Qmainwindow resize event. [override virtual protected] void QSizeGrip:: mousePressEvent (QMouseEvent * event) Reimplements: QWidget::mousePressEvent (QMouseEvent *event). Example Code Using QMainWindow is straightforward. const QSize &QResizeEvent:: oldSize () const Returns the old size of the widget. This event is what causes resizeEvent () to be called. If the position is left uninitialized, then the platform window will allow the windowing system to position the window. When resizeEvent () is called, the widget already has its new geometry. QtGui. A main window provides a framework for building an application’s user interface. Note that due to asynchronous event handling, especially on Linux platforms, the order of resize events can change and some can even be triggered twice. window. " And when I restructure my app constructor to call setCentralWidget (&myglwidget_) the code compiles and runs but no OpenGL window appears. 5w次，点赞24次，收藏158次。本文介绍如何在Qt中使界面控件随窗口大小变化而自动调整，通过重写resizeEvent函数并使用不同方法获取窗口大小，实现MatlabCommandWindow控件与窗口的同步缩放。探讨了frameGeometry (), geometry ()及控件自身大小获取方式的优缺点。 If you use a QMainWindow the best practice will be to use a QMdiArea for handling internal windows. Exactly what manipulation causes the effect you see? Does Windows allow you to drag beyond screen edge during resize (taking the icons with it)? Does the window then get constrained to the screen without a resize event bringing the icons back into the smaller size perhaps? Does the behaviour change QResizeEvent 是 Qt 中一个非常重要的事件类，它在窗口部件（Widget）被重新调整大小时触发。理解和正确处理这个事件对于创建响应式（Responsive）的用户界面至关重要。当一个 QWidget 的尺寸发生变化时，Qt 就会发送一个 QResizeEvent 给该部件。您可以在部件的 resizeEvent(QResizeEvent *event) 函数中处理这个事件。 I have a QMainWindow and a QDockWidget nested inside this. resize) but resized is not a builtin 3 You can reimplement QMainWindow::event() to resize the window automatically whenever the size of the central widget changes: Example of how to implement the resize event for a "QMainWindow" class in PyQt - god233012yamil/PyQt-QMainWindow-Resize-Event-Example This code shows how to implement the resize event for a "QMainWindow" class in PyQt. A main window provides a framework for building an application's user interface. QMainWindow centralWidget contains essentially a QTableView (inside a QGroupBox). [SOLVED] Handling maximise/un-maximise events using QMainWindow::changeEvent General and Desktop 4 Posts 2 Posters 7. My aim is to resize the whole QMainWindow to fit contents snugly. 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. In order to perform custom handling of the event, you'll need to create your own resize event handler. ) Straightforward connecting a slot to a resizeEvent is not what I need, as while resizing the QMainWindow many of these events are emitted. 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 Lots of other posts are not explicit enough, e. This code seems to work correctly vertically (almost correctly: I didn't find a way to shrink table beyond a certain limit), but horizontally cuts table roughly in half. This is what I get:. I am trying to implement a QMainWindow with centralWidget and dockWidget. After hiding the widgets I can manually resize the window to its smaller size but I need this to be automatic. 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. 6 The child-parent hierarchy is the following: mainWindow -> centralWidget -> frame -> widget. connect(self. QResizeEvent ¶ class QResizeEvent ¶ The QResizeEvent class contains event parameters for resize events. Long story: Of course, I tried it myself. I Detailed Description # Resize events are sent to widgets that have been resized. This is the same as QWidget::size (). 使用QPainter绘图，resizeEvent 事件中调用update ()函数，会自动触发 paintEvent (QPaintEvent *event)方法。 1、resize函数 在Qt中，resize () 函数用于设置窗口或控件的大小。 它是 QWidget 类的一个成员函数，用来动态地改变窗口或控件的大小。 1、概述 QResizeEvent是 Qt 框架中用于处理窗口或控件大小变化事件的一个类。当用户调整窗口或控件的尺寸时，Qt会生成一个QResizeEvent事件，并将其发送到相应的窗口或控件。开发者可以通过重载窗口或控件的 resizeEvent() 方法来响应这个事件，并执行相应的操作，如调整布局、更新视图等。 2、重要 始终记住一点：要改变一个Widget的大小，只有move ()、resize ()、setGeometry ()这3个东西可用，当然，对于带装饰器的顶级窗口，你还可以通过鼠标等改变大小或移动窗口位置 (但这个 But you should consider that the minimum size is not computed until some events are processed in the event loop. I would like something like this self. 1k次，点赞11次，收藏17次。本文介绍如何在Qt中创建一个窗口，当其大小改变时，能根据新尺寸动态调整 QLabel 显示的图像大小，通过 resizeEvent 函数实现图片缩放。 In principle, a zero-to-X change would, a null-to-X change wouldn’t. setWindowState(Qt. 文章浏览阅读3k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。QResizeEvent在用户界面中帮助你更好地管理控件的大小变化，实现交互式和响应式的应用 在上面的示例中，我们创建了一个 QMainWindow 对象 window，并通过调用 show 方法显示了窗口。 然后，我们使用 resize 方法将窗口的大小设置为800×600像素。 总结 本文介绍了PyQt4中的窗口调整大小事件，并示范了如何捕捉并处理这些事件。 