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Re:






On Wed, Feb 20, 2019 at 11:10 AM Igor Korot <ikorot01@xxxxxxxxx> wrote:
Hi, Paul,

On Wed, Feb 20, 2019 at 12:03 PM Paul Davis <paul@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
>
>
> On Wed, Feb 20, 2019 at 10:49 AM Igor Korot via gtk-list <gtk-list@xxxxxxxxx> wrote:
>>
>>
>> Why do we even talking about button number, when the doc explicitly said
>> "right-click", which implies "right mouse button".
>
>
> X Window (at the very least) allows buttons to be remapped. Button #1 is typically the left mouse button, but a user may remap them (eg. left-handed people with a strong preference for using the mouse in their left hand). "left" and "right" buttons normally have a semantic meaning (e.g. "the button normally used for clicking on things" vs "the button used for context menus etc.") and you cannot hard code these on X Window.  More precisely, if you do hard code them, you disenfranchise a set of users who remap their mouse buttons.

Are you saying that if I map the left mouse button to be the right one
and click on it, I will not get that signal?

As far as the user code is concerned, the button I press to get the
context menu shouldn't matter, because this a low-level signal.
All the user code should be aware is - did I click the action button
or context menu one. Why do I need to care which is which?

Could you give me a scenario?

hold the mouse in your right hand. put your index finger on the most naturally positioned button. press it.

by default, X Window will generate a mouse button event using button number one.

now put the mouse in your left hand, put that index finger on the most naturally positioned button, press it.

by default, X Window will generate a mouse button event using button number three.

programmers don't want to deal with this in their code, so they generally assume that button #1 is "left button" and button #3 is "right button".

but what they really mean is "button used for most button clicks" and "button used for context clicks"

a dedicated left-handed user may remap this so that their left index finger correctly generates button 1 - the button used for most clicks.

your code can assume that 1 => most clicks; 3 => context click

it cannot assume that 1 => left ; 3 => right


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