Example usage for java.awt Canvas addMouseListener

Introduction

In this page you can find the example usage for java.awt Canvas addMouseListener.

Prototype

public synchronized void addMouseListener(MouseListener l) 

Source Link

Document

Adds the specified mouse listener to receive mouse events from this component.

Usage

From source file:SWT2D.java

private void run() {
    // Create top level shell
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Java 2D Example");
    // GridLayout for canvas and button
    shell.setLayout(new GridLayout());
    // Create container for AWT canvas
    final Composite canvasComp = new Composite(shell, SWT.EMBEDDED);
    // Set preferred size
    GridData data = new GridData();
    data.widthHint = 600;//from www  .j a v a 2 s. c  om
    data.heightHint = 500;
    canvasComp.setLayoutData(data);
    // Create AWT Frame for Canvas
    java.awt.Frame canvasFrame = SWT_AWT.new_Frame(canvasComp);
    // Create Canvas and add it to the Frame
    final java.awt.Canvas canvas = new java.awt.Canvas();
    canvasFrame.add(canvas);
    // Get graphical context and cast to Java2D
    final java.awt.Graphics2D g2d = (java.awt.Graphics2D) canvas.getGraphics();
    // Enable antialiasing
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    // Remember initial transform
    final java.awt.geom.AffineTransform origTransform = g2d.getTransform();
    // Create Clear button and position it
    Button clearButton = new Button(shell, SWT.PUSH);
    clearButton.setText("Clear");
    data = new GridData();
    data.horizontalAlignment = GridData.CENTER;
    clearButton.setLayoutData(data);
    // Event processing for Clear button
    clearButton.addSelectionListener(new SelectionAdapter() {
        public void widgetSelected(SelectionEvent e) {
            // Delete word list and redraw canvas
            wordList.clear();
            canvasComp.redraw();
        }
    });
    // Process canvas mouse clicks
    canvas.addMouseListener(new java.awt.event.MouseListener() {
        public void mouseClicked(java.awt.event.MouseEvent e) {
        }

        public void mouseEntered(java.awt.event.MouseEvent e) {
        }

        public void mouseExited(java.awt.event.MouseEvent e) {
        }

        public void mousePressed(java.awt.event.MouseEvent e) {
            // Manage pop-up editor
            display.syncExec(new Runnable() {
                public void run() {
                    if (eShell == null) {
                        // Create new Shell: non-modal!
                        eShell = new Shell(shell, SWT.NO_TRIM | SWT.MODELESS);
                        eShell.setLayout(new FillLayout());
                        // Text input field
                        eText = new Text(eShell, SWT.BORDER);
                        eText.setText("Text rotation in the SWT?");
                        eShell.pack();
                        // Set position (Display coordinates)
                        java.awt.Rectangle bounds = canvas.getBounds();
                        org.eclipse.swt.graphics.Point pos = canvasComp.toDisplay(bounds.width / 2,
                                bounds.height / 2);
                        Point size = eShell.getSize();
                        eShell.setBounds(pos.x, pos.y, size.x, size.y);
                        // Open Shell
                        eShell.open();
                    } else if (!eShell.isVisible()) {
                        // Editor versteckt, sichtbar machen
                        eShell.setVisible(true);
                    } else {
                        // Editor is visible - get text
                        String t = eText.getText();
                        // set editor invisible
                        eShell.setVisible(false);
                        // Add text to list and redraw canvas
                        wordList.add(t);
                        canvasComp.redraw();
                    }
                }
            });
        }

        public void mouseReleased(java.awt.event.MouseEvent e) {
        }
    });
    // Redraw the canvas
    canvasComp.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            // Pass the redraw task to AWT event queue
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    // Compute canvas center
                    java.awt.Rectangle bounds = canvas.getBounds();
                    int originX = bounds.width / 2;
                    int originY = bounds.height / 2;
                    // Reset canvas
                    g2d.setTransform(origTransform);
                    g2d.setColor(java.awt.Color.WHITE);
                    g2d.fillRect(0, 0, bounds.width, bounds.height);
                    // Set font
                    g2d.setFont(new java.awt.Font("Myriad", java.awt.Font.PLAIN, 32));
                    double angle = 0d;
                    // Prepare star shape
                    double increment = Math.toRadians(30);
                    Iterator iter = wordList.iterator();
                    while (iter.hasNext()) {
                        // Determine text colors in RGB color cycle
                        float red = (float) (0.5 + 0.5 * Math.sin(angle));
                        float green = (float) (0.5 + 0.5 * Math.sin(angle + Math.toRadians(120)));
                        float blue = (float) (0.5 + 0.5 * Math.sin(angle + Math.toRadians(240)));
                        g2d.setColor(new java.awt.Color(red, green, blue));
                        // Redraw text
                        String text = (String) iter.next();
                        g2d.drawString(text, originX + 50, originY);
                        // Rotate for next text output
                        g2d.rotate(increment, originX, originY);
                        angle += increment;
                    }
                }
            });
        }
    });
    // Finish shell and open it
    shell.pack();
    shell.open();
    // SWT event processing
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

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