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Button Image on Windows shows background color instead of appearing transparent [message #447881]

Mon, 20 December 2004 22:54

Marc Boorshtein

Messages: 24
Registered: July 2009

Junior Member

Hello,

I have an SWT application which uses images on buttons (using the
setImage() method). These button images are straight from the eclipse
distro. When used in menus or coolbars, the image is transparent. But
when in a button (on windows only, mac and gtk appear to work fine) the
image has a white background. Am I missing something? Does something
need to be done to ensure that the button's image displays properly?

Thanks
Marc Boorshtein

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Re: Button Image on Windows shows background color instead of appearing transparent [message #448416 is a reply to message #447881]

Sun, 09 January 2005 12:42

Max

Messages: 28
Registered: July 2009

Junior Member

In article <cq7l72$bcn$1@www.eclipse.org>,
marc.boorshtein@octetstring.com says...

> I have an SWT application which uses images on buttons (using the
> setImage() method). These button images are straight from the eclipse
> distro. When used in menus or coolbars, the image is transparent. But
> when in a button (on windows only, mac and gtk appear to work fine) the
> image has a white background. Am I missing something? Does something
> need to be done to ensure that the button's image displays properly?

Snip from SWT javadoc for Image:

setBackground

public void setBackground(Color color)
Sets the color to which to map the transparent pixel.

There are certain uses of Images that do not support transparency (for
example, setting an image into a button or label). In these cases, it
may be desired to simulate transparency by using the background color of
the widget to paint the transparent pixels of the image. This method
specifies the color that will be used in these cases. For example:

Button b = new Button();
image.setBackground(b.getBackground());
b.setImage(image);

--
Regards Max rotvel AT bolignet-aarhus DOT dk

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