I'm trying to make my xaml squeeze list items (images) to fit the initial window size, but they cant be fixed size because i want to scale them up as i increase the size of the window. Something like a ViewBox would do.
I load images from 2 folders (software and hardware). Number and size of the images will wary in the runtime so i want to make items be the same size regardless of images size or number of items.
That's why i used uniform grid as a items panel template.
But, this is the result I'm getting...
The ListView loads images in their full size and expands itself to fit them in, cutting of some of the items in the process.
This is my xaml:
<Window x:Class="WPF_UI_Testing.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WPF_UI_Testing"
mc:Ignorable="d"
Title="MainWindow" Height="460" Width="640">
<Grid>
<ListView x:Name="listview1">
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Name}"
FontWeight="Bold" FontSize="18" />
</StackPanel>
</DataTemplate>
</GroupStyle.HeaderTemplate>
<GroupStyle.Panel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"></StackPanel>
</ItemsPanelTemplate>
</GroupStyle.Panel>
</GroupStyle>
</ListView.GroupStyle>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid ></UniformGrid>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel>
<Image Source="{Binding problemImage}"/>
<TextBlock Text="{Binding ImageName}"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
</Window>
Is there a way to prevent ListView from expanding beyond window borders when populated with content?
EDIT:
I packed the entire solution with some dummy data and images if anyone wants to have a go at this...
https://drive.google.com/file/d/1IWqxSR3kpsVdCm5Qcgn6QZbZhbYz52n2/view?usp=sharing
The UniformGrid does basically what you want. The idea to use it as item panel is also correct. The only problem that arises, aside from using item groups, is the fact that the ListView wraps its panel into a ScrollViewer, which results in items or the UniformGrid to resize differently as the ScrollViewer gives the panel no size restrictions. UniformGrid needs to be hosted in a fixed size container in order to be able to calculate its children's max sizes.
You should either use the ItemsControl
<ItemsControl>
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate DataType="{x:Type viewModels:DetailItem}">
<StackPanel>
<Image Source="{Binding problemImage}"/>
<TextBlock Text="{Binding ImageName}"/>
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
or override the ControlTemplate of ListView and remove the ScrollViewer (if you need its additional features of ListView):
<ListView>
<ListView.Template>
<ControlTemplate TargetType="ListView">
<Border BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}">
<ItemsPresenter />
</Border>
</ControlTemplate>
</ListView.Template>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemTemplate>
<DataTemplate DataType="{x:Type viewModels:DetailItem}">
<StackPanel>
<Image Source="{Binding problemImage}"/>
<TextBlock Text="{Binding ImageName}"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
The limitations of this approach is when using groups to display the items. UniformGrid should handle GroupItem (nested items) not as expected.
As said in my previous comment, if you want to group items, you need to extend a panel of your choice to manually arrange GroupItem and it's children (nested ItemsPresenter). As you think about how to calculate sizes you may realizes that it is more complicated to calculate group item sizes with dynamic grouped item sizes.
I recommend to let go the grouping and use one of the above solutions or use grouping and embrace the ScrollViewer.
Related
I have a StackPanel inside a ScrollViewer and I would like to bind items and define their datatemplate so I use a ItemsControl. The problem appears to be the ItemsControl does not implement IScrollSnapPointsInfo and this is breaking my vertical snap points associated with the StackPanel children and the ScrollViewer.
These vertical snap points should allow the items bound to the stack panel to align in the vertical center position of the scroll viewer when the user scrolls.
Bellow is some sample code:
<ScrollViewer x:Name="ScrollViewer"
ZoomMode="Disabled"
ZoomSnapPointsType="None"
VerticalSnapPointsType="Mandatory"
VerticalSnapPointsAlignment="Center">
<ScrollViewer.Content>
<Grid>
<!-- Start StackPanel -->
<StackPanel x:Name="StackPanel" Margin="0,500,0,500" Orientation="Vertical">
<StackPanel.Children>
<ItemsControl ItemsSource="{x:Bind Items, Mode=OneWay}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate x:DataType="model:ScrollItem">
<Button Margin="8,0">
<Button.Content>
<Grid>
<TextBlock Text="Hello" Foreground="Black" FontSize="20" />
</Grid>
</Button.Content>
</Button>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</StackPanel.Children>
</StackPanel>
<!-- End StackPanel -->
</Grid>
</ScrollViewer.Content>
</ScrollViewer>
Does anyone have experience with this? any advice on how I can restore the vertical snap points and still bind to the stack panel would be great.
Ideally I would like to just bind a list of items to the stack panel and define the template in xaml. This is much better than creating elements in code etc...
I am trying to make a column chart using WPF. For the Y axis I have a list of values which I would like to display on the control.
I have a ListView bound to the collection. How can I get the items to spread over the entire length of the list view rather then squish together at the top? And is the ListViewthe correct control to use for this?
Here is a sample of my Xaml:
<ListView Grid.Row="1" Grid.Column="1" Grid.RowSpan="2"
ItemsSource="{Binding YAxisValues}"
Background="Gray" VerticalContentAlignment="Stretch">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Label Content="{Binding Path=Value}"
Foreground="White"
HorizontalAlignment="Left"
FontSize="12" Width="50"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
On the left is the list view as i currently have it.
