Example usage for org.eclipse.swt.widgets Display asyncExec

Introduction

In this page you can find the example usage for org.eclipse.swt.widgets Display asyncExec.

Prototype

public void asyncExec(Runnable runnable) 

Source Link

Document

Causes the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity.

Usage

From source file:BrowserExample.java

/**
 * Creates an instance of a ControlExample embedded inside the supplied
 * parent Composite./* w w w .  ja v a  2 s .  c  om*/
 * 
 * @param parent
 *            the container of the example
 */
public BrowserExample(Composite parent) {

    final Display display = parent.getDisplay();
    FormLayout layout = new FormLayout();
    parent.setLayout(layout);
    ToolBar toolbar = new ToolBar(parent, SWT.NONE);
    final ToolItem itemBack = new ToolItem(toolbar, SWT.PUSH);
    itemBack.setText(getResourceString("Back"));
    final ToolItem itemForward = new ToolItem(toolbar, SWT.PUSH);
    itemForward.setText(getResourceString("Forward"));
    final ToolItem itemStop = new ToolItem(toolbar, SWT.PUSH);
    itemStop.setText(getResourceString("Stop"));
    final ToolItem itemRefresh = new ToolItem(toolbar, SWT.PUSH);
    itemRefresh.setText(getResourceString("Refresh"));
    final ToolItem itemGo = new ToolItem(toolbar, SWT.PUSH);
    itemGo.setText(getResourceString("Go"));

    location = new Text(parent, SWT.BORDER);

    images = new Image[] { new Image(display, "java2s.gif") };

    final Canvas canvas = new Canvas(parent, SWT.NO_BACKGROUND);
    final Rectangle rect = images[0].getBounds();
    canvas.addListener(SWT.Paint, new Listener() {
        public void handleEvent(Event e) {
            Point pt = canvas.getSize();
            e.gc.drawImage(images[index], 0, 0, rect.width, rect.height, 0, 0, pt.x, pt.y);
        }
    });
    canvas.addListener(SWT.MouseDown, new Listener() {
        public void handleEvent(Event e) {
            browser.setUrl(getResourceString("Startup"));
        }
    });

    display.asyncExec(new Runnable() {
        public void run() {
            if (canvas.isDisposed())
                return;
            if (busy) {
                index++;
                if (index == images.length)
                    index = 0;
                canvas.redraw();
            }
            display.timerExec(150, this);
        }
    });

    final Label status = new Label(parent, SWT.NONE);
    final ProgressBar progressBar = new ProgressBar(parent, SWT.NONE);

    FormData data = new FormData();
    data.top = new FormAttachment(0, 5);
    toolbar.setLayoutData(data);

    data = new FormData();
    data.left = new FormAttachment(0, 0);
    data.right = new FormAttachment(100, 0);
    data.top = new FormAttachment(canvas, 5, SWT.DEFAULT);
    data.bottom = new FormAttachment(status, -5, SWT.DEFAULT);
    try {
        browser = new Browser(parent, SWT.NONE);
        browser.setLayoutData(data);
    } catch (SWTError e) {
        /* Browser widget could not be instantiated */
        Label label = new Label(parent, SWT.CENTER | SWT.WRAP);
        label.setText(getResourceString("BrowserNotCreated"));
        label.setLayoutData(data);
    }

    data = new FormData();
    data.width = 24;
    data.height = 24;
    data.top = new FormAttachment(0, 5);
    data.right = new FormAttachment(100, -5);
    canvas.setLayoutData(data);

    data = new FormData();
    data.top = new FormAttachment(toolbar, 0, SWT.TOP);
    data.left = new FormAttachment(toolbar, 5, SWT.RIGHT);
    data.right = new FormAttachment(canvas, -5, SWT.DEFAULT);
    location.setLayoutData(data);

    data = new FormData();
    data.left = new FormAttachment(0, 5);
    data.right = new FormAttachment(progressBar, 0, SWT.DEFAULT);
    data.bottom = new FormAttachment(100, -5);
    status.setLayoutData(data);

    data = new FormData();
    data.right = new FormAttachment(100, -5);
    data.bottom = new FormAttachment(100, -5);
    progressBar.setLayoutData(data);

    if (browser != null) {
        itemBack.setEnabled(browser.isBackEnabled());
        itemForward.setEnabled(browser.isForwardEnabled());

        Listener listener = new Listener() {
            public void handleEvent(Event event) {
                ToolItem item = (ToolItem) event.widget;
                if (item == itemBack)
                    browser.back();
                else if (item == itemForward)
                    browser.forward();
                else if (item == itemStop)
                    browser.stop();
                else if (item == itemRefresh)
                    browser.refresh();
                else if (item == itemGo)
                    browser.setUrl(location.getText());
            }
        };
        browser.addLocationListener(new LocationListener() {
            public void changed(LocationEvent event) {
                busy = true;
                if (event.top)
                    location.setText(event.location);
            }

            public void changing(LocationEvent event) {
            }
        });
        browser.addProgressListener(new ProgressListener() {
            public void changed(ProgressEvent event) {
                if (event.total == 0)
                    return;
                int ratio = event.current * 100 / event.total;
                progressBar.setSelection(ratio);
                busy = event.current != event.total;
                if (!busy) {
                    index = 0;
                    canvas.redraw();
                }
            }

            public void completed(ProgressEvent event) {
                itemBack.setEnabled(browser.isBackEnabled());
                itemForward.setEnabled(browser.isForwardEnabled());
                progressBar.setSelection(0);
                busy = false;
                index = 0;
                canvas.redraw();
            }
        });
        browser.addStatusTextListener(new StatusTextListener() {
            public void changed(StatusTextEvent event) {
                status.setText(event.text);
            }
        });
        if (parent instanceof Shell) {
            final Shell shell = (Shell) parent;
            browser.addTitleListener(new TitleListener() {
                public void changed(TitleEvent event) {
                    shell.setText(event.title + " - " + getResourceString("window.title"));
                }
            });
        }
        itemBack.addListener(SWT.Selection, listener);
        itemForward.addListener(SWT.Selection, listener);
        itemStop.addListener(SWT.Selection, listener);
        itemRefresh.addListener(SWT.Selection, listener);
        itemGo.addListener(SWT.Selection, listener);
        location.addListener(SWT.DefaultSelection, new Listener() {
            public void handleEvent(Event e) {
                browser.setUrl(location.getText());
            }
        });

        initialize(display, browser);
        browser.setUrl(getResourceString("Startup"));
    }
}

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