Qt lost focus event I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): Hi, @chris_rookie said in QWidget once lose focus, it cannt get the focus again:. Any idea about get event when click outside the tree widget. Event Chain The focusOutEvent() function is part of the event chain in Qt. QWidget::focusOutEvent() gives me event when it lost focus. (Note that the application programmer can call setFocus() on any widget, even those that do not normally accept focus. Hi, @chris_rookie said in QWidget once lose focus, it cannt get the focus again:. that means when i click on any other widget. QQuickWindow transparent. 针对一个窗口上的多个可编辑控件(比如QLineEdit、QTextEdit等)，我们希望控件在获得焦点之后能够和其他的控件有区别，如果想实现这一功能，就要用到focusInEvent()和focusOutEvent()函数。 描述：一开始我要实现的目的就是，在一个窗体上有多个可编辑控件（比如QLineEdit、QTextEdit等），当哪个控件获得焦点，哪个控件的背景就高亮用来起提示作用，查了下文档应该用focusInEvent()和focusOutEvent(), 在实际过程中，我犯了十分严重的错误，最开始的 I need to call a function to set some widget enable/disable all the time, I don't want to call a function too many times, so I found a event, when the focus is changed from a widget to another widget, I can call my widget manager function. . Taking out the setEnabled(false) on losing focus, the keyEvents are still seen to be delivered despite this temporary lack of focus, which implies Qt is not directing events solely on focus. Using Focus Proxies: Example QFocusProxy* focusProxy = new QFocusProxy(this); focusProxy->setFocusPolicy(Qt::StrongFocus); // Add focusable widgets to The former will tell us, when the table view has lost focus. e, when I click anywhere outside of widget A. So, I have custom QTableWidget. 3 QEvent::EnterEditFocus. Actually i am searching something through which i got event even if i click outside of tree widget. This was what I needed, functionality wise. Ask Question Asked 4 Maybe I could catch the loose focus event on the QTimeEdit editor and emulate enter pressed, because when user press enter, the data get updated even with 1 digit inputted, I don't know if that made sense, the image in the previous post explains it if not :) Here is my setModelData method: @Axel-Spoerl Hi Axel, Happy Christmas to you. I have a groupbox containing several spinboxes. jsulm Lifetime Qt Champion. I installed an event filter with my Qt::tool window and I began receiving events that assisted me in understanding when other parts of my application were clicked, or if the application itself lost focus to another application. 1k次，点赞20次，收藏20次。QFocusEvent是Qt C++框架中的一个事件类，它专门用于处理与焦点变化相关的事件。在图形用户界面（GUI）编程中，焦点事件是不可或缺的一部分，它们允许开发者在控件获取或失去焦点时执行特定的操作。QFocusEvent通常与QWidget类及其子类一起使用，是Qt事件处理 Okay, I got it now: Stuart's suggestion to subclass QPlainTextEdit and put the focusOutEvent() function in there got it called, but: . void QWidget::focusInEvent(QFocusEvent *event) void QWidget::focusOutEvent(QFocusEvent *event) If you use QtCreator, go to your mainwindow. I'm requesting help with the code. e->lostFocus() returned true for both gaining and losing focus. My code: setStyleSheet (QString::fromUtf8("font: bold;")); The focus widget disappears (it gets hidden or destroyed) and the focus chain is broken, which is why the next focus widget can't be established. Look for When a widget loses focus, the event is first processed by the widget itself, then by its parent, and so on until it reaches the top-level widget. Also It receives events when it lose/gets focus or mouse leaves/enters, but it will not receive event occurring outside of it unless it is notified by the widget which received such events explicitly. [/quote] You will end up in an endless loop if you work that way on focus in event. MyLineEdit *Diametro = new MyLineEdit() i've tried but gave me this: symbol(s) not found for architecture x86_64 linker command failed with exit code 1 (use -v to see invocation) Hello, I implemented a slide menu by using some animation and QFrame and layouts, and now I want that slide menu to close/hide whenever the user clicks outside it. You're already in an event handler and you need to get back from it for the dialog to function properly. I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): What I would like is a way to make it so that clicking on the x in the upper right and triggering the closeEvent would automatically change the focus, just like clicking on any other button. Custom The problem is, the focus on the TableView can´t be set. The correct way to identify when an application is deactivated in Qt 5. – While QLineEdit::focusOutEvent() is a common approach for handling focus loss events in Qt, there are alternative methods that can be considered depending on your specific requirements:. To give focus to a widget, use Constructs a focus event object. For example use a QDialog derived class like this: QMainWindow has also two event handler from QWidget. The code then calls setActiveWindow() for that. I'm using QT 5 for C++ and I thought about connecting a signal, which gets fired when I click away, to a focus. That means the focus was changed and I can close my