I am working on a small UI with QT Creator and its drag-n'-drop tool (QT Designer). Everything was fine till I realized I had to make some widgets dynamic. For example, I have a checkbox and I want some button to appear only if this checkbox is checked by the user or I would like to change the appearance of another widget when the user clicks on some button.
Is it possible to do it only with QT Designer?
Yes, but it's very limited.
Qt designer have signal&slot editor. Yes, you can connect signal clicked(bool) to setVisible(bool) slot on button and make button visible only when checkbox is checked (see screenshot).
But when You need more complex dynamic interface (e.g. creating buttons), designed will not help You.
Related
I have designed the UI screen which consist a lot of push-buttons and I want to select or can say want to control application using tab key. When I select any particular key, it should change the color of that push-button accordingly.
As far as I know, the focus on using the tab key should work by default and the color of the buttons changes according to focus.
I tried to create a project with several buttons on QMainWIndow and it worked without any additional effort. I'm using Qt 5.15 with KDE on arch linux.
If you want to change the order of the buttons traversal, you can use the button that changes the designer mode in Qt Creator.
And if you want to change colors of the button, you should change the stylesheet of the button with css like code. Here you can see examples of stylesheet customization.
Right now I have a small tool app that runs in the icon tray. When I click on the icon, the app goes into "windowstayontophint" mode. I added a Combo Box on this window. But when I click elsewhere on desktop, and then click the combo box, the drop down window goes to the back of the window. This seems to be a known bug as reported here:
https://bugreports.qt.io/browse/QTBUG-61804
Is there a workaround for this? I am using Qt 5.9.1.
EDIT: Add some code:
This in MainWindow constructor:
Qt::WindowFlags flags = this->windowFlags();
this->setWindowFlags(flags|Qt::WindowStaysOnTopHint);
Then I put a QComboBox in the mainwindow with preloaded items. First time click, the dropdown appears on top as normal. Then I click onn desktop and then back on the mainwindow and combobox. And drop down becomes at the back of mainwindow. CLick on the link above to see what I mean. The bug report also provide screenshot of what is happening.
Nobody want to put an answer, so I answer this myself.
ANSWER: Update to latest Qt.
It did not work for me because I was having trouble updating (noob here). What basically happened was that Selecting "Update" option on Maintenance Tool does not update SDK from 5.9.1 to 5.10.1. It only update certain things like Qt Creator.
I needed to choose "Add or remove Components" and then adding Qt 5.10.1, but only check the MinGW 32bit only. (Uncheck all others otherwise you need them (like android or other)).
Even after that, you also need to manually download CMake (get it from cmake.com) and set it in "Manage Kits" in Qt Creator.
I am currently working in Qt Designer and i am trying to make button change the index of QStackWidget with click signal.
I entered signal editor mode and connected Button to QStackWidget, This is what i got:
As you see in the picture, setCurrentIndex(int) is grayed out, If i choose any signal from QPushButton, there is nothing associated with changing page.
Sorted Question:
How can i change the page in QStackedWidget using a button? (In Qt Designer).
That is not possible directly with Qt Designer, because QButton click signal doesn't send any index or argument, and setCurrentIndex(int) need an argument to chose change the index.
You have to do it using signal/slot in C++ code, or use an other widget like QSpinBox which emit a signal with an integer argument.
i'm programming a Qt Quick application and I'm looking for a possibility to display the user errors. In Qt widgets there is QMessageBox but i can not find any equivalent to this in Qt Quick.
Sure i can create a MessageBox by myself but I can't imagine that there is no given possibility?
I found an ebook on the official site here and there is an Dialog described on page 67 but it doesn't work anymore and i can't find any further information about that. Is it dropped in the current version?
Thanks in advance
There is no Qt-Quick component for this yet. What I do in my application is using the Window QML component. I set the modality property to Qt.WindowModal to have it as a modal Window. You can then use the Button component to create OK/Cancel buttons.
Another thing I do is create these modals dynamically when something wrong occurs using Qt.createComponent() in QML.
Edit: Just discovered a new Dialog component that will be released in Qt5.2 that seems to match what you are looking for: MessageDialog
I am making my own browser with Qt/Webkit for touch screen devices. I want to have My own editbox in browser ( so that when user click on it, I can open virtual keyboard), Touch friendly listbox and other controls.
So In QWebView I want to have MyOwnTextEdit instread of QTextEdit and same for all other UI controls.
Please tell me How can I do it?
I am using Qt embedded linux 4.6.2.
For example, you can see how this kind of things realized in more easy widgets here: link text. It's the first way. The second way is to create you textbox with SIGNALs/SLOTs and also code widgets GUI with Qt styles. Good luck!