detecting left shift and left ctrl alone

[chriscamacho]

can't find in self.wnd.keys a code for just these keys on their own

    def key_event(self, key, action, modifiers):
        self.leftSft = False
        self.leftCtr = False
        if action == self.wnd.keys.ACTION_PRESS:
            if key == self.wnd.keys.SPACE:
                # reset all to never dragged
                for s in self.sprites:
                    s.offsetx = 0
                    s.offsety = 0

            # no define for this modifiers = false, false, false
            SHIFT_ONLY = 65505
            CTRL_ONLY = 65507

            if key == SHIFT_ONLY:
                self.leftSft = True
            if key == CTRL_ONLY:
                self.leftCtr = True

I'm concerned if some other backend is in use then these magic numbers will not hold...

[einarf]

As far as I remember the modifiers are all bit fields. You can use bitwise operators to do checks like this.

[chriscamacho]

No only if another key is down, at least with pyglet and Linux

On Wednesday 21 February 2024, Einar Forselv @.***> wrote:

As far as I remember the modifiers are all bit fields. You can use bitwise operators to do checks like this.

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[implr]

I ran into this problem too.

The magic number you're seeing comes from pyglet's keys.py: https://github.com/pyglet/pyglet/blob/master/pyglet/window/key.py#L297 \ The constants in wnd.keys come from moderngl_window/context/pyglet/keys.py in that case, which doesn't forward shift as a standalone key from pyglet's key module.

It'd be fairly straightforward to add that (and I think I'll send a PR soon), but the the issue is that we'd have to do it for all platforms.