List of usage examples for org.eclipse.swt.widgets Canvas setData
@Override
public void setData(String key, Object value)
From source file:DoubleBuffer.java
public DoubleBuffer() { shell.setLayout(new FillLayout()); final Image imageEclipse = new Image(display, "java2s.gif"); // final Canvas canvas = new Canvas(shell, SWT.NULL); // canvas.addPaintListener(new PaintListener() { // public void paintControl(PaintEvent e) { // Point size = canvas.getSize(); ///*from www . ja va 2 s. c om*/ // int x1 = (int) (Math.random() * size.x); // int y1 = (int) (Math.random() * size.y); // int x2 = Math.max(canvas.getBounds().width - x1 - 10, 50); // int y2 = Math.max(canvas.getBounds().height - y1 - 10, 50); // // // e.gc.drawRoundRectangle(x1, y1, x2, y2, 5, 5); // // display.timerExec(100, new Runnable() { // public void run() { // canvas.redraw(); // } // }); // // } // }); final Canvas doubleBufferedCanvas = new Canvas(shell, SWT.NO_BACKGROUND); doubleBufferedCanvas.addPaintListener(new PaintListener() { public void paintControl(PaintEvent e) { // Creates new image only absolutely necessary. Image image = (Image) doubleBufferedCanvas.getData("double-buffer-image"); if (image == null || image.getBounds().width != doubleBufferedCanvas.getSize().x || image.getBounds().height != doubleBufferedCanvas.getSize().y) { image = new Image(display, doubleBufferedCanvas.getSize().x, doubleBufferedCanvas.getSize().y); doubleBufferedCanvas.setData("double-buffer-image", image); } // Initializes the graphics context of the image. GC imageGC = new GC(image); imageGC.setBackground(e.gc.getBackground()); imageGC.setForeground(e.gc.getForeground()); imageGC.setFont(e.gc.getFont()); // Fills background. Rectangle imageSize = image.getBounds(); imageGC.fillRectangle(0, 0, imageSize.width + 1, imageSize.height + 1); // Performs actual drawing here ... Point size = doubleBufferedCanvas.getSize(); int x1 = (int) (Math.random() * size.x); int y1 = (int) (Math.random() * size.y); int x2 = Math.max(doubleBufferedCanvas.getBounds().width - x1 - 10, 50); int y2 = Math.max(doubleBufferedCanvas.getBounds().height - y1 - 10, 50); imageGC.drawRoundRectangle(x1, y1, x2, y2, 5, 5); // Draws the buffer image onto the canvas. e.gc.drawImage(image, 0, 0); imageGC.dispose(); display.timerExec(100, new Runnable() { public void run() { doubleBufferedCanvas.redraw(); } }); } }); shell.setSize(300, 200); shell.open(); //textUser.forceFocus(); // Set up the event loop. while (!shell.isDisposed()) { if (!display.readAndDispatch()) { // If no more entries in event queue display.sleep(); } } display.dispose(); }
From source file:DNDExample.java
private Control createWidget(int type, Composite parent, String prefix) { switch (type) { case BUTTON_CHECK: { Button button = new Button(parent, SWT.CHECK); button.setText(prefix + " Check box"); return button; }// w w w.j av a2 s .c om case BUTTON_TOGGLE: { Button button = new Button(parent, SWT.TOGGLE); button.setText(prefix + " Toggle button"); return button; } case BUTTON_RADIO: { Button button = new Button(parent, SWT.RADIO); button.setText(prefix + " Radio button"); return button; } case TABLE: { Table table = new Table(parent, SWT.BORDER | SWT.MULTI); TableColumn column1 = new TableColumn(table, SWT.NONE); TableColumn column2 = new TableColumn(table, SWT.NONE); for (int i = 0; i < 10; i++) { TableItem item = new TableItem(table, SWT.NONE); item.setText(0, prefix + " name " + i); item.setText(1, prefix + " value " + i); } column1.pack(); column2.pack(); return table; } case TEXT: { Text text = new Text(parent, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL); text.setText(prefix + " Text"); return text; } case TREE: { Tree tree = new Tree(parent, SWT.BORDER); for (int i = 0; i < 3; i++) { TreeItem item = new TreeItem(tree, SWT.NONE); item.setText(prefix + " item " + i); for (int j = 0; j < 3; j++) { TreeItem subItem = new TreeItem(item, SWT.NONE); subItem.setText(prefix + " item " + j); for (int k = 0; k < 3; k++) { TreeItem subsubItem = new TreeItem(subItem, SWT.NONE); subsubItem.setText(prefix + " item " + k); } } } return tree; } case CANVAS: { Canvas canvas = new Canvas(parent, SWT.BORDER); canvas.setData("STRINGS", new String[] { prefix + " Canvas widget" }); canvas.addPaintListener(new PaintListener() { public void paintControl(PaintEvent e) { Canvas c = (Canvas) e.widget; Image image = (Image) c.getData("IMAGE"); if (image != null) { e.gc.drawImage(image, 5, 5); } else { String[] strings = (String[]) c.getData("STRINGS"); if (strings != null) { FontMetrics metrics = e.gc.getFontMetrics(); int height = metrics.getHeight(); int y = 5; for (int i = 0; i < strings.length; i++) { e.gc.drawString(strings[i], 5, y); y += height + 5; } } } } }); return canvas; } case LABEL: { Label label = new Label(parent, SWT.BORDER); label.setText(prefix + " Label"); return label; } case LIST: { List list = new List(parent, SWT.BORDER); list.setItems(new String[] { prefix + " Item a", prefix + " Item b", prefix + " Item c", prefix + " Item d" }); return list; } default: throw new SWTError(SWT.ERROR_NOT_IMPLEMENTED); } }
