com.google.gapid.util.Tables.java Source code

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Here is the source code for com.google.gapid.util.Tables.java

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/*
 * Copyright (C) 2017 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.gapid.util;

import static com.google.gapid.util.GeoUtils.bottom;
import static java.util.Collections.emptySet;

import com.google.common.collect.Sets;

import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;

import java.util.Set;

/**
 * Utilities for dealing with {@link Table Tables} and {@link TableItem TableItems}.
 */
public class Tables {
    private Tables() {
    }

    /**
     * @return the {@link TableItem TableItems} that are currently visible in the table.
     */
    public static Set<TableItem> getVisibleItems(Table table) {
        int items = table.getItemCount();
        if (items == 0) {
            return emptySet();
        }

        int tableBottom = bottom(table.getClientArea());
        Set<TableItem> visible = Sets.newIdentityHashSet();
        for (int index = table.getTopIndex(); index < items; index++) {
            TableItem item = table.getItem(index);
            visible.add(table.getItem(index));
            if (bottom(item.getBounds()) > tableBottom) {
                break;
            }
        }
        return visible;
    }
}