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| public static void setButtonUI(Button button, String caption, Image icon) {
if (icon != null) {
/*
* FEATURE IN SWT: Button can't display both an image and a
* text caption at the same time. The workaround is to make
* your own image containing the icon and the caption and use
* that instead.
*/
// We still have to set the text in order for accelerator keys to
// work correctly. The text just won't be displayed once the
// image is set.
button.setText(caption);
// Figure out how big everything has to be
Rectangle iconSize = icon.getBounds();
GC gc = new GC(button);
Point captionSize = gc.textExtent(caption, SWT.DRAW_MNEMONIC);
Rectangle iconTotalSize = icon.getBounds();
iconTotalSize.width += 4;
iconTotalSize.width += captionSize.x;
gc.dispose();
// Draw the icon
Image image = new Image(Display.getDefault(), iconTotalSize.width,
iconTotalSize.height);
gc = new GC(image);
gc.setBackground(Display.getDefault().getSystemColor(
SWT.COLOR_BLACK));
gc.setForeground(button.getForeground());
gc.fillRectangle(iconTotalSize);
if (iconSize.height > captionSize.y) {
gc.drawImage(icon, 0, 0);
gc.setFont(button.getFont());
gc.drawText(caption, iconSize.width + 2,
iconSize.height - captionSize.y
- (iconSize.height - captionSize.y) / 2,
SWT.DRAW_MNEMONIC | SWT.DRAW_TRANSPARENT);
} else {
gc.drawImage(icon, 0,
captionSize.y - iconSize.height
- (captionSize.y - iconSize.height) / 2);
gc.setFont(button.getFont());
gc.drawText(caption, iconSize.width + 2, 0, SWT.DRAW_MNEMONIC
| SWT.DRAW_TRANSPARENT);
}
gc.dispose();
// Draw the transparancy mask
ImageData iconTransparancy = icon.getImageData()
.getTransparencyMask();
Image iconTransparancyMask = new Image(Display.getDefault(),
iconTransparancy);
PaletteData palette = new PaletteData(new RGB[] { new RGB(0, 0, 0), // transparant pixels are white
new RGB(0xFF, 0xFF, 0xFF), // opaque pixels are black
});
ImageData maskData = new ImageData(iconTotalSize.width,
iconTotalSize.height, 1, palette);
Image mask = new Image(Display.getDefault(), maskData);
gc = new GC(mask);
gc.setBackground(Display.getDefault().getSystemColor(
SWT.COLOR_BLACK));
gc.fillRectangle(0, 0, iconTotalSize.width, iconTotalSize.height);
if (iconSize.height > captionSize.y) {
gc.setBackground(Display.getDefault().getSystemColor(
SWT.COLOR_WHITE));
gc.drawImage(iconTransparancyMask, 0, 0);
gc.setForeground(Display.getDefault().getSystemColor(
SWT.COLOR_WHITE));
gc.drawText(caption, iconSize.width + 2,
iconSize.height - captionSize.y
- (iconSize.height - captionSize.y) / 2,
SWT.DRAW_MNEMONIC | SWT.DRAW_TRANSPARENT);
} else {
gc.setBackground(Display.getDefault().getSystemColor(
SWT.COLOR_WHITE));
gc.drawImage(iconTransparancyMask, 0,
captionSize.y - iconSize.height
- (captionSize.y - iconSize.height) / 2);
gc.setForeground(Display.getDefault().getSystemColor(
SWT.COLOR_WHITE));
gc.drawText(caption, iconSize.width + 2, 0, SWT.DRAW_MNEMONIC
| SWT.DRAW_TRANSPARENT);
}
gc.dispose();
// Get the data for the image and mask so we can compose them into
// the final icon...
maskData = mask.getImageData();
mask.dispose();
ImageData imageData = image.getImageData();
image.dispose();
// Make the final image (including transparancy)
Image iconPlusText = new Image(Display.getDefault(), imageData,
maskData);
button.setImage(iconPlusText);
} else {
button.setText(caption);
}
} |
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