Qt trigger resize event Aug 28, 2012 · Inside this widget I have the QWebView, and when the parent QWidget on the QWebView resizes, I want to handle with the event "onResize", on any other similar event. Apr 12, 2018 · As you can see I create two widgets and when I resize widget1 or widget2 I send a message in stderr to see if the resize is detected and when a resize is done in widget1, I post the event in widget2 : void Widget1::resizeEvent(QResizeEvent *event) { qDebug() << "Widget 1 : resizeEvent"; QCoreApplication::postEvent(m_pOtherWidget, event); } Jun 14, 2013 · Or on the other hand I may want to draw something else on the screen during resize of window. This doesn't immediately trigger the paint event, but rather schedules it to be processed later. In general, events come from the underlying window system ( spontaneous () returns true ), but it is also possible to manually send events using QCoreApplication Mar 6, 2021 · I would like to perform an action after I resize a QMainWindow (dragging the mouseafter cloicking the border or a cornerpoint. Resize events are sent to widgets that have been resized. Scheduling the paint event The function marks the widget as needing a repaint. ) Straightforward connecting a slot to a resizeEvent is not what I need, as while resizing the QMainWindow many of these events are emitted. Jul 7, 2024 · 文章浏览阅读2. Feb 10, 2009 · Hi, I have a Dialog that contain one Widget and the tipical OK_Cancel buttons. The obvious approach would be to just emit a signal from the main window's resizeEvent and connect it to all the widgets which need it, but there will be lots of such widgets, so I would like to avoid this if possible. Jul 3, 2011 · What is happening is that in the frame to the right, I am playing a video clip that can be of various resolutions. Jun 4, 2013 · Additionally you override QGraphicsView::drawBackground() which is virtual and gets called by Qt on resize of the viewport. Nov 20, 2013 · It is like my event filter is filtering touch events out, or the TouchEvents can't go through layers, because if i remove all GUI(only have mainwindow left) i do receive the touch inputs i want, and when I change centralwidget, and add a new ui element / widget i can't receive the touch inputs. Aug 14, 2018 · Is it by design that exiting the application with QApplication::quit() does not trigger closeEvent() of the main window? I was under the impression that qApp->quit() is the right way to exit the app, and the right slot to connect the "File -> Exit" menu action to. See also QWidget::resize(), QWidget::setGeometry() Definition at line 546 of file qevent. Probably I didn't explain myself enough clearly. Cause If you modify the dialog's size within the resizeEvent() function, it can trigger another resize event, leading to an infinite loop. I don´t know the size of the window or anything else, so the Event i emit i don´t know what should be there. QTimer. By default, events are dispatched to event handlers like timerEvent() and QWidget::mouseMoveEvent(). I just want to trigger it when the MdiArea is resized – As I stated in my question, I didn't want to use events because it's a whole lot of unnecessary work to accomplish something extremely simply. Mouse move events will occur only when a mouse button is pressed down, unless mouse tracking has been enabled with setMouseTracking(). So far we've created a window and added a simple push button widget to it, but the button doesn't do anything. If you must When the Qt runtime is automatically called the resize function event or other window control size changes generates a Resize event. window. Parameters. I would not expect a resize event unless the widget is actually resized. Although we don't see the internal logic of childEvent(), the layout automatically recalculates the positions and sizes of both buttons to accommodate the resized button1. But for some bizarre reason, when I apply this logic on a QToolButton (for showing some custom text popup on hovering over it), the button becomes invisible, although hovering over where it is supposed to be reveals the popup all right, and even the cursor becomes pointer as expected, given I set it like that for the button! Jun 19, 2019 · When undocking I resize the main window to be the size it would have been without the DockWindow but in doing so the right two columns disappear out of view. I want the frame to resize depending on this resolution, which also means that the buttons and window have to move/resize