RecyclerPinnedHeader | RecyclerView 固定标题Item | RecyclerView library
kandi X-RAY | RecyclerPinnedHeader Summary
kandi X-RAY | RecyclerPinnedHeader Summary
列表展示是开发过程中经常用到的功能，通常通过 ListView 或者 RecyclerView 控件来实现。在列表显示的过程中可能会碰到这样的需求：需要对列表进行分组，每个分组都有标题 item view 和内容 item view 而且希望列表在滑动的过程中每个分组的标题 item view 可以一直固定的列表的顶部。之前的博客我们已经通过ListView实现了这一功能，有兴趣的可以参考链接Android分组悬浮列表实现。but这一次我们通过 RecyclerView 来实现这一需求。实现过程比 ListView 的实现过程要更加简单。. 在讲怎么实现之前先献上通过RecyclerView实现的效果图. 接下来就是实现过程了. 我们知道 RecyclerView 给提供了一个RecyclerView.ItemDecoration 来给我们使用，这可是好东西呀。RecyclerView.ItemDecoration 从字面上来看是用来给 RecyclerView 里面每个 item 添加装饰用的(当然也可以给RecyclerView的整体添加装饰)。例如，你可以通过 RecyclerView.ItemDecoration 来给 RecyclerView 的每个 item 添加分割线、给每个 item 添加 padding 等等。这里我们通过 RecyclerView.ItemDecoration 来实现 RecyclerView 分组悬浮列表的功能。. 我们先简单的看下RecyclerView.ItemDecoration里面几个函数：. 看到 ItemDecoration 提供到我们的就三个函数了：onDraw()、onDrawOver()、getItemOffsets()。getItemOffsets()函数会在 RecyclerView 里面每个子 view 测量的时候调用，可以用来给每个子 view 添加offset(间距)。onDraw()会在RecyclerView的onDraw()方法里面调用。onDrawOver()函数会在RecyclerView的draw()函数里面调用。关于onDraw()、onDrawOver()两个函数的区分咱们可以简单的认为onDraw()是在RecyclerView绘制内容的时候调用。onDrawOver()是在RecyclerView绘制完内容之后再调用，相当于可以在RecyclerView之上在绘制一层内容。. 通过对 RecyclerView.ItemDecoration 类的简单分析，再结合我们分组固定标题 View 的需求，我们是要把每个分组的标题 View 固定在顶部，恩，那肯定是在要绘制在RecyclerView层之上的吧，和RecyclerView.ItemDecoration里面的onDrawOver()函数正好对应上了。. 接下来的事情就好办了. 首先，既然有些标题是要固定的，那咱们一定要明确的知道哪些position位置对应的view是标题吧，只能通过adapter做文章了，所有我们就有了一个基础的PinnedHeaderAdapter，代码如下：. 接下来，RecyclerView.ItemDecoration里面的onDrawOver()函数里面我们做好三件事情就好了:第一，找到当前界面要一直固定在顶部的 View、第二，把找到固定在顶部的 View 画在 RecyclerView 的顶部、第三，当将要到达顶部的标题 View 和已经画在顶部的 View 相遇的时候顶部 view 上移的问题。这三个问题实现起来也不复杂，所以这里我们就直接贴代码了，毕竟代码才是王道吗。. 整个功能到这就结束了，是不是很简单.
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Top functions reviewed by kandi - BETA
- Initializes the activity
- Switch expand
- Obtain group item list
- Called when the activity is created
- Switch expand
- Obtain group item list
- Initializes the grid
- Initialize view
- Obtain the list of media
- Region Override Override
- Ensure the pinned header view is correct
- Get position of PinnedHeaderView
- BindViewHolder to view
- Gets the state of the given state
- Get the color of a state
- Intercepts the orientation of the header
- Gets the pin decoration
- Initializes the View
- Obtain the list of data
- Returns the total number of items in the expansion list
- Factory method for creating view holder
- Handle a touch event
- BindViewHolder
- Called when a ViewHolder is bound to the data list view
RecyclerPinnedHeader Key Features
RecyclerPinnedHeader Examples and Code Snippets
Community Discussions
Trending Discussions on User Interface
QUESTION
script_a.py
...ANSWER
Answered 2022-Apr-18 at 02:03With many hours of testing, I did have success in running two Tk() loops, but it had potential to be problematic, as "Bryan Oakley" had posted in many threads about.
Ultimately, I decided when I was in need of running something alone, I'd start my GUI with arguments and process it in an entirely new process instead of passing any arguments directly. Seems like a safer option.
QUESTION
ANSWER
Answered 2021-Sep-30 at 06:06If you want to stick to using a Plain button, try entering a thin space (U+2009) character as the title, which won't consume much space and solves the issue. (Thanks to @El Tomato for suggesting white space characters)
Here it is for easier copy-pasting:
QUESTION
ANSWER
Answered 2022-Mar-14 at 19:06@override
Widget build(BuildContext context) {
return Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: _writePost,
tooltip: 'Increment',
child: Icon(Icons.create, color: Colors.grey[300]),
),
body: SizedBox(
height: MediaQuery.of(context).height*0.8, // add this line
child:
// Container( // do not need this
// child: // and this do not need
// Column(children: [ // and this do not need
StreamBuilder>(
initialData: const [],
stream: _socketStream.stream,
builder: (context, snapshot) {
if (_isLoading) {
return const Center(
child: CircularProgressIndicator(),
);
}
ListView( // change this to ListView.builder for more performance
scrollDirection: Axis.vertical,
shrinkWrap: true,
children: [
...snapshot.data!.map(
(post) => Padding(
key: ValueKey(post.id),
padding: const EdgeInsets.symmetric(vertical: 10),
child: ListTile(
title: Text(
post.content,
style: const TextStyle(fontSize: 20),
),
trailing: MaterialButton(
onPressed: () {
_deletePost(post.id);
},
child: const Icon(
Icons.delete,
size: 30,
),
),
),
),
)
],
);## Heading ##
},
),
// ]) // comment this
// ). // and comment this
)
);
}
QUESTION
I am building a landing page that has a logo and then a sign in and login button below it. I used a box decoration to specify the background color because I am very particular about the gradient scheme. However, I realize it may have some kind of "absolute" effect on my container widget because I can't seem to change the colors of the buttons within the widget. I am new to flutter UI and I am probably layering the widgets incorrectly, but any help would be greatly appreciated! Here's the code for the landing page:
...ANSWER
Answered 2022-Mar-03 at 11:44Try this it will work. Change on pressed from null to this.....
