From bcd7122c8f9c7051a4aa22656210b7d563b7396d Mon Sep 17 00:00:00 2001 From: Shahzaib Ibrahim Date: Tue, 9 Sep 2025 11:58:24 +0200 Subject: [PATCH] Add Snippet 386: Demonstrates Cursor constructors and DPI scaling in SWT MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This snippet demonstrates several ways to construct and use cursors in an SWT application, including system cursors, custom image cursors, and DPI-aware cursors using ImageDataProvider. The user interface allows interactive selection of the cursor construction method, and updates the shell’s cursor in real time based on the current choice. The snippet displays the current system zoom level (DPI) and the expected cursor size, and draws reference ticks to help visualize scaling effects. It also responds to system DPI changes, ensuring accurate display and behavior at different zoom levels. The code is structured for clarity and modularity, making it suitable for direct use with the SWT Snippet Explorer. --- examples/org.eclipse.swt.snippets/Snippets.md | 1 + .../previews/Snippet386.png | Bin 0 -> 16224 bytes .../org/eclipse/swt/snippets/Snippet386.java | 227 ++++++++++++++++++ 3 files changed, 228 insertions(+) create mode 100644 examples/org.eclipse.swt.snippets/previews/Snippet386.png create mode 100644 examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet386.java diff --git a/examples/org.eclipse.swt.snippets/Snippets.md b/examples/org.eclipse.swt.snippets/Snippets.md index 44ae96a950d..4251fb9d051 100644 --- a/examples/org.eclipse.swt.snippets/Snippets.md +++ b/examples/org.eclipse.swt.snippets/Snippets.md @@ -125,6 +125,7 @@ To contribute a new snippet, [create a snippet contribution as a pull request](h - [create a color cursor from a source and a mask](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet119.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet119.png "Preview for Snippet 119") - [create a color cursor from an image file](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet118.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet118.png "Preview for Snippet 118") - [hide the Cursor over a control](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet242.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet242.png "Preview for Snippet 242") +- [demonstrates various ways to construct and use custom cursors in an SWT application](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet386.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet386.png "Preview for Snippet 386") ### **DateTime** - [create a DateTime calendar and a DateTime time](https://github.com/eclipse-platform/eclipse.platform.swt/tree/master/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet250.java) – [(preview)](https://github.com/eclipse-platform/eclipse.platform.swt/blob/master/examples/org.eclipse.swt.snippets/previews/Snippet250.png "Preview for Snippet 250") diff --git 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zK~*h4(rry12Rn8^x2kJurapI7a5Wzttj+qJj8A+2()iJ%C2$C}&_|l_cU4A7Ljcu{{oM4Va*y6^zQ)N4RyLrFgDV{m?u5(~C zFn7LkdMPhG&<+>H+`Po?1lkGSEpG2G;z5UzO|ceRS4Bz8i<+h01n9!IaO29S;Wh?f zR@YHzd2^mQVb!1`I!hQjVGA1Xc5R~(PQ*;T6^pO4D{Tf>mlDi*q-ni3rmBtWU2?&B zRzRO+u&Bm+UIxn^O5ri7%kYsdKUwPzYSe2f&R{+IR=TE>@7kkkpM4kQ7zC#F)o|-! zZ!3jjSjtJi!wxuSh{D3ndF?zXNY27)W+fmQKLNrpzKy-#hjCcf`~>kMb=U zb;mCuA$>JZ_dXPO4P>TC>++A{;X?G5Mfk*3eEuth47S{{)QuiZ5Pu9v4!e#}O5 + * This example provides a graphical user interface that allows users to select + * from several different {@link org.eclipse.swt.graphics.Cursor} constructors, + * showing the resulting cursor in real time on the application shell. It also + * dynamically updates to reflect changes in system DPI scaling (zoom), + * displaying the expected cursor size and drawing a set of reference ticks to + * help visualize scaling. + *

+ * Features of this snippet include: + *

    + *
  • Combo box to choose between multiple cursor constructors, including + * system, custom image, and DPI-aware providers.
    • + *
  • Live update of the shell cursor based on the user's selection.
    • + *
  • Display of current system zoom level and expected cursor size for visual + * reference.
    • + *
  • Painted tick marks and labels to visualize scaling and cursor positioning + * at different zooms.
    • + *
  • DPI change listener to update UI when system zoom changes.
    • + *
+ * + * This snippet is intended for educational and demonstration purposes to aid + * understanding of cursor creation and DPI handling in SWT. + * + *

+ * For a list of all SWT example snippets see + * http://www.eclipse.org/swt/snippets/ + *

