I'm currently trying to use Telerik's RadSlideView to display my images. I've followed the code in http://www.telerik.com/help/windows-phone/radslideview-gettingstarted.html and they work perfectly well, but on the other hand I'd like to bind to real objects (with a variety of properties) and not just string arrays.
My main reason for wanting to do this is to allow the RadSlideView to show more than just images. I'd like to have descriptions, and other stuff! (which all belong to a specific object) I know this question might be kinda obscure, but if you could give me any ideas, it'd help me a long way :) cheers.
In the page you linked there's a sample with "complex" databinding, look at the ItemTemplate property where there's the image with a description :
<telerikPrimitives:RadSlideView.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock Text="{Binding Title}" FontSize="{StaticResource PhoneFontSizeExtraLarge}"/>
<Image Source="{Binding ImagePath}" Stretch="None" Grid.Row="1" Margin="0,12,0,0"/>
</Grid>
</DataTemplate>
</telerikPrimitives:RadSlideView.ItemTemplate>
Is it not what you want ?
Related
I have an editor in a grid at the bottom of a page with auto expands.
However, as it is at the bottom of the page, it expands beyond the bottom of the page.
Is there any way to make it expand upwards like WhatsApp does?
The editor is pretty standard.
<Editor AutoSize=”TextChanged” IsVisible="true" x:Name="Editor" Placeholder="Type a message..." /<
Thank you!
In your case, I think what you need to do is to play with the Grid.RowSpan property of your Editor.
For example, if the editor is located on the 3nd row (set at Grid.Row="2") and you want it to expand on top of the 2nd row, you can do something like this:
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="auto" />
<RowDefinition Height="auto" />
</Grid.RowDefinitions>
...
<Editor Grid.Row="2"
Grid.RowSpan="2"
VerticalOptions="End"
... />
</Grid>
The Grid.RowSpan allows you to expand the element to the row below.
You can see more here: https://learn.microsoft.com/en-us/dotnet/api/xamarin.forms.grid.rowspanproperty?view=xamarin-forms
I hope it helped 😉
Which control in Xamarin can be utilized to do listing through a list of objects with the arrows left and right such as the one on the screenshot?
There is no such a control in Xmarin.forms .But you can implement it by yourself.
in xaml
<Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<Grid.RowDefinitions>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.15*" />
<ColumnDefinition Width="0.7*" />
<ColumnDefinition Width="0.15*" />
</Grid.ColumnDefinitions>
<StackLayout Grid.Column="0" VerticalOptions="CenterAndExpand" HorizontalOptions="CenterAndExpand">
<Image Source="xxx" x:Name="rightBtn"/>
</StackLayout>
<controls:CarouselViewControl Grid.Column="1" Orientation="Horizontal" InterPageSpacing="10" Position="{Binding myPosition}" ItemsSource="{Binding myItemsSource}" VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<controls:CarouselViewControl.ItemTemplate>
<DataTemplate>
<local:MyView />
<!-- where MyView is a ContentView -->
</DataTemplate>
</controls:CarouselViewControl.ItemTemplate>
</controls:CarouselViewControl>
<StackLayout Grid.Column="2" VerticalOptions="CenterAndExpand" HorizontalOptions="CenterAndExpand">
<Image Source="xxx" x:Name="leftBtn"/>
</StackLayout>
</Grid>
You can use CarouselView . And change the position of it when you click right or left button .You can add a tap gesture recognizer on image or use ImageButton if you want to set button image by yourself. Or you can use default arrows of CarouselView .
If the arrows are a requirement and you don't have many items in your control (10 or less), the CarouselView is matching exactly your requirements. You can even show the arrows with the ShowArrows property.
https://github.com/alexrainman/CarouselView
Careful though cause this component doesn't recycle its views, that's why it's good only for a small number of views.
If you have a high number of views, you use this HorizontalListView with Carousel list layout:
https://github.com/roubachof/Sharpnado.Presentation.Forms#carousel-layout
What about the Xamarin.Forms CollectionView?
CollectionView has a flexible layout model, which allows data to be presented vertically or horizontally, in a list or a grid.
CollectionView supports single and multiple selection.
CollectionView has no concept of cells. Instead, a data template is used to define the appearance of each item of data in the list.
CollectionView automatically utilizes the virtualization provided by the underlying native controls.
CollectionView reduces the API surface of ListView. Many properties and events from ListView are not present in CollectionView.
CollectionView does not include built-in separators.
See documentation.
Now I'm working on updating the UI of my app(XF for Android). I found this UI solution for appbar(from source code Evolve 2016):
It looks beautiful and is implemented simply:
<ContentPage.Content>
<Grid RowSpacing="0" >
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackLayout BackgroundColor={StaticResource Primary}, Grid.Row=0/>
<SearchBar/>
</StackLayout>
<StackLayout Grid.Row=1>
//other content
</StackLayout>
.....
