Qt trigger resize event. qt; qtablewidget; or ask your own question.

Qt trigger resize event The ResizeEnd event is raised when the user finishes resizing a form, typically by dragging one of the borders or the sizing grip located on the lower-right corner of the form, and then releasing it. Safari on iPad and Safari on iPhone do not have resizable windows. JavaFX getting single resize events. The QResizeEvent class contains event parameters for resize events. General and Desktop. This happens by it listening for the internal how to implement mouseEnter and mouseLeave event in QWidget? You could also listen to the hover events, which do the update() themselves. 4. Yep, been in that kind of situation elsewhere. resizeEvent(QtGui. 1. This is ok IMHO since it's the desired behavior in most cases and can easily prevented for the special cases (e. I found there is a slot QTableView::columnResized(), but I don't know, what event/signal triggers itd. sizeHint()): see above; mainWindow. The Overflow Blog WBIT #2: Memories of persistence and the state of state @StudentScripter said in GraphicsScene: Grouping multiple Items Transforms (resize):. Stage Resize Event (JavaFX) 6. I need the GUI update not to be interrupted when resize event occurs . singleShot(0, self. - in the paint event, check the QTimer. QSize. PySide2. I have polished this missing subclass of QLabel. I'm using Qt Creator 4. Constructs a resize event with the new and old widget sizes, size and oldSize respectively. 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() The Event System¶. When the widget is resized, the resizeEvent() method is automatically called, allowing us to execute custom code in response to the resize event. It resizes as the mouse is dragged rather than syncing items up at the end. This function is in turn only called by UpdateBounds(), which is called by several mechanisms, primarily including the handling of WM_MOVE and WM_WINDOWPOSCHANGED messages. Problem is that no matter how I try to resize the QTextEdit it seems it has a maximum height and cuts of text, even if I "propagate" I meant to trigger resize event in all the subwindows. resized. Viewed 4k times 5 . resizeRowsToContents) and my override of resizeRowsToContents looked like this: The next time Qt’s main event loop runs, it dispatches all posted events, with some optimization. Commented Dec 2, Sometimes these answers only come from the source code: SizeChanged. And yes you have to do this for every lib you want support for and even more if you pay for this support - I even don't need to write a bug report for a library we use when there is no simple, reproducible example attached so it can be There are two possible solution. The same applies to paint events: update() calls postEvent(), which eliminates flickering and increases speed by avoiding multiple repaints. PySide6. This 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. I'm not sure how to ask this, so, feel free to ask for more information. The only thing I could find from apple:. It is awesome and works well. In Safari on iPhone and iPad, the window size is set to the size of the screen (minus Safari user interface controls), and The solution is to call this->viewport()->repaint() or this->viewport()->update() from your QAbstractScrollArea derived class instead of just repaint() or update(). Are there any extraneous events that can trigger multiple resize events? void window::resizeEvent(QResizeEvent* ev) 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. 1 Reply Last reply Reply Quote 0 SGaist Lifetime Qt Champion last edited by Using Qt I create a QMainWindow and want to call a function AFTER the windows is shown. Without a proper event loop in that situation, the internal state of objects depending on event processing will not be updated. The small QWidget show a message every time QEvent::Enter, QEvent::Leave or QEvent::MouseMove is triggered. Which means that if I have more data below (which is longer in terms of counts of words), those words will be wrapped down (if the wordWrap property is set to true). Returns the viewport widget. 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 If you want just one event after the resize is finished, it's better to use RxJS with debounceTime: debounceTime: How to trigger the window resize event in JavaScript? 1115. When does a Qt widget get a paintEvent? 6. trigger('resize'); it only works when I run it from the browser console. Is there a better way to disable window resizin The problem in my case is, that if i e. zip](Uploading 100%) Nobody will ever ben able to see anything in that :) I could well be wrong, but I'm not sure you're supposed to postEvent on an existing event like this directly to another widget (event object ownership/deletion etc. 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. If there already is an update event in the queue for the given widget, the events get coalesced. QtCore. throttle, . 