QUESTION
On macOS Monetrey, when I move a child NSWindow to another screen (by manually dragging it), it disappears. Minimal repro using SwiftUI:
...ANSWER
Answered 2022-Feb-27 at 16:17I do believe you just want to add a second NSWindow, or a NSPanel. Without a child window relation. In AppKit document-based apps you would for example overwrite -[NSDocument makeWindowControllers] and setup multiple window controllers for one document.
Child windows are for special use cases, for example: functionality like autocompletions lists, where you would want a chrome-less window with a table view beneath a textfield, which automatically follows the parent window when moved.
Here is TextEdit with such a autocompletions window and the Xcode Debug View Hierarchy of the same:
See this note from the documentation:
After the childWin is added as a child of the window, it is maintained in relative position indicated by place for subsequent ordering operations involving either window. While this attachment is active, moving childWin will not cause the window to move (as in sliding a drawer in or out), but moving the window will cause childWin to move.
I don't believe that a child window was ever intended to be independently moved from its parent window, especially different screens.
QUESTION
What I want to do is to open a new Countrypage sub-window by clicking on the "New" button which is in Countrypage itself.
For example, if I click the "New" button in a CountryPage window (window title: "Country page"), one more new Countrypage window will be opened in the MDI area (window title: "Country Page 1"). Now if we click the "New" button in "Country Page 1", one more new window will open in the MDI area (window title: "Country page 2") and so on - and I want to close the windows one by one by pressing the corresponding "Close" button in Countrypage. New window are opened only by pressing a "New" button.
And if we close the last opened window by pressing the "Close" button, the text item in the "Country" text-box will be automatically updated in the previous window's "Country" text-box and so on.
Main Script :
...ANSWER
Answered 2022-Feb-14 at 18:38The adding and closing of sub-windows is best handled by the main-window. The CountryPage class doesn't need to know anything about the sub-windows. The new/close buttons can be directly connected to methods of the main-window. This makes it easier to manage the sub-windows via the functions of the mdi-area.
Below is a re-write of your example which should do what you asked for:
Main Script:
QUESTION
In angular,
This is script
...ANSWER
Answered 2021-Dec-30 at 01:04Some alternatives you can use:
QUESTION
I'm working on a cross-platform project in C++ generating the UI dynamically, and I am struggling with C++/winRT UWP NavigationView on two problems:
- When defining a NavigationViewItemHeader, the resulting header title doesn't show in the navigation menu, the space remains empty,
- When trying to update the SettingsItem of the navigation menu, the value of the Settings navigation item is nullptr as returned by SettingsItem().
Here is the code I wrote for generating the menu from a list of items managed independently from the host (e.g. Windows):
...ANSWER
Answered 2022-Feb-02 at 11:34Dynamic Headers/Footers enable different grouping options in reports, such as "By Location" or "By Location By System": Note that the words "Report Definitions" are circled above. Although reports can have up to three Dynamic Headers/Footers, some reports only have one or two Dynamic Groups.
QUESTION
While exploring TextField in a Jetpack Compose, I came across a case where I have to modify input typed in the field. For example, adding a comma after entering 3 characters.
This is how I made it.
...ANSWER
Answered 2021-Dec-18 at 11:45This kind of cases is exactly what VisualTransformation is intended for.
Here's a Googler's comment on another issue:
I don't think we can fix this issue easily.
The filtering text in onValueChanged callback is generally not recommended because the text state is shared with out process IME(software keyboard). The filtering text means the text content changes internally, then the new state is notified to IME. This is not a normal path to IME and different IME reacts differently to this unexpected state change. Some IME may try to reconstruct the composition, others may give up and start new session, etc. This is mostly due of the historical reason and hard to fix from now. So, please avoid filtering text in onValueChanged callback and consider following alternatives:
- (Recommended) Don't filter it and show error message. (irrelevant here)
- Use VisualTransformation for changing visual output without modifying edit buffer.
QUESTION
I am trying to model credit card data in JavaFx using a GridPane:
My model contains 3 rows (Note: each field is comprised of label + text field):
Row 1: First name and last name (4 fields)
Row 2: Credit card number (2 fields)
Row 3: Expiration date - month, year + CVV (6 fields)
See screenshot below:
I was reading this tutorial which states:
All cells in the same row will have the same height, and all cells in the same column will have the same width. Different rows can have different heights and different columns can have different widths.
Are there any workarounds to to have different size columns on a row by row basis in a GridPane?
ANSWER
Answered 2021-Nov-24 at 00:54For the specific layout in the image, I would use a VBox with HBox for rows:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install RecyclerPinnedHeader
You can use RecyclerPinnedHeader 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 RecyclerPinnedHeader 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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