windowscalendarpanelui.java

一个java开发平台中实现的日期时间控件

/*
*   Copyright (c) 2000 Martin Newstead ([e-mail]).  All Rights Reserved.
*
*   The author makes no representations or warranties about the suitability of the
*   software, either express or implied, including but not limited to the
*   implied warranties of merchantability, fitness for a particular
*   purpose, or non-infringement. The author shall not be liable for any damages
*   suffered by licensee as a result of using, modifying or distributing
*   this software or its derivatives.
*
*   The author requests that he be notified of any application, applet, or other binary that
*   makes use of this code and that some acknowedgement is given. Comments, questions and
*   requests for change will be welcomed.
*/
package mseries.plaf.Windows;

import javax.swing.plaf.*;
import javax.swing.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;

import mseries.Calendar.CalendarPanel;

/**
*    The Windows Look and Feel UIDelagate for CalendarPanel
*
*    A Look and Feel delegate for the CalenderPanel. This version renders the
*    selected date with a raised border and dashed focus indicator. TAB moves
*    around the calendar, Shift-Tab jumps out to the next component. The arrow
*    keys move around the panel stopping (i.e. not rolling over) at the ends.
*/
public class WindowsCalendarPanelUI extends mseries.plaf.basic.BasicCalendarPanelUI
{
    /**
    *    This method is called by the UIManager to get an instance of
    *    this class and must be overridden in subclasses.
    */
    public static ComponentUI createUI(JComponent x)
    {
        return new WindowsCalendarPanelUI();
    }

    /*
    *    This is where we would draw/remove borders, focus highlights,
    *    colours etc. Override this method in a subclass to render the
    *    selected date.
    */
    protected void drawSelectedEffect(Graphics g, boolean selected)
    {
        int strWidth=0;
        int strHeight=0;
        int x,y;
        int width, height;

        width = getCellSize().width;
        height = getCellSize().height;
        FontMetrics fm;

        if(isOpaque())
        {
            g.setColor(background);
            g.fillRect(0,0,width, height);
        }


        if (selected)
        {
            // Draw Raised Border TOP-LEFT
            g.setColor(SystemColor.controlLtHighlight);
            g.drawLine(0, 0, width-1, 0);
            g.drawLine(0, 0, 0, height-1);

            // BOTTOM-RIGHT
            g.setColor(SystemColor.controlDkShadow);
            g.drawLine(0, height-1, width-1, height-1);
            g.drawLine(width-1, height-1, width-1, 0);
        }

    }

    /**
    *    Draws the dashed rectangle around the number in the cell which is selected
    *    when the calendar panel has focus. Over ride this method in a subclass
    *    to change the appearance.
    *    @see #drawDashedRect
    */
    protected void drawFocusedEffect(Graphics g, boolean focused, boolean selected)
    {
        int width, height;

        width = getCellSize().width;
        height = getCellSize().height;
        if (focused)
        {
            g.setColor(foreground);
            drawDashedRect(g, 3, 2, width-5, height-5);
        }

    }

    /**
    *   Draws a dashed rectangle in the selected date.
    */
    public static void drawDashedRect(Graphics g,int x,int y,int width,int height)
    {
        int vx,vy;

        // draw upper and lower horizontal dashes
        for (vx = x; vx < (x + width); vx+=2) {
            g.drawLine(vx, y, vx, y);
            g.drawLine(vx, y + height-1, vx, y + height-1);
        }

        // draw left and right vertical dashes
        for (vy = y; vy < (y + height); vy+=2) {
            g.drawLine(x, vy, x, vy);
            g.drawLine(x+width-1, vy, x + width-1, vy);
        }
    }
}