/**
* Listen for events that will move the knob.
*
* @param event the event that occurred
*/
@Override
public void onBrowserEvent(Event event) {
super.onBrowserEvent(event);
if (enabled) {
switch (DOM.eventGetType(event)) {
// Unhighlight and cancel keyboard events
case Event.ONBLUR:
keyTimer.cancel();
if (slidingMouse) {
DOM.releaseCapture(getElement());
slidingMouse = false;
slideKnob(event);
stopSliding(true, true);
} else if (slidingKeyboard) {
slidingKeyboard = false;
stopSliding(true, true);
}
unhighlight();
break;
// Highlight on focus
case Event.ONFOCUS:
highlight();
break;
// Mousewheel events
case Event.ONMOUSEWHEEL:
int velocityY = DOM.eventGetMouseWheelVelocityY(event);
DOM.eventPreventDefault(event);
if (velocityY > 0) {
shiftRight(1);
} else {
shiftLeft(1);
}
break;
// Shift left or right on key press
case Event.ONKEYDOWN:
if (!slidingKeyboard) {
int multiplier = 1;
if (DOM.eventGetCtrlKey(event)) {
multiplier = (int) (getTotalRange() / stepSize / 10);
}
switch (DOM.eventGetKeyCode(event)) {
case KeyCodes.KEY_HOME:
DOM.eventPreventDefault(event);
setCurrentValue(minValue);
break;
case KeyCodes.KEY_END:
DOM.eventPreventDefault(event);
setCurrentValue(maxValue);
break;
case KeyCodes.KEY_LEFT:
DOM.eventPreventDefault(event);
slidingKeyboard = true;
startSliding(false, true);
shiftLeft(multiplier);
keyTimer.schedule(400, false, multiplier);
break;
case KeyCodes.KEY_RIGHT:
DOM.eventPreventDefault(event);
slidingKeyboard = true;
startSliding(false, true);
shiftRight(multiplier);
keyTimer.schedule(400, true, multiplier);
break;
case 32:
DOM.eventPreventDefault(event);
setCurrentValue(minValue + getTotalRange() / 2);
break;
}
}
break;
// Stop shifting on key up
case Event.ONKEYUP:
keyTimer.cancel();
if (slidingKeyboard) {
slidingKeyboard = false;
stopSliding(true, true);
}
break;
// Mouse Events
case Event.ONMOUSEDOWN:
setFocus(true);
slidingMouse = true;
DOM.setCapture(getElement());
startSliding(true, true);
DOM.eventPreventDefault(event);
slideKnob(event);
break;
case Event.ONMOUSEUP:
if (slidingMouse) {
DOM.releaseCapture(getElement());
slidingMouse = false;
slideKnob(event);
stopSliding(true, true);
}
break;
case Event.ONMOUSEMOVE:
if (slidingMouse) {
slideKnob(event);
}
break;
}
}
}
