RFR: 8166900: If you wrap a JTable in a JLayer, the cursor is moved to the last row of table by you press the page down key.

[Sergey Bylokhov]

On Thu, 22 Jun 2023 13:47:56 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> If a JTable is wrapped in JLayer and first row is selected and VK_PAGE_DOWN is pressed, the last row of the table is selected instead of the next row after current viewport.
> This is because table.getParent.getSize() returns the whole table size 
> whereas it should be the JViewport which size should be used to calculate the "delta" to be used to scroll the table and select the row and "SwingUtilities.getUnwrappedParent(table)" gets the viewport.
> 
> Tested against SwingSet2 too where it worked too.

test/jdk/javax/swing/JTable/JLayerTableTest.java line 57:

> 55:             @Override public int getRowCount() {return 100;}
> 56:             @Override public int getColumnCount() {return 3;}
> 57:             @Override public Object getValueAt(int row, int column) {return "(" + row + "," + column + ")";}

Please split the long lines to have 80 chars.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/14614#discussion_r1239039647