Itemscontrol

Itemscontrol

Control Templates In WPF

An ItemsControl object can serve two roles. It can be used to present a fixed set of items, or it can be used to display a list obtained from data binding to a data source. Using an ItemsControl for data is more common. To display data, specify the binding to the data as the ItemsSource value or use the data context and don't populate Items.

If you want to display a fixed list, populate Items with one or more FrameworkElement child objects, and don't specify ItemsSource. There are several controls that inherit from ItemsControl that you can use in your app, but you can also use an ItemsControl directly, because it does offer a basic presentation of data or items.

ListView and GridView are the two most commonly used controls for displaying data. For more info on how to use these controls, including sample code, see Adding ListView and GridView controls. ItemsSource typically references a list of items. This can be a fixed list from a business object, or a list that's designed to fire notifications if the underlying data changes. The list might be a generic interface for example IList or a practical class that implements the collection interfaces that Windows Runtime data binding supports.

When you display items in an ItemsControl, you can use the ItemTemplate property, the ItemsPanel property, or both to specify the appearance of the items. The DisplayMemberPath property can be used for a master-details view of the data. For more info on how to use these properties in data binding scenarios, how lists are supported, and how to implement two-way bindings or notifications on changes, see the "Binding to collections" section of Data binding in depth.

You can provide a custom template for an ItemsControl because it is a Control class. But before retemplating ItemsControl you should check whether one of the derived classes already offers a similar template and gives you the presentation experience you want.

In particular, if you're looking for data presentation that has an association with the orientation of the items list is either horizontal or vertical you should look at ListView and GridView. ItemsControl implements IItemContainerMappingwhich is mainly a helper interface that supports other features. App code seldom calls the IItemContainerMapping methods directly, and controls that derive from ItemsControl or any of the deeper classes typically don't have to reimplement IItemContainerMapping.

Most of the practical items controls derive from Selector in some way, either through ListViewBase or directly from Selector. Initializes a new instance of the ItemsControl class. Gets or sets a source element that provides the access key scope for this element, even if it's not in the visual tree of the source element. Gets the rendered height of a FrameworkElement. See Remarks. Gets the position of this UIElement, relative to its parent, computed during the arrange pass of the layout process.An ItemsPanelTemplate that defines the panel to use for the layout of the items.

To create a horizontal ListBoxyou can create a template that specifies a horizontal StackPanel and set it as the ItemsPanel property. The following example uses a ControlTemplate to create a horizontal ListBox that has rounded corners. In this example, instead of setting the ItemsPanel property as in previous example, the horizontal StackPanel is specified within the ControlTemplate. The IsItemsHost property is set to true on the StackPanelindicating that the generated items should go in the panel.

When you specify it this way, the ItemsPanel cannot be replaced by the user of the control without using a ControlTemplate. Therefore, only do this if you know you would not want the panel to be replaced without the use of a template.

Alternatively, you can do the following to achieve the same results. In this case, the ItemsPresenter creates the panel for the layout of the items based on what is specified by the ItemsPanelTemplate.

For MenuItemthe default uses WrapPanel. For StatusBarthe default uses DockPanel. To affect the layout of the items in an ItemsControlyou use this property to specify a ItemsPanelTemplate. The ItemsControl provides great flexibility for visual customization and provides many styling and templating properties.

You use the ItemContainerStyle property or the ItemContainerStyleSelector property to set a style to affect the appearance of the elements that contain the data items. If you are using grouping on your control, you can use the GroupStyle or GroupStyleSelector property. To specify the visualization of the data objects, use the ItemTemplate or the ItemTemplateSelector property. For more information, see Data Templating Overview.

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Skip to main content. Exit focus mode. Items Control. Controls Assembly: PresentationFramework. Gets or sets the template that defines the panel that controls the layout of items. Is this page helpful? Yes No. Any additional feedback? Skip Submit.The following examples demonstrate binding data to an ItemsControl. The first example creates a class called MyData that is a simple string collection.

The following illustration shows the ListBox control created in the previous example. The following example demonstrates how to populate an ItemsControl by using the Items property. The example adds the following different types of items to the ListBox :. A DateTime object. A UIElement object. A Panel control that contains other UIElement objects. The following illustration shows the ListBox created in the previous example.

