Introduce Snippet

Author: Michael5601

examples/org.eclipse.swt.snippets/resources/Snippet386/collapseall.png

@@ -0,0 +1,100 @@
+/*******************************************************************************
+ * Copyright (c) 2025 Vector Informatik GmbH and others.
+ *
+ * This program and the accompanying materials are made available under the terms of the Eclipse
+ * Public License 2.0 which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Michael Bangas (Vector Informatik GmbH) - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.snippets;
+
+import java.io.*;
+import java.util.*;
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.internal.*;
+import org.eclipse.swt.internal.DPIUtil.*;
+import org.eclipse.swt.widgets.*;
+
+public class Snippet386 {
+
+	public static void main(String[] args) {
+		drawWithImageFileNameProvider();
+		drawWithImageDataProvider();
+	}
+
+	private static void drawWithImageFileNameProvider() {
+		ImageFileNameProvider provider = createImageFileNameProvider();
+		Image image = new Image(Display.getDefault(), provider);
+		createShellWithImage(image, "Snippet 386 - ImageFileNameProvider");
+	}
+
+	private static void drawWithImageDataProvider() {
+		ImageDataProvider provider = createImageDataProvider();
+		Image image = new Image(Display.getDefault(), provider);
+		createShellWithImage(image, "Snippet 386 - ImageDataProvider");
+	}
+
+	private static ImageFileNameProvider createImageFileNameProvider() {
+		return new ImageFileNameAtSizeProvider() {
+			@Override
+			public Optional<String> getImagePath(int targetWidth, int targetHeight) {
+				return Optional.of("resources/Snippet386/collapseall.png");
+			}
+
+			@Override
+			public String getImagePath(int zoom) {
+				return "resources/Snippet386/collapseall.png";
+			}
+		};
+	}
+
+	private static ImageDataProvider createImageDataProvider() {
+		return new ImageDataAtSizeProvider() {
+			@SuppressWarnings("restriction")
+			@Override
+			public Optional<ImageData> getImageData(int targetWidth, int targetHeight) {
+				try (InputStream stream = new FileInputStream("resources/Snippet386/collapseall.svg")) {
+					return Optional.of(NativeImageLoader.load(stream, new ImageLoader(), targetWidth, targetHeight));
+				} catch (IOException e) {
+					SWT.error(SWT.ERROR_IO, e);
+				}
+				return null;
+			}
+
+			@SuppressWarnings("restriction")
+			@Override
+			public ImageData getImageData(int zoom) {
+				try (InputStream stream = new FileInputStream("resources/Snippet386/collapseall.svg")) {
+					return NativeImageLoader.load(new ElementAtZoom<>(stream, 100), new ImageLoader(), 100).get(0).element();
+				} catch (IOException e) {
+					SWT.error(SWT.ERROR_IO, e);
+				}
+				return null;
+			}
+		};
+	}
+
+	private static void createShellWithImage(Image image, String title) {
+		Shell shell = new Shell(Display.getDefault(), SWT.SHELL_TRIM | SWT.DOUBLE_BUFFERED);
+		shell.setText(title);
+
+		shell.addListener(SWT.Paint, e -> {
+			Rectangle rect = image.getBounds();
+			e.gc.drawImage(image, 0, 0, rect.width, rect.height, 0, 0, 100, 200);
+		});
+
+		shell.setSize(600, 400);
+		shell.open();
+		while (!shell.isDisposed()) {
+			if (!Display.getDefault().readAndDispatch())
+				Display.getDefault().sleep();
+		}
+		Display.getDefault().dispose();
+	}
+}