accordingly. g "use sizePolicy" or "use frameGeometry" or "use geometry" or "use sizeHint". . But in theory that should be much simpler than your mouse move approach, even if that is a little dirty too because it may use an "unnecessary" resize. You see this all the time. I Oct 28, 2018 · If I trigger the resize event again after initialization by dragging the screen around it gives me the correct width, but it shouldn't require that. My override of resizeEvent is like this: def resizeEvent(self, event): super(). Feb 21, 2007 · , we can handle the native Window events before they become QT- events. This resize triggers a child event within the layout (QHBoxLayout in this case). It generates Events. The code above does not trigger it. QMouseEvent supports mouse button presses, double-clicks, moves, and other related operations. May 11, 2017 · However, the resize events of the children seem to trigger sooner than the resize event of the parent. Apr 26, 2025 · When resizeEvent() is called, it is passed a QResizeEvent object as an argument. Nov 1, 2019 · I want to do board with square widgets. Dec 24, 2011 · Welcome to Qt Centre. Jul 18, 2022 · If you are using a single thread, setting up an event watcher using SDL_AddEventWatch is not enough. These customWidgets are stored inside a QListWidget like this:. The result is that, after that, all mouse move events are intercepted by the system until the button is released. Adding the QWidget to the QLayout does not change the size of W. I'm using an API to draw. Dec 31, 2015 · Thank all. So, if you resize your window by 100 pixels, there is a good chance that the window receives 50 ( I'm just estimating here, could be less, could be more ) resize events. Qt automatically grabs the mouse when a mouse button is pressed inside a widget; the widget will continue to receive mouse events until the last mouse button is released. h. If you to handle everything through your main window, you should check event filtering. 使得Qt界面的控件随窗口的变化而变化 1. 1. Apr 16, 2015 · @Bremenpl Does it crash when you attempt to resize manually or as soon as you execute the application ? Because resize event will be fired at application startup too. Detailed Description. The event object (Event) encapsulates the state changes in the event source. The latter ones vary depending on your OS type. I searched for any method to detect changing window size. do the font metrics for all the labels this leads to some oscillating of the widgets since they trigger each others resize events and keep going forever. Qt's main event loop (QCoreApplication::exec()) fetches native window system events from the event queue, translates them into QEvents, and sends the translated events to QObjects. Apr 2, 2025 · Hi there. When a resize event is created, it's done using this system anyway so it conforms to what's happening under the hood. event() (which is a virtual itself); if event() is not overwritten, the base class implementation is called, which will look up for the class resizeEvent function and call it with the event as argument. Internal show events are delivered just Dec 15, 2021 · Signals (and slots) allow you to connect disparate parts of your application together, making changes in one component trigger behavior in another. I want the dialog to be resized automatically when I resize the Widget . QtCore. So this is not really an option. Feb 17, 2022 · @musicmante What about a situation where the child widget of a size for example 500x500 is within a MainWindow 1920x1080. You can use it for way more then just window resizing ;) for example to debounce a submit button by passing a higher timeout parameter. The QWidget::event() function is the central hub for handling events in Qt widgets. Event source object delegates the task of May 3, 2020 · In my code I create a new QWidget: QWidget* pobjWin = new QWidget(); I get a pointer to a window: QWindow* pobjWindow = pobjWin = pobjWn->windowHand Qt’s main event loop ( exec()) fetches native window system events from the event queue, translates them into QEvents, and sends the translated events to QObject s. If it does then I would put a breakpoint there to see where the resize events are coming from. Jan 19, 2016 · I would recommend that if you want to trigger a resize event, you do it using the postEvent mechanism. This way I can modify the dimensions of the QDialog and correct the ratio before it goes to the When the "Button 1" is clicked in the onButtonClicked slot, we resize button1. You can override