c2c780666cf30f764fe4eb81b7fad350b0a7391a
kate
  Thu Mar 8 15:56:39 2018 -0800
Add trackDb setting to indicate if there is a direction to the interaction (interactDirectional). refs #17512

diff --git src/hg/lib/interactUi.c src/hg/lib/interactUi.c
index 1a0d231..faf1217 100644
--- src/hg/lib/interactUi.c
+++ src/hg/lib/interactUi.c
@@ -32,32 +32,47 @@
 /* Input box to change track height */
 {
 // track height control
 char buffer[1024];      
 int min, max, deflt, current;
 cartTdbFetchMinMaxPixels(cart, tdb, INTERACT_MINHEIGHT, INTERACT_MAXHEIGHT, 
                                 atoi(INTERACT_DEFHEIGHT),
                                 &min, &max, &deflt, &current);
 safef(buffer, sizeof buffer, "%s.%s", track, INTERACT_HEIGHT);
 printf("<br><b>Track height:&nbsp;</b>");
 cgiMakeIntVar(buffer, current, 3);
 printf("&nbsp;<span>pixels&nbsp;(range: %d to %d, default: %d)<span>",
         min, max, deflt);
 }
 
+boolean interactUiDirectional(struct trackDb *tdb)
+/* Determine if interactions are directional */
+{
+boolean isDirectional = FALSE;
+char *setting = trackDbSettingClosestToHome(tdb, INTERACT_DIRECTIONAL);
+if (setting == NULL)
+    errAbort("interact track %s missing required %s setting\n", tdb->track, INTERACT_DIRECTIONAL);
+if (sameString(setting, "true"))
+    isDirectional = TRUE;
+else if (differentString(setting, "false"))
+    errAbort("interact track %s setting %s must be set true or false\n", 
+                tdb->track, INTERACT_DIRECTIONAL);
+return isDirectional;
+}
+
 void interactCfgUi(char *database, struct cart *cart, struct trackDb *tdb, char *track,
                         char *title, boolean boxed)
-/* Bar chart track type */
+/* Configure interact track type */
 {
 if (cartVarExists(cart, "ajax"))
     isPopup = TRUE;
 boxed = cfgBeginBoxAndTitle(tdb, boxed, title);
 if (startsWith("big", tdb->type))
     labelCfgUi(database, cart, tdb);
 //printf("\n<table id=interactControls style='font-size:%d%%' %s>\n<tr><td>",
         //isPopup ? 75 : 100, boxed ?" width='100%'":"");
 interactUiTrackHeight(cart, track, tdb);
 puts("<div>");
 interactUiDrawMode(cart, track, tdb);
 //puts("\n</table>\n");
 cfgEndBox(boxed);
 }