refactor: Implement BaseHoverPopup for ContextWindowPopup

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/BaseHoverPopup.java

@@ -0,0 +1,298 @@
+package com.microsoft.copilot.eclipse.ui.chat;
+
+import org.eclipse.e4.ui.services.IStylingEngine;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Color;
+import org.eclipse.swt.graphics.Font;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.graphics.Rectangle;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Label;
+import org.eclipse.swt.widgets.Monitor;
+import org.eclipse.swt.widgets.Shell;
+import org.eclipse.ui.PlatformUI;
+
+import com.microsoft.copilot.eclipse.ui.swt.CssConstants;
+import com.microsoft.copilot.eclipse.ui.utils.UiUtils;
+
+/**
+ * Base class for hover popups that appear near an anchor widget and auto-close when the cursor leaves.
+ *
+ * <p>Subclasses implement {@link #populateContent(Composite)} to add their specific widgets, then call
+ * {@link #openPopup(Control)} to display the popup.
+ */
+public abstract class BaseHoverPopup {
+
+  protected static final String DROPDOWN_POPUP_CSS_ID = "dropdown-popup";
+  protected static final int SECTION_SPACING = 8;
+
+  private static final String POPUP_SECONDARY_TEXT_CLASS = "popup-secondary-text";
+  private static final int POPUP_WIDTH = 200;
+  private static final int ROW_SPACING = 2;
+  private static final int BORDER_ARC = 8;
+  private static final int H_MARGIN = 8;
+  private static final int V_MARGIN = 8;
+  private static final int POLL_INTERVAL_MS = 100;
+
+  protected Shell shell;
+  protected Control anchor;
+  protected final IStylingEngine stylingEngine;
+  private Runnable pollRunnable;
+
+  /**
+   * Constructor initializes the styling engine for applying CSS styles to popup widgets.
+   */
+  protected BaseHoverPopup() {
+    this.stylingEngine = PlatformUI.getWorkbench().getService(IStylingEngine.class);
+  }
+
+  /**
+   * Creates the popup shell, calls {@link #populateContent(Composite)}, and opens the popup above the anchor.
+   */
+  protected void openPopup(Control anchorControl) {
+    this.anchor = anchorControl;
+    if (isOpen()) {
+      return;
+    }
+    stopPolling();
+
+    Shell parentShell = anchorControl.getShell();
+    shell = new Shell(parentShell, SWT.NO_TRIM | SWT.ON_TOP);
+
+    GridLayout shellLayout = new GridLayout(1, false);
+    shellLayout.marginWidth = H_MARGIN;
+    shellLayout.marginHeight = V_MARGIN;
+    shellLayout.verticalSpacing = ROW_SPACING;
+    shell.setLayout(shellLayout);
+
+    populateContent(shell);
+    applyCssId(shell, DROPDOWN_POPUP_CSS_ID);
+    addBorder(shell);
+
+    shell.pack();
+    Point size = shell.getSize();
+    shell.setSize(Math.max(size.x, POPUP_WIDTH), size.y);
+    positionPopup(shell, anchorControl);
+    shell.open();
+    startPolling();
+  }
+
+  /**
+   * Subclasses add their specific content widgets to the popup shell.
+   */
+  protected abstract void populateContent(Composite parent);
+
+  /**
+   * Closes the popup and disposes the shell. Should be called when the cursor leaves the popup or anchor.
+   */
+  protected void close() {
+    stopPolling();
+    anchor = null;
+    if (shell != null && !shell.isDisposed()) {
+      shell.dispose();
+      shell = null;
+    }
+  }
+
+  protected boolean isOpen() {
+    return shell != null && !shell.isDisposed();
+  }
+
+  /**
+   * Utility method for adding a section header label with bold font and vertical spacing.
+   *
+   * @param parent the parent composite to add the header to
+   * @param text the header text to display
+   * @param verticalIndent the vertical spacing below the header
+   */
+  protected void addSectionHeader(Composite parent, String text, int verticalIndent) {
+    Label header = new Label(parent, SWT.NONE);
+    header.setText(text);
+    applyCssId(header, DROPDOWN_POPUP_CSS_ID);
+    Font boldFont = UiUtils.getBoldFont(header.getDisplay(), header.getFont());
+    header.addDisposeListener(e -> boldFont.dispose());
+    header.setFont(boldFont);
+    GridData gd = new GridData(SWT.FILL, SWT.NONE, true, false);
+    gd.verticalIndent = verticalIndent;
+    header.setLayoutData(gd);
+  }
+
+  /**
+   * Utility method for adding a horizontal separator with optional top spacing.
+   *
+   * @param parent the parent composite to add the separator to
+   * @param topSpacing the vertical spacing above the separator
+   */
+  protected void addSeparator(Composite parent, int topSpacing) {
+    Composite separator = new Composite(parent, SWT.NONE);
+    applyCssId(separator, DROPDOWN_POPUP_CSS_ID);
+    GridData gd = new GridData(SWT.FILL, SWT.NONE, true, false);
+    gd.heightHint = 1;
+    gd.verticalIndent = topSpacing;
+    separator.setLayoutData(gd);
+    Color sepColor = CssConstants.getSeparatorColor(parent.getDisplay());
+    separator.addPaintListener(e -> {
+      Rectangle r = separator.getClientArea();
+      e.gc.setBackground(sepColor);
+      e.gc.fillRectangle(0, 0, r.width, 1);
+    });
+  }
+
+  /**
+   * Utility method for creating a row composite with two columns for key-value pairs, styled for the popup.
