I am working with Qt to create a GUI for a small game theory project I'm working on. I'm using a combobox as a selector for the team. I can align the contents in the dropdown window just fine, e.g.
for(int i = 0; i < ui.comboBox->count(); i++)
{
ui.comboBox->setItemData(i, Qt::AlignLeft, Qt::TextAlignmentRole);
}
I can't figure out how to align the top item that is selected, as you can see here. The contents is not aligned to the left and the name even goes off the screen. Does anyone know how I can align this similarly to the contents in the dropdown list?
I already searched online, but I'm having trouble phrasing the question correctly. Furthermore if I go through the options available to me by the autocompleter when typing ui.combobox-> I don't really see an option that can do what I want.
Not sure if this is the go to fix, but I solved it by setting an icon size for the combobox. What I think goes wrong is that there is probably some default size set, no matter the size of the icons when adding items. My icons were of size 50x15 and so I added the following lines:
QSize size(50, 15);
ui.comboBox->setIconSize(size);
Now it is done correctly and gives the correct view.
Related
When I run my program it will display all content properly, and when I resizing the main window, the layout along with all associated widgets remain fixed, rather than resizing with the main window. I used to increase my all widget and listWidget respect to window computer resolution size but still this not one work properly.
I used this one code finding the system height and width.
QWidget widget;
widget.resize(widget.width(), widget.minimumHeight());
QRect rec = QApplication::desktop()->screenGeometry();
int h = rec.height();
int w = rec.width();
// Increasing the listwidget size
ui->listWidget->setFixedHeight(h);
ui->listWidget->setFixedWidth(w);
//increasing the button size
ui->pushButton->setFixedHeight(h0.2);
ui->pushButton->setFixedWidth(w0.2);
At this link you will find two screenshots that illustrate my problem.
Please resolve to solve my problem. Thanks very much in advance.
When defining the layout of your windows and forms in Qt Designer you have to define each element of your form in advance, in order to have a working layout.
This solution is based on the screenshots provided in the comments to the question. Follow these steps:
Add an empty widget to the central area of your form, if there is nothing there. It will be used as a placeholder for the controls you will add later, and of course you can replace it with whatever widget you want. But you need it there to define a proper layout.
In the property panel, set the horizontal QSizePolicy of this widget to MinimumExpanding.
Add an horizontal spacer to the left side of your progress bar.
Define a minimum/maximum width for the white widget on the left (I guess it's a text area). As an example set the maximum width to 200
pixels.
Make the same for the QTabWidget on the right.
Give a minimum height to the Groupbox on top.
Then give the grid layout to the MainWindow.
You should get something similar in the designer view (I use a dark theme, yours will have different colors of course):
If you complete all steps you should have a nicely resizing window.
For the future: remember to integrally define your layouts, also using placeholder widgets when needed, read carefully the documentation about the widgets size policies (there are several, you need to play with them to fully understand each one) and keep in mind that Qt uses a container based approach which is different, as an example from those used by the .Net framework that relies on the concept of anchors.
EDIT : to answer questions in the comments
You will need to add a layout to any widget that contains other widgets, e.g. adding controls to your groupbox will require to give it a grid, horizontal or vertical layout in order to scale nicely on resize. Again use spacers and size policies to make it look the way you want. If you need to add or remove controls, or change their positions, you may need to brake the layout, rearrange and then set it again.
You can also select groups of widgets and give them a layout e.g. vertical, than another group and set them horizontal and so on... then give a grid layout to the container widget to build a compound layout.
There are endless possibilities, you just need to practice and go through trial and error as for everything else...
You can also do it all programmatically, check the Qt widgets documentation for this. But for complex layouts I would not go that way: it's a lot of code... and you have to compile and run to test every modification.
Using the QtCreator, within the designer you can simply right-click on the parent-widget and add a Grid-Layout.
This one resizes it's children to it's dimensions.
In qt, I have a form that contains among other things, a group with
A combo box
a checkbox
a spacer
a button
Based on some logic, I want sometimes to show another combo box... Where the spacer is, but smaller.
When I add it though, everything resizes automatically
I don't see a way to make it invisible, and yet keep items of the same size when I make it visible again.
I tried making it fixed size... But unless I use fixed sizes and positioning for everything, which I think is a bad idea, the items still move around when I change visibility.
It seems silly... But how can I make my little combo box show up instead of the spacer not next to it ? Spacers don't seem to have a name...
I would do
combo.setVisible(condition);
Spacer.setVisible(!condition);
Very easy... Except how do I access the spacer from code ?
