I'm working on a WP8 app and want to hold a text in a textblock when I switch to another page.
So when I come back at the page with the textblock, the text must be still there.
Does anyone know a way for doing this?
Thanks
(Example is in C#, sorry ...)
One way of persisting data is to use Isolated Storage, specifically Application Settings. A simple example of how to do this is:
On the Page's "OnNavigatedFrom" event, add data to storage
On the Page's "OnNavigatedTo" event, retrieve from storage
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
// textBlock is a TextBlock defined in XAML.
if (!settings.Contains("userData"))
settings.Add("userData", textBlock.Text);
else
settings["userData"] = textBlock.Text;
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
if (settings.Contains("userData"))
textBlock.Text = (string)settings["userData"];
}
Related
I have 2 dropdowns (pickers) on a XAML form. The first is an ObservabelCollection of Territories. The second is an ObservableCollection of type Tracks. When the form loads my ViewModel loads both collections and each collection is bound to a picker. I want to filter and display only those tracks that are associated with the selected territory in the second picker.
FYI-the second picker is disabled until a selection is made in the first. Actually I don't require that the second picker's data source be set as the form loads, unless the solution requires it. The selection in the first picker will be the key to filter the data for the second.
I have tried to handle the filtering in the Territory picker's SelectedIndexChanged event but my ObservableCollection 'tracks' is not exposed here.
private void territoryPicker_SelectedIndexChanged(object sender, EventArgs e)
{
var picker = (Picker)sender;
string territory = picker.SelectedItem.ToString();
Tracks _track = tracks.Where(X => X.Territory = territory);<<<==== Does not work
trackPicker.ItemsSource = _track.Track;<<<==== Does not work
trackPicker.IsEnabled = true;
}
I've also tried to not build the Tracks OC until after the Territory is selected like this:
private void territoryPicker_SelectedIndexChanged(object sender, EventArgs e)
{
var picker = (Picker)sender;
string territory = picker.SelectedItem.ToString();
TrackViewModel vm = new TrackViewModel();
var _tracks = (Tracks)vm.Tracks; <<<<<==== This does not work
trackPicker.IsEnabled = true;
}
The ViewModel runs and the tracks are loaded via the API but when it returns here Tracks is empty.
I'm open to a reasonable solution (not 3rd party controls/packages) that will accomplish this task . Thanks
I figured it out by stumbling over the answer while researching another issue. I have been referencing my viewmodel in the {content].xaml page like this.
<ContentPage.BindingContext>
<vm:TrackViewModel />
</ContentPage.BindingContext>
When doing so the resources of that vm were not available in the code behind. But when I reference the VM in the page constructor Like this:
public partial class RequestmyTracks : ContentPage
{
TrackViewModel trackviewmodel = new TrackViewModel();
And then bind it here:
public RequestmyTracks()
{
InitializeComponent();
BindingContext = trackviewmodel;
}
The trackviewmodel is accessible in the SelectedIndexChanged event and everything else was really straight forward, Which looks like this:
private void territoryPicker_SelectedIndexChanged(object sender, EventArgs e)
{
var picker = (Picker)sender;
string territory = picker.SelectedItem.ToString();
ObservableCollection<Tracks> dah = (ObservableCollection<Tracks>)trackviewmodel.Tracks;
List<string> trackNames = new List<string>();
foreach (var track in dah)
{
if (track.Territory == territory)
trackNames.Add(track.Track);
}
trackPicker.ItemsSource = trackNames;
if(trackNames.Count ==1)
trackPicker.SelectedIndex = 0;
trackPicker.IsEnabled = true;
}
Thanks for the help
I want to add some custom code during the login function, in particular i want to redirect the user after login to the previous page.
For example: i'm on page A , i want to download something from this page, but i'm not authorized. Then pops a popup with link to the login page. After successful login i'm back on page A.
For this purpose i want to overwrite the LoginWidged and to set value to"this.DestinationPageUrl" dynamically.
