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Table: improved cell focus indicator border hiding (issue #654)

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- never for cell selection mode
- for single selected column if contains editable cell
This commit is contained in:
Karl Tauber
2023-03-28 18:33:31 +02:00
parent 2e878b62d1
commit d530624362
1 changed files with 40 additions and 32 deletions
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72
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTableCellBorder.java
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@@ -135,18 +135,21 @@ public class FlatTableCellBorder
//---- class Selected -----------------------------------------------------
/**
* Border for selected cell that uses margins and paints focus indicator border
* Border for selected cell that uses margins and paints focus indicator border.
* The focus indicator is shown under following conditions:
* <ul>
* <li>if enabled (Table.showCellFocusIndicator=true) or
* <li>if column selection is enabled and row selection disabled or
* <li>if cells in only one row are selected and at least one cell is editable
* <li>always if enabled via UI property {@code Table.showCellFocusIndicator=true}
* <li>for row selection mode if exactly one row is selected and at least one cell in that row is editable
* <li>for column selection mode if exactly one column is selected and at least one cell in that column is editable
* <li>never for cell selection mode
* </ul>
* The reason for this logic is to hide the focus indicator when it is not needed,
* and only show it when there are editable cells and the user needs to know
* which cell is focused to start editing.
* <p>
* To avoid possible performance issues, checking for editable cell is limited
* to {@link #maxCheckCellsEditable}.
* To avoid possible performance issues, checking for editable cells is limited
* to {@link #maxCheckCellsEditable}. If there are more cells to check,
* the focus indicator is always shown.
*/
public static class Selected
extends FlatTableCellBorder
@@ -174,48 +177,53 @@ public class FlatTableCellBorder
* @since 3.1
*/
protected boolean shouldShowCellFocusIndicator( JTable table ) {
// show always for column only selection
// (do not check for editable cells because there may be thousands or millions of rows)
if( !table.getRowSelectionAllowed() )
return true;
boolean rowSelectionAllowed = table.getRowSelectionAllowed();
boolean columnSelectionAllowed = table.getColumnSelectionAllowed();
// do not show if more than one row is selected
// (unlikely that user wants edit cell in this case)
if( table.getSelectedRowCount() != 1 )
// do not show for cell selection mode
// (unlikely that user wants edit cell in case that multiple cells are selected;
// if only a single cell is selected then it is clear where the focus is)
if( rowSelectionAllowed && columnSelectionAllowed )
return false;
int selectedRow = table.getSelectedRow();
if( rowSelectionAllowed ) {
// row selection mode
if( table.getColumnSelectionAllowed() ) {
// column and row selection are allowed --> cell selection enabled
int selectedColumnCount = table.getSelectedColumnCount();
// do not show if exactly one cell is selected
if( selectedColumnCount == 1 )
// do not show if more than one row is selected
// (unlikely that user wants edit cell in this case)
if( table.getSelectedRowCount() != 1 )
return false;
// show always if there are too many columns to check for editable
if( selectedColumnCount > maxCheckCellsEditable )
return true;
// check whether at least one selected cell is editable
for( int selectedColumn : table.getSelectedColumns() ) {
if( table.isCellEditable( selectedRow, selectedColumn ) )
return true;
}
} else {
// row selection enabled
int columnCount = table.getColumnCount();
// show always if there are too many columns to check for editable
if( columnCount > maxCheckCellsEditable )
return true;
// check whether at least one selected cell is editable
int selectedRow = table.getSelectedRow();
for( int column = 0; column < columnCount; column++ ) {
if( table.isCellEditable( selectedRow, column ) )
return true;
}
} else if( columnSelectionAllowed ) {
// column selection mode
// do not show if more than one column is selected
// (unlikely that user wants edit cell in this case)
if( table.getSelectedColumnCount() != 1 )
return false;
// show always if there are too many rows to check for editable
int rowCount = table.getRowCount();
if( rowCount > maxCheckCellsEditable )
return true;
// check whether at least one selected cell is editable
int selectedColumn = table.getSelectedColumn();
for( int row = 0; row < rowCount; row++ ) {
if( table.isCellEditable( row, selectedColumn ) )
return true;
}
}
return false;