My suggestion is to use a container QWidget instead of the spacer. Here is how it will look:
A combo box
a checkbox
a widget-container
a button
Widget-container is a QWidget with fixed size. Put your combo-box there and it will maintain it's size when you show/hide the combo-box.
Regarding your question (You will not need it but just to know in the future):
how do I access the spacer from code
You can create a spacer from code like this:
QSpacerItem* spacer = new QSpacerItem(0, 15, QSizePolicy::Fixed, QSizePolicy::Fixed);
layout->addItem(spacer);
...
Also you can get it from a layout if you know its index:
QLayoutItem* item = layout->itemAt(index);
But there is no such method as show/hide for layout items.
I'm creating a context menu for certain elements using a PopupPanel; the menu itself is going to be fairly large and complex. What I'm looking to do is to have a list of buttons, plus an image and some text, related to the element clicked.
My problem is that I'd like the buttons to always display directly under the clicked element, because that's convenient for the user; the issue is that when PopupPanel is near the edges of the screen, it automatically changes position to be fully visible, not aligning its left side to the element as usual. I like this behavior, but it moves the position of the buttons away.
So what I'd like to happen is: normally the buttons are on the left of the panel, the other stuff is to the right. When the panel is close to the right of the screen, I'd like the buttons to instead be on the right (and thus under the clicked element) and the other stuff on the left.
Is there a clever way to do this, either in GWT or better yet, using only CSS? PopupPanel itself doesn't seem to tell you when it's going to get flipped, sadly. The only solution I currently have is to manually check the position and width of the popup before showing it and adjust accordingly, but I'm hoping there's a better solution.
Here is what I suggest (based on my own implementation of a similar use case):
Have the position callback implementation accept references (in constructor) on:
PopupPanel element
element on which user right cliked
the content you put in the PopupPanel
Replicate (I know this not DRY but implementation is package private) the code from default position callback
When opening to the right invoke a method that changes the layout of your content (CSS based or otherwise)
I hope it helps. If you find something better let me know.
I was playing with the Config Dialog Example, all was fine. Then I changed something in the right part of the dialog.
Then I found the contentsWidget (QListWidget) in the left part of the dialog became smaller and showed the scroll bars (both Horizontal and Vertical).
I want the QListWidget to show all its content so that no scroll bars are needed.
All items are added at the beginning and fixed. No dynamic.
I guess there is a simply method to let the QListWidget expand to show all its content at the beginning.
Could anyone help me and tell me the magic word?
Here is the code:
contentsWidget = new QListWidget;
contentsWidget->setViewMode(QListView::IconMode);
contentsWidget->setIconSize(QSize(96, 84));
contentsWidget->setMovement(QListView::Static);
contentsWidget->setMaximumWidth(128);
contentsWidget->setSpacing(12);
//contentsWidget->setMinimumWidth(contentsWidget->sizeHintForColumn(0));
//contentsWidget->setMaximumWidth(contentsWidget->sizeHintForColumn(0));
//contentsWidget->adjustSize();
//qDebug()<<contentsWidget->sizeHintForColumn(0);
createIcons();
contentsWidget->setCurrentRow(0);
QHBoxLayout *horizontalLayout = new QHBoxLayout;
horizontalLayout->addWidget(contentsWidget);
horizontalLayout->addWidget(pagesWidget, 1);
I tried contentsWidget->sizeHintForColumn(0), but it didn't work. It was 0. I tried some other methods but nothing worked.
I think you should try:
contentsWidget->setMinimumWidth(128);
This will ensure that no matters what, the size of contentsWidget will always be at least 128, hence large enough to contains the icons.
This code correctly displays an image, and resizes it when the window is resized:
QLabel *imageLabel;
QTabWidget *imageTabWidget;
// new...
imageTabWidget->addTab(imageLabel, "Image");
I would like the same behaviour putting the image in a table (still inside the previous tab).
However all I can get now is a fixed size image:
QTableWidget *innerTable = new QTableWidget;
innerTable->setRowCount(1);
innerTable->setColumnCount(1);
innerTable->setCellWidget(0, 0, imageLabel);
innerTable->resizeColumnsToContents();
innerTable->resizeRowsToContents();
imageTabWidget->addTab(innerTable, "Image");
Is it possible to have a resizeable table at all?
Thank you.
You need to use layouts to get things to re-size how you'd like, see:
http://doc.qt.digia.com/qt/layout.html
Using the designer makes creating layouts much easier. (Create a widget in the designer then create an instance of it in code, then add to the tab widget).