org.obiba.opal.web.gwt.app.client.view.ItemSelectorView.java Source code

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Here is the source code for org.obiba.opal.web.gwt.app.client.view.ItemSelectorView.java

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/*******************************************************************************
 * Copyright 2008(c) The OBiBa Consortium. All rights reserved.
 *
 * This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package org.obiba.opal.web.gwt.app.client.view;

import java.util.ArrayList;
import java.util.List;

import org.obiba.opal.web.gwt.app.client.presenter.ItemSelectorPresenter;
import org.obiba.opal.web.gwt.app.client.presenter.ItemSelectorPresenter.EnterKeyHandler;
import org.obiba.opal.web.gwt.app.client.presenter.ItemSelectorPresenter.ItemInputDisplay;

import com.github.gwtbootstrap.client.ui.Button;
import com.github.gwtbootstrap.client.ui.base.IconAnchor;
import com.github.gwtbootstrap.client.ui.constants.ButtonType;
import com.github.gwtbootstrap.client.ui.constants.IconType;
import com.google.common.collect.Lists;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;
import com.gwtplatform.mvp.client.ViewImpl;

public class ItemSelectorView extends ViewImpl implements ItemSelectorPresenter.Display {

    private Widget widget;

    private final Grid itemGrid;

    private ItemInputDisplay itemInputDisplay;

    private List<String> itemList = Lists.newArrayList();

    public ItemSelectorView() {
        itemGrid = new Grid(0, 1);
    }

    @Override
    public void setItems(Iterable<String> items) {
        clear();
        for (String s : items) {
            addItem(s);
        }
    }

    @Override
    public void setItemInputDisplay(ItemInputDisplay itemInputDisplay) {
        this.itemInputDisplay = itemInputDisplay;

        // Add a row for the input widget.
        itemGrid.resize(1, 1);

        FlowPanel itemWidget = new FlowPanel();
        Widget itemInputWidget = itemInputDisplay.asWidget();
        itemInputWidget.addStyleName("inline-block");
        itemWidget.add(itemInputWidget);

        // Put an "add" button in the second column.
        Button addWidget = createAddWidget();
        addWidget.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                addItemAndClear();
            }
        });
        addWidget.addStyleName("small-indent neg-top-margin");
        itemWidget.add(addWidget);

        // Add the input widget in the first column.
        itemGrid.setWidget(itemGrid.getRowCount() - 1, 0, itemWidget);

        // Put the Grid in a FlowPanel (so that it doesn't expand to fill its parent) and set that as the widget.
        FlowPanel container = new FlowPanel();
        container.add(itemGrid);
        widget = container;

        setEnterKeyHandler();
    }

    @Override
    public void addItem(final String item) {
        // Add a row for the new item.
        itemGrid.resize(itemGrid.getRowCount() + 1, 1);

        itemList.add(item);
        FlowPanel itemWidget = new FlowPanel();
        Label label = new Label(itemInputDisplay.renderItem(item));
        label.addStyleName("inline-block");
        itemWidget.add(label);

        // Put a "remove" button in the second column.
        IconAnchor removeWidget = createRemoveWidget();
        removeWidget.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                for (int i = 0; i < itemList.size(); i++) {
                    if (itemList.get(i).equals(item)) {
                        removeItem(i);
                        break;
                    }
                }
            }
        });
        removeWidget.addStyleName("small-indent");
        itemWidget.add(removeWidget);
        itemGrid.setWidget(itemGrid.getRowCount() - 1, 0, itemWidget);
    }

    /**
     * Removes the item at the specified row.
     *
     * @param row row index of item to remove (zero-based)
     */
    @Override
    public void removeItem(int row) {
        itemList.remove(row);
        itemGrid.removeRow(row + 1); // +1 to skip the input widget row
    }

    @Override
    public void clear() {
        itemList.clear();
        while (itemGrid.getRowCount() > 1) { // 1 is for the input widget
            removeItem(0);
        }
    }

    @Override
    public int getItemCount() {
        return itemList.size();
    }

    @Override
    public List<String> getItems() {
        return itemList;
    }

    @Override
    public Widget asWidget() {
        return widget;
    }

    //
    // Methods
    //

    private Button createAddWidget() {
        Button btn = new Button("Add");
        btn.setType(ButtonType.SUCCESS);
        return btn;
    }

    private IconAnchor createRemoveWidget() {
        IconAnchor btn = new IconAnchor();
        btn.setIcon(IconType.REMOVE);
        return btn;
    }

    private void addItemAndClear() {
        String item = itemInputDisplay.getItem();
        if (item.trim().length() != 0) {
            addItem(item);
            itemInputDisplay.clear();
        }
    }

    private void setEnterKeyHandler() {
        itemInputDisplay.setEnterKeyHandler(new EnterKeyHandler() {

            @Override
            public void enterKeyPressed() {
                addItemAndClear();
            }
        });
    }
}