htmlmonthview.java

Rapla是一个灵活的多用户资源管理系统。它提供的一些功能有：日历GUI

/*--------------------------------------------------------------------------*
 | Copyright (C) 2006  Christopher Kohlhaas                                 |
 |                                                                          |
 | This program is free software; you can redistribute it and/or modify     |
 | it under the terms of the GNU General Public License as published by the |
 | Free Software Foundation. A copy of the license has been included with   |
 | these distribution in the COPYING file, if not go to www.fsf.org         |
 |                                                                          |
 | As a special exception, you are granted the permissions to link this     |
 | program with every library, which license fulfills the Open Source       |
 | Definition as published by the Open Source Initiative (OSI).             |
 *--------------------------------------------------------------------------*/

package org.rapla.components.calendarview.html;

import java.util.*;

import org.rapla.components.calendarview.Block;
import org.rapla.components.calendarview.Builder;

public class HTMLMonthView extends AbstractHTMLView {
    public final static int ROWS = 6; //without the header row
    public final static int COLUMNS = 7;
    /** shared calendar instance. Only used for temporary stored values. */
    int daysInMonth;
    HTMLSmallDaySlot[] slots;
    
    void calcMinMaxDates(Date date) {
        blockCalendar.setTime( date );
        blockCalendar.set(Calendar.DAY_OF_MONTH, 1);
        blockCalendar.set(Calendar.HOUR_OF_DAY,0);
        blockCalendar.set(Calendar.MINUTE,0);
        blockCalendar.set(Calendar.SECOND,0);
        blockCalendar.set(Calendar.MILLISECOND,0);
        this.startDate = blockCalendar.getTime();
        blockCalendar.set(Calendar.MILLISECOND,1);
        this.daysInMonth = blockCalendar.getActualMaximum( Calendar.DAY_OF_MONTH ) ; 
        blockCalendar.set(Calendar.MILLISECOND,0);
        blockCalendar.add(Calendar.DATE, this.daysInMonth);
        this.endDate = blockCalendar.getTime();
    }

    public Collection getBlocks() {
        ArrayList list = new ArrayList();
        for (int i=0;i<slots.length;i++) {
            list.addAll(slots[i]);
        }
        return Collections.unmodifiableCollection( list );
    }
    
    private boolean isExcluded(int column) {
        int weekDay = weekdayMapper.dayForIndex( column);
        if (excludeDays == null || !excludeDays.contains(new Integer(weekDay))) {
            return false;
        }
        // find first occurance of weekDay in month
        blockCalendar.setTime(startDate);
        blockCalendar.set(Calendar.DAY_OF_WEEK, weekDay);
        if (blockCalendar.get(Calendar.DATE) > 15) {
            blockCalendar.add(Calendar.DATE, 7);
        }
        int startField = blockCalendar.get(Calendar.DATE) -1;
        for ( int i=startField;i < slots.length;i+=7 ) {
            if (!slots[i].isEmpty() ) {
                return false;
            }
        }
        return true;
    }
    
    public void rebuild() {
        String[] headerNames = weekdayMapper.getNames();
        //      we need to clone the calendar, because we modify the calendar object int the getExclude() method 
        Calendar counter = (Calendar) blockCalendar.clone(); 
        
        // calculate the blocks
        Iterator it= builders.iterator();
        while (it.hasNext()) {
           Builder b= (Builder)it.next();
           b.prepareBuild(getStartDate(),getEndDate());
        }
        slots = new HTMLSmallDaySlot[ daysInMonth ];
        for (int i=0;i<slots.length;i++) {
            slots[i] = new HTMLSmallDaySlot(String.valueOf( i + 1));
        }
        
        it= builders.iterator();
        while (it.hasNext()) {
           Builder b= (Builder)it.next();
           if (b.isEnabled()) { b.build(this); }
        }
        counter.setTime(startDate);
        int lastRow = 0;
        HTMLSmallDaySlot[][] table = new HTMLSmallDaySlot[ROWS][COLUMNS];
        for (int i=0; i<daysInMonth; i++) {
            int weekday = counter.get(Calendar.DAY_OF_WEEK);
            int column = weekdayMapper.indexForDay( weekday );
            int row = (counter.get(Calendar.DATE) + 6 - column ) /  7;
            table[row][column] = slots[i];
            lastRow = row;
            slots[i].sort();
            counter.add(Calendar.DATE,1);
        }
        
        StringBuffer result = new StringBuffer();
        result.append("<table class=\"month_table\">\n");
        result.append("<tr>\n");
        for (int i=0;i<COLUMNS;i++) {
            if (isExcluded(i)) {
                continue;
            }
            result.append("<td class=\"month_header\" width=\"14%\">");
            result.append("<nobr>");
            result.append(headerNames[i]);
            result.append("</nobr>");
            result.append("</td>");
        }
        result.append("\n</tr>");
        
        for (int row=0; row<=lastRow; row++) {
            boolean excludeRow = true;
            // calculate if we can exclude the row
            for (int column = 0; column<COLUMNS; column ++) {
                if ( table[row][column] != null && !isExcluded( column )) {
                    excludeRow = false;
                }
            }
            if ( excludeRow )
                continue;
            result.append("<tr>\n");
            for (int column = 0; column<COLUMNS; column ++) {
                if ( isExcluded( column )) {
                    continue;
                }
                HTMLSmallDaySlot slot = table[row][column];
                if ( slot == null ) {
                    result.append("<td class=\"month_cell\" height=\"40\"></td>\n");
                } else {
                    result.append("<td class=\"month_cell\" valign=\"top\" height=\"40\">\n");
                    slot.paint( result );
                    result.append("</td>\n");
                }
            }
            result.append("</tr>\n");
        }
        result.append("</table>");
        m_html = result.toString();
    }

    public void addBlock(Block block,int slot) {
        checkBlock( block );
        blockCalendar.setTime(block.getStart());
        int day = blockCalendar.get(Calendar.DATE);
        slots[day-1].putBlock( block );
    }
}