Using MTD, I have created a UITableViewDelegate and attached it to the main TableView.
this.TableView.Delegate = new MyTableDelegate();
However at no time do any of the events on the delegate fire.
My goal is to dismiss the Keyboard when the user scrolls the table. (I'm open to other options)
//Never gets called
class MyTableDelegate:UITableViewDelegate
{
public override void DraggingStarted(UIScrollView scrollView)
{
HideKeyboard();
}
}
Related
I have an Android application with a dialog and a few buttons inside.
I want to reuse the dialog for different purposes and looking for a way to call the button from a separate class and define an action event for it.
Creating a test class, I managed to define an action event for a button inside a form, but the same code does not work for a button inside a dialog, and I can't get my head around why it is not working for the dialog.
Below is what I already have. Any suggestions would be appreciated.
public Class One {
Test test = new Test();
test.testOne(); // this is working : button prints
test.testTwo(); // this is not working : button does not print
buttonTest = test.getTestButton();
buttonTest.setText("Hello World"); // not working for a button in a dialog
buttonTest.addActionListener(l-> { // prints when the button in a Form
System.out.println("try"); // does not print when the button is in a dialog
});
}
public class Test {
Dialog dialog = new Dialog();
Form form = new Form();
Button button;
public void testOne() {
button = new Button("Test");
form.add(button);
form.show();
}
public void testTwo() {
button = new Button("Testing");
dialog.add(button);
dialog.show();
}
public Button getTestButton () {
return button;
}
}
You add the action listener after showing the form and dialog. This isn't a problem for the form since the forms show method will continue. But a dialogs show() method will block.
Two solutions:
Move the listener binding higher in the code (before the show) that would be a problem since the button doesn't exist yet so you will need some refactoring.
Change the show() call on the dialog to showModless()
I have a problem with a button in that it doesn't work on the first click. I have to click twice and it then gives double results:
Button button = new Button("Click Me");
button.addClickListener(
new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
new Thread(new Runnable() {
#Override
public void run() {
DateChooser dateChooser = new DateChooser(new com.kopiright.xkopi.lib.type.Date(2013, 12, 9));
System.out.println(dateChooser.selectDate(com.kopiright.xkopi.lib.type.Date.now()).toString());
}
}).start();
}
}
);
DateChooser extends com.vaadin.ui.Panel class.
Vaadin Button is always immediate so that's not the problem here.
The problem is that you are starting an external thread, which updates the UI, and to see changes made to the UI by an external thread, you should use pollig or pushing. In this case the second button click polls the changes to the browser. But in this case you can just remove the thread:
button.addClickListener(new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
DateChooser dateChooser = new DateChooser(new com.kopiright.xkopi.lib.type.Date(2013, 12, 9));
System.out.println(dateChooser.selectDate(com.kopiright.xkopi.lib.type.Date.now()).toString());
}
});
And when an external thread is used to update Vaadin components, the code must be synchronized correctly.
Is there a reason you create a new thread for this?
Please be aware that modifying the GUI from a thread mus be synchronized.
Look in the book of vaadin for this:
11.16.3. Accessing UI from Another Thread
https://vaadin.com/de/book/vaadin7/-/page/advanced.push.html
André
I'm using Windows Azure Mobile Services to store and retrieve data in my Windows Phone 8 app. This is a bit of a complicated issue so I will do my best to explain it.
Firstly I'm using raw push notifications to receive a message and when it receives the message it updates a listbox in my app. When I open my app, navigate to the page with the ListBox and receive a push notification the ListBox updates fine. If I press back, then navigate to the same page with the ListBox, the push notification is received, the code to update the ListBox executes with no errors yet the ListBox doesn't update. I have checked that the same code runs using the OnNavigatedTo handler in both scenarios, but it seems like the ListBox does not bind correctly in the second instance when I press back and then re-navigate to the same page. Here are some code snippets:
MobileServiceCollection declarations:
public class TodoItem
{
public int Id { get; set; }
[JsonProperty(PropertyName = "text")]
public string Text { get; set; }
}
private MobileServiceCollection<ToDoItem, ToDoItem> TodoItems;
private IMobileServiceTable<TodoItem> todoTable = App.MobileService.GetTable<TodoItem>();
Push Notification Received Handler:
void PushChannel_HttpNotificationReceived(object sender, HttpNotificationEventArgs e)
{
string message;
using (System.IO.StreamReader reader = new System.IO.StreamReader(e.Notification.Body))
{
message = reader.ReadToEnd();
}
Dispatcher.BeginInvoke(() =>
{
var todoItem = new TodoItem
{
Text = message,
};
ToDoItems.Add(todoItem);
}
);
}
I have tried using:
ListItems.UpdateLayout();
and
ListItems.ItemsSource = null;
ListItems.ItemsSource = ToDoItems;
before and after the code in the above procedure that adds the ToDoItem but it didn't help.
