Example usage for com.vaadin.client WidgetUtil mayHaveScrollBars

Introduction

In this page you can find the example usage for com.vaadin.client WidgetUtil mayHaveScrollBars.

Prototype

public static boolean mayHaveScrollBars(com.google.gwt.dom.client.Element pe) 

Source Link

Document

Detects what is currently the overflow style attribute in given element.

Usage

From source file:com.haulmont.cuba.web.widgets.client.addons.dragdroplayouts.ui.VLayoutDragDropMouseHandler.java

License:Apache License

private boolean isEventOnScrollBar(NativeEvent event) {
    Element element = Element.as(event.getEventTarget());
    ;//  w w  w .j  a v  a2  s.co m

    if (WidgetUtil.mayHaveScrollBars(element)) {

        final int nativeScrollbarSize = WidgetUtil.getNativeScrollbarSize();

        int x = WidgetUtil.getTouchOrMouseClientX(event) - element.getAbsoluteLeft();
        int y = WidgetUtil.getTouchOrMouseClientY(event) - element.getAbsoluteTop();

        // Hopefully we have horizontal scroll.
        final int scrollWidth = element.getScrollWidth();
        final int clientWidth = element.getClientWidth();
        if (scrollWidth > clientWidth && clientWidth - nativeScrollbarSize < x) {
            return true;
        }

        // Hopefully we have vertical scroll.
        final int scrollHeight = element.getScrollHeight();
        final int clientHeight = element.getClientHeight();
        if (scrollHeight > clientHeight && clientHeight - nativeScrollbarSize < y) {
            return true;
        }

    }

    return false;
}

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