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Push button by keystroke (without ALT) [message #29920]

Tue, 30 November 2010 09:49

zeiler
Messages: 2
Registered: November 2010

Junior Member

Hello,

I'm new to the forum (and the UPP-Framework). I really like both Smile

Nice work, the people are friendly, the answers helpful. I already searched the forum for my problem but didn't find the exact problem I have. Now here's my problem: I need the ability to push a button or executing the corresponding button callback when a key is pressed (without the ALT key).

My current solution is to derive a class from Upp::Button calling it MyButton and adding a function to that class which returns the protected Button-variable accesskey. Then I overwrite the main Windows Key()-function and add call button.PseudoPush when the access key is pressed.

Well, maybe I'll better show you the code:
In the header file I have the following:

class MyButton : public Button {
public:
	dword GetAccessKey();
};

dword MyButton::GetAccessKey()
{
	return ToLower((wchar)accesskey);
}

In the main Windows class declaration I add the button:

MyButton button;

In the main Windows constructor:

button.SetLabel("E&xit");

And finally in the overwritten Key()-function of the main Window:

bool MyMainWindow::Key(dword key, int count)
{
	if ( button.GetAccessKey() == key )
	{
		button.PseudoPush();
		return true;
	}
	return TopWindow::Key(key, count);
}

Now here's my question:
Is there a better, cleaner, more elegant solution to this problem?

Best regards,
Julian

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Re: Push button by keystroke (without ALT) [message #29923 is a reply to message #29920]

Tue, 30 November 2010 11:31

dolik.rce
Messages: 1789
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

Hi Julian,
welcome here Wink

You can trigger the button action from a Key() handler of your application. Have a look at its description in Ctrl reference.

A simple example would be:

#include <CtrlLib/CtrlLib.h>
using namespace Upp;

class Win: public TopWindow{
	typedef Win CLASSNAME;
public:
	Button b;
	Win(){
		Add(b.HCenterPos().VCenterPos());
		b.SetLabel("Close");
		b<<=THISBACK(OnPush);
	}
	void OnPush(){
		Exclamation("Button pushed, exiting...");
		Close();
	}
	bool Key(dword key,int){
		if(key=='q'){
			b.Action();
			return true;
		}
		return false;
	}
};

GUI_APP_MAIN{
	Win().Run();
}

Another possible solution could use InstallKeyHook() which works for entire app, not only one window. It is documented in the same document.

Best regards,
Honza

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Re: Push button by keystroke (without ALT) [message #29924 is a reply to message #29923]

Tue, 30 November 2010 11:47

koldo
Messages: 3356
Registered: August 2008

Senior Veteran

Or this?

class MyButton : public Button {
private:
	virtual void LeftDown(Point p, dword key) {
		Button::LeftDown(p, key);		
		if (key & K_ALT)
			PromptOK("Done");	
	}
};

Best regards
Iñaki

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