I have the following two event handlers for an EditText field, the first one works but the second one did not. I will rather have the second one working because the first event handler requires that the user press the enter key which I suspect not every one will do.
First and working
private decimal paidAmount;
private EditText EditTextPaidAmount;
EditTextPaidAmount = RootView.FindViewById<EditText>(Resource.Id.editTextAmountPaid);
EditTextPaidAmount.KeyPress += (object sender, View.KeyEventArgs e) =>
{
e.Handled = false;
if (e.Event.Action == KeyEventActions.Down && e.KeyCode == Keycode.Enter)
{
paidAmount = Decimal.Parse(EditTextPaidAmount.Text);
RenderInvoiceTotals();
e.Handled = true;
}
};
This here is not working, it throws a System.FormatException "Invalid character at position 0"
EditTextPaidAmount = RootView.FindViewById<EditText>(Resource.Id.editTextAmountPaid);
EditTextPaidAmount.TextChanged += (object sender, Android.Text.TextChangedEventArgs e) =>
{
paidAmount = Decimal.Parse(EditTextPaidAmount.Text, CultureInfo.InvariantCulture);
RenderInvoiceTotals();
};
Maybe you could try using Decimal.TryParse instead?
This code works for me:
edit.TextChanged += (sender, args) =>
{
decimal decimalValue;
var isDecimal = Decimal.TryParse(edit.Text, out decimalValue);
if (isDecimal)
text.Text = decimalValue.ToString();
};
Is the exception coming from RenderInvoiceTotals?
Set the inputType property of the EditText to numberDecimal.
OR
Use Decimal.TryParse to parse the EditText value.
Because the error you have mentioned usually appears due to the parsing of string values to decimal.
Try using EditorAction event
EditTextPaidAmount.EditorAction += (sender, e) =>
{
e.Handled = false;
if (e.ActionId == ImeAction.Send)
{
DoStuff();
e.handled = true;
}
};
http://forums.xamarin.com/discussion/3686/edittext-setoneditoractionlistener-is-this-supported
Related
I have a modal view, in which I have multiple Entry fields that I through an iOS customrenderer have customized to change BorderColor when Focused.
When i pop my modal view on button press:
await Navigation.PopModalAsync(true);
I get a nullreference in my iOS customrenderer, because I guess the element suddently becomes null, and i somehow haven't told it, that the view is gone.
public class BorderColorChange : EntryRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
if (Control != null)
{
Control.Layer.BorderWidth = 1;
Control.Layer.CornerRadius = 4;
e.NewElement.Focused += (sender, evt) =>
{
Control.Layer.BorderColor = UIColor.FromRGB(3, 169, 244).CGColor;
};
e.NewElement.Unfocused += (sender, evt) =>
{
Control.Layer.BorderColor = UIColor.LightGray.CGColor;
};
};
}
}
I've noticed, that when i remove the await keyword from Navigation.PopModalAsync(true); it doesn't produce the error.
Any help on how to solve this error?
It is perfectly normal for OnElementChanged to be called with e.NewElement==null. This just means that the element is being removed (like when you await the PopModelAsync), so it should handle the change that the new element to associate with is null.
With custom renderers, you need to both subscribe and unsubscribe to events when changes occur in associating your custom renderer with a native control. So for example:
public class BorderColorChange : EntryRenderer
{
private void MyFocusedEventHandler(...) ...
private void MyUnfocusedEventHandler(...) ...
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
if (Control != null)
{
Control.Layer.BorderWidth = 1;
Control.Layer.CornerRadius = 4;
if (e.OldElement != null) // unsubscribe from events on old element
{
e.OldElement.Focused -= MyFocusedEventHandler;
e.OldElement.Unfocused -= MyUnfocusedEventHandler;
}
if (e.NewElement != null) // subscribe to events on new element
{
e.NewElement.Focused += MyFocusedEventHandler;
e.NewElement.Unfocused += MyUnfocusedEventHandler;
}
}
}
}
The logic for what to do when the entry gets/loses focus goes into the MyFocusedEventHandler/MyUnfocusedEventHandler rather than inline to allow for both subscribing and unsubscribing.
I am creating an outlook plugin that opens a SharePoint Calendar event for editing. The SharePoint Calendar is added to outlook as an overlay.
When clicking on the series event and editing a series everything works fine. But when I select just this one (occurrence). I am unable to get any of the properties for the AppointmentItem object.
