I have a layout where there are two listboxes, I was trying to make them sync and found some tutorials on the net like http://www.software-architects.com/TechnicalArticles/ScrollSync/tabid/101/Default.aspx or Listboxes, scrolling in sync but they dont seem to work under WP7 SDK because there are missing events or properties. Does anybody out there solved the problem of syncing two or more listboxes under windows phone 7?
Thanks in advance
See my answer in this question: WP7 ScrollViewer programatically scroll a background ScrollViewer in sync with front ScrollViewer
You will be able to keep the scrollviewers in sync, but it may not be smooth, as the WP7 scroll viewer does not have a Scroll event.
To get the ScrollViewer's generated by the ListBox's, use this solution by ColinE WP7 - Scrolling ListBox in external ScrollViewer.
I came up with a solution using the WarpPanel available from the Silverlight Toolkit for Wp7
<ListBox Height="350" HorizontalAlignment="Left" Margin="102,72,0,0" Name="lsScore" VerticalAlignment="Top" Width="450" HorizontalContentAlignment="Center">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<toolkit:WrapPanel ItemWidth="220" ItemHeight="50"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
This solution uses one listbox which is ofc always on sync and in order to seperate the data and align them I use the ItemWidth thats why it has such a high value. If you know any other way to seperate the data without using the ItemWidth property feel free to add an answer. Thanks in advance.
Related
I have a GridView that I use to display thousands of images/thumbnails (using data binding). I used ImplicitAnimations to add transitions, so that when the control is resized and the number of columns changes - every item smoothly goes into the new position after the resize.
Problem
This all works fine when the user is at the top of the GridView but becomes a problem the further the user scrolls. The further you scroll, the more items are moved around when the number of columns changes. More rows are added/removed, but the Scrollbar is kept on the same position/offset which causes previously visible items to go far away from the view - and the user gets lost.
What I tried so far...
I tried working around this issue by tracking the first visible item on every scroll change event and then scrolling to it on SizeChanged event. The problem of this solution, however, is that it's really rough. Animations are no longer noticable and the whole experience is laggy.
Is there any better solution to this problem?
Illustration of the problem
Video example
I have also made a video to better illustrate the issue.
(The images have been blurred because some were NSFW)
Video Link
What I am looking for is a way for the scrollbar to adjust it's position on resize and stay on the same items the User was looking at - without messing up the animations.
Edit
So apparently this can't be solved any other way but manually scrolling to the item I wish to have visible on resize, which I already tried doing and had problems with the animations being really rough again because the ScrollToItem was happening AFTER the animations were being triggered.
So my question now is - can I scroll to an item on reorder/resize - BEFORE the animations get triggered? That way I think I could keep the smoothness. Using the resize event, however, doesn't work for this.
Edit 2 - Code sample
<GridView x:Name="mylist" animations:ReorderGridAnimation.Duration="600" ItemsSource="{Binding Source={StaticResource viewSource}}">
<GridView.ItemsPanel>
<ItemsPanelTemplate>
<ItemsWrapGrid Orientation="Horizontal" HorizontalAlignment="Center" Loaded="ItemsWrapGrid_Loaded"/>
</ItemsPanelTemplate>
</GridView.ItemsPanel>
<GridView.ItemTemplate>
<DataTemplate>
<Grid Width="300" Height="300" Background="Gainsboro">
<Image Source="{Binding ThumbnailImage}" />
</Grid>
</DataTemplate>
</GridView.ItemTemplate>
</GridView>
GridView ItemSource is binded to the following CollectionView
<UserControl.Resources>
<controls:AdvancedCollectionView x:Key="viewSource" Source="{x:Bind Collection}" />
</UserControl.Resources>
I switched to the Community Toolkit for the animations and the AdvancedCollectionView. The custom panel is being used for 2 reasons - to get the Panel and apply implicit animations to it - and to keep the scrollbar on the rightmost side when HorizontalAlignment is Center.
The CollectionView is binded to an ObservableCollection.
To reproduce the issue - just add a lot of items into the ItemSource and try resizing the GridView at different scroll offsets (check video sample)
.