resizeEvent() in your own custom widgets to perform custom actions when the widget's size changes. W owns a QLayout which owns QWidget. The main point is this: I have an application that has a table which contains a lot of images (~a few hundereds) and when you perform a resizeEvent, the GUI lags a bit. The QGraphicsSceneResizeEvent class provides events for widget resizing in the graphics view framework. The Widget have to display an image and I want to resize it to a proportional size forcing the dialog to resize. How do i do it?. I wanted to check that I've correctly identified a dead end in my development. Such changes can be programmatic, user interaction or propagated from your operating system. This is why it works on resizing and not when calling your update() on the QGraphicsView widget. Jul 5, 2019 · void CurveDialog::resizeEvent(QResizeEvent *event) { mChartView->resize(ui->widget->size()); } This works, and the chart gets resizedbut the problem is it is terribly slow! because it will resize for all the steps that user drags the window corner to resize it! How can I do the resize only when there resize is done? May 15, 2011 · The next time Qt’s main event loop runs, it dispatches all posted events, with some optimization. io Sep 5, 2021 · @eyllanesc said in Parent and Child Handling of Events: @D-Drum The documentation for that method says:. I would like to generate the event by hand, or make it happen somehow so it positions the widgets correctly at the beginning. Qt Centre is a community site devoted to programming in C++ using the Qt framework. This is ok IMHO since it's the desired behavior in most cases and can easily prevented for the special cases (e. Apr 26, 2025 · It acts as a gateway for all events that occur within a widget, such as mouse clicks, key presses, paint events, resize events, and more. I would like something like this self. The event handler QWidget::resizeEvent() receives resize events. there's nothing which assures me that from that moment no resize will be called again by the system, something that tells me "ok everything has been created, resized and showed. For example, if there are several resize events, they are compressed into one. Changed the example to always forward the event and in case the event is of type Resize, it emits a Signal, which is can be connected to a slot. May 15, 2011 · Constructs a resize event with the new and old widget sizes, size and oldSize respectively. In the order, here is what is happening: Dec 4, 2009 · I have a QButton with an associated QMenu. Processing the paint event At Jun 26, 2016 · This is okay. Such an event filter is able to process all events for all widgets, so it's just as powerful as reimplementing notify(); furthermore, it's possible to have more than one application-global event filter. necessary (and Qt takes good care to do so), so be sure that you are not implementing something in the wrong way. The QResizeEvent class contains event parameters for resize events. Resize is received by QWidget. I also would need to know when resize is finished - mousebutton is released. It's possible to make that?! 1 Reply Last reply The function can be reimplemented in subclasses to customize event handling and add additional event types; QWidget::event() is a notable example. I am sure all of them may be right, but an example on how Oct 18, 2023 · In the event model, there are three participants: event source; event object; event target; The event source is the object whose state changes. Sep 14, 2006 · The event must be allocated on the heap since the post event queue will take ownership of the event and delete it once it has been posted. 7k次，点赞18次，收藏15次。QResizeEvent是Qt提供的一个功能强大且灵活的窗口或控件大小变化事件处理类，通过本篇文章的学习，你应该对QResizeEvent有了全面的理解，能够在自己的项目中正确使用它。 Mar 24, 2022 · By default, QSizeGrip interfaces with the OS for the actual resizing as soon as it's activated (by pressing the left mouse button on it). Code below is triggered in resizeEvent reimplemented in VideoTableView. the problem is not blocking/unblocking the signal - or when connecting the signal - but having an event which tells me WHEN doing it. Sep 27, 2023 · Hello, I ran into a problem that resizeEvent is triggered when I change the pixmap of QLabel in it (resizeEvent), which is a sub-widget of QWidget in my program. Jan 23, 2020 · Probably I didn't explain myself enough clearly. It is not safe to modify or delete the event after it has been posted. This object contains information about the old and new size of