Unit test writing for controls to test HiDpi

Contributes to #62 and #127

bundles/org.eclipse.swt/Eclipse SWT Tests/win32/org/eclipse/swt/widgets/WidgetWin32Tests.java

@@ -2,8 +2,13 @@
 
 import static org.junit.Assert.assertEquals;
 
+import java.io.*;
+
 import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.internal.*;
+import org.eclipse.swt.internal.win32.*;
+import org.eclipse.swt.layout.*;
 import org.junit.*;
 
 public class WidgetWin32Tests extends Win32AutoscaleTestBase {
@@ -18,8 +23,215 @@ public void testWidgetZoomShouldChangeOnZoomLevelChange() {
 		button.setText("Widget Test");
 		button.setBackground(shell.getDisplay().getSystemColor(SWT.COLOR_CYAN));
 		shell.open();
-		assertEquals("The initial zoom is wrong", zoom, button.getZoom()); //pre-condition
+		assertEquals("The initial zoom is wrong", zoom, button.getZoom()); // pre-condition
 		changeDPIZoom(scaledZoom);
-		assertEquals("The Zoom Level should be updated for button on zoom change event on its shell", scaledZoom, button.getZoom());
+		assertEquals("The Zoom Level should be updated for button on zoom change event on its shell", scaledZoom,
+				button.getZoom());
+	}
+
+	@Test
+	public void testButtonPointsAfterZooming() throws NoSuchMethodException, IllegalAccessException {
+		shell = new Shell(display);
+		shell.setBounds(0, 0, 100, 160);
+		shell.setLayout(new FillLayout());
+		shell.pack();
+
+		Button button = new Button(shell, SWT.PUSH);
+		button.setText("Button");
+		button.setBounds(0, 0, 100, 200);
+		Point sizeBeforeEvent = button.getSize();
+		Point p1 = button.computeSizeInPixels(sizeBeforeEvent.x, sizeBeforeEvent.y, false);
+		changeDPIZoom(200);
+		Point sizeAfterEvent = button.getSize();
+		Point p2 = button.computeSizeInPixels(sizeAfterEvent.x, sizeAfterEvent.y, false);
+
+		Assert.assertEquals("Width should be half in points after zooming to 200", p1.x, p2.x * 2);
+		Assert.assertEquals("Height should be half in points after zooming to 200", p1.y, p2.y * 2);
+	}
+
+	@Test
+	public void testImagePixelsWithDoubleZoomLevel() {
+		InputStream inputStream = WidgetWin32Tests.class.getResourceAsStream("folder.png");
+		Image image = new Image(display, inputStream);
+
+		Point buttonImageSizeBeforeEvent = getImageDimension(image, 100);
+		Point buttonImageSizeAfterEvent = getImageDimension(image, 200);
+
+		Assert.assertEquals("Width of a button image should be doubled after zooming to 200",
+				buttonImageSizeBeforeEvent.x * 2, buttonImageSizeAfterEvent.x);
+		Assert.assertEquals("Height of a button image should be doubled after zooming to 200",
+				buttonImageSizeBeforeEvent.y * 2, buttonImageSizeAfterEvent.y);
+	}
+
+	public Point getImageDimension(Image image, Integer zoomLevel) {
+		BITMAP bm = new BITMAP();
+		OS.GetObject(Image.win32_getHandle(image, zoomLevel), BITMAP.sizeof, bm);
+		int imgWidth = bm.bmWidth;
+		int imgHeight = bm.bmHeight;
+		return new Point(imgWidth, imgHeight);
+	}
+
+	@Test
+	public void testButtonFontAfterZooming() {
+		shell = new Shell(display);
+		shell.setBounds(0, 0, 100, 160);
+		shell.setLayout(new FillLayout());
+		shell.pack();
+
+		Button button = new Button(shell, SWT.PUSH);
+		button.setText("Button");
+		button.setBounds(0, 0, 100, 200);
+		Font font = new Font(display, "Arial", 12, SWT.BOLD);
+		button.setFont(font);
+
+		int heightBeforeZoom = button.getFont().getFontData()[0].data.lfHeight;
+		changeDPIZoom(200);
+		int heightAfterZoom = button.getFont().getFontData()[0].data.lfHeight;
+
+		Assert.assertEquals("Height of a font of the button should be doubled after zooming to 200",
+				heightBeforeZoom * 2, heightAfterZoom);
 	}
+
+	@Test
+	public void testCoolItemAfterZooming() {
+		shell = new Shell(display);
+		shell.setBounds(0, 0, 100, 160);
+		shell.setLayout(new FillLayout());
+		shell.pack();
+
+		CoolBar coolBar = new CoolBar(shell, SWT.NONE);
+		CoolItem item1 = new CoolItem(coolBar, SWT.NONE);
+		Label label1 = new Label(coolBar, SWT.NONE);
+		label1.setText("Label 1");
+		item1.setControl(label1);
+		item1.setPreferredSize(label1.computeSize(SWT.DEFAULT, SWT.DEFAULT));
+		item1.setSize(item1.getPreferredSize());
+
+		var preferredControlSize = item1.getPreferredSizeInPixels();
