Reorganized monitor-bound utils in Tree #62

This commit contributes to moving
Tree:getContainingMonitorBoundsInPixels and
Tree:fitRectangleBoundsIntoMonitor to CoordinateSystemMapper and Display,
respectively for better clarity and encapsulation.

contributes to
#62 and
#128

Author: amartya4256

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/CoordinateSystemMapper.java

@@ -35,6 +35,8 @@ interface CoordinateSystemMapper {
 
 	Rectangle translateToDisplayCoordinates(Rectangle rect, int zoom);
 
+	Rectangle getContainingMonitorBoundsInPixels(Point point);
+
 	void setCursorLocation(int x, int y);
 
 	Point getCursorLocation();

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Display.java

@@ -1724,6 +1724,28 @@ public Point getCursorLocation () {
 	return coordinateSystemMapper.getCursorLocation();
 }
 
+Rectangle fitRectangleBoundsIntoMonitorWithCursor(RECT rect) {
+	Rectangle monitorBounds = coordinateSystemMapper.getContainingMonitorBoundsInPixels(getCursorLocation());
+	if (monitorBounds == null) {
+		return null;
+	}
+	int rectWidth = rect.right - rect.left;
+	int rectHeight = rect.bottom - rect.top;
+	if (rect.left < monitorBounds.x) {
+		rect.left = monitorBounds.x;
+	}
+	int monitorBoundsRightEnd = monitorBounds.x + monitorBounds.width;
+	if (rect.right > monitorBoundsRightEnd) {
+		if (rectWidth <= monitorBounds.width) {
+			rect.left = monitorBoundsRightEnd - rectWidth;
+		} else {
+			rect.left = monitorBounds.x;
+		}
+		rectWidth = monitorBoundsRightEnd - rect.left;
+	}
+	return new Rectangle(rect.left, rect.top, rectWidth, rectHeight);
+}
+
 Point getCursorLocationInPixels () {
 	POINT pt = new POINT ();
 	OS.GetCursorPos (pt);

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/MultiZoomCoordinateSystemMapper.java

@@ -271,4 +271,11 @@ private int getApplicableMonitorZoom(Monitor monitor) {
 		return DPIUtil.getZoomForAutoscaleProperty(monitor.zoom);
 	}
 
+	@Override
+	public Rectangle getContainingMonitorBoundsInPixels(Point point) {
+		Monitor monitor = point instanceof MonitorAwarePoint monitorAwarePoint ? monitorAwarePoint.getMonitor()
+				: getContainingMonitorForPoints(point.x, point.y);
+		return getMonitorClientAreaInPixels(monitor);
+	}
+
 }

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/SingleZoomCoordinateSystemMapper.java

@@ -105,4 +105,17 @@ public Point getCursorLocation() {
 	public void setCursorLocation(int x, int y) {
 		display.setCursorLocationInPixels(DPIUtil.autoScaleUp(x), DPIUtil.autoScaleUp(y));
 	}
+
+	@Override
+	public Rectangle getContainingMonitorBoundsInPixels(Point point) {
+		int zoom = DPIUtil.getDeviceZoom();
+		point = DPIUtil.scaleUp(point, zoom);
+		for (Monitor monitor : display.getMonitors()) {
+			Rectangle monitorBounds = DPIUtil.scaleUp(monitor.getBounds(), zoom);
+			if (monitorBounds.contains(point)) {
+				return monitorBounds;
+			}
+		}
+		return null;
+	}
 }

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Tree.java

@@ -8175,12 +8175,9 @@ private LRESULT positionTooltip(NMHDR hdr, long wParam, long lParam, boolean man
 		// triggers additional display messages to SWT, creating an infinite loop
 		// of positioning and re-scaling events.
 		// Refer: https://github.com/eclipse-platform/eclipse.platform.swt/issues/557
-		Point cursorLocation = display.getCursorLocation();
-		Rectangle monitorBounds = cursorLocation instanceof MonitorAwarePoint monitorAwarePoint
-				? getContainingMonitorBoundsInMultiZoomCoordinateSystem(monitorAwarePoint)
-				: getContainingMonitorBoundsInSingleZoomCoordinateSystem(cursorLocation);
-		if (monitorBounds != null) {
-			Rectangle adjustedTooltipBounds = fitTooltipBoundsIntoMonitor(toolRect, monitorBounds);
+
+		Rectangle adjustedTooltipBounds = getDisplay().fitRectangleBoundsIntoMonitorWithCursor(toolRect);
+		if(adjustedTooltipBounds != null) {
 			OS.SetWindowPos (hdr.hwndFrom, 0, adjustedTooltipBounds.x, adjustedTooltipBounds.y, adjustedTooltipBounds.width, adjustedTooltipBounds.height, flags);
 			result = LRESULT.ONE;
 		}
@@ -8196,45 +8193,6 @@ private LRESULT positionTooltip(NMHDR hdr, long wParam, long lParam, boolean man
 	return result;
 }
 
-/**
- * Adjust the tool tip to fit in a single monitor either by shifting its position or by adjusting it's width.
- */
-private Rectangle fitTooltipBoundsIntoMonitor(RECT tooltipBounds, Rectangle monitorBounds) {
-	int tooltipWidth = tooltipBounds.right - tooltipBounds.left;
-	int tooltipHeight = tooltipBounds.bottom - tooltipBounds.top;
-	if (tooltipBounds.left < monitorBounds.x) {
-		tooltipBounds.left = monitorBounds.x;
-	}
-	int monitorBoundsRightEnd = monitorBounds.x + monitorBounds.width;
-	if (tooltipBounds.right > monitorBoundsRightEnd) {
-		if (tooltipWidth <= monitorBounds.width) {
-			tooltipBounds.left = monitorBoundsRightEnd - tooltipWidth;
-		} else {
-			tooltipBounds.left = monitorBounds.x;
-		}
-		tooltipWidth = monitorBoundsRightEnd - tooltipBounds.left;
-	}
-	return new Rectangle(tooltipBounds.left, tooltipBounds.top, tooltipWidth, tooltipHeight);
-}
-
-private Rectangle getContainingMonitorBoundsInSingleZoomCoordinateSystem(Point point) {
-	int zoom = getZoom();
-	point = DPIUtil.scaleUp(point, zoom);
-	for (Monitor monitor : display.getMonitors()) {
-		Rectangle monitorBounds = DPIUtil.scaleUp(monitor.getBounds(), zoom);
-		if (monitorBounds.contains(point)) {
-			return monitorBounds;
-		}
-	}
-	return null;
-}
-
-private Rectangle getContainingMonitorBoundsInMultiZoomCoordinateSystem(MonitorAwarePoint point) {
-	Monitor monitor = point.getMonitor();
-	return new Rectangle(monitor.x, monitor.y, DPIUtil.scaleUp(monitor.width, monitor.zoom),
-			DPIUtil.scaleUp(monitor.height, monitor.zoom));
-}
-
 LRESULT wmNotifyToolTip (NMTTCUSTOMDRAW nmcd, long lParam) {
 	switch (nmcd.dwDrawStage) {
 		case OS.CDDS_PREPAINT: {