Silverlight - Content Model


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The buttons offer a form of content to the model content. Models crop up a lot in controls. The idea is simple. It will accept any content and not just text. If you want to create a truly exotic button, you could even place other content controls such as text boxes and buttons inside (and nest still elements inside these). It is doubtful that such an interface would make much sense, but it is possible.

Let us have a look at a simple example with button, inside button other content controls.

<UserControl x:Class = "ContentModel.MainPage" 
   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" 
   mc:Ignorable = "d" 
   d:DesignHeight = "300" d:DesignWidth = "400">
   
   <Grid x:Name = "LayoutRoot" Background = "White"> 
	
      <Button Margin = "3" Height = "70" Width = "215"> 
         <Grid Margin = "5"> 
            <Polygon Points = "100,25 125,0 200,25 125,50" Fill = "LightSteelBlue" /> 
            <Polygon Points = "100,25 75,0 0,25 75,50" Fill = "LightGray"/> 
         </Grid> 
      </Button> 
		
   </Grid> 
	
</UserControl>

When the above code is compiled and executed, you will see the following button.

Content Controls

RangeControl

The scrollbar and slider controls are closely related. They both allow the user to choose an input value from a particular range. Conventionally, these controls signify different things. Scrollbars are normally used to set the position into a scrotal area whereas, the slider is used to specify some value or setting. These are just conventions; the controls have similar behaviors and APIs.

The range controls are simple to use. You specify the minimum and maximum values to indicate the range of values you would like the slider to represent. The Value property will vary as the use of drags varies.

The hierarchical inheritance of Slider class is as follows −

Inheritance of Slider

Given below are the commonly used properties of Slider.

Sr. No. Property & Description
1

Header

Gets or sets the content for the control's header.

2

HeaderProperty

Identifies the Header dependency property.

3

HeaderTemplate

Gets or sets the DataTemplate used to display the content of the control's header.

4

HeaderTemplateProperty

Identifies the HeaderTemplate dependency property.

5

IntermediateValue

Gets or sets the value of the Slider while the user is interacting with it, before the value is snapped to either the tick or step value. The SnapsTo property specifies the value of slider.

6

IntermediateValueProperty

Identifies the IntermediateValue dependency property.

7

IsDirectionReversed

Gets or sets a value that indicates the direction of increasing value.

8

IsDirectionReversedProperty

Identifies the IsDirectionReversed dependency property.

9

IsThumbToolTipEnabled

Gets or sets a value that determines whether the slider value is shown in a tool tip for the Thumb component of the Slider.

10

IsThumbToolTipEnabledProperty

Identifies the IsThumbToolTipEnabled dependency property.

11

Orientation

Gets or sets the orientation of a Slider.

12

OrientationProperty

Identifies the Orientation dependency property.

13

StepFrequency

Gets or sets the value part of a value range that steps should be created for.

14

StepFrequencyProperty

Identifies the StepFrequency dependency property.

15

ThumbToolTipValueConverter

Gets or sets the converter logic that converts the range value of the Slider into tool tip content.

16

ThumbToolTipValueConverterProperty

Identifies the ThumbToolTipValueConverter dependency property.

17

TickFrequency

Gets or sets the increment of the value range that ticks should be created for.

18

TickFrequencyProperty

Identifies the TickFrequency dependency property.

19

TickPlacement

Gets or sets a value that indicates where to draw tick marks in relation to the track.

20

TickPlacementProperty

Identifies the TickPlacement dependency property.

Given below are the commonly used events in Slider class.

Sr. No. Event & Description
1

ManipulationCompleted

Occurs when a manipulation on the UIElement is complete. (Inherited from UIElement)

2

ManipulationDelta

Occurs when the input device changes position during a manipulation. (Inherited from UIElement)

3

ManipulationInertiaStarting

Occurs when the input device loses contact with the UIElement object during a manipulation and inertia begins. (Inherited from UIElement)

4

ManipulationStarted

Occurs when an input device begins a manipulation on the UIElement. (Inherited from UIElement)

5

ManipulationStarting

Occurs when the manipulation processor is first created. (Inherited from UIElement)

6

ValueChanged

Occurs when the range value changes. (Inherited from RangeBase)

Given below are the commonly used methods in Slider class.

Sr. No. Method & Description
1

OnManipulationCompleted

Called before the ManipulationCompleted event occurs. (Inherited from Control)

2

OnManipulationDelta

Called before the ManipulationDelta event occurs. (Inherited from Control)

3

OnManipulationInertiaStarting

Called before the ManipulationInertiaStarting event occurs. (Inherited from Control)

4

OnManipulationStarted

Called before the ManipulationStarted event occurs. (Inherited from Control)

5

OnManipulationStarting

Called before the ManipulationStarting event occurs. (Inherited from Control)

6

OnMaximumChanged

Called when the Maximum property changes. (Inherited from RangeBase)

7

OnMinimumChanged

Called when the Minimum property changes. (Inherited from RangeBase)

8

OnValueChanged

Fires the ValueChanged routed event. (Inherited from RangeBase)

9

SetBinding

Attaches a binding to a FrameworkElement, using the provided binding object. (Inherited from FrameworkElement)

10

SetValue

Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject)

Example

Let us have a look at a simple example in which a slider and an ellipse are added and the slider controls the width of the ellipse.

<UserControl x:Class = "SliderExample.MainPage" 
   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"  
   mc:Ignorable = "d" d:DesignWidth = "640" d:DesignHeight = "480"> 
   
   <Grid x:Name = "LayoutRoot">
	
      <Grid.RowDefinitions> 
         <RowDefinition Height = "Auto" /> 
         <RowDefinition /> 
      </Grid.RowDefinitions>  
		
      <Slider Minimum = "1" Maximum = "400" Value = "1" 
         ValueChanged = "Slider_ValueChanged" />  
			
      <Ellipse Grid.Row = "1" Fill = "Aqua" Width = "1" x:Name = "myEllipse" /> 
		
   </Grid> 
	
</UserControl>

Given below is the value changed event implementation is C#.

using System.Windows; 
using System.Windows.Controls; 
 
namespace SliderExample { 

   public partial class MainPage : UserControl { 
	
      public MainPage() { 
         InitializeComponent(); 
      }
	  
      private void Slider_ValueChanged(object sender, 
         RoutedPropertyChangedEventArgs<double> e) { 
			
            if (myEllipse != null) { 
               myEllipse.Width = e.NewValue; 
            } 
      } 
   } 
}

When the above code is compiled and executed, you will see the following output. As you can see, when you move the slider from left to right, the ellipse width increases.

Add Slider And Ellipse

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