I'm trying to create a ItemsControl that has a separator between items, for example a control to create a navigation bread crumb. I want the control to be completely generic.
My original method was to create extend ItemsControl, add a SeparatorTemplate property, and then have the class add separators to the ItemsHost of the ItemsControl. The problem with this approach is that if you add extra items to the container panel, the ItemGenerator gets confused and the items are out of order and don't get removed correctly.
So my second plan was to create a completely new control that would emulate an ItemsControl, but the problem I'm running into is that I can't find a way to instantiate an ItemsPanelTemplate. I would like to provide an ItemsPanel property just like ItemsControl, but I can't then create a panel from that template.
Can anyone think of a way to either instantiate an ItemsPanelTemplate or way to add controls to an ItemsControl's panel without breaking the ItemGenerator?
Well I haven't tried it myself but I would have thought you would override the GetContainerForItemOverride to acheive this.
You could create a new BreadCrumbItem control which is a templated ContentControl that has in its default template the typical ContentPresenter and whatever you want to use by default as separator all in a Grid or StackPanel.
The GetContainerForItemOverride generates a new instance of this BreadCrumbItem sets its ContentTemplate to the ItemTemplate property from your ItemsControl derivative (the BreadCrumb control?).
Your BreadCrumb control would also expose BreadCrumbItemStyle property that you assign to the BreadCrumbItem you create during GetContainerForItemOverride.
For completeness you may need to also implement the other *Container*Override methods in your BreadCrumb control.
Related
What's the elegant way of exposing ItemContainerGenerator from custom control?
I have ItemsSource property on my custom control and I would like to access UIElement corresponding to the bound item outside of it.
I don't have access to the ItemsControl nor ItemsContainerGenerator outside of my control. Should I expose ItemsControl or ItemContainerGenerator as a property, or maybe add a method for retrieving the UIElement?
I need to show the popup near the selected item. Maybe the popup should be a part of the control then I wouldn't have to do this?
If you want to be able to access the entire child ItemsControl, create a public read-only property that returns it.
If you only want to expose the ItemContainerGenerator, create a read-only property that returns it, e.g.:
public ChildItemContainerGenerator => childControl.ItemContainerGenerator;
If it makes no sense to expose the entire ItemContainerGenerator, create a public method that uses the ItemContainerGenerator internally to perform whatever you want to.
Which option to choose all comes down to your requirements actually.
I have this Groupbox setup in a C# WPF:
Lets say that the company ends up purchasing a new vehicle, how could that company add such vehicle to this window, without me having to add it to the designer like I have, and push out an update? If this is even possible. I feel like there is a better way of doing this.
The data the appears in these Comboboxes are names of drivers.
Create a base class for each such thing, let's say you name it Thing.
Use a ViewModel (if you don't have it yet) with an ObservableCollection<Thing>.
Then, in XAML, use an ItemsControl to define the DataTemplate for each such thing and bind to the ObservableCollection in the ViewModel. (I suggest you use WrapPanel for the ItemsPanel property of the ItemsControl).
That's it! Whenever you add a new Thing to the ObservableCollection in the ViewModel, it will automatically add it to the UI!
i'm using an ItemsControl to generate a list of controls based on my model.
When looking at the visual tree, i noticed that each of the rendered control is wrapped in a ContentPresenter. The controls that are added are a 3rd party control and are designed to display a splitter between each control if they are siblings..this allows a user to size each control. For example the following will show a splitter between each of the controls at run time.
<StackPanel>
<3rdPartyControl />
<3rdPartyControl />
<3rdPartyControl />
</StackPanel>
When using an ItemsControl, each of the 3rdPartyControl are wrapped in a ContentPresenter, and thus no splitter is shown. I have tried various ways to try and solve this problem but unable to get this to work unless i write code behind to add each control rather than rely on Xaml.
Does anyone know of a way to replace the contentpresenter completely (in my case with 3rdpartyControl)?
Thanks
In order to replace the ContentPresenter you could derive from ItemsControl and override the GetContainerForItemOverride method to create a specialized container control.
ListBox for example overrides this method to create a ListBoxItem as container for a new item object.
That's true, every element that you add to ItemsControl is wrapped with ContentPresenter, you can find more details about it in the greate series of articles from dr.wpf ItemsControl a-z
One way I would suggest to try is to change ItemsControl to ListBox and make ListBox act like ItemsControl. In this case you can re-style/re-template ListBoxItem and replace ContentPresenter with your control. You would also need to stop selection support. Here is ListBox style that you need to change.
How can I create a binding to a property defined in an UserControl from XAML which includes it? For example, I have a control of type local:Photo named thePhoto, which has three controls local:Layer called Main, Frame and Text, and I want to access thePhoto.Main.ActualWidth from my MainWindow? Thanks
(I forgot to say that simple Binding with Path and ElementName doesn't work)
Create DependencyProperty of desired type within "parent" UserControl and bind it with needed Properties on both sides.
Nice example of doing stuff like that:
Exploring the use of Dependency Properties in User Controls
I have created a data template for a data class. The width of the grid created by the datatemplate is bound to a property in the data class, ie, the size of the control matters.
I am creating a list of the data class objects, and adding them to an items control in MainWindow.
Update:
I would like to line up the controls from the data list one after another, and not have them resize.
Example:
[---------box1----------][--box2--][------box3-----]
each are the same data template type, and different widths. Perhaps I shouldn't be using itemsControl, but I am unsure of what other control to use to achieve this.
Any help would be much appreciated. I can post XAML
Can you post some XAML.
It can depend on the HorizontalContentAlignment of the ItemsControl or the style of your ItemContainer/ItemPanel.