Example usage for com.google.gwt.user.client.ui MouseWheelListener MouseWheelListener

Introduction

In this page you can find the example usage for com.google.gwt.user.client.ui MouseWheelListener MouseWheelListener.

Prototype

MouseWheelListener

Source Link

Usage

From source file:org.vectomatic.client.rep.view.DrawingView.java

License:Open Source License

public DrawingView(RepresentationController repController, DrawingModel model, int width, int height) {
    super(width, height);
    saveContext();/*from  w ww .j a  va2s .co m*/
    _t = new Point();
    _s = new Point(Point.UNIT);
    _m = new TransformMatrix();

    _repController = repController;
    _model = model;
    _mInv = new TransformMatrix();
    _compass = new Compass(this);
    _compass.setPosition(new Point(width - 70, 50));
    _compass.setRadius(45);
    _renderer = new RenderVisitor(this);
    _picker = new PickVisitor(this);
    addMouseListener(new MouseListenerAdapter() {
        Point p = new Point();

        @Override
        public void onMouseDown(Widget sender, int x, int y) {
            p.x = x;
            p.y = y;
            //RepApplication.app.debugArea.setText(toModelCoordinates(p, new Point()).toString());
            if (_compass.pick(p) != Compass.NONE) {
                _compassMode = true;
                _compass.mouseDown(p);
            } else {
                _compassMode = false;
                //p.transform(_mInv);
                RepApplication.app.debugPrint("x=" + p.x + " y=" + p.y);
                _controller.mouseDown(DrawingView.this, p, modifiers);
            }
        }

        @Override
        public void onMouseMove(Widget sender, int x, int y) {
            p.x = x;
            p.y = y;
            if (_compassMode) {
                _compass.mouseMove(p);
            } else {
                _compass.pick(p);
                //p.transform(_mInv);
                _controller.mouseMove(DrawingView.this, p, modifiers);
            }
        }

        @Override
        public void onMouseUp(Widget sender, int x, int y) {
            p.x = x;
            p.y = y;
            if (_compassMode) {
                _compass.mouseUp();
                _compassMode = false;
            } else {
                //p.transform(_mInv);
                _controller.mouseUp(DrawingView.this, p, modifiers);
            }
        }
    });
    addKeyboardListener(new KeyboardListener() {
        public void onKeyDown(Widget sender, char keyCode, int modifiers) {
            _controller.keyDown(DrawingView.this, keyCode, modifiers);
        }

        public void onKeyPress(Widget sender, char keyCode, int modifiers) {
            _controller.keyPress(DrawingView.this, keyCode, modifiers);
        }

        public void onKeyUp(Widget sender, char keyCode, int modifiers) {
            _controller.keyUp(DrawingView.this, keyCode, modifiers);
        }
    });
    addMouseWheelListener(new MouseWheelListener() {
        Point p = new Point();

        public void onMouseWheel(Widget sender, MouseWheelVelocity velocity) {
            int delta = 10 * velocity.getDeltaY();
            if ((modifiers & KeyboardListener.MODIFIER_CTRL) != 0) {
                if (delta > 0) {
                    float s = _compass.getScaling();
                    _compass.setScaling(s + 0.1f * (1 - s));
                } else {
                    float s = _compass.getScaling();
                    _compass.setScaling(s - 0.1f * s);
                }
            } else {
                if ((modifiers & KeyboardListener.MODIFIER_ALT) != 0) {
                    p.x = delta;
                    p.y = 0f;
                } else {
                    p.x = 0f;
                    p.y = delta;
                }
                _compass.translate(p);
            }
        }
    });
}

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