+   *
+   * @param parent the parent composite to add the row to
+   * @return the created row composite with a GridLayout of 2 columns and no margins or spacing
+   */
+  protected Composite createRowComposite(Composite parent) {
+    Composite row = new Composite(parent, SWT.NONE);
+    applyCssId(row, DROPDOWN_POPUP_CSS_ID);
+    GridLayout gl = new GridLayout(2, false);
+    gl.marginWidth = 0;
+    gl.marginHeight = 0;
+    gl.horizontalSpacing = 0;
+    row.setLayout(gl);
+    row.setLayoutData(new GridData(SWT.FILL, SWT.NONE, true, false));
+    return row;
+  }
+
+  /**
+   * Utility method for adding a key-value pair row to the popup, with the key left-aligned and the value right-aligned.
+   *
+   * @param parent the parent composite to add the row to
+   * @param key the text for the key label, which will be left-aligned and take up remaining horizontal space
+   * @param value the text for the value label, which will be right-aligned and take only necessary horizontal space
+   * @return the value label, in case the caller wants to update its text later
+   */
+  protected Label addKeyValueRow(Composite parent, String key, String value) {
+    Composite row = createRowComposite(parent);
+
+    Label keyLabel = createSecondaryTextLabel(row, key);
+    keyLabel.setLayoutData(new GridData(SWT.FILL, SWT.NONE, true, false));
+
+    Label valueLabel = createSecondaryTextLabel(row, value);
+    valueLabel.setLayoutData(new GridData(SWT.RIGHT, SWT.NONE, false, false));
+    return valueLabel;
+  }
+
+  /**
+   * Utility method for creating a label styled as secondary text in the popup, with the appropriate CSS class and ID.
+   *
+   * @param parent the parent composite to add the label to
+   * @param text the text to display in the label
+   * @return the created label with the secondary text style applied
+   */
+  protected Label createSecondaryTextLabel(Composite parent, String text) {
+    Label label = new Label(parent, SWT.NONE);
+    label.setText(text);
+    applyCssId(label, DROPDOWN_POPUP_CSS_ID);
+    UiUtils.applyCssClass(label, POPUP_SECONDARY_TEXT_CLASS, stylingEngine);
+    return label;
+  }
+
+  /**
+   * Utility method for applying a CSS ID to a control and re-styling it with the styling engine.
+   *
+   * @param control the control to apply the CSS ID to
+   * @param cssId the CSS ID to set on the control, which can be used in CSS selectors to style it
+   */
+  protected void applyCssId(Control control, String cssId) {
+    control.setData(CssConstants.CSS_ID_KEY, cssId);
+    if (stylingEngine != null) {
+      stylingEngine.style(control);
+    }
+  }
+
+  private void addBorder(Shell target) {
+    Color borderColor = CssConstants.getBorderColor(target.getDisplay());
+    target.addPaintListener(e -> {
+      Rectangle bounds = target.getClientArea();
+      e.gc.setAntialias(SWT.ON);
+      e.gc.setForeground(borderColor);
+      e.gc.setLineWidth(1);
+      e.gc.drawRoundRectangle(0, 0, bounds.width - 1, bounds.height - 1, BORDER_ARC, BORDER_ARC);
+    });
+  }
+
+  private void positionPopup(Shell popup, Control anchorControl) {
+    Point anchorLoc = anchorControl.toDisplay(0, 0);
+    Point anchorSize = anchorControl.getSize();
+    Point popupSize = popup.getSize();
+
+    int x = anchorLoc.x + (anchorSize.x - popupSize.x) / 2;
+    int y = anchorLoc.y - popupSize.y;
+
+    Rectangle screenBounds = getMonitorBounds(anchorControl.getDisplay(), anchorLoc);
+    x = Math.max(screenBounds.x, Math.min(x, screenBounds.x + screenBounds.width - popupSize.x));
+    if (y < screenBounds.y) {
+      y = anchorLoc.y + anchorSize.y;
+    }
+    popup.setLocation(x, y);
+  }
+
+  private static Rectangle getMonitorBounds(Display display, Point location) {
+    for (Monitor monitor : display.getMonitors()) {
+      if (monitor.getBounds().contains(location)) {
+        return monitor.getBounds();
+      }
+    }
+    return display.getPrimaryMonitor().getBounds();
+  }
+
+  private void startPolling() {
+    Display display = getActiveDisplay();
+    if (display == null) {
+      return;
+    }
+    pollRunnable = () -> {
+      if (shell == null || shell.isDisposed()) {
+        return;
+      }
+      if (!isCursorInside(anchor) && !isCursorInside(shell)) {
+        close();
+      } else {
+        display.timerExec(POLL_INTERVAL_MS, pollRunnable);
+      }
+    };
+    display.timerExec(POLL_INTERVAL_MS, pollRunnable);
+  }
+
+  private void stopPolling() {
+    Display display = getActiveDisplay();
+    if (display != null && pollRunnable != null) {
+      display.timerExec(-1, pollRunnable);
+    }
+    pollRunnable = null;
+  }
+
+  private Display getActiveDisplay() {
+    if (shell != null && !shell.isDisposed()) {
+      return shell.getDisplay();
+    }
+    if (anchor != null && !anchor.isDisposed()) {
+      return anchor.getDisplay();
+    }
+    return null;
+  }
+
+  private boolean isCursorInside(Control control) {
+    if (control == null || control.isDisposed()) {
+      return false;
+    }
+    Display display = control.getDisplay();
+    if (display == null || display.isDisposed()) {
+      return false;
+    }
+    return getDisplayBounds(control).contains(display.getCursorLocation());
+  }
+
+  private static Rectangle getDisplayBounds(Control control) {
+    Point location = control.toDisplay(0, 0);
+    Point size = control.getSize();
+    return new Rectangle(location.x, location.y, size.x, size.y);
+  }
+}