Added VisImageButton constructor for images (up/down/checked) and stylename based buttons.

[lyze237]

As far as I understand the source code, it's currently not possible to create a VisImageButton which uses the "toggle" stylename (=> the blue background, without the "toggle" style it would have no blue background).

Therefore, I added a new constructor for the VisImageButton class which allows you to do that.

Example code:

table.add(new VisImageButton(upImage, downImage, checkedImage, "toggle"));

Example image ( Thanks @Travall ):

[kotcrab]

Please change VisImageButton (Drawable imageUp, Drawable imageDown, Drawable imageChecked) to use this new constructor (constructor chaining) to avoid code duplication. It should pass "default" style name to your new constructor.

[kotcrab]

As far as I understand the source code, it's currently not possible to create a VisImageButton which uses the "toggle" stylename

I guess you could do that manually by obtaining the toggle Style from Skin and using VisImageButton (VisImageButtonStyle style) constructor

[kotcrab]

Thanks! I fixed formatting of the code (tabs vs spaces)