Qt event filter mouse click. Reimplementing QObject::event() (as QWidget does).
Qt event filter mouse click. See full list on doc.
Qt event filter mouse click I have an array of buttons right next to each other, and I'd like to be able to let the user click one and then drag the mouse to click any other buttons they hover over. Event filters are subclasses of the QObject class that you can attach to a given object to intercept events before they reach the target object. Mar 7, 2024 · @Pl45m4 Problem Solved Re: qt C++: eventFilter does not see 'MouseMove' event Thanks to everyone who contributed to solving this issue. To do that I have installed eventFilter and through it, I am using ContextMenu to create right click menu. If you do this you get Tab key presses, and you get to see the events before any widget-specific event filters. ) mainwindow. While QWidget::event() is a powerful mechanism for handling events in Qt, it can also lead to some common pitfalls if not used correctly. Note that application event filters are only called for objects that live in the main thread. io Feb 1, 2013 · For the simulated event, the event filter is not triggered. But since I am using a filter, the event should first be sent to me. The following is the code for the event filter in Jambi, but I hope I can modify an answer given in Qt for Jambi. Anyone knows how to properly implement this ? Thanks Mar 16, 2025 · Understanding Common Errors. Here are some of the most frequent errors and their potential causes: Sep 1, 2011 · To get all of the applications mouse events you would need to install the event filter on the application object. Apr 12, 2019 · Global event filters even see mouse events for disabled widgets. Reimplement the QWidget event handlers, QWidget::mousePressEvent(), QWidget::mouseReleaseEvent(), QWidget::mouseDoubleClickEvent(), and QWidget::mouseMoveEvent() to receive mouse events in your own widgets. . h @class MainWindow : public QMainWindow, private Ui_MainWindow Jun 25, 2014 · With the first approach you should subclass QPushButton and override mousePressEvent there, not in the main window that holds the button. Jun 5, 2020 · calling grabMouse() to get all mouse events inside of it; capture each mouse event in the eventFiler() method; now, the problem I have is that the only mouse event which I cannot catch is the left click, and I know that because my eventFilter method looks like this: Sep 1, 2011 · The problem is that no matter how the eventFilter is inserted, and no matter how many places we insert it, we only see a QEvent::MouseButtonPress event when the mouse button is presses over the Qt window where there is no Qt button widget defined. 我有一个QGraphicsView ，其中包含许多QGraphicsItem 。 If I click mouse right click on any QGraphicsItem, the item should get select and right menu options should appear and then I will choose one of the options among them. If the eventFilter() function returns true , the event is considered handled, and Qt stops propagating it further. I have mousePressEvent and mouseReleaseEvent implemented to set a boolean depending on whether or not the mouse is pressed down. Apr 12, 2019 · Event Filters on QObject. In summary, I created a subclass of QGraphicsView (named MyQGrphicsView) to capture mouse press and mouse move events, and needed to use QGraphicsScene (instead of QGraphicsView) and the viewport. See full list on doc. This works just fine. (e. If I double click: Mouse Pressed Mouse Pressed Mouse Released Mouse Released Mouse Pressed Mouse Double Clicked Mouse Double Clicked Mouse Released Mouse Released Feb 7, 2018 · But I do not get a mouse press event if I click on any QWidget inside the QTabWidget, such as buttons or a text edit. I used an event filter in the QWidget to detect the mouse events. g. Such global event filters are called before the object-specific filters. Apr 7, 2016 · The QGraphicsView has to take mouse press and release events to detect a swipe . I took a look into Qt's source code, and noticed that upon a 'real' mouse click, QApplicationPrivate::sendMouseEvent is called which does a few extra things specific to mouse events. At the same time push button should run a small function on clicked. For example you can attach a filter to a button and the filter will get mouse press events before the button does. These widgets would (I suppose) be grand-children of the QMainWindow. Apr 9, 2019 · Now we fall in xcbEventType == XCB_BUTTON_PRESS on button press but casting to xcb_button_press_event_t seems to have no meaning since root_x, root_y, event_y and event_y members have always the same values anywhere we click. Reimplementing QObject::event() (as QWidget does). qt. Sep 26, 2020 · That for some reason fixed the issue with pressing not being registered, but now, it's STILL registering all the events twice. This is very powerful, but it also slows down event delivery of every single event in the entire application Mar 16, 2025 · Event Filtering When an event occurs within the dialog or its child widgets, Qt calls the eventFilter() function of the object that is the event filter for the target object. Shouldn't I be able to install a mouse event filter on the parent and receive events for a click on any subclassed descendant? Sep 14, 2011 · I want to have mouse press event & mouse release event on QTableWidget my code is @ #include #include #include CTestDlg::CTestDlg() { ui->setupUi(this); u I have a QGraphicsView which contains many QGraphicsItem. I guess it has got something to do with context events getting generated by right clicks (a pop-up menu gets generated). Jul 9, 2021 · It is also possible to filter all events for the entire application, by installing an event filter on the QApplication or QCoreApplication object. With the second approach you install the filter on the button object eg. ianyc tzyw nbhpina rwkzmp anw qgxpl ydtqvjz nrfo gaaxi vvvwb chgi ezej iya rpfjxdq oksu