E-Paper | Simple android drawing/canvas app optimized for e-ink screen | Canvas library
kandi X-RAY | E-Paper Summary
kandi X-RAY | E-Paper Summary
Simple android drawing/canvas app optimized for e-ink screen
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Top functions reviewed by kandi - BETA
- Called when the drawing surface is pressed
- Perform erase action on current stack
- Remove a path
- Attempt an error
- Handles key event
- Switch to the previous page
- Return the undo command
- Perform redo operation
- Initializes the drawer
- Sets the selected tool
- Set current paint
- Display a view
- Starts the save thread
- Removes all pages
- Create the FilePicker list
- Callback method for when a long list item is clicked
- Exports all commands to Bitmap
- Draws all the current stack onto the specified bitmap
- Saves pages to disk
- Handle a list item
- Signals that the drawing thread is created
- Signal that this thread is destroyed
- Called when the directory is pressed
E-Paper Key Features
E-Paper Examples and Code Snippets
Community Discussions
Trending Discussions on E-Paper
QUESTION
I'm having 2 navigators and I want to switch between them when I press the login Button.
But every time I dispatch an action via that login button, my application crashes. And I don't understand why, because when I change the initial-value in the Reducer itself, it works fine.
maybe someone got an idea?
Navigation Index File
...ANSWER
Answered 2022-Mar-11 at 19:21const dispatch = useDispatch();
QUESTION
I'm trying to write a PCLMULQDQ-optimized CRC-32 implementation. The specific CRC-32 variant is for one that I don't own, but am trying to support in library form. In crcany model form, it has the following parameters:
width=32 poly=0xaf init=0xffffffff refin=false refout=false xorout=0x00000000 check=0xa5fd3138
(Omitted residue which I believe is 0x00000000
but honestly don't know what it is)
A basic non-table-based/bitwise implementation of the algorithm (as generated by crcany
) is:
ANSWER
Answered 2022-Mar-07 at 15:47I have 6 sets of code for 16, 32, 64 bit crc, non-reflected and reflected here. The code is setup for Visual Studio. Comments have been added to the constants which were missing from Intel's github site.
https://github.com/jeffareid/crc
32 bit non-relfected is here:
https://github.com/jeffareid/crc/tree/master/crc32f
You'll need to change the polynomial in crc32fg.cpp, which generates the constants. The polynomial you want is actually:
QUESTION
After a huge package upgrade, when running Jest tests on our application, we have this error :
...ANSWER
Answered 2022-Mar-02 at 16:48Updating Jest and Babel (and all our modules) fixed the bug...
QUESTION
I was trying to make a reusable component using react-native-paper
the problem comes when I try to use extends a type from the package
...ANSWER
Answered 2022-Feb-28 at 08:39You can extend it as shown below
Create a file ButtonPaper.tsx
QUESTION
I am creating simple application using React-Native, I have problem with ScrollView, My aim is to send Ajax request when scroll ends, and it should happen only once, not every time when scroll ends, important note is that I only should use ScrollView, I am using onScroll event to measure and detect scroll position.
What I tried:
...ANSWER
Answered 2022-Feb-18 at 13:49You can use a ref
with a boolean like so (I called it firstTimeRef
) :
QUESTION
In react native cli i was trying to login but not working nd same thing working fine in expo nd this error is showing please let me know what can i do to do this???? i have added the action ,reducer,component page
getting error this //
WARN Possible Unhandled Promise Rejection (id: 2): Error: [AsyncStorage] Passing null/undefined as value is not supported. If you want to remove value, Use .removeItem method instead. Passed value: undefined Passed key: userToken checkValidInput@http://localhost:8081/index.bundle?platform=android&dev=true&minify=false&app=com.easylab&modulesOnly=false&runModule=true:146791:24 http://localhost:8081/index.bundle?platform=android&dev=true&minify=false&app=com.easylab&modulesOnly=false&runModule=true:146835:24..........................
my action is like this // actions>index.js page
...ANSWER
Answered 2022-Feb-22 at 06:27Your problem is that you are trying to set userToken
to null
on this line:
QUESTION
I am using react-native-bouncy-checkbox
and Flatlist
.
I have created an array object which has
id
,name
,amount
.So far I have achieved:
User can select individual items from the
Flatlist
, and it will add theamount
and display it as total amount.User can also edit the
amount
they have selected using TextInput.
However, I am trying to create a 'Select All' feature.
So, when user presses 'Select All' or taps on the 'checkbox' it should:
- select all the items from the FlatList
- add the total amount
- allow user to edit all the selected amount individually
- update the checkbox to show that it is selected.
So far I have tried getting all the 'checkbox' to show that it is selected when 'Select All' text is pressed or when 'checkbox' is pressed (beside select all text).
I have been trying to get this to work for the last couple of hours but couldn't manage to do it. So any help regarding this issue are most welcome.
CODE SNIPPETS AND APP SCREENSHOTS PROVIDED BELOW:
Code Sample:
...ANSWER
Answered 2022-Feb-21 at 10:13After checking the documentation of react-native-bouncy-checkbox, the following is important.
isChecked
determines the default internal checkbox state. It is only evaluated once.- The
check
-state handling is handled internally by the library. - We want to handle this on our own, in order to check all checkbox with a single state change. To do so, we need to set the
disableBuiltInState
prop to true "if you want to manually handle the isChecked prop and disable built in handling".
Thus, I would suggest the following workflow.
- Create a state array for
isChecked
which contains a boolean flag for each of the elements. - Create a custom
onPress
-handler which gets the index from theFlatList
as a parameter. With that index, we are able to to set the correct boolean flag in our state array totrue
orfalse
. - If
Select All
is pressed, ouronPress
-handler sets all boolean flags of our state array totrue
. This will cause a rerendering of our screen and since we setdisableBuiltInState
prop totrue
, react-native-bouncy-checkbox will use our custom state handling.
Here is a minimal working example.
QUESTION
i want to build a built a navigation with BottomTabNavigator
but i dont know what happen i never see the body of my screens, something is hidding the body, i created a demo to demostrate you the wrong, but its too simple.
this is the file App.js
...ANSWER
Answered 2022-Feb-09 at 14:05Moving between screens
You can create a state for handling user logged in status or you can also use redux for it so It will automatically navigate to the main screen after user logged in
QUESTION
I have recently upgraded my app from SDK 40 to SDK 44 and came across this error App.js: [BABEL]: Unexpected token '.' (While processing: /Users/user/path/to/project/node_modules/babel-preset-expo/index.js)
Error Stack Trace:
...ANSWER
Answered 2021-Dec-21 at 05:52can you give your
- package.json
- node version
I think that's because of the babel issue / your node version, because it cannot transpile the optional chaining https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining
maybe tried using latest LTS node version? because as far as I know, the latest LTS node version already support optional chaining
QUESTION
i have the Invariant Violation: Native module cannot be null error and the 2nd error down below. I found online the issue might have to do with not having an ios folder in a module directory, i looked in each of the folders in the local system and on github with them all containing the ios folder
...ANSWER
Answered 2022-Jan-20 at 05:12Check the library @react-navigation/drawer
compatibility with IOS and Android respectively , link it manually sometimes autolinking doesn't work. Ensure you are running correct project , clean build and install pod and check it out.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install E-Paper
You can use E-Paper like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the E-Paper component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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