the widget, as well as the reason for the resize. Now i can fix it by call function update draw before 50ms. If you return false, this native event is passed back to Qt, which translates the event into a Qt event and sends it to the widget. const QSize &QResizeEvent:: oldSize () const Returns the old size of the widget. resizeEvent(event) QtCore. e. If you want to drag the main window (or change the size), you can let the components in the window can be scared as the window, you need to rewrite the resizeEvent because the size of the sub-window is fixed after Qt; QTBUG-68500; maximized windows does not trigger resize event. Mar 13, 2018 · I use Qt/C++ and my main window is a frameless window. There are two kinds of show events: show events caused by the window system (spontaneous), and internal show events. Oct 28, 2018 · Hi, I'd add an event filter for the QTableWidget's resize event and trigger that code there so you ensure that you are acting directly on the concerned widget. size – PySide6. arg__1 – PySide6. resize) but resized is not a builtin May 25, 2012 · If the widget has a one of Qt's layouts, this is already taken care of. It seems that the QGraphicsView is getting events it shouldn't be, as a guess, try returning true just for QEvent::Resize and see if that makes a difference. Is there a better way to disable window resizin Feb 3, 2023 · I am guessing that the layout is calling QWidget::resize() directly on your label, and that triggers a repaint of the widget. The QMenu contains a single QWidgetAction with an associated widget. The thing is, as stated in the qt documentation, you cannot block the main thread, so, the best way I found to handle it was spinning a new daemon thread to run the event code without hanging the frontend. Jun 22, 2008 · Welcome to Qt Centre. Also, the 'event' that needs to take place for the program to continue, is a USB event. I have tried various events to try and trigger an adjustment to that TreeView but to no avail. Aug 15, 2018 · If you want the image to have a maximum size but it should resize and get smaller if the window gets smaller you can use the following: pic. The same applies to paint events: update() calls postEvent(), which eliminates flickering and increases speed by avoiding multiple repaints. Example 1: Handling Resize Event for a Custom Widget. Jan 14, 2012 · I've figured out how to trigger an event when the window changes, but this happens when I'm reading window information from the database, and I want to write to the database when the window is reduced, so, I would like to trigger my event based on clicking the reduce button as opposed to just any time the window changes. connect(self. You could probably override QWidget::render() or similar and use scale on the supplied QPainter. [signal] void QMainWindow:: iconSizeChanged (const QSize &iconSize) May 2, 2013 · I am trying to propagate custom Qt event from child widgets to a top parent widget in order to trigger some action based on event type instead of linking signals. When a toolbar button is clicked, a child widget (a game) is shown, overlayed on the main content area. g. Mar 22, 2011 · What I need is possible that is a way to intercept the window resize event. 1. Some classes support more than one actual event type. resizeRowsToContents) and my override of resizeRowsToContents looked like this: Mar 29, 2017 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand I create a simple UI with Qt Designer and convert it to Python codes. 目的. Jan 6, 2016 · Googling the question found a lot of posts on how to use resize to an arbitrary size, and call to resize(int) works fine, but this is not quite what I am asking . Jan 28, 2018 · "propagate" I meant to trigger resize event in all the subwindows. h", you get the struct MSG wich gives you the information of the event. singleShot(0, self. with the way you already mentioned) Feb 10, 2009 · Hi, I have a Dialog that contain one Widget and the tipical OK_Cancel buttons. Nov 22, 2019 · After calling show(), a QEvent. From the Jan 21, 2012 · This is a couple of years too late, but I was working on a transparent overlay widget that would completely cover the parent. Resize events are sent to widgets that have been resized. In the below example, we define a custom widget class that inherits from QWidget. Create a new subclass of QGraphicsView, and handle the resize event there. Returns the old size of the widget. resized. But when you finish painting the Paint event of Qt happen so my drawings were obscured. size of the dialog is (which is taking some time as it's scaling, loading and setting the palette), then after a resize event occur for that said Dialog I execute the code snipped above. I want the video player to stop playing the video if I'm resizing the GUI. It is not guaranteed that the construction of a widget triggers a resize event. The event contains a region() that needs to be updated, and a rect() that is the bounding rectangle of that region. It overrides the resizeEvent() method to print the size of the widget whenever it's resized. Therefore you create 50 labels with the same image. 