Is there any style sheets to use to increase the size of scroll button size in QGroupbox. I have to change the default size.
There are no "scroll buttons" within the QGroupBox. Perhaps you're referring to some other widget?
Related
I have a custom QDialog comprised of a QStackedWidget with QScrollArea widgets for each page of the stacked widget.
I want to set the size hint for the QDialog such that the dialog is just large enough that the scroll bars for the scroll area are not visible when the dialog is first shown (i.e. ensure size of QScrollArea viewport = size hint of child widget in scroll area). Currently, the default sizeHint() implementation for the QDialog has insufficient height, which causes the vertical scroll bar to be shown when first loaded.
I thought this could be achieved by re-implementing sizeHint() for the QDialog, whereby the size hint of the dialog would be adjusted by the amount required for the size of QScrollArea viewport to equal the size hint for child widget in the scroll area (for the first page of the stacked layout). Unfortunately, in sizeHint(), the size of the QScrollArea viewport is set to the default size of QStackedWidget (640x480), and only updates to the correct size once the QDialog is shown.
Is there some way to get the correct size of the QScrollArea viewport before it is shown, or another way to achieve the desired effect of adjusting the size hint of the dialog to prevent scroll bars from being shown when it is first displayed (aside from hard-coding the dialog size).
With the composition of your dialog as:
I have a custom QDialog comprised of a QStackedWidget with QScrollArea
widgets for each page of the stacked widget.
The tricky part is to answer:
Is there some way to get the correct size of the QScrollArea viewport
before it is shown?
Well, before switching to certain page you can estimate the scroll area viewport if it is either correctly set or you can just measure the content going inside the scrollarea. I usually force the widget to demand certain height from the scroll area like that:
wdgetInScrollArea->setMinimumSize( widgetInScrollArea->sizeHint() );
wdgetInScrollArea->adjustSize(); // sometimes it is needed
The the scroll area viewport hint is then more 'adequate':
qDebug() << scrollArea->viewPortSizeHint(); // report
I don't see the code but usually it is not even required to do any custom event handling here, just prepare all the nested widgets like that.
I have the following Qt widget layout
QSplitter
QFrame (select area), a QTableView
QScrollArea (data area)
QWidget (entry and edit form)
The user might prefer to see more of the select area, that's why the "data area" is in a scroll area. I can adjust the size of the "select" and "data area" by the vertical splitter. All fine.
Now I want to implement a convenience feature (keyboard shortcut) so that the "data area" extends / resizes to the (exact) size where no scrollbar is needed. But how can I obtain that height? I could increment height until the scrollbar disappears, but this is stupid.
I do not want the "data area" consuming too much space, but just as it requires to be displayed without scrollbar.
Yes, if I take the inner widget ("entry...") and add some offset (for the QSCrollArea) on top of it seems to work reasonably.
How do I place a widget next to a QScrollbar like here seen:
I use a QScrollArea and overwrite the Horizontal-QScrollBar. First I thought, I could use the paintEvent to draw a text like the "100 %" next to the bar. But I can only overwrite the existing painting.
Now I think, the only opportunity would be to implement the hole QScorllBarPrivate from the source code... anyone any idea?
The main idea is to create an overlay obscuring default horizontal scroll bar and displaing your own bottom line instead.
Create a widget representing the bottom line, i.e. a widget with labels displaying some information and a horizontal QScrollBar, all together put in a hbox layout.
Put this widget in the scroll area without adding it to a layout by making QScrollArea direct parent widget of this widget.
Use move() and resize() on the bottom line widget to position it properly on initialization. Also resize and reposition it on scroll area resize (you can use event filters or inheritance to get to resize events).
Make sure that scroll area's horizontalScrollBarPolicy is Qt::ScrollBarAlwaysOn so that scroll area's internal layout always keeps space enough for bottom line widget to fit in.
Also make sure that bottom line widget has the same height as default scroll bar. It should be easy as long as you remove spacing and margins in the hbox layout and labels (or other widgets) don't require more vertical space than a scroll bar.
Use horizontalScrollBar() to get scroll area's internal QScrollBar and syncronize it with your own bar. QScrollBar has rangeChanged() and valueChanged() signals so you can connect to them and update your bar properly. When user changes value of your scroll bar and triggers its valueChanged() signal, you should set the same value for the internal scrollbar. You can protect from infinite recursion in there by using a flag that indicates that this is your own change.
I currently have the following structure in my form
I have a QFrame (Brown) that has a QScrollArea . Now Multiple QFrames are dynamically added to the QScrollArea (gray).The dynamically added QFrame are composed of a QLabel.
Now here is the problem I have disabled the horizontal scrollbar in the QScrollArea . Thus the horizontal scrollbar does not show up. The problem is that when the dynamically added QFrame (gray) is added to the the QScrollArea. Half of the frame is cut off. This is because I have no way to scroll horizontally. What I want is to have the dynamically added Qframe expand vertically instead of horizontally. Any suggestions ?
Update :
I have a QVBoxLayout inside the QScrollArea
Set the proper horizontal size policies for your dynamically created frames while creating them. One option is fixed size (QSizePolicy::Fixed), the other is QSizePolicy::Maximum (it's not very intuitive, but actually maximum means that the frame won't be bigger than the size specified by sizeHint() function). If you want the widget to expand vertically, set the vertical size policy to QSizePolicy::MinimumExpanding or QSizePolicy::Expanding - whatever works for you.
I have a ui with a QScrollArea Widget. The QScrollArea uses a Flowlayout. My problem is when I add widgets to my layout the scroll area begins to scroll and does not expand when it has room to expand. I want the scroll area to expand to its limit before the scroll bar appears first.
How can I get the scroll area to expand before the scroll bar appears?
can you try doing setWidgetResizable(true) for your QScrollArea
ScrollArea->setWidgetResizable(true);
A couple of suggestions:
Ensure that the size policy of the scroll area itself is Expanding.
Set the "stretch" values of the size policy of the scroll area to a value greater than that of the other widgets in the same layout. Ie:
QSizePolicy policy = pScrollArea->sizePolicy()
policy.setVerticalStretch(1);
policy.setHorizontalStretch(1);
This assumes that the siblings of the scroll area (if any) have a stretch value of 0 (the default).
Subclass the scroll area and override the sizeHint() method.