The following example illustrates how to use the different styling and templating-related properties that are provided by the ItemsControl. The ItemsControl in this example is bound to a collection of Task objects. For demonstration purposes, the styles and templates in this example are all declared inline. An ItemsControl is a type of Control that can contain multiple items, such as strings, objects, or other elements. The following illustration shows a ListBox control that contains the following different types of items:.

A Panel control that contains an Ellipse and a TextBlock. ListBox that contains multiple types of objects. Use either the Items or the ItemsSource property to specify the collection to use to generate the content of your ItemsControl. You can set the ItemsSource property to any type that implements IEnumerable. ItemsSource is typically used to display a data collection or to bind an ItemsControl to a collection object.

If you do not want to use an object that implements IEnumerable to populate the ItemsControlyou can add items by using the Items property. The items in an ItemsControl can have different types.

For example, a ListBox can contain one item that is a string and another item that is an Image. When the ItemsSource property is set, the Items collection is set to read-only and fixed-size. This means that you cannot add items to the collection directly.

When ItemsSource is in use, setting the property to null removes the collection and restores usage to Itemswhich will be an empty ItemCollection.

Each ItemsControl type has a corresponding item container type. The corresponding item container for each ItemsControl appends Item to its name. You can explicitly create a container type for each item in the ItemsControlbut it is not necessary. When you do not explicitly create the container type, one is generated that contains a data item in the item collection.

For example, if you bind a collection of string objects to the ItemsSource property of a ListBoxyou do not explicitly create ListBoxItem objects, but the ListBox will generate one for each string. You can access a generated item container by using the ItemContainerGenerator property. Certain features of UI Automation do not work correctly when an ItemsControl contains duplicate objects. If an object appears multiple times, only the first instance appears in the automation tree. Two objects x and y are considered to be duplicates if Object.

Equals x, y returns true. While an object x is in use by an ItemsControl the value returned by x. GetHashCode must not change. Changes to this value are unsupported, and lead to unpredictable behavior. Dependency properties for this control might be set by the control's default style. If a property is set by a default style, the property might change from its default value when the control appears in the application.Gets or sets the Style that is applied to the container element generated for each item.

The Style that is applied to the container element generated for each item. The default is null.

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The following example demonstrates how to use this property. Consider the following data-bound ListBox :. To create a style for the elements that contain the data items, create a ListBoxItem style, as shown in the following example.

The style is applied to all ListBoxItem elements within the scope the style is defined in. Therefore, an alternative to the preceding is to set the ItemContainerStyle property of the ListBox to the defined style.

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To do that, give the ListBoxItem style an x:Key so it is available as a resource:. Next, set the ItemContainerStyle property to the resource, as in the following example:. Both of the preceding scenarios produce the same result. However, one of the advantages of making the style available as a resource is that you can reuse the style. Setting the ItemContainerStyle property explicitly can also provide greater readability.

The ItemsControl

For the complete example, see Introduction to Styling and Templating Sample. The following example is designed to illustrate the function of the different styling and templating related properties provided by the ItemsControl. The ItemsControl in this example is bound to a collection of Task objects.

itemscontrol

For demonstration purposes, the styles and templates in this example are all declared inline. You use this property or the ItemContainerStyleSelector property to set a style to affect the appearance of the elements that contain the data items. The ItemsControl provides great flexibility for visual customization and provides many styling and templating properties. To affect the layout of the items, use the ItemsPanel property. If you are using grouping on your control, you can use the GroupStyle or GroupStyleSelector property.

Unless the styles themselves contain references to potential run-time references such as system resources or user preferences, StaticResource reference to a style is usually recommended for performance.

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StyleResourceKey x:Key string value referring to the style being requested as a resource. Skip to main content. Exit focus mode. Items Control. Controls Assembly: PresentationFramework. Is this page helpful? Yes No. Any additional feedback? Skip Submit.Gets or sets a collection used to generate the content of the ItemsControl. A collection that is used to generate the content of the ItemsControl. The default is null.

Content Model: This property may be used to add items to an ItemsControl. To bind an ItemsControl to a collection object, use the ItemsSource property. Note that the ItemsSource property supports OneWay binding by default. When the ItemsSource property is set, the Items collection is made read-only and fixed-size. When ItemsSource is in use, setting the property to null removes the collection and restores usage to Itemswhich will be an empty ItemCollection.

When ItemsSource is not in use, the value of this property is nulland setting it to null has no effect. In most cases you do not need to implement your own collections.

