blablabla'
First, ' is for char values, not for strings. Second, you are declaring an array of two QStrings, but assign it to a C string. What you mean is perhaps this:
QString example[2] = {"blabla", "blabla"};
Which you can actually abbreviate to:
QString example[] = {"blabla", "blabla"};
To add each string of the array to your list widget, you need to add each one individually. Also, there's no need to convert to a C string. QListWidget::addItem() takes QStrings:
for (int i = 0; i < sizeof(example); ++i) {
ui->listWidgetResult->addItem(exemple[i]);
}
Or, if you have a recent compiler that supports C++-11:
for (const auto& str : example) {
ui->listWidgetResult->addItem(str);
}
Finally, instead of using plain arrays to hold your QStrings, you should instead consider holding them in a QStringList. You can then simply pass the whole QStringList using addItems().
I think this should be an easy solution to what you are asking for.
void MyClass::Set_List(QList<QString> filesList, int item_count)
{
QVector<QString> load_set(item_count);
for(int i = 0; i < item_count; i++)
{
load_set[i] = filesList[i];
ui -> listWidget -> addItem(load_set[i]);
}
}
Then to get the info back out...
void MyClass::Selection(QListWidgestItem * item)
{
for(int i = 0; i < item_count; i++)
{
if(ui -> listWidget -> item(i) == item)
{
str = ui -> listWidget -> item(i) -> text();
}
}
}
Related
just want to put it out there that I am a beginner at C++. I'm trying get all the elements in my QListView and insert them into a Vector.
This is my loaddataset function which loads the files from a folder into the QListView:
void MainWindow::on_actionLoad_Dataset_triggered()
{
QString sPath = QFileDialog::getExistingDirectory(this, tr("Choose catalog"), ".", QFileDialog::ReadOnly);
QStringList filter;
filter << QLatin1String("*.png");
filter << QLatin1String("*.jpeg");
filter << QLatin1String("*.jpg");
filter << QLatin1String("*.gif");
filter << QLatin1String("*.raw");
filemodel -> setNameFilters(filter);
ui -> imgList -> setRootIndex(filemodel -> setRootPath(sPath));
}
This is my QList function which then takes the file that the user clicks on and loads it onto a PixMap:
void MainWindow::on_imgList_clicked(const QModelIndex &index)
{
imgNames = {};
QString sPath = filemodel -> fileInfo(index).path();
QString paths = filemodel -> fileInfo(index).fileName();
//this kind of does it but instead of pushing them all it only pushes the ones that the user has clicked on instead of all
imgNames.push_back(paths);
map -> filename = filemodel -> filePath(index);
map -> loadImage(scene);
scene -> addItem(map);
}
If your question is how to initialize a QStringList, with C++11 you can use an initializer list:
const auto filter = QStringList{
QLatin1String("*.png"),
QLatin1String("*.jpeg"),
QLatin1String("*.jpg"),
QLatin1String("*.gif"),
QLatin1String("*.raw") };
filemodel -> setNameFilters( filter );
If fact, you can drop the explicit instance of QStringList and shorten it to:
filemodel -> setNameFilters( {
QLatin1String("*.png"),
QLatin1String("*.jpeg"),
QLatin1String("*.jpg"),
QLatin1String("*.gif"),
QLatin1String("*.raw") } );
If you're forcing all strings to be translated / Unicode-friendly except those explicitly opted out of (the usual use case for QLatin1String), you might also consider defining your own string literal operator to make it more concise:
inline QLatin1String operator""_QL1( const char* str, std::size_t len )
{ return QLatin1String( str, len ); }
...
filemodel -> setNameFilters( { "*.png"_QL1, "*.jpeg"_QL1, "*.jpg"_QL1,
"*.gif"_QL1, "*.raw"_QL1 } );
You can get the list of all items from QListView like this:
auto* m = qobject_cast<QStringListModel*>(ui->listView->model());
const QStringList &list = m->stringList();
QVector<QString> vec;
std::vector<QString> vec2;
for (const auto& l : list) {
//using QVector
vec.append(l);
//or std::vector
vec2.push_back(l);
qDebug() << l;
}
As a side note, you can initialize your QStringList using initializer list like this:
QStringList list = {"item1", "item2", "item3"};
which will be faster and is much cleaner.
