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Flutter ListView lazy loading in both directions (up, down)

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问题 I would like to have a ListView in flutter which provides lazy loading in both directions (up, down). Example: There are 60000 items in the backend database which can be theoretically displayed. First I want to display the items 100..120 From these indices I want to be able to scroll up and down while lazy loading the new items Things to consider: The top and bottom edge (current index < 0 or > 60000) should be bouncing if reached while scrolling What I've tried: Most of the approaches in

Flutter ListView lazy loading in both directions (up, down)

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Put the Scroll View under the Up and Down Button

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问题 I want to show the scrollView under the Up and Down button as show in picture. And after taping on up and down arrow scroll bar should be scroll and after long press on the up and down button it should be scrolled continue till the end point. Please tell me how we can Implement this. Thanks in Advance. 回答1: Perform ScrollView .pageScroll() or ScrollView.smoothScrollBy() on the tap event of the button. Use a Runnable to continues invoke ScrollView.scrollBy() when long press event happens. I

stm32 how to make pulse count up/down with timer

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问题 I need for my personal project counting pulse and direction with timer. With this code I can count only one direction. Any suggestion are welcome for correct code (this code is pretesting) pulse count to PA_9 and direction input to PA_8 #include "mbed.h" #include "stm32f4xx.h" #include "stm32f4xx_hal_tim_ex.h" TIM_HandleTypeDef timer; TIM_Base_InitTypeDef inizializza; TIM_IC_InitTypeDef startclock; TIM_ClockConfigTypeDef ClockConfig; TIM_SlaveConfigTypeDef sSlaveConfigure; TIM

Slide up and Slide down animation on Webview in Android

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问题 i have a list of chapters in a list.when user selects a chapter it get expanded and sub topics in that chapter lists. when user select the particular sub topic its contents get loaded in webview on new screen. its all done fine. But i want some functionality on webview. When user slide up the webview, webview should move up side and a new webview from bottom to upside should appear on screen (slide up animation on webview) with next subtopics contents. same in case of slide down when user

Slide up and Slide down animation on Webview in Android

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i have a list of chapters in a list.when user selects a chapter it get expanded and sub topics in that chapter lists. when user select the particular sub topic its contents get loaded in webview on new screen. its all done fine. But i want some functionality on webview. When user slide up the webview, webview should move up side and a new webview from bottom to upside should appear on screen (slide up animation on webview) with next subtopics contents. same in case of slide down when user slides down web view with previous subtopics contents. Please help how to provide slide up and slide down

Where is the WPF Numeric UpDown control?

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Getting into the first serious WPF project. It seems like there are a lot of basic controls flat out missing. Specifically, I am looking for the Numeric UpDown control. Was there an out of band release that I missed? Really don't feel like writing my own control. I do not want to use the WindowsFormHost and plop a WinForm ctl on it. I want it to be fully WPF without any legacy junk. Thanks Simply use the IntegerUpDown control in the xtended wpf toolkit You can use it like this: Add to your XAML the following namespace: xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit" In your XAML where

Where is the WPF Numeric UpDown control?

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问题 Getting into the first serious WPF project. It seems like there are a lot of basic controls flat out missing. Specifically, I am looking for the Numeric UpDown control. Was there an out of band release that I missed? Really don\'t feel like writing my own control. I do not want to use the WindowsFormHost and plop a WinForm ctl on it. I want it to be fully WPF without any legacy junk. Thanks 回答1: Simply use the IntegerUpDown control in the xtended wpf toolkit You can use it like this: Add to