# Events

The **Events** tab lets you configure functions for file types that are initiated by various mouse events - double-click and drag and drop events. For example, you can configure Opus to run a different program for files when they're double-clicked and the **Shift** key is held down, or when they're double-clicked with the middle mouse button (if you have one). It's also possible to use this system to have different double-click behavior to Explorer - so that double-clicking a file in Opus can behave quite differently to double-clicking it in Explorer.

![](https://3597805814-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3XSZSwWow0fDf6fQJobd%2Fuploads%2Fgit-blob-8c0fa2a3754b2854939f218bc75c0f720b671cf6%2Ffiletypes_-_events.png?alt=media)

The above screenshot shows an example of some events that have been configured for the **Images** [file type group](https://chaoses-ib.gitbook.io/directory-opus/manual/file_types/file_type_groups). The events that you can configure are:

* **Drag-and-drop**: What happens when you drag and drop a file to another folder.
* **Left double-click**: What happens when you double-click a file with the left mouse button.
* **Middle double-click**: What happens when you double-click a file with the middle mouse button.

These three events can also be configured separately depending on whether the **Alt**, **Ctrl** or **Shift** keys are held down. There are no right button double-click events as the right button is used for [Context Menus](https://chaoses-ib.gitbook.io/directory-opus/manual/file_types/filetype_editor/context_menu). You can also add items to the drag and drop context menu (the menu displayed when you drag a file with the right mouse button) on the [Drop Menu](https://chaoses-ib.gitbook.io/directory-opus/manual/file_types/filetype_editor/drop_menu) tab.

Whenever one of the above events occurs, Opus searches your configured file types looking for a configured action. File types are searched in the following order:

1. The specific file type for that file (e.g. for a **.jpg** file this might be the **JPEG Image** file type)
2. The file type group that contains that file extension (e.g. **Images**)
3. The **Recognized images** file type if the file is a recognized image file
4. The **All files** file type (or for a folder, **All folders**)
5. The **All files and folders** file type.

The first, most specific, file type found that has a function defined for that event is the one used.

To edit the event for a file type, select the event from the list and click the **Edit** button at the bottom of the page (or double-click the event in the list). The event editor is a variant of the standard command editor, so please see the [Command Editor](https://chaoses-ib.gitbook.io/directory-opus/manual/customize/creating_your_own_buttons/command_editor) page for instructions on how to define a command.

You can also right-click on the items in the events list to display a context menu for the event. This context menu lets you use **Copy** and **Paste** to copy the definition from one event to another.

The events system can be very useful; with a bit of careful thought and configuration it's possibly to really streamline your workflow. To take the above screenshot as an example, four events have been configured for the **Images** group (meaning they will act on any file type added to that group).

1. ![](https://github.com/Chaoses-Ib/DirectoryOpus/blob/main/anchor/convertpng)The **Drag-and-drop + Ctrl** event has been configured to convert images to PNG format when you hold the **Ctrl** key and drop them in a folder.

![](https://3597805814-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3XSZSwWow0fDf6fQJobd%2Fuploads%2Fgit-blob-d1d4fde6354c9346b0b09ec3c26a3326aba01196%2Fevent_-_dropctrl.png?alt=media)

The function used for this is **Image CONVERT=png**. This invokes the [Image Conversion](https://chaoses-ib.gitbook.io/directory-opus/manual/additional_functionality/image_conversion) function and specifies an output format of PNG. Because the output format has been specified on the command line, the image conversion dialog will not appear - instead the dropped file will be immediately saved to the target folder in PNG format.

1. The **Left double-click** event has been configured to open the file in the internal Opus viewer when the file is double-clicked.

![](https://3597805814-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3XSZSwWow0fDf6fQJobd%2Fuploads%2Fgit-blob-90b1f6fbbfd9ee4bf81e33063dba7b587ff0b4e1%2Fevent_-_dblclk.png?alt=media)

This event calls the internal [**Show**](https://chaoses-ib.gitbook.io/directory-opus/manual/reference/command_reference/internal_commands/show) command to view the image using the [standalone image viewer](https://chaoses-ib.gitbook.io/directory-opus/manual/additional_functionality/viewing_images). This lets you double-click images in Opus to preview them quickly in its own viewer, but doesn't have any effect on what happens when you double-click an image file outside of Opus.

1. The **Left double-click + Ctrl** event has been configured to open the file in Photoshop when the file is double-clicked and the **Ctrl** key is held down.

![](https://3597805814-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3XSZSwWow0fDf6fQJobd%2Fuploads%2Fgit-blob-708afbd8011c7b511fed14097950c1ffbd8613dc%2Fevent_-_dblclkctrl.png?alt=media)

This event runs the external function **"C:\Program Files\Adobe\Adobe Photoshop CS5 (64 Bit)\Photoshop.exe" %1** to open the file in Photoshop. The **%1** [control code](https://chaoses-ib.gitbook.io/directory-opus/manual/customize/creating_your_own_buttons/passing_files_to_external_programs) is used to pass the filename to **Photoshop.exe**.

1. Finally, the **Middle double-click** event has been configured to open the file in the standard Windows image viewer when the file is double-clicked with the middle mouse button.

![](https://3597805814-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3XSZSwWow0fDf6fQJobd%2Fuploads%2Fgit-blob-ecccd367de1ab2744a71b08ce9c71793ca5c356e%2Fevent_-_middleclk.png?alt=media)

This events runs the external function **C:\Windows\System32\rundll32.exe "C:\Program Files\Windows Photo Viewer\PhotoViewer.dll", ImageView\_Fullscreen %1** which invokes the Windows photo viewer. The name of the file is passed to the application using the **%1**[control code](https://chaoses-ib.gitbook.io/directory-opus/manual/customize/creating_your_own_buttons/passing_files_to_external_programs).

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