MapCanvas.java 文件源码

/**
 * Creates a new {@link MapCanvas}.
 * 
 * @param repProc replay processor
 * @param zoomComboBox combo box which tells how to zoom the map image
 */
public MapCanvas( final RepProcessor repProc, final XComboBox< Zoom > zoomComboBox ) {
    this.repProc = repProc;
    this.zoomComboBox = zoomComboBox;

    ricon = MapImageCache.getMapImage( repProc );

    GuiUtils.makeComponentDragScrollable( this );

    // Zoom in and out with CTRL+wheel scroll:
    addMouseWheelListener( new MouseWheelListener() {
        @Override
        public void mouseWheelMoved( final MouseWheelEvent event ) {
            if ( event.isControlDown() ) {
                final int newZoomIdx = zoomComboBox.getSelectedIndex() - event.getWheelRotation();
                zoomComboBox.setSelectedIndex( Math.max( 0, Math.min( zoomComboBox.getItemCount() - 1, newZoomIdx ) ) );
                // An event will be fired which will cause reconfigureZoom() to be called...
            }
        }
    } );
}