Develop Reference

How to focus into AutoCompleteBox

How to focus into AutoCompleteBox? I've tried many of code by searching on stackover but not getting focus. here is some code which i wrote.
<controls:AutoCompleteBox Name="SearchTextBox" IsTextCompletionEnabled="True" SelectedItem="{Binding Code, Mode=TwoWay}" Grid.Column="1" PreviewKeyDown="SearchTextBox_PreviewKeyDown" >
<controls:AutoCompleteBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Code}"/>
<TextBlock Text="{Binding Name}"/>
</StackPanel>
</DataTemplate>
</controls:AutoCompleteBox.ItemTemplate>
</controls:AutoCompleteBox>
and for focus i've creating a class named FocusableAutoCompleteBox
public class FocusableAutoCompleteBox : AutoCompleteBox
{
public new void Focus()
{
var textbox = Template.FindName("SearchTextBox", this) as AutoCompleteBox;
if (textbox != null) textbox.Focus();
}
}
and focus by
new FocusableAutoCompleteBox().Focus();
but errors appears
Object Reference not set to an instance of object
I also tried SearchTextBox.Focus(); but not getting result.

this works for me.
Keyboard.Focus(SearchTextBox);
SearchTextBox.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));

Pass update parameter in WPF using MVVM

I am having a problem updating Entity while using WPF MVVM and commands.
My WPF looks like:
<Popup Margin="10,10,0,13" Name="UpdatePopup" HorizontalAlignment="Left" VerticalAlignment="Top" Width="450" Height="100" IsOpen="{Binding IsOpen, Mode=TwoWay}">
<Border Padding="5" Background="WhiteSmoke">
<StackPanel Orientation="Horizontal" DataContext="{Binding CommendationEntity}" Width="450" Height="100">
<Label Content="Nazwa żódła" Margin="10,10,10,10" Width="75" Height="30"/>
<TextBox Text="{Binding Name}" Margin="10,10,10,10" Width="130" Height="30" x:Name="Name" />
<Button Command="{Binding DataContext.UpdateCommand, ElementName=UpdatePopup}" CommandParameter="{Binding id}" Content="Update" Margin="10,10,10,10" Width="80" Height="30"/>
<Button Command="{Binding DataContext.CancelCommand, ElementName=UpdatePopup}" Content="Anuluj" Margin="10,10,10,10" Width="80" Height="30"/>
</StackPanel>
</Border>
</Popup>
Now to update record I need id and new name so I am passing id with button binding, and I am having trouble passing name, my update method looks like:
public void UpdateEntity(object obj)
{
this.CommendationEntity = this._catalog.Commendations.Single(entity => entity.id == (int)obj);
this.CommendationEntity.Name = this.Name;
this._catalog.Commendations.Attach(this.CommendationEntity);
this._catalog.Entry(this.CommendationEntity).State = System.Data.Entity.EntityState.Modified;
this._catalog.SaveChanges();
}
And in the view model I have a property named:
public string Name
{
get { return _name; }
set
{
if (_name == value)
{
return;
}
this._name = value;
RaisePropertyChanged("Name");
}
}
But when I click Update id is passed as (object obj), with is right, but Name property does not update, what could be wrong?
Maybe its data context (DataContext="{Binding CommendationEntity}") as model name and view model property has same name? I'm new WPF so I can be wrong.
Or maybe there is a way to just click button and whole object will be passed as (object obj)?

this.Name indicates that the Name property belongs to the same class as the UpdateCommand property and then the path of the binding to the Name property should be set up the same way:
<TextBox Text="{Binding DataContext.Name, ElementName=UpdatePopup}" Margin="10,10,10,10" Width="130" Height="30" x:Name="Name" />
Otherwise you are binding to some other Name property or the binding simply fails.

Two possibilities:
Is the binding for Name correct? For the commands you are using DataContext.UpdateCommand, ElementName=UpdatePopup so it may be you need to do this as well. If the binding fails you don't get an exception but you should get a message in the output window of VS - worth checking there.
If for some reason in the Name setter: if (_name == value) (perhaps both are emptry strings?) is true then the name won't update.

As per you code you are trying to bind Name property of CommendationEntity with textbox control.It is not getting updated because you have not implemented NotifyPropertyChanged for this.CommendationEntity.Name property. You need to implement INotifyProperty at CommendationEntity to reflect the property changed of CommendationEntity class.

How can I have a ControlTemplate that only creates a container for the default, unaltered visual tree of a control?

