i have a long list selector that contains a check box in each list box item.
the long list selector is binded to a list that contain the name the image and the status
I want to check or uncheck the check box depending on the status of the field.
I have done a lot of search and I am not able to achieve this please help.
XAML :
<phone:LongListSelector x:Name="lstBoxRates" Margin="0,27,-12,0" ItemsSource="{Binding Items}" Height="16776941" SelectionChanged="MainLongListSelector_SelectionChanged">
<phone:LongListSelector.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="0,0,0,17">
<Image Width="54" Height="54">
<Image.Source>
<BitmapImage UriSource="{Binding LocalPath}" />
</Image.Source>
</Image>
<TextBlock Text="{Binding name}" TextWrapping="NoWrap" Style="{StaticResource PhoneTextSubtleStyle}"/>
<CheckBox x:Name="LBCheckBox" Content="{Binding LineOne}" IsChecked="{Binding IsChecked}" Height="75" Width="412" Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked" />
</StackPanel>
</DataTemplate>
</phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>
C#:
cView = new CViewModel(AppResources.DBConnectionString);
List<UBCars> ubc = cView.GetAllCars();
lstBoxRates.ItemsSource = ubc;
I tried your code and it works after making these changes:
Removed the ItemsSource binding in xaml. No point in setting it twice
Use properties, not fields, in your model (the UBCars class).
Related
I'm trying to do some XAML binding for the Windows Phone (targeting WP7.1) and I have a collection of checkboxes that I want to display. I want to put them inside the WrapPanel
What control(s) would I use to bind to a collection of checkboxes? I don't see an ItemSource for the WrapPanel. So I'm not sure what I would use.
<ListBox Height="auto" Name="lbAssignments" BorderThickness="1" BorderBrush="Black" ItemsSource="{Binding DataList}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical">
<TextBlock x:Name="TextBlock" Text="{Binding Title}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10,0,0,10" FontSize="26.667" TextWrapping="Wrap"/>
<TextBlock x:Name="TextBlock1" Text="{Binding Title}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10,0,0,10" FontSize="26.667" TextWrapping="Wrap"/>
<toolkit:WrapPanel Height="400" Width="400">
<!--collection of checkboxes-->
</toolkit:WrapPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Binding to a collection of UI controls is not exactly the thing you'd want to do. Instead, I would recommend binding to a collection. For many reasons - performance, memory allocation and general maintenance/flexibility.
Since you mentioned that you have a List<string>, you can just bind it to a ListBox:
<ListBox ItemsSource="{Binding YourList}">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding}"></CheckBox>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
However, you can still proceed with biding an element to a collection of other elements, given that appropriate support exists. You could use an ItemsControl:
<ItemsControl ItemsSource="{Binding ElementName=myPage, Path=SomeCollection}">
</ItemsControl>
Here, SomeCollection might as well be ObservableCollection<CheckBox>.
I have a list in which there are schedule name, date and time that are visible, but i want that on the long press of a particular item in a listbox there opens a context menu in which only description and schedule name of particular item is visible.
So my code in xaml is: first in the grid there is a listbox in which i have bound the whole list that is scheduleList ansd in the listbox.itemtemplate and inside the data templatei have binded the particular item to the textblock
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ListBox x:Name="scheduleListbox" ItemsSource="{Binding scheduleList}" Hold="scheduleListbox_Hold" Tap="scheduleListbox_Tap" >
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical" Height="150" Width="460">
<TextBlock x:Name="textBlock1" Text="{Binding ScheduleName}" Foreground="WhiteSmoke" FontSize="32"/>
<TextBlock x:Name="textBlock2" Text="{Binding ScheduleDate}" Foreground="Red" Margin="0,10,0,0"/>
<StackPanel Orientation="Horizontal" Height="70" Width="460" Hold="StackPanel_Hold">
<TextBlock x:Name="textBlock3" Text="{Binding StartTime}" Margin="0,5,0,0"/>
<TextBlock x:Name="textBlock4" Text="{Binding EndTime}" Margin="50,5,0,0"/>
<toolkit:ContextMenuService.ContextMenu>
<toolkit:ContextMenu x:Name="menuItem" VerticalOffset="100.0" IsZoomEnabled="True" >
<toolkit:MenuItem Header="Add to calender" ItemsSource="{Binding ScheduleName }"/>
<!--<toolkit:MenuItem Header="Description" ItemsSource="{Binding Description}"/>-->
</toolkit:ContextMenu>
</toolkit:ContextMenuService.ContextMenu>
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
Please tell me that how to bind description and schedule name in context menu, either by code or by xaml.
How to bind data in context menu either through code or through xaml?
I create a breadcrumb context menu with binding using the code below. The code you should be interested in is the toolkit:ContextMenu.ItemTemplate section where you specify the bindings. Notice that you can also bind to a command parameter like I do with the index value.
The toolkit:ContextMenu.Template section is not needed. I added this to allow scrolling the items if there are more than will fit on the screen and also to move the menu to the bottom of the screen.
