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Die Anleitung zu Java SWT ProgressBar

  1. SWT ProgressBar
  2. Zum Beispiel: SWT ProgressBar
  3. ProgressBar und Thread

1. SWT ProgressBar

ProgressBar bezeichnet die Progress einer Task in der Applikation SWT.
Das folgende Bild stellt 3 ProgressBar vor. 2 erste ProgressBar bezeichnet einen Task mit der bestimmten Volume . das lezte ProgressBar bezeichnet den Progress eines Task mit der unbestimmten Endpunkt
Das vertikale ProgressBar
Das sind die Style, die für ProgressBar angewendet werden können
  • SMOOTH
  • HORIZONTAL
  • VERTICAL
  • INDETERMINATE
// Horizontal ProgressBar
ProgressBar progressBar1 = new ProgressBar(shell, SWT.NULL);
ProgressBar progressBar2 = new ProgressBar(shell, SWT.SMOOTH);
ProgressBar progressBar3 = new ProgressBar(shell, SWT.INDETERMINATE);

// Vertical ProgressBar
ProgressBar progressBar4 = new ProgressBar(shell, SWT.VERTICAL | SWT.SMOOTH);

2. Zum Beispiel: SWT ProgressBar

Zum Beispiel: das ProgressBar mit den verschiedenen Style erstellen
ProgressDemo.java
package org.o7planning.swt.progressbar;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;

public class ProgressBarDemo {
    public ProgressBarDemo() {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("SWT ProgressBar (o7planning.org)");
        shell.setSize(450, 200);

        ProgressBar progressBar1 = new ProgressBar(shell, SWT.NULL);
        ProgressBar progressBar2 = new ProgressBar(shell, SWT.SMOOTH);
        ProgressBar progressBar3 = new ProgressBar(shell, SWT.INDETERMINATE);

        progressBar1.setMinimum(30);
        progressBar1.setMaximum(250);
        progressBar1.setSelection(160);
        
        progressBar2.setMinimum(30);
        progressBar2.setMaximum(250);
        progressBar2.setSelection(200);        

        progressBar1.setBounds(140, 10, 200, 20);
        progressBar2.setBounds(140, 40, 200, 20);
        progressBar3.setBounds(140, 70, 200, 20);

        Label label1 = new Label(shell, SWT.NULL);
        label1.setText("(default)");
        Label label2 = new Label(shell, SWT.NULL);
        label2.setText("SWT.SMOOTH");
        Label label3 = new Label(shell, SWT.NULL);
        label3.setText("SWT.INDETERMINATE");

        label1.setAlignment(SWT.RIGHT);
        label2.setAlignment(SWT.RIGHT);
        label3.setAlignment(SWT.RIGHT);

        label1.setBounds(10, 10, 120, 20);
        label2.setBounds(10, 40, 120, 20);
        label3.setBounds(10, 70, 120, 20);

        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }
    public static void main(String[] args) {
        new ProgressBarDemo();
    }
}

3. ProgressBar und Thread

Sie können einen Thread erstellen um eine Task durchzuführen, wie die File kopieren. Die Kopie Task kostet die Zeit und Sie sollen die ProgressBar benutzen um die Prozent der erledigten Task darzustellen.
ProgressBarCopyDemo.java
package org.o7planning.swt.progressbar;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;

public class ProgressBarCopyDemo {
    private CopyThread copyThread = null;
    public ProgressBarCopyDemo() {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("SWT ProgressBar (o7planning.org)");
        shell.setSize(450, 200);
        shell.setLayout(null);

        ProgressBar progressBar = new ProgressBar(shell, SWT.NONE);
        progressBar.setBounds(10, 23, 350, 17);

        Label labelInfo = new Label(shell, SWT.NONE);
        labelInfo.setBounds(10, 46, 350, 15);
        labelInfo.setText(" ...");

        // Button Copy
        Button buttonCopy = new Button(shell, SWT.NONE);
        buttonCopy.setBounds(122, 67, 75, 25);
        buttonCopy.setText("Copy");
        // Button Cancel
        Button buttonCancel = new Button(shell, SWT.NONE);
        buttonCancel.setBounds(200, 67, 75, 25);
        buttonCancel.setText("Cancel");
        buttonCancel.setEnabled(false);

        buttonCopy.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                copyThread = new CopyThread(display, progressBar, labelInfo, buttonCopy, buttonCancel);
                copyThread.start();
            }
        });
        buttonCancel.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                if (copyThread != null) {
                    copyThread.cancel();
                }
            }
        });
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }
    public static void main(String[] args) {
        new ProgressBarCopyDemo();
    }
}
CopyThread.java
package org.o7planning.swt.progressbar;

import java.io.File;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.ProgressBar;

public class CopyThread extends Thread {
    private Display display;
    private ProgressBar progressBar;
    private Button buttonCopy;
    private Button buttonCancel;
    private Label labelInfo;
    private boolean cancel;

    public CopyThread(Display display, ProgressBar progressBar, //
            Label labelInfo, Button buttonCopy, Button buttonCancel) {
        this.display = display;
        this.progressBar = progressBar;
        this.buttonCopy = buttonCopy;
        this.buttonCancel = buttonCancel;
        this.labelInfo = labelInfo;
    }
    @Override
    public void run() {
        if (display.isDisposed()) {
            return;
        }
        this.updateGUIWhenStart();

        // Copy All file In C:/Windows
        File dir = new File("C:/Windows");
        File[] files = dir.listFiles();
        int count = files.length;

        int i = 0;
        for (File file : files) {
            if (cancel) {
                break;
            }
            i++;
            if (file.isFile()) {
                this.copy(file);
            } else {
                continue;
            }
            this.updateGUIInProgress(file, i, count);
        }
        this.updateGUIWhenFinish();
    }
    private void copy(File file) {
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
        }
    }
    private void updateGUIWhenStart() {
        display.asyncExec(new Runnable() {
            @Override
            public void run() {
                buttonCopy.setEnabled(false);
                buttonCancel.setEnabled(true);
            }
        });
    }
    private void updateGUIWhenFinish() {
        display.asyncExec(new Runnable() {
            @Override
            public void run() {
                buttonCopy.setEnabled(true);
                buttonCancel.setEnabled(false);
                progressBar.setSelection(0);
                progressBar.setMaximum(1);
                if (cancel) {
                    labelInfo.setText("Cancelled!");
                } else {
                    labelInfo.setText("Finished!");
                }
            }
        });
    }
    private void updateGUIInProgress(File file, int value, int count) {
        display.asyncExec(new Runnable() {
            @Override
            public void run() {
                labelInfo.setText("Copying file: " + file.getAbsolutePath());
                progressBar.setMaximum(count);
                progressBar.setSelection(value);
            }
        });
    }
    public void cancel() {
        this.cancel = true;
    }
}

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