Im trying to make the code which reads xml files and deserialize various qt controls from this xml, and im doing this using QDomDocument, and i want to get the QLlist from my deserealization method. And im having a bit of troubles, here is some code of the template class (.h) file:
QList<T*> deserialize(QIODevice *input)
{
QList<T*> objects = QList<T*>();
if(_deserializeObject(input, objects))
return objects;
}
bool _deserializeObjects(QIODevice* input, QList<QObject*>& list);
and my .cpp file with deserialize method, here im reading the control tags from file:
bool Serializer::_deserializeObjects(QIODevice* input, QList<QObject *> &objects)
{
QDomDocument doc;
if (!doc.setContent(input))
return false;
QDomElement root= doc.documentElement();
for(int j = 0; j < root.childNodes().length();j++)
{
QObject* object;
qDebug() << root.tagName();
if(root.tagName().contains("QGroupBox")) // <------- Here i need to determine which control i need to process.
{
????
}
qDebug () << object->metaObject()->className();
qDebug() << object->metaObject()->propertyCount();
for(int i = 0; i < object->metaObject()->propertyCount(); i++)
{
object->metaObject()->cast()
QMetaProperty prop = object->metaObject()->property(i);
QString propName = prop.name();
if(propName == "objectName")
continue;
QDomNodeList nodeList = root.elementsByTagName(propName);
if(nodeList.length() < 1)
continue;
QDomNode node = nodeList.at(0);
QVariant value = object->property(propName.toLatin1().data());
QString v = node.toElement().text();
if(propName == "x")
{
x = v.toInt();
}
else if(propName == "y")
{
y = v.toInt();
}
else if(propName == "width")
{
width = v.toInt();
}
else if(propName == "height")
{
height = v.toInt();
}
if(propName == "geometry")
{
continue;
}
object->setProperty(propName.toLatin1().data(), QVariant(v));
}
object->setProperty("geometry",QVariant(QRect(x,y,width,height)));
objects.push_back(object);
}
return true;
}
In this part
if(root.tagName().contains("QGroupBox")) // <------- Here i need to determine which control i need to process.
{
????
}
qDebug () << object->metaObject()->className();
qDebug() << object->metaObject()->propertyCount();
for(int i = 0; i < object->metaObject()->propertyCount(); i++)
{
...
}
I want to actually somehow get the type of the control by name, so the question is, can i cast QGroupBox to QObject saving the QGroupBox properties so QObject metaObject class name would be QGroupBox, so i can pass all this properties? Because i don't want to make the loops for each control type. Also i when i got the result like so:
QList<QObject *> ds = s.deserialize<Object>((QIODevice*)&f);
Can i then just pass all QObjects in a loop and using QMetaObject class name and using qobject_cast cast each object to QPushButton,QLabel etc.?
QGroupBox is a subclass of QObject; therefore every QGroupBox is also a QObject, so you can treat it as one whenever you like. An explicit cast isn't necessary.
Iterating over all the diffent objects-derived-from-QObject in a loop will do what you want, provided that the methods you call on them are virtual methods (which they presumably will be -- in particular, QObject::metaObject() is a virtual method, so your loop will get the appropriate QMetaObject returned even if it is calling them method through a QObject pointer).
(As an aside, the annoying part of the process will probably be the part where you have read the name of the object's type from the XML and now need to instantiate an object of that type. AFAIK there is no good automatic way to do that in C++, so the best you can do is a factory function containing a giant switch statement with a separate case for every type you might want to instantiate)
Alternatively, use a right tool for a right job. Chances are that what you are really building here is some XML thing for defining widget layouts etc. Qt already has a tool for that, the Qt Designer which uses an XML format for the UI definitions and a C++ code generator for actually producing a C++ code during compile time.
I can't find a way to cast a QList of QObjects to another QList with another class template. I have a function that creates instances of QObjects and then return a QList. So my question is, can I cast that QList to another QList of different template class pointers ?
