Java Code Examples for javax.swing.JScrollBar#setUnitIncrement()

/**
 * Ensures that the correct maximum height is set for the popup menu and sets the scroll increment.
 * Will only take effect with the first item added. Makes sure the height is set to {@link #MAX_SHOWN_ITEMS}*itemHeight.
 *
 * @since 8.2
 */
private void ensurePopupHeight() {
	JPopupMenu popupMenu = getPopupMenu();
	if (popupMenu.getSubElements().length != 1 || !(popupMenu instanceof ScrollableJPopupMenu)) {
		return;
	}
	ScrollableJPopupMenu scrollablePopup = (ScrollableJPopupMenu) popupMenu;
	int itemHeight = scrollablePopup.getComponentsInsideScrollpane()[0].getPreferredSize().height;
	int maxHeight = MAX_SHOWN_ITEMS * itemHeight;
	maxHeight = Math.min(maxHeight, ScrollableJPopupMenu.SIZE_HUGE);
	scrollablePopup.setMaxHeight(maxHeight);
	JScrollPane scrollPane = scrollablePopup.getScrollPane();
	JScrollBar verticalScrollBar = scrollPane.getVerticalScrollBar();
	verticalScrollBar.setUnitIncrement(itemHeight);
	verticalScrollBar.setBlockIncrement(maxHeight);
}
 

private void adjustTreeScrollBar(int treeViewWidth) {
    DebugTreeView tView = getTreeView();
    if (tView == null) {
        scrollBarPanel.setVisible(false);
        return;
    }
    JViewport viewport = tView.getViewport();
    Point point = viewport.getViewPosition();
    if (point.y < 0) {
        viewport.setViewPosition(new Point(point.x, 0));
    }
    Dimension viewSize = viewport.getExtentSize();
    Dimension treeSize = viewport.getViewSize();
    if (treeViewWidth < 0) {
        treeViewWidth = treeSize.width;
    }
    int unitHeight = tView.getUnitHeight();
    if (unitHeight > 0) {
        JScrollBar sbar = mainScrollPane.getVerticalScrollBar();
        if (sbar.getUnitIncrement() != unitHeight) {
            sbar.setUnitIncrement(unitHeight);
        }
    }
    if (treeViewWidth <= viewSize.width) {
        scrollBarPanel.setVisible(false);
    } else {
        treeScrollBar.setMaximum(treeViewWidth);
        treeScrollBar.setVisibleAmount(viewSize.width);
        if (unitHeight > 0) {
            treeScrollBar.setUnitIncrement(unitHeight / 2);
        }
        treeScrollBar.setBlockIncrement(viewSize.width);
        scrollBarPanel.setVisible(true);
    } // else
}
 

/**
 * Create a bare view pane.
 * Other related entities, such as view, pixel monitor or zoom, can be added later
 * programmatically via setXXX() methods).
 * <p>
 * The increment related to mouse wheel movement can be adapted via the 'unitIncrement' class
 * constant.
 */
public ScrollView ()
{
    JScrollBar vertical = component.getVerticalScrollBar();
    vertical.setUnitIncrement(constants.unitIncrement.getValue());

    JScrollBar horizontal = component.getHorizontalScrollBar();
    horizontal.setUnitIncrement(constants.unitIncrement.getValue());

    bindKeys(component);
}
 

public static ComponentUI createUI(JComponent c)
{
	JScrollBar bar = (JScrollBar) c;
	bar.setUnitIncrement(16);
	bar.setPreferredSize(new Dimension(7, 0));
	return new CustomScrollBarUI();
}
 

public LogScrollPane(Component aView) {

            super(aView);

            final JScrollBar vscroll = getVerticalScrollBar();
            vscroll.setUnitIncrement(INCREMENT);
            vscroll.setBlockIncrement(INCREMENT);
            vscroll.addAdjustmentListener(e -> e.getAdjustable().setValue(e.getAdjustable().getMaximum()));

            setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
            setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);

            setBorder(BorderFactory.createEmptyBorder());
            getViewport().setOpaque(false);
        }
 

/**
 * Create a bare view pane.
 * Other related entities, such as view, pixel monitor or zoom, can be
 * added later programmatically via setXXX() methods).
 * <p>The increment related to mouse wheel movement can be adapted via the
 * unitIncrement class constant.
 */
public ScrollView ()
{
    JScrollBar vertical = component.getVerticalScrollBar();
    vertical.setUnitIncrement(constants.unitIncrement.getValue());
}