I'm trying to figure out how to change a control's template to something that will make it held inside a Grid, like this:
<ControlTemplate x:Key="containedTemplate">
<Grid>
<!-- place templated control here -->
</Grid>
</ControlTemplate>
I of course want any of the inner control's properties to be synced automatically with the templated control.
Can this be done at all?
Here's an hypothetical example for a TextBox template:
<ControlTemplate x:Key="textTemplate" TargetType="{x:Type TextBox}">
<Grid Background="Red">
<TextBox Name="InnerTextBox" Margin="5,5,5,5"/>
</Grid>
</ControlTemplate>
Now if I did apply the template on a TextBox instance like this:
<TextBox Text="{Binding MyTextProperty}" Template="{StaticResource textTemplate}"/>
... then the control would magically be a Grid, containing a TextBox with a few margins and whose Text's property would be bound to MyTextProperty of whatever DataContext instance has been set:
<!-- runtime visual tree I'd like to be produced by the above XAML -->
<Grid Background="Red">
<TextBox Text="{Binding MyTextProperty}" Margin="5,5,5,5"/>
</Grid>
If I had the following code:
<StackPanel>
<TextBox Text="{Binding MyTextProperty}" Template="{StaticResource textTemplate}"/>
<TextBox Text="{Binding MyOtherTextProperty}" Template="{StaticResource textTemplate}"/>
<TextBox Text="{Binding YetAnotherTextProperty}" Template="{StaticResource textTemplate}"/>
</StackPanel>
The resulting tree would be this:
<!-- runtime visual tree I'd like to be produced by the above XAML -->
<StackPanel>
<Grid Background="Red">
<TextBox Text="{Binding MyTextProperty}" Margin="5,5,5,5"/>
</Grid>
<Grid Background="Red">
<TextBox Text="{Binding MyOtherTextProperty}" Margin="5,5,5,5"/>
</Grid>
<Grid Background="Red">
<TextBox Text="{Binding YetAnotherTextProperty}" Margin="5,5,5,5"/>
</Grid>
</StackPanel>
In these examples you can see that the TextBox's Text property is correctly propagated down to the "inner" TextBox instance. The control's default visual tree is also preserved (borders, typing area, etc.).
I'm aware of template parts but as I said I'm trying to find a global approach here, and I DO NOT want to change the control's appearance; only put it inside a container.

frankly, this question exhausted me, i have this only answer but not convince me a lot.
first you should create multi ControlTemplates for each control that you want to set your template then create this class
public class ControlTemplateConverter
{
public static readonly DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached("IsEnabled", typeof(bool), typeof(ControlTemplateConverter), new UIPropertyMetadata(false, IsEnabledChanged));
private static void IsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ControlTemplate t;
if (d == null) return;
if (d is TextBlock)
t = App.Current.FindResource("TextBoxTemplate") as ControlTemplate;
else if (d is CheckBox)
t = App.Current.FindResource("CheckBoxTemplate") as ControlTemplate;
// and So On
(d as Control).Template = t;
}
public static bool GetIsEnabled(DependencyObject obj)
{
return (bool)obj.GetValue(IsEnabledProperty);
}
public static void SetIsEnabled(DependencyObject obj, bool value)
{
obj.SetValue(IsEnabledProperty, value);
}
}
and your control should like this:
<TextBox local:ControlTemplateConverter.IsEnabled="True"></TextBox>
<CheckBox local:ControlTemplateConverter.IsEnabled="True"></CheckBox>

How to bind multiple eventhandlers on WindowsPhone 8 using XAML?

I'm about to make a control page that has several textblock.
each textblock will be "linked" to another page,
here's my xaml part
.........<phone:LongListSelector x:Name="settingSelector" ItemsSource="{Binding}">
<phone:LongListSelector.ItemTemplate>
<DataTemplate>
<StackPanel toolkit:TiltEffect.IsTiltEnabled="True" Tap="{Binding TapMethod, Mode=TwoWay}" >
<TextBlock Text="{Binding SetTitle}" FontSize="43" />
<TextBlock Text="{Binding SetDescription}" FontSize="19" Margin="0 0 0 10" />
</StackPanel>
</DataTemplate>
</phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>..........
when I try this code behind :
.........public class SettingProperty
{
public string SetTitle{get; set;}
public string SetDescription{get; set;}
public string TapMethod{get; set;}
public SettingProperty(string setTitle, string setDescription, string tapMethod)
{
SetTitle = setTitle;
SetDescription = setDescription;
TapMethod = tapMethod;
}
}
List<SettingProperty> DataSetting()
{
List<SettingProperty> settingCollection = new List<SettingProperty>();
settingCollection.Add(new SettingProperty("Saldo", "cek saldo", "saldo_Tap"));
return settingCollection;
}
private void saldo_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
NavigationService.Navigate(new Uri("/saldo.xaml", UriKind.Relative));
}..........
I directly deployed them to my L520, I'm prety sure the culprit is the "Tap" binding on my stackpanel, when I omit it, the code works.
Did I miss something, or my whole method is just wrong?

