View | 如果大家对自定义ViewGroup和自定义View有一定的掌握,肯定不会对onMeasure方法陌生:
kandi X-RAY | View Summary
kandi X-RAY | View Summary
如果大家对自定义ViewGroup和自定义View有一定的掌握,肯定不会对onMeasure方法陌生: ViewGroup的onMeasure方法所做的是: childView设置测量模式和测量出来的值。 如何设置呢?就是根据LayoutParams。 如果childView的宽为:LayoutParams. MATCH_PARENT,则设置模式为MeasureSpec.EXACTLY,且为childView计算宽度。 如果childView的宽为:固定值(即大于0),则设置模式为MeasureSpec.EXACTLY,且将lp.width直接作为childView的宽度。 如果childView的宽为:LayoutParams. WRAP_CONTENT,则设置模式为:MeasureSpec.AT_MOST 高度与宽度类似。 View的onMeasure方法: 主要做的就是根据ViewGroup传入的测量模式和测量值,计算自己应该的宽和高: 一般是这样的流程: 如果宽的模式是AT_MOST:则自己计算宽的值。 如果宽的模式是EXACTLY:则直接使用MeasureSpec.getSize(widthMeasureSpec);.
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Top functions reviewed by kandi - BETA
- Initializes the list
- Get the singleton instance
- Convert input string to tokens
- Creates a token for the specified character
- OnDraw method
- Generate the dst bitmap
- Generate the source bitmap
- Override this method to draw the transparent color on the circle
- Gets the path for a rectangle
- Sets the path to the canvas
- Initializes the View
- Override this to adjust the size of the view
- Override on measure size
- Draws the path
- Handles a touch event
- Region measure
- Initialize the primitive arrays
- Called when the layout is changed
- Initialize the circle
- Override onDraw method
- This method is called when layout is changed
- Create the entries
- Initializes the RecyclerView
- This method is called when the tag is changed
- On draw
- Draws the transparent color
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Community Discussions
Trending Discussions on View
QUESTION
I have prepare 2 tree view in separate iframe using jstree. The right tree view should control the left tree view. When user click one one the list in right tree view, the respective item folder will open and selected on left tree view. I can make it happen using div in single page. I control the left tree view using instance of left tree view in right jstree div var instance = $('#left').jstree(true);
.
ANSWER
Answered 2021-Jun-16 at 03:07I had used document.getElementById('1').contentWindow.jQuery('#left').jstree(true);
to get instance from iframe with id='1'. In order to listen to right iframe(with id='2') if any menu has been clicked, I used document.getElementById('2').contentWindow.jQuery('#right').on("changed.jstree",function(e,data){})
. I get the instance of left iframe within this function. By using this instance, I has deselect previous selection, select current selection, and open children of selected menu.
index-12.html
QUESTION
I was making a simple to do app with mvc pattern and I saw an article which said you shouldn't pass the model values directly to the view, which made the project more complex than I thought (I am relatively new to programming and this is the first time I am trying out a design pattern).
But then later on I talked to someone who said that that is not true and you can send the model data directly to view, he didn't even use classes or some kind of grouping to separate the function he just put them in separate files.
I was wondering if there is a guideline that I couldn't find or we can do whatever we want as long as they are kind of separated. I would love an article or a guide to read up on as well.
...ANSWER
Answered 2021-Jun-16 at 01:01Since, I am not 100% sure the context in which you are trying to apply the MVC pattern, a good generic explanation of MVC can be found in GoF's 1995 book, Design Patterns: Elements of Reusable Object Oriented Software.
In the book, they state the following.
The Model is the application object, the View is its screen presentation, and the Controller defines the way the user interface reacts to user input.
A more robust explanation can be found from Martin Fowler where he also makes the case for a variation of Model View Controller that uses a Presentation Model.
If you are referring to Spring MVC then there is some magic that blurs the lines a bit. But in general, you have a controller that represents some screen or an encapsulated piece of functionality that the user (web requests) interact with. The controller serves up responses that are derived from the domain, usually via a Spring Service (i.e. @Service). The domain (Model) doesn't know anything about the View and the View may or may not know anything about the domain.
Given that, the View should be derived from the Model. But that's not always the case since sometimes how we present things to a screen is not the best logical way to model things in our domain - not to mention, the domain should be presentation agnostic. This leads into Fowler's argument for a Presentation Model, which is a model that belongs to the Presentation.
I call this a Presentation Model because it's a model that is really designed for and thus part of the presentation layer.
Microsoft took that idea and ran with it in a variant of MVC called MVVM (Model View ViewModel).
You can read more about that in Microsoft's documentation on ASP.Net Core.
So, back to your original question of "Should you pass the model directly to the view?" If you are using MVC then the controller is what provides the interaction. But if you're really asking, "Can you bind your view directly to the model?" If your model has all the stuff you need organized how your view needs it, then sure. And if it's simple enough, maybe that's the way to go. Otherwise, you could go with something like a Presentation Model or MVVM.
