package org.timepedia.chronoscope.client.browser.event;
import com.google.gwt.event.dom.client.MouseMoveEvent;
import com.google.gwt.event.dom.client.MouseMoveHandler;
import org.timepedia.chronoscope.client.Chart;
import org.timepedia.chronoscope.client.Cursor;
import org.timepedia.chronoscope.client.Overlay;
import org.timepedia.chronoscope.client.XYPlot;
import org.timepedia.chronoscope.client.event.ChartDragEvent;
import org.timepedia.chronoscope.client.event.ChartDragStartEvent;
/**
* Handles the event where the mouse is moved within the chart area.
*
* @author Chad Takahashi
*/
public final class ChartMouseMoveHandler
extends AbstractEventHandler<MouseMoveHandler> implements MouseMoveHandler {
public void onMouseMove(MouseMoveEvent event) {
ChartState chartInfo = getChartState(event);
Chart chart = chartInfo.chart;
XYPlot plot = chart.getPlot();
int x = getLocalX(event);
int y = getLocalY(event);
CompoundUIAction uiAction = chartInfo.getCompoundUIAction();
if (uiAction.isSelecting(plot)) {
chart.setAnimating(true);
plot.setHighlight(uiAction.getStartX(), x);
} else if (uiAction.getSource() != null && uiAction
.isDragging(uiAction.getSource())) {
int dragThd = uiAction.isDragStarted(plot) ? 1
: (uiAction.getSource() instanceof Overlay ? 5 : 10);
boolean dragThresholdReached = Math.abs(uiAction.getStartX() - x)
> dragThd;
if (dragThresholdReached) {
if (uiAction.getSource() instanceof Overlay) {
if (!uiAction.isDragStarted(plot)) {
plot.fireEvent(new ChartDragStartEvent(plot, x));
uiAction.setDragStarted(true);
uiAction.setDragStartX(uiAction.getStartX());
}
((Overlay) uiAction.getSource()).fire(new ChartDragEvent(plot, x));
chart.setHover(x,y);
} else {
chart.setAnimating(true);
chart.scrollPixels(uiAction.getStartX() - x);
}
uiAction.setStartX(x);
event.stopPropagation();
event.preventDefault();
}
} else if ((null != plot) && (null != plot.getBounds()) && (plot.getBounds().inside(x, y))) {
if (chart.setHover(x, y)) {
chart.setCursor(Cursor.CLICKABLE);
} else {
chart.setCursor(Cursor.DRAGGABLE);
}
}
chartInfo.setHandled(true);
}
}