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  Own buttons with events - is this ok?  (Read 678 times)
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Offline dime26

Senior Devvie


Medals: 2
Projects: 3
Exp: 5 years


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« Posted 2014-02-24 15:39:32 »

I have created some simple buttons for an Android game and wanted to run the idea/logic by the forum to get feedback. I have classes which have vars like:

Button Class
float x, y, width, height;
Rectanlge hitbox;
String event;

Touch Class
float touch_x, touch+y;
Rectanlge hitbox;
boolean handled;

Concept
A simple screen might have 4 buttons that are put into an array, when the screen is pressed the x and y are captured and handled set to false, I then loop the button array checking for intersects and if true set menu_action to the button.event and set handled back to true.

I would handle this event and set some other boolean or string to false or "" so I know that event has been handled. When handled is true there is no need to loop the button array.

I could use scene2D but it felt overkill for such a simple task and I should imagine it deals with inputs in some similar way, checking each button that is listening?

This does work in my app I would just like some pro's or con's of doing this, is this bad practice?

Offline JVallius
« Reply #1 - Posted 2014-02-24 15:53:29 »

Once you learn scene2d it is easy to use. Do not reinvent the wheel if you do not have to.

Offline BurntPizza

« JGO Bitwise Duke »


Medals: 291
Exp: 5 years



« Reply #2 - Posted 2014-02-24 16:03:30 »

The x, y, width, and height variables are redundant if you store a rectangle.
All you need is:
1  
2  
3  
rect.contains(x, y);
//or
rect.contains(Point p);

Touch could either have an x and y or extend Point, adding the 'handled' field. No reason for a rectangle or intersects().

You are correct in using a 'handled' flag, it is used to prevent gui elements from handling events when they are underneath another element. This only works if the elements are collision-checked in order.

If that is guaranteed to never be a scenario, it is 'overkill.'

Also, don't use "" strings (or null objects) to represent a boolean state. Just use a boolean.

Past this much functionality, you might as well use scene2d, or utilize Swing if applicable, i.e. using JComponent/JPanel and MouseEvent/MouseListener.
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Offline dime26

Senior Devvie


Medals: 2
Projects: 3
Exp: 5 years


Should traffic wardens be armed?


« Reply #3 - Posted 2014-02-25 01:38:09 »

Thanks for the tips, the rectangle on they touched area is pointless so can remove that. I generally use booleans but will make a mental note not to dp otherwise.

Scene2D does look easy I was just wondering if its needed for such simple menus. I will give it a go at some point. 
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