I have QTreeView and I setSortEnable = true for it, and all of column show sort indicator, but now I want last column do not show sort indicator, just last column.
Have any idea or solution for my issue..:(
please help
Thanks
QHeaderView always draws the sorting indicator on a column when data is sorted by this column (if setSortIndicatorShown is true).
That is why it look like the only way to prohibit drawing of the indicator is to prohibit sorting of the column by left-click.
To prohibit sorting by a certain column you need:
1. create a new class inherited from QHeaderView (or use an event filter)
2. reimplement mouseReleaseEvent and mousePressEvent
3. use logicalIndexAt to indicate that user clicked on the column
4. call setSectionsClickable(false) before calling the base method and setSectionsClickable(true) after it.
Example:
void HeaderView::mouseReleaseEvent(QMouseEvent* e)
{
const int index = logicalIndexAt(e->pos());
if (index == 3) setSectionsClickable(false);
QHeaderView::mouseReleaseEvent(e);
setSectionsClickable(true);
}
Do the same for mousePressEvent.
thus you will prohibit sorting of a certain column
In my case, I've three columns and it was necessary to hide the sort indicator of the second column.
Because of I had custom rules of sorting, just got QHeaderView::sectionClicked event with OnHeaderClicked(int column) slot, and did this:
switch (column)
{
case 0:
// Custom sorting operations
break;
case 1:
tree_widget_->sortByColumn(-1);
break;
case 2:
// Custom sorting operations
break;
}
Related
I have a QTableWidget and an object of class product called p.
I wanna add items to this table.
I tried the code below but no use.
void MainWindow:: add_to_basket (product p){
ui->tableWidget->insertRow(1);
QLineEdit *qle=new QLineEdit();
qle->setText(p.get_name());
ui->tableWidget->setCellWidget(1,1,qle);
QLineEdit *qle1=new QLineEdit();
qle1->setText(QString::number(p.get_price()));
ui->tableWidget->setCellWidget(1,2,qle1);
QSpinBox *qsb=new QSpinBox();
qsb->setValue(p.get_count());
ui->tableWidget->setCellWidget(1,3,qsb);
}
what should I do?
QTableWidget should have defined rowCount and columnCount properties. It can be done either via QTableWidget constructor (https://doc.qt.io/qt-5/qtablewidget.html#QTableWidget-1) or via appropriate methods (setRowCounts and setColumnCounts). If it is done already, that's great.
insertRow inserts an empty row into the table at given position. ui->tableWidget->insertRow(1) would insert a new row at position 1 only if you have previously defined rowCount and columnCount (see point 1).
It depends what is your idea here - if you would like to have at least 4 columns (please note that we are counting from 0 and the QSpinBox is attempted to be put into third column) and insert new product always at first row, your code with point 1 fullfilled will be work fine. But, if your idea is to add a new row each time new product is added, you should rather call ui->tableWidget->insertRow(tableWidget->rowCount()) and use that value to address appropriate row.
You may also want to have a look here for example how to setup QTableWidget: https://wiki.qt.io/How_to_Use_QTableWidget
I have a qtablewidget with some rows. I need to sort these row randomly.
What is the best way to do this ? I have no idea except remove and add all row randomly ...
"I assume you are looking for some custom sort. Not column header click sort"
I have a way to do it. may be much more efficient way will be there.
get the "QList" of "QTableWidgetItem" using below function.
QList<QTableWidgetItem *> findItems(const QString & text, Qt::MatchFlags flags) const
Then sort your list as shown below with your condiion
bool sortFun(const QTableWidgetItem* v1, const QTableWidgetItem* v2)
{
return //your sor criteria;
}
int doComparison()
{
QList<QTableWidgetItem *> fieldsList;
// Add items to fieldsList.
qSort(fieldsList.begin(), fieldsList.end(), sortFun);
}
Not clear your "QTableWidget".
Then re assign your sorted list of "QTableWidgetItems" to QTableWidget
Finally I have done something different.
What I need to do:
- random the rows of my table
- I have a column with a "Time" and I initialize it with 15:00 for the first row and then add 1 minute for each row.
The solution I used:
- create a qlist with my times (15:00, 15:01, 15:02 ...)
- randomize the qlist (15:01, 15:03, ....)
- assign the qlist's items to the column "Time" of my table
- order my table with the column "Time" with the sort column method.
It is a standard QTableWidget
All cells are QTableWidgetItem.
All cells are editable/selectable
Question: How can I modify all the cells I have selected?
Possible way is to use the dialog open. So the idea is like this :
Select the items
Make a button or something to open input dialog.