要将Matlab Command Window嵌入到一个QDialog中，使得这个窗口控件随着窗口大小的改变而改变。这就要重写resizeEvent(QResizeEvent *event)函数。 Mar 16, 2025 · Instead, use timers or deferred calls to update the size after the current event has finished. Jan 18, 2011 · An event in Qt is an object which represents something interesting that happened; the main difference between an event and a signal is that events are targeted to a specific object in our application (which decides what to do with that event), while signals are emitted “in the wild”. For example, you might want to: Dec 17, 2012 · You can override the void QWidget::resizeEvent(QResizeEvent *event) and send a signal out of it: @ void MyMainWindow::resizeEvent (QResizeEvent *event) {// My signal emit mySizeChanged(event->size());} @ Each class subclasses QEvent and adds event-specific functions. In general, events come from the underlying window system ( spontaneous() returns true), but it is also possible to manually send events using sendEvent() and postEvent() ( spontaneous() returns false). [override virtual protected] bool QMainWindow:: event (QEvent *event) Reimplements: QWidget::event(QEvent *event). Dec 17, 2012 · But the main window doesn´t emit the resize at the beginning of the app. resizeEvent（QResizeEvent *event）作为QT的事件函数在窗口控件大小获取方面具有借鉴作用。官方文档说明如下： void QWidget::resizeEvent(QResizeEvent *event) This event handler can be reimplemented in a subclass to receive widget resize events which are passed in the event parameter. Constructs a resize event with the new and old widget sizes, size and oldSize respectively. When I run code it creates nice board but after resize it become looks ugly. I'm not sure if this cascades through the subwidgets Aug 23, 2020 · The problem was that I was handling the resize of the main window, and not the graphics view. This is because SDL_PumpEvents (which is called directly or indirectly by sdl) will not return until resizing is done, effectively blocking your thread. I am trying resize it with resize Event but it exists (probably some errors). It will catch both kinds of resize event. As an experiment, you could replace your custom QLabel with a custom widget derived directly from QWidget and see what happens there. Make sure undoView was initialized prior to this first resize event. May 22, 2019 · I cannot create a functioning resize event for a custom QT class. The event target is the object that wants to be notified. See also QWidget::resize () and QWidget::setGeometry (). QListWidgetItem* item = new QListWidgetItem(); ui->listWidget->insertItem(index, item); ui->listWidget->setItemWidget(item, customWidget); Apr 12, 2017 · This is a very good answer. Aug 3, 2024 · 主要是窗口resize调用或者其他导致窗口事件大小发生变化产生。如果你想拖动主窗口的时候，能够让窗口中的组件随着窗口也能缩放的话，需要重写resizeEvent，原因在于，在构造之后，子窗口的大小就是固定的。 This is a reusable abstraction, so you don't have to handcode timeouts or keep track of global timeoutID's yourself. For example, QResizeEvent adds size () and oldSize () to enable widgets to discover how their dimensions have been changed. After include "windows. Spontaneous (QEvent::spontaneous()) show events are sent just after the window system shows the window; they are also sent when a top-level window is redisplayed after being iconified. onresize to control the time after Nov 12, 2024 · I don't think you can do this with standard Qt mechanics as what you describe differs from what is considered the default behaviour (resize any application - the font size usually stays the same). Over 90 percent of questions asked here gets answered. Apr 26, 2025 · Qt Widget Repainting with update() 2025-04-26. Since I'm using an HID class device, there is no way to set an event to happen without a wait loop. A way I have in mind is to remove (again) the windows control, substituting with a custom piece on the interface, or = probably most correct = manage the resize event in the c++ code and communicate this to