protected void addMouseHandlers() {
// To record the original position
MouseDownHandler mouseDownHandler =
new MouseDownHandler() {
@Override
public void onMouseDown(MouseDownEvent event) {
event.stopPropagation();
if (event.getNativeEvent().getButton() == NativeEvent.BUTTON_LEFT) mouseDown(event);
}
};
MouseMoveHandler mouseMoveHandler =
new MouseMoveHandler() {
@Override
public void onMouseMove(MouseMoveEvent event) {
event.stopPropagation();
mouseMove(event);
}
};
MouseUpHandler mouseUpHandler =
new MouseUpHandler() {
@Override
public void onMouseUp(MouseUpEvent event) {
event.stopPropagation();
mouseUp(event);
}
};
MouseOutHandler mouseOutHandler =
new MouseOutHandler() {
@Override
public void onMouseOut(MouseOutEvent event) {
event.stopPropagation();
mouseOut(event);
}
};
MouseWheelHandler mouseWheelHandler =
new MouseWheelHandler() {
@Override
public void onMouseWheel(MouseWheelEvent event) {
event.stopPropagation();
event.preventDefault();
mouseWheel(event);
}
};
DoubleClickHandler doubleClickHandler =
new DoubleClickHandler() {
@Override
public void onDoubleClick(DoubleClickEvent event) {
event.stopPropagation();
doubleClick(event);
}
};
canvas.addMouseDownHandler(mouseDownHandler);
canvas.addMouseUpHandler(mouseUpHandler);
canvas.addMouseMoveHandler(mouseMoveHandler);
canvas.addMouseOutHandler(mouseOutHandler);
canvas.addMouseWheelHandler(mouseWheelHandler);
canvas.addDoubleClickHandler(doubleClickHandler);
}