I have tried both the ReadComplete and the Open events and still get an exception:
Exception from HRESULT: 0x80040108" and I am unable to access the
Parent. It appears all of the properties are null except Class = 26
and MessageClass = "IPM.Appointment"
private void Application_ItemLoad(object item)
{
_item = item;
try
{
if (!(item is AppointmentItem) || !_exp.CurrentFolder.Name.Contains("Test - Conference Room ")) return;
_warnUser = true;
_apptItem = (AppointmentItem) item;
_apptItem.ReadComplete += test;
_apptItem.Open += McAI_Open;
}
catch (Exception ex)
{
var expMessage = ex.Message;
MessageBox.Show(expMessage);
}
}
private static void ThisAddIn_Shutdown(object sender, EventArgs e)
{
// Note: Outlook no longer raises this event. If you have code that
// must run when Outlook shuts down, see https://go.microsoft.com/fwlink/?LinkId=506785
}
private void McAI_Open(ref bool cancel)
{
_warnUser = false;
var conferenceRoom = _exp.CurrentFolder.Name;
conferenceRoom = conferenceRoom.Replace("Test - ", "");
if (!(_item is AppointmentItem)){return;}
try
{
var g = _apptItem.IsRecurring;
if (_apptItem != null && _exp.CurrentFolder.Name.Contains("Test") && _apptItem.Location != null)
{
var location = _apptItem.Location;
var result = location.Substring(location.LastIndexOf(':') + 1);
cancel = true;
var sharePointItemId = int.Parse(result);
var frm = new FrmCalendarSelection(
"<SharePointURL>" + conferenceRoom,
sharePointItemId);
frm.Show();
frm.Closed += Frm_Closed;
}
else if (_apptItem != null && _exp.CurrentFolder.Name.Contains("Test") && _apptItem.Location == null)
{
cancel = true;
var frm = new FrmCalendarSelection(
"<SharePointURL>" + conferenceRoom);
frm.Show();
frm.Closed += Frm_Closed;
}
}
catch (Exception e)
{
throw e;
}
}
My borderless custom renderer for picker
public class BorderlessPickerRenderer : PickerRenderer
{
public static void Init() { }
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
Control.Background = null;
}
}
}
It will change the picker list text color as white. please see the screenshot
If you check the source code of PickerRenderer, you will find that the Dialog is totally generated in the code behind.
So here to set a Transparent(border-less) background, we can re-write the Click event of this control, for example:
public class BorderlessPickerRenderer : Xamarin.Forms.Platform.Android.PickerRenderer
{
private IElementController ElementController => Element as IElementController;
private AlertDialog _dialog;
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
base.OnElementChanged(e);
if (e.NewElement == null || e.OldElement != null)
return;
Control.Click += Control_Click;
}
protected override void Dispose(bool disposing)
{
Control.Click -= Control_Click;
base.Dispose(disposing);
}
private void Control_Click(object sender, EventArgs e)
{
Picker model = Element;
var picker = new NumberPicker(Context);
if (model.Items != null && model.Items.Any())
{
picker.MaxValue = model.Items.Count - 1;
picker.MinValue = 0;
picker.SetDisplayedValues(model.Items.ToArray());
picker.WrapSelectorWheel = false;
picker.DescendantFocusability = DescendantFocusability.BlockDescendants;
picker.Value = model.SelectedIndex;
}
var layout = new LinearLayout(Context) { Orientation = Orientation.Vertical };
layout.AddView(picker);
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, true);
var builder = new AlertDialog.Builder(Context);
builder.SetView(layout);
builder.SetTitle(model.Title ?? "");
builder.SetNegativeButton(global::Android.Resource.String.Cancel, (s, a) =>
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
// It is possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
_dialog = null;
});
builder.SetPositiveButton(global::Android.Resource.String.Ok, (s, a) =>
{
ElementController.SetValueFromRenderer(Picker.SelectedIndexProperty, picker.Value);
// It is possible for the Content of the Page to be changed on SelectedIndexChanged.
// In this case, the Element & Control will no longer exist.
if (Element != null)
{
if (model.Items.Count > 0 && Element.SelectedIndex >= 0)
Control.Text = model.Items[Element.SelectedIndex];
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
// It is also possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
}
_dialog = null;
});
_dialog = builder.Create();
_dialog.DismissEvent += (ssender, args) =>
{
ElementController?.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
};
_dialog.Show();
_dialog.Window.SetBackgroundDrawable(new ColorDrawable(Android.Graphics.Color.Transparent));
}
}
Rendering image of this custom picker:
The font color and button's style can be modified as you need since you created this dialog by yourself. And the style of the dialog also depends on the style of your app.