the qml sources. oldSize – PySide6. Each subwindow is supposed to resize itself when it gets the event. Layout Conflicts: Solution Use layouts whenever possible to manage the arrangement of child widgets. Constructs a resize event with the new and old Dec 25, 2024 · Moving a window between places on the desktop, whether on the same screen or not, does not change the size of the widget in pixels. So, when the paintEvent comes in, if the size is different to current pixmap size, then paint the stored pixmap anyway, but then set (or reset) a QTimer to trigger a signal to a slot which will refresh the pixmap. The event handler QWidget::resizeEvent () receives resize events. Detailed Description¶. \inmodule QtGui. setMaximumWidth(250) pic. Events are objects in your Qt C++ application, and they are indeed represented by the QEvent class. Feb 1, 2020 · 視窗縮放時會觸發 resizeEvent ，而視窗關閉時會觸發 closeEvent 因此有物件要在視窗縮放或關閉時操作就寫入這些function裡. One of the parts of my GUI is a video player. “Pyqt5 Parameters:. 9. Therefore, I have to handle all the move/resize events myself. However, there's one visual hint I don't know how to trigger, it's when the user drag the top of the window to the top of screen to maximize it. If you are looking for information about Qt related issue — register and post your question. The result parameter has meaning only on Windows. While the resize event fires only for the window nowadays, you can get resize notifications for other elements using the ResizeObserver API. setMaximumHeight(250) Share Jul 16, 2022 · A resize event is posted whenever the size of a widget changes. When I call the function in the constructor the function (a dialog actually) get's called before the window is Sep 10, 2018 · I suspect a problem in the code, but I don't know where to start in this case. Apr 12, 2019 · Different Methods to Handle Events in Qt; Reimplementing QObject::event() Event Filters on QObject; Installing Event Filter on QApplication; Subclassing QApplication and implementing notify() Sending your own events; Summary; What are Events. if the window size is changed and the graphicsView is resized, The scene gets scaled and you can see everything appropriately. In your reimplementation of this function, if you want to stop the event being handled by Qt, return true and set result. Member Function Documentation QResizeEvent:: QResizeEvent (const QSize &size, const QSize &oldSize) Constructs a resize event with the new and old widget sizes, size and oldSize respectively. The event I want to handle is the 'on sizing' and the message is WM_SIZING. resizeEvent(QResizeEvent *event) is Called The Qt framework automatically calls the resizeEvent() function of your QComboBox object. QSize. Now I want to change the content of the widget contained in the menu at some point, and have the QMenu resize itself when shown so that the QMenu is the appropriate size for the content in the widget. That is where the window resize comes in. Currently QWidget::resize() event is fired wheneven mouse is moved even a Jan 24, 2018 · I'm using python3 and pyqt4 and I want some code to run every time my QMainWindow is resized. oldSize ¶ Return type:. Dec 3, 2013 · a resize event always also implies a trigger of a paint event thus you get it. Reported Jun 5, 2019 · I used: setFixedSize(size()); to stop the window from resizing, but the resize arrows still appear when the mouse is over the border of the window. Maurizio Hello, When building PyQt application, sometimes I want to manually trigger the resize event, so as to fit the widgets, how can I do that? Jan 29, 2021 · Hi, When you hover the button, you are not inside QMainWindow anymore for that mouse related event. 0 Back to Qt. If dockwidget has not been added to the main window, this function returns Qt::NoDockWidgetArea. Jul 16, 2022 · A resize event is posted whenever the size of a widget changes. Feb 11, 2007 · Welcome to Qt Centre. Nov 26, 2019 · In my case, my application is running on python (PyQt5 + QML), the event comes from QML code, and is handled in a slot (nothing new here). Oct 17, 2010 · What I need, is to somehow intercept event or signal, when columns (not whole widget) in VideoTableView get resized. installEventFilter() allows an object to intercept events destined for another object. PySide2. If you tell us what you're needing it for, we could help you with that. In my case, I have a QFrame which is the parent of a QTextEdit. 