ProcessDialog.java

/**
 * 
 */
package jframe.swt.ui;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Dialog;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;

/**
 * @author dzh
 * @date Dec 27, 2013 2:07:03 PM
 * @since 1.0
 */
public class ProcessDialog extends Dialog {

    private ProgressBar progressBar;
    private Shell shell;
    private String initText = "";

    /**
     * @param parent
     */
    public ProcessDialog(Shell parent) {
        super(parent, SWT.SMOOTH);
    }

    public ProcessDialog(Shell parent, int style) {
        super(parent, style);
        checkSubclass();
    }

    /**
     * APPLICATION_MODAL, PRIMARY_MODAL, SYSTEM_MODAL, SHEET
     * 
     * @param style
     */
    public void open() {
        Shell parent = getParent();
        shell = new Shell(parent, SWT.APPLICATION_MODAL);
        shell.setSize(200, 30); // TODO 根据文字判断合适的大小
        shell.setBackgroundMode(SWT.INHERIT_FORCE);
        shell.setLayout(new FillLayout());
        Rectangle bounds = parent.getDisplay().getPrimaryMonitor().getBounds();
        Rectangle rect = shell.getBounds();
        int x = bounds.x + (bounds.width - rect.width) / 2;
        int y = bounds.y + (bounds.height - rect.height) / 2;
        shell.setLocation(x, y);

        progressBar = new ProgressBar(shell, getStyle());
        progressBar.setMinimum(0);
        progressBar.setMaximum(100);
        progressBar.addPaintListener(new PaintListener() {
            public void paintControl(PaintEvent e) {
                // String string = initText
                // + (progressBar.getSelection()
                // * 1.0
                // / (progressBar.getMaximum() - progressBar
                // .getMinimum()) * 100) + "%";
                String string = initText + " " + progressBar.getSelection() + "%";
                Point point = progressBar.getSize();

                FontMetrics fontMetrics = e.gc.getFontMetrics();
                // int width = fontMetrics.getAverageCharWidth() *
                // string.length();
                int width = e.gc.stringExtent(string).x;
                int height = fontMetrics.getHeight();
                e.gc.setForeground(shell.getDisplay().getSystemColor(SWT.COLOR_DARK_GRAY));
                e.gc.drawString(string, (point.x - width) / 2, (point.y - height) / 2, true);
            }
        });

        shell.open();
    }

    // public void setMaximum(int value) {
    // progressBar.setMaximum(value);
    // }
    // public void setMinimum(int value) {
    // progressBar.setMinimum(value);
    // }

    public void setSelection(int value) {
        progressBar.setSelection(value);
    }

    public void setText(String text) {
        this.initText = text;
    }

    public int getSelection() {
        return progressBar.getSelection();
    }

    public void setState(int state) {
        progressBar.setState(state);
    }

    public void close() {
        shell.setVisible(false);
        if (!shell.isDisposed())
            shell.close();
        if (!getParent().isDisposed()) {
            getParent().setActive();
        }
    }

}