My code:
QList<QObject *> DbManager::listVO(QString voname)
{
DbManager::VOPropertiesJoin(DbManager::VOKeys(obj),VOJOIN_BOTH,"=");
QList<QObject *> vos;
QString voquery = "select * from %1";
voquery = voquery.arg(voname);
QSqlQueryModel *volist = DbManager::makeSelect(voquery);
for(int i = 0;i < volist->rowCount();i++){
QSqlRecord record =volist->record(i);
QObject *voinstance = DbManager::instantiateVO(voname,record.value(0),record.value(1),record.value(2),record.value(3),record.value(4),record.value(5),record.value(6),record.value(7));
vos << voinstance;
}
return vos;
}
and I want something like this:
QList<AnyClass*> list = DbManager::listVO("AnyClass");
Thanks for help in advance.
Since what you need at the end is a QList<AnyClass*>, you can try something like this (Assuming AnyClass is derived from QObject)
Note: I did some modifications to your original code to pass your list by reference since returning a huge list might not that be efficient. I didn't compile the code, but hoping you can figure out what is happening inside this snippet
void DbManager::listVO(QString voname, QList<AnyClass*>& listAnyClass)
{
DbManager::VOPropertiesJoin(DbManager::VOKeys(obj),VOJOIN_BOTH,"=");
// Initialise list with an empty list
listAnyClass = QList<AnyClass*>();
QString voquery = "select * from %1";
voquery = voquery.arg(voname);
QSqlQueryModel *volist = DbManager::makeSelect(voquery);
for(int i = 0; i < volist->rowCount(); i++)
{
QObject *voinstance = GetInstance(voname, volist->record(i));
// Trying to cast into an AnyClass
AnyClass* pAnyClass = qobject_cast<AnyClass*>(voinstance);
// If pAnyClass is a valid AnyClass* update your list
if(pAnyClass)
{
listAnyClass.append(pAnyClass);
}
}
}
QObject* DbManager::GetInstance(QString sVoname, const QSqlRecord& record)
{
return DbManager::instantiateVO
(
voname,
record.value(0),
record.value(1),
record.value(2),
record.value(3),
record.value(4),
record.value(5),
record.value(6),
record.value(7)
)
}
And after calling DbManager::listVO(QString voname, QList<AnyClass*>& listAnyClass) function, listAnyClass will get populated accordingly. This is efficient with contrast to returning a list.
Edited:
So in a nutshell you want to convert a QList<QObject*> into QList<AnyClass*>. So keep your original code as it is and implement a method like this where you wanna
do this conversion:
void ConvertToAnyClassList(const QList<QObject*>& listQObjects, QList<AnyClass*>& listAnyClass)
{
listAnyClass = QList<AnyClass*>();
for( int i = 0; i < listQObjects.length(); ++i )
{
AnyClass* pAnyClass = qobject_cast<AnyClass*>(listQObjects.at(i));
if(pAnyClass)
{
listAnyClass.append(pAnyClass)
}
}
}
And you can call it like this:
QList<QObject*> listQObjects = DbManager::listVO("AnyClass");
QList<AnyClass*> listAnyClass;
ConvertToAnyClassList(listQObjects,listAnyClass);
Suppose you have multiple types, so you may want to implement functions for each type like this:
ConvertToUserList(listQObjects,listUserObjects);
ConvertToCountryList(listQObjects,listCountryObjects);
I need my QT application to create a table and copy this table into the clipboard, so that it can be pasted as table into libreoffice Writer or MS Word later.
My first approach was to create html code for the table and insert it into the clipboard with
QClipboard *clipboard = QApplication::clipboard();
QMimeData *mimeData = new QMimeData();
mimeData->setData("text/html", html.toUtf8());
clipboard->setMimeData(mimeData, QClipboard::Clipboard);
This approach didn't work. When pasting, the table cells where just appended to each other and inserted without formatting.
My second approach using RTF:
QTextDocument rtfDocument;
rtfDocument.setHtml(html);
But I found no way to copy this QTextDocument into the clipboard. Is there any?
If I could get the RTF code out of the QTextDocument, I could use a way like
QClipboard *clipboard = QApplication::clipboard();
QMimeData *mimeData = new QMimeData();
mimeData->setData("text/rtf", rtfDocument.getCode());
clipboard->setMimeData(mimeData, QClipboard::Clipboard);
But I also didn't find a function returning the rtf code.
edit:
With the last code box above I have a working way to copy rtf code into the clipboard. So any solution that can create RTF code representing a table would solve my problem.
