Lecture # 6...Windows Phone Applying Data Binding 20 Windows Phone One Way binding for the answer 21...

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Engr. Ali Javed 11 th March, 2014 Lecture # 6

Transcript of Lecture # 6...Windows Phone Applying Data Binding 20 Windows Phone One Way binding for the answer 21...

Page 1: Lecture # 6...Windows Phone Applying Data Binding 20 Windows Phone One Way binding for the answer 21 Windows Phone Databindingand the DataContext 22

Engr. Ali Javed 11th March, 2014

Lecture # 6

Page 2: Lecture # 6...Windows Phone Applying Data Binding 20 Windows Phone One Way binding for the answer 21 Windows Phone Databindingand the DataContext 22

Windows Phone

Instructor’s Information Instructor: Engr. Ali Javed

Assistant Professor

Department of Software Engineering

U.E.T Taxila

Email: [email protected]

Contact No: +92-51-9047747

Office hours: Monday, 09:00 -11:00, Office # 7 S.E.D

Engr. Ali Javed

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Windows Phone

Course Information

Course Name: Mobile Application Development

Course Code: SE-5020

Course Link: http://web.uettaxila.edu.pk/CMS/SP2014/seMADms/

Engr. Ali Javed

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Page 5: Lecture # 6...Windows Phone Applying Data Binding 20 Windows Phone One Way binding for the answer 21 Windows Phone Databindingand the DataContext 22

Windows Phone

Data Binding

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Page 6: Lecture # 6...Windows Phone Applying Data Binding 20 Windows Phone One Way binding for the answer 21 Windows Phone Databindingand the DataContext 22

Windows Phone

One Way Data Binding

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Windows Phone

Two Way Data Binding

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Windows Phone

Creating an Adder class

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Windows Phone

Creating an object to bind to

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public class AdderClass{

private int topValue;public int TopValue{

get { return topValue; }set { topValue = value; }

}

// repeat for bottomValue

public int AnswerValue{

get { return topValue + bottomValue;}}

}

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Windows Phone

The AdderClass

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Adding Notification Behaviour

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public interface INotifyPropertyChanged{

// Summary:// Occurs when a property value changes.event PropertyChangedEventHandler PropertyChanged;

}

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Windows Phone

Silverlight display elements

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PropertyChanged(this,new PropertyChangedEventArgs("AnswerValue"));

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Windows Phone

Reading back the property

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public int AnswerValue{

get{

return topValue + bottomValue;}

}

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Windows Phone

Demo

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Windows Phone

Binding a class to the xaml

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xmlns:local="clr-namespace:AddingMachine"

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Windows Phone

Mapping a class to a resource

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<phone:PhoneApplicationPage.Resources><local:AdderClass x:Key="AdderClass" />

</phone:PhoneApplicationPage.Resources>

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Windows Phone

Adding the resource to an element

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<Grid x:Name="LayoutRoot" Background="Transparent"DataContext="{StaticResource AdderClass}">

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Windows Phone

Business Objects and Silverlight

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Windows Phone

Binding the top line to AdderClass

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Windows Phone

Applying Data Binding

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One Way binding for the answer

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Windows Phone

Databinding and the DataContext

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<TextBox Height="72" HorizontalAlignment="Left"Margin="8,19,0,0" Name="firstNumberTextBox" Text="{BindingTopValue, Mode=TwoWay}" VerticalAlignment="Top"Width="460" TextAlignment="Center" >

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Windows Phone

Databinding and the DataContext

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// Constructorpublic MainPage(){

InitializeComponent();

AdderClass adder = new AdderClass();ContentGrid.DataContext = adder;

}

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Windows Phone

Demo

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Session 4.4

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Windows Phone

Topics

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Customer Manager

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Application Data

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Windows Phone

The Customer class

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public class Customer{

public string Name { get; set; }public string Address { get; set; }public int ID { get; set; }

public Customer(string inName, string inAddress, int inID)

{Name = inName;Address = inAddress;ID = inID;

