Get caps lock state

[deranjer]

Been using fyne and wanted to get the current state of the caps lock key. It appears that this may have been added in glfw 3.3: glfw/glfw#946

Has this been added to this repo as well? See the fyne ticket here: fyne-io/fyne#1391

[pwaller]

From the issue you linked, the commit which closed it: glfw/glfw@0e8c4ea

See https://github.com/go-gl/glfw/search?q=GLFW_MOD_CAPS_LOCK

On the go side, it looks like:

glfw/v3.3/glfw/input.go

Line 254 in e5ec435

ModCapsLock ModifierKey = C.GLFW_MOD_CAPS_LOCK

Hopefully that's enough for you to run with?

[deranjer]

Per the fyne people that allows them to detect if the caps lock key is hit, but does not allow getting the current caps lock state.

[myavchik]

getKeyMods

glfw/v3.3/glfw/glfw/src/win32_window.c

Lines 429 to 447 in eb74977

	static int getKeyMods(void)
	{
	int mods = 0;
	if (GetKeyState(VK_SHIFT) & 0x8000)
	mods |= GLFW_MOD_SHIFT;
	if (GetKeyState(VK_CONTROL) & 0x8000)
	mods |= GLFW_MOD_CONTROL;
	if (GetKeyState(VK_MENU) & 0x8000)
	mods |= GLFW_MOD_ALT;
	if ((GetKeyState(VK_LWIN) | GetKeyState(VK_RWIN)) & 0x8000)
	mods |= GLFW_MOD_SUPER;
	if (GetKeyState(VK_CAPITAL) & 1)
	mods |= GLFW_MOD_CAPS_LOCK;
	if (GetKeyState(VK_NUMLOCK) & 1)
	mods |= GLFW_MOD_NUM_LOCK;
	return mods;
	}

[pwaller]

@myavchik that appears to be an implementation detail on win32 -- and doesn't amount to giving you the ability to test the key state for yourself with a glfw API. https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getkeystate

I didn't find evidence that this is in upstream. Is it? If it is, please link to it, and patches are welcome to implement the downstream bit. For now, marking external.