Im a beginner in WPF programming, coming from .NET 2.0 C#.
Im trying to make a horizontal StackPanel which should be filled with data from a table in a database. The problem is that I want it to display an image with some text from the table below and then stack those two items horizontally.
Here's some pseudo-code to display what I want to do:
<StackPanel Orientation="horizontal" ItemsSource="{Binding Path=myTable}">
<StackPanel>
<Image Source="User.png"/>
<Label HorizontalAlignment="Center" Content="{Binding Path=UserName}"></Label>
</StackPanel>
</StackPanel>
I simply cannot figure oout how to do this.
Julien's answer is correct for your written description, however, looking at your XAML, it appears you are looking for something like the following:
<DataTemplate x:Key="UserDataTemplate">
<StackPanel>
<Image Source="User.png"/>
<Label HorizontalAlignment="Center" Content="{Binding Path=UserName}" />
</StackPanel>
</DataTemplate>
<ItemsControl x:Name="UserList" ItemTemplate="{StaticResource UserDataTemplate}" >
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
You definately need an ItemsControl (or some derivation of) to bind your source to. Then you can change the the orientation by setting it's items panel (which I believe is a VirtualizingStackPanel with Vertical orientation by default) so just set it to a VirtualizingStackPanel with Horizontal Orientation. Then you can set the ItemsTemplate for each of your items to the layout you desire (an image stacked on top of text bound from your database).
Basically, you want to use a control capable of displaying an enumeration of objects. The control capable of this is the class ItemsControl and all of its descendants (Selector, ListBox, ListView, etc).
Bind the ItemsSource property of this control to a list of objects you want, here a list of users you've fetched from the database. Set the ItemTemplate of the control to a DataTemplate that will be used to display each item in the list.
Sample code:
In a Resources section (for example Window.Resources):
<DataTemplate x:Key="UserDataTemplate">
<StackPanel Orientation="Horizontal">
<Image Source="User.png"/>
<Label HorizontalAlignment="Center" Content="{Binding Path=UserName}" />
</StackPanel>
</DataTemplate>
In your Window/Page/UserControl:
<ItemsControl x:Name="UserList" ItemTemplate="{StaticResource UserDataTemplate}" />
In your code behind:
UserList.ItemsSource = ... // here, an enumeration of your Users, fetched from your db
Related
I've a ObservableCollection, when I want to display this ObservableCollection with CheckBox I am simply binding the contents to CheckBox but when I want to display the same collection by using ComboBox I am unable to do that. Any suggestions?
XAML: Display collection using CheckBox --WORKS
<ItemsControl ItemsSource="{Binding Synonyms}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" Margin="0,5,0,0" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<!--Display items in CheckBox-->
<CheckBox Content="{Binding Display}" Margin="10,0,0,0" /> // Display is the collection.
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Output:
XAML: Display collection using ComboBox --NOTHING OVER HERE
<ItemsControl ItemsSource="{Binding Synonyms}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" Margin="0,5,0,0" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<!--Display items in ComboBox.-->
Approach - 1
<ComboBox>
<ComboBoxItem Content="{Binding Display}"/>
</ComboBox>
Approach - 2
<ComboBox ItemsSource="{Binding Path=Synonyms}" DisplayMemberPath="Display"/>
Approach - 3
<ComboBox >
<ComboBox.ItemTemplate>
<DataTemplate>
<Border BorderBrush="Green" BorderThickness="1" Padding="5">
<TextBlock Text="{Binding Path=Display,StringFormat='Display: {0}'}" />
</Border>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Output:
I want to display items(one,two,three, etc.) inside oneComboBox with Select All option. I've tried several approaches but nothing. What am I missing here?
The checkbox is not designed to hold multiple items unlike the Combobox so implementing a system designed for the checkbox is not relevant for the combobox.
To solve your issue, remove the combobox from the ItemsControl and have it stand on its own:
<ComboBox ItemsSource="{Binding Synonyms}" DisplayMemberPath="Display"/>
Which tells the combobox to bind its ItemsSource to the data context which is unspecified, which is fine, so it then gets it's parent's data context. That process works its way up to each parent until it finds a bound data context (most likely the page's datacontext to a VM instance).
Assuming that the data context is valid at some point in the visual tree, it will bind to that instance and look for a property named Synonyms. From the Synonyms property it will use that as a list to display items.
To show (display) text in the combobox (instead defaulting to the item's ToString()) the combobox will show the string from the item's property Display.
Giving a list of items in one drop down.
The short answer, is you should use a ComboBox as the root element, not ItemsControl. CompboBox is just a specialized version of ItemsControl.
<ComboBox ItemsSource="{Binding Synonyms}" DisplayMemberPath="Display"/>
The longer answer.
ComboBox derives from ItemsControl, so you get all the features the base class, plus additional features.
ItemsControl (and its derived classes) provides a way of repeating a set of data in the UI. The DataTemplate is where you specify what UI you want for each "row" of data in the Synonyms source.
What you are doing is asking Silverlight to create a separate ComboBox for each underlying data row.
You can still use a DataTemplate within the ComboBox. Like this.
<ComboBox ItemsSource="{Binding Synonyms}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<!--Display items in CheckBox-->
<TextBox Text="{Binding Display}"
Margin="10,0,0,0"
FontWeight="Bold" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Is there a general mechanism in WPF that allows for any or almost any control to be selected? For instance, you could have some Image controls on a WrapPanel defined in XAML, and you need to be able to select them either one by one, or by dragging over with the mouse to mark multiple.
