when I create a QHBoxLayout and I add widgets in it with addWidget and then call myLayout->setAlignment(newWidget, Qt::AlignLeft), this only snaps the first widget I add. When I add other widgets and set their alignment to left too, they still start off at the center of the layout and then get squeezed in the more widgets I add. How do I make them all stick to the left next to each other?
If I understood it correct, what you want is to have your widgets in a horizontal line but as left as possible?
If so you can add your QHBoxLayot to the general this->getLayout()->addLayout(YourLayout)and then use setContentMargins(); or setStretchFactor(QWidget * widget, int stretch)
Without the code is difficult but ... Another possible problem can be the widgets size. You can fix it using setSizePolicy(...) with the MinimumExpanding setSizePolicy( QSizePolicy::MinimumExpanding, QSizePolicy::Preferred );
Related
I need to update the QSplitterHandle position when QSplitter child widget is resized due to other reason, than moving splitter handle. Particularly, I have the composite widget inside the splitter, and one of it's children is hidden.
I've tried the following things:
setting QSizePolicy to widget.
setting QSizePolicy to the other widgets in QSplitter
setting stretch factors to the widgets inside QSplitter
I've asked the same question at QT support center, and here is the answer:
Unfortunately there is no automated update function for handle position. The setSizes() function is a good option to update the sizes, but I can see the problem with recalculating the sizes every time. Another way is to implement your own splitter and call its protected function moveSplitter(). You still need to calculate the position where the splitter handle needs to be moved to, but you don't have to recalculate all widget sizes.
I am using a QScrollArea with a custom QWidget. The problem I am facing is that whenever the scrollbar appears, it leads to shifting of elements in the widget. So, I want to reserve some space, so when the scrollbar appears or disappears, the widget is not affected. How can I achieve this?
scrollArea->setWidgetResizable(false);
I encountered this problem and just solved it(might not completely).
I set a fixed width for scroll widget and QScrollArea, and set QScrollArea Horizontal SizePolicy fixed, and hide HorizontalScrollBar.
Sample code
QWidget *pWidget = new QWidget(this);
pWidget->setFixedWidth(500);
pWidget->setLayout(...)
QScrollArea *pScrollArea = new QScrollArea();
// Same with widget
pScrollArea->setFixedWidth(500);
pScrollArea->setWidget(pWidget);
pScrollArea->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
// Needed.
pScrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
I also find a Bugreport: QTBUG-2347
QScrollArea: a new scroll policy that reserves space for the scroll bar, and it is closed. But I don't know whether the bug is fixed and what's the solution.
I have the following code in the ctor of my main window widget, in my Qt App. No matter how I align the buttons added to the QGridLayout, they always stay in the upper left corner, on top of each other.
Can anybody tell me what I've done wrong, I can't find it.
btn_File= new QPushButton("&File", this);
btn_Close = new QPushButton("&Close", this);
btn_File->setAutoFillBackground(true);
btn_Close->setAutoFillBackground(true);
QGridLayout * layout = new QGridLayout(this);
layout->setContentsMargins(20,20,10,10);
layout->setSpacing(5);
layout->addWidget(btn_File,2,2, Qt::AlignRight);
layout->addWidget(btn_Close,1,1);
this->setLayout(layout);
EDIT: It seems that only the btn_Close is being drawn. I just tried to add a QComboBox to the grid, and it doesn't show up.
The problem was that my main window was derived from QMainWindow, in which you need to add a CentralWidget before adding GUI elements. I changed my main window to derive from QWidget instead, and now it works.
tried calling this->adjustSize() at the end?
qt layouts really suck!
alignment on qgridlayout depends on the size of the objects, how many cols an object needs, and the size of the biggest object inserted.. so it is very difficult to put objects as you want...
i suggest to use setGeometry or move instead!
Hello everyone, here is my code:
myplot *p = new myplot(gao.structpayloadgraph,
gao1.structpayloadgraph,
gao.structcol-2, "payload");
ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->scrollArea->setWidgetResizable(false);
p->resize(ui->scrollArea->size().width(), ui->scrollArea->size().height());
ui->scrollArea->setWidget(p);
I want p to take up the full available space of the scrollbar area and fit itself. However, the appearance looks 'squeezed' even though I called the resize function. What should I do to achieve the desired effect?
You have to treat the scroll area content widget as a normal QWidget. If you want automatic resize and you must use layouts in Qt. Try the following :
QVBoxLayout layout = new QVBoxLayout( ui->scrollAreaContent);
layout->setMargin(0);
layout->setContentsMargins(0,0,0,0);
layout->setSpacing(0);
ui->scrollAreaContent->setLayout( layout);
layout->addWidget(p);
NOTE: ui->scrollAreaContent is a guess, but I think you are using ui files and default content widget is named like that ...
Go to the top right of the QT creator designer screen (Object, Class), right click on the QScrollArea row and select the "Lay Out" menu item, choose a layout (eg vertical or horizontal layout), make sure that your QWidget has a minimum or above size policy. Your scroll widget should now resize with the layout.
I want to place some widgets in a parent widget in some random places, like one button at Point (10,10) and another at (15,40), etc. How to achieve this?. QGridLayout is pushing everything into row column style. But I want to put the widgets whereever I want,Can anybody help me?
If you really want to set absolute positions, I would ignore using a layout altogether. You can manually set the positions of elements by using the move() function or the setGeometry() function.
QWidget *parent = new QWidget();
parent->resize(400, 400);
QPushButton *buttonA = new QPushButton(parent);
buttonA->setText("First Button");
buttonA->move(10, 10);
QPushButton *buttonB = new QPushButton(parent);
buttonB->setText("Second Button");
buttonB->move(15, 40);
Side note: I would avoid setting absolute positions of elements in Qt. Why? Well, Qt tries to be a platform-independent GUI library. On different platforms, a lot of display things can change (i.e. font size of text in push buttons) so the size of your actual push buttons can vary to accommodate large or smaller font sizes. This can throw off your meticulously spaced push buttons is you use absolute positions as in the example above.
If you use layouts, overlapping buttons or buttons falling off the edge of your window can be avoided.
You can see my answer for overlay button in QT: Qt Widget Overlays. This may help you to achieve what you want.