/** Creates the "Example" widgets. */
void createExampleWidgets() {
/* Compute the widget style */
int style = getDefaultStyle();
if (horizontalButton.getSelection()) style |= SWT.H_SCROLL;
if (verticalButton.getSelection()) style |= SWT.V_SCROLL;
if (borderButton.getSelection()) style |= SWT.BORDER;
if (noBackgroundButton.getSelection()) style |= SWT.NO_BACKGROUND;
if (noFocusButton.getSelection()) style |= SWT.NO_FOCUS;
if (noMergePaintsButton.getSelection()) style |= SWT.NO_MERGE_PAINTS;
if (noRedrawResizeButton.getSelection()) style |= SWT.NO_REDRAW_RESIZE;
/* Create the example widgets */
paintCount = 0;
cx = 0;
cy = 0;
canvas = new Canvas(canvasGroup, style);
canvas.addPaintListener(
new PaintListener() {
public void paintControl(PaintEvent e) {
paintCount++;
GC gc = e.gc;
if (fillDamageButton.getSelection()) {
Color color = e.display.getSystemColor(colors[paintCount % colors.length]);
gc.setBackground(color);
gc.fillRectangle(e.x, e.y, e.width, e.height);
}
Point size = canvas.getSize();
gc.drawArc(cx + 1, cy + 1, size.x - 2, size.y - 2, 0, 360);
gc.drawRectangle(cx + (size.x - 10) / 2, cy + (size.y - 10) / 2, 10, 10);
}
});
canvas.addControlListener(
new ControlAdapter() {
public void controlResized(ControlEvent event) {
Point size = canvas.getSize();
maxX = size.x * 3 / 2;
maxY = size.y * 3 / 2;
resizeScrollBars();
}
});
ScrollBar bar = canvas.getHorizontalBar();
if (bar != null) {
bar.addSelectionListener(
new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
scrollHorizontal((ScrollBar) event.widget);
}
});
}
bar = canvas.getVerticalBar();
if (bar != null) {
bar.addSelectionListener(
new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
scrollVertical((ScrollBar) event.widget);
}
});
}
}
/**
* Scrolls the canvas vertically.
*
* @param scrollBar
*/
void scrollVertical(ScrollBar scrollBar) {
Rectangle bounds = canvas.getClientArea();
int y = -scrollBar.getSelection();
if (y + maxY < bounds.height) {
y = bounds.height - maxY;
}
canvas.scroll(cx, y, cx, cy, maxX, maxY, false);
cy = y;
}
/**
* Scrolls the canvas horizontally.
*
* @param scrollBar
*/
void scrollHorizontal(ScrollBar scrollBar) {
Rectangle bounds = canvas.getClientArea();
int x = -scrollBar.getSelection();
if (x + maxX < bounds.width) {
x = bounds.width - maxX;
}
canvas.scroll(x, cy, cx, cy, maxX, maxY, false);
cx = x;
}
public static void scribbleTab() {
TabItem tab = new TabItem(folder, SWT.CLOSE);
tab.setText("Scribble");
tab.setToolTipText("Simple graphics: drawing");
final Canvas canvas = new Canvas(folder, SWT.NONE);
ScribbleMouseListener sml = new ScribbleMouseListener();
canvas.addMouseListener(sml);
canvas.addMouseMoveListener(sml);
tab.setControl(canvas);
}
/** Resizes the maximum and thumb of both scrollbars. */
void resizeScrollBars() {
Rectangle clientArea = canvas.getClientArea();
ScrollBar bar = canvas.getHorizontalBar();
if (bar != null) {
bar.setMaximum(maxX);
bar.setThumb(clientArea.width);
bar.setPageIncrement(clientArea.width);
}
bar = canvas.getVerticalBar();
if (bar != null) {
bar.setMaximum(maxY);
bar.setThumb(clientArea.height);
bar.setPageIncrement(clientArea.height);
}
}
/** Sets or clears the caret in the "Example" widget. */
void setCaret() {
Caret oldCaret = canvas.getCaret();
if (caretButton.getSelection()) {
Caret newCaret = new Caret(canvas, SWT.NONE);
Font font = canvas.getFont();
newCaret.setFont(font);
GC gc = new GC(canvas);
gc.setFont(font);
newCaret.setBounds(1, 1, 1, gc.getFontMetrics().getHeight());
gc.dispose();
canvas.setCaret(newCaret);
canvas.setFocus();
} else {
canvas.setCaret(null);
}
if (oldCaret != null) oldCaret.dispose();
}
/** Initialize the canvas in the appropriate part of the window */
public void initCanvas() {
canvas = new Canvas(shell, SWT.NO_BACKGROUND | SWT.BORDER);
GridData gridData = new GridData();
gridData.horizontalAlignment = GridData.FILL;
