com.google.gwt.editor.client.adapters.HasDataEditor Maven / Gradle / Ivy
/*
* Copyright 2010 Google Inc.
*
* 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.google.gwt.editor.client.adapters;
import com.google.gwt.editor.client.LeafValueEditor;
import com.google.gwt.view.client.HasData;
import java.util.Collections;
/**
* Adapts the HasData interface to the Editor framework.
*
* @param the type of data to be edited
*/
public class HasDataEditor extends ListEditor> {
static class HasDataEditorSource extends EditorSource> {
private final HasData data;
public HasDataEditorSource(HasData data) {
this.data = data;
}
@Override
public IndexedEditor create(int index) {
assert index >= 0;
return new IndexedEditor(index, data);
}
@Override
public LeafValueEditor createEditorForTraversal() {
return new IndexedEditor(-1, null);
}
@Override
public void dispose(LeafValueEditor subEditor) {
// We use a negative index as flag in createEditorForTraversal
assert ((IndexedEditor) subEditor).index >= 0;
data.setRowCount(data.getRowCount() - 1);
}
@Override
public void setIndex(LeafValueEditor editor, int index) {
assert index >= 0;
((IndexedEditor) editor).setIndex(index);
}
}
private static class IndexedEditor implements LeafValueEditor {
private int index;
private Q value;
private final HasData data;
IndexedEditor(int index, HasData data) {
this.index = index;
this.data = data;
}
@Override
public Q getValue() {
return value;
}
@Override
public void setValue(Q value) {
this.value = value;
push();
}
void setIndex(int index) {
assert index >= 0;
this.index = index;
push();
}
private void push() {
if (data != null) {
data.setRowData(index, Collections.singletonList(value));
}
}
}
/**
* Create a HasDataEditor backed by a HasData.
*
* @param the type of data to be edited
* @param data the HasData that is displaying the data
* @return a instance of a HasDataEditor
*/
public static HasDataEditor of(HasData data) {
return new HasDataEditor(data);
}
/**
* Prevent subclassing.
*/
private HasDataEditor(HasData data) {
super(new HasDataEditorSource(data));
}
}