long or short click

[Serg_pr]

How to trace a short or long press on the button widget?

(use touchscreen).

[Joel Bodenmann]

Hello Serge,

Although the GINPUT module provides the necessary infrastructure to detect short and long clicks (GMETA_MOUSE_CLICK and GMETA_MOUSE_CTXCLICK), these information aren't being forwarded to the GWIN module. Each widget interprets the mouse actions separately as it turned out that meta information such as click and long-click have very little semantic use on the widget level.
Widgets receive mouse down, mouse up and mouse move events. There's no "click type" or other meta information inside the GWIN module.

There are two possible things that you can do:

1. Manually hook up a listener to the mouse that receives and processes the click and longlick events provided by the GINPUT module. Then you'll have to map those to the button widget events. That's a very cumbersome solution and not the recommended way of doing this.
2. Create a custom button widget that sends the click type information via the event structure. This is the recommended way of doing this. You can copy-paste the existing button widget (the files /src/gwin/gwin_button.c and /src/gwin/gwin_button.h) and start a GTIMER in the mouseDown() function of the widget and stop it in the mouseUp() function. If the timer fires within that time you know that a long-click happened, otherwise it was a short-click. You can then add that information to the event structure that is sent to the connected listeners.

We strongly recommend following the proposed solution 2. It's the proper way of doing this and it fits the uGFX philosophy and won't cause any problems when updating to future versions.
There's an article that talks about custom widgets, we strongly recommend giving it a read: http://wiki.ugfx.org/index.php/Creating_a_widget

Please don't hesitate to ask if you have any questions. We are happy to help whereever we can.

[Serg_pr]

Thanks for the advice.
I will do according to the method 2.

[Joel Bodenmann]

That's the right decision
Let us know if you have any questions.