our understanding of the "Tap" event is wrong.
You have two options here:
Either you clearly specify a METHOD NAME (not a string) as a event handler for the Tap event. For example:
Tap="MyControl_Tap"
In this case you must have a MyControl_Tap method in your control's code behind
OR, since you seem to be using the MVVM pattern, you have to create a ICommand, and then include your whole StackPanel in a Button, like this:
...<DataTemplate>
<Button Command="{Binding MyCommandProperty}">
<StackPanel toolkit:TiltEffect.IsTiltEnabled="True" >
<TextBlock Text="{Binding SetTitle}" FontSize="43" />
<TextBlock Text="{Binding SetDescription}" FontSize="19" Margin="0 0 0 10" />
</StackPanel>
</Button>
...

how to change the image style received from webservice in windows phone 7

I am sharing the screen shot of my application. The image which is coming i want it to be in the side and should be small in size. Here i am not getting the full image also. Can anyone help me to fit the image in the listbox and appear it in the side.
My xaml code is:
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ListBox Name="listBox1">
<ListBox.ItemTemplate>
<DataTemplate>
<Button>
<Button.Content>
<ScrollViewer HorizontalScrollBarVisibility="Auto" Height="80" Width="400">
<!--<ScrollViewer Height="80">-->
<StackPanel Orientation="Horizontal" Margin="0,0,0,0">
<StackPanel Orientation="Vertical" Height="80">
<TextBlock Text="{Binding Path=News_Title}" TextWrapping="Wrap" ></TextBlock>
<TextBlock Text="{Binding Path=News_Description}" TextWrapping="Wrap"></TextBlock>
<TextBlock Text="{Binding Path=Date_Start}" TextWrapping="Wrap"></TextBlock>
<Image Source="{Binding ImageBind }" />
</StackPanel>
</StackPanel>
</ScrollViewer>
</Button.Content>
</Button>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
My .cs code is:
public class Newss
{
public string News_Title { get; set; }
public string News_Description { get; set; }
public string Date_Start { get; set; }
public string image_path { get; set; }
public BitmapImage ImageBind{get;set;}
}
public News()
{
InitializeComponent();
KejriwalService.aapSoapClient client = new KejriwalService.aapSoapClient();
client.getarvindNewsCompleted += new EventHandler<KejriwalService.getarvindNewsCompletedEventArgs>(client_getarvindNewsCompleted);
client.getarvindNewsAsync();
}
void client_getarvindNewsCompleted(object sender, KejriwalService.getarvindNewsCompletedEventArgs e)
{
string result = e.Result.ToString();
List<Newss> listData = new List<Newss>();
XDocument doc = XDocument.Parse(result);
foreach (var location in doc.Descendants("UserDetails"))
{
Newss data = new Newss();
data.News_Title = location.Element("News_Title").Value;
//data.News_Description = location.Element("News_Description").Value;
data.Date_Start = location.Element("Date_Start").Value;
data.image_path = location.Element("image_path").Value;
data.ImageBind = new BitmapImage(new Uri( #"http://political-leader.vzons.com/ArvindKejriwal/images/uploaded/"+data.image_path, UriKind.Absolute));
listData.Add(data);
}
listBox1.ItemsSource = listData;
}

Try to move your Image outside inner StackPanel :
.....
<StackPanel Orientation="Horizontal" Margin="0,0,0,0">
<StackPanel Orientation="Vertical" Height="80">
<TextBlock Text="{Binding Path=News_Title}" TextWrapping="Wrap" ></TextBlock>
<TextBlock Text="{Binding Path=News_Description}" TextWrapping="Wrap"></TextBlock>
<TextBlock Text="{Binding Path=Date_Start}" TextWrapping="Wrap"></TextBlock>
</StackPanel>
<Image Source="{Binding ImageBind }" />
</StackPanel>
.....
That will make the Image appear besides the Text. Then try to set Width and Height properties of Image control to fixed value, and set Stretch property appropriately. See this post for reference about setting Stretch property.

There're too many wrong things here, and I don't know what you want.
You've put buttons inside items of ListBox. You should either remove buttons and rely on listbox own items selection mechanism for handling touch elents, or continue using buttons but replace ListBox with ItemsControl that doesn’t handle touch.
You’ve put ScrollViewer inside those buttons. So if you have 10 items, you’ll have 10 buttons, each with its own scroll viewer. Why you did that?
You’ve set height of your StackPanel to 80. When specifying fixed height, Silverlight often does not care whether the content fits or no, instead it clips things. It’s rarely a good idea to specify absolute size of elements.
Instead of using two nested stack panels, you should use single Grid with two rows and two columns, where image occupies both rows of the second column (using Grid.RowSpan property).
And you’re asking question about changing image style? You should fix the rest of your XAML first…