Tugas 4 PBKK - Menerapkan MVVM Di Windows Presentation Foundation (WPF)

Kali ini kita akan mencoba untuk menerapkan MVVM pada Windows Presentation Foundation. Berikut langkahnya:


1. Buka Microsoft Visual Studio
2. Pilih Create a new project

3. Pilih WPF App (.NET Framework) sebagai template project, lalu klik Next

4. Buat class baru dengan nama ItemPenjualan, Klik kanan pada nama project, pilih Add lalu "Class.." Setelahnya, pilih Class dan klik Add

   
Berikut isi dari classnya:

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace LatihanMVVM
{
    public class ItemPenjualan
    {
        public ItemPenjualan()
        {
            DiskonPersen = 0;
        }

        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public long Id { get; set; }

        [StringLength(50)]
        public string NamaBarang { get; set; }

        public int Jumlah { get; set; }

        public decimal Harga { get; set; }

        public decimal DiskonPersen { get; set; }

        public decimal Total()
        {
            decimal total = Jumlah * Harga;
            return total - (DiskonPersen / 100 * total);
        }
    }
}

5. Selanjutnya ubah kode pada MainWindow.xaml


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<Window x:Class="LatihanMVVM.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="356" Width="528">

    <Window.Resources>
        <Style TargetType="TextBlock">
            <Setter Property="FontSize" Value="20" />
            <Setter Property="FontFamily" Value="Myriad Pro" />
            <Setter Property="FontWeight" Value="SemiBold" />
            <Setter Property="Background">
                <Setter.Value>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FF508FC4" Offset="0" />
                        <GradientStop Color="#FF6F94AD" Offset="1" />
                        <GradientStop Color="#FFC7F3FF" Offset="0.302" />
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
            <Setter Property="Foreground">
                <Setter.Value>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FF5252CE" Offset="0" />
                        <GradientStop Color="#FF0000DB" Offset="0.953" />
                        <GradientStop Color="#FF6363CB" Offset="0.337" />
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
        </Style>

        <Style TargetType="Label">
            <Setter Property="FontSize" Value="14" />
        </Style>

        <Style TargetType="TextBox">
            <Setter Property="Language" Value="in-IN" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Border x:Name="customBorder" Background="{TemplateBinding Background}" CornerRadius="5" BorderThickness="2" BorderBrush="Gray">
                            <ScrollViewer x:Name="PART_ContentHost"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsKeyboardFocused" Value="True">
                                <Setter TargetName="customBorder" Property="Effect">
                                    <Setter.Value>
                                        <DropShadowEffect BlurRadius="10" ShadowDepth="0" Color="#578EC9"/>
                                    </Setter.Value>
                                </Setter>
                            </Trigger>
                            <Trigger Property="IsKeyboardFocused" Value="False">
                                <Setter Property="Foreground" Value="Gray" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="Validation.ErrorTemplate">
                <Setter.Value>
                    <ControlTemplate>
                        <StackPanel Orientation="Horizontal">
                            <AdornedElementPlaceholder />
                            <TextBlock Text="Perlu diperbaiki!" Padding="3" Foreground="Red" />
                        </StackPanel>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <Style TargetType="Button">
            <Setter Property="Background" Value="#DEF2FC" />
            <Setter Property="Foreground" Value="Black" />
            <Setter Property="FontSize" Value="15"/>
            <Setter Property="Effect">
                <Setter.Value>
                    <DropShadowEffect BlurRadius="10" ShadowDepth="0" Color="#578EC9"/>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="customBorder" Background="{TemplateBinding Background}" CornerRadius="4" BorderThickness="2" BorderBrush="Gray">
                            <ContentPresenter Content="{TemplateBinding Content}" HorizontalAlignment="Center" />
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Background" Value="#2394CC" />
                                <Setter Property="Foreground" Value="White" />
                            </Trigger>
                            <Trigger Property="IsPressed" Value="True">
                                <Setter Property="Effect" Value="{x:Null}" />
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Property="Effect">
                                    <Setter.Value>
                                        <BlurEffect Radius="3"  />
                                    </Setter.Value>
                                </Setter>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>

    <Grid>
        <Label Content="Nama Barang:" Height="29" HorizontalAlignment="Left" Margin="0,49,0,0" Name="label2" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="107" />
        <TextBox Height="23" HorizontalAlignment="Stretch" Margin="112,55,12,0" Name="textBox1" Text="{Binding Path=NamaBarang}" VerticalAlignment="Top" />
        <Label Content="Jumlah:" Height="27" HorizontalAlignment="Left" Margin="1,86,0,0" Name="label3" VerticalAlignment="Top" Width="106" HorizontalContentAlignment="Right" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,90,0,0" Name="textBox2" Text="{Binding Path=Jumlah, StringFormat={}{0:#,0}}" VerticalAlignment="Top" Width="62" />
        <Label Content="Harga:" Height="28" HorizontalAlignment="Left" Margin="12,122,0,0" Name="label4" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,127,0,0" Name="textBox3" Text="{Binding Path=Harga, StringFormat={}{0:C}}" VerticalAlignment="Top" Width="124" />
        <Button Content="Simpan" Height="27" HorizontalAlignment="Left" Margin="207,228,0,0" Name="button1" Command="{Binding SimpanCommand}" VerticalAlignment="Top" Width="82" />
        <Label Content="Diskon (%):" Height="33" HorizontalAlignment="Left" Margin="12,161,0,0" Name="label5" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="113,165,0,0" Name="textBox4" Text="{Binding Path=DiskonPersen, StringFormat={}{0:#.#}}" VerticalAlignment="Top" Width="62" />
        <Label Content="Total:" Height="33" HorizontalAlignment="Left" Margin="12,194,0,0" Name="label6" VerticalAlignment="Top" HorizontalContentAlignment="Right" Width="95" />
        <Label Content="{Binding Path=Total}" Height="28" HorizontalAlignment="Left" Margin="113,194,0,0" Name="label7" VerticalAlignment="Top" Width="402" />
        <TextBlock Height="28" HorizontalAlignment="Stretch" Name="textBlock1" Text="Tambah Item Penjualan" VerticalAlignment="Top" TextAlignment="Center" Margin="0,12,0,0" />