Apply the value of input dialog to all selected items.
I was facing a similar problem a couple years ago and I solved it like this:
I have inherited my own view and I have reimplemented methods commitData() and mouseReleaseEvent().
commitData takes all selected indices from the selection model and calls QAbstractItemModel::setData() for all of them. Data are taken from the editor like this:
QByteArray n = editor->metaObject()->userProperty().name();
if (n.isEmpty())
n = delegate->itemEditorFactory()->valuePropertyName(model()->data(index, Qt::EditRole).userType());
if (!n.isEmpty())
{
QVariant data = editor->property(n);
for (const QModelIndex & idx : selectedIndices)
{
model()->setData(idx, data);
}
}
mouseReleaseEvent() performs three steps:
Get a current selection from the selection model.
Call original event handler (QTableWidget::mouseReleaseEvent())
Restore selection: QItemSelectionModel::select()
I'm creating a table that displays information from a MySQL database, I'm using foreignkeys all over the place to cross-reference data.
Basically I have a datagrid with a column named 'system.' The system is an int that represents the id of an object in another table. I've used lableFunction to cross-reference the two and rename the column. But now sorting doesn't work, I understand that you have to create a custom sorting function. I have tried cross-referencing the two tables again, but that takes ~30sec to sort 1200 rows. Now I'm just clueless as to what I should try next.
Is there any way to access the columns field label inside the sort function?
public function order(a:Object,b:Object):int
{
var v1:String = a.sys;
var v2:String = b.sys;
if ( v1 < v2 ){
trace(-1);
return -1;
}else if ( v1 > v2 ){
trace(1);
return 1;
}else {
trace(0);
return 0;
}
}
One way to handle this is to go through the objects you received and add the label as a property on each of them based on the cross-referenced id. Then you can specify your label property to display in your data grid column instead of using a label function. That way you would get sorting as you'd expect rather than having to create your own sort function.
The way that DataGrids, and other list based classes work is by using itemRenderers. Renderers are only created for the data that is shown on screen. In most cases there is a lot more data in your dataProvider than what is seen on screen.
Trying to sort your data based on something displayed by the dataGrid will most likely not give you the results you want.
But, there is no reason you can't call the same label function on your data objects in the sortFunction.
One way is to use the itemToLabel function of the dataGrid:
var v1:String = dataGrid.itemToLabel(a);
var v2:String = dataGrid.itemToLabel(b);
A second way is to just call the labelFunction explicitly:
var v1:String = labelFunction(a);
var v2:String = = labelFunction(b);
In my experience I have found sorting to be extremely quick, however you're recordset is slightly larger than what I usually load in memory at a single time.
I need to access columns of infragistics ultragrid in same sequence in which they are being displayed in grid. If i can get the index of column in same sequence as they are visible on grid, i can fix my issues.
Thanks in advance.
Lalit
UltraGridColumn column = this.ultraGrid1.DisplayLayout.Bands[0].Columns[0];
Debug.WriteLine( "Columns in visible order: ");
// Get the first visible column by passing in VisibleRelation.First.
column = column.GetRelatedVisibleColumn( VisibleRelation.First );
while ( null != column )
{
Debug.WriteLine( " " + column.Key );
// Get the next visible column by passing in VisibleRelation.Next.
column = column.GetRelatedVisibleColumn( VisibleRelation.Next );
}
http://help.infragistics.com/Help/NetAdvantage/NET/2008.2/CLR2.0/html/Infragistics2.Win.UltraWinGrid.v8.2~Infragistics.Win.UltraWinGrid.UltraGridColumn~GetRelatedVisibleColumn.html
I suppose you could try to handle the event that is fired when the order is changed and keep track of all the changes, but this seems like it is asking for subtle bugs to creep in.
I considered looping through all the columns and trying to use some property that would tell me their current position (maybe the TabOrder?) and use that to compile an inorder list of the columns. I guess you might have to loop through each colum using the Column.GetRelatedVisibleColumn() method.
I have not actually implemented it yet as I have other higher priority issues but that may be the road I end up going down.
This is an old question, but I recently had same issue and solved it this way:
var selectedCells = this.Selected.Cells;
List<int> columns = new List<int>();
foreach (var cell in selectedCells)
{
if (!columns.Contains(cell.Column.Index))
columns.Add(cell.Column.Index);
}
columns.Sort((x, y) => this.DisplayLayout.Rows.Band.Columns[x].Header.VisiblePosition.CompareTo(this.DisplayLayout.Rows.Band.Columns[y].Header.VisiblePosition));
You can then use columns to access columns in order they are shown.