QUESTION
Giving a bit of context. I'm using c++17. I'm using pointer T* data
because this will interop with cuda code. I'm trying write a parallel version (on CPU) of a histogram creator. The sequential version:
ANSWER
Answered 2021-Jun-16 at 00:46The issue you are having has nothing to do with templates. You cannot invoke std::async()
on a member function without binding it to an instance. Wrapping the call in a lambda does the trick.
Here's an example:
QUESTION
Can someone help me investigate why my Chainlink requests aren't getting fulfilled. They get fulfilled in my tests (see hardhat test etherscan events(https://kovan.etherscan.io/address/0x8Ae71A5a6c73dc87e0B9Da426c1b3B145a6F0d12#events). But they don't get fulfilled when I make them from my react app (see react app contract's etherscan events https://kovan.etherscan.io/address/0x6da2256a13fd36a884eb14185e756e89ffa695f8#events).
Same contracts (different addresses), same function call.
Updates:
Here's the code I use to call them in my tests
...ANSWER
Answered 2021-Jun-16 at 00:09Remove your agreement vars in MinimalClone.sol
, and either have the user input them as args in your init()
method or hardcode them into the request like this:
QUESTION
In part of my application I have an option that displays a list of albums by the current artist that aren't in the music library. To get this I call a music API to get the list of all albums by that artist and then I remove the albums that are in the current library.
To cope with the different casing of names and the possibility of missing (or extra punctuation) in the title I have written an IEqualityComparer
to use in the .Except
call:
ANSWER
Answered 2021-Jun-15 at 23:05If you're going to use the CompareOptions
enum, I feel like you might as well use it with the CompareInfo
class that it's documented as being designed for:
Defines the string comparison options to use with CompareInfo.
Then you can just use the GetHashCode(string, CompareOptions)
method from that class (and even the Compare(string, string, CompareOptions)
method if you like).
QUESTION
I am a beginner in Data Science, so please sorry if my mistake is dumb.
Here, I have a loop which views my data frame and makes changes using .loc The problem is that the changes are not saved at the end. I checked every step, everything is processing right. I even checked the modified cell right after working on it (look below) and its gives the value I put into it. However, when the program finishes the my excel data frame is not changed at all.
Help please. Thank you in advance!
...ANSWER
Answered 2021-Jun-13 at 21:56when the program finishes my excel data frame is not changed at all.
That's because you never wrote anything to the Excel file. With exc = pd.read_excel('...')
you create a Python object exc
(more specifically, a pandas DataFrame), and all the subsequent modifications happen to this object. To change the source file accordingly, you can use pandas' DataFrame.to_excel()
method, by adding this line in the end:
QUESTION
So I was fetching data from my database to print in a table however, it says that Class "App\Http\Controllers\User" not found. Here is the controller and here is how I will print the data
...ANSWER
Answered 2021-Jun-15 at 22:42At the top off your controller add
Laravel 8+
QUESTION
I've been struggling with this all over my react-native app, so I set up a very simple example of it in codesandbox which you can view here:
https://codesandbox.io/s/elastic-star-5754q?file=/src/App.js
Within the View with the green background, all of the internal views are centered horizontally within their respective spaces as I would expect thanks to the "alignItems: center" style property. I would expect that I could also center them vertically within their spaces by setting "justifyContent: center", but that doesn't seem to work for me.
Am I fundamentally misunderstanding something?
...ANSWER
Answered 2021-Jun-15 at 21:59The problem is that you are not aligning the text within the individual Views. Your example mistakenly aligns the inner View elements within the larger View element rather than aligning the text.
To center-align the text vertically within their Views you just need to add justifyContent: "center"
to those individual three green Views.
Here's an example: https://codesandbox.io/s/recursing-kirch-n8one?file=/src/App.js:393-417
To further explain why you were experiencing the issue you did, see this screenshot with boxes outlining the space the elements were taking up on-screen:
You can see the inner View
s are only taking up the needed width of the text
elements inside, but are using the max height available to them.
QUESTION
My app consists in letting you add lists in which you can keep your notes. Therefore, I have this NotesListActivity where I can add and keep my Lists. I wanted to filter this lists following the https://www.youtube.com/watch?v=CTvzoVtKoJ8 tutorial and then I tried to adapt it to my code like below. Could you please tell me what is the problem here, cause I don't even get an error, I just not get any title of list as result. So, this is what I have in my RecyclerAdapter:
...ANSWER
Answered 2021-Jun-13 at 20:18The problem is that you are using an empty notesListAll
list for filtering results; you need to populate it with the list of notes in the constructor
QUESTION
I'm creating an application where the user can post information and see the information posted, something like a forum. I created a list where the publications stored in the database are shown, so on the main page that list is shown with the title, description, date, etc. of each publication. Now, what I'm trying to do is select anyone of the posts in the list and then display the full information of the selected post in other view. I'm using a MVC view with its respective controller to consume the API.
The code on the API controller to get the info of the selected post:
...ANSWER
Answered 2021-Apr-12 at 02:43Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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Install View
You can use View 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 View 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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