How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.
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Hi, I have done this, still not able to make check boxes work and not able to make checkboxes at the root only.
DomItem.cpp #include "DOMItem.h" #include<QCheckBox> #include <QtXml> //! [0] DomItem::DomItem(const QDomNode &node, int row, DomItem *parent) : domNode(node), //! [0] // Record the item's location within its parent. //! [1] parentItem(parent), rowNumber(row) {} //! [1] //! [2] DomItem::~DomItem() { qDeleteAll(childItems); } //! [2] //! [3] QDomNode DomItem::node() const { return domNode; } //! [3] //! [4] DomItem *DomItem::parent() { return parentItem; } //! [4] //! [5] DomItem *DomItem::child(int i) { DomItem *childItem = childItems.value(i); if (childItem) return childItem; // if child does not yet exist, create it if (i >= 0 && i < domNode.childNodes().count()) { QDomNode childNode = domNode.childNodes().item(i); childItem = new DomItem(childNode, i, this); childItems[i] = childItem; } return childItem; } //! [5] //! [6] int DomItem::row() const { return rowNumber; } //! [6] QVariant DomItem::data(int column) const { return itemData.value(column); }DomModel.cpp #include "DomModel.h" #include "DOMItem.h" //#include "mainwindow.h" #include <QtXml> #include<QCheckBox> //! [0] DomModel::DomModel(const QDomDocument &document, QObject *parent) : QAbstractItemModel(parent), domDocument(document), rootItem(new DomItem(domDocument, 0)) { } //! [0] //! [1] DomModel::~DomModel() { delete rootItem; } //! [1] //! [2] int DomModel::columnCount(const QModelIndex &parent) const { Q_UNUSED(parent); return 3; } //! [2] /*/! [3] QVariant DomModel::data(const QModelIndex &index, int role) const { if (!index.isValid()) return QVariant(); if (role != Qt::DisplayRole) return QVariant(); const DomItem *item = static_cast<DomItem*>(index.internalPointer()); const QDomNode node = item->node(); //! [3] //! [4] switch (index.column()) { case 0: return node.nodeName(); case 1: { const QDomNamedNodeMap attributeMap = node.attributes(); QStringList attributes; for (int i = 0; i < attributeMap.count(); ++i) { QDomNode attribute = attributeMap.item(i); attributes << attribute.nodeName() + "=\"" + attribute.nodeValue() + '"'; } return attributes.join(' '); } case 2: return node.nodeValue().split('\n').join(' '); default: break; } return QVariant(); } //! [4] */ QVariant DomModel::data(const QModelIndex &index, int role) const { if (!index.isValid()) return QVariant(); DomItem *item = static_cast<DomItem*>(index.internalPointer()); const QDomNode node = item->node(); if ( role == Qt::CheckStateRole && index.column() == 0 ) return static_cast< int >( item->isChecked() ? Qt::Checked : Qt::Unchecked ); if (role != Qt::DisplayRole) return QVariant(); switch (index.column()) { case 0: return node.nodeName(); case 1: { const QDomNamedNodeMap attributeMap = node.attributes(); QStringList attributes; for (int i = 0; i < attributeMap.count(); ++i) { QDomNode attribute = attributeMap.item(i); attributes << attribute.nodeName() + "=\"" + attribute.nodeValue() + '"'; } return attributes.join(' '); } case 2: return node.nodeValue().split('\n').join(' '); default: break; } return item->data(index.column()); } /* //! [5] Qt::ItemFlags DomModel::flags(const QModelIndex &index) const { if (!index.isValid()) return Qt::NoItemFlags; return QAbstractItemModel::flags(index); } //! [5] */ Qt::ItemFlags DomModel::flags(const QModelIndex &index) const { if (!index.isValid()) return Qt::NoItemFlags; Qt::ItemFlags flags = Qt::ItemIsEnabled | Qt::ItemIsSelectable; if ( index.column() == 0 ) flags |= Qt::ItemIsUserCheckable; return flags; } //! [6] QVariant DomModel::headerData(int section, Qt::Orientation orientation, int role) const { if (orientation == Qt::Horizontal && role == Qt::DisplayRole) { switch (section) { case 0: return tr("Name"); case 1: return tr("Attributes"); case 2: return tr("Value"); default: break; } } return QVariant(); } //! [6] //! [7] QModelIndex DomModel::index(int row, int column, const QModelIndex &parent) const { if (!hasIndex(row, column, parent)) return QModelIndex(); DomItem *parentItem; if (!parent.isValid()) parentItem = rootItem; else parentItem = static_cast<DomItem*>(parent.internalPointer()); //! [7] //! [8] DomItem *childItem = parentItem->child(row); if (childItem) return createIndex(row, column, childItem); return QModelIndex(); } //! [8] //! [9] QModelIndex DomModel::parent(const QModelIndex &child) const { if (!child.isValid()) return QModelIndex(); DomItem *childItem = static_cast<DomItem*>(child.internalPointer()); DomItem *parentItem = childItem->parent(); if (!parentItem || parentItem == rootItem) return QModelIndex(); return createIndex(parentItem->row(), 0, parentItem); } //! [9] //! [10] int DomModel::rowCount(const QModelIndex &parent) const { if (parent.column() > 0) return 0; DomItem *parentItem; if (!parent.isValid()) parentItem = rootItem; else parentItem = static_cast<DomItem*>(parent.internalPointer()); return parentItem->node().childNodes().count(); } //! [10]mainwindow.cpp #include "mainwindow.h" #include "ui_mainwindow.h" #include "DomModel.h" #include <QDomDocument> #include <QTreeView> #include <QMenuBar> #include <QFileDialog> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), model(new DomModel(QDomDocument(), this)), view(new QTreeView(this)) { fileMenu = menuBar()->addMenu(tr("&File")); fileMenu->addAction(tr("&Open..."), this, &MainWindow::openFile, QKeySequence::Open); fileMenu->addAction(tr("E&xit"), this, &QWidget::close, QKeySequence::Quit); view->setModel(model); setCentralWidget(view); setWindowTitle(tr("QTreeViewXML")); setWindowIcon(QIcon("C:\\Users\arpit.k\\Documents\\QT\\build-QTreeViewXML-Desktop_Qt_6_2_4_MinGW_64_bit-Debug\\Accordlogo.png")); } void MainWindow::openFile() { QString filePath = QFileDialog::getOpenFileName(this, tr("Open File"), xmlPath, tr("XML files (*.xml);;HTML files (*.html);;" "SVG files (*.svg);;User Interface files (*.ui)")); if (!filePath.isEmpty()) { QFile file(filePath); if (file.open(QIODevice::ReadOnly)) { QDomDocument document; if (document.setContent(&file)) { DomModel *newModel = new DomModel(document, this); view->setModel(newModel); delete model; model = newModel; xmlPath = filePath; } file.close(); } } }Please help!
wrote on 29 Nov 2022, 14:55 last edited by JonB@Aviral-0 said in How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.:
still not able to make check boxes work
What exactly does this mean? Do you get to see any checkboxes? You do but they are not checkable? Or what?
make checkboxes at the root only.
I do not see anything in your
data()method,CheckStateRolecase, which attempts to only return the checked state for the root item, rather than for all/any item. I suggested you look atQAbstractItemView::rootIndex(), but I don't see that or any equivalent code. -
@Aviral-0 said in How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.:
still not able to make check boxes work
What exactly does this mean? Do you get to see any checkboxes? You do but they are not checkable? Or what?
make checkboxes at the root only.
I do not see anything in your
data()method,CheckStateRolecase, which attempts to only return the checked state for the root item, rather than for all/any item. I suggested you look atQAbstractItemView::rootIndex(), but I don't see that or any equivalent code. -
wrote on 29 Nov 2022, 16:14 last edited by
@Aviral-0
YourDomModel::data()method has correct code to look atitem->isChecked()to see whether to show checked/unchecked. But I do not see anywhere in your code which sets anyDomItem(or itsQDomNodereturned bynode()) to record that it has been checked. You have to store that somewhere. And ifDomModel::data()looks atitem->isChecked()forCheckStateRoleI think I would expect you to have a correspondingsetData()with case forCheckStateRolewhich calls anitem->setChecked(). -
@Aviral-0
YourDomModel::data()method has correct code to look atitem->isChecked()to see whether to show checked/unchecked. But I do not see anywhere in your code which sets anyDomItem(or itsQDomNodereturned bynode()) to record that it has been checked. You have to store that somewhere. And ifDomModel::data()looks atitem->isChecked()forCheckStateRoleI think I would expect you to have a correspondingsetData()with case forCheckStateRolewhich calls anitem->setChecked().wrote on 29 Nov 2022, 16:38 last edited by@JonB Thankyou, using setData() method the items are now checkable.
Just one thing I am not understanding. you said about
QModelIndex QAbstractItemView::rootIndex() const
I am not able to understand how to use it and where to use it.
as on website its not indepth elaboration about it. -
@JonB Thankyou, using setData() method the items are now checkable.
Just one thing I am not understanding. you said about
QModelIndex QAbstractItemView::rootIndex() const
I am not able to understand how to use it and where to use it.
