/** Resizes selected and sibling columns. */
protected void resize() {
int position = this.currentX;
int delta = position - startX;
Element tr = DOM.getParent(th);
int left = DOM.getAbsoluteLeft(th);
int width = getElementWidth(th);
Element sibling = null;
int sign = 0;
int thIndex = DOM.getChildIndex(tr, th);
if (startX <= left + 2) {
sign = 1;
sibling = DOM.getChild(tr, thIndex - 1);
} else if (startX >= left + width - 2) {
sign = -1;
sibling = DOM.getChild(tr, thIndex + 1);
}
int thExpectedWidth = width - sign * delta;
int siblingExpectedWidth;
int siblingIndex;
if (sibling != null) {
siblingExpectedWidth = getElementWidth(sibling) + sign * delta;
siblingIndex = DOM.getChildIndex(tr, sibling);
} else {
siblingExpectedWidth = 0;
siblingIndex = -1;
}
// interrupt immediately
if (thExpectedWidth < 3 || siblingExpectedWidth < 3 && siblingIndex > -1) {
th = null;
return;
}
if (siblingIndex > -1) {
grid.setColumnWidth(thIndex, thExpectedWidth);
grid.setColumnWidth(siblingIndex, siblingExpectedWidth);
}
int thWidthNow = getElementWidth(th);
int siblingWidthNow;
if (siblingIndex > -1) siblingWidthNow = getElementWidth(sibling);
else siblingWidthNow = 0;
if (thWidthNow > thExpectedWidth)
grid.setColumnWidth(thIndex, 2 * thExpectedWidth - thWidthNow);
if (siblingWidthNow > siblingExpectedWidth && siblingIndex > -1)
grid.setColumnWidth(siblingIndex, 2 * siblingExpectedWidth - siblingWidthNow);
this.startX = position;
}
/**
* This method interrupts resiszing.
*
* @param event is an event.
*/
protected void interruptResizing(Event event) {
int positionX = getPositionX(event);
int positionY = getPositionY(event);
Element thead = grid.getTHeadElement();
int left = DOM.getAbsoluteLeft(thead);
int top = DOM.getAbsoluteTop(thead);
int width = getElementWidth(thead);
int height = getElementHeight(thead);
if (positionX < left
|| positionX > left + width
|| positionY < top
|| positionY > top + height) {
th = null;
timer.cancel();
}
}