How do I make a newly created window in wxPython not take focus? I'd like to be able to create a new window, without focus jumping to it.
I've never tried it, but I've heard you can do
window.Disable()
window.Show()
window.Enable()
That seems a little counter-intuitive. However, you can also simulate this by creating and showing the second frame and then calling Raise() on the original frame.
Related
I'm working with opencv3, python 3 and pyqt5. I want to make a simple GUI in which I want open up a new window to play a video along with some other widgets when a button is clicked on the main window. I've used QPixmap for displaying images in the past so I create a label and try to set the frames in the pixmap in a loop. The loop works fine but I am unable to get a display of the video/new window.
The loop I want to execute in the new window looks something like this:
def setupUi():
vid=cv2.VideoCapture('file')
ret, frame=vid.read()
while ret:
Qimg=convert(frame)
self.label.setpixmap(Qimg)
self.label.update()
ret,frame=vid.read()
convert() is a function I've written myself that converts the cv frame to QImage type to be set into the pixmap.
I'm only a beginner with pyQt so don't know what I am doing wrong. I've read about using signals, threads for the new window and QtApplication.processEvents() but don't know how these work and how they'll fit into my problem.
It would be helpful if someone could set me in the right direction and also point out some resources to create good interfaces for my apps using OpenCV and python.
The reason that this isn't running is that your while loop is blocking Qt's event loop. Basically, you're stuck in the while loop and you never give control back to Qt to redraw the screen.
Your update() call isn't doing what you think it is; it's updating the data stored by the object, but this change does not show up until the program reenters the eventloop.
There are probably multiple ways of handling this, but I see two good options, the first being easier to implement:
1) Call QApplication.processEvents() in every iteration of your while loop. This forces Qt to update the GUI. This will be much more simple to implement than 2).
2) Move the function to a separate class and use QThread combined with moveToThread() to update the data, and communicate with the GUI thread using signals/slots. This will require restructuring your code a bit, but this might be good for your code overall. Right now the code that is generating the data is in your MainWindow class presumably, while the two should be kept separate according to Qt's Model-View design pattern. Not very important for a small one-off app, but will help keep your code base intelligible as your app grows in size.
I am currently working on a project using Python and tkinter.
The problem is that I don't know what's the proper way to display multiple windows, or screens, I don't know how to call them. Let me explain better.
When the application starts the login screen appears. After that, if I click register, I want to go to the register screen, but I don't want it to be a separate window (I don't want to have 2 windows displayed at the same time), but rather another window with different content ?!
How should I handle properly this situation? Create a second window using Toplevel and hiding the first (can I do that?) or changing the widgets of the first?
Code I've written so far
You can do that- just call window.withdraw() on the Toplevel you need to hide after creating a new Toplevel. Changing the widgets in the first is also an option- if you like, you could always try a Notebook widget and disable manual flipping or just put each "screen" in a frame and grid_ or pack_forget them to remove them from the window.
I have a problem in which I update StaticText fairly often(once every second) and every time it updates, it tears the frame. This is very bothersome on Windows but on Linux it never happened. I tried doing TextCtrl Readonly but I get ugly boxes around text I was wondering if there was a better option for updating text in wxPython frequently that wouldn't tear the screen. Thanks in advance!
I wish I understood better what you meant by "tearing" the frame - I don't seem to have problems with changing StaticText values after a window is created (though sometimes it's necessary to call Layout on a Panel or Dialog).
However, if you're really just looking for read-only TextCtrl's without the "ugly boxes" you should use TextCtrl(style = wx.NO_BORDER | wx.TE_READONLY). The combination will give you what you want - what appears to be a StaticText, but that can't be user-edited and doesn't display a border. You'll also be able to select its value (which may or may not be an advantage).
Pressing command-H in OSX immediately hides the active window. How do I achieve the same effect, programmatically, from Python? Specifically, I'd like to find a particular window that my application creates and then be able to show & hide it programmatically.
I already know how to do this with pywin32 but I'm afraid my expertise there doesn't quite cover OSX as well.
If it helps, the window in question is one created by pygame. I know that pygame has pygame.display.iconify() but that doesn't satisfy my requirements - the window doesn't disappear immediately, but rather the disappearance is animated, and there's no corresponding "uniconify" function that I can find.
Well, this ended up working. When I want to hide the window, I do pygame.display.quit() and make my code properly handle not having a display. When I want to show it, I do pygame.display.set_mode(...) with the former resolution.
The net effect is that of hiding & showing the window. Unfortunately the window gets created in a different spot than where it started, and although apparently you can tell SDL to create the window in a particular spot, I haven't been able to find a way to get the window's location...
I managed to get it working on Win32 (inheriting from wx.MiniFrame does the trick), on wxGTK (wx.PopupWindow) but whatever I try, when I create a frame on wxMac, my main window loses focus and the new frame gets it.
wxMac does not seem to have a way to interact with the native platform (something like GetHandle() on Win32 and GetGTKWidget() on wxGTK), so I can't hack around it this way.
I managed to get this working in another situation, by creating the frame at startup and moving it outside of the display area, then moving it in a visible position when needed. But right now this would be cumbersome because I don't know in advance how many frames I will need.
So, any simpler way to do this ?
If you want to get native handle to window in Mac you can do
frame.MacGetTopLevelWindowRef()
and may be you can use pyobjc to interact with windows natively, but why don't you set focus on the window you want to after opening mini-frame?