        <Grid.Background>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="#FFB7CEFF" Offset="0.192" />
                <GradientStop Color="White" Offset="1" />
                <GradientStop Color="#FF1648AD" Offset="0" />
            </LinearGradientBrush>
        </Grid.Background>

    </Grid>
</Window>

6. Membuat class baru dengan nama ItemPenjualanViewModel

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Windows.Input;
using System.Windows;

namespace LatihanMVVM
{
    public class ItemPenjualanViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private ItemPenjualan model;
        private ICommand simpanCommand;

        public ItemPenjualanViewModel(ItemPenjualan itemPenjualan = null)
        {
            this.model = itemPenjualan ?? new ItemPenjualan();
        }

        public ICommand SimpanCommand
        {
            get
            {
                if (this.simpanCommand == null)
                {
                    this.simpanCommand = new SimpanCommand(this);
                }
                return this.simpanCommand;
            }
        }

        public string NamaBarang
        {
            get { return model.NamaBarang; }
            set
            {
                if (value != model.NamaBarang)
                {
                    model.NamaBarang = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("NamaBarang"));
                }
            }
        }

        public int Jumlah
        {
            get { return model.Jumlah; }
            set
            {
                if (value != model.Jumlah)
                {
                    model.Jumlah = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("Jumlah"));
                    PropertyChanged(this, new PropertyChangedEventArgs("Total"));
                }
            }
        }

        public decimal Harga
        {
            get { return model.Harga; }
            set
            {
                if (value != model.Harga)
                {
                    model.Harga = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("Harga"));
                    PropertyChanged(this, new PropertyChangedEventArgs("Total"));
                }
            }
        }

        public decimal DiskonPersen
        {
            get { return model.DiskonPersen; }
            set
            {
                if (value != model.DiskonPersen)
                {
                    model.DiskonPersen = value;
                    PropertyChanged(this, new PropertyChangedEventArgs("DiskonPersen"));
                    PropertyChanged(this, new PropertyChangedEventArgs("Total"));
                }
            }
        }

        public string Total
        {
            get
            {
                decimal? total = model.Total();
                if (!total.HasValue)
                {
                    return "-";
                }
                else
                {
                    return total.Value.ToString("C");
                }
            }
        }

        public ItemPenjualan Model
        {
            get { return this.model; }
        }
    }

    public class SimpanCommand : ICommand
    {

        private ItemPenjualanViewModel viewModel;

        public SimpanCommand(ItemPenjualanViewModel viewModel)
        {
            this.viewModel = viewModel;
        }

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }

        public bool CanExecute(object parameter)
        {
            return viewModel.Model.Total() > 0;
        }

        public void Execute(object parameter)
        {
            using (var db = new LatihanContext())
            {
                db.Database.Log = Console.Write;
                db.DaftarItemPenjualan.Add(viewModel.Model);
                db.SaveChanges();
                MessageBox.Show("Data berhasil disimpan ke database");
            }
        }

    }
}

7. Ubah kode pada MainWindow.xaml.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace LatihanMVVM
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = new ItemPenjualanViewModel();
        }
    }
}

8. Selanjutnya install MySQL Connector/.NET dari http://dev.mysql.com/downloads/connector/net/6.8.html

9. Tambahkan reference MySql.Data.Entity.EF6 dengan cara klik kanan nama project, pilih Add, "Reference..". Lalu pada bagian Assemblies cari MySql.Data.Entity.EF6 lalu klik OK




9. Sebelum melanjutkan, kita perlu menambahkan package Entity Framework. Buka Package Manager Console lalu ketikkan perintah berikutInstall-Package EntityFramework -Version 6.4.4

Install-Package EntityFramework -Version 6.4.4

10. Ubah kode pada App.config

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<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
  </startup>
	<entityFramework>
		<providers>
			<provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
		</providers>
	</entityFramework>
	<connectionStrings>
		<add name="LatihanContext" connectionString="server=localhost; database=pbkk_mvvm; uid=root;" providerName="MySql.Data.MySqlClient" />
	</connectionStrings>
</configuration>

11. Buat class LatihanContext

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using System.Data.Entity;

namespace LatihanMVVM
{

    [DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
    class LatihanContext : DbContext
    {
        public DbSet<ItemPenjualan> DaftarItemPenjualan { get; set; }
    }
}

12. Buat class MyHistoryContext

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Entity.Migrations.History;
using System.Data.Common;
using System.Data.Entity;

namespace LatihanMVVM
{
    public class MyHistoryContext : HistoryContext
    {
        public MyHistoryContext(DbConnection dbConnection, string defaultSchema)
            : base(dbConnection, defaultSchema)
        {
        }

        protected override void OnModelCreating(System.Data.Entity.DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Entity<HistoryRow>().Property(p => p.MigrationId).HasMaxLength(100).IsRequired();
            modelBuilder.Entity<HistoryRow>().Property(p => p.ContextKey).HasMaxLength(200).IsRequired();
        }
    }

    public class ModelConfiguration : DbConfiguration
    {
        public ModelConfiguration()
        {
            SetHistoryContext("MySql.Data.MySqlClient", (c, s) => new MyHistoryContext(c, s));
        }
    }
}

13. Berikut tampilan program dan hasil pada database:













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