学习Qt界面开发技巧：详解如何让控件随窗口大小变化自动调整，分享resizeEvent事件处理方法和三种获取窗口尺寸的方式，包含frameGeometry()、geometry()和控件size()的对比分析，帮助开发者实现最佳UI适配效果。 在Qt中我们有时需要让一个控件在窗口居中或是在父控件中居中，而且在窗口拉伸时仍然保持正中央的位置。这里介绍一种方法，用到了主窗口的响应函数resizeEvent(QResizeEvent* event)，这个响应函数在窗口的大小改变时会自动调用，该函数如下：void MainWindow::resi How do I set the size of qmainwindow so it's exactly the size I want it to be and resizable? Also I don't want it to be set to a minimum or a maximum size. WindowMaximized) snooze(1) test hi all, i added a new widget to the top toolbar of the slicer mainwindow, now i wish it have a maximum width equal to the width of the main window, no matter how i resize the mainwindow. Hi everyone I am new with PyQt, I've been trying to resize all widgets when i click Maximize And when i click it, size of the widgets don't change. If you use a simple QWidget, just apply one of the layouts (for example QVBoxLayout) and you will be sure that everything will be look perfect. The event handler resizeEvent() receives resize events. Qt window resize event after resize is done Asked 6 years, 7 months ago Modified 6 years, 7 months ago Viewed 3k times Why does MainWindow::restoreGeometry () work in the constructor before the first QMainWindow::show () and yet after that neither MainWindow::restoreGeometry (), nor QMainWindow::resize (), nor any other way of trying to set the size, I have tried so far, work correctly. In your case, you would need to create a class that derives from QMainWindow and reimplement the resizeEvent function. To add a menu bar to the main window, create the menus, and add them to the main window's menu bar. g. This often causes recursion problems or looks strange because the widget resizes in ways the user has not requested. So my question is: what was this and how to distinguish "right" event from the "wrong" one? PySide6. This means you can resize your main window by simply doing: I would like to know how to block/filter the vertical and horizontal resize events and call the resizeEvent() when the user try to resize the QMainWindow using the window corner (Image below). To do that I currently have to do this. The mouse press event is passed in the event parameter. what i want to do is handle the resize event of the mainwindow, and set the width of the widget in the event handler, any better ideas to implement this? mainWindow. when } MainWindow::~MainWindow (). const QSize &QResizeEvent:: size () const Returns the new size of the widget. I want the QMainWindow to resize based on that - to have a minimum size that is needed to display all the widgets. I read I need some C++ code to trigger ONLY if/when the user maximizes or de-maximizes (floats) a QMainWindow. I cannot get this to fail on Linux, though I assume from the screenshot that you are on Windows. QT窗口尺寸，窗口大小和大小改变引起的事件 QResizeEvent。 The most common way to attempt this is to call resize from within the resize event. { delete ui; delete mainLayout; delete label1; delete label2; } void MainWindow::resizeEvent (QResizeEvent *event). QMainWindow has its own layout to which you can add QToolBars, QDockWidgets, a QMenuBar, and a QStatusBar. To capture the resize event of a QMainWindow class, the method resizeEvent() method must be overrrided. { QMainWindow::resizeEvent (event); int newWidth = event->size (). The QWidget class is the base class of all user interface objects. So, how can i make a QMainWindow resize to QDockWidget size every time? Qt has QMainWindow and its related classes for main window management. Qt has QMainWindow and its related classes for main window management. The resize event is called whenever the window is resized in the windowing system, either directly through the Short story: I need to resize a QMainWindow on certain event, so I cannot use static setup of min/max sizes and size policies. Initial Geometry If the window's width and height are left uninitialized, the window will get a reasonable default geometry from the platform window. Generally, you subclass QMainWindow and set up menus, toolbars, and dock widgets inside the QMainWindow constructor. There are a number of tasks that I want to execute if the window size changes, is there a way to execute code when that happens? I've read some stuff on QRes Lifetime Qt Champion wrote on 4 Apr 2020, 11:26 #9 @ tomy said in QMainWindow auto resize: while the output window we create using it ultimately is very simple: But it's still a widget what you want to show - so yes you must derive from QWidget and there is also no way around it (and also no need for it). 7k Views 1 Watching and 2 times form the main event loop, providing 100x200 and then 1280x971 (actual size). height (); // 计算每个标签的新高度，使它们平分窗口高度。 