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QUESTION
Iam using EventChannel to handle events from hardware barcode scanner. EventChannel is initialized in initState, in main class - it works through whole app. While change is detected, it inserts value into global variable (ValueNotifier - i dont know, if it is right) and then I need to work with that value in multiple widgets. I need some sort of widget, which will tell me, that value updated and it will trigger onEvent function - something like RawKeyboardListener. I tried using listeners, but when i do pushNamed, the listener is still listening and it runs code from previous pages, while scanning.
Is there any widget, that would be suitable for me? (cant use ValueListenableBuilder, because it has no "onEvent" function) Or is there any way, to remove and add listeners while moving between pages, or while modal bottom sheet is opened? (I need to access previous listeners, after Navigator.pop)
...ANSWER
Answered 2021-Jun-14 at 10:37I solved my problem by using listeners and ModalRoute.of(context).isCurrent.
QUESTION
A part of my form contains QGroupBox
(Status Box
) with 4 child QGroupBox
es arranged in a grid layout (2x2). Two bottom QGroupBox
es (Widget 1 Box
and Widget 2 Box
) contain widgets of fixed size (with set minimumSize
and maximumSize
) so they're non-resizable at all in both directions. Because of that rigid size constraints top row of QGroupBox
es (Summary Box
and Helper Box
) can only be resized in vertical direction.
And here comes the troublesome part. Top-left QGroupBox
(Summary Box
) have grid layout 5x3 while top-right (Helper Box
) have vertical layout with 6 rows. If I have naive widget placement as shown on picture 1 Qt is enlarging vertical size of both labels in top row to make height of both QGroupBox
es equal (see red arrows on picture 1).
This is definitely that I don't want so I've added vertical spacer to the bottom of Summary Box
and from the first glance it worked (picture 2). But only from the first glance... What you see is the minimum height of my whole form and the bottom side of spacer and last QCheckBox
in the Helper Box
seems to be aligned.
If I'm expanding my form vertically this spacer grows a bit and that causes the increase of height of both top QGroupBox
es. As a result spacing between QCheckBox
es increases too and we can also see that top and bottom spacing are unequal for the top-right box (see red arrows on picture 3).
I've tried to play with sizeType
for my vertical spacer. If I set it to Minimum
or MinimumExpanding
then the spacer doesn't grow on resize (and doesn't shrink, too) but it appears to be expanded to the size as on picture 3 (corrupting spacings between QCheckBox
es too). If I set it to Maximum
, Preferred
or Expanding
then I observe the same behavior as described above for picture 3.
What is the proper way to achieve alignment for two QGroupBox
es in a row of grid without affecting spacing between elements (e. g. in that case make vertical spacer to fit only single row of grid layout and never expand/shrink)?
ANSWER
Answered 2021-Jun-15 at 17:18Items will be aligned if both QGroupBox
es have same count of children and each row have at least one child with Expanding
vertical policy. Instead of spacer use QWidget
I removed unrelated widgets and reduces number of rows to 4 for demonstration purposes (less xml).
QUESTION
I've started to create UI tests for my PyQt5 widgets using QtTest but have run into the following difficulties:
In order to speed up things, some of my widgets only perform operations when visible. As it seems that QtTest runs with invisible widgets, the corresponding tests fail.
For the same reason, I cannot test program logic that makes a subwidget visible under certain conditions.
Is there a way to make widgets visible during test? Is this good practice (e.g. w.r.t. CI test on GitHub) and is QtTest the way to go?
I have tried to use pytest with pytest-qt without success as I couldn't find a proper introduction or tutorial and I do know "Test PyQt GUIs with QTest and unittest".
Below you find a MWE consisting of a widget mwe_qt_widget.MyWidget
with a combobox, a pushbutton and a label that gets updated by the other two subwidgets:
ANSWER
Answered 2021-Jun-15 at 17:01The problem is simple: QWidgets are hidden by default so isVisible() will return false, the solution is to invoke the show() method in init() to make it visible:
QUESTION
My problem is that, I have a List of Icons(CustomWidgets) what are provide by an API. I need put this icons in my App but when the are 7 or more its looks like these:
I want to put the icons in separate rows. I've tried out a method which split the list in 2 and add it dynamically but didn't print anything because I'm using a FutureBuilder to print the Icons.
Here is the code:
...ANSWER
Answered 2021-Apr-16 at 01:34What I suggest is to use Wrap instead of Row in your case, widget will place in the 2nd row is not enough space
THERE IS THE WAY TO DO IT:
QUESTION
ANSWER
Answered 2021-Jun-15 at 11:40item
here is a Map
.
QUESTION
I am trying to stylize my form using bootstrap. As you know bootstrap uses a lot of classes in order to do what it does. By googling I have found to inject some new classes into my form I could use widgets with django. My form is as follows:
...ANSWER
Answered 2021-Jun-15 at 10:09Meta.widgets
only applies to the automatically created form fields. If you are manually creating some of them, you need to specify your widgets there.
QUESTION
I am trying to understand how JavaRx's Flux.merge and switchIfEmpty work together in regards to the below code as I am a bit confused on results I am seeing which is no doubt the result of my not fully grasping Java RX.
My question is ... If the call to wOneRepository... returns an empty list or the call to wTwoRepository... returns an empty list, will the switchIfEmpty code get executed? Or will it only get executed if both calls return an empty list?
...ANSWER
Answered 2021-Jun-14 at 14:30switchIfEmpty()
will only be called if the upstream Flux
completes without emitting anything, and that will only happen if both f1
and f2
complete without emitting anything. So, if both findWidget
calls fail, or both return empty Flux
instances, or some combination of those, then switchIfEmpty
will be called. If either f1
or f2
emits a Widget
, then that Widget
will be emitted from the merge
operator, which means switchIfEmpty
will not be called.
QUESTION
In PageViewBuilder, instead of swipe gesture I want to move to the next page using onTap on an ArgonTimerButton which I found on pub.dev. I created a controller and used controller.nextPage() but it gives me this error:
...ANSWER
Answered 2021-Jun-15 at 08:10You are creating the controller but you are not using it.
Instead of :
QUESTION
I am trying to add api response data into datatable row.
My api response is look like this
...ANSWER
Answered 2021-Jun-15 at 06:28You should use the FutureBuilder
widget to update your user interface when the data is available. The code you provided attempts to build the widgets before the data is received. This causes the _historyList
to still be null.
QUESTION
ANSWER
Answered 2021-Jun-15 at 04:56Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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