Concepts Animation Interview Questions & FAQs

Questions and answers for Concepts Animation.

7. Concepts Animation

7.1 What are the requirements for a property to be animated?

7.2 How do I trigger an animation when the data in the control is changed?

7.1How do I trigger an animation when the data in the control is changed?

WPF enables users to apply animations to objects by applying animations on properties. For a property to have animation capabilities, it should have the following requirements.

The property should be a dependency property.
It must belong to class that inherits from the DependencyObject class and implements the IAnimatable interface.
There must be a compatible Animation type available for the property. For e.g. the Double type property can be animated using the DoubleAnimation. Similarly, the property to be animated should contain the corresponding animation type.

7.2How do I trigger an animation when the data in the control is changed?

Animations can be applied to the objects in WPF application when the data in the control changes using the DataTriggers. The following lines of code is used to apply animations using a DataTrigger

[XAML]


															<TextBlock Text="WPF Application" Name="tb1" 
																Foreground="Blue" FontSize="28" TextAlignment="Center" Height="50" 
																VerticalAlignment="Top">
															
																







															<TextBlock.Style>
															     
																<Style>
															<Style.Triggers>
															<DataTrigger Binding="{Binding 
																ElementName=cb1,Path=IsChecked}" Value="true">
															<DataTrigger.EnterActions>
															<BeginStoryboard>
															<Storyboard>
															<DoubleAnimation Storyboard.TargetProperty="Opacity" 
																From="0" To="1" Duration="0:0:1" AutoReverse="True" RepeatBehavior="Forever" 
																/>
															</Storyboard>
															</BeginStoryboard>
															</DataTrigger.EnterActions>
															<DataTrigger.ExitActions>
															<BeginStoryboard>
															<Storyboard FillBehavior="Stop">
															<DoubleAnimation Storyboard.TargetProperty="Opacity" To="1" 
																Duration="0:0:1" />
															</Storyboard>
															</BeginStoryboard>
															</DataTrigger.ExitActions>
															</DataTrigger>
															</Style.Triggers>
															</Style>
															</TextBlock.Style>
															</TextBlock>
															<CheckBox Name="cb1" Content="Show Animation" 
																IsChecked="True" Height="30" HorizontalAlignment="Center" />

7.3 What is Path animation?

Path animation is a type of Animation Timeline that uses a Path Geometry for animation instead of properties like From, To, By or ByUsingKeyframes. In a Path animation, the object moves along the path specified by the Path geometry. As the animation progresses, it reads the X-axis, Y-axis and angle information from the path geometry and generates the output. Path animations are useful when an object has to be animated along a complex path.

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Concepts Animation Interview Questions & FAQs

7. Concepts Animation

7.1How do I trigger an animation when the data in the control is changed?

7.2How do I trigger an animation when the data in the control is changed?

7.3 What is Path animation?