org.scijava.ui.dnd.ListDragAndDropHandler Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of scijava-common Show documentation
Show all versions of scijava-common Show documentation
SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2017 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
* Institute of Molecular Cell Biology and Genetics, University of
* Konstanz, and KNIME GmbH.
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* #L%
*/
package org.scijava.ui.dnd;
import java.util.List;
import org.scijava.display.Display;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
/**
* Drag-and-drop handler for lists of objects.
*
* @author Curtis Rueden
* @author Barry DeZonia
*/
@Plugin(type = DragAndDropHandler.class)
public class ListDragAndDropHandler extends AbstractDragAndDropHandler>
{
@Parameter(required = false)
private DragAndDropService dragAndDropService;
// -- DragAndDropHandler methods --
@Override
public boolean supports(final List list, final Display display) {
if (dragAndDropService == null) return false;
if (!super.supports(list, display)) return false;
// empty lists are trivially compatible
if (list.size() == 0) return true;
// the list is deemed compatible if at least one item is compatible
for (final Object item : list) {
if (dragAndDropService.supports(item, display)) return true;
}
return false;
}
@Override
public boolean drop(final List list, final Display display) {
if (dragAndDropService == null) return false;
check(list, display);
if (list == null) return true; // trivial case
// dropping an empty list trivially succeeds
if (list.size() == 0) return true;
// use the drag-and-drop service to handle each item separately
boolean success = false;
for (final Object item : list) {
if (dragAndDropService.supports(item, display)) {
final boolean result = dragAndDropService.drop(item, display);
if (result) success = true;
}
}
return success;
}
// -- Typed methods --
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public Class> getType() {
return (Class) List.class;
}
}