Post on 07-Oct-2020
transcript
Engr. Ali Javed 11th March, 2014
Lecture # 6
Windows Phone
Instructor’s Information Instructor: Engr. Ali Javed
Assistant Professor
Department of Software Engineering
U.E.T Taxila
Email: ali.javed@uettaxila.edu.pk
Contact No: +92-51-9047747
Office hours: Monday, 09:00 -11:00, Office # 7 S.E.D
Engr. Ali Javed
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
Windows Phone
Data Binding
5
Windows Phone
One Way Data Binding
6
Windows Phone
Two Way Data Binding
7
Windows Phone
Creating an Adder class
8
Windows Phone
Creating an object to bind to
9
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;}}
}
Windows Phone
The AdderClass
10
Windows Phone
Adding Notification Behaviour
11
public interface INotifyPropertyChanged{
// Summary:// Occurs when a property value changes.event PropertyChangedEventHandler PropertyChanged;
}
Windows Phone
Silverlight display elements
12
PropertyChanged(this,new PropertyChangedEventArgs("AnswerValue"));
Windows Phone
Reading back the property
13
public int AnswerValue{
get{
return topValue + bottomValue;}
}
Windows Phone
Demo
14
Windows Phone
Binding a class to the xaml
15
xmlns:local="clr-namespace:AddingMachine"
Windows Phone
Mapping a class to a resource
16
<phone:PhoneApplicationPage.Resources><local:AdderClass x:Key="AdderClass" />
</phone:PhoneApplicationPage.Resources>
Windows Phone
Adding the resource to an element
17
<Grid x:Name="LayoutRoot" Background="Transparent"DataContext="{StaticResource AdderClass}">
Windows Phone
Business Objects and Silverlight
18
Windows Phone
Binding the top line to AdderClass
19
Windows Phone
Applying Data Binding
20
Windows Phone
One Way binding for the answer
21
Windows Phone
Databinding and the DataContext
22
<TextBox Height="72" HorizontalAlignment="Left"Margin="8,19,0,0" Name="firstNumberTextBox" Text="{BindingTopValue, Mode=TwoWay}" VerticalAlignment="Top"Width="460" TextAlignment="Center" >
Windows Phone
Databinding and the DataContext
23
// Constructorpublic MainPage(){
InitializeComponent();
AdderClass adder = new AdderClass();ContentGrid.DataContext = adder;
}
Windows Phone
Demo
24
Session 4.4
Windows Phone
Topics
Windows Phone
Customer Manager
27
Windows Phone
Application Data
28
Windows Phone
The Customer class
29
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;
}}
Windows Phone
The Customers class
30
public class Customers{
public string Name { get; set; }
public Customers(string inName) {
Name = inName;CustomerList = new List<Customer>();
}
public List<Customer> CustomerList;
}
Windows Phone
Sample Data
31
Windows Phone
Sample Data
32
string [] firstNames = new string [] { "Rob", "Jim","Joe", "Nigel", "Sally", "Tim"} ;
string[] lastsNames = new string[] { "Smith", "Jones","Bloggs", "Miles", "Wilkinson", "Brown" };
Windows Phone
Sample Data Generator
33
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;
}
Windows Phone
Displaying a List using a StackPanel
34
Windows Phone
Sample Data
35
<StackPanel HorizontalAlignment="Left"Margin="0,0,0,0" Name="customersStackPanel"VerticalAlignment="Top"/>
Windows Phone
Sample Data
36
foreach (Customer c in customers.CustomerList){
TextBlock customerBlock = new TextBlock();customerBlock.Text = c.Name;customersStackPanel.Children.Add(customerBlock);
}
Windows Phone
StackPanel Children
37
Windows Phone
Stackpanel Display
38
Windows Phone
Adding a ScrollViewer
39
<ScrollViewer><StackPanel HorizontalAlignment="Left“
Margin="0,0,0,0" Name="customersStackPanel“VerticalAlignment="Top" />
</ScrollViewer>
Windows Phone
Demo
40
Windows Phone
The Silverlight ListBox element
41
Windows Phone
The ListBox and Data Binding
42
Windows Phone
Binding a Single Item
43
<TextBlock Height="46" HorizontalAlignment="Left"Margin="158,208,0,0" Name="resultTextBlock"Text="{Binding Path=AnswerValue}"VerticalAlignment="Top" FontSize="30" Width="160"TextAlignment="Center" />
Windows Phone
Binding Complicated Data
44
Windows Phone
Creating a DataTemplate
45
<DataTemplate><StackPanel>
<TextBlock Text="{Binding Name}"/><TextBlock Text="{Binding Address}"/>
</StackPanel></DataTemplate>
Windows Phone
Using a DataTemplate in a ListBox
46
<ListBox Name="customerList"><ListBox.ItemTemplate>
<DataTemplate><StackPanel>
<TextBlock Text="{Binding Name}"/><TextBlock Text="{Binding Address}"/>
</StackPanel></DataTemplate>
</ListBox.ItemTemplate></ListBox>
Windows Phone
Setting the ItemSource
47
customers = Customers.MakeTestCustomers();customerList.ItemsSource = customers.CustomerList;
Windows Phone
Displaying the ListBox
48
Windows Phone
An Improved DataTemplate
49
<DataTemplate><StackPanel>
<TextBlock Text="{Binding Name}"Style="{StaticResource PhoneTextExtraLargeStyle}"/><TextBlock Text="{Binding Address}"Style="{StaticResource PhoneTextSubtleStyle}"/>
</StackPanel></DataTemplate>
Windows Phone
Selecting Items in a ListBox
50
Windows Phone
Selection Changed Events
51
<ListBox Name="customerList"SelectionChanged="customerList_SelectionChanged">
Windows Phone
Selection Changed Events
52
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");
}
Windows Phone
Demo
53
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
Windows Phone
55Engr. Ali Javed
For any query Feel Free to ask