See Binding Markup Extension for more information.

itemscontrol

Skip to main content. Exit focus mode. Items Control. Controls Assembly: PresentationFramework. Note In most cases you do not need to implement your own collections. Is this page helpful? Yes No. Any additional feedback? Skip Submit.WPF has a wide range of controls for displaying a list of data. They come in several shapes and forms and vary in how complex they are and how much work they perform for you.

The simplest variant is the ItemsControl, which is pretty much just a markup-based loop - you need to apply all the styling and templating, but in many cases, that's just what you need. Let's kick off with a very simple example, where we hand-feed the ItemsControl with a set of items.

This should show you just how simple the ItemsControl is:. As you can see, there is nothing that shows that we're using a control for repeating the items instead of just manually adding e. If you click on one of the items, nothing happens, because there's no concept of selected item s or anything like that.

Of course the ItemsControl is not meant to be used with items defined in the markup, like we did in the first example. Like pretty much any other control in WPF, the ItemsControl is made for data binding, where we use a template to define how our code-behind classes should be presented to the user.

To demonstrate that, I've whipped up an example where we display a TODO list to the user, and to show you just how flexible everything gets once you define your own templates, I've used a ProgressBar control to show you the current completion percentage. First some code, then a screenshot and then an explanation of it all:. The most important part of this example is the template that we specify inside of the ItemsControl, using a DataTemplate tag inside of the ItemsControl.

We add a Grid panel, to get two columns: In the first we have a TextBlock, which will show the title of the TODO item, and in the second column we have a ProgressBar control, which value we bind to the Completion property.

The template now represents a TodoItem, which we declare in the Code-behind file, where we also instantiate a number of them and add them to a list.

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In the end, this list is assigned to the ItemsSource property of our ItemsControl, which then does the rest of the job for us. Each item in the list is displayed by using our template, as you can see from the resulting screenshot.

In the above examples, all items are rendered from top to bottom, with each item taking up the full row. This happens because the ItemsControl throw all of our items into a vertically aligned StackPanel by default.

itemscontrol

It's very easy to change though, since the ItemsControl allows you to change which panel type is used to hold all the items. Here's an example:. We specify that the ItemsControl should use a WrapPanel as its template by declaring one in the ItemsPanelTemplate property and just for fun, we throw in an ItemTemplate that causes the strings to be rendered as buttons.

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You can use any of the WPF panels, but some are more useful than others. Another good example is the UniformGrid panel, where we can define a number of columns and then have our items neatly shown in equally-wide columns:. Once you start using the ItemsControl, you might run into a very common problem: By default, the ItemsControl doesn't have any scrollbars, which means that if the content doesn't fit, it's just clipped.I recently wanted to lookup some ItemsControl examples, and was was quite surprised that my good friend Google was unable to find me any good sites.

A button is a simple example, however your DataTemplates can be and frequently are far more complex than a single element.

Now suppose you want to display your items in something other than a Vertical StackPanel. The ItemContainerStyle can be used to modify the style of all items in the ItemsControl, however it does not apply this style to the ItemTemplate item, but rather the ContentPresenter that wraps each item See Snoop Screenshot above. Row and Grid. Column bindings to my Button, you would find that the items do not show up in the correct Grid cell. Note : For all the screenshots above I was binding to an ObservableCollection of strings, however for the last one I created a custom class that had 3 properties: Name, ColumnIndex, and RowIndex.

You can follow any responses to this entry through the RSS 2. You can leave a responseor trackback from your own site. Can I see C part of this project? Hi Slava, do you have the DataContext set correctly?

That would be my best guess as to the problem. Good luck! I have struggled with Dynamically creating temples and styles but I run into limitations. How do I build a dynamic Grid and define the Buttons? I started using FactoryElements but have found that it is no longer supported.

Hi Mark, an ItemsControl would be well suited for something like this.

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In regards to a dynamically sized grid, you could use an attached property like this to bind the RowCount and ColumnCount as well. Good luck with it! Hi Rachel, can you explain why you did it this way? I figured this out myself too. Actually my binding was not correct somehow. I corrected that and then was able to know which button was clicked. Hi Rachel, Can we make the Items in Itemscontrol re size independently ie.

I have a list of viewmodles that has list of items,If i expand one item it is re sizing all the other items but i dont want that. Thnaks, RK. I have question about how to render controls dynamically. You can view a sample of the sort of code I would use here. Hello Thanks a lot for such a nice article. I have one small issue with this. Actually i have an expander instead of Textbox or button as showed by you.


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