Android Training - Pull to Refresh
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This document outlines how to implement a pull to refresh feature for lists on Android. It discusses the design, which involves pulling down a list to see loading messages then refresh. It also covers how to handle touch events, adding views, smooth scrolling using interpolators, and using the window manager. The homework asks students to modify sample code to allow pulling from the left or both top and bottom to refresh a list.
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In which you can find all android Listeners. which is used to handle event handle.
view event Listener ,adapter event listener and other listeners
Scratching the Surface with JavaFX
One of the very interesting and useful platforms for JavaFX is touch enabled devices such as Windows 8 tablets. This session will demonstrate a variety of JavaFX applications running on a Surface Windows 8 Pro, pointing out capabilities in JavaFX designed to leverage touch capabilities.
Event oriented programming
Event-driven programming is a programming paradigm where the flow of the program is determined by events such as user input. In event-driven programming, an event trigger causes an event handler method to execute. Common event triggers include user interactions like mouse clicks or key presses. This paradigm is well-suited for graphical user interfaces that allow users to interact with and control the flow of the program.
Similar to Android Training - Pull to Refresh (20)
Tips for building fast multi touch enabled web sites
Tips for building fast multi touch enabled web sites
Presentation on Android application life cycle and saved instancestate
Presentation on Android application life cycle and saved instancestate
More from Kan-Han (John) Lu
Dagger for android
One of the central difficulties of writing an Android application using Dagger is that many Android framework classes are instantiated by the OS itself, like Activity and Fragment, but Dagger works best if it can create all the injected objects. Instead, you have to perform members injection in a lifecycle method.
Android develop guideline
Android develop guideline:
- Android develop environment
- Android coding style
- Workflow
- Teamwork
- Good practice
Working process and git branch strategy
1. The document discusses different workflows and Git branch strategies for software development projects.
2. It shares prior experience with development workflows that include roles like project leader, engineer, product manager, tester, and processes like discussion, design, implementation, testing, and release.
3. The author proposes a better flow that focuses on finishing issues rather than versions, and having a clear project specification and tasks tracked in a dashboard.
Deep neural network for youtube recommendations
The presentation of reading
https://static.googleusercontent.com/media/research.google.com/en//pubs/archive/45530.pdf
Android testing part i
This document discusses software testing and Android testing. It covers unit testing with JUnit and mock objects in Android. Unit tests isolate classes and replace dependencies with mocks. The document provides examples of writing unit tests for an EmailValidator class. It also discusses instrumented tests and testing asynchronous functions. Best practices like writing testable code and case studies are presented.
Cuda project paper
Distributed Video Coding (DVC) has become increasingly popular in recent times among the researchers in video coding due to its attractive and promising features. DVC primarily has a modified complexity balance between the encoder and decoder, in contrast to conventional video codecs. However, Most of the reported DVC schemes have a high time-delay in decoder which hinders its practical application in real-time systems. In this work, we focus on speed up the Side Information(SI) generation module in DVC, which is a major function in the DVC coding algorithm and one of the time-consuming factor at the decoder. By applied it through Compute Unified Device Architecture (CUDA) based on General-Purpose Graphics Processing Unit (GPGPU), the experimental results show that a considerable speedup can be obtained by using the proposed parallelized SI generation algorithm.
Twitter as a personalizable information service ii
Twitter is a free social networking microblogging service that allows registered members to broadcast, in real-time, short posts called tweets. Twitter members can broadcast tweets and follow other users’ tweets by using multiple devices, making this information system one of the fastest in the world. In this chapter, we leverage this characteristic to introduce a novel topic-detection method aimed at informing, in real-time, a specific user about the most emerging arguments expressed by the network around his/her domain interests. With this goal, we aim at formalizing the information spread over the network by studying the topology of the network and by modeling the implicit and explicit connections among the users. Then, we propose an innovative term aging model, based on a biological metaphor, to retrieve the freshest arguments of discussion, represented through a minimal set of terms, expressed by the community within the foci of interest of a specific user. We finally test the proposed model through various experiments and user studies.
Multimedia data minig and analytics sentiment analysis using social multimedia
● The growing importance of sentiment analysis coincides with the popularity of social network platform (Facebook, Twitter, Flickr).
● A tremendous amount of data in different forms including text, image, and videos makes sentiment analysis a very challenging task.
● In this chapter, we will discuss some of the latest works on topics of sentiment analysis based on visual content and textual content.
