com.metadot.book.connectr.client.view.FriendListView.java Source code

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Here is the source code for com.metadot.book.connectr.client.view.FriendListView.java

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/** 
 * Copyright 2010 Daniel Guermeur and Amy Unruh
 *
 *   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.
 *
 *   See http://connectrapp.appspot.com/ for a demo, and links to more information 
 *   about this app and the book that it accompanies.
 */
package com.metadot.book.connectr.client.view;

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

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.HasClickHandlers;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.CheckBox;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HTMLTable;
import com.google.gwt.user.client.ui.Hyperlink;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;
import com.metadot.book.connectr.client.helper.ClickPoint;
import com.metadot.book.connectr.client.presenter.FriendListPresenter;
import com.metadot.book.connectr.client.resources.GlobalResources;

public class FriendListView extends Composite implements FriendListPresenter.Display {

    @UiField
    FlexTable friendsTable;

    @UiField
    Hyperlink addNew;

    @UiField
    Label loadingLabel;

    private static FriendListUiBinder uiBinder = GWT.create(FriendListUiBinder.class);

    interface FriendListUiBinder extends UiBinder<Widget, FriendListView> {
    }

    /**
     * Constructor
     */
    public FriendListView() {
        initWidget(uiBinder.createAndBindUi(this));
    }

    private void displayFriends(List<String> friends) {

        int i = 0;
        friendsTable.clear();

        if (friends == null || friends.size() == 0) {
            loadingLabel.setText("No friends.");
            return;
        }

        loadingLabel.setVisible(false);
        for (final String friend : friends) {
            CheckBox checkBoxName = new CheckBox(truncateLongName(friend));
            checkBoxName.setValue(true);
            final Image propertyButton = new Image(GlobalResources.RESOURCE.propertyButton());
            propertyButton.setStyleName("pointer");

            friendsTable.setWidget(i, 0, checkBoxName);
            friendsTable.setWidget(i, 1, propertyButton);
            friendsTable.getCellFormatter().addStyleName(i, 0, "friendNameInList");
            i++;
        }

    }

    /**
     * Shorten long displayName to something smaller if name is too long.
     * 
     * @param displayName
     * @return a possibly truncated displayNames
     */
    private String truncateLongName(String displayName) {
        final int MAX = 18; // truncate string if longer than MAX
        final String SUFFIX = "...";

        if (displayName.length() < MAX)
            return displayName;

        String shortened = displayName.substring(0, MAX - SUFFIX.length()) + SUFFIX;

        return shortened;
    }

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

    @Override
    public HasClickHandlers getAddButton() {
        return addNew;
    }

    @Override
    public int getClickedRow(ClickEvent event) {
        int selectedRow = -1;
        HTMLTable.Cell cell = friendsTable.getCellForEvent(event);

        if (cell != null) {
            // Suppress clicks if not on the property button
            if (cell.getCellIndex() > 0) {
                selectedRow = cell.getRowIndex();
            }
        }

        return selectedRow;
    }

    @Override
    public ClickPoint getClickedPoint(ClickEvent event) {
        final Image img;
        int selectedRow = -1;
        ClickPoint point = null;
        HTMLTable.Cell cell = friendsTable.getCellForEvent(event);

        if (cell != null) {
            // Suppress clicks if not on the property button
            if (cell.getCellIndex() > 0) {
                selectedRow = cell.getRowIndex();
                img = (Image) friendsTable.getWidget(selectedRow, 1);
                int left = img.getAbsoluteLeft();
                int top = img.getAbsoluteTop();
                point = new ClickPoint(top, left);
            }
        }

        return point;
    }

    @Override
    public HasClickHandlers getList() {
        return friendsTable;
    }

    @Override
    public List<Integer> getSelectedRows() {
        List<Integer> selectedRows = new ArrayList<Integer>();

        for (int i = 0; i < friendsTable.getRowCount(); ++i) {
            CheckBox checkBox = (CheckBox) friendsTable.getWidget(i, 0);
            if (checkBox.getValue()) {
                selectedRows.add(i);
            }
        }

        return selectedRows;
    }

    @Override
    public void setData(List<String> data) {
        displayFriends(data);
    }

    public void showLoadingMessage() {
    }

}