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* created a folder for settings and added an overview, hotkey information * basic structure for communication between settings and runner * Added information about the IPC communication between settings and runner * Added information about the communication between the settings process and modules * Added details on backward compatibility * brief overview on settings utils * added an overview of the viewmodels and anomalies * minor modifications * Settings v2 dev docs (#7334) * Added settings architecture and tech stack dev docs * Added telemetry and updated architecture docs for settings v2 * Fix image link in ui_architecture markdown * Added table of contents for settings v2 * Correct file path for ui architecture image * nit fix in table of contents heading * Add doc for xaml island tweaks Co-authored-by: Divyansh Srivastava <somm14divi@gmail.com>
47 lines
2.6 KiB
Markdown
47 lines
2.6 KiB
Markdown
# Inter-Process Communication with Runner
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The Settings v2 process uses two way IPC to communicate with the runner process.
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## Initialization
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- On the settings' side, the two way IPC delegates are contained with the [`ShellPage.xaml.cs`](/src/core/Microsoft.PowerToys.Settings.UI/Views/ShellPage.xaml.cs) file. The delegates are static and the views for all the powerToys send the ipc information to the viewmodels as `ShellPage.DefaultSndMSGCallBack`.
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- These delegates are initialized within the [`Mainwindow.xaml.cs`](/src/core/Microsoft.PowerToys.Settings.UI.Runner/MainWindow.xaml.cs) file in the `Settings.Runner` project.
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## Types of IPC delegates
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- There are three types of delegates for the settings to communicate with the runner:
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1. `SendDefaultMessage` - This is used by all the viewmodels to communicate changes in the UI to the runner so that the information can be dispatched to the modules.
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2. `RestartAsAdmin`
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3. `CheckForUpdates`
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## Sending information to runner
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- The settings process communicates with the runner by using the delegates defined within the [`ShellPage.xaml.cs`](/src/core/Microsoft.PowerToys.Settings.UI/Views/ShellPage.xaml.cs) file.
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- Depending on the type of object sending the information, the json is created accordingly.
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- If any information has been modified by the user in the GeneralSettings page, then the json file sent to the runner has the name set to `general`, whereas if any information has been modified by the user in any powertoy related settings page, the name of the json file being communicated with the runner is set to `powertoy`.
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## Receiving information from runner
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- The `ShellPage`object has a `IPCResponseHandleList` which is a list of functions which handle IPC responses.
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```csharp
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// receive IPC Message
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Program.IPCMessageReceivedCallback = (string msg) =>
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{
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if (ShellPage.ShellHandler.IPCResponseHandleList != null)
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{
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try
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{
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JsonObject json = JsonObject.Parse(msg);
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foreach (Action<JsonObject> handle in ShellPage.ShellHandler.IPCResponseHandleList)
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{
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handle(json);
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}
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}
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catch (Exception)
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{
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}
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}
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};
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```
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- Whenever any information is sent from the runner each of the functions in the handle list perform their action on that json object.
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- One example of where information sent from the runner is being processed by the settings is in [`GeneralPage.xaml.cs`](/src/core/Microsoft.PowerToys.Settings.UI/Views/GeneralPage.xaml.cs) when the user clicks the check for updates button. The information displayed after, such as the user has the latest version installed is a result of this handle.
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