/*
* Copyright 2000-2014 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.calendar.schedule.dd;
import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.DOM;
import com.vaadin.client.Util;
import com.vaadin.client.ui.calendar.CalendarConnector;
import com.vaadin.client.ui.calendar.schedule.SimpleDayCell;
import com.vaadin.client.ui.dd.VAcceptCallback;
import com.vaadin.client.ui.dd.VDragEvent;
/**
* Handles DD when the monthly view is showing in the Calendar. In the monthly
* view, drops are only allowed in the the day cells. Only the day index is
* included in the drop details sent to the server.
*
* @since 7.1
* @author Vaadin Ltd.
*/
public class CalendarMonthDropHandler extends CalendarDropHandler {
public CalendarMonthDropHandler(CalendarConnector connector) {
super(connector);
}
private Element currentTargetElement;
private SimpleDayCell currentTargetDay;
/*
* (non-Javadoc)
*
* @see
* com.vaadin.terminal.gwt.client.ui.dd.VAbstractDropHandler#dragAccepted
* (com.vaadin.terminal.gwt.client.ui.dd.VDragEvent)
*/
@Override
protected void dragAccepted(VDragEvent drag) {
deEmphasis();
currentTargetElement = drag.getElementOver();
currentTargetDay = Util.findWidget(currentTargetElement,
SimpleDayCell.class);
emphasis();
}
/**
* Removed the emphasis CSS style name from the currently emphasized day
*/
private void deEmphasis() {
if (currentTargetElement != null && currentTargetDay != null) {
currentTargetDay.removeEmphasisStyle();
currentTargetElement = null;
}
}
/**
* Add CSS style name for the currently emphasized day
*/
private void emphasis() {
if (currentTargetElement != null && currentTargetDay != null) {
currentTargetDay.addEmphasisStyle();
}
}
/*
* (non-Javadoc)
*
* @see
* com.vaadin.terminal.gwt.client.ui.dd.VAbstractDropHandler#dragOver(com
* .vaadin.terminal.gwt.client.ui.dd.VDragEvent)
*/
@Override
public void dragOver(final VDragEvent drag) {
if (isLocationValid(drag.getElementOver())) {
validate(new VAcceptCallback() {
@Override
public void accepted(VDragEvent event) {
dragAccepted(drag);
}
}, drag);
}
}
/**
* Checks if the one can perform a drop in a element
*
* @param elementOver
* The element to check
* @return
*/
private boolean isLocationValid(Element elementOver) {
Element monthGridElement = calendarConnector.getWidget().getMonthGrid()
.getElement();
// drops are not allowed in:
// - weekday header
// - week number bart
return DOM.isOrHasChild(monthGridElement, elementOver);
}
/*
* (non-Javadoc)
*
* @see
* com.vaadin.terminal.gwt.client.ui.dd.VAbstractDropHandler#dragEnter(com
* .vaadin.terminal.gwt.client.ui.dd.VDragEvent)
*/
@Override
public void dragEnter(VDragEvent drag) {
// NOOP, we determine drag acceptance in dragOver
}
/*
* (non-Javadoc)
*
* @see
* com.vaadin.terminal.gwt.client.ui.dd.VAbstractDropHandler#drop(com.vaadin
* .terminal.gwt.client.ui.dd.VDragEvent)
*/
@Override
public boolean drop(VDragEvent drag) {
if (isLocationValid(drag.getElementOver())) {
updateDropDetails(drag);
deEmphasis();
return super.drop(drag);
} else {
deEmphasis();
return false;
}
}
/**
* Updates the drop details sent to the server
*
* @param drag
* The drag event
*/
private void updateDropDetails(VDragEvent drag) {
int dayIndex = calendarConnector.getWidget().getMonthGrid()
.getDayCellIndex(currentTargetDay);
drag.getDropDetails().put("dropDayIndex", dayIndex);
}
/*
* (non-Javadoc)
*
* @see
* com.vaadin.terminal.gwt.client.ui.dd.VAbstractDropHandler#dragLeave(com
* .vaadin.terminal.gwt.client.ui.dd.VDragEvent)
*/
@Override
public void dragLeave(VDragEvent drag) {
deEmphasis();
super.dragLeave(drag);
}
}