4,122 4 4 gold badges 35 35 silver Probably I didn't explain myself enough clearly. ). In addition, there are traces in the window when I decrease the height of the bottom rectangle. You can use the Graphics View framework, which is intended exactly for this kind of applications where custom/specific graphics and positioning have to be taken into account, A resize event is posted whenever the size of a widget changes. What I need is possible that is a way to intercept the window resize event. Other browsers will trigger the resize event many times while you're resizing. someWidget. I have added Probably I didn't explain myself enough clearly. Here's an example of it being reimplemented in Qt Quick Controls 2. If you do not wish to subclass to just get resize event control, you can installEventFilter. The QWidget appears, and has its origin set in the mouse down event of the QMainWindow. connect(self. You may just want to handle resize events for making your adjustments which would allow you to handle cases where the user manually stretches or shrinks the window (as well as when they maximize or restore). It doesn't need to resize the window, just tell the window that the WM has triggered a resize event. If it is running, just exit without painting - with each subsequent resize event, restart the timer for another 250 ms. What I need, is to somehow intercept event or signal, when columns (not whole widget) in VideoTableView get resized. – Frank Osterfeld. 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. The obvious approach would be to just emit a signal from the main window's Update: It looks like the internals of jQuery UI have changed dramatically since I answered this and firing the event no longer works. 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 A resize event is posted whenever the size of a widget changes. Documentation contributions included herein are the copyrights of their respective owners. Qt delivers events to widgets by calling specific event handler functions with instances of QEvent subclasses containing information about each event. 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? @SGaist said in QTextEdit resize on content change?. size – PySide6. - when the resize event is received, start the QTimer with a 250 ms timeout. Follow edited Jan 16, 2013 at 15:25. 0, 64 bit). I want qt; qtablewidget; or ask your own question. So for instance you could do this: Hello I'm looking for a simple way to resize the content of my body , something equivalent to what happens when the user hits Ctrl+ or Ctrl- , but I want to trigger it automatically based on the si @Christian-Ehrlicher Ok. 5. answered Jan 16, 2013 at 11:50 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; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company You can change the event to QEvent::MouseButtonPress or QEvent::MouseMove to trigger the other event handlers. In the below example, we define a custom widget class that inherits from QWidget. Not much you can do about it I'm afraid. dispatchEvent(new Event("resize")); If you have objects that resize on the page and they're not inside the window resize event to perform their task this won't touch those elements. the problem is not blocking/unblocking the signal - or when connecting the signal - but having an event which tells me WHEN doing it. Such changes can be programmatic, user interaction or propagated from your operating system. The weird thing is, my mouse move event will only get called if any mouse b Skip to main content. GrecKo. I was wondering either it is possible to cast an event when I press maximize button in my main window, or resize it? I was trying to find some refference about this but with no If the widget is visible when it is being resized, it receives a resize event (resizeEvent()) immediately. Qt docs suggests that every event posted with postEvent() that have accept() and ignore() methods can be propagated (meaning each QEvent subclass). All this can add a 1 or 2 frame latency so when Qt is painting it can have size or layout information from a frame or two before. Since I'm getting it fro I create a simple UI with Qt Designer and convert it to Python codes. If the widget is not currently visible, it is guaranteed to receive an After calling show, the resize event is called 2 times. Qt Widget Resize Event . Strange behaviour overriding QWidget::resizeEvent(QResizeEvent* event) 2. I tried setting layoutSizeConstraint to different values for the vertical layout, the QScrollArea as well as for the widget itself, because of QScrollArea my widget is always resized to a small size when shown for the first time, this is why I tried to add and When I resize my application window , the GUI gets stuck until I stop the resizing . Using custom events generally involves creating your own QEvent subclass, overriding customEvent() in the QObject class that will receive the event (often the main window class) and some code that "posts" the event from your thread to the receiver. Using QWidget::render() to draw widgets that draw other widgets (custom paintEvent) 0. This object contains information about the old and new size of the widget, as well as the self. This is the same as QWidget::size(). You could call from. I finally did some testing. I had the same issue once, the solution I chose was to (re)start a singleshot QTimer on each resize event, and only process the update after the timer interval elapsed. 