For your this issue, it may be caused by the ListView and GridView UI virtualization, you can try to use VariableSizedWrapGrid as the GridView's ItemsPanel,
<GridView>
<GridView.ItemsPanel>
<ItemsPanelTemplate>
<VariableSizedWrapGrid/>
</ItemsPanelTemplate>
</GridView.ItemsPanel>
</GridView>
But it will cost much device memory and performance without virtualization. So you should also take into consideration displaying many images in once.
As for displaying the Item that the User is looking at, since there are many items displayed in the screen, the GridView does not know to track witch one.So also as #Pratyay's suggestion, you need to keep track of the item then make the ScrollView witch is in the GridView to scroll to the item.
I have a ListView with about 700 entries (one Image per entry). The ListView works just fine in vertical scroll mode. But when I change it to Horizontal it crashes on the phone with an OutOfMemory Exception.
I change the scroll direction with code from Microsoft:
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
It seems like Lord Windows is trying to load the complete list at once when the Orienation is changed. Anyone else experience this issue, maybe even provide a solution?
By using StackPanel you loose virtualization. So all the 700 entries are in memory at once when you scroll the list. Use VirtualizingStackPanel or better, use GridView instead of ListView.
I'm trying to create grid with listbox with Scrollbar.
It's done somehow like that:
<Grid>
<ListBox Name="xxx" ItemsSource="{Binding}" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Visible">
....
</ListBox>
</Grid>
The problem is that if I use scrollbar, then the size of bar-button jumps back and forward within scrolling. If I remove ScrollViewer from properties and instead put ListBox in ScrollViewer tag, then everything is working perfect, except of terrible performance of rerendering UI (resize, move window, resource consuming). According to google it does "disable virtualization". This sounds crazy that there's no simple solution to get properly working scrollbar and usable UI without issues.
Is there compromise for both of these things? Virtualization + properly working scrollviewer with fixed size of scrollbar button.
I want to make calendar in windows phone 8 using XAML/c#. It should like horizontal bar that has 7 days fit to screen. User can scroll these dates like on phone screen there are 1 to 7 dates and user can scroll to view more dates. If user tap on any date then its color should be changed. I was trying to implement longlistselector and listbox but could do successfully. I am newbie. please help.
Thanks
ongListSelector doesn't allows you to change scroll orientation. In other controls like the ListBox you can specify the property ItemsPanel to use a StackPanel with horizontal orientation. But that property is not available in LongListSelector (i don't know exactly the reason, but i think it might be something related with the complex grouping, jump list capabilities of the LongListSelector.
If you need to make an horizontal list and you don't need to group your data, you can replace the LongListSelector with a ListBox and use the ItemsPanel property to specify a horizontal stackpanel.
So, no issues.
You can of course use the ListBox instead of LongListSelector.
You can have it horizontally scrollable as follows:
<ListBox ScrollViewer.HorizontalScrollBarVisibility="Auto">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<Your control... />
</DataTemplate>
</ListBox.ItemTemplate>
I'm really new to programming but decided I will start learning c# development for windows phone 8. I know they have a button control in the toolbox but I am looking to make the kind of buttons you see on the start screen for the phone. No idea how.
Also I would love to know how to use the panorama control and how to incorporate the buttons asks previously to have an image and put into a verticals scroll layout, separated by panorama items of course. Please note as I said before I'm super new and don't know much yet.
To make start screen buttons alike (a.k.a tiles) take a look here. Download the examples and look under HubTile.
Now for the second part of your question all you need is a panorama page with a WrapPanelthat can also be found in the toolkit mentioned earlier.
So what you should be doing is adding a WrapPanel inside the PanoramaItem, and then the HubTiles inside the wrap panel. Here is an example:
<controls:PanoramaItem Header="hubtiles">
<Grid>
<toolkit:WrapPanel Orientation="Horizontal">
<toolkit:HubTile/> <!-- Change accordingly -->
</toolkit:WrapPanel>
</Grid>
</controls:PanoramaItem>