I am following around on a kindle book I bought for developing metro apps. For some reason I cannot set the text value of a text box in a method outside the OnNavigatedTo method. This is the code that the book provides:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
//passed in the view model
viewModel = e.Parameter as ViewModel;
this.DataContext = viewModel;
viewModel.PropertyChanged += (sender, eventArgs) =>
{
if (eventArgs.PropertyName == "SelectedItemIndex")
{
if (viewModel.SelectedIndex == -1)
{
SetItemDetail(null);
}
else
{
SetItemDetail(viewModel.GroceryList[viewModel.SelectedIndex]);
}
}
SetItemDetail(viewModel.GroceryList[viewModel.SelectedIndex]);
};
}
private void SetItemDetail(GroceryItem item)
{
ItemDetailName.Text = "test"; //(item == null) ? "" : item.Name;
ItemDetailQuantity.Text = "test"; //(item == null) ? "" : item.Quantity.ToString();
//if (item != null)
//{
// ItemDetailStore.SelectedItem = item.Store;
//}
//else
//{
// ItemDetailStore.SelectedIndex = -1;
//}
}
I have commented parts out in the set item detail method, but I still cannot set the value of a textbox when I click it (this is supposed to be the behavior). I have used break points and the property of the textbox is getting set, however, it is not displayed on screen.
Thanks.
I'm using this to make a web request and download some data:
public partial class MainPage : PhoneApplicationPage
{
public MainPage()
{
InitializeComponent();
var client = new WebClient();
client.DownloadStringCompleted += (s, e) => {
textBlock1.Text = e.Result;
};
client.DownloadStringAsync(new Uri("http://example.com"));
}
}
The text of textBlock1 never changes even though e.Result has the correct data. How do I update that from the callback?
Edit: If I add MessageBox.Show(e.Result); in the callback along with the textBlock1.Text assignment, both the messsage box and the text box show the correct data.
Edit Again: If I add a TextBox and set it's text right after the line textBlock1.Text line, they both show the correct text.
I think, it's a bug.
I also ran into some problems with updating the UI from different dispatchers. What I finally did was use the TextBlock's (or other UI Element) own dispatcher and that worked for me. I think the phone framework may be using different dispatchers between the app and UI Elements. Notice the change from dispatcher.BeginInvoke to textbox1.Dispatcher...
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
var dispatcher = Deployment.Current.Dispatcher;
var client = new WebClient();
client.DownloadStringCompleted += (s, e) =>
{
var result = e.Result;
textBlock1.Dispatcher.BeginInvoke(
()=> textBlock1.Text = result
);
};
client.DownloadStringAsync(new Uri("http://example.com"));
}
From browsing through the WP7 forums, a bunch of people were reporting that this was related to a video card driver issue. I've updated my ATI Radeon HD 3400 drivers to the latest version and it appears to work now.
client.DownloadStringAsync is expecting a Uri like this:
client.DownloadStringAsync(new Uri("http://example.com"));
also, shouldn't you update your TextBlock through a Dispatcher.BeginInvoke like this:
client.DownloadStringCompleted += (s, e) =>
{
if (null == e.Error)
Dispatcher.BeginInvoke(() => UpdateStatus(e.Result));
else
Dispatcher.BeginInvoke(() => UpdateStatus("Operation failed: " + e.Error.Message));
};
public partial class MainPage : PhoneApplicationPage
{
public MainPage()
{
InitializeComponent();
Loaded += MainPage_Loaded;
}
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
var dispatcher = Deployment.Current.Dispatcher;
var client = new WebClient();
client.DownloadStringCompleted += (s, e) =>
{
var result = e.Result;
dispatcher.BeginInvoke(
()=> textBlock1.Text = result
);
};
client.DownloadStringAsync(new Uri("http://example.com"));
}
}
I want to comment but can't yet. Yes, I have a very similar issue. In my case it's my viewmodel that is updating a DownloadStatus property, then when the download is completed I do some more work and continue updating this property.
The view stops updating once the ViewModel code hits the OpenReadCompleted method. I've stepped carefully through the code. PropertyChanged fires, and the view even comes back and retrieves the new property value, but never shows the change.
I was sure it was a bug, but then I created a brand new project to reproduce the issue, and it works fine!
Here's a snippet of my non-reproducing code. The UI textblock bound to "DownloadStatus" happily updates properly all the way through. But the same paradigm doesn't work in my main project. Infuriating!
public void BeginDownload(bool doWorkAfterDownload)
{
DownloadStatus = "Starting ...";
_doExtraWork = doWorkAfterDownload;
var webClient = new WebClient();
string auth = "Basic " + Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes("test:password"));
webClient.Headers["Authorization"] = auth;
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
webClient.OpenReadAsync(new Uri("http://www.ben.geek.nz/samsung1.jpg"));
}
void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
if (e.Error != null)
{
DownloadStatus = e.Error.Message;
return;
}
DownloadStatus = "Completed. Idle.";
if(_doExtraWork)
{
Thread t = new Thread(DoWork);
t.Start(e.Result);
}
}
void DoWork(object param)
{
InvokeDownloadCompleted(new EventArgs());
// just do some updating
for (int i = 1; i <= 10; i++)
{
DownloadStatus = string.Format("Doing work {0}/10", i);
Thread.Sleep(500);
}
DownloadStatus = "Completed extra work. Idle.";
InvokeExtraWorkCompleted(new EventArgs());
}