REPORT-54998 完善一下这边的判断逻辑，使其更加清晰

designer-realize/src/main/java/com/fr/grid/GridMouseAdapter.java

@@ -46,6 +46,10 @@ public class GridMouseAdapter implements MouseListener, MouseWheelListener, Mous
     private static final int TOOLTIP_X_Y_FIX = 4;
     private static final double COPY_CROSS_INNER_DISTANCE = 1.5;
     private static final double COPY_CROSS_OUTER_DISTANCE = 2.5;
+    private static final int DIRECTION_UP = 1;
+    private static final int DIRECTION_DOWN = 2;
+    private static final int DIRECTION_LEFT = 3;
+    private static final int DIRECTION_RIGHT = 4;
     /**
      * 拖拽时候刷新时间间隔
      */
@@ -457,48 +461,127 @@ public class GridMouseAdapter implements MouseListener, MouseWheelListener, Mous
         if (cellRectangle.contains(selectedCellPoint.getColumn(), selectedCellPoint.getRow())) {
             grid.getDragRectangle().setBounds(cellRectangle);
         } else {
+            if (isOutECBlockPane(evtX, evtY)) {
+                return;
+            }
             int xDistance = evtX - this.oldEvtX;
             int yDistance = evtY - this.oldEvtY;
+            int dragDirection = calculateDragDirection(xDistance, yDistance);
+            grid.getDragRectangle().x = calculateDragRectangleX(selectedCellPoint, cellRectangle, dragDirection);
+            grid.getDragRectangle().y = calculateDragRectangleY(selectedCellPoint, cellRectangle, dragDirection);
+            grid.getDragRectangle().width = calculateDragRectangleWidth(selectedCellPoint, cellRectangle, dragDirection);
+            grid.getDragRectangle().height = calculateDragRectangleHeight(selectedCellPoint, cellRectangle, dragDirection);
+        }
+        reportPane.ensureColumnRowVisible(selectedCellPoint.getColumn() + 1, selectedCellPoint.getRow() + 1);
+    }
+
+    private int calculateDragDirection(int xDistance, int yDistance) {
         if (Math.abs(yDistance) > Math.abs(xDistance)) {
-                grid.getDragRectangle().x = cellRectangle.x;
-                grid.getDragRectangle().width = cellRectangle.width;
             if (yDistance >= 0) {
-                    // 聚合报表要求拖拽的时候要在本块的内部进行 不能无限往下拖
+                return DIRECTION_DOWN;
-                    if (reportPane instanceof ECBlockPane && evtY > reportPane.getBounds().height - ECBlockGap) {
+            } else {
-                        return;
+                return DIRECTION_UP;
             }
-                    grid.getDragRectangle().y = cellRectangle.y;
-                    grid.getDragRectangle().height = selectedCellPoint.getRow() - cellRectangle.y + 1;
         } else {
-                    if (selectedCellPoint.getRow() >= cellRectangle.y && selectedCellPoint.getRow() < cellRectangle.y + cellRectangle.height) {
+            if (xDistance >= 0) {
-                        grid.getDragRectangle().y = cellRectangle.y;
+                return DIRECTION_RIGHT;
-                        grid.getDragRectangle().height = cellRectangle.height;
             } else {
-                        grid.getDragRectangle().y = selectedCellPoint.getRow();
+                return DIRECTION_LEFT;
-                        grid.getDragRectangle().height = cellRectangle.y - selectedCellPoint.getRow() + cellRectangle.height;
+            }
         }
     }
+
+    private int calculateDragRectangleX(ColumnRow currentMouseCell, Rectangle startRec, int direction) {
+        int result = 0;
+        switch(direction) {
+            case DIRECTION_DOWN:
+            case DIRECTION_UP:
+            case DIRECTION_RIGHT:
+                result = startRec.x;
+                break;
+            case DIRECTION_LEFT:
+                if (isInsideSelectedCell(currentMouseCell, startRec, direction)) {
+                    result = startRec.x;
                 } else {
-                grid.getDragRectangle().y = cellRectangle.y;
+                    result = currentMouseCell.getColumn();
-                grid.getDragRectangle().height = cellRectangle.height;
-                if (xDistance >= 0) {
