org.dataconservancy.dcs.access.client.ui.SeadAdvancedSearchWidget.java Source code

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Here is the source code for org.dataconservancy.dcs.access.client.ui.SeadAdvancedSearchWidget.java

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/*
 * Copyright 2013 The Trustees of Indiana University
 *
 * 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 org.dataconservancy.dcs.access.client.ui;

import com.google.gwt.event.dom.client.*;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.ui.*;

import org.dataconservancy.dcs.access.client.SeadState;
import org.dataconservancy.dcs.access.client.Search;

public class SeadAdvancedSearchWidget extends Composite {

    FlowPanel advancedPanel;

    public SeadAdvancedSearchWidget(Search.UserField[] userfields, String[] userqueries) {

        advancedPanel = new FlowPanel();
        advancedPanel.setStyleName("advancedSearchPanel");
        initWidget(advancedPanel);
        Button search = new Button("Search");

        final FlexTable table = new FlexTable();

        advancedPanel.add(table);

        // Called to search filled in query

        final ClickHandler searchlistener = new ClickHandler() {

            public void onClick(ClickEvent event) {
                doSearch(table);
            }
        };

        final Button add = createNewAddButton(table);

        if (userfields != null) {
            for (int i = 0; i < userfields.length; i++) {
                if (userfields[i] == null) {
                    continue;
                }

                int row = table.getRowCount();
                addRow(table, row);

                ListBox lb = (ListBox) table.getWidget(row, 2);
                TextBox tb = (TextBox) table.getWidget(row, 0);
                tb.setText(userqueries[i]);
            }
        } else {
            addRow(table, 0);
        }

        HorizontalPanel hp = new HorizontalPanel();
        hp.setHorizontalAlignment(HorizontalPanel.ALIGN_RIGHT);
        hp.setSpacing(5);
        // hp.add(add);
        hp.add(search);

        advancedPanel.add(hp);
        hp.setWidth("80%"); // 80% to align hp to the right of AdvancedPanel
        search.addClickHandler(searchlistener);

    }

    ListBox createAdvancedSearchFieldSelector() {
        ListBox lb = new ListBox();
        // lb.setStyleName("SimpleTextBox");

        for (Search.UserField uf : Search.UserField.values()) {
            lb.addItem(uf.display);
        }

        return lb;
    }

    private void doSearch(FlexTable table) {
        // Build up search history token

        String[] data = new String[(table.getRowCount() * 2) + 1 + 1];
        int dataindex = 0;
        boolean emptyquery = true;

        for (int i = 0; i < table.getRowCount(); i++) {
            ListBox lb = (ListBox) table.getWidget(i, 2);
            TextBox tb = (TextBox) table.getWidget(i, 0);

            int sel = lb.getSelectedIndex();

            if (sel != -1) {
                String userquery = tb.getText().trim();
                String userfield = Search.UserField.values()[sel].name();

                if (userquery.isEmpty()) {
                    userfield = null;
                    userquery = null;
                } else {
                    emptyquery = false;
                }

                data[dataindex++] = userfield;
                data[dataindex++] = userquery;
            }
        }

        data[dataindex] = "0";
        data[dataindex + 1] = "0";

        if (!emptyquery) {
            History.newItem(SeadState.SEARCH.toToken(data));
        }
    }

    private void addRow(final FlexTable table, int row) {

        TextBox tb = new TextBox();
        // tb.setStyleName("SimpleTextBox");
        table.setWidget(row, 0, tb);
        table.setWidget(row, 1, new Label("in"));
        table.setWidget(row, 2, createAdvancedSearchFieldSelector());

        tb.addKeyDownHandler(new KeyDownHandler() {

            public void onKeyDown(KeyDownEvent event) {
                if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
                    doSearch(table);
                }
            }
        });

        if (row != 0) { // More than one row - can remove a row
            // final Button remove = new Button("Remove");

            table.setWidget(row, 3, createNewRemoveButton(table));

            if (row == 1) {
                // Just added a second row, need to add a remove button
                // on the first row too
                table.setWidget(0, 3, createNewRemoveButton(table));
            }

        }
        table.setWidget(row, 4, createNewAddButton(table));
    }

    private Button createNewAddButton(final FlexTable table) {
        Button newAddButton = new Button("<image src='images/add.ico'>");

        newAddButton.addStyleName("addRemoveButton");

        final ClickHandler addlistener = new ClickHandler() {

            public void onClick(ClickEvent event) {
                int nextRow = table.getRowCount();
                addRow(table, nextRow);
                table.setWidget(nextRow - 1, 4, null);
            }
        };
        newAddButton.addClickHandler(addlistener);
        return newAddButton;
    }

    private Button createNewRemoveButton(final FlexTable table) {

        Button remove = new Button("<image src='images/remove.png'>");
        remove.addStyleName("addRemoveButton");

        remove.addClickHandler(new ClickHandler() {

            public void onClick(ClickEvent event) {
                int rowIndex = table.getCellForEvent(event).getRowIndex();
                int count = table.getRowCount();
                table.removeRow(rowIndex);
                if (rowIndex == (count - 1)) {
                    // Make sure last row has an add button (if we
                    // removed the old last row)

                    table.setWidget(rowIndex - 1, 4, createNewAddButton(table));
                }
                if (count == 2) {
                    // Don't allow the last row to be removed
                    table.setWidget(0, 3, null);
                }
            }
        });
        return remove;
    }

}