scroll

问题 This is a simple example of infinity scroll. How add infinity to Up scroll and insert rows at beginning: rows.insert(contentsOf: Array(repeating: "Item 0", count: 20), at: 0) Like apple do this trick in calendar. struct Screen: View { @State var rows: [String] = Array(repeating: "Item", count: 20) private func getNextPageIfNecessary(encounteredIndex: Int) { guard encounteredIndex == rows.count - 1 else { return } rows.append(contentsOf: Array(repeating: "Item", count: 20)) } var body: some

问题 why if i using onScroll react version 16 cannot fire how to make it work. because i want using onScroll than onWheel?. import ReactDom from 'react-dom' constructor(props) { super(props); this._fireOnScroll = this.fireOnScroll.bind(this); } fireOnScroll() { console.log('Fire!'); } componentDidMount() { const elem = ReactDOM.findDOMNode(this.refs.elementToFire); elem.addEventListener('scroll', this._fireOnScroll, true); } componentWillUnmount() { const elem = ReactDOM.findDOMNode(this.refs

问题 How are the 'units' ( what ) from the Tkinter canvas scrolling methods xview(SCROLL, step, what) and yview(SCROLL, step, what) defined? Is it defined in pixels? Is it possible to change it (for a slower scrolling for example)? For a better context please see the code here. Thanks in advance. 回答1: for slower scrolling, you can play around with the xscrollincrement & yscrollincrement options of the Canvas: from Tkinter import * root = Tk() c = Canvas(root, scrollregion=(0,0,500,500), height=200

问题 I have a scrollable textView, and I want to limit the number of lines displayed, however xml properties are not working : <TextView android:id="@+id/tv_addesc" android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="vertical" android:maxLines="12" android:textColor="#FFFFFFFF" android:textSize="15sp" /> the number of lines displayed is 50 and there are 900 chars in the text. How can I limit the number of lines displayed and make it scrollable ? Edit : I

问题 I have a scrollable textView, and I want to limit the number of lines displayed, however xml properties are not working : <TextView android:id="@+id/tv_addesc" android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="vertical" android:maxLines="12" android:textColor="#FFFFFFFF" android:textSize="15sp" /> the number of lines displayed is 50 and there are 900 chars in the text. How can I limit the number of lines displayed and make it scrollable ? Edit : I

问题 I have a scrollable textView, and I want to limit the number of lines displayed, however xml properties are not working : <TextView android:id="@+id/tv_addesc" android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="vertical" android:maxLines="12" android:textColor="#FFFFFFFF" android:textSize="15sp" /> the number of lines displayed is 50 and there are 900 chars in the text. How can I limit the number of lines displayed and make it scrollable ? Edit : I

问题 I'm using Selenium on python and I would like to scroll to an element to click on it. Everywhere I see that the rigth things to do to go directly to the element is to use : driver = webdriver.Chrome() driver.get(url) element = driver.find_elements_by_class_name('dg-button') driver.execute_script("return arguments[0].scrollIntoView();", element) But I have this error : "javascript error: arguments[0].scrollIntoView is not a function". What to I do wrong ? Thanks 回答1: Please use the line of

问题 I have a Google Sheet that accumulates up to 100 entries per day. As users add new entries, the script puts new data into the last row (see snippet below). However, there are only 12 rows visible on the screen, so once those are filled, the user can't see new entries. How can I make the last row visible to the user each time data is entered? I am new to google-apps-script, so thanks for any ideas. I believe onEdit trigger no longer works with sheet.setActiveRange() , so I am looking for a

问题 I would like to determine if a 'scrollable' widget indeed needs to scroll. I would ultimately like to show something like 'Scroll for more'. How do I achieve this? I could use a combination of LayoutBuilder and a ScrollController. However, ScrollController gives me maxScrollExtent and minScrollExtent only after any event - like say for example user trying to scroll I would like to know during 'build' so that I can determine to show 'Scroll for more' or not depending on the screen dimensions

问题 I would like to determine if a 'scrollable' widget indeed needs to scroll. I would ultimately like to show something like 'Scroll for more'. How do I achieve this? I could use a combination of LayoutBuilder and a ScrollController. However, ScrollController gives me maxScrollExtent and minScrollExtent only after any event - like say for example user trying to scroll I would like to know during 'build' so that I can determine to show 'Scroll for more' or not depending on the screen dimensions