grid.java

Java写的含有一个jdbc驱动的小型数据库数据库引擎

/*
 * Grid.java
 *
 * Copyright (c) 2001, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This package is based on HypersonicSQL, originally developed by Thomas Mueller.
 *
 */
package org.hsqldb.util;

import java.awt.*;
import java.util.Vector;

/**
 * Class declaration
 *
 *
 * @version 1.0.0.1
 */
public class Grid extends Panel {

    // drawing
    private Dimension   dMinimum;
    private Font	fFont;
    private FontMetrics fMetrics;
    private Graphics    gImage;
    private Image       iImage;

    // height / width
    private int		iWidth, iHeight;
    private int		iRowHeight, iFirstRow;
    private int		iGridWidth, iGridHeight;
    private int		iX, iY;

    // data
    private String      sColHead[];
    private Vector      vData;
    private int		iColWidth[];
    private int		iColCount, iRowCount;

    // scrolling
    private Scrollbar   sbHoriz, sbVert;
    private int		iSbWidth, iSbHeight;
    private boolean     bDrag;
    private int		iXDrag, iColDrag;

    /**
     * Constructor declaration
     *
     */
    public Grid() {
	super();

	fFont = new Font("Dialog", Font.PLAIN, 12);

	setLayout(null);

	sbHoriz = new Scrollbar(Scrollbar.HORIZONTAL);

	add(sbHoriz);

	sbVert = new Scrollbar(Scrollbar.VERTICAL);

	add(sbVert);
    }

    /**
     * Method declaration
     *
     *
     * @return
     */
    String[] getHead() {
	return sColHead;
    }

    /**
     * Method declaration
     *
     *
     * @return
     */
    Vector getData() {
	return vData;
    }

    /**
     * Method declaration
     *
     *
     * @param d
     */
    public void setMinimumSize(Dimension d) {
	dMinimum = d;
    }

    /**
     * Method declaration
     *
     *
     * @param x
     * @param y
     * @param w
     * @param h
     */
    public void reshape(int x, int y, int w, int h) {
	super.reshape(x, y, w, h);

	iSbHeight = sbHoriz.getPreferredSize().height;
	iSbWidth = sbVert.getPreferredSize().width;
	iHeight = h - iSbHeight;
	iWidth = w - iSbWidth;

	sbHoriz.reshape(0, iHeight, iWidth, iSbHeight);
	sbVert.reshape(iWidth, 0, iSbWidth, iHeight);
	adjustScroll();

	iImage = null;

	repaint();
    }

    /**
     * Method declaration
     *
     *
     * @param head
     */
    public void setHead(String head[]) {
	vData = new Vector();
	iColCount = head.length;
	sColHead = new String[iColCount];
	iColWidth = new int[iColCount];

	for (int i = 0; i < iColCount; i++) {
	    sColHead[i] = head[i];
	    iColWidth[i] = 100;
	}

	iRowCount = 0;
	iRowHeight = 0;
    }

    /**
     * Method declaration
     *
     *
     * @param data
     */
    public void addRow(String data[]) {
	if (data.length != iColCount) {
	    return;
	}

	String row[] = new String[iColCount];

	for (int i = 0; i < iColCount; i++) {
	    row[i] = data[i];
	}

	vData.addElement(row);

	iRowCount++;
    }

    /**
     * Method declaration
     *
     */
    public void update() {
	adjustScroll();
	repaint();
    }

    /**
     * Method declaration
     *
     */
    void adjustScroll() {
	if (iRowHeight == 0) {
	    return;
	}

	int w = 0;

	for (int i = 0; i < iColCount; i++) {
	    w += iColWidth[i];
	}

	iGridWidth = w;
	iGridHeight = iRowHeight * (iRowCount + 1);

	sbHoriz.setValues(iX, iWidth, 0, iGridWidth);

	int v = iY / iRowHeight, h = iHeight / iRowHeight;

	sbVert.setValues(v, h, 0, iRowCount + 1);

	iX = sbHoriz.getValue();
	iY = iRowHeight * sbVert.getValue();
    }

    /**
     * Method declaration
     *
     *
     * @param e
     *
     * @return
     */
    public boolean handleEvent(Event e) {
	switch (e.id) {

	case Event.SCROLL_LINE_UP:

	case Event.SCROLL_LINE_DOWN:

	case Event.SCROLL_PAGE_UP:

	case Event.SCROLL_PAGE_DOWN:

	case Event.SCROLL_ABSOLUTE:
	    iX = sbHoriz.getValue();
	    iY = iRowHeight * sbVert.getValue();

	    repaint();

	    return true;
	}

	return super.handleEvent(e);
    }

    /**
     * Method declaration
     *
     *
     * @param g
     */
    public void paint(Graphics g) {
	if (g == null) {
	    return;
	}

	if (iWidth <= 0 || iHeight <= 0) {
	    return;
	}

	g.setColor(SystemColor.control);
	g.fillRect(iWidth, iHeight, iSbWidth, iSbHeight);

	if (iImage == null) {
	    iImage = createImage(iWidth, iHeight);
	    gImage = iImage.getGraphics();

	    gImage.setFont(fFont);

	    if (fMetrics == null) {
		fMetrics = gImage.getFontMetrics();
	    }
	}

	if (iRowHeight == 0) {
	    iRowHeight = getMaxHeight(fMetrics);

	    for (int i = 0; i < iColCount; i++) {
		calcAutoWidth(i);
	    }

	    adjustScroll();
	}

	gImage.setColor(Color.white);
	gImage.fillRect(0, 0, iWidth, iHeight);
	gImage.setColor(Color.darkGray);
	gImage.drawLine(0, iRowHeight, iWidth, iRowHeight);

