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POWhat design pattern should I use to make such dialogs?
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  1. POWhat design pattern should I use to make such dialogs?
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    copied!<p>I want to develop dialog for editing objects that make use of polymorphism. Currently I'm using this pattern:</p> <p><strong>MyObject.cs:</strong></p> <pre><code>using System; namespace WpfApplication3 { public class MyObject { public string Title { get; set; } public MySettings Settings { get; set; } } public abstract class MySettings { public abstract string GetSettingsString(); } public class MyBoolSettings : MySettings { public bool BoolSetting { get; set; } public override string GetSettingsString() { return "BoolSetting = " + BoolSetting; } } public class MyStringSettings : MySettings { public string StringSetting { get; set; } public override string GetSettingsString() { return "StringSetting = " + StringSetting; } } } </code></pre> <p><strong>MainWindow.xaml:</strong></p> <pre><code>&lt;Window x:Class="WpfApplication3.EditMyObjectDialog" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="EditMyObjectDialog" Height="350" Width="350"&gt; &lt;StackPanel Margin="20"&gt; &lt;TextBlock Text="Title" /&gt; &lt;TextBox Name="txtTitle" /&gt; &lt;RadioButton Name="rdBoolSettings" Content="BoolSettings" IsChecked="True" Margin="0, 20, 0, 0" /&gt; &lt;CheckBox Name="chBool" Content="True" Margin="20, 0, 0, 20" /&gt; &lt;RadioButton Name="rdStringSettings" Content="StringSettings" /&gt; &lt;TextBox Name="txtString" Margin="20, 0, 0, 20"/&gt; &lt;Button Content="OK" Click="OK_click" /&gt; &lt;Button Content="Cancel" Click="Cancel_click" Margin="0, 10" /&gt; &lt;/StackPanel&gt; &lt;/Window&gt; </code></pre> <p><strong>MainWindow.xaml.cs:</strong></p> <pre><code>using System.Windows; namespace WpfApplication3 { public partial class EditMyObjectDialog : Window { public MyObject Result { get; set; } public EditMyObjectDialog(MyObject objectToEdit) { InitializeComponent(); txtTitle.Text = objectToEdit.Title; if (objectToEdit.Settings is MyBoolSettings) { rdBoolSettings.IsChecked = true; chBool.IsChecked = (objectToEdit.Settings as MyBoolSettings).BoolSetting; } if (objectToEdit.Settings is MyStringSettings) { rdBoolSettings.IsChecked = true; txtString.Text = (objectToEdit.Settings as MyStringSettings).StringSetting; } } private void OK_click(object sender, RoutedEventArgs e) { Result = new MyObject() { Title = txtTitle.Text }; if (rdBoolSettings.IsChecked == true) Result.Settings = new MyBoolSettings() { BoolSetting = chBool.IsChecked == true }; if (rdStringSettings.IsChecked == true) Result.Settings = new MyStringSettings() { StringSetting = txtString.Text }; DialogResult = true; } private void Cancel_click(object sender, RoutedEventArgs e) { DialogResult = false; } } } </code></pre> <p><strong>ExternalCode:</strong></p> <pre><code>var f = new EditMyObjectDialog(myObject); if (f.ShowDialog() == true) myObject = f.Result; </code></pre> <p>I belive there is much better design pattern that uses data binding etc. So basically I have two questions. </p> <ol> <li>How to make data binding not to modify object until user hits 'OK'? </li> <li>How to correctly handle 'Settings' property? What to do when user switches setting's type?</li> </ol>
 

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