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Re: [XForms] Single and double-click

From: Alessandro Basili
Subject: Re: [XForms] Single and double-click
Date: Mon, 6 Feb 2012 09:10:48 +0000

Jens Thoms Toerring writes:

of the four browser types react to single mouse clicks with the
left mouse button, none of them to double clicks per default. If
you don't want a reaction to single but only double clicks I guess
that using a FL_NORMAL_BROWSER (which doesn't react to single
clicks) and installing a callback for double clicks, using the
fl_set_browser_dblclick_callback() function, should do the trick.

We normally use a FL_HOLD_BROWSER type of browser in order to highlight the single mouse action of the user and then a dblclick_callback to perform the action we want. We found that an intermediate step would help focusing user attention and helped him effectively use the browser.

IMHO the action should be clear depending on the layout of the GUI. If it's a directory search browser the user would expect that the action would be 'opening' a file or a directory. Giving cues about what's next will enable the user to use effectively the object and since the user may not know if he needs a single click or a double, having a visual feedback on a single click may help the user.

At least that's how it should work according to my current un-
derstanding of the documentation and the code but I did not do
any tests yet.

We are extensively using browsers but unfortunately we are still using version 1.0 Released on december 8, 2002! Plus a couple of minor modifications which do affected browser behavior. I do not know if browser behavior has changed since that release, but I believe that the main principles behind still do apply.

clicks you didn't program in yourself. If you want e.g. a line
to be highlighted in some way on a double click you will have
to take care of that yourself (since it's imposible to forsee
what people expect to happen on a double click into a browser).

Using the FL_HOLD_BROWSER you'll get highlighting automatically, but you still need a dblclick_callback to react on double clicks.

What I noticed is not effectively working is the reaction to wheel inputs when there's a slide vertical bar. It seems the reaction is not as smooth as one would expect but I must say I haven't spent a whole lot of time on that.


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