From source file:org.eclipse.swt.examples.dnd.DNDExample.java
private Control createWidget(int type, Composite parent, String prefix) { switch (type) { case BUTTON_CHECK: { Button button = new Button(parent, SWT.CHECK); button.setText(prefix + " Check box"); return button; }//from w w w . ja v a 2 s. com case BUTTON_TOGGLE: { Button button = new Button(parent, SWT.TOGGLE); button.setText(prefix + " Toggle button"); return button; } case BUTTON_RADIO: { Button button = new Button(parent, SWT.RADIO); button.setText(prefix + " Radio button"); return button; } case STYLED_TEXT: { StyledText text = new StyledText(parent, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL); text.setText(prefix + " Styled Text"); return text; } case TABLE: { Table table = new Table(parent, SWT.BORDER | SWT.MULTI); table.setHeaderVisible(true); TableColumn column0 = new TableColumn(table, SWT.LEFT); column0.setText("Name"); TableColumn column1 = new TableColumn(table, SWT.RIGHT); column1.setText("Value"); TableColumn column2 = new TableColumn(table, SWT.CENTER); column2.setText("Description"); for (int i = 0; i < 10; i++) { TableItem item = new TableItem(table, SWT.NONE); item.setText(0, prefix + " name " + i); item.setText(1, prefix + " value " + i); item.setText(2, prefix + " description " + i); item.setImage(itemImage); } column0.pack(); column1.pack(); column2.pack(); return table; } case TEXT: { Text text = new Text(parent, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL); text.setText(prefix + " Text"); return text; } case TREE: { Tree tree = new Tree(parent, SWT.BORDER | SWT.MULTI); tree.setHeaderVisible(true); TreeColumn column0 = new TreeColumn(tree, SWT.LEFT); column0.setText("Name"); TreeColumn column1 = new TreeColumn(tree, SWT.RIGHT); column1.setText("Value"); TreeColumn column2 = new TreeColumn(tree, SWT.CENTER); column2.setText("Description"); for (int i = 0; i < 3; i++) { TreeItem item = new TreeItem(tree, SWT.NONE); item.setText(0, prefix + " name " + i); item.setText(1, prefix + " value " + i); item.setText(2, prefix + " description " + i); item.setImage(itemImage); for (int j = 0; j < 3; j++) { TreeItem subItem = new TreeItem(item, SWT.NONE); subItem.setText(0, prefix + " name " + i + " " + j); subItem.setText(1, prefix + " value " + i + " " + j); subItem.setText(2, prefix + " description " + i + " " + j); subItem.setImage(itemImage); for (int k = 0; k < 3; k++) { TreeItem subsubItem = new TreeItem(subItem, SWT.NONE); subsubItem.setText(0, prefix + " name " + i + " " + j + " " + k); subsubItem.setText(1, prefix + " value " + i + " " + j + " " + k); subsubItem.setText(2, prefix + " description " + i + " " + j + " " + k); subsubItem.setImage(itemImage); } } } column0.pack(); column1.pack(); column2.pack(); return tree; } case CANVAS: { Canvas canvas = new Canvas(parent, SWT.BORDER); canvas.setData("STRINGS", new String[] { prefix + " Canvas widget" }); canvas.addPaintListener(e -> { Canvas c = (Canvas) e.widget; Image image = (Image) c.getData("IMAGE"); if (image != null) { e.gc.drawImage(image, 5, 5); } else { String[] strings = (String[]) c.getData("STRINGS"); if (strings != null) { FontMetrics metrics = e.gc.getFontMetrics(); int height = metrics.getHeight(); int y = 5; for (String string : strings) { e.gc.drawString(string, 5, y); y += height + 5; } } } }); return canvas; } case LABEL: { Label label = new Label(parent, SWT.BORDER); label.setText(prefix + " Label"); return label; } case LIST: { List list = new List(parent, SWT.BORDER | SWT.MULTI); list.setItems(prefix + " Item a", prefix + " Item b", prefix + " Item c", prefix + " Item d"); return list; } case COMBO: { Combo combo = new Combo(parent, SWT.BORDER); combo.setItems("Item a", "Item b", "Item c", "Item d"); return combo; } default: throw new SWTError(SWT.ERROR_NOT_IMPLEMENTED); } }