No way to click menu/middle button? (+workaround)

[gingerbeardman]

My two-button Mac mouse operates as RISC OS Select (Left) and Adjust (Right) by default.

I can switch to two-button mouse mode (which swaps Menu and Adjust) in order to be able to use RISC OS Menu button (as my right click).

But I cannot seem to use all three buttons at once?

rpcemu-macos/src/iomd.c

Lines 831 to 867 in ad6b841

	iomd_mouse_buttons_read(void)
	{
	uint32_t temp = 0;
	int mouse_buttons = mouse_buttons_get();
	/* Left */
	if (mouse_buttons & 1) {
	temp |= 0x40; // bit 6
	}
	/* Middle */
	if (mouse_buttons & 4) {
	if (config.mousetwobutton) {
	temp |= 0x10; // bit 4
	} else {
	temp |= 0x20; // bit 5
	}
	}
	/* Right */
	if (mouse_buttons & 2) {
	if (config.mousetwobutton) {
	temp |= 0x20; // bit 5
	} else {
	temp |= 0x10; // bit 4
	}
	}
	/* bit 0 contains the monitor id bit, 0 for VGA, 1 for TV type monitors.
	As we will probably always need VGA, leave as 0 */
	/* bit 8 is used to detect to presence of 16 bit sound, if written high
	and read back low it's 16 bit, due to weak pullup resistor, always
	return 0 to indicate bit */
	/* Invert the button values */
	return temp ^ 0x70; // bit 4 5 and 6
	}

It would be great if Alt+Click, or some other modifier, could enable use of all three mouse buttons at once on macOS?

My workaround is to temporarily use a third-arty app, MagicPrefs or MiddleClick, to give me native Middle click on macOS (as three finger press on Magic Mouse) which is picked up by RPCEmu.

[Septercius]

This could be done quite easily - I bodged the code so it uses the "CMD" key as the middle menu button and it seems to work fine. I chose that so it won't interfere with any RISC OS applications that look for SHIFT/CTRL/ALT with mouse clicks. If this sounds good, I'll see if I can create a quick patch at some point, which will also remove the Menu/Adjust swap.

[gingerbeardman]

Sounds good, thank you.

[Septercius]

I can think of two ways for this to work:

1. CMD acts as the Menu mouse button, independent of the other buttons.
2. CMD + left mouse button acts as the Menu mouse button.

I personally prefer the first, as it means you can still press SELECT and MENU together. However as I don't personally have any need for two button mode, I thought I'd ask for feedback before making any code changes.

[gingerbeardman]

1. Seems more Mac-like, and I'd have discovered that method had the app been that way.
2. Seems to cater for possible RISC OS use. But I'm not an experienced RISC OS user, so I'll go with your opinion.

My only reference is the Koi-Koi game (it's on the !Store) that I'm currently playing: it uses SELECT and ADJUST during play and MENU after each game (to start a new game). Not really an exhaustive use case.

[gingerbeardman]

Could the three-finger tap workaround that requires external apps be integrated into the RPCEmu?

[Septercius]

I'd rather not implement hardware-specific functionality, to be honest.

[myelin]

Confirmed that Cmd functions as a menu-click in https://github.com/myelin/rpcemu-macos/releases/tag/0.9.1-pp3 in two-button mouse mode. Thanks!