private void mouseMove(GwtEvent<? extends EventHandler> event) {
int[] coord = getCoordinates(event);
int x = coord[0];
int y = coord[1];
if (isMouseDown) {
// Do panning
int dx = x - previousX;
int dy = y - previousY;
if (draggableNode != null) {
WidgetStyle.setCursor(canvas, Cursor.POINTER);
double scale = canvas.getScale();
int scaleDeltaX = (int) (dx / scale);
int scaleDeltaY = (int) (dy / scale);
diagramPane.drag(draggableNode, scaleDeltaX, scaleDeltaY);
} else {
WidgetStyle.setCursor(canvas, Cursor.DEFAULT);
diagramPane.translate(dx, dy);
diagramPane.update();
}
previousX = x;
previousY = y;
isDragging = true;
} else {
diagramPane.hover(x, y);
}
}
private void hiliteAndCentreObjects(SelectionEvent e) {
if (canvas.getObjectsForRendering() == null) return;
// Un-hilight objects first
for (GraphObject obj : canvas.getObjectsForRendering()) {
obj.setHighlighted(false);
}
// Highlight the selected object and connected objects
List<GraphObject> selectedObjects = e.getSelectedObjects();
for (GraphObject obj : selectedObjects) {
if (obj instanceof Node) {
Node node = (Node) obj;
List<HyperEdge> reactions = node.getConnectedReactions();
for (HyperEdge edge : reactions) edge.setHighlighted(true);
} else if (obj instanceof HyperEdge) {
HyperEdge edge = (HyperEdge) obj;
List<Node> nodes = edge.getConnectedNodes();
for (Node node : nodes) node.setHighlighted(true);
}
if (e.isDoCentring()) {
centreObject(obj);
}
}
diagramPane.update();
}
private void centreObject(GraphObject obj) {
// Centre selected object
// PathwayCanvas c = diagramPane.getCanvas();
double scale = canvas.getScale();
Point objPos = obj.getPosition();
double objX = objPos.getX();
double objY = objPos.getY();
double x = (objX * -1.0 * scale) + (canvas.getCoordinateSpaceWidth() / 2);
double y = (objY * -1.0 * scale) + (canvas.getCoordinateSpaceHeight() / 2);
diagramPane.reset();
diagramPane.scale(scale);
diagramPane.translate(x, y, true);
diagramPane.hideTooltip();
}
private void arrowKeyUp(KeyUpEvent event) {
if (!diagramPane.getPopupMenu().isShowing()) {
int x = 0;
int y = 0;
if (event.isLeftArrow()) {
x = Parameters.MOVEX;
} else if (event.isRightArrow()) {
x = -Parameters.MOVEX;
} else if (event.isUpArrow()) {
y = Parameters.MOVEY;
} else if (event.isDownArrow()) {
y = -Parameters.MOVEY;
}
diagramPane.translate(x, y);
diagramPane.update();
}
}
private void mouseDown(GwtEvent<? extends EventHandler> event) {
int[] coord = getCoordinates(event);
previousX = coord[0];
previousY = coord[1];
isMouseDown = true;
if (canvas instanceof InteractorCanvas && draggableNode == null)
draggableNode = ((InteractorCanvas) canvas).getDraggableNode(new Point(previousX, previousY));
diagramPane.hideTooltip();
}
public void installEventHandlersForCanvas() {
installUserInputHandlers();
final OverviewCanvas overview = diagramPane.getOverview();
canvas.addHandler(diagramPane.getOverview(), ViewChangeEvent.TYPE);
// highlight linked objects
SelectionEventHandler selectionHandler =
new SelectionEventHandler() {
@Override
public void onSelectionChanged(SelectionEvent e) {
hiliteAndCentreObjects(e);
overview.setSelectedObjects(e.getSelectedObjects());
overview.update();
}
};
diagramPane.addSelectionEventHandler(selectionHandler);
}
private void mouseWheel(MouseWheelEvent event) {
if (diagramPane.getPopupMenu().isShowing() || ignoreMouseWheelEvent) return;
Timer stopIgnoringEventTimer =
new Timer() {
@Override
public void run() {
ignoreMouseWheelEvent = false;
}
};
ignoreMouseWheelEvent = true;
stopIgnoringEventTimer.schedule(250);
Point scrollPoint = new Point(event.getX(), event.getY());
if (event.getDeltaY() < 0) {
diagramPane.zoomIn(scrollPoint);
} else if (event.getDeltaY() > 0) {
diagramPane.zoomOut(scrollPoint);
}
diagramPane.update();
}
private void mouseUp(GwtEvent<? extends EventHandler> event) {
if (!isMouseDown) return;
int[] coord = getCoordinates(event);
int x = coord[0];
int y = coord[1];
isMouseDown = false;
if (isDragging) {
isDragging = false;
draggableNode = null;
WidgetStyle.setCursor(canvas, Cursor.DEFAULT);
} else { // Do click selection
// TODO: selection cannot work under iPad. Need to check touchEnd event.
diagramPane.select(event, x, y);
}
}
public void installOverviewEventHandler() {
final OverviewCanvas overview = diagramPane.getOverview();
// To catch overview dragging
ViewChangeEventHandler overviewEventHandler =
new ViewChangeEventHandler() {
@Override
public void onViewChange(ViewChangeEvent event) {
double dx = event.getTranslationEvent().getTranslateX();
double dy = event.getTranslationEvent().getTranslateY();
double scale = event.getZoomEvent().getScale();
double canvasScale = canvas.getScale();
// System.out.println("responding to overview click");
diagramPane.translate(-dx / scale * canvasScale, -dy / scale * canvasScale);
diagramPane.update();
overview.setIsFromOverview(false); // Overview Canvas can now respond to ViewChangeEvent
// now that it's own event firing has finished
}
};
overview.addHandler(overviewEventHandler, ViewChangeEvent.TYPE);
}