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?. This function is automatically called whenever a QDialog (or any widget that inherits from When resizeEvent() is called, it is passed a QResizeEvent object as an argument. JavaFX width/height properties fire only once. If the widget is visible when it is being resized, it receives a resize event (resizeEvent()) immediately. h): Yes you should write this code to see if your problem can be reproduced or if there is something other which triggers your issue. Reply Quote 0. Use the QScrollArea::widget() function to retrieve the contents of the viewport widget. Widgets respond to events that are typically caused by user actions. Commented May 12, 2020 at 11:58. The event handler QWidget::resizeEvent() receives resize events. Oldest to Newest; Newest to Oldest; Most Votes; Reply. For more information see the Event System page. 39. Adding widgets to the layout, using addWidget, within the resizeEvent function is not a problem as it does not instantly trigger a drawing. The QCloseEvent class contains parameters that describe a close event. Strange behaviour overriding QWidget::resizeEvent(QResizeEvent* event) 4. QResizeEvent(newSize, oldSize)) This will trigger the resizeEvent method of the widget. Qt user resize event ends (stops) 1. Example 1: Handling Resize Event for a Custom Widget. The event handler QWidget::resizeEvent () receives resize events. Size fails, since it does not trigger then even unless the new size is actually different since that is what the Resize event is for :) Share. It is not guaranteed that the construction of I have a QLabel derived objects in a layout, in a centralWidget, in a QMainWindow. You could probably override QWidget::render() or similar and use scale on the supplied QPainter. I'm using python3 and pyqt4 and I want some code to run every time my QMainWindow is resized. Qt paint on a widget created by QT Designer. Then I tried to override the mousePressEvent function. The following invariant is preserved: at any given time, there can only be one update event for any particular widget in an event queue. I want to be able to trigger a resize via an event, preferably generically so it will cover all windows (not just VirtualBox). I want to trigger a custom function on the c++ side if the width property of my QQuickItem changes. ; When resizeEvent() is called, it is passed a QResizeEvent object as an Welcome to Qt Centre. can you help me find where the bug is coming from? I want to trigger the resize event by running this code: $(window). QLabel supports a subset of HTML (see setTextFormat). Modified 11 years, 11 months ago. I have a stacked widget & am using stylesheets to display background images on it. If you get another resizeEvent while the timer is still active, just restart it. After opening up dev tools, and modifying the width of container, resize callback does not get called. QResizeEvent. It is not guaranteed that the construction of That's the point, you don't need to check; because you're implementing the mouse events in the class, you'll only receive the mouse events for the relevant class instance. QTimer. See also QWidget::resize () and It is not guaranteed that the construction of a widget triggers a resize event. It is not guaranteed that the construction of I have a situation where a certain application (VirtualBox) doeesn't correctly resize windows on my tiled window manager. Trying to trigger the event via Control. In paintEvent always paint the current pixmap, and after The layout respects the sizeHint() and minimalSizeHint() of its children (not their size()). oldSize – PySide6. Hot Network Questions As a solo developer, how best to avoid underestimating the difficulty of my game due to knowledge/experience of it? necessary (and Qt takes good care to do so), so be sure that you are not implementing something in the wrong way. Is there a way to catch resize events for docks in Qt? I need to be able to detect when a dock is resized (and not only when its location or 'features' change). (I have code that chooses a font based on the QLabels "contentsRect") I expected their resizeEvent methods to be called when the bars are hidden and shown, but they are not. If you're still unsure please add the code you've tried, as an edit to @Wotan said in posting a resize event from a widget to another . Ask Question Asked 10 years, 4 months ago. ©2024 The Qt Company Ltd. Follow edited May 15, 2018 at 12:28. 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 According to what you say, I understand that you are erasing the lines you draw with the mouse, and that happens because you are placing an image with a white background and replacing the previous image in the resizeEvent method, what you must do is also copy the drawing. About; Products Qt user resize event ends (stops) 1. I'm developing a Qt Application and I'm trying to find a way to use QTextEdit as a label with long text without the scroll bar. I would do some testing with the data you are using. Probably I didn't explain myself enough clearly. resizeEvent(event) QtCore. Mouse events in Qt. Internet Explorer provides a resizeEnd event. So, I believe the observed/reported behavior is a bug which might be limited to the MS Windows specific part of Qt. Loading More Posts. QCloseEvent. I've implemented a bound sub-window class, catching the moveEvent in order to prevent the user from dragging the sub-window out of the MDI area. Detailed Description¶. More info is given in Qt documentation:. ; User interaction The user resizes the widget using the mouse or keyboard. I understand, I will add my check boxes in a different function and not during showEvent(). It's kind of hard to tell when resizing started/stopped, especially in a cross-platform way. But when I fire it from an element onclick it doesn't So I have an X window (that belongs to another process), and I want to trigger a resize event for that window, preferably without actually resizing it. Qt widget stops receiving paintevents. Painful :) I've attached a resize event listener on container div. ©2019 The Qt Company Ltd. The code above does not trigger it. The label does the resize like i want but it doesn't give the same html/css results. 