ARM: Trusted Zone on Android
The document discusses trusted execution environments (TEEs) and their importance in mobile security. It describes GlobalPlatform's standardization of the TEE model with a normal world and secure world separated by TrustedZone technology. The TEE provides secure services to client applications in the normal world through a trusted foundation or mobile security technology from vendors like Trusted Logic, TI, Nvidia, and Qualcomm. Examples of secure services include secure storage, cryptography, and implementations of digital rights management (DRM). Netflix is given as an example client application that could leverage TEE security for content protection.
Android Training - Card Style
The document discusses card-style training and how to implement card interfaces. Card-style interfaces can improve user experience by highlighting conversations and items in a trimmed, streamlined way. The document outlines what card-style is, how Google uses it in various apps, design considerations for cards including headers, content and actions, and how to implement swipe-to-dismiss gestures and popup menus for cards in a list view. Homework is provided to modify the sample code into a grid view and add an information button to cards.
Android Training - View Pager
This document discusses ViewPager training and includes the following key points:
1. ViewPager allows users to flip left and right through pages of data and works with Android 1.6 and above. It functions similarly to adapters like ListView.
2. Examples of ViewPager design include unlimited swipable pages, circular view pagers that loop from one side to the other, and using page transformers and indicators to transform pages and show page position.
3. Implementing ViewPager involves using a page adapter to instantiate fragments, listening for page changes, and transforming pages with techniques like scaling and fading them out as they move between positions.
Android Training - Sliding Menu
This document provides an overview and instructions for implementing a sliding menu navigation component. It discusses the design considerations for the menu content and interaction with the action bar. Technical details are given for using DrawerLayout to position the menu and main content views as well as handling click and slide events. The summary restates the importance of navigation and how the sliding menu reflects the app's structure. Homework involves expanding the sample code to include dual sliding menus from the left and right without using DrawerLayout.
Java: Exception Handling
The document discusses exception handling in programming languages. It introduces exceptions as data structures that store information about exceptional conditions. Exceptions can be thrown to transfer control to catch blocks. The document provides an example of throwing an exception if a number is greater than a stop number, and catching and trying the exception. Finally, it lists some reasons for using exceptions, such as avoiding unhandled errors, improving readability, exception safety, catching by solvers, and providing more information on exceptions.
Dynamic Proxy by Java
Dynamic proxies in Java allow an object to dynamically implement interfaces at runtime through reflection and runtime type information. This avoids tight coupling between interfaces and their implementations. Proxies delegate method calls to a real subject object behind the scenes, making it possible to implement interfaces without the implementation class directly implementing them.
Code analyzer: FindBugs and PMD
The document discusses two code analysis tools, FindBugs and PMD. It provides an overview of what each tool is used for, how to install them in Eclipse, and mentions configuration options. FindBugs looks for bug patterns in Java code, while PMD scans for potential problems like empty code blocks, dead code, overcomplicated expressions, and duplicate code. Instructions are given on installing each plugin for Eclipse, but details of how to use the tools and configure rules are not provided.
Android UI System
The document discusses Android's GUI system architecture. It describes how ActivityManagerService and WindowManagerService manage applications and windows. It explains that activities start processes and draw views. SurfaceViews are used to control an application's drawing state, with surfaces being created and destroyed as windows are relaid out by WindowManagerService. Experience sharing tips are provided around AsyncTasks, broadcast receivers, file splitting, and dialog dismissal.
Android Fragment
Fragments allow modular sections of an activity's UI to be reused across activities and configurations. A fragment must be embedded in an activity and shares its lifecycle. Fragments can be added or removed dynamically at runtime and their transactions can be added to a back stack. Activities can combine multiple fragments to build a multi-pane UI on tablets and reuse fragments across activities on handsets. To create a fragment, subclass Fragment and move code from activities into fragment lifecycle methods.
Android Training - Content Sharing
The document discusses content sharing on Android devices, including how to implement sharing functionality using a ShareActionProvider to allow users to easily share content such as text, images, and files with other applications through a standard mechanism displayed as a share button. It also covers using intents and content providers to provide indirect access to shared data and allow other applications to work with that data. The document provides examples of how to implement different types of content sharing and recommends using a simple design with a ShareActionProvider for user-friendly sharing from an app's action bar.
Android Training - Action Bar
The document discusses the Android action bar user interface element. The action bar identifies the user's location within an app and provides actions and navigation options in a consistent way across different apps and device configurations. It can include menu items, a search bar, an "up" button to navigate higher levels, and may split onto a separate bottom bar on narrow screens. Advanced topics covered include quick return patterns, fading effects, and supporting older Android versions or fragments. The document provides references for further information on styling, customization, and the software development kit API.
