listview

问题 I'm new to PyQt. So I'm trying to get selected item from QListView, I'm able to get selected items's index, but I'm not able to get the value of the index, can please someone help me. Here is the code : import sys import os from PyQt4 import QtCore, QtGui from PyQt4.QtCore import * from PyQt4.QtGui import * class asset(QtGui.QDialog): def __init__(self,parent=None): super(asset, self).__init__(parent) self.assetList = QtGui.QListView(self) self.assetList.clicked.connect(self.on_treeView

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

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

问题 I have a list of locations I retrieve and display in a Listview Builder. Each location has a latitude and longitude value. Am now trying to include a "distance" field to the Listview using the GeoLocator Plugin (https://pub.dartlang.org/packages/geolocator) - by having a "Find Nearest" button that gets the user location, then calculates the distance using the user's lat/lon and each location's lat/lon. Since the "GeoLocator Calculate Distance Method" is asynchronous, I can't insert Geolocator

问题 I have a AlertDialog of Multichoice Items.I want to have an EditText beside each item. How do i achieve this? third_card.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final AlertDialog.Builder mBuilder = new AlertDialog.Builder(EnterRecordActivity.this); mBuilder.setTitle("Select Contributor"); mBuilder.setMultiChoiceItems(listMembers, checkedMembers, new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface

问题 There are ListViews in some activities of my app. Since Android 2.1 or 2.2 scrollbars will be only displayed if the user scroll the list or for very short time at the beginning. Then scrollbars will disappear. Is it possible somehow to show them always as for example in Android 1.5? 回答1: In your xml set android:fadeScrollbars="false" 回答2: You can accomplish this with the method setScrollbarFadingEnabled() on the View object. 来源： https://stackoverflow.com/questions/5978587/always-show

问题 There are ListViews in some activities of my app. Since Android 2.1 or 2.2 scrollbars will be only displayed if the user scroll the list or for very short time at the beginning. Then scrollbars will disappear. Is it possible somehow to show them always as for example in Android 1.5? 回答1: In your xml set android:fadeScrollbars="false" 回答2: You can accomplish this with the method setScrollbarFadingEnabled() on the View object. 来源： https://stackoverflow.com/questions/5978587/always-show

问题 There are ListViews in some activities of my app. Since Android 2.1 or 2.2 scrollbars will be only displayed if the user scroll the list or for very short time at the beginning. Then scrollbars will disappear. Is it possible somehow to show them always as for example in Android 1.5? 回答1: In your xml set android:fadeScrollbars="false" 回答2: You can accomplish this with the method setScrollbarFadingEnabled() on the View object. 来源： https://stackoverflow.com/questions/5978587/always-show

问题 from documentation: onEndReachedThreshold number Threshold in pixels (virtual, not physical) for calling onEndReached. so I just wanted to know what it means, is it threshold from the top, or is it threshold from the bottom. From the top? - if I set a value of onEndReachedThreshold ={10}, is my onEndReached called as soon as I scrolled to 10 pixel, or something else. From the bottom? - if I set value of onEndReachedThreshold ={listview height -10}, will my onEndReached called as soon as I

问题 I'm trying to center an item within a horizontal listView when selected. My current strategy is to first measure the item and scroll to the x coordinates of the referenced item within the view. Currently, any time I press an item ListView scrolls to the very end x: 538 Is there an easier way to implement this while keeping the code stateless / functional? const ItemScroll = (props) => { const createItem = (obj, rowID) => { const isCurrentlySelected = obj.id === props.currentSelectedID