QWindow. myeventfilter. You can do what @JonB said - delay closing until you process your focus loss. You can override this function in your If I have a widget (let's called it A) which has many level of childrens, with each level, has more than one child; what will be the best way to detect focus out event from widget I want the button click to insert text in the widget that had focus lost. 0 and I'm trying to figure out a way to detect when a widget looses focus. J Offline. MyLineEdit *Diametro = new MyLineEdit() i've tried but gave me this: symbol(s) not found for architecture x86_64 linker command failed with exit code 1 (use -v to see 文章浏览阅读1. but it still does not work. This is Qt 6. Looks like your connection to Qt Forum was lost, Qt获得和失去焦点事件(Focus事件) 1. Now, if i click outside the Qt application, it loses focus and doesn't get keyboard events. S Offline. Qt event regain focus MainWindow. Is there any way to force focus so that it never loses focus even if someone clicks outside the Qt window? When the application loses focus, i am able to trap the focus out event, but i don't I have tried overwriting the function "void focusOutEvent(QFocusEvent *event);" In QTableView, it works fine for the focusOut, the selection color stays the same, but as soon as the user mouse back his mouse on the QTableView, we see the gray selection again just like #2 Let's assume you have your MainWindow class and it contains the widget plainTextEdit. Any suggestions would be helpful. 4 Posts 3 Posters 1. It would be helpful to know @j-hilk said in QLineEdit lostFocus problem:. o duplicate symbol _Target in: fresatura. I've dealt with similar situations by intercepting signals or events as necessary and manually setting focus to some other placeholder widget. The reason for a particular focus event is returned by reason() in the appropriate event handler. 重写控件的focusInEvent()和focusOutEvent()函数. , could it be some glitch with improper setting of focus, and Qt doesn't remove focus from QDockWidget before opening modal window? The former will tell us, when the table view has lost focus. MyLineEdit *Diametro = new MyLineEdit() i've tried but gave me this: symbol(s) not found for architecture x86_64 linker command failed with exit code 1 (use -v to see invocation) 2. I've got two widgets I'm trying to keep an eye on, a QTextEdit and a QLineEdit. It will be called whenever your widget has lost focus. In it, I've overriden the following event functions: focusInEvent focusOutEvent keyPressEvent The functionality I've implemented makes it so that the value of the spinbox has only actually 'changed' when the user has pressed the enter key or lost focus (i. Hi, I have a class which derives from QSpinBox. h. Here are some common issues and their I'd like to add the use of the ESC key to return the value to the PrevValue as well as lose focus of the spinbox. The last column (details column) contains interesting stuff to do with the event: e. In this delegate instead of QLineEdi If I have a widget (let's called it A) which has many level of childrens, with each level, has more than one child; what will be the best way to detect focus out event from widget A. I have been attempting to set focus on gameView in between the initial player setFocus and the focusChk() in order to make initial input in the gameView responsive to no avail. 1 Reply Last reply . I have a PyQt4 program where I'm trying to get notified when a window gets focus, following the advice in the QUndoGroup docs: It is the programmer's responsibility to specify which stack is active by calling QUndoStack::setActive(), usually when the associated document window receives focus. How to detect that my application lost focus in Qt? 2. If player has lost focus, then focus is given back to player object. when i came back on the QLineEdit(table) then the editor is close so i can @Axel-Spoerl Actually, I wanted certain actions to be taken before the focus was lost. 9. I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): Then I switch focus to child widget, and as you can see window no longer receives key release event. I understood that Qt remembers the last widget to lose focus and when the application reactivates, the same widget receives a focusIn event. 5. g. The slots that I connected to that signal weren't called. 1, but also happens on 6. So first question is: How can I set the Focus on my TableView (which is hosted inside my QWindow)? Furthermore, I have to get the event, if the user clicks beside the QWindow or outside the Application. o moc_fresatura. e. Hi guys! I have some problem with redefined focusOutEvent. h and search the line "class MainWindow : public QMainWindow". 1. 