todomvc-flux-swarm | Flux applications have three major parts | iOS library
kandi X-RAY | todomvc-flux-swarm Summary
kandi X-RAY | todomvc-flux-swarm Summary
Flux applications have three major parts: the dispatcher, the stores, and the views (React components). These should not be confused with Model-View-Controller. Controllers do exist in a Flux application, but they are controller-views -- views often found at the top of the hierarchy that retrieve data from the stores and pass this data down to their children. Additionally, actions — dispatcher helper methods — are often used to support a semantic dispatcher API. It can be useful to think of them as a fourth part of the Flux update cycle. Flux eschews MVC in favor of a unidirectional data flow. When a user interacts with a React view, the view propagates an action through a central dispatcher, to the various stores that hold the application's data and business logic, which updates all of the views that are affected. This works especially well with React's declarative programming style, which allows the store to send updates without specifying how to transition views between states. We originally set out to deal correctly with derived data: for example, we wanted to show an unread count for message threads while another view showed a list of threads, with the unread ones highlighted. This was difficult to handle with MVC — marking a single thread as read would update the thread model, and then also need to update the unread count model. These dependencies and cascading updates often occur in a large MVC application, leading to a tangled weave of data flow and unpredictable results. Control is inverted with stores: the stores accept updates and reconcile them as appropriate, rather than depending on something external to update its data in a consistent way. Nothing outside the store has any insight into how it manages the data for its domain, helping to keep a clear separation of concerns. This also makes stores more testable than models, especially since stores have no direct setter methods like setAsRead(), but instead have only an input point for the payload, which is delivered through the dispatcher and originates with actions.
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QUESTION
so I'am trying to learn dart and flutter and everything went well so far. But now I'am stuck at an error which I cannot handle. I coded a function which is supposed to asynchronously return the actual BTC price from https://blockchain.info/ticker.
Only thing it returns is errors:
...ANSWER
Answered 2022-Mar-29 at 00:29To get rid of that error you need to use the bang operator to tell the compiler that snapshot.data
won't be null.
QUESTION
ANSWER
Answered 2022-Mar-19 at 06:15My suggestion is to use ion-footer.
QUESTION
Very new to react native and javascript... I am trying to call a function and it doesn't seem to do anything.
Here is the fragment of code where the function is called:
...ANSWER
Answered 2022-Feb-24 at 16:20You need to start your component with a capital letter:
Note: Always start component names with a capital letter.
so change renderButtons to RenderButtons
QUESTION
What I'm trying to do is make a counter in Flutter which will be in this shape:
I'm fairly new regarding flutter and dart so I have tried to put this element inside of a Card but yeah I faced some issues due to overflow and it would be great if someone could give me a hint or point me to the right direction.
Here is my code for counter:
...ANSWER
Answered 2022-Feb-09 at 20:19Create a container and add decoration to it. Then inside the container use a row widget. In row use Iconbutton and text .
QUESTION
I'm building an app where I have a page which gives information about a specific trading card. I want the page to be scrollable, but I also want to have a grid on the page, with each grid cell showing one data point. I made the grid using GridView.count().
My problem is that instead of have a page which I can scroll through, the top half of the page stays static, while the grid is scrollable. How do I make the grid static, while the rest of the page scrollable? I intend to have more data below this grid as well, and I want to user to be able to scroll to see all of it, with the grid being a static component of the page.
Here's my code:
...ANSWER
Answered 2022-Feb-06 at 09:47You can provide physics: NeverScrollableScrollPhysics()
on GridView
to disable scroll effect. If you want scrollable as secondary widget use primary: false,
To have Full Page scrollable, you can use body:SingleChildScrollView(..)
or better using body:CustomScrollView(..)
QUESTION
I am posting this question to help future readers. After upgrading to Flutter 2.8
I suddenly got this error when trying to run my app:
ANSWER
Answered 2021-Dec-26 at 14:20Turns out this error was caused by a popular library I used (settings_ui
) that does not work with this version of Flutter (settings_ui: ^1.0.0
).
For future readers: Use a later version of this package. There is currently an open issue on github that addresses this.
Update 2022: Dev on settings_ui seems to have gone AWOL and no longer merging PR's the community has forked this project to: https://pub.dev/packages/flutter_settings_ui and here updates are properly merged and a fix has been released in version 1.0.1
For people facing this issue now:
As a monkey patch you can follow the steps in the GitHub issue and edit the package files locally:
In cupertino_settings_item.dart
change final ListTileTheme tileTheme = ListTileTheme.of(context);
to final tileTheme = ListTileTheme.of(context);
And change _iconColor(ThemeData theme, ListTileTheme tileTheme)
to _iconColor(ThemeData theme, ListTileThemeData tileTheme)
.
QUESTION
I use this code to scroll:
...ANSWER
Answered 2021-Oct-26 at 05:16what i did, use a listView and reverse true and in children use the list of map.reversed, i am giving you my code example below.
QUESTION
I am fairly new to the Firemonkey framework after working with VCL for many years so hopefully this question is not too simple.
I am listing Dynamic Listview Items which I update from a database. I have created the position/layout of the text within the Listview Item using design mode . My question is when I change screen orientation from portrait to landscape do I have to manually change the 'X' position of the text items located within my listview and their width so that the full landscape width of the screen is utilized? There appears to be no anchors for dynamically created Listview items. (The text items just have their generic names for the time being.)
I have a pic below of what I am trying to describe. First pic shows deign mode in portrait and second in landscape.
Any suggestions greatly appreciated.
...ANSWER
Answered 2021-Dec-22 at 23:30The Accessory
, Detail
and Text
items have an Align
property that can take values Center
, Leading
or Trailing
. They are recalculated and adjust their position with changes in the screen orientation.
Additionally some items have a separate property, TextAlign
, which sets the position for a text within the space of the Align
result.
QUESTION
I used this flutter package to implement a color picker in my app. My Widget
looks something like this:
ANSWER
Answered 2021-Dec-19 at 00:02please check out this and you need to palette type as paletteType: PaletteType.hueWheel,
. use the same package as used.
QUESTION
I have a mobile application developed using Ionic. Now I want to redevelop it in flutter and publish a new update, would that be possible? will google play and AppStore allow that?
...ANSWER
Answered 2021-Dec-17 at 19:07There is no constraint on development language. But,
- You need to use same certificates/keys for iOS App
- You need to use same key-store/keys for Android App
- If you are using local database or file storage, then you should follow the same path in your newly created app as well. If you are using any third-party library to manage the db or file paths, then it may be in different location altogether. (This one actually happened to me. When I migrated my app from a cross-platform framework to Native the database path got changed in release version)
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