gridData.verticalAlignment = GridData.FILL;
gridData.grabExcessHorizontalSpace = true;
gridData.grabExcessVerticalSpace = true;
canvas.setLayoutData(gridData);
}
/** Sets the state of the "Example" widgets. */
void setExampleWidgetState() {
super.setExampleWidgetState();
horizontalButton.setSelection((canvas.getStyle() & SWT.H_SCROLL) != 0);
verticalButton.setSelection((canvas.getStyle() & SWT.V_SCROLL) != 0);
borderButton.setSelection((canvas.getStyle() & SWT.BORDER) != 0);
noBackgroundButton.setSelection((canvas.getStyle() & SWT.NO_BACKGROUND) != 0);
noFocusButton.setSelection((canvas.getStyle() & SWT.NO_FOCUS) != 0);
noMergePaintsButton.setSelection((canvas.getStyle() & SWT.NO_MERGE_PAINTS) != 0);
noRedrawResizeButton.setSelection((canvas.getStyle() & SWT.NO_REDRAW_RESIZE) != 0);
setCaret();
}
public static void main(String[] args) {
final ImageFileNameProvider filenameProvider =
new ImageFileNameProvider() {
@Override
public String getImagePath(int zoom) {
switch (zoom) {
case 150:
return IMAGE_PATH_150;
case 200:
return IMAGE_PATH_200;
default:
return IMAGE_PATH_100;
}
}
};
final ImageDataProvider imageDataProvider =
new ImageDataProvider() {
@Override
public ImageData getImageData(int zoom) {
switch (zoom) {
case 150:
return new ImageData(IMAGE_PATH_150);
case 200:
return new ImageData(IMAGE_PATH_200);
default:
return new ImageData(IMAGE_PATH_100);
}
}
};
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new GridLayout(2, false));
new Label(shell, SWT.NONE).setText(IMAGE_200 + ":");
new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_200));
new Label(shell, SWT.NONE).setText(IMAGE_150 + ":");
new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_150));
new Label(shell, SWT.NONE).setText(IMAGE_100 + ":");
new Label(shell, SWT.NONE).setImage(new Image(display, IMAGE_PATH_100));
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("ImageFileNameProvider:");
new Label(shell, SWT.NONE).setImage(new Image(display, filenameProvider));
new Label(shell, SWT.NONE).setText("ImageDataProvider:");
new Label(shell, SWT.NONE).setImage(new Image(display, imageDataProvider));
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("Canvas\n(PaintListener)");
final Point size = new Point(550, 35);
final Canvas canvas = new Canvas(shell, SWT.NONE);
canvas.addPaintListener(
new PaintListener() {
@Override
public void paintControl(PaintEvent e) {
Point size = canvas.getSize();
paintImage(e.gc, size);
}
});
canvas.setLayoutData(new GridData(size.x, size.y));
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("Painted image\n (default resolution)");
Image image = new Image(display, size.x, size.y);
GC gc = new GC(image);
try {
paintImage(gc, size);
} finally {
gc.dispose();
}
new Label(shell, SWT.NONE).setImage(image);
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("Painted image\n(multi-res, unzoomed paint)");
new Label(shell, SWT.NONE)
.setImage(
new Image(
display,
new ImageDataProvider() {
@Override
public ImageData getImageData(int zoom) {
Image temp = new Image(display, size.x * zoom / 100, size.y * zoom / 100);
GC gc = new GC(temp);
try {
paintImage(gc, size);
return temp.getImageData();
} finally {
gc.dispose();
temp.dispose();
}
}
}));
new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL)
.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1));
new Label(shell, SWT.NONE).setText("Painted image\n(multi-res, zoomed paint)");
new Label(shell, SWT.NONE)
.setImage(
new Image(
display,
new ImageDataProvider() {
@Override
public ImageData getImageData(int zoom) {
Image temp = new Image(display, size.x * zoom / 100, size.y * zoom / 100);
GC gc = new GC(temp);
try {
paintImage2(
gc, new Point(size.x * zoom / 100, size.y * zoom / 100), zoom / 100);
return temp.getImageData();
} finally {
gc.dispose();
temp.dispose();
}
}
}));
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}