2025-03-16. Detailed Description. Focus events occur due to mouse actions, key presses (such as Tab or Backtab), the window system, popup menus, keyboard shortcuts, or other application-specific reasons. Raising a QT QEvent::WindowActivate event. Oldest to Newest. I am trying to work out what is responsible for this direction, and if the key events can be obtained somehow. I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): But here's what's interesting: native Qt modal windows show red background along with QDockWidget, meaning that both widgets have focus, whereas native OS modal dialogs show parent QDockWidget in blue. The reason for a particular focus event is returned by reason() in the appropriate event handler. I'm using Qt6 and Qt Creator. bool How to detect when a window has lost focus? I can only find a way to detect when the cursor has left the contents of the window, which is not what I need. @Axel-Spoerl The variable focusWidget set at line 1937 in QApplicationPrivate::notifyActiveWindowChange() points to the QMainWindow derived class for the application. So What I actually i wanted to do achieve like suppose i am entering some values in my QLineEdit then the editor is open after that I press Alt+Tab to open another application. Right click on QMainWindow -> Refactoring -> Insert virtual function. My QWidget window contains a QTextEdit widget named 'myTextEdit'. My intension is that I get a message box when groupebox losses the focus (if values in the spinboxes are changed since entering the groupbox (focus in)). CPP file you also have QString Target; so its actually defi But Qt handles events differently from signals, // don't close and let event loop handle focus loss allowClose = true; // let it close next time setFocus(Qt::OtherFocusReason); // switch focus to something else, e. If you run my example (you can also add object names, and apply the given filter to the application), you'll notice that : While QWidget::focus is a fundamental concept in Qt programming, there are alternative approaches and techniques that can be used to achieve similar results or address specific requirements:. Qt mousePressedEvent called when mouse enter window. @james-b-s Starting an event loop in closeEvent won't work. I see that QWidget class has a protected function 'focusOutEvent' but I don't know how to implement code that uses it. I. Does anyone have a suggestion for what the best way to do this is? P 1 Reply Last reply . I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): @j-hilk said in QLineEdit lostFocus problem:. 48. I noticed when reviewing my connect() functions that Qt Creator's autocomplete converted the const QStringList& type I have also set the focus policy as clickFocus but still the same . The type parameter must be either QEvent::FocusIn or QEvent::FocusOut. h" #include <QMainWindow> QT_BEGIN_NAMESPACE namespace Ui { class @j-hilk said in QLineEdit lostFocus problem:. a) Since a QGroubBox is also a QWidget and this should have the events "focus in" and "focus out" I am wondering why they are not fired. 6. 1. I am lost. remove the function eventFilter and installEventFilter. @Axel-Spoerl Actually, I wanted certain actions to be taken before the focus was lost. For example use a QDialog derived class like this: I have a groupbox containing several spinboxes. Scheduled Pinned Locked Moved Unsolved General and Desktop qtreeview. If a widget is found which accepts focus on mouse clicks the focus is transferred which will lead to an focus-out event on your spinbox. Focus events are sent to widgets when the keyboard input focus changes. Failing that, a way to get the clearFocus event to be handled before continuing on to the rest of the code in closeEvent. QFocusEvent 是 Qt 中的一个事件类，用于表示焦点事件。它是 QEvent 的子类。 (QFocusEvent * event) {qDebug << "Widget lost focus"; // 执行相应的操作 QWidget:: focusOutEvent (event); // 将事件传递给父类处理 } 在上述示例中，我们重写了 QWidget 的 focusInEvent() 函数和 Focus events are sent to widgets when the keyboard input focus changes. The former will tell us, when the table view has lost focus. I'm using qt 4. J 1 Reply Last reply . o mainwindow. There's no signal but if you want to know when your widget has lost focus, override and reimplement void QWidget::focusOutEvent(QFocusEvent* event) in your widget. But the person below me had already voiced the right idea, and I came to it later. 8k Views. So are you saying that the button could some way filter the textEdit's loosing focus event? Or am I looking return QWidget::eventFilter(object, event); and. The latter will tell us, if a focus or a broken chain has gotten in our way. The reason describes the cause of the change in focus. 0. tabbed or clicked away). 2 (or later) is to use the QGuiApplication::applicationStateChanged(Qt::ApplicationState state) signal. 