data-binding

问题 I migrated a project to androidx. I changed the xml-files by hand an I also set the imports manually, where Android Studio wasn't successful. When I try to rebuild the project, the following error occurs in the compiled file DataBinderMapperImpl.java The head of this file: package com.xxxx.todo; import android.util.SparseArray; import android.util.SparseIntArray; import android.view.View; import androidx.databinding.DataBinderMapper; import androidx.databinding.DataBindingComponent; import

问题 I am using Xamarin.forms.Maps for showing the map in my project. The map is inside the ListView and I need to bind the coordinate positions to the map. Model Class: public class History { public double Latitude { get; set; } public double Longitude { get; set; } } Data adding part: historyList.Add(new History() { Latitude= -28.854930 ,Longitude= 151.166023 }); historyList.Add(new History() { Latitude = -28.853671, Longitude = 151.165712 }); historyList.Add(new History() { Latitude = -28

问题 I have a TreeView with a custom resource dictionary for its TreeViewItems template. I need to be able to programatically change the template for each TreeViewItem based on its binding's value. As far as I can tell, I can't access the binding from the ResourceDictionary xaml. I think I need to extend the TreeView with my own userControl, but I'm not sure what I need to actually add to it to achieve what I want. Thanks in advance. <TreeView Name="dirTree" AlternationCount="2" Background="

问题 I am attempting to create a databinding between a numericupdown and an array element. In my form I have tried creating the binding shown below, but it doesn't seem to work. Any help would be appreciated. Binding: nudTest.DataBindings.Add("Value", eac.ESettings.HsvArray[0], "", false,DataSourceUpdateMode.OnPropertyChanged); Array: public class ESettings : INotifyPropertyChanged { private int[] hsvArray = new int[6]; public event PropertyChangedEventHandler PropertyChanged; [XmlIgnore] public

问题 If one binds to a listbox's ItemsSource to a list type structure such as an ObservableCollection (or any value-only container really) with the type of a class ( List< MyClass> ) one can access the properties of said class. But if one has a Dictionary<long, MyClass> and binds the itemssource to Dictionary.Values one can not access the class properties anymore. So basically this is my XAML <ListBox ItemsSource="{Binding bm.Values}"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel> <TextBlock

问题 I have binded TextBlock text to a string property. Xaml look like: <TextBlock Text="{Binding Message}" TextWrapping="Wrap"/> Property on the ModelView class look like: private string message; public string Message { get { return message; } set { message = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Message))); } } I want to be able to use Textblock formatting abilities such as bold. for example: Message = "Some string with <Bold>bold</Bold> words"; On run time

问题 I want to create an "inflateWhen" BindingAdapter and attach it to a viewstub to have it inflate when a boolean value is true. However, the BindingAdapter keeps trying to operate on the root view of the viewstub, causing it to fail to compile. Is there any way to do this as a bindingadapter rather than having to do it programmatically in the activity? Here's what I have so far: @BindingAdapter("inflateWhen") fun inflateWhen(viewstub: ViewStub, inflate: Boolean) { if (inflate) { viewstub

问题 Hello I am developing one wpf application. I am using datagrid from wpf toolkit. I am binding grid by provider item source from database. it works fine. Now i want to add button in first row in some column, so is there any way to add button ? 回答1: <DataGrid Name="dgtest"> <DataGrid.Columns> <DataGridTemplateColumn> <DataGridTemplateColumn.CellTemplate> <DataTemplate> <Button x:Name="button" Content="click me" Visibility="Collapsed" /> <DataTemplate.Triggers> <DataTrigger Binding="{Binding

问题 TL;DR Can't seem to use binding to tell wrapped AVPlayer to stop — why not? The "one weird trick" from Vlad works for me, without state & binding, but why? See Also My question is something like this one but that poster wanted to wrap an AVPlayerViewController and I want to control playback programmatically. This guy also wondered when updateUIView() was called. What happens (Console logs shown below.) With code as shown here, The user taps "Go to Movie" MovieView appears and the vid plays

问题 Is it possible to automatically bind a Dictionary to a Gridview? The closest I've got is: Dictionary<string, myObject> MyDictionary = new Dictionary<string, myObject>(); // Populate MyDictionary here. Grid1.DataSource = MyDictionary.Values; Grid1.DataBind(); This binds the properties in myObject to the gridview, but I'd like to get the key as well. If it's not possible, is there an alternative, e.g. use a repeater? Thanks. 回答1: You can use: var data = MyDictionary.Select(x => new List<object>