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https://github.com/microsoft/PowerToys
synced 2025-08-22 01:58:04 +00:00
6acb793184
What the title says. 😄
Rather than relying on the potentially overloaded `!=` or `==` operators
when checking for null, now we'll use the `is` expression (possibly
combined with the `not` operator) to ensure correct checking. Probably
overkill for many of these classes, but decided to err on the side of
consistency. Would matter more on classes that may be inherited or
extended.
Using `is` and `is not` will provide us a guarantee that no
user-overloaded equality operators (`==`/`!=`) is invoked when a
`expression is null` is evaluated.
In code form, changed all instances of:
```c#
something != null
something == null
```
to:
```c#
something is not null
something is null
```
The one exception was checking null on a `KeyChord`. `KeyChord` is a
struct which is never null so VS will raise an error when trying this
versus just providing a warning when using `keyChord != null`. In
reality, we shouldn't do this check because it can't ever be null. In
the case of a `KeyChord` it **would** be a `KeyChord` equivalent to:
```c#
KeyChord keyChord = new ()
{
Modifiers = 0,
Vkey = 0,
ScanCode = 0
};
```
96 lines
2.5 KiB
C#
96 lines
2.5 KiB
C#
// Copyright (c) Microsoft Corporation
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// The Microsoft Corporation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using Microsoft.CmdPal.Core.ViewModels.Models;
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using Microsoft.CommandPalette.Extensions;
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namespace Microsoft.CmdPal.Core.ViewModels;
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public partial class StatusMessageViewModel : ExtensionObjectViewModel
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{
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public ExtensionObject<IStatusMessage> Model { get; }
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public string Message { get; private set; } = string.Empty;
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public MessageState State { get; private set; } = MessageState.Info;
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public ProgressViewModel? Progress { get; private set; }
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public bool HasProgress => Progress is not null;
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public StatusMessageViewModel(IStatusMessage message, WeakReference<IPageContext> context)
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: base(context)
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{
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Model = new(message);
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}
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public override void InitializeProperties()
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{
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var model = Model.Unsafe;
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if (model is null)
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{
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return; // throw?
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}
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Message = model.Message;
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State = model.State;
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var modelProgress = model.Progress;
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if (modelProgress is not null)
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{
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Progress = new(modelProgress, this.PageContext);
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Progress.InitializeProperties();
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UpdateProperty(nameof(HasProgress));
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}
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model.PropChanged += Model_PropChanged;
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}
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private void Model_PropChanged(object sender, IPropChangedEventArgs args)
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{
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try
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{
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FetchProperty(args.PropertyName);
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}
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catch (Exception ex)
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{
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ShowException(ex);
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}
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}
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protected virtual void FetchProperty(string propertyName)
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{
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var model = this.Model.Unsafe;
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if (model is null)
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{
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return; // throw?
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}
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switch (propertyName)
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{
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case nameof(Message):
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this.Message = model.Message;
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break;
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case nameof(State):
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this.State = model.State;
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break;
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case nameof(Progress):
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var modelProgress = model.Progress;
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if (modelProgress is not null)
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{
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Progress = new(modelProgress, this.PageContext);
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Progress.InitializeProperties();
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}
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else
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{
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Progress = null;
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}
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UpdateProperty(nameof(HasProgress));
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break;
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}
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UpdateProperty(propertyName);
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}
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}
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