Allow customization of mouse shortcuts

[Tyriar]

Some users would like to be able to customize not just pure keyboard shortcuts but also mouse + modifier ones. These are currently hard coded, for example alt+click to add a selection.

See #3091 for some more context.

[aegyed91]

+1

I would like to do shift+cmd+leftMouseButton for Peek Definition, would be a perfect combination for me.

[jtremback]

+1

[ironcladlou]

I've found an interesting performance implication resulting from the current defaults/lack of configurability. Consider the hard-coded modifier associated with the "peek definition" functionality. If a plugin must do some work to provide the definition, it's very likely VSCode will ask plugins for definition information even when the user has no intention of obtaining it. As I describe in microsoft/vscode-go#257 (comment):

For example, with the cursor resting still in the editor area, pressing ⌘ instantly invokes the GoDefinitionProvider, even when ⌘ is immediately used in a chord for some other command (e.g. copy, paste, opening the command palette, etc.).

This means calls to godef are happening when the user is pressing a very common key with no intention of obtaining contextual hover information.

When using vscode-go, this means significant extraneous energy usage which could be avoided almost entirely by providing modifier key settings for "peek definition". Not only would the feature be convenient and allow for better host OS GUI integration, but VSCode would be more CPU-efficient for common usages.

[davidpmccormick]

+1 – Atom, Sublime and jsbin.com (presumably others, too) all allow creation of multiple cursors with ⌘+click (on a Mac, at least). It'd be good to be forced to learn as few new shortcuts as possible when switching to a new editor.

[Tyriar]

I'm just completely avoiding using alt+click to add cursors until I can customize to make Windows and Linux consistent. Don't want to build muscle memory when it's going to change later.

@alexandrudima any thoughts on when you could get to this? It's blocking adding cursors via mouse on Linux. I can take a shot at it if you give a high level approach.

[JulieMarie]

+1 I just discovered VS Code and I'm loving it, but as a long time Sublime Text user on Linux, I'm missing the ctrl + click ability. Would love to be able to customize mouse shortcuts.

[Tyriar]

From @ChristopherHaws in #6853

• VSCode Version: 1.1.1
• OS Version: Windows 10 Pro

In Visual Studio (full version), I tend to turn off the Ctrl+LeftMouseClick go to definition feature. I personally prefer to have Ctrl+LeftMouseClick select the entire word under my mouse cursor.

From what I can see, mouse events are not configurable at the moment, and they are also not possible to override with extensions (to the best of my knowledge). It would be really nice to have a mouse mapping configuration file. Sublime Text has this (although it is sort of a hidden feature that is not exposed through the UI). Just as an example, my sublime text mousemap file looks like this:

[
    {
        "button": "button1", "count": 1, "modifiers": ["ctrl"],
        "press_command": "drag_select",
        "press_args": {"by": "words"}
    }
]