int XmNexposureCallback(int w, int client_data, int call_data) {
if ((style & SWT.SEPARATOR) != 0) return 0;
int xDisplay = OS.XtDisplay(handle);
if (xDisplay == 0) return 0;
int xWindow = OS.XtWindow(handle);
if (xWindow == 0) return 0;
int[] argList = {
OS.XmNcolormap, 0,
OS.XmNwidth, 0,
OS.XmNheight, 0,
};
OS.XtGetValues(handle, argList, argList.length / 2);
int width = argList[3], height = argList[5];
Image currentImage = image;
boolean enabled = getEnabled();
if ((parent.style & SWT.FLAT) != 0) {
boolean hasCursor = hasCursor();
/* Set the shadow thickness */
int thickness = 0;
if (set || (hasCursor && enabled)) {
thickness = Math.min(2, display.buttonShadowThickness);
}
argList = new int[] {OS.XmNshadowThickness, thickness};
OS.XtSetValues(handle, argList, argList.length / 2);
/* Determine if hot image should be used */
if (enabled && hasCursor && hotImage != null) {
currentImage = hotImage;
}
}
GCData data = new GCData();
data.device = display;
data.display = xDisplay;
data.drawable = xWindow;
data.font = parent.font;
data.colormap = argList[1];
int xGC = OS.XCreateGC(xDisplay, xWindow, 0, null);
if (xGC == 0) SWT.error(SWT.ERROR_NO_HANDLES);
GC gc = GC.motif_new(xGC, data);
XmAnyCallbackStruct cb = new XmAnyCallbackStruct();
OS.memmove(cb, call_data, XmAnyCallbackStruct.sizeof);
if (cb.event != 0) {
XExposeEvent xEvent = new XExposeEvent();
OS.memmove(xEvent, cb.event, XExposeEvent.sizeof);
Rectangle rect = new Rectangle(xEvent.x, xEvent.y, xEvent.width, xEvent.height);
gc.setClipping(rect);
}
if (!enabled) {
currentImage = disabledImage;
if (currentImage == null && image != null) {
currentImage = new Image(display, image, SWT.IMAGE_DISABLE);
}
Color disabledColor = display.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
gc.setForeground(disabledColor);
} else {
gc.setForeground(parent.getForeground());
}
gc.setBackground(parent.getBackground());
int textX = 0, textY = 0, textWidth = 0, textHeight = 0;
if (text.length() != 0) {
int flags = SWT.DRAW_DELIMITER | SWT.DRAW_TAB | SWT.DRAW_MNEMONIC;
Point textExtent = gc.textExtent(text, flags);
textWidth = textExtent.x;
textHeight = textExtent.y;
}
int imageX = 0, imageY = 0, imageWidth = 0, imageHeight = 0;
if (currentImage != null) {
Rectangle imageBounds = currentImage.getBounds();
imageWidth = imageBounds.width;
imageHeight = imageBounds.height;
}
int spacing = 0;
if (textWidth != 0 && imageWidth != 0) spacing = 2;
if ((parent.style & SWT.RIGHT) != 0) {
imageX = (width - imageWidth - textWidth - spacing) / 2;
imageY = (height - imageHeight) / 2;
textX = spacing + imageX + imageWidth;
textY = (height - textHeight) / 2;
} else {
imageX = (width - imageWidth) / 2;
imageY = (height - imageHeight - textHeight - spacing) / 2;
textX = (width - textWidth) / 2;
textY = spacing + imageY + imageHeight;
}
if ((style & SWT.DROP_DOWN) != 0) {
textX -= 6;
imageX -= 6;
}
if (textWidth > 0) {
int flags = SWT.DRAW_DELIMITER | SWT.DRAW_TAB | SWT.DRAW_MNEMONIC | SWT.DRAW_TRANSPARENT;
gc.drawText(text, textX, textY, flags);
}
if (imageWidth > 0) gc.drawImage(currentImage, imageX, imageY);
if ((style & SWT.DROP_DOWN) != 0) {
int startX = width - 12, startY = (height - 2) / 2;
int[] arrow = {startX, startY, startX + 3, startY + 3, startX + 6, startY};
gc.setBackground(parent.getForeground());
gc.fillPolygon(arrow);
gc.drawPolygon(arrow);
}
gc.dispose();
OS.XFreeGC(xDisplay, xGC);
if (!enabled && disabledImage == null) {
if (currentImage != null) currentImage.dispose();
}
return 0;
}
/**
* Constructs a new instance of this class given a device and an <code>RGB</code> describing the
* desired red, green and blue values. On limited color devices, the color instance created by
* this call may not have the same RGB values as the ones specified by the argument. The RGB
* values on the returned instance will be the color values of the operating system color.
*
* <p>You must dispose the color when it is no longer required.
