Expose column and row min setting in GridView

- Add method setMinSize for setting minimum width for columns
  and minimum height for rows.
- Relates #805

spring-shell-core/src/main/java/org/springframework/shell/component/view/control/GridView.java

@@ -29,6 +29,7 @@ import org.springframework.shell.component.view.event.MouseHandler;
 import org.springframework.shell.component.view.event.MouseHandler.MouseHandlerResult;
 import org.springframework.shell.component.view.geom.Rectangle;
 import org.springframework.shell.component.view.screen.Screen;
+import org.springframework.util.Assert;
 
 /**
  * {@code GridView} is a layout container with no initial {@link View views}.
@@ -54,38 +55,41 @@ public class GridView extends BoxView {
 	private boolean showBorders;
 
 	/**
-	 * Defines how the columns of the grid are distributed. Each value
-	 * defines the size of one column, starting with the leftmost column. Values
-	 * greater 0 represent absolute column widths (gaps not included). Values less
-	 * or equal 0 represent proportional column widths or fractions of the remaining
-	 * free space, where 0 is treated the same as -1. That is, a column with a value
+	 * Defines how the columns of the grid are distributed. Each value defines the
+	 * size of one column, starting with the leftmost column. Values greater 0
+	 * represent absolute column widths (gaps not included). Values less or equal 0
+	 * represent proportional column widths or fractions of the remaining free
+	 * space, where 0 is treated the same as -1. That is, a column with a value
 	 * of -3 will have three times the width of a column with a value of -1 (or 0).
-	 * The minimum width set with SetMinSize() is always observed.
+	 * The minimum width set with {@link #setMinSize(int, int)} is always observed.
 	 *
-	 * Views may extend beyond the columns defined explicitly with this
-	 * function. A value of 0 is assumed for any undefined column. In fact, if you
-	 * never call this function, all columns occupied by Views will have the
-	 * same width. On the other hand, unoccupied columns defined with this function
-	 * will always take their place.
+	 * <p>Views may extend beyond the columns defined explicitly with this function. A
+	 * value of 0 is assumed for any undefined column. In fact, if you never call
+	 * this function, all columns occupied by Views will have the same width. On the
+	 * other hand, unoccupied columns defined with this function will always take
+	 * their place.
 	 *
-	 * Assuming a total width of the grid of 100 cells and a minimum width of 0, the
+	 * <p>Assuming a total width of the grid of 100 cells and a minimum width of 0, the
 	 * following call will result in columns with widths of 30, 10, 15, 15, and 30
 	 * cells:
+	 * <p>
 	 *
-	 * grid.SetColumns(30, 10, -1, -1, -2)
+	 * grid.setColumnSize(30, 10, -1, -1, -2)
 	 *
-	 * If a primitive were then placed in the 6th and 7th column, the resulting
+	 * <p>If a {@link View} were then placed in the 6th and 7th column, the resulting
 	 * widths would be: 30, 10, 10, 10, 20, 10, and 10 cells.
 	 *
-	 * If you then called SetMinSize() as follows:
+	 * If you then called setMinSize() as follows:
+	 * <p>
 	 *
-	 * grid.SetMinSize(15, 20)
+	 * grid.setMinSize(15, 20)
 	 *
-	 * The resulting widths would be: 30, 15, 15, 15, 20, 15, and 15 cells, a total
+	 * <p>The resulting widths would be: 30, 15, 15, 15, 20, 15, and 15 cells, a total
 	 * of 125 cells, 25 cells wider than the available grid width.
 	 *
-	 * @param columns
-	 * @return
+	 * @param columns the column sizes
+	 * @return a grid view for chaining
+	 * @see #setRowSize(int...)
 	 */
 	public GridView setColumnSize(int... columns) {
 		this.columnSize = columns;
@@ -93,9 +97,10 @@ public class GridView extends BoxView {
 	}
 
 	/**
+	 * For documentation see {@link #setColumnSize(int...)} as it's equivalent for rows.
 	 *
-	 * @param rows
-	 * @return
+	 * @param rows the row sizes
+	 * @return a grid view for chaining
 	 * @see #setColumnSize(int...)
 	 */
 	public GridView setRowSize(int... rows) {
@@ -103,6 +108,21 @@ public class GridView extends BoxView {
 		return this;
 	}
 
+	/**
+	 * Sets an absolute minimum width for rows and an absolute minimum height for
+	 * columns. Negative values cannot be used.
+	 *
+	 * @param minWidth the rows minimum width
+	 * @param minHeight the columns minimum height
+	 * @return a grid view for chaining
+	 */
+	public GridView setMinSize(int minWidth, int minHeight) {
+		Assert.state(minWidth > -1 || minHeight > -1, "Minimum sizes for rows or colums cannot be negative");
+		this.minWidth = minWidth;
+		this.minHeight = minHeight;
+		return this;
+	}
+
 	public GridView addItem(View view, int row, int column, int rowSpan, int colSpan, int minGridHeight,
 			int minGridWidth) {
 		GridItem gridItem = new GridItem(view, row, column, colSpan, rowSpan, minGridHeight,