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Table: optionally paint alternating rows below table if table is smaller than scroll pane (issue #504)

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This commit is contained in:
Karl Tauber
2022-05-25 11:18:22 +02:00
parent 90de14d013
commit 58dbccec2d
5 changed files with 108 additions and 13 deletions
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37
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTableUI.java
View File

@@ -80,6 +80,7 @@ import com.formdev.flatlaf.util.UIScale;
* @uiDefault Table.intercellSpacing Dimension
* @uiDefault Table.selectionInactiveBackground Color
* @uiDefault Table.selectionInactiveForeground Color
* @uiDefault Table.paintOutsideAlternateRows boolean
*
* <!-- FlatTableCellBorder -->
*
@@ -95,7 +96,7 @@ import com.formdev.flatlaf.util.UIScale;
*/
public class FlatTableUI
extends BasicTableUI
implements StyleableUI
implements StyleableUI, FlatViewportUI.ViewportPainter
{
protected boolean showHorizontalLines;
protected boolean showVerticalLines;
@@ -421,4 +422,38 @@ public class FlatTableUI
? (viewport != rowHeader)
: (viewport == rowHeader || rowHeader == null);
}
/** @since 2.3 */
@Override
public void paintViewport( Graphics g, JComponent c, JViewport viewport ) {
int viewportWidth = viewport.getWidth();
int viewportHeight = viewport.getHeight();
// fill viewport background in same color as table background
if( viewport.isOpaque() ) {
g.setColor( table.getBackground() );
g.fillRect( 0, 0, viewportWidth, viewportHeight );
}
// paint alternating empty rows
boolean paintOutside = UIManager.getBoolean( "Table.paintOutsideAlternateRows" );
Color alternateColor;
if( paintOutside && (alternateColor = UIManager.getColor( "Table.alternateRowColor" )) != null ) {
g.setColor( alternateColor );
int rowCount = table.getRowCount();
// paint alternating empty rows below the table
int tableHeight = table.getHeight();
if( tableHeight < viewportHeight ) {
int tableWidth = table.getWidth();
int rowHeight = table.getRowHeight();
for( int y = tableHeight, row = rowCount; y < viewportHeight; y += rowHeight, row++ ) {
if( row % 2 != 0 )
g.fillRect( 0, y, tableWidth, rowHeight );
}
}
}
}
}

33
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatViewportUI.java
View File

@@ -18,8 +18,8 @@ package com.formdev.flatlaf.ui;
import java.awt.Component;
import java.awt.Graphics;
import java.lang.reflect.Method;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.JViewport;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicViewportUI;
@@ -43,15 +43,28 @@ public class FlatViewportUI
}
@Override
public void update( Graphics g, JComponent c ) {
Component view = ((JViewport)c).getView();
if( c.isOpaque() && view instanceof JTable ) {
// paint viewport background in same color as table background
g.setColor( view.getBackground() );
g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
public void paint( Graphics g, JComponent c ) {
super.paint( g, c );
paint( g, c );
} else
super.update( g, c );
Component view = ((JViewport)c).getView();
if( view instanceof JComponent ) {
try {
Method m = view.getClass().getMethod( "getUI" );
Object ui = m.invoke( view );
if( ui instanceof ViewportPainter )
((ViewportPainter)ui).paintViewport( g, (JComponent) view, (JViewport) c );
} catch( Exception ex ) {
// ignore
}
}
}
//---- interface ViewportPainter ------------------------------------------
/**
* @since 2.3
*/
public interface ViewportPainter {
void paintViewport( Graphics g, JComponent c, JViewport viewport );
}
}