For existing navigation(Master-Detail) it works fine. But I click by item (on this page) - than open new page(no Master Detail). Work like this:
await Navigation.PushAsync(new SessionDetailPage(), true);
I click back on toolbar - return to Session page than I get a white line display for a short time
it does not last long, a split second. then the white line disappears. But it's unpleasant to use.
Any ideas? How can I improve this?
Might be RowDefinition Height="Auto" calculating and resizing itself, try use absolute value to check if this is the cause.
<listbox>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Height="120" Width="480" VerticalAlignment="Top">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="110"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Border
Height="105"
Width="110"
BorderBrush="White"
Grid.Column="0"
BorderThickness="2">
<Image
delay:LowProfileImageLoader.UriSource="{Binding Path=Avatar}"
Source="/Image/default-thumb-groups.png">
</Image>
</Border>
<Grid Grid.Column="1">
<Grid.RowDefinitions>
<RowDefinition Height="4"/>
<RowDefinition Height="35"/>
<RowDefinition Height="50"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="10" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock
Text="{Binding Path=Name,Mode=TwoWay}"
Grid.Column="1"
Grid.Row="1"
FontFamily="Segoe WP Light"
FontSize="26"
Foreground="{StaticResource PhoneForegroundBrush}"
TextWrapping="Wrap">
</TextBlock>
<TextBlock
Text="{Binding Path=Members,Mode=TwoWay}"
Grid.Column="2"
Grid.Row="2"
FontFamily="Segoe WP Light"
HorizontalAlignment="Left"
FontSize="20" Opacity="0.91"
Foreground="{StaticResource PhoneForegroundBrush}"
TextWrapping="Wrap">
</TextBlock>
<toolkit:ContextMenuService.ContextMenu>
<toolkit:ContextMenu
Name="DeleteGroup"
IsZoomEnabled="False"
Tag="{Binding Nid,Mode=TwoWay}"
Visibility="{Binding ElementName=GroupList, Path=DataContext.DeleteStatus,Mode=TwoWay, Converter=
{StaticResource booleanToVisibility}}" Opened="DeleteGroup_Opened" Closed="DeleteGroup_Opened">
<toolkit:MenuItem Header="delete group">
<Interactivity:Interaction.Triggers>
<Interactivity:EventTrigger EventName="Click">
<Command:EventToCommand Command="{Binding ElementName=GroupList,
Path=DataContext.DeleteCommand,Mode=TwoWay}" CommandParameter="{Binding
ElementName=DeleteGroup}" PassEventArgsToCommand="True"/>
</Interactivity:EventTrigger>
</Interactivity:Interaction.Triggers>
</toolkit:MenuItem>
</toolkit:ContextMenu>
</toolkit:ContextMenuService.ContextMenu>
</Grid>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
While trying for cleanup ; The Trigger of Context menu is not Detaching ; Because of this that page is not Dying even after navigating back from the page. This causing Saviour memory issue in our page. Please help me to resolve this Issue
Never worked with the Toolkit ContextMenu, but noticed that you are not the only one having similar problem. For example this article proves that "the ContextMenu control attaches itself to the RootVisual via mouse event handlers and therefore never gets GC'ed; even worse, the visual tree it is placed in is kept alive as well". Even if that article talks about the desktop, the symptoms are probably the same on WP7.
I would try to create/destroy menu programatically. This article demonstrates the techniques that can be used.
Another possibility would be to customize the listbox:
Override PrepareContainerForItemOverride: Call base.PrepareContainerForItemOverride() to get the standard ListBoxItem and add ContextMenu to it manually.
Override ClearContainerForItemOverride to clear the menu reference.
(Never tried that, but it should work.)
A side remark
Your Xaml seems to be overcomplicated to me. If nothing else, then using nested grids within ListBoxItem (which in turn is embedded into ListBox panel (VirtualizingStackPanel), which is in at least one more panel on the page level) must have terrible perf impact.
Even if I forget that the internal 4x2 grid uses 2 cells only (perhaps you simplified presented Xaml), what's the purpose of the outer grid? The same effect can be achieved by using a single grid and column span over the first column.
I have been trying to find both built-in datagrid control and third party datagrid control for windows phone 7 but with no luck. Can anyone please guide me?
You know you can do this with a simple listbox or (if you want images in your grid) the deferred load Listbox. Here's some simple XAML to show you how:
<ListBox x:Name="myListBox">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<HyperLinkButton Content="{Binding Path=Description}" NavigateUri="{Binding Path=UriForEditingResource}"
<TextBlock Text="{Binding Path=LongDescription}" Grid.Column="1" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
In the above example I assume that you setting the myListBox control's ItemSource to a collection of objects whose class contains 3 properties (Description, LongDescription, and UriForEditingResource). There are 2 columns in my example and these columns will be of equal size and they should take over all the available space.
Use Blend to edit these (it will be much easier for you). BTW, I inlined my datatemplate. Blend will typically create a resource for the data template (which means you can re-use datatemplates.
I hope that helps you out some (BTW, the ListBox is not the only control you can do this type of thing with, so study the available controls).
Jay