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Steamless/Steamless.API/Model/ViewModelBase.cs

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C#

/**
* Steamless - Copyright (c) 2015 - 2024 atom0s [atom0s@live.com]
*
* This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
* To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/ or send a letter to
* Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
*
* By using Steamless, you agree to the above license and its terms.
*
* Attribution - You must give appropriate credit, provide a link to the license and indicate if changes were
* made. You must do so in any reasonable manner, but not in any way that suggests the licensor
* endorses you or your use.
*
* Non-Commercial - You may not use the material (Steamless) for commercial purposes.
*
* No-Derivatives - If you remix, transform, or build upon the material (Steamless), you may not distribute the
* modified material. You are, however, allowed to submit the modified works back to the original
* Steamless project in attempt to have it added to the original project.
*
* You may not apply legal terms or technological measures that legally restrict others
* from doing anything the license permits.
*
* No warranties are given.
*/
namespace Steamless.API.Model
{
using System;
using System.ComponentModel;
using System.Windows;
public abstract class ViewModelBase : NotifiableModel
{
/// <summary>
/// Default Constructor
/// </summary>
protected ViewModelBase()
{
this.Events = new EventHandlerList();
}
/// <summary>
/// Internal static design mode flag.
/// </summary>
private static bool? m_IsInDesignMode;
/// <summary>
/// Gets if this ViewModelBase is in design mode.
/// </summary>
public bool IsInDesignMode => IsInDesignModeStatic;
/// <summary>
/// Gets the static ViewModelBase design mode flag.
/// </summary>
public static bool IsInDesignModeStatic
{
get
{
if (m_IsInDesignMode.HasValue)
return m_IsInDesignMode.Value;
var isInDesignModeProperty = DesignerProperties.IsInDesignModeProperty;
m_IsInDesignMode = (bool)DependencyPropertyDescriptor.FromProperty(isInDesignModeProperty, typeof(FrameworkElement)).Metadata.DefaultValue;
return m_IsInDesignMode.Value;
}
}
/// <summary>
/// Gets or sets the internal event handler list.
/// </summary>
private EventHandlerList Events
{
get => this.Get<EventHandlerList>("Events");
set => this.Set("Events", value);
}
/// <summary>
/// Event to subscribe to to be notified when a view is navigated from.
/// </summary>
public event EventHandler<NavigatedEventArgs> NavigatedFrom
{
add => this.Events.AddHandler("NavigatedFromEvent", value);
remove => this.Events.RemoveHandler("NavigatedFromEvent", value);
}
/// <summary>
/// Event to subscribe to to be notified when a view is navigated to.
/// </summary>
public event EventHandler<NavigatedEventArgs> NavigatedTo
{
add => this.Events.AddHandler("NavigatedToEvent", value);
remove => this.Events.RemoveHandler("NavigatedToEvent", value);
}
/// <summary>
/// Internal navigated from event invoker.
/// </summary>
/// <param name="e"></param>
public void OnNavigatedFrom(NavigatedEventArgs e)
{
var eventHandler = (EventHandler<NavigatedEventArgs>)this.Events["NavigatedFromEvent"];
eventHandler?.Invoke(this, e);
}
/// <summary>
/// Internal navigated to event invoker.
/// </summary>
/// <param name="e"></param>
public void OnNavigatedTo(NavigatedEventArgs e)
{
var eventHandler = (EventHandler<NavigatedEventArgs>)this.Events["NavigatedToEvent"];
eventHandler?.Invoke(this, e);
}
}
}