+		int xBeforeZoom = preferredControlSize.x;
+		int yBeforeZoom = preferredControlSize.y;
+		changeDPIZoom(200);
+		var preferredControlSize2 = item1.getPreferredSizeInPixels();
+		int xAfterZoom = preferredControlSize2.x;
+		int yAfterZoom = preferredControlSize2.y;
+
+		Assert.assertTrue("Height of a Item should be greater after zooming to 200", xBeforeZoom < xAfterZoom);
+		Assert.assertTrue("Width of a Item should be greater after zooming to 200", yBeforeZoom < yAfterZoom);
+	}
+
+	@Test
+	public void testExpandItemAfterZooming() {
+		shell = new Shell(display);
+		shell.setBounds(0, 0, 100, 160);
+		shell.setLayout(new FillLayout());
+		shell.pack();
+
+		ExpandBar coolBar = new ExpandBar(shell, SWT.NONE);
+		ExpandItem item1 = new ExpandItem(coolBar, SWT.NONE);
+		Label label1 = new Label(coolBar, SWT.NONE);
+		label1.setText("Label 1");
+		item1.setControl(label1);
+		item1.setHeight(10);
+		item1.setExpanded(true);
+
+		var heightBeforeZoom = item1.getHeightInPixels();
+		changeDPIZoom(200);
+		var heightAfterZoom = item1.getHeightInPixels();
+
+		Assert.assertEquals("Height of a font of the button should be doubled after zooming to 200",
+				heightBeforeZoom * 2, heightAfterZoom);
+	}
+
+	@Test
+	public void testTabFolderSizeAfterZooming() {
+		shell = new Shell(display);
+		shell.setBounds(0, 0, 100, 160);
+		shell.setLayout(new FillLayout());
+		shell.pack();
+
+		TabFolder tabFolder = new TabFolder(shell, SWT.NONE);
+		tabFolder.setBounds(20, 20, 360, 240);
+
+		TabItem tabItem = new TabItem(tabFolder, SWT.NONE);
+		tabItem.setText("Tab 1");
+		Label label = new Label(tabFolder, SWT.NONE);
+		label.setSize(200, 200);
+		tabItem.setControl(label);
+
+		Point tabItemSizeBeforeEvent = tabItem.getControl().getSize();
+		changeDPIZoom(200);
+		Point tabItemSizeAfterEvent = tabItem.getControl().getSize();
+
+		Assert.assertEquals("Width of a tab folder item should be halved in points after zooming to 200",
+				tabItemSizeBeforeEvent.x, tabItemSizeAfterEvent.x * 2);
+		Assert.assertEquals("Height of a tab folder item should be halved in points after zooming to 200",
+				tabItemSizeBeforeEvent.y, tabItemSizeAfterEvent.y * 2);
+	}
+
+	@Test
+	public void testTableAfterZooming() {
+		shell = new Shell(display);
+		shell.setBounds(0, 0, 100, 160);
+		shell.setLayout(new FillLayout());
+		shell.pack();
+
+		Table table = new Table(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
+		table.setBounds(20, 20, 360, 240);
+		table.setHeaderVisible(true);
+		table.setLinesVisible(true);
+
+		TableColumn column = new TableColumn(table, SWT.NONE);
+		column.setText("Column 1");
+		column.setWidth(200);
+
+		Font font = new Font(display, "Arial", 12, SWT.BOLD);
+
+		TableItem item1 = new TableItem(table, SWT.NONE);
+		item1.setText("Item 1");
+		item1.setFont(font);
+
+		for (TableColumn col : table.getColumns()) {
+			col.pack();
+		}
+
+		int fontHeightBefore = item1.getFont().getFontData()[0].data.lfHeight;
+		changeDPIZoom(200);
+		int fontHeightAfter = item1.getFont().getFontData()[0].data.lfHeight;
+
+		Assert.assertEquals("Height of a font for table item should be doubled after zooming to 200",
+				fontHeightBefore * 2, fontHeightAfter);
+	}
+
+	@Test
+	public void testTreeAfterZooming() {
+		shell = new Shell(display);
+		shell.setBounds(0, 0, 100, 160);
+		shell.setLayout(new FillLayout());
+		shell.pack();
+
+		Tree tree = new Tree(shell, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
+		tree.setBounds(20, 20, 360, 240);
+		tree.setHeaderVisible(true);
+		tree.setLinesVisible(true);
+
+		TreeColumn column = new TreeColumn(tree, SWT.NONE);
+		column.setText("Column 1");
+		column.setWidth(200);
+
+		Font font = new Font(display, "Arial", 12, SWT.BOLD);
+		TreeItem item1 = new TreeItem(tree, SWT.NONE);
+		item1.setText("Item 1");
+		item1.setFont(font);
+		for (TreeColumn col : tree.getColumns()) {
+			col.pack();
+		}
+
+		int fontHeightBefore = item1.getFont().getFontData()[0].data.lfHeight;
+		changeDPIZoom(200);
+		int fontHeightAfter = item1.getFont().getFontData()[0].data.lfHeight;
+
+		Assert.assertEquals("Height of a font for tree item should be doubled after zooming to 200",
+				fontHeightBefore * 2, fontHeightAfter);
+	}
+
 }