![pyqt keep all windows on top pyqt keep all windows on top](https://i.stack.imgur.com/uzFOI.png)
We need to keep track of the mirrored state so that we can keep the user interface in sync, as we will see when we discuss the mirroring actions. PyQt provides various mirroring capabilities, but for this example application we have limited ourselves to just three possibilities: having the image mirrored vertically, horizontally, or not at all. The filename is initially set to None, which we use to signify that either there is no image, or there is a newly created image that has never been saved. We use dirty as a Boolean flag to indicate whether the image has unsaved changes. A QImage is not a QObject subclass, so it does not need a parent instead, we can leave its deletion to Python's normal garbage collection when the application terminates. Next, we create a null QImage that we will use to hold the image the user loads or creates. The initializer begins conventionally with the super() call. Self.image = QImage() self.dirty = False self.filename = None self.mirroredvertically = False self.mirroredhorizontally = False
![pyqt keep all windows on top pyqt keep all windows on top](https://user-images.githubusercontent.com/46163555/88705707-e6fe5980-d0dd-11ea-8fcc-bc024298705d.jpg)
![pyqt keep all windows on top pyqt keep all windows on top](https://www.askpython.com/wp-content/uploads/2020/08/PyQt5.png)
Now we can look at the beginning of the MainWindow class. It is common for applications to have a version string, and conventional to call it_version_ we will use it in the application's about box. We will discuss the qrc_resources module later on. The helpform and newimagedlg modules provide the HelpForm and NewlmageDlg classes. The sys module is used to provide sys.argv as usual. We will discuss the items we use from the os and platform modules when we use them in the code. In this book, the practice is to import Python's standard modules, then third-party modules (such as PyQt), and then our own modules. Import os import platform import sys from PyQt4.QtCore import * from PyQt4.QtGui import * import helpform import newimagedlg import qrc_resources But first we will look at the imports that precede the class definition. The initializer is quite long, so we will look at it in pieces. The application's main window class is in the file chap06/imagechanger.pyw. The files that make up the Image Changer application are shown in Figure 6.2. User's workspace, to load the files that the application had open when it was last terminated. It is quite common to also read in the application's settings, and for applications that restore the Figure 6.2 The Image Changer's modules, classes, and functions Next, we create "actions" and insert them into menus and toolbars.
![pyqt keep all windows on top pyqt keep all windows on top](https://thumbs.gfycat.com/WiltedFavorableGoldfish-mobile.jpg)
We begin by creating and initializing some data structures, then we create a "central widget" which will occupy the main window's central area, and then we create and set up any dock windows.
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If you have any problems with the registration process or your account login, please contact us.For most main-window-style applications, the creation of the main window follows a similar pattern.
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