Example usage for javax.swing JScrollBar getUnitIncrement

Introduction

In this page you can find the example usage for javax.swing JScrollBar getUnitIncrement.

Prototype

public int getUnitIncrement(int direction) 

Source Link

Document

Returns the amount to change the scrollbar's value by, given a unit up/down request.

Usage

From source file:Main.java

/**
 * Scrolls the given component by its unit or block increment in the given direction (actually a scale factor, so use +1 or -1).
 * Useful for implementing behavior like in Apple's Mail where page up/page down in the list cause scrolling in the text.
 *///from  w w  w  . ja v  a2s  .co  m
public static void scroll(JComponent c, boolean byBlock, int direction) {
    JScrollPane scrollPane = (JScrollPane) SwingUtilities.getAncestorOfClass(JScrollPane.class, c);
    JScrollBar scrollBar = scrollPane.getVerticalScrollBar();
    int increment = byBlock ? scrollBar.getBlockIncrement(direction) : scrollBar.getUnitIncrement(direction);
    int newValue = scrollBar.getValue() + direction * increment;
    newValue = Math.min(newValue, scrollBar.getMaximum());
    newValue = Math.max(newValue, scrollBar.getMinimum());
    scrollBar.setValue(newValue);
}

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From source file:EditorDropTarget4.java

public void autoscroll(Point location) {
    JScrollPane scroller = (JScrollPane) SwingUtilities.getAncestorOfClass(JScrollPane.class, this);
    if (scroller != null) {
        JScrollBar hBar = scroller.getHorizontalScrollBar();
        JScrollBar vBar = scroller.getVerticalScrollBar();
        Rectangle r = getVisibleRect();
        if (location.x <= r.x + scrollInsets.left) {
            // Need to scroll left
            hBar.setValue(hBar.getValue() - hBar.getUnitIncrement(-1));
        }/*from  ww w  .j  a  v a  2 s. c  o  m*/
        if (location.y <= r.y + scrollInsets.top) {
            // Need to scroll up
            vBar.setValue(vBar.getValue() - vBar.getUnitIncrement(-1));
        }
        if (location.x >= r.x + r.width - scrollInsets.right) {
            // Need to scroll right
            hBar.setValue(hBar.getValue() + hBar.getUnitIncrement(1));
        }
        if (location.y >= r.y + r.height - scrollInsets.bottom) {
            // Need to scroll down
            vBar.setValue(vBar.getValue() + vBar.getUnitIncrement(1));
        }
    }
}

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From source file:net.sf.jabref.gui.maintable.MainTable.java

public void scrollTo(int y) {
    JScrollBar scb = pane.getVerticalScrollBar();
    scb.setValue(y * scb.getUnitIncrement(1));
}

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