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package com.explodingpixels.widgets;
import javax.swing.JTable;
import javax.swing.JViewport;
import javax.swing.border.AbstractBorder;
import javax.swing.table.TableColumn;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
/**
* Creates a border for a {@link JViewport} that draws a striped background corresponding to the row
* positions of the given {@link JTable}.
*/
class StripedViewportBorder extends AbstractBorder {
private final JViewport fViewport;
private final JTable fTable;
private final Color fStripeColor;
StripedViewportBorder(JViewport viewport, JTable table, Color stripeColor) {
fViewport = viewport;
fTable = table;
fStripeColor = stripeColor;
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
paintStripedBackground(g);
paintVerticalGridLines(g, y, height);
}
private void paintStripedBackground(Graphics g) {
// get the row index at the top of the clip bounds (the first row
// to paint).
Rectangle clip = g.getClipBounds();
Point viewPosition = fViewport.getViewPosition();
// TODO figure out how to honor the beginning of clip region.
// Point viewPostionWithClip = new Point(viewPosition.x + clip.x, viewPosition.y + clip.y);
int rowAtPoint = fTable.rowAtPoint(viewPosition);
// get the y coordinate of the first row to paint. if there are no
// rows in the table, start painting at the top of the supplied
// clipping bounds.
int topY = rowAtPoint < 0
? clip.y
: fTable.getCellRect(rowAtPoint, 0, true).y - viewPosition.y;
// create a counter variable to hold the current row. if there are no
// rows in the table, start the counter at 0.
int currentRow = rowAtPoint < 0 ? 0 : rowAtPoint;
while (topY < clip.y + clip.height) {
int bottomY = topY + fTable.getRowHeight();
g.setColor(getRowColor(currentRow));
g.fillRect(clip.x, topY, clip.width, bottomY);
topY = bottomY;
currentRow++;
}
}
private Color getRowColor(int row) {
return row % 2 == 0 ? fStripeColor : fTable.getBackground();
}
private void paintVerticalGridLines(Graphics g, int y, int height) {
// paint the column grid dividers for the non-existent rows.
int x = 0 - fViewport.getViewPosition().x;
for (int i = 0; i < fTable.getColumnCount(); i++) {
TableColumn column = fTable.getColumnModel().getColumn(i);
// increase the x position by the width of the current column.
x += column.getWidth();
g.setColor(fTable.getGridColor());
// draw the grid line (not sure what the -1 is for, but BasicTableUI
// also does it.source
g.drawLine(x - 1, y, x - 1, y + height);
}
}
}
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