I have a QtGui.QVBoxLayout widget which exists inside a main QtGui.QGridLayout layout, which extends and centers the items all over the place (The left side)
I want the items to get stacked up at the top of the widget (The right side)
How can I achieve this? I know it has something to do with SizeHint, but I'm not sure how to use it.
A QBoxLayout will distribute the widgets evenly over the available space. The easiest way to keep all the widgets packed together at the top of a QVBoxLayout, is to add a stretchable spacing at the bottom that will push all the widgets up.
You can add a stretch that will take up as much space as it can with QBoxLayout::addStretch().
Related
I have a QDialog window like this and I want to delete the space between 'Length', 'n', 'm' and corresponding QLineEdit input boxes. How can I achieve that ?
If you use gridlayout, I am not sure why your output looks like that. Generally Qt will not leave huge empty space like that, There are three possibility I can think of:
You have many SPACE after Length:, M: or N:
The layoutHorizontalSpacing is too large in your grid manager.
The layoutColumnStretch was set to in favor of label in your grid manager, should be "0,0", not "1,0". I mean, stretch of Label should not be higher than lineedit.
Still, I would use a simple form layout in your application.
All you need to do is reset the alignment of the labels:
label.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlighVCenter)
This can also be done in via the Property Editor in Qt Designer.
You have to decide what to do with the space you want to remove :
Reduce the whole widget : it depends on the surrounding layout, adding an horizontal layout on right or left of it will put the space out of your widget.
Space on the left of your labels : you can align the label text to the right as ekhumoro suggested, or directly reduce and align to the right the whole frame by adding an horizontal spacer on its left (in the surrounding layout).
Space on the right of your line-edits : like above you can add horizontal spacers or reduce and align the frame.
Expand the line-edits : remove their fixed width (default horizontal policy is expanding) or set a bigger one.
The point is : the space has to be somewhere except if you reduce the parent widget or enlarge some the inner widgets. Size-policy is useful to tell which widget should take the available space, spacers are useful to let empty space between widgets.
What I'm trying to accomplish is a very simple and straight forward need, or I thought, but for the life of me, I can't seem to find a way to do it.
In my qt application I want to be able to make a widget or a layout fill the entire space of the parent widget.
For example, let's say I want to have a label with a fixed height and beneath it a stacked widget which occupies the rest of the height of the window.
Here's what I do in the qt-creator designer:
drag a label to the form
drag a stacked widget to the form
select both of them and then right click > lay out > lay out vertically
select the verticalLayout object and in the layoutStretch property have 0,1
Now, how do I make the verticalLayout occupy all of the width/height of the centralWidget?
Nothing seems to work for me.
Thanks.
You've merely put two widgets in a layout, but you also need a layout on their parent widget - on the form. Here's what you should do instead:
Drag any number of widgets to the parent widget (the form). Arrange them roughly the way you want them to be once laid out.
Right click on the form. Select "Lay out >" submenu.
Choose the desired layout from the menu: horizontal, vertical, grid, etc.
I'm developing an app with a complex hierarchy of widgets and layouts, but in short it has a central widget with a formulary as upper widget and a QScrollArea as buttom widget (by means of a QVBoxLayout).
That QScrollArea represents a list (grid layout indeed) of QPushButtons which can contain a huge number of buttons (or not).
I want my app fits the following constraints:
Both (form and list) consume all available horizontal space, redistributing its contents to fill all horizontal space (nor SpaceItems neither contents margins).
Both must save as vertical space as possible, in order to make "lines" close to each other.
I've solve partially my problem making use of setSizeConstraint(QLayout::SetFixedSize) on the form, which shrinks it vertically, but also horizontally, causing that both, list and form, have different widths, wich doesn't look like very well.
How can I achieve that? I mean, how can specify something like grow horizontally to fill the widget but shrink vertically has much as possible?
Add a spacer as the last item to the layout:
gridLayout->addItem(new QSpacerItem(10, 10, QSizePolicy::Expanding, QSizePolicy::Expanding), lastrow, 0);
I think this is what you want:
If you know how many columns you will have (and it doesn't change), insertStretch() in the last column (although it might give you the same effect as using a spacer).
int columnCount = gridLayout()->columnCount();
gridLayout->insertStretch( columnCount(), 1 ); // Default stretch for other
Note that this will resize your buttons to the size Qt thinks they should be unless you are explicitly changing their widths.
I am trying to place a set of buttons so that they are anchored to the bottom right of the screen. My problem is that whenever I resize the screen, the buttons are not anchored to the bottom right, but stay in its current position.
I have placed two Push Buttons inside a Horizontal Layout. I then placed this layout inside a Grid Layout, which contains a Horizontal and Vertical Spacer. I have modified the Grid Layout layoutSize property to SetMaximumSize.
What am I doing incorrectly, so that I can get my buttons to be anchored to the bottom right?
You have almost everything just right here, but you probably overlooked something that is really easy to miss when you first start using Qt Designer.
Your grid layout is sitting inside your widget with a fixed size and position. It too needs to be managed by a layout. If you take a look at the Object Inspector on the top right (that contains your hierarchy) you will probably see your top level widget with a red icon. This indicates that it contains no layout. You have two options to fix this...
Have your existing grid layout placed into another main layout (like a vertical layout). You would simply right click on your top level widget in the Object Inspector -> Lay Out -> [Choose a main layout type].
Have your grid be the main layout. To do this you would need to remove the grid layout and have your child items arranged exactly how you have them in that picture. Then follow the previous option, right clicking on the top level widget (or the blank background) and choose Lay out -> Grid. This will pop your widgets into a Grid at a best visual fit (which you can then fix if needed), and your grid will be the top level layout.
That grid layout will make placing other widgets quite hard. Try this instead:
Add (from left to right) horizontal spacer and the two buttons.
Multiselect them all.
Select "Lay Out Horizontally" (Ctrl-H) from the Qt Designer's (or Qt Creator's) top toolbar (not from the widget box in the left!).
Add vertical spacer on top of the previous widgets.
Select the main window by clicking it (none of the added widgets are now selected).
Select "Lay Out Vertically" (Ctrl-L) from the top toolbar.
Done.
It seems that you're doing it correctly. Just forgot to apply a layout to your central widget, right? The Grid layout should be arranged in your central widget. The more convenient way is to remove grid layout widget and lay out the central widget in a grid ;-)
I'm having trouble using the layout manager system with Qt. This is going to be a Symbian app, so it should resize to different devices.
This is done by using the Layouts.
On the image below I used the Vertical Layout, but I don't understand how I can decide how much each cell should take in width and height.
I want the blue to be a top label background, but I don't want it to be as high as it is now.
Does anyone know how I can do this? (I'm new to Qt :))
You can set the maximum size for a widget by right clicking it and selecting 'Size Constraints'. Under that menu you can find actions that allow you to set the current displayed size as the maximum / minimum size for vertical / horizontal or both directions.
You can also set the numbers by hand by selecting the widget and by setting the number in the 'Property Editor'. They should be under the QWidget properties.
You cannot set the Height of a vertical layout directly, but you can set the height of the widget in which the vertical layout is.
If you want to split your Widgets so that the top widget takes 33.33% of the space, use the Stretch values. Set the top widget to 1 and the bottom widget to 2.