/*
* Copyright 2008 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.widgetideas.table.client;
import com.google.gwt.widgetideas.table.client.overrides.Grid;
import java.util.Iterator;
/**
* Allows bulk rendering of {@link Grid}s.
* <p>
* Must use the {@link Grid} in the overrides package.
* </p>
*
*/
public class GridBulkRenderer extends TableBulkRenderer {
/**
* Grids need repair code after the table is constructed. The
* {@link ChainingCallback} allows the bulk renderer to insert repair code
* before the user's callback is called.
*/
protected class ChainingCallback implements RendererCallback {
private RendererCallback userCallback;
ChainingCallback(RendererCallback userCallback) {
this.userCallback = userCallback;
}
public void onRendered() {
localOnRendered();
if (this.userCallback != null) {
this.userCallback.onRendered();
}
}
protected void localOnRendered() {
Grid table = (Grid) getTable();
setGridDimensions(table);
}
}
/**
* Constructor.
*
* @param grid Grid to be be bulk rendered
*/
public GridBulkRenderer(Grid grid) {
super(grid);
if (grid instanceof FixedWidthGrid
&& (!(this instanceof FixedWidthGridBulkRenderer))) {
throw new UnsupportedOperationException(
"Must use a FixedWidthGridBulkLoader to bulk load a fixed grid");
}
}
/**
* Adds the chaining callback to the given options. Pulled out to allow
* subclasses to override.
*
* @param options options to add the chaining callback to
*/
protected void addChainingCallback(final RenderingOptions options) {
// Set the callback.
options.callback = new ChainingCallback(options.callback);
}
@Override
protected void renderRows(Iterator<Iterator<Object>> iterator,
final RenderingOptions options) {
addChainingCallback(options);
// TODO long term we want to copy the generic algorithm and do some checks
// that each row is the same length.
// Render the rows.
super.renderRows(iterator, options);
}
/**
* Short term hack to set protected row and columns.
*/
native void setGridDimensions(Grid table) /*-{
var numRows = table.@com.google.gwt.widgetideas.table.client.overrides.HTMLTable::getDOMRowCount()();
table.@com.google.gwt.widgetideas.table.client.overrides.Grid::numRows = numRows;
table.@com.google.gwt.widgetideas.table.client.overrides.Grid::numColumns =
table.@com.google.gwt.widgetideas.table.client.overrides.HTMLTable::getDOMCellCount(I)(numRows - 1);
}-*/;
}