+ */ +public class Snippet386 { + + private static final int IMAGE_SIZE_IN_POINTS = 16; + + public static void main(String[] args) { + Display display = new Display(); + Shell shell = createShell(display); + + Combo combo = createConstructorCombo(shell); + Label zoomLabel = createZoomLabel(shell); + + addZoomChangedListener(shell, zoomLabel); + Group section = new Group(shell, SWT.NONE); + section.setText("Scale"); + section.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); + section.setLayout(new FillLayout()); + addPaintTicks(section); + + CursorManager cursorManager = new CursorManager(display, shell, combo); + combo.addListener(SWT.Selection, e -> cursorManager.updateCursor()); + cursorManager.updateCursor(); + + shell.setSize(400, 400); + shell.open(); + + eventLoop(display, shell); + display.dispose(); + } + + private static Shell createShell(Display display) { + Shell shell = new Shell(display); + shell.setText("Snippet 386"); + shell.setLayout(new GridLayout(1, false)); + return shell; + } + + private static Combo createConstructorCombo(Composite parent) { + Label label = new Label(parent, SWT.NONE); + label.setText("Choose Cursor Constructor:"); + + Combo combo = new Combo(parent, SWT.READ_ONLY); + combo.setItems("Cursor(Device, int)", "Cursor(Device, ImageData, ImageData, int, int)", + "Cursor(Device, ImageData, int, int)", "Cursor(Device, ImageDataProvider, int, int)"); + combo.select(0); + return combo; + } + + private static Label createZoomLabel(Shell parent) { + Label zoomLabel = new Label(parent, SWT.NONE); + zoomLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false)); + setZoomLabelText(parent, zoomLabel); + return zoomLabel; + } + + private static void setZoomLabelText(Shell shell, Label label) { + int zoom = shell.getMonitor().getZoom(); + int expectedCursorSize = Math.round(IMAGE_SIZE_IN_POINTS * (zoom / 100f)); + label.setText("Current zoom: " + zoom + "% \nExpected Cursor Size = " + expectedCursorSize); + } + + private static void addZoomChangedListener(Shell shell, Label zoomLabel) { + shell.addListener(SWT.Resize, event -> { + setZoomLabelText(shell, zoomLabel); + shell.layout(); + }); + } + + private static void addPaintTicks(Composite composite) { + composite.addPaintListener(event -> { + drawTicks(composite, event.gc); + }); + } + + private static void drawTicks(Composite shell, GC gc) { + int deviceZoom = shell.getMonitor().getZoom(); + float devScale = deviceZoom / 100f; + Point client = shell.getSize(); + int xPos = (int) ((client.x / 2) - (6 * (IMAGE_SIZE_IN_POINTS / devScale))); + int tickHeight = 10; + int yPos = 20; + + for (int tickIndex = 0; tickIndex < 6; tickIndex++) { + xPos += (IMAGE_SIZE_IN_POINTS / devScale); + int yOffset = (tickIndex % 3 == 1) ? 20 : (tickIndex % 3 == 2) ? 40 : 0; + + gc.drawLine(xPos, yPos, xPos, yPos + tickHeight); + gc.drawText(Integer.toString(tickIndex * IMAGE_SIZE_IN_POINTS), xPos - 5, yPos + 12 + yOffset); + } + } + + private static void eventLoop(Display display, Shell shell) { + while (!shell.isDisposed()) { + if (!display.readAndDispatch()) + display.sleep(); + } + } + + public static ImageData createSolidColorImageData(int size, RGB color) { + PaletteData palette = new PaletteData(0xFF0000, 0x00FF00, 0x0000FF); + ImageData imageData = new ImageData(size, size, 24, palette); + + int pixel = palette.getPixel(color); + for (int y = 0; y < size; y++) { + for (int x = 0; x < size; x++) { + imageData.setPixel(x, y, pixel); + } + } + return imageData; + } + + private static class CursorManager { + private final Display display; + private final Shell shell; + private final Combo combo; + + CursorManager(Display display, Shell shell, Combo combo) { + this.display = display; + this.shell = shell; + this.combo = combo; + } + + void updateCursor() { + int selection = combo.getSelectionIndex(); + Cursor oldCursor = shell.getCursor(); + if (oldCursor != null && !oldCursor.isDisposed()) { + oldCursor.dispose(); + } + Cursor cursor = createCursor(selection); + if (cursor != null) { + shell.setCursor(cursor); + } + } + + private Cursor createCursor(int selection) { + switch (selection) { + case 0: + return new Cursor(display, SWT.CURSOR_HAND); + case 1: { + PaletteData rgbPalette = new PaletteData(0xFF0000, 0x00FF00, 0x0000FF); + int bluePixel = rgbPalette.getPixel(new RGB(0, 0, 255)); + ImageData source = new ImageData(IMAGE_SIZE_IN_POINTS, IMAGE_SIZE_IN_POINTS, 24, + new PaletteData(0xFF0000, 0x00FF00, 0x0000FF)); + + for (int x = 0; x < IMAGE_SIZE_IN_POINTS; x++) { + for (int y = 0; y < IMAGE_SIZE_IN_POINTS; y++) { + source.setPixel(x, y, bluePixel); + } + } + + ImageData mask = new ImageData(IMAGE_SIZE_IN_POINTS, IMAGE_SIZE_IN_POINTS, 1, + new PaletteData(new RGB[] { new RGB(0, 0, 0), new RGB(255, 255, 255) })); + for (int x = 0; x < IMAGE_SIZE_IN_POINTS; x++) { + for (int y = 0; y < IMAGE_SIZE_IN_POINTS; y++) { + mask.setPixel(x, y, x % 2); + } + } + + return new Cursor(display, source, mask, IMAGE_SIZE_IN_POINTS / 2, IMAGE_SIZE_IN_POINTS / 2); + } + case 2: + RGB red = new RGB(255, 0, 0); + return new Cursor(display, createSolidColorImageData(IMAGE_SIZE_IN_POINTS, red), 0, 0); + + case 3: { + RGB green = new RGB(0, 255, 0); + ImageDataProvider provider = zoom -> { + return createSolidColorImageData(IMAGE_SIZE_IN_POINTS * zoom / 100, green); + }; + return new Cursor(display, provider, 0, 0); + } + default: + return null; + } + } + } +} \ No newline at end of file