*
* @param device the device on which to allocate the color
* @param rgb the RGB values of the desired color
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device
* <li>ERROR_NULL_ARGUMENT - if the rgb argument is null
* <li>ERROR_INVALID_ARGUMENT - if the red, green or blue components of the argument are not
* between 0 and 255
* </ul>
*
* @see #dispose
*/
public Color(Device device, RGB rgb) {
super(device);
if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
init(rgb.red, rgb.green, rgb.blue);
init();
}
/**
* Returns an <code>RGB</code> representing the receiver.
*
* @return the RGB for the color
* @exception SWTException
* <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
* </ul>
*/
public RGB getRGB() {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return new RGB((handle.red >> 8) & 0xFF, (handle.green >> 8) & 0xFF, (handle.blue >> 8) & 0xFF);
}
void init(int red, int green, int blue) {
if ((red > 255) || (red < 0) || (green > 255) || (green < 0) || (blue > 255) || (blue < 0)) {
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
XColor xColor = new XColor();
xColor.red = (short) ((red & 0xFF) | ((red & 0xFF) << 8));
xColor.green = (short) ((green & 0xFF) | ((green & 0xFF) << 8));
xColor.blue = (short) ((blue & 0xFF) | ((blue & 0xFF) << 8));
handle = xColor;
int xDisplay = device.xDisplay;
int screen = OS.XDefaultScreen(xDisplay);
int colormap = OS.XDefaultColormap(xDisplay, screen);
/* 1. Try to allocate the color */
if (OS.XAllocColor(xDisplay, colormap, xColor) != 0) {
if (device.colorRefCount != null) {
/* Make a copy of the color to put in the colors array */
XColor colorCopy = new XColor();
colorCopy.red = xColor.red;
colorCopy.green = xColor.green;
colorCopy.blue = xColor.blue;
colorCopy.pixel = xColor.pixel;
device.xcolors[colorCopy.pixel] = colorCopy;
device.colorRefCount[xColor.pixel]++;
}
return;
}
/*
* 2. Allocation failed. Query the entire colormap and
* find the closest match which can be allocated.
* This should never occur on a truecolor display.
*/
Visual visual = new Visual();
OS.memmove(visual, OS.XDefaultVisual(xDisplay, screen), Visual.sizeof);
int mapEntries = visual.map_entries;
XColor[] queried = new XColor[mapEntries];
int[] distances = new int[mapEntries];
/*
* Query all colors in the colormap and calculate the distance
* from each to the desired color.
*/
for (int i = 0; i < mapEntries; i++) {
XColor color = new XColor();
color.pixel = i;
queried[i] = color;
OS.XQueryColor(xDisplay, colormap, color);
int r = red - ((color.red >> 8) & 0xFF);
int g = green - ((color.green >> 8) & 0xFF);
int b = blue - ((color.blue >> 8) & 0xFF);
distances[i] = r * r + g * g + b * b;
}
/*
* Try to allocate closest matching queried color.
* The allocation can fail if the closest matching
* color is allocated privately, so go through them
* in order of increasing distance.
*/
for (int i = 0; i < mapEntries; i++) {
int minDist = 0x30000;
int minIndex = 0;
for (int j = 0; j < mapEntries; j++) {
if (distances[j] < minDist) {
minDist = distances[j];
minIndex = j;
}
}
XColor queriedColor = queried[minIndex];
XColor osColor = new XColor();
osColor.red = queriedColor.red;
osColor.green = queriedColor.green;
osColor.blue = queriedColor.blue;
if (OS.XAllocColor(xDisplay, colormap, osColor) != 0) {
/* Allocation succeeded. Copy the fields into the handle */
xColor.red = osColor.red;
xColor.green = osColor.green;
xColor.blue = osColor.blue;
xColor.pixel = osColor.pixel;
if (device.colorRefCount != null) {
/* Put osColor in the colors array */
device.xcolors[osColor.pixel] = osColor;
device.colorRefCount[osColor.pixel]++;
}
return;
}
/* The allocation failed; matching color is allocated privately */
distances[minIndex] = 0x30000;
}
/*
* 3. Couldn't allocate any of the colors in the colormap.
* This means all colormap entries were allocated privately
* by other applications. Give up and allocate black.
*/
XColor osColor = new XColor();
OS.XAllocColor(xDisplay, colormap, osColor);
/* Copy the fields into the handle */
xColor.red = osColor.red;
xColor.green = osColor.green;
xColor.blue = osColor.blue;
xColor.pixel = osColor.pixel;
if (device.colorRefCount != null) {
/* Put osColor in the colors array */
device.xcolors[osColor.pixel] = osColor;
device.colorRefCount[osColor.pixel]++;
}
}
/**
* Returns the amount of red in the color, from 0 to 255.
*
* @return the red component of the color
* @exception SWTException
* <ul>
* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
* </ul>
*/
public int getRed() {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
return (handle.red >> 8) & 0xFF;
}