8 (GCC 9. 12. Improve this answer. And yes you have to do this for every lib you want support for and even more if you pay for this support - I even don't need to write a bug report for a library we use when there is no simple, reproducible example attached so it can be Yes you should write this code to see if your problem can be reproduced or if there is something other which triggers your issue. Then, in the mouse move event of the QMainWindow, the geometry of the QWidget is set, such that it appears that the user is drawing a rectangle on top of the QMainWindow. Returns the new size of the widget. Resize events are sent to widgets that have been resized. Parent widget resizing The widget's parent widget resizes, causing the child widget to also resize. My override of resizeEvent is like this: def resizeEvent(self, event): super(). These Qt Core classes are used to create and handle events. resize) but resized is not a builtin I don't think you can easily do this. It is not guaranteed that the construction of Probably I didn't explain myself enough clearly. I put my project in copy : [0_1523539695854_TestResizeEvent. Qt Centre is a community site devoted to programming in C++ using the Qt framework. This is how I'm doing it: Detailed Description. In later sections we explored different ways the Qt Event System offers work with events doing the best possible to give you concrete examples to play with the concepts right away. : qMRMLSliceWidgetPrivate. Position of widgets is governed by the layout which does its work in resize event. 7,110 22 how to handle auto-resize of widgets when their content changes. Are there any extraneous events that can trigger multiple resize events? void window::resizeEvent(QResizeEvent* ev) Unsolved resizeEvent(QResizeEvent* event) is not getting triggered. It is not guaranteed that the construction of This is a reusable abstraction, so you don't have to handcode timeouts or keep track of global timeoutID's yourself. When a resize event is created, it's done using this system anyway so You can override the void QWidget::resizeEvent(QResizeEvent *event) and send a signal out of it: @ void MyMainWindow::resizeEvent (QResizeEvent *event) {// My signal emit Resize events are sent to widgets that have been resized. It's not fired if I don't call show or showMaximized(). Whenever your size hint changes, you should call updateGeometry() on your own widget to trigger an update of the layout where the widget is placed in. What am I missing? PS: I am not interested in window resize event, only in container div. How can I handle a button press event in Qt to do something like the (argc, argv); QPushButton *testButton = new QPushButton("Push me"); testButton->resize(100, 40); testButton->show however I do not seem to have any access to the function I want to trigger upon a button click. If for any reason you need maximizing the window cause raising the ResizeEnd event you can raise the event this way: I had a similar issue with Qt::QueuedConnection (event is queued automatically if the sender and the receiver belongs to different threads). 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 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. Qt creator: paintEvent of Qwidget. 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 The Qt doc. Also, the 'event' that needs to take place for the program to continue, is a USB event. Some classes support more than one actual event type. I am receiving network communication and the GUI updates based on the incoming network communication . Best way to find it out, is to For example, QResizeEvent adds size () and oldSize () to enable widgets to discover how their dimensions have been changed. For more details you can see the Qt documentation about Event filters. You can trigger the window resize event with $(window). About; Products Qt MouseMoveEvent only triggers with a mouse button press. This happens event based, meaning if you do a fast resize you will get less paint events than doing it slow. arg__1 – PySide6. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1. This is a very good answer. When a timer reaches a certain value I'd like to change the background image (& retain the active widgets on the page) on page 2 (named page2) of the stacked widget. Code below is triggered in resizeEvent reimplemented in VideoTableView. My first approach was to just resize the window twice, going back to the original size the second time, but I failed. 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. If you do find a way to receive these events, you would probably still want to check the actual window size before making your adjustments. The closeEvent method is only called for a top-level window when a close request is received, so it is not suitable for your use-case. ; Layout changes The widget's layout manager changes the widget's size. Therefore you create 50 labels with the same image. 