<toolkit:ContextMenuService.ContextMenu>
<toolkit:ContextMenu x:Name="breadCrumbContextMenu" ItemsSource="{Binding CloudViewModel.BreadCrumbMenuItems}" Opened="ContextMenu_Opened" Closed="Breadcrumb_ContextMenu_Closed">
<toolkit:ContextMenu.Template>
<ControlTemplate TargetType="toolkit:ContextMenu">
<Border Margin="0,700,0,0" BorderThickness="1" >
<ScrollViewer MaxHeight="700">
<ItemsPresenter/>
</ScrollViewer>
</Border>
</ControlTemplate>
</toolkit:ContextMenu.Template>
<toolkit:ContextMenu.ItemTemplate>
<DataTemplate>
<toolkit:MenuItem Click="breadcrumbMenuItem_Click" CommandParameter="{Binding Index}" Padding="0">
<toolkit:MenuItem.Header>
<StackPanel Orientation="Horizontal" Height="40">
<Image Source="{Binding Image}" Width="40" Height="40" />
<TextBlock Text="{Binding Text}" Margin="24,0,0,0" />
</StackPanel>
</toolkit:MenuItem.Header>
</toolkit:MenuItem>
</DataTemplate>
</toolkit:ContextMenu.ItemTemplate>
</toolkit:ContextMenu>
</toolkit:ContextMenuService.ContextMenu>
I am using the WP7test framework from Expensify
But i have an issue with my listbox.
<controls:PanoramaItem Header="{Binding Labels.MainMenu_Main}">
<ListBox ItemsSource="{Binding MenuItems}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<cmd:EventToCommand Command="{Binding MenuItemSelectedCommand}" PassEventArgsToCommand="True" />
</i:EventTrigger>
</i:Interaction.Triggers>
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</controls:PanoramaItem>
When i try using the Then I press the control "someName"
Failed to set focus to control 'someName'
Do anybody know how i can select/press the control?
If you want to find items individual then you can put an auto: Tag value on each individual list item.
e.g.: You could use a list item template like
<TextBlock Tag="{Binding AutomationTag}" Text="{Title}" />
where AutomationTag resolves to a unique string for each list item like: auto:1, auto:2, etc.
If you want to refer to a control by name, you need to give it a name. e.g.:
<controls:PanoramaItem Header="{Binding Labels.MainMenu_Main}">
<ListBox ItemsSource="{Binding MenuItems}" Name="someName" />
</controls:PanoramaItem>
The ListBox can now be referred to by name.
i created an app to track tweets and binding it to listBox.
and, here is the xaml of the listBox:
<ListBox Margin="0,0,-12,0" x:Name="listBox1" ItemsSource="{Binding Items}" SelectionChanged="listBox1_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="0,0,0,17">
<!--Replace rectangle with image-->
<Image Height="100" Width="100" Source="{Binding DeveloperImage}" Margin="12,0,9,0"/>
<StackPanel Width="311">
<TextBlock Text="{Binding DeveloperName}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
<TextBlock Text="{Binding DeveloperBirthday}" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
but, when it was debugged, it returned into this sequence:
long blank
content
blank
what i want is:
content only, no blanks befor the content and no blanks after the content.
The way a ListBox arranges its Children is determined by its ItemsPanel.
You can replace the default ItemsPanel by setting the ItemsPanelTemplate.
Each Child is then wrapped in an ItemContainer.
You can replace the default ItemContainer by setting the ItemContainerStyle.
Finally, the ListBox itself has a border, padding and margin that influence where the ItemsPanel is placed.
So if you want to adjust the placement of the content of the listbox you will first have to find out what template(s) should be modified. A quick way is to use Blend because it will give you visual feedback.
I noticed a very strange behavior:
in my windows phone 7 I have a ListBox that can contain anything from 1-2 to 2-300 items.
I noticed that when the number of items is big (not sure about the number but for sure >150 items) the OnSelectionChanged event is not raised.
This is the XAML of my listbox
<ListBox ItemsSource="{Binding Path=Posts}" ItemTemplate="{StaticResource IconsWithText}"
ScrollViewer.VerticalScrollBarVisibility ="Disabled"
SelectionChanged="ListBox_SelectionChanged" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
And the template for the ItemTemplate is:
<DataTemplate x:Name="IconsWithText">
<Grid x:Name="ThumLink" Width="160" Height="140" Margin="10" Background="#FF666666">
<Image Source="Resources/Images/All.png" Visibility="{Binding Path=VisibilityAll}" />
<Image delay:LowProfileImageLoader.UriSource="{Binding Picture}"
Visibility="{Binding Path=VisibilityPic}"
Stretch="UniformToFill" VerticalAlignment="Top" HorizontalAlignment="Left" />
<Border x:Name="border" VerticalAlignment="Bottom" Background="#d9ffffff" Height="62" BorderBrush="Black" Visibility="{Binding Path=VisibilityPic}" >
<TextBlock x:Name="textBlock" Text="{Binding Title}" VerticalAlignment="Top" TextWrapping="Wrap" MaxHeight="60" Style="{StaticResource PhoneTextSmallStyle}"
Foreground="Black" FontSize="20" Margin="4,1,4,0" Height="62"/>
</Border>
</Grid>
</DataTemplate>
Is this a bug or did I do something wrong? I was in debug and the event handler never gets called, but it works when the items are not many.
Simone
The problem with using the plain StackPanel is that all visual object will be created and added to the StackPanel which will be very expensive in terms of memory and may trip over other limits in the rendering system.
Try changing to:-
<VirtualisingStackPanel Orientation="Horizontal" />
So far though I've not been able to reproduce your problem with 300 items even using a plain StackPanel.