}}

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Windows Phone

The Customers class

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public class Customers{

public string Name { get; set; }

public Customers(string inName) {

Name = inName;CustomerList = new List<Customer>();

}

public List<Customer> CustomerList;

}

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Windows Phone

Sample Data

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Sample Data

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string [] firstNames = new string [] { "Rob", "Jim","Joe", "Nigel", "Sally", "Tim"} ;

string[] lastsNames = new string[] { "Smith", "Jones","Bloggs", "Miles", "Wilkinson", "Brown" };

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Sample Data Generator

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public static Customers MakeTestCustomers(){

int id = 0;

foreach (string lastName in lastsNames) {foreach (string firstname in firstNames) {

//Construct a customer namestring name = firstname + " " + lastName;//Add the new customer to the listresult.CustomerList.Add(new Customer(name,

name + "'s House", id));// Increase the ID for the next customerid++;

}}return result;

}

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Windows Phone

Displaying a List using a StackPanel

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Windows Phone

Sample Data

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<StackPanel HorizontalAlignment="Left"Margin="0,0,0,0" Name="customersStackPanel"VerticalAlignment="Top"/>

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Sample Data

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foreach (Customer c in customers.CustomerList){

TextBlock customerBlock = new TextBlock();customerBlock.Text = c.Name;customersStackPanel.Children.Add(customerBlock);

}

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Windows Phone

StackPanel Children

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Stackpanel Display

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Windows Phone

Adding a ScrollViewer

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<ScrollViewer><StackPanel HorizontalAlignment="Left“

Margin="0,0,0,0" Name="customersStackPanel“VerticalAlignment="Top" />

</ScrollViewer>

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Windows Phone

Demo

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Windows Phone

The Silverlight ListBox element

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The ListBox and Data Binding

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Binding a Single Item

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<TextBlock Height="46" HorizontalAlignment="Left"Margin="158,208,0,0" Name="resultTextBlock"Text="{Binding Path=AnswerValue}"VerticalAlignment="Top" FontSize="30" Width="160"TextAlignment="Center" />

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Binding Complicated Data

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Windows Phone

Creating a DataTemplate

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<DataTemplate><StackPanel>

<TextBlock Text="{Binding Name}"/><TextBlock Text="{Binding Address}"/>

</StackPanel></DataTemplate>

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Windows Phone

Using a DataTemplate in a ListBox

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<ListBox Name="customerList"><ListBox.ItemTemplate>

<DataTemplate><StackPanel>

<TextBlock Text="{Binding Name}"/><TextBlock Text="{Binding Address}"/>

</StackPanel></DataTemplate>

</ListBox.ItemTemplate></ListBox>

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Windows Phone

Setting the ItemSource

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customers = Customers.MakeTestCustomers();customerList.ItemsSource = customers.CustomerList;

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Displaying the ListBox

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An Improved DataTemplate

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<DataTemplate><StackPanel>

<TextBlock Text="{Binding Name}"Style="{StaticResource PhoneTextExtraLargeStyle}"/><TextBlock Text="{Binding Address}"Style="{StaticResource PhoneTextSubtleStyle}"/>

</StackPanel></DataTemplate>

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Selecting Items in a ListBox

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Windows Phone

Selection Changed Events

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<ListBox Name="customerList"SelectionChanged="customerList_SelectionChanged">

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Selection Changed Events

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private void customerList_SelectionChanged(object sender,SelectionChangedEventArgs e)

{// when we get here the user has selected a customerCustomer selectedCustomer =

customerList.SelectedItem as Customer;

MessageBox.Show(selectedCustomer.Name + " is selected");

}

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Windows Phone

Demo

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Windows Phone

Referencehttp://www.techopedia.com/definition/24291/isolated-storage-net

http://msdn.microsoft.com/en-us/library/3ak841sy(v=vs.110).aspx

54Engr. Ali Javed

http://www.techopedia.com/definition/24291/isolated-storage-net
http://msdn.microsoft.com/en-us/library/3ak841sy(v=vs.110).aspx
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55Engr. Ali Javed

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