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! I want to trigger the resize event by running this code: $(window). It overrides the resizeEvent() method to print the size of the widget whenever it's resized. Commented Jun 29, 2022 at 16:22. states clearly that QResizeEvent::size(). Each subwindow is supposed to resize itself when it gets the event. Think, that will do the job :> A resize event is posted whenever the size of a widget changes. debounce methods from lodash and underscore, so I will mention Ben Alman's throttle-debounce jQuery plugin which accomplishes what you're after. You can use it for way more then just window resizing ;) for example to debounce a submit button by passing a higher timeout parameter. Add a comment | 33 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). QtGui. However, when the application starts and show is called on the main window, this event is fired three times. I tried to trigger resize event in my angular application but it is not working. 3. , > > When building PyQt application, sometimes I want to manually trigger the > resize event, so as to fit the widgets, how can I do that? When the QTableView is resized I want the entire table to resize its row heights, for each row. The event handler resizeEvent() receives resize events. The problem with this is that even though I don't explicitly do any 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. h. SGaist Lifetime Qt Champion last edited by . #ifndef ASPECTRATIOPIXMAPLABEL_H #define ASPECTRATIOPIXMAPLABEL_H #include <QLabel> #include <QPixmap> #include <QResizeEvent> class AspectRatioPixmapLabel : public QLabel { Q_OBJECT public: explicit Parameters. 0 Based on Qt 5. It provides a way to perform custom actions or adjustments in response to the size change event. The next time Qt's main event loop runs, it dispatches all posted events, with some optimization. I would recommend that if you want to trigger a resize event, you do it using the postEvent mechanism. When any mouse button is pressed (and holded) outside of the small QWidget, and the mouse is moved on the top of this small QWidget (While holding), QEvent::MouseMove is not While QWidget::update() is a powerful tool for managing widget repaints in Qt, it can sometimes lead to unexpected behavior if not used correctly. QTableWidget column resize event. 2. Again from the source, A resize event is posted whenever the size of a widget changes. In Qt, events are objects, derived from the abstract QEvent class, that represent things that have happened either within an application or as a result of outside activity that the application needs to know about. However, the resize events of the children seem to trigger sooner than the resize event of the parent. Small example would look like (MainWindow. Qt Style Sheets also allow different settings depending on the hover state. This is the generated code : from PyQt5 import QtCore, QtGui, pyqt4 window resize event. Constructs a resize event with the new and old bool TupPaintAreaBase::viewportEvent(QEvent *event) { return QGraphicsView::viewportEvent(event); } If I just return "true" from this method, then I lost all the painting events of my app, but I can resize freely all the docks from the main window as it should be. 3 as published by the Free Software Foundation. See documentation: Events. It is not guaranteed that the construction of Detailed Description¶. How to get a signal when the widget size changes. Qt Development General and Desktop Width not correct in resizeEvent Width not correct in resizeEvent. But it bypasses QMainWindows::closeEvent(), which often triggers, directly or indirectly, some cleanup and Thanks for the hint - I used the EventFilter. Qt MouseMove event not being caught in eventFilter() 6. Qt will handle that for you. . In my ui I have a QScrollArea and inside of it I want to place a couple off QTextEdit widgets and I only want use scrolling inside QScrollArea. So it goes down by one pixel and back up. How should I do that? Skip to main content. And yes you have to do this for every lib you want support for and even more if you pay for this support - I even don't need to write a bug report for a library we use when there is no simple, reproducible example attached so it can be @coder2020 said in Resize rectangle with mouse 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 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 I call the function in the constructor void YourWidget::showEvent( QShowEvent* event ) { QWidget::showEvent( event ); //your code here } Share. In principle, a zero-to-X change would, a null-to-X change wouldn’t. 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. Ask Question Asked 11 years, 11 months ago. 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. I've override resizeEvent(QResizeEvent * /* SizeEvent */) in a custom widget and I'm wondering if I should call SizeEvent->accept() on the event or just let it pass along. window. For example, if there are several resize events, they are compressed into one. 11. Hi, @Meera-Hadid said in resizeEvent(QResizeEvent* event) is not getting triggered. So you should reimplement these two virtual methods and return the size you want to force. A resize event is posted whenever the size of a widget changes. The same applies to paint events: QWidget::update() calls postEvent(), which eliminates flickering and increases speed by avoiding multiple repaints. In general, events come from the underlying window system (spontaneous() returns true), but it is also possible to manually send events using I find absurd no one still has answered: it's a very simple question if you have developed qt framework, you know how resize event is propagated when user resizes window AND when they simply maximize it. the link monitoring DOM properties please updated it – phoenixstudio. QWidget * QAbstractScrollArea::viewport const. 