com.apress.progwt.client.widget.datepicker.CalendarTraversalPanel.java Source code

Introduction

Here is the source code for com.apress.progwt.client.widget.datepicker.CalendarTraversalPanel.java

Source

/*
 * Copyright 2008 Jeff Dwyer
 * 
 * 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.
 */
/*
 * Simple Date Picker Widget for GWT library of Google, Inc.
 * 
 * Copyright (c) 2006 Parvinder Thapar
 * http://psthapar.googlepages.com/
 * 
 * This library is free software; you can redistribute 
 * it and/or modify it under the terms of the GNU Lesser 
 * General Public License as published by the Free Software 
 * Foundation; either version 2.1 of the License, or 
 * (at your option) any later version. This library is 
 * distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY  or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNULesser General Public License for more details. 
 * You should have received a copy of the GNU Lesser General 
 * PublicLicense along with this library; if not, write to the 
 * Free Software Foundation, Inc.,  
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA  
 */

package com.apress.progwt.client.widget.datepicker;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.DockPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Widget;

/*
 * CalendarTraversalPanel extends Dock Panel and comprises of
 * buttons which allow the users to traverse month and year in 
 * the calendar. It also shows the current month and year
 */
public class CalendarTraversalPanel extends DockPanel implements ClickListener {

    HTML monthYearDesc = new HTML();
    //Button prevMonth = new Button("  <  ", this);
    Button prevMonth = new Button("<", this);
    Button prevYear = new Button("<<", this);
    Button nextYear = new Button(">>", this);
    Button nextMonth = new Button(">", this);

    DatePicker datePicker = null;

    /*
     * Constrcutor
     * 
     * @param DatePicker
     */
    public CalendarTraversalPanel(DatePicker datePicker) {
        this.datePicker = datePicker;
        init();
    }

    /*
     * init
     * 
     * Does the initialization of the panel along with its
     * children widgets
     */
    private void init() {
        this.setHeight(18 + "px");
        drawTitle();

        this.prevMonth.setWidth(23 + "px");
        this.nextMonth.setWidth(23 + "px");

        DOM.setAttribute(prevMonth.getElement(), "title", "Previous Month");
        DOM.setAttribute(prevYear.getElement(), "title", "Previous Year");
        DOM.setAttribute(nextMonth.getElement(), "title", "Next Month");
        DOM.setAttribute(nextYear.getElement(), "title", "Next Year");

        HorizontalPanel prevButtons = new HorizontalPanel();
        prevMonth.setStyleName("monthYearTraversorBtn");
        prevYear.setStyleName("monthYearTraversorBtn");
        prevButtons.add(prevYear);
        prevButtons.add(prevMonth);

        HorizontalPanel nextButtons = new HorizontalPanel();
        nextMonth.setStyleName("monthYearTraversorBtn");
        nextYear.setStyleName("monthYearTraversorBtn");
        nextButtons.add(nextMonth);
        nextButtons.add(nextYear);

        this.add(prevButtons, DockPanel.WEST);
        this.setCellHorizontalAlignment(prevButtons, DockPanel.ALIGN_LEFT);
        this.add(nextButtons, DockPanel.EAST);
        this.setCellHorizontalAlignment(nextButtons, DockPanel.ALIGN_RIGHT);
        this.add(monthYearDesc, DockPanel.CENTER);
        this.setVerticalAlignment(DockPanel.ALIGN_MIDDLE);
        this.setCellHorizontalAlignment(this.monthYearDesc, HasAlignment.ALIGN_CENTER);
        this.setCellVerticalAlignment(this.monthYearDesc, HasAlignment.ALIGN_MIDDLE);
        this.setCellWidth(monthYearDesc, "100%");
        monthYearDesc.setStyleName("monthYearTraversor");

        this.setStyleName("monthYearTraversor");
    }

    /*
     * drawTitle
     * 
     * Displays the current month and year
     */
    void drawTitle() {
        redrawTitle();
    }

    /*
     * redrawTitle
     * 
     * Displays the new month and year when the user traverses
     * the month or year
     */
    private void redrawTitle() {
        StringBuffer monthYearTitle = new StringBuffer();
        monthYearTitle.append(DateUtil.getMonth(this.datePicker.getCurrentDate()));
        monthYearTitle.append("-");
        monthYearTitle.append(this.datePicker.getCurrentDate().getYear() + 1900);
        this.monthYearDesc.setText(monthYearTitle.toString());
    }

    /*
     * onClick
     * 
     * Method from ClickListener
     * Decribes what to do when the user clicks on the buttons
     * on the panel
     */
    public void onClick(Widget sender) {
        if (sender == prevMonth) {
            this.datePicker.setCurrentDate(DateUtil.addMonths(this.datePicker.getCurrentDate(), -1));
        } else if (sender == prevYear) {
            this.datePicker.setCurrentDate(DateUtil.addYears(this.datePicker.getCurrentDate(), -1));
        } else if (sender == nextYear) {
            this.datePicker.setCurrentDate(DateUtil.addYears(this.datePicker.getCurrentDate(), 1));
        } else if (sender == nextMonth) {
            this.datePicker.setCurrentDate(DateUtil.addMonths(this.datePicker.getCurrentDate(), 1));
        }
        this.redrawTitle();
        this.datePicker.redrawCalendar();
    }
}