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Touchscreen and buttons [message #48605]

Tue, 08 August 2017 12:10

Giorgio
Messages: 218
Registered: August 2015

Experienced Member

Hi there,
I am experimenting with a touch screen on a raspberry. I developed the application on Windows, but it compiled on raspbian with almost no additional effort - just to fix less than 20 lines of code - and I think that is quite remarkable.

The original application was meant to be used with mouse and keyboard, so I have to tune the User Interface to make the application usable: first problem I encountered is with buttons.

If I use a "custom" button (i.e. a button created by me and to which I assigned a function with btn.WhenPush = THISBACK(myFunction); ) the button works as expected. If I use "built-in" buttons (i.e. the button ok and cancel of a CtrlLayoutOKCancel window) they do not work: when I press them on the touch screen, I see that they are pressed and released, but nothing happens. Someone else encountered this problem?

As a workaround, I tried to assign the method Close() to the ok and cancel buttons, but - due to my newbie-ity - I did not figure out how to do that; this is the original code, working without a problem with keyboard and mouse:

#include "ListOp.h"

ListOp::ListOp(MLav _macrolav)
{
	CtrlLayoutOKCancel(*this, t_("Select operator"));
	std::vector<S_OPERATORS> mylist = db_data.FindOperators(_macrolav);
	for (size_t i=0; i<mylist.size(); i++)
		SwOperators.Set((int)i, mylist[i].ID, mylist[i].NAME);
	ok.Ok();
	cancel.Cancel();
}

I tried adding the following:

	[...]

	ok.Ok();
	ok.WhenPush = THISBACK(this.Close);
	cancel.Cancel();
	cancel.WhenPush = THISBACK(this.Close);

...and this:

	[...]

	ok.Ok();
	ok.WhenPush = THISBACK(this->Close);
	cancel.Cancel();
	cancel.WhenPush = THISBACK(this->Close);

...but the code does not compile.

Any suggestion is appreciated.
Regards,
Gio

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