1 Reply Last reply 0 Jan 8, 2019 · Qt窗口大小、位置及其大小改变引起的事件QResizeEvent. Think, that will do the job :> Jul 14, 2014 · void MyView::resizeEvent(QResizeEvent *event) { fitInView(0, 0, 500, 500,Qt::KeepAspectRatio); QGraphicsView::resizeEvent(event); } This way the view will always display the whole scene. Thanks. This happens event based, meaning if you do a fast resize you will get less paint events than doing it slow. As far as what I know about layouts when the MainWindow is scaled down to say 1280x720 the child widget will not scale down proportionally because the MainWindow will still be large enough to accommodate it so it will only shift in position. Jan 23, 2020 · Thanks for the hint - I used the EventFilter. Jul 25, 2017 · A recommendation before starting my answer, do not modify the class that generates Qt Designer, in your case by the name I think you used the template MainWindow, in the following code I added a bit of code that you have removed, what you must do is Create a new class that implements the generated view: Oct 15, 2009 · One approach you could take is to always paint the pixmap, but remember to recreate the pixmap "soon" if the window size has changed. This way I can modify the dimensions of the QDialog and correct the ratio before it goes to the Apr 6, 2021 · Here is a log of the event triggered to be a bit clearer. See also addDockWidget(), splitDockWidget(), and Qt::DockWidgetArea. For example, if you place a child widget in a parent and the parent is too small, the child widget will be clipped. May 2, 2025 · Only handlers registered on the window object will receive resize events. This is the generated code : from PyQt5 import QtCore, QtGui, QtWid Dec 17, 2012 · But the main window doesn´t emit the resize at the beginning of the app. If the widget does not have any child widgets, or uses manual layout, you can change the behavior of the widget using any or all of the following mechanisms: Oct 13, 2011 · "Installing an event filter on QCoreApplication::instance(). Jan 16, 2013 · Using Qt I create a QMainWindow and want to call a function AFTER the windows is shown. This virtual function receives events to an object and should return true if the event e was recognized and processed. You can trigger behaviors in response to user input, such as button presses or text input, or events in your own code. Global event filters even see mouse events for disabled widgets. Apr 26, 2025 · Resize Occurs The QComboBox's size changes due to user interaction (dragging a window border) or programmatic changes (calling resize() or the layout manager adjusting it). May 15, 2011 · Paint events are sent to widgets that need to update themselves, for instance when part of a widget is exposed because a covering widget was moved. If the resize event is triggered too many times for your application, see Optimizing window. and QGraphicsWidget::resize(). The widgets are in a vertical layout. Dec 29, 2018 · When the QTableView is resized I want the entire table to resize its row heights, for each row. QEvent *event: This parameter represents the event object that has occurred. QResizeEvent. I have a custumWidget which displays 3 QLineEdits. Apr 6, 2021 · Here is a log of the event triggered to be a bit clearer. Apr 15, 2020 · In my QDialog constructor (which is triggered when a button is pressed) I set the backdrop image to what the . May 27, 2007 · But the resize events are posted very quickly. Member Function . I found there is a slot QTableView::columnResized(), but I don't know, what event/signal triggers itd. Qt docs suggests that every event posted with postEvent() that have accept() and ignore() methods can be propagated (meaning each QEvent subclass). QGraphicsSceneResizeEvent Class | Qt Widgets | Qt 6. "During resize" I mean time when user has mouse pressed down on window border and moving the window. I. QtGui. You can not do what you want without subclassing, but you can restrict the subclassing to an instance as @reclosedev suggests, meaning that you don't have to actually create a subclass. Apr 12, 2014 · Even if that function is called after the window has been resized you can set the size programatically and that will trigger another resize so you need to be careful and check the values. It contains information about the Aug 13, 2021 · 是一个Qt资源文件的路径。你需要将你的图片添加到Qt资源文件中，并在代码中通过资源路径来引用它。如果你不是使用Qt资源文件，你可以直接加载文件系统中的图片，比如使用。以下是一个简单的例子，展示如何在自定义的QWidget子类中重写。 Aug 26, 2020 · The problem in my case is, that if i e. Lots of other posts are not explicit enough, e. 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