z-reader | vscode plugin ] novel reader | Media library
kandi X-RAY | z-reader Summary
kandi X-RAY | z-reader Summary
📘 [vscode plugin] novel reader, supports online search and local reading, supports txt and epub formats
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QUESTION
I haven't used C++ in ages. Between what I've forgotten and what has changed in C++ over time, I'm really banging my head against the wall trying to do something that would be trivially easy in JavaScript, or any other language where functions are objects, and not just simple pointers.
I think I understand the basic problem: A class member function only exists in once place in memory (there isn't a different copy of it for each class instance). The only way the function knows what "this" is is because an instance pointer is passed along as an invisible first argument to every function call. A plain-old C-style callback isn't going to know anything about passing that instance pointer.
What I need is a new function that is somehow bound to my class instance, one which knows how to pass "this" along to the member function. That's the function I need to use as a callback.
But I don't know for sure how to dynamically create such a function. I think the code below is on the right track (except for casting pointer types), but it does bother me a bit because it seems like that there'd have to be some dynamic memory allocation going on, and if so, some way to track that allocation and do clean-up later.
...ANSWER
Answered 2020-Jan-28 at 21:19This is a far from ideal solution (I'm beginning to think there are no ideal solutions here), but it works for me in this particular case where there aren't likely to be very many instances of my SignalMonitor
class in use at the same time.
First, I turned my signalHasChanged
class method into a static method that takes an instance as an argument. (I could have kept the method as a class method by going through some hairy type-casting, but it wasn't worth it.)
Then I made ten almost-identical indirect callback functions:
QUESTION
How to implement this complex view in the flutter?
I am trying to implement a GridView
with n columns and the child should be of a certain aspect ratio(say 1.3) but the height of the child should be (wrap content in Android terminology).
I am stuck because as fas I understand GridView's childAspectRatio:1.3
(default:1) always lays out the child in same aspect ratio but not dynamic content.
Note: Child should expand its height according to the image's height
Use case: I am trying to implement a view like below, in which image is wrapped height = wrap content
so that in case an image with stretched height can look good and form a StaggeredGridView
like structure.
ANSWER
Answered 2018-Apr-11 at 18:35There are two things here:
There is an existing package for doing such layout
In order to make the images look good use
BoxFit.cover
on theDecorationImage
widget.
There are tons of example in the package repo here
I just used on of the examples and modified it to include pictures:
QUESTION
I am facing a strange problem in my material design app . Some thumbnails are opening and loading details activity as expected , but some are not opening instead there is crash happening . in this video u can see the problem I am facing . I am attaching the link to my project ZIP file link with this ,My Project
this is the main activity ....
...ANSWER
Answered 2018-Aug-09 at 17:10Maximum Parcelable size should not be exceed 1mb. In you app it is 2.1 Mb. Without passing app date to the next activity you can try to pass item id and load data in next activity. Otherwise you can cache the list data and you can load the data from the local database in the details activity. If you cannot see crash log in android studio it because it set as "show only selected activity". In this case app get close and then this type of logs doesnot show in the android studio. switch that to No Filter and you can see the all logs.
QUESTION
I am trying to use the up navigation in my app. The up navigation button displays, but sometimes it works and sometimes it does not. The app can be viewed here XYZReader on GitHub
Desired behaviourThe main activity displays a grid of cards. When you choose a card a detail activity displays the article. The detail activity uses fragments and view pager so that one can swipe right/left to the next/previous article.
In the (collapsing) toolbar of a fragment the up/back navigation button displays, and when I click on the button I want to go back to main activity.
I choose an article from the grid in the main activity, and the detail activity displays the corresponding fragment.
I click on the up navigation button and nothing happens.
I would like the up navigation to bring me back to main activity to see the grid list of articles.
I choose an article from the grid in the main activity, and the detail activity displays the corresponding fragment.
I swipe to the right to see the next article. Then I click on the up navigation button and I go back to the main activity to see the grid list of articles.
activity_article_detail.xml
is the layout of the host/detail activity. It merely contains a view pager view:
ANSWER
Answered 2018-Jul-14 at 19:44The issue is that I tried to set the support action bar of the host activity for each fragment, which is wrong (I cannot believe I really did that).
I just use the toolbar, set the navigation icon and a corresponding listener:
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