I read about similar issues here and here, but there isn't an example how to overwrite this LoginWidget class.
I create CustomLoginControl.cs file in my project and register as a new custom control, but after rendering it on the page, it didn't work. Login button does not make nothing. I'm not sure what exactly have to do and which of methods have to overwrite.
namespace SitefinityWebApp.UserControls
{
public class CustomLoginControl : Telerik.Sitefinity.Web.UI.PublicControls.LoginWidget
{
protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
this.DestinationPageUrl = "http://previousPage.com";
base.Render(writer);
}
}
}
Can you give me an example how to overwrite this class to work properly.
Version: Sitefinity 5.0, Claims-based authentication
I've done something similar but instead of overriding the login control you can subscribe and capture the UnauthorizedAccess event, send the user to your login page with your redirect page as a query string parameter. You'll need to add a Global.asax / Global.asax.cs file to your project, then add this to the Application_Start function:
protected void Application_Start(object sender, EventArgs e)
{
Bootstrapper.Initialized += BootstrapperInitialized;
}
Then add these two functions:
private void BootstrapperInitialized(object sender, ExecutedEventArgs e)
{
if (e.CommandName == "Bootstrapped")
{
EventHub.Subscribe<IUnauthorizedPageAccessEvent>(OnUnauthorizedAccess);
}
}
private void OnUnauthorizedAccess(IUnauthorizedPageAccessEvent unauthorizedEvent)
{
var manager = ConfigManager.GetManager();
string loginPage = manager.GetSection<ProjectConfig>().DefaultSite.FrontEndLoginPageUrl;
var redirectParam = unauthorizedEvent.RedirectUrl.Replace(string.Format("{0}?ReturnUrl=", loginPage), string.Empty);
var escaped = Uri.EscapeDataString(redirectParam);
unauthorizedEvent.HttpContext.Response.Redirect(string.Format("{0}?ReturnUrl={1}", loginPage, escaped));
}
You will also need to set your default front end login page in the settings under Administration -> Settings -> Advanced -> Project -> DefaultSite and the FrontEndLoginPageUrl setting.
This works for me on a 6.3 site, not sure if this is available in Sitefinity 5 or not.
just got some Problems with Loading Xaml Files by Runtime.
For your Information my Code-Snippet to Load the File as Content of a Usercontrol:
public UserControl LoadXaml(FileInfo paramFile)
{
FileInfo _XamlFile = paramFile;
UIElement rootElement;
FileStream s = new FileStream(_XamlFile.FullName, FileMode.Open);
rootElement = (UIElement)XamlReader.Load(s);
s.Close();
UserControl uc = new UserControl();
if (rootElement.GetType() == typeof(Window))
{
uc.Content = (rootElement as Window).Content;
}
else
{
uc = rootElement as UserControl;
}
return uc;
}
private void lstPDFDokumente_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var _XamlFile = ((System.Windows.Controls.ListBox)sender).SelectedItem as FileInfo;
if (_XamlFile != null)
{
layoutGrid.Children.Clear();
System.Windows.Controls.UserControl rootElement;
rootElement = XamlController.LoadXaml(_XamlFile);
layoutGrid.Children.Add(rootElement);
}
}
This works fine while Events and x:Class="..." are deleted by hand.
The Problems I try to solve are:
If there is a x:Class="..." at the root element the XamlReader throws the first exception.
When the XamlReader reaches a Control which contains an event, for Example Click or TextChanged, it throws another Exception.
What i try to figure out is how to load a XamlFile, show it inside of a Control in the main Window and to show some of the attributes like Name,Height,Width and so on.
Just read dozens of Websites but never found a topic about to make a preview or things like that.
One of the solutions i tried is to read the Xaml File as XML and delete that code.
The Problem was to get a list of all possible Events in C#.
