I am doing work on Qt. i am not using android. It's just a desktop application running on windows/linux.how to know which component (placed on a widget or form ) is currently focused ?
i have onscreen keyboard which appears when a QLineEdit,QTextEdit or QPlainTextEdit get focused and hide when these lost focus.But when i switch focuse from one TextEdit(or lineEdit,PlainTextEdit) to Another TextEdit(or lineEdit,PlainTextEdit) my keyboard hide and again show.I just want to stop this
If you want to stop the keyboard from flickering when the widget it's coming from and the one it's going to are similar then you could perhaps implement a timer. I imagine you have the lost focus signals going to your code that is hiding the keyboard. Instead of really hiding it, you can start a timer like
QTimer::singleShot(500, this, SLOT(really_close_keyb()));
Within that really_close_keyb() slot you could implement code to check if the widget that currently has focus should have a keyboard or not, and if it should then you don't hide it.
With this your keyboard will be up for 1/2 sec after the user focuses out of a line edit, giving enough time to focus on another one without losing the keyboard. Adjust the timing to suit.
Related
Background
I'm building an application which runs in the background, and where the mouse cursor is moved programmatically into a dialog when the dialog "pops up". I have done this using QCursor.setPos
Problem
The problem I'm having is that if the mouse button is pressed down when the user is interacting with something outside the application this might lead to unwanted things happening. For example if the user is changing the volume and the mouse is moved the volume might go to max or min
Question
Is there any way (in Qt) to do a mouseup programmatically?
If I do this before changing the position of the cursor it seems to me that there is less risk of problems (though there might be other problems resulting from this approach)
I saw once someone making the GUI in QT and he had something I have never seen until now: They looked like big buttons one after another and when you clicked on them, the buttons below were going down, making space for the dialog or tab. It was like, if you click on the button "Draw", suddenly below the button a tab or a dialog or ??? appeared with all the GUI components (radio buttons, listboxes, ...) that you need for draw. When you clicked on another button, this GUI disappeared to make space for another GUI. Does anybody know what it is?
Qt does support tabs.
They are actually different widgets you can switch from in the same window.
Here you can find an example on how to use then: http://qt-project.org/doc/qt-4.8/declarative-ui-components-tabwidget.html
Inside a tab it's just like a normal widget.
I'm using Qt with C++, and I want to make a button that keeps looking pushed down after it is pushed and released. I'm currently making buttons on a QToolBar and doing something like toolBar->addAction (icon, tr("Text"));. This makes buttons on the toolbar that display the QIcon named icon and display "Text" on hover-over. They also look pushed down as the user is pushing them, but stop looking pushed down when they are released (as is reasonable for most uses of buttons). I need something different, however: I would simply like the buttons to remain looking pushed down after they are released, perhaps until they are clicked again. It would be best if I could just call some function on a button or on the toolbar that could give me the capacity to control whether a button will look pushed down or not pushed down when it is displayed. That way I could just control this aspect of button appearance programmatically.
What's the easiest way to do this in Qt? I've seen fancy ways of doing it involving borders and very complicated setups, but I was wondering whether there might be an easy way to do it.
Add QPushButton to the toolbar using addWidget and then make the button checkable.
I am trying to use QSystemTrayIcon for my application and i am facing some problems.
It is the first time i use qt so i am not really used to it.
I followed this tutorial to make a system tray icon but i fail to customize it.
I want to have a button show/hide and not 3 show, hide, restore. These actions are really confusing for a newbie and i dont know what to do and what to connect.
I tried some things but with no luck.
Also when the system tray menu appears if you click somewhere else, the menu stays open.
Any way to solve this thing too?
If you want to remove one of the menu items, modify the createTrayIcon function so that it only adds the actions you need (and clean up the unused members once you get it to work). It's that simple.
If you want a single menu item or button to toggle between visible and hidden, you'll need to create a custom slot that calls show() or hide() (or setVisible(bool)) depending on whether the widget is hidden or not (use isVisible() for that for example). Then connect your action to that slot.
Read the Signals and Slots documentation and examples for information about how to create a new slot.
I render Qt gui elements on my own 3d application screen by rendering Qt stuff to QImage and then drawing that on the screen. I redirect input to QGraphicsScene, but not everything works. Clicking buttons works fine while clicking QLineEdit or web page elements in QWebView doesnt. However doubleclick seems to work - doubleclicked QLineEdit would select some text, but still would not gain focus. What could be causing this?
I had the exact same problem. It seemed i had
QGraphicsView.keyPressEvent(self, keyEvent)
implemented in my graphicsView. Had to resend the event up the chain of inheritance.
I also implemented keyboard event sending. No matter how i send events (QGraphicsScene::keyPressEvent()/QGraphicsScene::keyReleaseEvent() or QApplication::sendEvent) text is not typed into control, even if some text is selected in QLineEdit (text should be overwritten, shouldnt it?). I suspect this is because of QLineEdit not gaining focus by clicking it, but i cant find out why it is not focused. All events are sent to my subclass of QGraphicsScene.