public void scrollToAttribute(Attribute a) {
if (!a.getDescriptor().getConfig().equals(getConfig())) {
logger.fine("Cannot scroll to attribute that isn't attached to this type of descriptor");
return;
}
int rowIndex = getCurrentModel().getRowForDescriptor(a.getDescriptor());
int colIndex = getCurrentModel().getColumnForAttribute(a);
JScrollPane scrollPane = (JScrollPane) this.getComponent(0);
JViewport viewport = (JViewport) scrollPane.getViewport();
EnhancedTable table = (EnhancedTable) viewport.getView();
// This rectangle is relative to the table where the
// northwest corner of cell (0,0) is always (0,0).
Rectangle rect = table.getCellRect(rowIndex, colIndex, true);
// The location of the viewport relative to the table
Point pt = viewport.getViewPosition();
// Translate the cell location so that it is relative
// to the view, assuming the northwest corner of the
// view is (0,0)
rect.setLocation(rect.x - pt.x, rect.y - pt.y);
// Scroll the area into view
viewport.scrollRectToVisible(rect);
}
/**
* Method to check that the current position is in the viewing area and if not scroll to center
* the current position if possible
*/
public void checkScroll() {
// get the x and y position in pixels
int xPos = (int) (colIndex * zoomFactor);
int yPos = (int) (rowIndex * zoomFactor);
// only do this if the image is larger than normal
if (zoomFactor > 1) {
// get the rectangle that defines the current view
JViewport viewport = scrollPane.getViewport();
Rectangle rect = viewport.getViewRect();
int rectMinX = (int) rect.getX();
int rectWidth = (int) rect.getWidth();
int rectMaxX = rectMinX + rectWidth - 1;
int rectMinY = (int) rect.getY();
int rectHeight = (int) rect.getHeight();
int rectMaxY = rectMinY + rectHeight - 1;
// get the maximum possible x and y index
int macolIndexX = (int) (picture.getWidth() * zoomFactor) - rectWidth - 1;
int macolIndexY = (int) (picture.getHeight() * zoomFactor) - rectHeight - 1;
// calculate how to position the current position in the middle of the viewing
// area
int viewX = xPos - (int) (rectWidth / 2);
int viewY = yPos - (int) (rectHeight / 2);
// reposition the viewX and viewY if outside allowed values
if (viewX < 0) viewX = 0;
else if (viewX > macolIndexX) viewX = macolIndexX;
if (viewY < 0) viewY = 0;
else if (viewY > macolIndexY) viewY = macolIndexY;
// move the viewport upper left point
viewport.scrollRectToVisible(new Rectangle(viewX, viewY, rectWidth, rectHeight));
}
}