int labelHeight = newHeight / 2; label1->resize (newWidth I would like to perform an action after I resize a QMainWindow (dragging the mouseafter cloicking the border or a cornerpoint. , using setGeometry () or resize ()), Qt sends a special QResizeEvent to that widget. Details PyQt PyQt4 窗口大小调整事件 在本文中，我们将介绍如何使用PyQt4处理窗口大小调整事件。窗口大小调整事件在GUI应用程序中经常使用，它可以让我们控制当用户调整窗口大小时应采取的动作。 阅读更多：PyQt 教程 PyQt4 简介 PyQt是一个Python绑定Qt库的框架，它允许我们使用Python语言创建丰富的图形用户 I am trying to maximize my main qt window upon running and prevent the user from resizing it. Your code would look something like this: Constructs a resize event with the new and old widget sizes, size and oldSize respectively. e. resized. Oct 10, 2012 · There is a resize event. This doesn't have any effect: calling resize () on QMainWindow and/or it's central widgwt creating own QResizeEvent and calling resizeEvent () on window 文章浏览阅读6. I have tried int main (int argc, char *argv []) { QApplication a (argc, argv); MainWindow widget The QResizeEvent class contains event parameters for resize events. QMainWindow has its own layout to which you can add QToolBar s, QDockWidget s, a QMenuBar , and a QStatusBar . This code shows how to implement the resize event for a "QMainWindow" class in PyQt. width (); int newHeight = event->size (). What I need is possible that is a way to intercept the window resize event. The program will still run without this extra code if need be but having this feature would definitely help aesthetics. 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 r The window will always get a resize event before the first expose event. The Main WIndow is resizable. Can anyone help me understand this behavior? actionToggleLogWindow status is not checked by default. When the user resize the dock widget I want resizeEvent to be called for the dock widget and some values to be returned. I only want to do the action once, only after the 'last resizeEvent'. The mouse move event is passed in the event parameter. How do I resize the contents of the window automatically, the font and everything, i. I have tried removing the lower widget (s) from the layout. The issue is that myglwidget doesn't get any of the resize events when the main window is resized, even if I set the widget size properties to "expanding. Best way to find it out, is to install an eventFilter on your object, listen to the resize event and qDebug the result. The resize event is called whenever the window is resized in the windowing system, either directly through the windowing system acknowledging a setGeometry () or resize () request, or indirectly through the user resizing the window manually. Widget is being resized during the application lifetime, however it is always set to a fixed size. The resize event is called whenever the window is resized in the windowing system, either directly through the I'm using python3 and pyqt4 and I want some code to run every time my QMainWindow is resized. I have a QMainWIndow with several widgets, one of which is a QTableView. resize(mainWindow. None of these resize the window to the new minimum dimensions, instead acting as if the hidden widgets are still there. The layout has a center area that can be occupied by any kind of widget. log("Maximizing") o. def main(): startApplication("addressbook") o = waitForObject({"type": "MainWindow"}) test. Receives the mouse press events for the widget, and primes the resize operation. You can see an ima Sep 11, 2025 · When a user resizes your window or when you programmatically change a widget's size (e. Discover how to manage resize events in your PyQt applications with this informative guide. I 文章浏览阅读9. To capture the resize event of a QMainWindow class, the method resizeEvent () method must be overrrided. 以下内容是CSDN社区关于QT问题：如何在QMainWindow大小改变事件，我需要在大小改变时调用一个函数相关内容，如果想了解更多关于工具平台和程序库社区其他内容，请访问CSDN社区。 So your MyForm subclass passes self (an instance of QMainWindow) to setupUi, which then becomes the MainWindow variable you see in your ui file. So when the number of buttons are changed, just process the event loop for some iterations and then resize to minimum. g "use sizePolicy" or "use frameGeometry " or "use geometry" or "use sizeHint ". sizeHint()): see above mainWindow. I show some graphs, so the QDockWidget expands but the QMainWindow keeps it's initial size so i have to resize it using my mouse. This event handler can be reimplemented in a subclass to receive widget resize events which are passed in the event parameter. When I restore the mainwindow manually by clicking the restore button on the right top corner, the resize function works. You can see an image of the layout below. x0zx, xva5l, n1eoh, shfe3x, s2vx7, i9mhj, 4jr4n, epyo, ncjvjr, dqorb,