Hi Sean,
AFAIK, the easiest way to trap keyPress/keyRelease irrespective of which
widget has the focus is to install an event filter on the QApplication
instance. Use the mouseEnter/Leave events of the thumbnails to
set/clear a currentThumbnail, and then in eventFilter only act on the
'm' keyPress if the currentThumbnail has been set, and return false from
the filter, otherwise return true so that the 'm' will go to the edit
box or whatever.
Regards, Tony
On 11/07/2019 9:53 pm, Murphy, Sean wrote:
I'm trying to figure out the best way to receive key presses when the user
hovers over a specific widget, and deliver that keypress information to the
parent widget.
Say I've got three types of widgets:
1. thumbnailWidget - displays a low resolution version of a full resolution
image, essentially based on QLabel
2. imageLibraryWidget - displays 1-N image thumbnail widgets. This widget is
based on QWidget. Also owns all the full resolution images used to create the
thumbnails
3. magnifierWidget - popup widget that displays a full resolution subset of the
thumbnail. Think of it as just a magnifying glass that you can put over a
portion of the thumbnail
Application hierarchy is as follows:
- MainWindow
- multiple "other" widgets, some of which can receive keyboard focus
(QLineEdits, QTextEdits, etc.)
- one or more imageLibraryWidgets
- multiple "other" widgets, some of which can receive keyboard focus
- one or more imageThumbnailWidgets
- one magnifierWidget
So the way I want this to work is that when the user hovers over a thumbnail
widget AND presses a specific key, the imageLibraryWidget that is the parent of
that thumbnail is notified that the correct keypress has been received, and
knows which thumbnail (and which pixel of that thumbnail) the cursor is over.
It then will popup the magnifierWidget with the appropriate full resolution
pixels. When the user releases the key, or moves the mouse so they are no
longer over a thumbnail, the magnifier is hidden.
I've got the mouse position portion taken care of, but I'm struggling to get
the key press thing correct, especially given that other widgets (either child
widgets of the imageLibraryWidget or children of MainWindow) might have the
keyboard focus at the time the user moves the mouse over a thumbnail and
presses the bound key. I still want the magnifier idea to work, ideally without
changing the keyboard focus from the currently focused widget.
So the following should work:
1. User starts to type something in a line edit
2. Before finishing what they're typing they decide they need to double check
something in the related image
3. User move cursor over image, and presses the key bound to the magnifier
functionality. Let's say the key is 'm'
4. While over the image, and they are holding down the 'm' key, the keypress
should be consumed and not get entered into the line widget
That's the ideal case, I can live with it if the user would lose keyboard focus
in the line edit and has to click back in it after the above sequence if I have
to.
Thoughts about how to go about this? I think I might need some combination of
event filters and QHoverEvents, but not sure of the right combo at the moment.
Sean
This message has been scanned for malware by Forcepoint. www.forcepoint.com
_______________________________________________
Interest mailing list
[email protected]
https://lists.qt-project.org/listinfo/interest
_______________________________________________
Interest mailing list
[email protected]
https://lists.qt-project.org/listinfo/interest