Explaination of angular
Angular works by first declaring modules, then creating an injector to provide dependencies. It bootstraps by initializing modules and injecting services. The root element is then compiled, collecting directives and expressions, and finally bound to a scope for data binding. This allows Angular to separate concerns through dependency injection while enabling two-way data binding between application data and views.
More from Kan-Han (John) Lu (20)
Twitter as a personalizable information service ii
Twitter as a personalizable information service ii
Multimedia data minig and analytics sentiment analysis using social multimedia
Multimedia data minig and analytics sentiment analysis using social multimedia
Recently uploaded
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...University of Maribor
Slides from talk:
Aleš Zamuda: Remote Sensing and Computational, Evolutionary, Supercomputing, and Intelligent Systems.
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Inter-Society Networking Panel GRSS/MTT-S/CIS Panel Session: Promoting Connection and Cooperation
https://www.etran.rs/2024/en/home-english/原版制作(carleton毕业证书)卡尔顿大学毕业证硕士文凭原版一模一样
原版纸张【微信：741003700 】【(carleton毕业证书)卡尔顿大学毕业证】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
20240520 Planning a Circuit Simulator in JavaScript.pptx
Evaporation step counter work. I have done a physical experiment.
(Work in progress.)
Deep Software Variability and Frictionless Reproducibility
Deep Software Variability and Frictionless ReproducibilityUniversity of Rennes, INSA Rennes, Inria/IRISA, CNRS
The ability to recreate computational results with minimal effort and actionable metrics provides a solid foundation for scientific research and software development. When people can replicate an analysis at the touch of a button using open-source software, open data, and methods to assess and compare proposals, it significantly eases verification of results, engagement with a diverse range of contributors, and progress. However, we have yet to fully achieve this; there are still many sociotechnical frictions.
Inspired by David Donoho's vision, this talk aims to revisit the three crucial pillars of frictionless reproducibility (data sharing, code sharing, and competitive challenges) with the perspective of deep software variability.
Our observation is that multiple layers — hardware, operating systems, third-party libraries, software versions, input data, compile-time options, and parameters — are subject to variability that exacerbates frictions but is also essential for achieving robust, generalizable results and fostering innovation. I will first review the literature, providing evidence of how the complex variability interactions across these layers affect qualitative and quantitative software properties, thereby complicating the reproduction and replication of scientific studies in various fields.
I will then present some software engineering and AI techniques that can support the strategic exploration of variability spaces. These include the use of abstractions and models (e.g., feature models), sampling strategies (e.g., uniform, random), cost-effective measurements (e.g., incremental build of software configurations), and dimensionality reduction methods (e.g., transfer learning, feature selection, software debloating).
I will finally argue that deep variability is both the problem and solution of frictionless reproducibility, calling the software science community to develop new methods and tools to manage variability and foster reproducibility in software systems.
Exposé invité Journées Nationales du GDR GPL 2024
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...Abdul Wali Khan University Mardan,kP,Pakistan
hematic appreciation test is a psychological assessment tool used to measure an individual's appreciation and understanding of specific themes or topics. This test helps to evaluate an individual's ability to connect different ideas and concepts within a given theme, as well as their overall comprehension and interpretation skills. The results of the test can provide valuable insights into an individual's cognitive abilities, creativity, and critical thinking skills在线办理(salfor毕业证书)索尔福德大学毕业证毕业完成信一模一样
学校原件一模一样【微信：741003700 】《(salfor毕业证书)索尔福德大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
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三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
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◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
Sharlene Leurig - Enabling Onsite Water Use with Net Zero Water
Sharlene Leurig - Enabling Onsite Water Use with Net Zero WaterTexas Alliance of Groundwater Districts
Presented at June 6-7 Texas Alliance of Groundwater Districts Business MeetingThornton ESPP slides UK WW Network 4_6_24.pdf
ESPP presentation to EU Waste Water Network, 4th June 2024 “EU policies driving nutrient removal and recycling
and the revised UWWTD (Urban Waste Water Treatment Directive)”
Randomised Optimisation Algorithms in DAPHNE
Slides from talk:
Aleš Zamuda: Randomised Optimisation Algorithms in DAPHNE .