2 the QEvent::ApplicationDeactivate event is deprecated. *edit* I found the QLineEdit has a finishedEditing Qt Widget Focus Loss Event . i. When I opened the folder, the folder under my While QLineEdit::focusOutEvent() is a powerful tool in Qt programming, it can sometimes lead to unexpected behavior or errors. I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): The former will tell us, when the table view has lost focus. The reason is very simple: Your combo box gets the focus, you put it to the QMessageBox. Qt designer QLineEdit lost Focus. You may want to try to set the focus policy (make it accept focus) on your window / root-widget. widget->installEventFilter(this); Are you sure your event filter isn't breaking things ? In any case, you should try first without it. Oldest to Newest; Newest In your case, replace Qt::RightButton by Qt::LeftButton Hey! Is it possible that if you lose the focus when you click away from the QTableWidget? Currently, it doesn't happen. this or cancel button QTimer::singleShot(0, this @j-hilk said in QLineEdit lostFocus problem: MyLineEdit *Diametro = new MyLineEdit() i've tried but gave me this: symbol(s) not found for architecture x86_64 linker command failed with exit code 1 (use -v to see invocation) A widget normally must setFocusPolicy() to something other than Qt. For it I use custom delegate. ; Direct validation Set a QValidator on the QLineEdit to perform There is also a check I run to see if player has the focus once the game is running in gameView. I want to be able to execute some application code when 'myTextEdit' looses focus. Show window in Qt without stealing focus. For example The former will tell us, when the table view has lost focus. I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): @james-b-s Starting an event loop in closeEvent won't work. for a Focus Event it is filled as follows: @eddy said in QLineEdit lostFocus problem: #include you're right . QTreeView focus events and losing selection. ? Anybody Give me Python Code to Capture Focus Event. NoFocus in order to receive focus events. By the time this all gets to the actual Event Filter code the object to which focus is being given is the scroll area that belongs The former will tell us, when the table view has lost focus. Qt 4. i forgot it but now i have this: duplicate symbol _Target in: fresatura. 4. I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): I have tried overwriting the function "void focusOutEvent(QFocusEvent *event);" In QTableView, it works fine for the focusOut, the selection color stays the same, but as soon as the user mouse back his mouse on the QTableView, we see the gray selection again just like #2 I have a non-fullscreen Qt application running on top of a browser on an embedded device. I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): So I'm wondering if I'm missing something that I should do, In this help article, it says that default focus event updates the widget: "[virtual protected] void QWidget::focusInEvent #ifndef MAINWINDOW_H #define MAINWINDOW_H #include "ui_mainwindow. QValidator: Custom validation Create a custom QValidator subclass to implement your own validation logic. But the person below me had already voiced the right idea, and I came @thecipo76 said in QLineEdit lostFocus problem: extern QString Target; and then in the mylineedit. ) @james-b-s Starting an event loop in closeEvent won't work. When a widget loses focus, the event is first processed by the widget itself, then by its parent, and so on until it reaches the top-level widget. But it appears that the spinbox doesn't lose focus until the user clicks on another widget in the window. With this bug I cannot create a custom shortcut implementation J 1 Reply Last reply The former will tell us, when the table view has lost focus. Since Qt 5. I'm puzzled too , the focus change events all have a details section containing the reason for the focus change, then the class name QApplication::focusWidget() and then class name of myTableView->focusWidget(): How to know when the QLineEdit widget loses focus, because I need to execute a function before going to the next widget, but I did not find anything that would help me. @return QDialog::eventFilter(object, event);@ Once a user clicks on the comboBox and the event filter fires, it keeps looping as if the focusInEvent is being called. Actually I designed a form using Qt Designer and want to capture OnFocus Event of QlineEdit Widget on Ui File. #ifndef MYEVENTFILTER_H #define MYEVENTFILTER_H #include <QObject> class MyEventFilter : public QObject { Q_OBJECT public: MyEventFilter(QObject *parent = nullptr); protected: virtual bool eventFilter(QObject *watched, I have a need within a given Qt window (main and dock) to validate data that has been entered in a field-type widget but not a way to directly block the focus out (event). The examples you mentioned only discuss interception of leave event or losing focus event in subclass or by installing event filter. o ld: 2 duplicate symbols for architecture Dear friends, I have a QTableview which have components on the cell like QLineEdit ,QComboBox, QCheckBox. When you click outside your widget the click event will be propagated to the next possible widget. Is it possible to subclass and use it in Ui ? J 1 Reply Last reply . Related. 3. Theres a button that I have that when I click on it, I want it to insert some text in either the text edit or line edit based on which one had focus last. qgef xmavf hfsc ahjw xgihc zwcxrtut wbwr ghdrhgm vgffcg tmobwn cuikfbk lort joizp rqoanvb ykjj