If there are some Questions to that Code, feel free to ask :)
Greetings
Daniel
I am completely new in Windowsphone7.i have develop sample application in that i want give the option to change the font-color,Size,style(Italic/Bold) as Dynamically(like RadEditor) .please help me how to resolve this option.
If you Develop your Application MVVM style then it is not so hard to do this. You just need a property for every setting you want to set dynamically and then bind to this properties. And you create a Settings View where you can set the properties and if you change them you use INotifyPropertyChanged to broadcast that your properties value changed and so every control which is bound to that property will change and redraw.
GalaSoft MVVM
MVVM Codeplex
Easy MVVM sample Application for Windows Phone 7
The link you found to save an image looks ok, but i did it a bit different, actually from the CameraCaptureTask you already get a WritableBitmap Image and you can save it like this.
To save the Image:
private void SaveToIsolatedStorage(WriteableBitmap image, string fileName)
{
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
if (myIsolatedStorage.FileExists(fileName))
{
myIsolatedStorage.DeleteFile(fileName);
}
using (var stream = myIsolatedStorage.OpenFile(fileName, FileMode.Create))
{
Extensions.SaveJpeg(image, stream, image.PixelWidth, image.PixelHeight,0, 100);
}
}
}
To read the Image:
private WritableBitmap ReadFromIsolatedStorage(string fileName)
{
WriteableBitmap bitmap = new WriteableBitmap(200,200);
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
if (store.FileExists(fileName))
{
using (var stream = store.OpenFile(fileName,FileMode.Open))
{
bitmap.SetSource(stream);
}}
}
return bitmap;
}
I hope this will work because i wrote it from scratch. :)
And in your ViewModel you should have a WritableBitmap Property which is bound to your Image Control on your View.
To use a lot of images and work with them you should read a bit more about this, because somehow SL Images use a lot of memory so you will need to address this problem somehow in the future.
I needed to add text to the AudienceEditor Control everywhere and so I created a custom
class inheriting from `Microsoft.Office.Server.WebControls.AudienceEditor` class
public class AudienceEditorText : Microsoft.Office.Server.WebControls.AudienceEditor
{
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
Label lblText = new Label();
lblText.ID = "Note";
lblText.Visible = true;
lblText.Text = "Text Needs to be changed";
lblText.Attributes.Add("style", "color: red");
Controls.Add(lblText);
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
}
protected override void CreateChildControls()
{
base.CreateChildControls();
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
}
}
and added the following tags in web.config
<tagMapping>
<add tagType="Microsoft.Office.Server.WebControls.AudienceEditor, Microsoft.Office.Server, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" mappedTagType="Hub.AudienceEditorProject.AudienceEditorText, Hub.AudienceEditorProject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=df1f6b11d06cf6ca" />
</tagMapping>
I was expecting the AudienceEditor control to be replaced by the new class in the EditForm.aspx and NewForm.aspx, but this is not working. I tried to debug the custom class, but execution doesn't enter the project, which means the AudienceEditor control doesn't get replaced.
The view source tells that the Audience field is rendered by the Microsoft.Office.Server.WebControls.FieldTypes.SPFieldTargetTo class, which contains the Microsoft.Office.Server.WebControls.FieldTypes.SpFieldTaretToControl, which in turn houses the AudienceEditor control. I have tried inheriting from all these 3 controls and tagmapped them, but it is simply not working.
Just to test I have mapped the TextBox control too and that works fine on the same page. It also comes into Debug. But the AudienceEditor is simply not working.
All I can think of is that you are seeing this behaviour because the tagMappings are applied at compile time, and the parent control that instantiates the AudienceEditor as a child control is already compiled into it's own dll.
Some alternative solutions that I think would do the job.
use css to display an image with your text as a background image,
positioned where you want it.
use javascript to inject the text when
the document has been loaded in the browser
use control adapters to
control rendering of the Audience Editor control (not very easy to
deploy when we're talking SharePoint)