Consider there is a QTablWidget and a QTextEdit. Both of them are in a horisontal QSplitte. Let the QTable widget has 2 columns.
The problem is to resize the table columns' width as you do resize operation by moving the splitter with mouse. Are there any options to may colums to be resized synchornosly with the table?
Thanks.
QHeaderView *header = ui->tableWidget->horizontalHeader();
header->setResizeMode(QHeaderView::Stretch);
This code sets all columns of ui->tableWidget to equal width and let it change automatically.
And take a look on QHeaderView description in docs, you can do almost anything you can imagine with table columns with this API.
Sad, but you can't set any stretch factor or smth., if you need relational column widths not to be equal, but you still can reimplement sizeHint() or resize sections when header's geometriesChanged fires.
Related
I would like to do what I can only describe as "selection-border-radius" would intuitively do for QTableView rows.
I am using QCustomPlot to plot a bar graph. There are two such bar graphs horizontally arranged inside a QSplitter (which can be dragged). On dragging the splitter horizontally, the bar graphs resize and scale to the point that the axes labels start to overlap. I have a parent QWidget which contains a QScrollArea which ultimately contains the plot. This widget is added to the QSplitter.
QWidget* topLeftParent = new QWidget;
topLeftParent->setLayout(new QVBoxLayout);
QScrollArea *topLeftScrollArea = new QScrollArea(this);
topLeftScrollArea->setWidget(energyGraph->GetPlot());
topLeftScrollArea->setWidgetResizable(true);
topLeftScrollArea->setFrameShape(QFrame::NoFrame);
topLeftParent->layout()->addWidget(topLeftScrollArea);
m_pTopLeftHorizontalSplitter->setMinimumWidth(500);
m_pTopLeftHorizontalSplitter->addWidget(topLeftParent);
Existing Behaviour:
On dragging the splitter horizontally, the bar graphs expand/shrink horizontally till the axes tick labels overlap and ultimately at a very small value of width, the horizontal scrollbar appears, which is useless. Same is the case for resizing the window as well.
Required Behavior
However, I seek a different behavior. I want the bar graphs to be horizontally scrollable without them resizing on dragging the splitter i.e. dragging the splitter left/right should reveal more/less of the graphs, and not resize them
Queries
How do I specify that the bar graph should have a minimum size and expand from that depending on the number of ticks on x-axis?
How do I stop the plot from automatically expanding/shrinking?
What I have tried so far
I have tried setting minimum size for the plot, but it does not work.
I have also tried specifying the stretch factor for the splitter to 0, but that also has no effect i.e. the behavior is auto resizing bar graphs in both the cases with scrollbar appearing too late.
To achieve the required behavior you can use the QTableWidget widget. You need to:
Create a QTableWidget widget with two columns and and one row.
Set the QScrollArea widget as the parent of the QTableWidget widget.
Hide the horizontal and vertical headers. To do so set horizontalHeaderVisible and verticalHeaderVisible to false.
Add QCustomPlot widgets into the table using the setCellWidget(int row, int column, QWidget * widget) method.
This is how it was solved: I just had to call the setWidgetResizable with false for the scroll area and now I have a permanent scrollbar and the custom plot does not resize while dragging the splitter.
Find if you have this line:
ui->my_plot->setInteractions(QCP::iRangeZoom | QCP::iRangeDrag);
And edit it to whatever you want, for example just range zoom:
ui->my_plot->setInteractions(QCP::iRangeZoom);
I have made a window in Qt C++ where inside I fill a table with items row by row. However, after I fill out enough rows, a scrollbar appears in order to allow me to scroll the extra rows. The problem is - when the scrollbar appears, it squeezes the table inwards. Is there some way to prevent this from happening?
I am new to Qt and I have just managed to make a QTableView work with my model. It has fixed 3 columns. When I open a window, it look ok but when i resize the window, the QTableView itself gets resized but columns' width remains the same. Is there any build-in way to make it work? I want columns to resize to fit the edges of QTableView every the the window gets resized.
This code equally stretches each column so that they fit the table's width.
table->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
Docs:
QHeaderView::setSectionResizeMode
See resize modes here.
There is a header flag to ensure that the QTableView's last column fills up its parent if resized. You can set it like so:
table_view->horizontalHeader()->setStretchLastSection(true);
However, that does not resize the other columns proportionately. If you want to do that as well, you could handle it inside the resizeEvent of your parent thusly:
void QParent::resizeEvent(QResizeEvent *event) {
table_view->setColumnWidth(0, this->width()/3);
table_view->setColumnWidth(1, this->width()/3);
table_view->setColumnWidth(2, this->width()/3);
QMainWindow::resizeEvent(event);
}
QParent class is subclass of QMainWindow.
Widgets QTableView, QTreeView and their derived classes (such as QTableWidget) have this two usefull methods:
QHeaderView* horizontalHeader() const;
QHeaderView* verticalHeader() const;
If you open documentation for a class QHeaderView, you will find methods that set up appearance and behavior of row or column header for item views. You can resolve your problem by one of these methods:
void QHeaderView::stretchLastSection( bool stretch )
As Davy Jones mentioned.
Example:
QTableView *table = new QTableView();
table->horizontalHeader()->setStretchLastSection(true);
void QHeaderView::setResizeMode( ResizeMode mode )
As mode you can set QHeaderView::Stretch or QHeaderView::ResizeToContents.
Unfortunately this method have a drawback - after it's apply you will not be able to change size of columns (or rows) manually (in GUI) or programmatically.
Example:
QTableView *table = new QTableView();
table->horizontalHeader()->setResizeMode(QHeaderView::Stretch);
In PyQt5 you can achieve this in your table_widget by doing:
header = table_widget.horizontalHeader()
header.setSectionResizeMode(QtWidgets.QHeaderView.ResizeToContents)
In my project I've faced the problem of hiding row count in QTableWidget, I need to display the table but without row numbers and borders, here is standard QTableWidget.
how to hide row count and borders of cells and color the colums, any suggestions?
You should change the property of QTableWidget. Provided you are using qt-creator, just right click on your table widget in your form(name.ui) and click edit items and then untick translatable property for rows and column. You can change the color of column by changing its stylesheet.