-                    if (reportPane instanceof ECBlockPane && evtX > reportPane.getBounds().width - ECBlockGap) {
-                        return;
                 }
-                    grid.getDragRectangle().x = cellRectangle.x;
+                break;
-                    grid.getDragRectangle().width = selectedCellPoint.getColumn() - cellRectangle.x + 1;
+        }
+        return result;
+    }
+
+    private int calculateDragRectangleY(ColumnRow currentMouseCell, Rectangle startRec, int direction) {
+        int result = 0;
+        switch(direction) {
+            case DIRECTION_RIGHT:
+            case DIRECTION_LEFT:
+            case DIRECTION_DOWN:
+                result = startRec.y;
+                break;
+            case DIRECTION_UP:
+                if (isInsideSelectedCell(currentMouseCell, startRec, direction)) {
+                    result = startRec.y;
                 } else {
-                    if (selectedCellPoint.getColumn() >= cellRectangle.x && selectedCellPoint.getColumn() < cellRectangle.x + cellRectangle.width) {
+                    result = currentMouseCell.getRow();
-                        grid.getDragRectangle().x = cellRectangle.x;
+                }
-                        grid.getDragRectangle().width = cellRectangle.width;
+                break;
+        }
+        return result;
+    }
+
+    private int calculateDragRectangleWidth(ColumnRow currentMouseCell, Rectangle startRec, int direction) {
+        int result = 0;
+        switch(direction) {
+            case DIRECTION_DOWN:
+            case DIRECTION_UP:
+                result = startRec.width;
+                break;
+            case DIRECTION_RIGHT:
+                result = currentMouseCell.getColumn() - startRec.x + 1;
+                break;
+            case DIRECTION_LEFT:
+                if (isInsideSelectedCell(currentMouseCell, startRec, direction)) {
+                    result = startRec.width;
                 } else {
-                        grid.getDragRectangle().x = selectedCellPoint.getColumn();
+                    result = startRec.x - currentMouseCell.getColumn() + startRec.width;
-                        grid.getDragRectangle().width = cellRectangle.x - selectedCellPoint.getColumn() + cellRectangle.width;
                 }
+                break;
         }
+        return result;
     }
+
+    private int calculateDragRectangleHeight(ColumnRow currentMouseCell, Rectangle startRec, int direction) {
+        int result = 0;
+        switch(direction) {
+            case DIRECTION_DOWN:
+                result = currentMouseCell.getRow() - startRec.y + 1;
+                break;
+            case DIRECTION_UP:
+                if (isInsideSelectedCell(currentMouseCell, startRec, direction)) {
+                    result = startRec.y - currentMouseCell.getRow() + startRec.height;
+                } else {
+                    result = startRec.height;
                 }
-        reportPane.ensureColumnRowVisible(selectedCellPoint.getColumn() + 1, selectedCellPoint.getRow() + 1);
+                break;
+            case DIRECTION_RIGHT:
+            case DIRECTION_LEFT:
+                result = startRec.height;
+                break;
+        }
+        return result;
+    }
+
+    private boolean isOutECBlockPane(int evtX, int evtY) {
+        ElementCasePane reportPane = grid.getElementCasePane();
+        if (reportPane instanceof ECBlockPane) {
+            return (evtY > reportPane.getBounds().height - ECBlockGap) || (evtX > reportPane.getBounds().width - ECBlockGap);
+        }
+        return true;
+    }
+
+    private boolean isInsideSelectedCell(ColumnRow currentMouseCell, Rectangle startRec, int direction) {
+        return (direction == DIRECTION_UP && currentMouseCell.getRow() >= startRec.y && currentMouseCell.getRow() < startRec.y + startRec.height) ||
+                (direction == DIRECTION_LEFT && currentMouseCell.getColumn() >= startRec.x && currentMouseCell.getColumn() < startRec.x + startRec.width);
     }
 
     private void doShiftSelectCell(double evtX, double evtY) {