as on website its not indepth elaboration about it.wrote on 29 Nov 2022, 17:44 last edited by JonBQt::ItemFlags DomModel::flags(const QModelIndex &index) const { if ( index.column() == 0 ) flags |= Qt::ItemIsUserCheckable;You said, I believe, that you only want a checkbox if it is the root index. You want to know whether
indexis the root index here. I realize now that QModelIndex QAbstractItemView::rootIndex() const is a method of theQTreeViewand not available in model flags code. Is the root index row 0 in the model (I don't know)? So you would need maybe&& index.row() == 0? -
Qt::ItemFlags DomModel::flags(const QModelIndex &index) const { if ( index.column() == 0 ) flags |= Qt::ItemIsUserCheckable;You said, I believe, that you only want a checkbox if it is the root index. You want to know whether
indexis the root index here. I realize now that QModelIndex QAbstractItemView::rootIndex() const is a method of theQTreeViewand not available in model flags code. Is the root index row 0 in the model (I don't know)? So you would need maybe&& index.row() == 0? -
@JonB Using
&& index.row() == 0
also didn't worked. I think index contains the current item location in tree -
@Aviral-0
YourQTreeViewhas a root index, the one you want a checkbox against, right? How did that get set? You want to know that index in the model code so that you can check for it yourdata()code, right? -
@Aviral-0
YourQTreeViewhas a root index, the one you want a checkbox against, right? How did that get set? You want to know that index in the model code so that you can check for it yourdata()code, right?wrote on 29 Nov 2022, 18:25 last edited by@JonB Please have a look at it.
https://github.com/aviralarpit/QTDomDoc.git -
@JonB Please have a look at it.
https://github.com/aviralarpit/QTDomDoc.git -
@Aviral-0
class DomModelhasQModelIndex rootIndex() const;(though can't see an implementation?) orDomItem *rootItemyou can use to identify the root item. -
@JonB I tried to use rootIndex() function but didn't understood how to.
Its just declaration. -
@Aviral-0
class DomModelhasQModelIndex rootIndex() const;(though can't see an implementation?) orDomItem *rootItemyou can use to identify the root item. -
@JonB I know its alot to ask, but can you tell me what change should I do specifically to make it work. It will be so nice of you taking your time to help me. Thankyou Brother.
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@Aviral-0
I'm not your Brother!I think you want in
flags():DomItem *item = static_cast<DomItem*>(index.internalPointer()); if (item == rootItem) flags |= Qt::ItemIsUserCheckable;to make it so only the root item is checkable.
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@Aviral-0
I'm not your Brother!I think you want in
flags():DomItem *item = static_cast<DomItem*>(index.internalPointer()); if (item == rootItem) flags |= Qt::ItemIsUserCheckable;to make it so only the root item is checkable.
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@Aviral-0
I'm not your Brother!I think you want in
flags():DomItem *item = static_cast<DomItem*>(index.internalPointer()); if (item == rootItem) flags |= Qt::ItemIsUserCheckable;to make it so only the root item is checkable.
wrote on 30 Nov 2022, 05:25 last edited by@JonB Hi Jon, just one more thing needed.
I want to Highlight the items of tree which is selected, like when we do multiple selection using CTRL button, the selected lines should be in blue highlight or their fonts can done Bold to make selected Items looks different.
How should I do it? any idea ? -
@JonB I have solved this.
By using
DomModel::data(){
if ( role == Qt::CheckStateRole && !index.parent().isValid())
}wrote on 30 Nov 2022, 08:38 last edited by@Aviral-0 said in How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.:
&& !index.parent().isValid()Ah, well done! I kind of thought that was for a child of the root element, and the root element was that parent. But I think it makes sense, I haven't actually ever used
QTreeViewI don't think.Do you mean you only want to alter presentation when multiple items are selected, not just a single one? Normally you would do colour/font via stylesheet on selected items. But that won't distinguish multiple versus single selection.
QTreeView::selectionModel/selectedIndexes()gives you which items/indexes are selected, that's all I know, somehow work from there? -
@Aviral-0 said in How to Insert checkbox in root of Qtreeview. Treeview is created by using QDOMDocument reading XML file.:
&& !index.parent().isValid()Ah, well done! I kind of thought that was for a child of the root element, and the root element was that parent. But I think it makes sense, I haven't actually ever used
QTreeViewI don't think.Do you mean you only want to alter presentation when multiple items are selected, not just a single one? Normally you would do colour/font via stylesheet on selected items. But that won't distinguish multiple versus single selection.
QTreeView::selectionModel/selectedIndexes()gives you which items/indexes are selected, that's all I know, somehow work from there?wrote on 30 Nov 2022, 09:14 last edited by@JonB I am trying this piece of code:
const bool shouldBeBold = (index.column() == 0);
if (role == Qt::FontRole && shouldBeBold) {
QFont boldFont;
boldFont.setBold(true);
return boldFont;
} else {
return DomModel::data(index, role);
}you repied to this code in past at someone elses pproblem.
but its not working -
@JonB I am trying this piece of code:
const bool shouldBeBold = (index.column() == 0);
if (role == Qt::FontRole && shouldBeBold) {
QFont boldFont;
boldFont.setBold(true);
return boldFont;
} else {
return DomModel::data(index, role);
}you repied to this code in past at someone elses pproblem.
but its not workingwrote on 30 Nov 2022, 09:23 last edited by@Aviral-0
Debugging techniques:- Put a
qDebug()into yourifstatement, does it get hit at all? - Set
shouldBeBold = trueunconditionally, does any items come up in bold? - Try, say,
role == Qt::ForegroundRoleandreturn QColor(Qt::red), does that work in case it's some bold issue? - If you are doing this on selected items it might be that selection sets font instead, I don't know.
- Put a
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