/**
* Cancels automatic block scrolling.
*
* @param component The scroll bar.
* @param button The button that was released.
* @param x The x-coordinate of the event in the scroll bar's coordinate space.
* @param y The y-coordinate of the event in the scroll bar's coordinate space.
*/
@Override
public boolean mouseUp(Component component, Mouse.Button button, int x, int y) {
boolean consumed = super.mouseUp(component, button, x, y);
if (button == Mouse.Button.LEFT) {
automaticScroller.stop();
}
return consumed;
}
/**
* Initiates automatic block scrolling. This only happens if the handle is visible since whether
* the user clicked before or after the handle determines the direction of the scrolling.
*
* @param component The scroll bar.
* @param button The button that was pressed.
* @param x The x-coordinate of the event in the scroll bar's coordinate space.
* @param y The y-coordinate of the event in the scroll bar's coordinate space.
*/
@Override
public boolean mouseDown(Component component, Mouse.Button button, int x, int y) {
boolean consumed = super.mouseDown(component, button, x, y);
if (button == Mouse.Button.LEFT && handle.isVisible()) {
ScrollBar scrollBar = (ScrollBar) getComponent();
// Begin automatic block scrolling. Calculate the direction of
// the scroll by checking to see if the user pressed the mouse
// in the area "before" the handle or "after" it.
int direction;
int realStopValue;
if (scrollBar.getOrientation() == Orientation.HORIZONTAL) {
direction = x < handle.getX() ? -1 : 1;
int pixelStopValue = x - scrollUpButton.getWidth() + 1;
if (direction == 1) {
// If we're scrolling down, account for the width of the
// handle in our pixel stop value so that we stop as soon
// as the *bottom* of the handle reaches our click point
pixelStopValue -= handle.getWidth();
}
realStopValue = (int) (pixelStopValue / getValueScale());
} else {
direction = y < handle.getY() ? -1 : 1;
int pixelStopValue = y - scrollUpButton.getHeight() + 1;
if (direction == 1) {
// If we're scrolling down, account for the height of the
// handle in our pixel stop value so that we stop as soon
// as the *bottom* of the handle reaches our click point
pixelStopValue -= handle.getHeight();
}
realStopValue = (int) (pixelStopValue / getValueScale());
}
// Start the automatic scroller
automaticScroller.start(direction, Mouse.ScrollType.BLOCK, realStopValue);
consumed = true;
}
return consumed;
}
@Override
public void mouseOut(Component component) {
super.mouseOut(component);
automaticScroller.stop();
}
