com.vaadin.client.ui.dd.DDUtil Maven / Gradle / Ivy
/*
* Copyright 2000-2018 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.client.ui.dd;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.user.client.Window;
import com.vaadin.client.WidgetUtil;
import com.vaadin.shared.ui.dd.HorizontalDropLocation;
import com.vaadin.shared.ui.dd.VerticalDropLocation;
public class DDUtil {
public static VerticalDropLocation getVerticalDropLocation(Element element,
NativeEvent event, double topBottomRatio) {
int offsetHeight = element.getOffsetHeight();
return getVerticalDropLocation(element, offsetHeight, event,
topBottomRatio);
}
public static VerticalDropLocation getVerticalDropLocation(Element element,
int offsetHeight, NativeEvent event, double topBottomRatio) {
int clientY = WidgetUtil.getTouchOrMouseClientY(event);
return getVerticalDropLocation(element, offsetHeight, clientY,
topBottomRatio);
}
public static VerticalDropLocation getVerticalDropLocation(Element element,
int offsetHeight, int clientY, double topBottomRatio) {
// Event coordinates are relative to the viewport, element absolute
// position is relative to the document. Make element position relative
// to viewport by adjusting for viewport scrolling. See #6021
int elementTop = element.getAbsoluteTop() - Window.getScrollTop();
int fromTop = clientY - elementTop;
float percentageFromTop = (fromTop / (float) offsetHeight);
if (percentageFromTop < topBottomRatio) {
return VerticalDropLocation.TOP;
} else if (percentageFromTop > 1 - topBottomRatio) {
return VerticalDropLocation.BOTTOM;
} else {
return VerticalDropLocation.MIDDLE;
}
}
public static HorizontalDropLocation getHorizontalDropLocation(
Element element, NativeEvent event, double leftRightRatio) {
int clientX = WidgetUtil.getTouchOrMouseClientX(event);
// Event coordinates are relative to the viewport, element absolute
// position is relative to the document. Make element position relative
// to viewport by adjusting for viewport scrolling. See #6021
int elementLeft = element.getAbsoluteLeft() - Window.getScrollLeft();
int offsetWidth = element.getOffsetWidth();
int fromLeft = clientX - elementLeft;
float percentageFromLeft = (fromLeft / (float) offsetWidth);
if (percentageFromLeft < leftRightRatio) {
return HorizontalDropLocation.LEFT;
} else if (percentageFromLeft > 1 - leftRightRatio) {
return HorizontalDropLocation.RIGHT;
} else {
return HorizontalDropLocation.CENTER;
}
}
}