Austrian-Slovenian HPC Meeting 2024 – ASHPC24, Seeblickhotel Grundlsee in Austria, 10–13 June 2024
https://ashpc.eu/
ESR spectroscopy in liquid food and beverages.pptx
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
Bob Reedy - Nitrate in Texas Groundwater.pdf
Presented at June 6-7 Texas Alliance of Groundwater Districts Business Meeting
bordetella pertussis.................................ppt
Bordettela is a gram negative cocobacilli spread by air born drop let
Compexometric titration/Chelatorphy titration/chelating titration
Classification
Metal ion ion indicators
Masking and demasking reagents
Estimation of Magnisium sulphate
Calcium gluconate
Complexometric Titration/ chelatometry titration/chelating titration, introduction, Types-
1.Direct Titration
2.Back Titration
3.Replacement Titration
4.Indirect Titration
Masking agent, Demasking agents
formation of complex
comparition between masking and demasking agents,
Indicators/Metal ion indicators/ Metallochromic indicators/pM indicators,
Visual Technique,PM indicators (metallochromic), Indicators of pH, Redox Indicators
Instrumental Techniques-Photometry
Potentiometry
Miscellaneous methods.
Complex titration with EDTA.
Recently uploaded (20)
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...
Remote Sensing and Computational, Evolutionary, Supercomputing, and Intellige...
20240520 Planning a Circuit Simulator in JavaScript.pptx
20240520 Planning a Circuit Simulator in JavaScript.pptx
Deep Software Variability and Frictionless Reproducibility
Deep Software Variability and Frictionless Reproducibility
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
mô tả các thí nghiệm về đánh giá tác động dòng khí hóa sau đốt
mô tả các thí nghiệm về đánh giá tác động dòng khí hóa sau đốt
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Sharlene Leurig - Enabling Onsite Water Use with Net Zero Water
Sharlene Leurig - Enabling Onsite Water Use with Net Zero Water
ESR spectroscopy in liquid food and beverages.pptx
ESR spectroscopy in liquid food and beverages.pptx
bordetella pertussis.................................ppt
bordetella pertussis.................................ppt
Compexometric titration/Chelatorphy titration/chelating titration
Compexometric titration/Chelatorphy titration/chelating titration
Android Training - Pull to Refresh
- 1. Pull To Refresh Training 2014/03/11 John
- 2. Outline ● Introduction ● Design ● How to implement ○ Touch Event ○ Adding view ○ On Touching ○ Smooth Scrolling ○ Window Manager ● Summary ● Homework
- 3. Introduction
- 4. Introduction There is a patent application for the “pull-to-refresh” feature that Loren Brichter pioneered in Tweetie and is now an extremely popular UI gesture used in a lot of iOS, Mac and Android apps. ref: http://goo.gl/PjTjMA
- 5. Design 1. The user pulls down a list. 2. A message appears, telling the user who can pull down the list to refresh. 3. The user pulls the list further down. 4. A new message appears, telling the user that the list will refresh when he releases it. 5. A refreshing or loading message appears. 6. The refreshing message disappears and a new list is shown, with the new items at the top of the list.
- 7. How to implement Touch event Touch Event
- 8. How to implement Touch event The onInterceptTouchEvent() method is called whenever a touch event is detected on the surface of a ViewGroup, including on the surface of its children. The onInterceptTouchEvent() method gives a parent the chance to see any touch event before its children do.
- 9. How to implement Managing Touch events Use ViewConfiguration Constants ref: http://goo.gl/JJN80z
- 10. How to implement Managing Touch events Extend a Child View's Touchable Area ref: http://goo.gl/JJN80z
- 11. How to implement Adding View
- 12. How to implement On Touching ● Touch event filter. ● Setting variable up.
- 13. How to implement On Touching ● Doing actions.
- 14. How to implement Smooth scrolling Ref: http://goo.gl/eb3DQH SmoothScrollRunnable: ● Get next position from Interpolator. ● Set scroll to position. ● Post(this).
- 15. How to implement Window Manager ● Every display has a WindowManager. ● WindowManager is a System Manager.
- 16. How to implement Window Manager Ref: http://goo.gl/sWHpp
- 17. Summary ● “Make it a little simpler” ● How dose Touch event transit. ● How to implement smooth scrolling.
- 18. Homework Sample source code: (You can also fInd it at the video record nearby if this link is invalid.) https://www.dropbox.com/s/9zqt60tf7drppyi/TrainingPullToRefresh.zip Basic: ● Let it be pulled from left. Advance: ● Let it be pulled from both top and bottom.