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Re: The Mysterious checkbox [message #55567 is a reply to message #55562]

Sun, 22 November 2020 09:07

Oblivion
Messages: 1094
Registered: August 2007

Senior Contributor

Hello steveo,

Quote:

To me a check box is a box that holds one of 2 states, either checked or not checked. It is useful to be able to respond to changes in check box state. I have spent the last hour looking over the 100 or so methods which seem to be associated with the check box and for the life of me I can't figure out how to call a method on that control which will tell me the state "checked or not checked".

Any ideas?

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

struct MyAppWindow : TopWindow {
	Option option;
	MyAppWindow()
	{
		Sizeable().Zoomable().CenterScreen().SetRect(0,0, 640, 480);
		Add(option.SetLabel("Option").LeftPosZ(20).TopPosZ(20));
		option << [=] { Title(Format("Option (checbox) state: %", ~option)); };

		// OR,
		// option.WhenAction = [=] { Title(Format("Option (checbox) state: %", ~option)); };
	};
};

GUI_APP_MAIN
{
	MyAppWindow().Run();
}

Almost all trivial ctrls (widgets) follow the same pattern. If they contain a Value you can access it via a tilde (~) operator,
Or via GetData and SetData methods. And they define a WhenAction callback which can be also set by an overloaded operator.

I suggest you check the Ctrl design concepts document:

https://www.ultimatepp.org/srcdoc$CtrlCore$CtrlDesignConcept s_en-us.html

Best regards,
Oblivion

Github page: https://github.com/ismail-yilmaz
upp-components: https://github.com/ismail-yilmaz/upp-components
Bobcat the terminal emulator: https://github.com/ismail-yilmaz/Bobcat

[Updated on: Sun, 22 November 2020 09:10]

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