The following procedure is called in my OnNavigatedTo event handler, and refreshes the Listbox and assigns ToDoItems as the items source:
private async void RefreshTodoItems()
{
try
{
ToDoItems = await todoTable
.ToCollectionAsync();
}
catch (MobileServiceInvalidOperationException e)
{
MessageBox.Show(e.Message, "Error loading items", MessageBoxButton.OK);
}
ListItems.ItemsSource = ToDoItems;
}
The above procedure is async but I have made sure it completes before receiving any notifications. Even so, as mentioned above when I open the app, navigate to the page that shows the ListBox it updates fine. When I press back, navigate to the same page again, it doesn't work. When I back out of the app, re-open it, navigate to the page with the ListBox, it works again, and then fails if I press back and re-open the page. So it seems the ListBox is not binding to ToDoItems correctly when I press back and navigate to the same page.
Any help appreciated. Thanks.
Can you modify your approach a bit to use Data Binding and the MVVM model to bind your model to your view.
It might look like a bit of effort initially but will save you a lot of debugging hours later on.
Just follow the below steps
Create a new class that implements INotifyPropertyChanged
Add the below method implementation
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (null != handler)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
Add public ObservableCollection<TodoItem> TodoItems{ get; private set; } and initialize it in the constructor.
Every PhoneApplicationPage has a DataContext member. Assing it to a singleton instance of the above class that you create.
In the XAML, add the property ItemsSource="{Binding TodoItems}" to the list.
In the DataTemplate of the list use ItemsSource="{Binding Text}" for the control you wish to display this value on. ( e.g. TextBlock )
Now whenever you add elements to the collection, it will be reflected in the UI, and vice-versa.
I have a radgrid, for date column i have created a custom user control for filtering. I need to create a close button to close the user control. There are no close events which i can call. I don't want to make visibility collapsed. I started with something below:
public partial class DateFilterControl : UserControl, IFilteringControl
{
public event CloseEventHandler Close;
public delegate void CloseEventHandler();
private void Button_Click(object sender, RoutedEventArgs e)
{
this.Close();
}
}
It is throwing nullreference exception which is obvious to come. What code do i need to put to close the user control?
use Messaging Service. With this you can close the window in ViewModel so no need to give close function in Backend. Add Command property to Cancel button
<Button Content="Cancel" Command="{Binding CancelCommand}"/>
Now in the ViewModel add the RelayCommand property in that add
Messenger.Default.Send<bool>(true, typeof(XViewModel));
Now in the BackEnd of this userControl adds following in the constructor.
Messenger.Default.Register<bool>(this, typeof(ScheduleViewModel), (b) =>
{
if (b == true)
{
this.DialogResult = true;
}
});
Now u can close the Window...
This will surely helps u...
I am working on a game where I am extending the view and performing operations in the class. I need to have a popup in the game which will have 3 buttons inside it. I have managed to have the popup show-up using custom dialogs but when I configure the onClick as follows:
private void popUp() {
Context mContext = getContext();
Dialog dialog = new Dialog(mContext);
dialog.setContentView(R.layout.custom_fullimage_dialog);
dialog.setTitle("Cheese Market");
Button one = (Button)findViewById(R.id.firstpack);
one.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
cheeseLeft = cheeseLeft + 10;
masterMoveLock = false;
return;
}
});
}
It force closes giving a nullpointerexeption even though it is defined in the custom_fullimage_dialog layout.
Can someone help me figure out how to have the button click detected in this scenario?
Thank you.
Try calling dialog.findViewById instead.
You're setting the contentView for the dialog, but by calling findViewById you're looking for it under your activity's content view.