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Popup: make sure that popup background is filled (issue #94)

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Karl Tauber
2020-05-09 23:23:12 +02:00
parent ceba3e2f95
commit 06cad7ecd8
1 changed files with 46 additions and 0 deletions
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46
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupFactory.java
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@@ -20,6 +20,8 @@ import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Window;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
@@ -133,6 +135,7 @@ public class FlatPopupFactory
window = SwingUtilities.windowForComponent( contents );
if( window != null ) {
oldBackground = window.getBackground();
parent.setBorder( new FillBackgroundBorder( parent.getBorder(), oldBackground ) );
window.setBackground( new Color( 0, true ) );
window.setSize( window.getPreferredSize() );
} else
@@ -165,4 +168,47 @@ public class FlatPopupFactory
delegate = null;
}
}
//---- class FillBackgroundBorder -----------------------------------------
/**
* Fills the component background with the given color (and delegates border painting).
* This avoids that underlying windows may shine thru which may happen because
* the heavy weight popup window is transparent and the contained panel is not opaque.
*/
private static class FillBackgroundBorder
implements Border
{
private final Border delegate;
private final Color background;
FillBackgroundBorder( Border delegate, Color background ) {
this.delegate = delegate;
this.background = background;
}
@Override
public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
Insets insets = getBorderInsets( c );
Color oldColor = g.getColor();
g.setColor( background );
g.fillRect( x + insets.left, y + insets.top,
width - insets.left - insets.right, height - insets.top - insets.bottom );
// restore color because delegate border may use it
g.setColor( oldColor );
delegate.paintBorder( c, g, x, y, width, height );
}
@Override
public Insets getBorderInsets( Component c ) {
return delegate.getBorderInsets( c );
}
@Override
public boolean isBorderOpaque() {
return delegate.isBorderOpaque();
}
}
}