Custom rating indicator in Qt and WP7

This article demonstrates how to create a custom Rating Indicator in Qt and WP7.

Article Metadata

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Code Example

Source file: Media: RatingIndicatorWP7.zip

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Tested with

SDK: Windows Phone SDK 7.1

Devices(s): Windows Phone

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Compatibility

Platform(s): Windows Phone 7.1

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Platform Security

Signing Required: Self-Signed

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Article

Keywords: Rating Indicator

Created: somnathbanik (29 Apr 2013)

Last edited: hamishwillee (30 Nov 2012)

Introduction

In this article we will port Custom Rating Indicator using Qt Quick to WP7.

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  Custom Rating Indicator in WP7

• 

  Custom Rating Indicator in Qt

Implementation

On below you can find how to implement the Custom Rating Indicator for both Qt and WP7.

Qt

For Implementation in Qt, see article Custom Rating Indicator using Qt Quick.

WP7

Let’s create an empty WP7 project. We add a StackPanel and add five Images in it to display all the images in a row.

<StackPanel  Orientation="Horizontal" VerticalAlignment="Center" HorizontalAlignment="Center" x:Name="stackRow" Width="400">
                <Image x:Name="star1" Margin="0,0,20,0"  VerticalAlignment="Center" HorizontalAlignment="Center"
        Source="star.png"
        Stretch="None"
        RenderTransformOrigin="0.5,0.5" 
                       MouseLeftButtonDown="star1_MouseLeftButtonDown"  Opacity="1">
                    <Image.RenderTransform>
                        <CompositeTransform
                ScaleX="1" ScaleY="1"
                TranslateX="0" TranslateY="0"/>
                    </Image.RenderTransform>
                </Image>
 
                <!-- The rest of the Image elements goes here 
                To keep the code simple the repeated Image element are not added in this code snippet. 
                The complete code is available in the source code -->
 
</StackPanel>

To play with the scale of the Images we set the ScaleX and ScaleY property initially to 1 and apply it to Image’s RenderTransform property. Each Image has got an event handler. When user clicks on any of the Images the corresponding event handler gets called which then calls the displayRatingStar() method.

void displayRatingStar()
        {
            iVibrateController.Start(TimeSpan.FromMilliseconds(100));
            textBlockRating.Text = "Rating: " + rating.ToString();
            if (rating >= 1)
            {
                star1.Opacity = 1;
                star1.Height = maxHeight;
                star1.Width = maxWidth;
                star1.Stretch = Stretch.UniformToFill;
                star1.Margin = new Thickness(0, 0, 20, 0);
                initialScale = ((CompositeTransform)star1.RenderTransform).ScaleX;
                var transform = (CompositeTransform)star1.RenderTransform;
                transform.ScaleX = finalScale;
                transform.ScaleY = transform.ScaleX;
            }
            else
            {
                star1.Opacity = 0.4;
                star1.Height = minHeight;
                star1.Width = minWidth;
                star1.Stretch = Stretch.UniformToFill;
                star1.Margin = new Thickness(0, 0, 40, 0);
                initialScale = ((CompositeTransform)star1.RenderTransform).ScaleX;
                var transform = (CompositeTransform)star1.RenderTransform;
                transform.ScaleX = initialScale;
                transform.ScaleY = transform.ScaleX;
            }
 
            /* The rest of the condition check goes here 
            To keep the code simple the multiple condition statement are not added in this code snippet. 
            The complete code is available in the source code */
 
   }

In displayRatingStar() method we check the value of rating variable and according to that change the Scale of the rating Images along with the change in its Opacity. We also add VibrateController in the Image click for better user feedback, which is optional. To know more on how to add VibrateController in UI element you can follow this Article.

Source Code

• The full source code of the example is available here: File:RatingIndicatorWP7.zip