On the right is my desired result.
How can I change my ListView to get there? Or do I need to use a different control entirely?
with UniformGrid used as ItemsPanel items get equal height
<ListView Name="Axis" Grid.Row="1" Grid.Column="1" Grid.RowSpan="2"
ItemsSource="{Binding YAxisValues}"
Background="Gray" VerticalContentAlignment="Stretch"
ScrollViewer.VerticalScrollBarVisibility="Disabled">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid Columns="1"/>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemTemplate>
<!--no changes-->
</ListView.ItemTemplate>
</ListView>
there can be a issue when ListView doesn't have enough height for all elements. In that case I would put ListView into ViewBox
Set HorizontalContentAlignment to Stretch for items.
<ListView>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</ListView.ItemContainerStyle>
</ListView>
I use a ListBox to show the contents of an ObservableCollection in my view. In my simplified example, I just use an image for each item like that:
<Window>
<Window.Resources>
<DataTemplate DataType="{x:Type viewModel:HealthCriterionViewModel}">
<Image VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Source="Optionsh.png" Stretch="Fill" />
</DataTemplate>
</Window.Resources>
<ListBox ItemsSource="{Binding HealthCriteria}" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
</Window>
HealthCriteria is a collection of type HealthCriterionViewModel.
What I get is this:
What I want is this (stretch images to use all available space both vertically and horizontally):
How can I achieve this?
I suggest you can't achieve it with ItemsControl. Because contents presenter size is not fixed, it's scrollable area. So size of each element should be fixed. It can be limited directly in ItemsPanel with "Weight" or "Height" (depends on orientation) properties or limited by content size.
I have a situation where I want to see a queue of items related to another list. I want to arrange the parent items vertically and the child items horizontally. So Far I have the following:
Parent:
<ListBox x:Name="listResources" ItemsSource="{Binding Resources}" >
<ListBox.ItemTemplate>
<DataTemplate>
<local:ResourceControl x:Name="resources" thisResource="{Binding Path=.}" Margin="2"></local:ResourceControl>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
My Child items:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.Resources>
<Style TargetType="ListBox">
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<StackPanel
Orientation="Horizontal"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Margin="3">
</StackPanel>
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<StackPanel Grid.Column="0">
<TextBlock FontSize="20" x:Name="labelResourceName" Text="{Binding ResourceName}"></TextBlock>
</StackPanel>
<ListBox Grid.Column="1" x:Name="listOperations" ItemsSource="{Binding Operations}" >
<ListBox.ItemTemplate>
<DataTemplate>
<local:OperationControl x:Name="operations" thisOperation="{Binding Path=.}" Margin="2" ></local:OperationControl>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
This works relatively well and gives me my child items listed horizontally as I want them to be. The problem is that I need to be able to scroll the child items individually. As it is written currently I have the ability to scroll horizontally, but all of the child items scroll together.
I have attempted to wrap the parent listbox inside a but that did not seem to do it either.
How can I get the items inside of the listbox to scroll individually instead of all together as a group?
I found the answer to this issue. The problem was that I had not defined a width for the listboxes. Once I added widths to the controls the scrolling worked properly.
I have an ItemsControl, I've built the items that I'm displaying in it (views:DisplayGroupView) in such a way that they will expand horizontally to show all their contents and not vertically (only using the available height)
I've changed my ItemsPanel of the ItemsControl to use a StackPanel with Orientation="Horizontal"
Layout wise it's perfect, but no matter what I do I can't get it to scroll horizontally so I can see everything.
This is the XAML for the ItemsControl:
<ItemsControl ItemsSource="{Binding DisplayGroups}" Grid.Row="1" Margin="120,20,120,20" VerticalContentAlignment="Stretch">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate >
<StackPanel Orientation="Horizontal" ScrollViewer.HorizontalScrollMode="Enabled" ScrollViewer.HorizontalScrollBarVisibility="Visible"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<views:DisplayGroupView Margin="0,0,20,0" DataContext="{Binding}" VerticalAlignment="Stretch"></views:DisplayGroupView>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
This lays everything out okay, but won't scroll. I've also tried changing the ItemsControls template to include a scrollviewer, but this only stacks things vertically:
<ItemsControl.Template>
<ControlTemplate>
<ScrollViewer x:Name="ScrollViewer" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch" ScrollViewer.HorizontalScrollMode="Enabled" ScrollViewer.VerticalScrollMode="Disabled">
<ItemsPresenter VerticalAlignment="Stretch"/>
</ScrollViewer>
</ControlTemplate>
</ItemsControl.Template>
How can I get the horizontal layout while still being able to scroll?
If you pull it out of the ItemsControl and embed it by itself, for some reason that often acts as a workaround so something like;
<ScrollViewer VerticalScrollBarVisibilty="Disabled" HorizontalScrollBarVisibility="Auto">
<ItemsControl/>
</ScrollViewer>