I'm not sure what the source of your data is, but here is code we used to subclass the normal QTableView to make it copy-able. Some of the code has been cut out, but you can get the basic idea. RTF/HTML is overkill--all the spreadsheets accept good ol' CSV.
Of course, this answer won't help at all if you require formatting. I wasn't clear from your question if that was a requirement or not.
// Escapes a string according to RFC-4180 specification.
static QString csvEscape(const QString &value) {
if (value.contains(QRegExp(QLatin1String("[\"\\n\\r,]")))) {
QString escaped(value);
escaped.replace(QLatin1String("\""), QLatin1String("\"\""));
return QString::fromLatin1("\"%1\"").arg(escaped);
} else {
return value;
}
}
void ClipboardAwareTableView::Copy() const {
QModelIndexList indexes = selectedIndexes();
Q_ASSERT(!indexes.isEmpty());
if(indexes.isEmpty()) {
return;
}
// The default sort is by rows then columns. This is what we want.
qSort(indexes);
// Remember the mapping between model columns and visible columns. This is
// local instead of an instance member because it would need to be invalidated
// any time a column is added, removed, or moved. The minor performance hit
// is worth the simplicity.
QHash<int, int> map_cache;
// Before we start exporting text, we have to know the index of the left-
// most column in our selection range so we can add the appropriate number
// of column separators.
int minimum_column = GetViewColumnIndex(indexes.first().column(), &map_cache);
for (int i = 1; i < indexes.size(); ++i) {
minimum_column =
qMin(minimum_column,
GetViewColumnIndex(indexes.at(i).column(), &map_cache));
}
// Keep track of the previous index so that we know if we need a new line and
// how many column separators to insert. We start with an invalid index.
QModelIndex previous;
QString text;
for (int i = 0; i < indexes.size(); ++i) {
QModelIndex current = indexes.at(i);
// Do we need to add a new line character?
if (previous.isValid() && current.row() != previous.row()) {
text.append(QLatin1String("\n"));
}
// Are we on a new line?
if (!previous.isValid() || current.row() != previous.row()) {
// Add enough separators to get from the minimum to the current column.
text.append(QString::fromLatin1(",")
.repeated(GetViewColumnIndex(current.column(), &map_cache) -
minimum_column));
} else {
// Add enough separators to get from the previous to the current column.
text.append(QString::fromLatin1(",")
.repeated(GetViewColumnIndex(current.column(), &map_cache) -
GetViewColumnIndex(previous.column(), &map_cache)));
}
// Append the text. If the column delegate is a QStyledItemDelegate, we use
// the display text.
QStyledItemDelegate *delegate =
qobject_cast<QStyledItemDelegate*>(
itemDelegateForColumn(current.column()));
if (delegate) {
text.append(csvEscape(delegate->displayText(current.data(), QLocale())));
} else {
text.append(csvEscape(current.data().toString()));
}
previous = current;
}
qApp->clipboard()->setText(text);
}
int ClipboardAwareTableView::GetViewColumnIndex(
int model_column_index,
QHash<int, int> *cached_mappings) const {
if (cached_mappings->contains(model_column_index)) {
return cached_mappings->value(model_column_index);
}
int view_index = 0;
for (int i = 0; i < model()->columnCount(); ++i) {
if (model_column_index == i) {
cached_mappings->insert(model_column_index, view_index);
return view_index;
} else if (!isColumnHidden(i)) {
++view_index;
}
}
throw std::invalid_argument("model_column_index was out of range.");
}
void ClipboardAwareTableView::keyPressEvent(QKeyEvent *event) {
if (event->matches(QKeySequence::Copy) && !selectedIndexes().isEmpty()) {
Copy();
event->accept();
return; // The base class implementation will overwrite the clipboard.
}
event->ignore();
QTableView::keyPressEvent(event);
}
You could try using QTextDocument::toHtml() and set the mime type to text/html
I wrote in gedit 1[tab space]2[tab space]3\n4[tab space]5[tab space]6 and copied it to spreadsheet and it worked. So, I think if you use "\t" for separating cells in rows and "\n" for separating rows, it will work.
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.
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.
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
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!
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
What you'll need to do is access the text data in the model, then pass that text to the QClipboard.
