Zooming Functionality in Windows Phone 7

<phone:PhoneApplicationPage
x:Class="PhoneApp2.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">

<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>

<!--TitlePanel contains the name of the application and page title-->
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
<TextBlock x:Name="ApplicationTitle" Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock x:Name="PageTitle" Text="zoom In/zoom out" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}" FontSize="56" />
</StackPanel>

<!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<Image Height="264" HorizontalAlignment="Left" Margin="126,79,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="200" Source="/PhoneApp2;component/Images/Penguins.jpg" />
<Button Content="Zoom In" Height="72" HorizontalAlignment="Left" Margin="25,497,0,0" Name="button1" VerticalAlignment="Top" Width="146" Click="zoom_in" />
<Button Content="Zoom Out" Height="72" HorizontalAlignment="Left" Margin="238,497,0,0" Name="button2" VerticalAlignment="Top" Width="171" Click="zoom_out"/>
</Grid>
</Grid>
</phone:PhoneApplicationPage>

Step 4 : To manipulate the Click event of buttons, we will customize the source code of the MainPage.xaml.cs file.

Code

private void zoom_out(object sender, RoutedEventArgs e)
{
if(j>0)
{
image1.Height -= 50;
image1.Width -= 50;
j--;
i = j;
}
}
private void zoom_in(object sender, RoutedEventArgs e)
{
if(i<2)
{
image1.Height += 50;
image1.Width += 50;
i++;
j = i;
}
}

Step 5 : The final source code of the MainPage.xaml.cs file is:

Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;

namespace PhoneApp2
{
public partial class MainPage : PhoneApplicationPage
{
int i = 0;
int j = 0;// Constructor
public MainPage()
{
InitializeComponent();
}

private void zoom_out(object sender, RoutedEventArgs e)
{
if(j>0)
{
image1.Height -= 50;
image1.Width -= 50;
j--;
i = j;
}
}

private void zoom_in(object sender, RoutedEventArgs e)
{
if(i<2)
{
image1.Height += 50;
image1.Width += 50;
i++;
j = i;
}
}
}
}

Step 6 : Press F5 to run the application.

Output

Resources