listview

QML ListView populate opacity animation

由 半腔热情 提交于 2020-04-17 22:08:27
问题 I have a ListView and I want to create an fade-in effect for populate ViewTransition. But it not works as expected. It seems that initial opacity of the delegate is 1.0 and so I need to set from property of the animation. But it looked like a flashing. So I need to set initial opacity value of my delegate to 0.0 . Now I have a new problem... when I flick the list, delegates default opacity is 0.0 and so they are invisible. So my question: Can anybody create a perfect fade-in animation for

Upload images with fileupload within a Listview asp.net

由 半腔热情 提交于 2020-04-16 06:31:31
问题 I am creating a project with players and basketball teams with forms. I use listview (asp.net). I want to have an upload event on edititem and insertitem . I want to upload images to ~/images/ with the file name "SURNAME" (Column from databse) + ".jpg . Only that My ASP code from players.asp file is: <asp:ListView ID="ListView1" runat="server" DataKeyNames="ID,IDOTEAM,IDOCOUNTRY" DataSourceID="SqlDataSource1" InsertItemPosition="LastItem"> <AlternatingItemTemplate> <tr style="background-color

Upload images with fileupload within a Listview asp.net

由 白昼怎懂夜的黑 提交于 2020-04-16 06:31:20
问题 I am creating a project with players and basketball teams with forms. I use listview (asp.net). I want to have an upload event on edititem and insertitem . I want to upload images to ~/images/ with the file name "SURNAME" (Column from databse) + ".jpg . Only that My ASP code from players.asp file is: <asp:ListView ID="ListView1" runat="server" DataKeyNames="ID,IDOTEAM,IDOCOUNTRY" DataSourceID="SqlDataSource1" InsertItemPosition="LastItem"> <AlternatingItemTemplate> <tr style="background-color

android（4）事务处理，ContentProvider，ListView

由 假装没事ソ 提交于 2020-04-12 17:44:30
一.SQLite数据库 * 1.事务 beginTransaction(); // 开始事务 setTransactionSuccessful(); // 设置成功点, 在事务结束时, 成功点之前的操作会被提交 endTransaction(); // 结束事务, 通常放在finally中, 如果不显示关闭事务, 超市也会关闭, 但效率较低 * 2.另一种增删改查 SQLiteDatabase类中有insert(), delete(), update(), query()四个方法, 不用写SQL语句, 通过参数拼装得到SQL 通常使用在ContentProvider 二.ListView 1.三种Adapter构建ListView ListView添加条目的时候, 可以使用setAdapter(ListAdapter)方法, 常用的ListAdapter有三种 BaseAdapter: 定义一个类继承BaseAdapter, 重写4个抽象方法, ListView的条目是由getView()方法构建出来的 SimpleAdapter: 创建SimpleAdapter对象时, 传入数据(List<Map<String, ?>>), 并指定数据的绑定关系 SimpleCursorAdapter: 创建SimpleCursorAdapter对象时, 传入一个Cursor,

Flutter. How to expand first child of row to listview height as second child?

由 匆匆过客 提交于 2020-04-12 02:28:49
问题 My example code: Row( children: <Widget>[ Container( color: Colors.red, child: Text('text'), ), Expanded( child: Container( color: Colors.green, child: ListView( shrinkWrap: true, children: <Widget>[ ListTile( title: Text('Title1'), ), ListTile( title: Text('Title2'), ) ], ), ), ) ], ) How to expand first Container to Listview height? I tried IntrinsicHeight, but it do not works with listview. 回答1: Assign a list controller to the list and use its position.viewportDimension property to get the

How to display a date like Whatsapp on scrolling ListView

由 ＊爱你＆永不变心＊ 提交于 2020-04-11 11:36:10
问题 How can I show dates in an app when I scroll the ListView like in WhatsApp? See the below image for clarity: When I scroll the ListView, the date gets displayed over the list. If you still did not understand my question please open your WhatsApp, go to any group & start scrolling: you will see the date getting displayed for older texts. 回答1: To show date like this screenshot, you can use val firstVisiblePosition = layoutManager.findFirstVisibleItemPosition() if (getDateFromFirebaseTime

ListView.getCheckedItemPositions not able to return checked Items in SparseBooleanArray

由 半城伤御伤魂 提交于 2020-04-10 18:09:30
问题 I m trying to read the contacts in a list with multiple checkboxes , but when i call the sparsebooleanarray ..it just return false for all the list entries,..even for the one s checked ...I looked into this thread Why is ListView.getCheckedItemPositions() not returning correct values? ...But when i implement the addClickHandlerToCheckBox it force stops..this has been bugging me for 4 days..please any help.. public void populateContactList() { // Build adapter with contact entries final Cursor

Observablecollection not updating list, when an item gets added

由 让人想犯罪 __ 提交于 2020-04-10 13:51:46
问题 I'm using the MVVM pattern and want to update a ListView using an observable collection. I went through several SO questions, but cannot see what I'm doing wrong. Any help is much appreciated. Thanks. View.xaml Namespace: xmlns:local="clr-namespace:MusicPlayer.ViewModel" DataContext <UserControl.DataContext> <local:AllTracksViewModel/> </UserControl.DataContext> ListView <ListView x:Name="TrackListView" ItemsSource="{Binding Path=TrackListObservable}"> ... <ListView.View> <GridView>

Observablecollection not updating list, when an item gets added

由 纵饮孤独 提交于 2020-04-10 13:50:50
问题 I'm using the MVVM pattern and want to update a ListView using an observable collection. I went through several SO questions, but cannot see what I'm doing wrong. Any help is much appreciated. Thanks. View.xaml Namespace: xmlns:local="clr-namespace:MusicPlayer.ViewModel" DataContext <UserControl.DataContext> <local:AllTracksViewModel/> </UserControl.DataContext> ListView <ListView x:Name="TrackListView" ItemsSource="{Binding Path=TrackListObservable}"> ... <ListView.View> <GridView>

android listView滑动停止后加载图片

由 ﹥＞﹥吖頭↗ 提交于 2020-04-09 12:15:19
解决思路：添加listView的滚动监听事件，在listView滚动时使加载图片线程处于等待状态。当停止活动后，获得当前界面的listView的开始位置和结束位置。然后开启加载图片线程。 代码片段： public AsyncImageLoader imageLoader; //声明图片加载类的对象 在getView中添加listView滑动监听事件 public AbsListView.OnScrollListener onScrollListener = new AbsListView.OnScrollListener() { public void onScrollStateChanged(AbsListView view, int scrollState) { switch (scrollState) { case AbsListView.OnScrollListener.SCROLL_STATE_FLING: imageLoader.lock();//处于滚动状态锁定加载线程 break; case AbsListView.OnScrollListener.SCROLL_STATE_IDLE: int start = listView.getFirstVisiblePosition();//得到listView当前屏的开始位置 int end = listView
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