To access the text data in the model, use QModelIndex::data(). The default argument is Qt::DisplayRole, i.e. the displayed text.
Once you've retrieved the text, pass that text to the clipboard using QClipboard::setText().
a pyqt py2.x example:
selection = self.table.selectionModel() #self.table = QAbstractItemView
indexes = selection.selectedIndexes()
columns = indexes[-1].column() - indexes[0].column() + 1
rows = len(indexes) / columns
textTable = [[""] * columns for i in xrange(rows)]
for i, index in enumerate(indexes):
textTable[i % rows][i / rows] = unicode(self.model.data(index).toString()) #self.model = QAbstractItemModel
return "\n".join(("\t".join(i) for i in textTable))
I finally got it, thanks.
void Widget::copy() {
QItemSelectionModel *selectionM = tableView->selectionModel();
QModelIndexList selectionL = selectionM->selectedIndexes();
selectionL.takeFirst(); // ID, not necessary
QString *selectionS = new QString(model->data(selectionL.takeFirst()).toString());
selectionS->append(", ");
selectionS->append(model->data(selectionL.takeFirst()).toString());
selectionS->append(", ");
selectionS->append(model->data(selectionL.takeFirst()).toString());
selectionS->append(", ");
selectionS->append(model->data(selectionL.takeFirst()).toString());
clipboard->setText(*selectionS);
}
and
connect (tableView, SIGNAL(clicked(QModelIndex)), this, SLOT(copy()));
I can't help but notice that you can simplify your code using a foreach() construct and the QStringList class, which has a convenient join() function.
void Widget::copy()
{
QStringList list ;
foreach ( const QModelIndex& index, tableView->selectedIndexes() )
{
list << index.data() ;
}
clipboard->setText( list.join( ", " ) ) ;
}
Careful with the last element. Note below, indexes may become empty after 'removeFirst()'. Thus, 'current' is never valid and should not be used in model()->data(current).
indexes.removeFirst();
QString selected_text;
QModelIndex current;
Q_FOREACH(current, indexes)
{
.
.
.
}
// add last element
selected_text.append(model()->data(current).toString());
Consider
QModelIndex last = indexes.last();
indexes.removeFirst();
QString selected_text;
Q_FOREACH(QModelIndex current, indexes)
{
.
.
.
}
// add last element
selected_text.append(model()->data(last).toString());
Here is a variation on what Corwin Joy posted that works with QTableView and handles sparse selections differently. With this code if you have different columns selected in different rows (e.g. selected cells are (1,1), (1, 2), (2, 1), (3,2)) then when you paste it you will get empty cells corresponding to the "holes" in your selection (e.g. cells (2,2) and (3,1)). It also pulls in the column header text for columns that intersect the selection.
void CopyableTableView::copy()
{
QItemSelectionModel *selection = selectionModel();
QModelIndexList indices = selection->selectedIndexes();
if(indices.isEmpty())
return;
QMap<int, bool> selectedColumnsMap;
foreach (QModelIndex current, indices) {
selectedColumnsMap[current.column()] = true;
}
QList<int> selectedColumns = selectedColumnsMap.uniqueKeys();
int minCol = selectedColumns.first();
// prepend headers for selected columns
QString selectedText;
foreach (int column, selectedColumns) {
selectedText += model()->headerData(column, Qt::Horizontal, Qt::DisplayRole).toString();
if (column != selectedColumns.last())
selectedText += QLatin1Char('\t');
}
selectedText += QLatin1Char('\n');
// QModelIndex::operator < sorts first by row, then by column.
// this is what we need
qSort(indices);
int lastRow = indices.first().row();
int lastColumn = minCol;
foreach (QModelIndex current, indices) {
if (current.row() != lastRow) {
selectedText += QLatin1Char('\n');
lastColumn = minCol;
lastRow = current.row();
}
if (current.column() != lastColumn) {
for (int i = 0; i < current.column() - lastColumn; ++i)
selectedText += QLatin1Char('\t');
lastColumn = current.column();
}
selectedText += model()->data(current).toString();
}
selectedText += QLatin1Char('\n');
QApplication::clipboard()->setText(selectedText);
}
If anybody is interested, this web page provide a working code project on this topic, it's working pretty well.
Copy / paste functionality implementation for QAbstractTableModel / QTableView