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. I just want to trigger it when the MdiArea is resized – a resize event always also implies a trigger of a paint event thus you get it. 1 Reply Last reply Reply Quote 0 SGaist Lifetime Qt Champion last edited by Hello there, I was wondering either it is possible to cast an event when I press maximize button in my main window, or resize it? I was trying to find some refference about this but with no luck. Stack Overflow. Edit* It sends two events, with one actually decreasing height by 1 pixel, then the second event has the same dimensions as the old. Events can be received and handled by any instance of a QObject subclass, but they are especially relevant to widgets. I want them to resize whenever the statusBar, menuBar, or toolBar are hidden/shown. Since I'm using an HID class device, there is no way to set an event to happen without a wait loop. Yes you should write this code to see if your problem can be reproduced or if there is something other which triggers your issue. - once the user stops resizing, at most 250 ms later the update will trigger a repaint. Returns the old size of the widget. Resize event is triggering Qt repaint which then triggers native blit. I searched for any method to detect changing window size. Share. If I change showMaximized() to show() it will get fired 2 times instead of 3. Get single stage resize event when user releases left mouse button. It is not guaranteed that the construction of Internally, a call to update() results in posting an event to the event queue of the GUI thread. h: #pragma once #include <QDialog> class Dialog : public QDialog { Q_OBJECT public: Dialog(QWidget *parent = 0); ~Dialog(); void I have a labels with images added through the designer, and I want to handle their resize event. Yes had a look at that and subclassed QGraphicsItemGroup and also inherited from resizablehandlerect. oldSize ¶ Return type:. A guide to event handling in Qt. The latter ones vary depending on your OS type. minimumSizeHint()): see above; I also read in this thread, that before doing the mainWindow resize I the event loop needs to be run to recalculate the new sizes, so I inserted QCoreApplication::processEvents to do so, without any visible effect. But the resize events are posted very quickly. So I want a specific function to be called once they are resized. I put the tcp socket in a separate thread and emit signals to my window to update the GUI . Classes used to create and handle 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 Detailed Description#. In Qt with C++, I created a window with a small QWidget inside. If you tell us what you're needing it for, we could help you with that. 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; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company My application reimplements resizeEvent() on some of its widgets. g. It is not guaranteed that the construction of A resize event is posted whenever the size of a widget changes. If I remove this method from my class, the problem occurs anyway. It also is raised when the user moves a form. There are other great answers here that show how to use setTimeout and the . However, there are several signals that are emitted while the application is shutting down that you can connect to. I'd probably have a single-shot timer triggered by resizeEvent, that would render the image onto a QPixmap. with the way you already mentioned) A resize event is posted whenever the size of a widget changes. 0. window. Here are some common errors and troubleshooting tips: Infinite Recursion: Solution Ensure that update() is only called under specific conditions, such as when the widget's state changes or in response to external events. Be aware, anyway, that resizeEvent is called always when it's really necessary (and Qt takes good care to do so), so be sure that you are not implementing something in the wrong way. 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. Over 90 percent of questions asked here gets answered. You can easily verify this by compiling and executing this simple project: dialog. trigger("resize"); – Laurent. 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. Follow answered Feb 5, 2009 at 10:46. I would like something like this self. It seems that tableView->resizeColumnsToContents() will only resize all the columns based on data in current view. I wanted to override the paint event to trigger painting the handles but the paint event receives no signal at all. If Mouse events on windows decoration are managed by the underlying window system, this is why you can't catch them as you tried. I trace the behavior with breakpoint (see w Skip to main content. Size = Control. There's no direct way to fire the event anymore because the resizable plugin has been fundamentally changed. The SizeChanged event is raised by the OnSizeChanged(). resize(mainWindow. What is the difference between angular-route and angular-ui-router? Hot Network Questions mainWindow. aspectratiopixmaplabel. The second resize event dimensions are 1920x1080. Fabian Schmied Fabian Schmied. 2024-12-13. The solution that I propose is only to paint if the new size is bigger in some of its In a QWidget application, there are some parameters I change when the main window is resized, and I would like to use them in the resize events of some individual elements. This then triggers my resizeEvent() call which resets the column widths to the percentage defaults. QTableView column width adjustable. ombd oopig fhjffb xmij qpqek vdvna vqiokw kfi ivfyrh raqigo