In terms of code, I can imagine the following:
<WrapPanel>
<Image Source="{StaticResource ResourceKey=pic1}" />
<Image Source="{StaticResource ResourceKey=pic2}" />
<Image Source="{StaticResource ResourceKey=pic3}" />
<Image Source="{StaticResource ResourceKey=pic4}" />
<Image Source="{StaticResource ResourceKey=pic5}" />
</WrapPanel>
Yes, its called a ListView.
If you need the look of a WrapPanel, just set the ItemsPanel property like so:
<ListView>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
Documentation on MSDN.
You would need to make the Image objects part of the ItemTemplate in your example. You can manually define the Items collection or use a CompositeCollection as the items source as well.
For me it worked with the solution I found here: WrapPanel doesn't wrap in WPF ListView
It's basically the same solution as BradleyDotNET's, but it includes ScrollViewer.HorizontalScrollBarVisibility="Disabled" in the list view and by doing so, it makes the wrap function work without needing to do anything more.
<ListView ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
...
</ListView>
I have the following classes, which contain ObservableCollections of the next level down:
Draw
ObservableCollection<Round>();
Round
ObservableCollection<Formation>();
Formation
So a Draw is made up of Rounds, Rounds are made up of Formations.
I have a page which has a button to create a random draw, I currently have it calling another class which returns a draw:
this.defaultViewModel[DrawName] = RandomDraw.generate();
I am having no problem binding a ListView to Rounds and displaying round information, but how do I display the individual formations? This is what I am currently doing, I was not expecting to be able to just display things by binding to Formations but how do I access it?
<ListView
ItemsSource="{Binding Rounds}"
IsItemClickEnabled="True"
ItemClick="ItemView_ItemClick"
ContinuumNavigationTransitionInfo.ExitElementContainer="True">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Margin="0,0,0,9.5">
<TextBlock
Text="{Binding RoundNumber}"
TextWrapping="Wrap"
Pivot.SlideInAnimationGroup="1"
CommonNavigationTransitionInfo.IsStaggerElement="True"
Style="{ThemeResource ListViewItemTextBlockStyle}"
Margin="0,0,19,0"/>
<TextBlock
Text="{Binding Formations}"
TextWrapping="WrapWholeWords"
Pivot.SlideInAnimationGroup="2"
CommonNavigationTransitionInfo.IsStaggerElement="True"
Style="{ThemeResource ListViewItemContentTextBlockStyle}"
Margin="0,0,19,0"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
You should take a look at Hierarchical Data Templates, which are used by the WPF TreeView control rather than ListViews. They are a natural fit to show hierarchical data. Of course, like any WPF control, you can completely customize their appearance using styling and templates. Here are some good references:
MSDN How to: Use a TreeView to Display Hierarchical Data
Hierarchical Databinding in WPF
However, if you would like to keep using ListViews, then one way to do this is to nest another container control inside the parent ListVIew. ObservableCollections are processed automatically by specific WPF elements, such as Panels. In your example, you can replace the second TextBlock with another ListView, with an ItemTemplate similar to the first. It can also be any Collection-like Panel element, such as StackPanel.
<ListView
ItemsSource="{Binding Rounds}"
IsItemClickEnabled="True"
ItemClick="ItemView_ItemClick"
ContinuumNavigationTransitionInfo.ExitElementContainer="True">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Margin="0,0,0,9.5">
<TextBlock
Text="{Binding RoundNumber}"
TextWrapping="Wrap"
Pivot.SlideInAnimationGroup="1"
CommonNavigationTransitionInfo.IsStaggerElement="True"
Style="{ThemeResource ListViewItemTextBlockStyle}"
Margin="0,0,19,0"/>
<!-- CHANGED CODE HERE -->
<ListView
ItemsSource="{Binding Formations}"
...>
<ListView.ItemTemplate>...</ListView.ItemTemplate>
</ListView>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
I am trying to create a DataTamplate which should contain a StackPanel with a certain number of StackPanels.
<DataTemplate x:Key="DataTemplate">
<StackPanel Orientation="Vertical">
<StackPanel Orientation="Horizontal">
<Rectangle Fill="Aqua" Margin="2" Height="100" Width="50" VerticalAlignment="Top" HorizontalAlignment="Left"/>
</StackPanel>
</StackPanel>
</DataTemplate>
The code snippet above is just for a better understanding of my desired result, as the elements in the imbricated StackPanel will be binded.
This generates the following error message:
VisualTree of ItemsPanelTemplate must be a single element.
Any alternatives that could work?
You should ItemsControl with ItemsSource bound to your source list. In ItemsControl.ItemsPanel you can set which panel you want to use for items. In your case you should use StackPanel with Orientation=Vertical as ItemsPanel. See first sample here. But vertical StackPanel is already default ItemsPanel so you can omit it.
Inner StackPanel should be specified as ItemTemplate in your ItemsControl.
Your XAML should look like this:
<ItemsControl ItemsSource="...">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel>
<!-- properties of your object should go here -->
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
I have an ItemsControl with a DataTemplate that is bound to an ObservableCollection of integers.
<ItemsControl Name="DimsContainer" ItemTemplate="{StaticResource DimensionsTemplate}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
And in the Windows Resources:
<Window.Resources>
<DataTemplate x:Key="DimensionsTemplate" >
<TextBlock Text="{Binding}"
Padding="5"
VerticalAlignment="Center"
FontSize="32"/>
</DataTemplate>
</Window.Resources>
My problem is that in code, I need to be able to determine the width of the TextBlocks (or whatever the element is if I change it later) in the ItemsControl. Does anyone have an idea how to do this?
When I do DimsContainer.Items[i] it gives me the bound item not the TextBlock.
You should be able to use instead:
DimsContainer.ItemContainerGenerator.ContainerFromIndex(i);
This won't give you the TextBlock itself, but it will give you the generated ContentPresenter that is wrapped around it by the ItemsControl to contain the ItemTemplate.