PowerToys/src/modules/previewpane/README.md

# File Explorer

## End user facing:

[Please visit our overview](https://aka.ms/PowerToysOverview_FileExplorerAddOns)

## Developing

We have already done most of the development work in the [PreviewHandlerCommon](./common/cominterop/IPreviewHandler.cs) common project. To add a preview for the file type of .xyz:

-  Add a new .NET project in the preview pane folder.
-  Add a reference to the `PreviewHandlerCommon` common project.
-  Create your preview handler class and extend the FileBasedPreviewHandler class. See an example below:

```csharp
using System;
using System.Runtime.InteropServices;
using Common;

namespace XYZPreviewHandler
{
    /// <summary>
    /// Implementation of preview handler for .xyz files.
    /// GUID = CLSID / CLASS ID.
    /// </summary>
    [Guid("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx")]
    [ClassInterface(ClassInterfaceType.None)]
    [ComVisible(true)]
    public class XYZPreviewHandler : FileBasedPreviewHandler
    {
        private XYZPreviewHandlerControl xyzPreviewHandlerControl;

        /// Call your rendering method here.
        public override void DoPreview()
        {
            this.xyzPreviewHandlerControl.DoPreview(this.FilePath);
        }

        protected override IPreviewHandlerControl CreatePreviewHandlerControl()
        {
            this.xyzPreviewHandlerControl = new xyzPreviewHandlerControl();
            return this.xyzPreviewHandlerControl;
        }
    }
}
```

Create a separate Preview Handler Control class and extend the `FormHandlerControl` Class.

```csharp
using Common;

namespace XYZPreviewHandler
{
    public class XYZPreviewHandlerControl : FormHandlerControl
    {
        public XYZPreviewHandlerControl()
        {
            // ... do your initializations here.
        }

        public override void DoPreview<T>(T dataSource)
        {
            // ... add your preview rendering code here.
        }
    }
}
```

#### Integrate the Preview Handler into PowerToys Settings:

Navigate to the [powerpreview](../previewpane/powerpreview/powerpreview.h) project and edit the `powerpreview.h` file. Add the following Settings Object instance to `m_previewHandlers` settings objects array in the constructor initialization:

```cpp
// XYZ Preview Handler Settings Object.
FileExplorerPreviewSettings(
    false,
    L"<--YOUR_TOGGLE_CONTROL_ID-->",
    L"<--A description of your preview handler-->",
    L"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx", // your preview handler CLSID.
    L"<--A display name for your preview handler-->") 
```

## Installation

### MSI

To add a new Previewer update the `Product.wxs` file in `PowerToysSetup` similar to existing Previewer to register the Preview Handler. More details about registration of Preview Handlers can be [found here.](https://docs.microsoft.com/en-us/windows/win32/shell/how-to-register-a-preview-handler)

```xml
<Component Id="Module_PowerPreview" Guid="FF1700D5-1B07-4E07-9A62-4D206645EEA9" Win64="yes">
        <!-- Files to include dll's for new Previewer and it's dependencies -->
        <File Source="$(var.BinX64Dir)\modules\XYZPreviewer.dll" />
        <File Source="$(var.BinX64Dir)\modules\Dependency.dll" />
      </Component>
      <Component Id="Module_PowerPreview_PerUserRegistry" Guid="CD90ADC0-7CD5-4A62-B0AF-23545C1E6DD3" Win64="yes">
        <!-- Added a separate component for Per-User registry changes -->
        <!-- Registry Key for Class Registration of new Preview Handler -->
        <RegistryKey Root="HKCU" Key="Software\Classes\CLSID\{ddee2b8a-6807-48a6-bb20-2338174ff779}">
          <RegistryValue Type="string" Value="XYZPreviewHandler.XYZPreviewHandler" />
          <RegistryValue Type="string" Name="DisplayName" Value="XYZ Preview Handler" />
          <RegistryValue Type="string" Name="AppID" Value="{CF142243-F059-45AF-8842-DBBE9783DB14}" />
          <RegistryValue Type="string" Key="Implemented Categories\{62C8FE65-4EBB-45e7-B440-6E39B2CDBF29}" Value=""/>
          <RegistryValue Type="string" Key="InprocServer32" Value="mscoree.dll" />
          <RegistryValue Type="string" Key="InprocServer32" Name="Assembly" Value="SvgPreviewHandler, Version=$(var.Version).0, Culture=neutral" />
          <RegistryValue Type="string" Key="InprocServer32" Name="Class" Value="XYZPreviewHandler.XYZPreviewHandler" />
          <RegistryValue Type="string" Key="InprocServer32" Name="RuntimeVersion" Value="v4.0.30319" />
          <RegistryValue Type="string" Key="InprocServer32" Name="ThreadingModel" Value="Both" />
          <RegistryValue Type="string" Key="InprocServer32" Name="CodeBase" Value="file:///[ModulesInstallFolder]XYZPreviewHandler.dll" />
          <RegistryValue Type="string" Key="InprocServer32\$(var.Version).0" Name="Assembly" Value="XYZPreviewHandler, Version=$(var.Version).0, Culture=neutral" />
          <RegistryValue Type="string" Key="InprocServer32\$(var.Version).0" Name="Class" Value="XYZPreviewHandler.XYZPreviewHandler" />
          <RegistryValue Type="string" Key="InprocServer32\$(var.Version).0" Name="RuntimeVersion" Value="v4.0.30319" />
          <RegistryValue Type="string" Key="InprocServer32\$(var.Version).0" Name="CodeBase" Value="file:///[ModulesInstallFolder]XYZPreviewer.dll" />
        </RegistryKey>
        <!-- Add new previewer to preview handlers list -->
        <RegistryKey Root="HKCU" Key="Software\Microsoft\Windows\CurrentVersion\PreviewHandlers">
          <RegistryValue Type="string" Name="{Clsid-Guid}" Value="Name of the Previewer" />
        </RegistryKey>
        <!-- Add file type association for the new Previewer -->
        <RegistryKey Root="HKCU" Key="Software\Classes\.xyz\shellex">
          <RegistryValue Type="string" Key="{8895b1c6-b41f-4c1c-a562-0d564250836f}" Value="{Clsid-Guid}" />
        </RegistryKey>
      </Component>
```

## Managing Preview Handlers

After successful integration, your preview handler should appear in the PowerToys settings UI under the `File Explorer Preview` Tab. In here you should be able to enable and disable your preview handler.

<img src="../../../doc/images/preview_pane/settings-ui.png" alt="Settings UI - File Explorer Preview Tab" >

In the general settings of the Settings UI, you should be able to disable and enable all the preview handlers all at once.

<img src="../../../doc/images/preview_pane/general-settings.png" alt="Settings UI - General Settings Tab" >