	int x = -iX;

	for (int i = 0; i < iColCount; i++) {
	    int w = iColWidth[i];

	    gImage.setColor(SystemColor.control);
	    gImage.fillRect(x + 1, 0, w - 2, iRowHeight);
	    gImage.setColor(Color.black);
	    gImage.drawString(sColHead[i], x + 2, iRowHeight - 5);
	    gImage.setColor(Color.darkGray);
	    gImage.drawLine(x + w - 1, 0, x + w - 1, iRowHeight - 1);
	    gImage.setColor(Color.white);
	    gImage.drawLine(x + w, 0, x + w, iRowHeight - 1);

	    x += w;
	}

	gImage.setColor(SystemColor.control);
	gImage.fillRect(0, 0, 1, iRowHeight);
	gImage.fillRect(x + 1, 0, iWidth - x, iRowHeight);
	gImage.drawLine(0, 0, 0, iRowHeight - 1);

	int y = iRowHeight + 1 - iY;
	int j = 0;

	while (y < iRowHeight + 1) {
	    j++;
	    y += iRowHeight;
	}

	iFirstRow = j;
	y = iRowHeight + 1;

	for (; y < iHeight && j < iRowCount; j++, y += iRowHeight) {
	    x = -iX;

	    for (int i = 0; i < iColCount; i++) {
		int   w = iColWidth[i];
		Color b = Color.white, t = Color.black;

		gImage.setColor(b);
		gImage.fillRect(x, y, w - 1, iRowHeight - 1);
		gImage.setColor(t);
		gImage.drawString(getDisplay(i, j), x + 2,
				  y + iRowHeight - 5);
		gImage.setColor(Color.lightGray);
		gImage.drawLine(x + w - 1, y, x + w - 1, y + iRowHeight - 1);
		gImage.drawLine(x, y + iRowHeight - 1, x + w - 1,
				y + iRowHeight - 1);

		x += w;
	    }

	    gImage.setColor(Color.white);
	    gImage.fillRect(x, y, iWidth - x, iRowHeight - 1);
	}

	g.drawImage(iImage, 0, 0, this);
    }

    /**
     * Method declaration
     *
     *
     * @param g
     */
    public void update(Graphics g) {
	paint(g);
    }

    /**
     * Method declaration
     *
     *
     * @param e
     * @param x
     * @param y
     *
     * @return
     */
    public boolean mouseMove(Event e, int x, int y) {
	if (y <= iRowHeight) {
	    int xb = x;

	    x += iX - iGridWidth;

	    int i = iColCount - 1;

	    for (; i >= 0; i--) {
		if (x > -7 && x < 7) {
		    break;
		}

		x += iColWidth[i];
	    }

	    if (i >= 0) {
		if (!bDrag) {
		    setCursor(new Cursor(Cursor.E_RESIZE_CURSOR));

		    bDrag = true;
		    iXDrag = xb - iColWidth[i];
		    iColDrag = i;
		}

		return true;
	    }
	}

	return mouseExit(e, x, y);
    }

    /**
     * Method declaration
     *
     *
     * @param e
     * @param x
     * @param y
     *
     * @return
     */
    public boolean mouseDrag(Event e, int x, int y) {
	if (bDrag && x < iWidth) {
	    int w = x - iXDrag;

	    if (w < 0) {
		w = 0;
	    }

	    iColWidth[iColDrag] = w;

	    adjustScroll();
	    repaint();
	}

	return true;
    }

    /**
     * Method declaration
     *
     *
     * @param e
     * @param x
     * @param y
     *
     * @return
     */
    public boolean mouseExit(Event e, int x, int y) {
	if (bDrag) {
	    setCursor(new Cursor(Cursor.DEFAULT_CURSOR));

	    bDrag = false;
	}

	return true;
    }

    /**
     * Method declaration
     *
     *
     * @return
     */
    public Dimension preferredSize() {
	return minimumSize();
    }

    /**
     * Method declaration
     *
     *
     * @return
     */
    public Dimension getPreferredSize() {
	return minimumSize();
    }

    /**
     * Method declaration
     *
     *
     * @return
     */
    public Dimension getMinimumSize() {
	return minimumSize();
    }

    /**
     * Method declaration
     *
     *
     * @return
     */
    public Dimension minimumSize() {
	return dMinimum;
    }

    /**
     * Method declaration
     *
     *
     * @param i
     */
    private void calcAutoWidth(int i) {
	int w = 10;

	w = Math.max(w, fMetrics.stringWidth(sColHead[i]));

	for (int j = 0; j < iRowCount; j++) {
	    String s[] = (String[]) (vData.elementAt(j));

	    w = Math.max(w, fMetrics.stringWidth(s[i]));
	}

	iColWidth[i] = w + 6;
    }

    /**
     * Method declaration
     *
     *
     * @param x
     * @param y
     *
     * @return
     */
    private String getDisplay(int x, int y) {
	return (((String[]) (vData.elementAt(y)))[x]);
    }

    /**
     * Method declaration
     *
     *
     * @param x
     * @param y
     *
     * @return
     */
    private String get(int x, int y) {
	return (((String[]) (vData.elementAt(y)))[x]);
    }

    /**
     * Method declaration
     *
     *
     * @param f
     *
     * @return
     */
    private static int getMaxHeight(FontMetrics f) {
	return f.getHeight() + 4;
    }

}