/**
* Centers the popup in the browser window and shows it. If the popup was already showing, then
* the popup is centered.
*/
public void center() {
boolean initiallyShowing = showing;
boolean initiallyAnimated = isAnimationEnabled;
if (!initiallyShowing) {
setVisible(false);
setAnimationEnabled(false);
show();
}
// If left/top are set from a previous center() call, and our content
// has changed, we may get a bogus getOffsetWidth because our new content
// is wrapping (giving a lower offset width) then it would without the
// previous left. Setting left/top back to 0 avoids this.
Element elem = getElement();
elem.getStyle().setPropertyPx("left", 0);
elem.getStyle().setPropertyPx("top", 0);
int left = (Window.getClientWidth() - getOffsetWidth()) >> 1;
int top = (Window.getClientHeight() - getOffsetHeight()) >> 1;
setPopupPosition(
Math.max(Window.getScrollLeft() + left, 0), Math.max(Window.getScrollTop() + top, 0));
if (!initiallyShowing) {
setAnimationEnabled(initiallyAnimated);
// Run the animation. The popup is already visible, so we can skip the
// call to setState.
if (initiallyAnimated) {
impl.setClip(getElement(), "rect(0px, 0px, 0px, 0px)");
setVisible(true);
resizeAnimation.run(ANIMATION_DURATION);
} else {
setVisible(true);
}
}
}