I had a layout all nicely designed in Qt, but as soon as I clicked on the parent window and set it to a grid layout, things got all wonky. I've read every tutorial I can find as well as the Qt designer manual and just cannot figure out why this is happening. I have attached a screenshot to show the problem:
As you can see, the vertical layout on the left insists on being wider than the children it contains. Both the label and the treeview are set to sizePolicy maximum, and the maximum width is set to 260px. The children themselves stay the correct size, but the vertical layout that contains them doesn't.
The vertical layout in the middle is set to expanding, and the one on the far right is setup the same as the one on the left, only that one appears to work. How do I make the first vertical layout conform to it's children's width?
Also, if I may sneak a second question in, I have a QTextEdit inside the tab widget in the lower right, but it will not fill to take up the space of the full tab view. You can't see that in the screenshot, but if I pull the tabview up, the textedit within it doesn't stretch with it. How do I make it conform to the size of the tab? It's already set to sizePolicy expanding, but that doesn't seem to help.
The problem is most likely that you need to experiment with "stretching" the layout. Stretch sets the size of layout cells in relation to each other. The default is 0, which means no stretching occurs.
In your case, I believe you want to set the stretch of the first column (column 0) to 0, and the stretch of the second and third columns to 1. This means that the first column will always be as small as possible, and the second and third columns will try to be equally wide.
You can set the stretch programmatically quite easily; for example, to set the first column to stretch 0:
layout->setColumnStretch(0, 0);
In Qt Designer you can access column and row stretches as any normal properties.
Related
I am trying to have a QTreeView fit into a horizontal layout perfectly.
My layout setup looks like this:
I want the horizontal width of Vertical Layout 1 to be defined by the required widths of the QTreeView Column Headers. In other words the Vertical Layout 1 should stretch horizontally to make sure its width always exactly matches the width required by QTreeView column headers. Therefore the layout stretch factors of the topmost horizontal layout are set to (0,1) so that the Vertical Layout 1 does not stretch and Vertical Layout 2 does.
This is what it looks like in action:
The good news is that when QTreeView items are expanded, the headers also expand and in turn the Vertical Layout 1 stretches accordingly.
The problem is however highlighted on this picture:
For some reason there is redundant unused space within QTreeView itself, which has constant width in both collapsed and expanded states.
All the headers within the QTreeView are set to Resize to Contents, the Size policy of the QTreeView is set to 'AdjustToContents' and last header section stretch is set to False, which I think is correct:
self.accountsTree.setSizeAdjustPolicy(QtWidgets.QAbstractScrollArea.SizeAdjustPolicy.AdjustToContents)
self.accountsTree.header().setStretchLastSection(False)
self.accountsTree.header().setSectionResizeMode(
AccountTreeColumns.COLUMN_NAME,
QHeaderView.ResizeMode.ResizeToContents,
)
self.accountsTree.header().setSectionResizeMode(
AccountTreeColumns.COLUMN_BALANCE,
QHeaderView.ResizeMode.ResizeToContents,
)
self.accountsTree.header().setSectionResizeMode(
AccountTreeColumns.COLUMN_BALANCE_BASE,
QHeaderView.ResizeMode.ResizeToContents,
)
self.accountsTree.header().setSectionResizeMode(
AccountTreeColumns.COLUMN_SHOW,
QHeaderView.ResizeMode.ResizeToContents,
)
I am using PyQt 6.4 and Qt Designer.
I tried playing around with stretch factors, layout constraints and different header section resize modes, but everything I tried only led to worse results. I don't understand where the extra space comes from, other than that the setup works exactly how I want it to. I must be missing some setting somewhere but I can't seem to figure it out.
Thanks for any tips
When I maximize my window, I want to restrict a vertical layout (and the entire row below it also) so that it has a specific size (lets say a width of 200). How can I achieve this? Below is what I get now. The buttons are stretched too far. I want them to keep a width of 200.
To stop the buttons stretching, use the following steps in Qt Designer:
click on scrollArea in the Object Inspector
click on Break Layout on the toolbar
click on scrollArea in the Object Inspector
click on Lay Out in a Grid on the toolbar
click on scrollAreaWidgetContents in the Object Inspector
scroll down to the bottom of the Property Editor
change layoutColumnStretch to 0,1
These steps should remove an empty column from the scroll-area grid-layout, and make the second column stretch to take up the available space when the window is resized.
You just need to restrict the maximum width of all widgets (in this case the buttons) within the layouts of this grid column to the expected size, else they'll just keep expanding. You may also have to fiddle the horizontal size policy; I seem to remember that buttons were a bit tricky in this regard (or was that the height?), but can't test it right now.
The layout size contraint you tried only applies to the layout's direct parent widget, if it has one, which isn't the case for the vertical layouts here.
For exemple, I want the value of the layoutLeftMargin property to be equal to 1/3 of the parent widget. So when I will resize the windows, the ratio of the widget will still stay the same.
Else, if it's not possible with QtDesigner, how can I do it with code ?
No, Margins are specified in pixels, they can't be relative to the parent widget's size.
However, You can do that in the designer by putting your whole current layout in a Horizontal Layout, add a Horizontal Spacer to the left of it, assign suitable layoutStretch values in the horizontal layout (In your example, this should be 1,2, meaning the original layout will take up twice the space taken up by the spacer, so that the spacer gets 1/3 of the parent widget).
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'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.