Java Utililty Methods JScrollPane

List of utility methods to do JScrollPane

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Description

The list of methods to do JScrollPane are organized into topic(s).

Method

voidscrollToTop(final JScrollPane scrollPane)
Scrolls scroll pane to the top left corner. 
JScrollBar verticalScrollBar = scrollPane.getVerticalScrollBar();
JScrollBar horizontalScrollBar = scrollPane.getHorizontalScrollBar();
verticalScrollBar.setValue(verticalScrollBar.getMinimum());
horizontalScrollBar.setValue(horizontalScrollBar.getMinimum());
voidscrollToTop(JScrollPane scrollPane)
scroll To Top 
final JScrollBar verticalScrollBar = scrollPane.getVerticalScrollBar();
verticalScrollBar.setValue(verticalScrollBar.getMinimum());
voidscrollToTopLater(final JScrollPane scrollPane)
Scrolls scroll pane to the top left corner a bit later. 
SwingUtilities.invokeLater(new Runnable() {
    public void run() {
        scrollToTop(scrollPane);
});
voidscrollToVisible(Component comp, JScrollPane parent)
Scrolls a component to the view position of a scrollpane if necessary 
Point p0 = parent.getViewport().getViewPosition();
Point p1 = comp.getLocation();
Rectangle r0 = parent.getViewport().getBounds();
Rectangle r1 = comp.getBounds();
if (p0.x > p1.x || p0.y > p1.y || (p0.x < p1.x && (p0.x + r0.width < p1.x + r1.width))
        || (p0.y < p1.y && (p0.y + r0.height < p1.y + r1.height)))
    parent.getViewport().setViewPosition(comp.getBounds().getLocation());
voidsetDefaultScrollbarUnits(JScrollPane scrollPane)
Set reasonable unit increments for a scroll pane that does not contain a Scrollable. 
int unit = new JLabel().getFont().getSize() * 2;
scrollPane.getHorizontalScrollBar().setUnitIncrement(unit);
scrollPane.getVerticalScrollBar().setUnitIncrement(unit);
voidsetScrollpane(JScrollPane scrollpane)
OS X shows scrollpanes even if there is no data to scroll. 
scrollpane.setHorizontalScrollBarPolicy(Integer.parseInt(System.getProperty("scrollbar.horizontal")));
scrollpane.setVerticalScrollBarPolicy(Integer.parseInt(System.getProperty("scrollbar.vertical")));
voidsetScrollPaneSize(JScrollPane scrollPane, int rows, int columns)
set Scroll Pane Size 
final Component view = scrollPane.getViewport().getView();
final FontMetrics fontMetrics = view.getFontMetrics(view.getFont());
final int width = fontMetrics.charWidth('m') * columns;
scrollPane.setPreferredSize(new Dimension(width, fontMetrics.getHeight() * rows));
voidsetUnitIncrement(JScrollPane scroller)
set Unit Increment 
scroller.getVerticalScrollBar().setUnitIncrement(20);
scroller.getHorizontalScrollBar().setUnitIncrement(20);
JFrameshow(JComponent comp, String windowName, boolean hasScrollBars, int x, int y, int width, int height)
show 
JFrame frame = new JFrame(windowName);
frame.setLocation(x, y);
if (hasScrollBars) {
    JScrollPane scroll = new JScrollPane(comp);
    frame.add(scroll, BorderLayout.CENTER);
} else {
    frame.add(comp, BorderLayout.CENTER);
frame.setSize(width, height);
frame.setVisible(true);
return frame;
PointtoScrollPane(Component component, Point componentPoint, Point resultPoint)
to Scroll Pane 
int px = componentPoint.x;
int py = componentPoint.y;
while (!(component instanceof JScrollPane)) {
    px += component.getX();
    py += component.getY();
    component = component.getParent();
if (resultPoint == null) {
...