messagegui: wip messagescroller2

Author: thyttan

apps/messagegui/app.js

@@ -278,9 +278,9 @@ function showMessageScroller2(msg, initAtEndOfMsg, persist, alreadyProcessed) {
   if (initAtEndOfMsg===undefined) {initAtEndOfMsg = false;}
   if (persist===undefined) {persist = true;}
   if (!!alreadyProcessed) {
-    alreadyProcessed = {};
-    alreadyProcessed.lines = [];
-    alreadyProcessed.idxSpan = [];
+    alreadyProcessed = { lines : [], idxSpan : [] };
+    //alreadyProcessed.lines = [];
+    //alreadyProcessed.idxSpan = [];
   }
 
   if (replying) { return; }
@@ -292,18 +292,18 @@ function showMessageScroller2(msg, initAtEndOfMsg, persist, alreadyProcessed) {
 
   let msgIdx = MESSAGES.findIndex((m) =>  m.id == msg.id)
   //print("msgIdx",msgIdx);
-  let startIdx;
-  let stopIdx;
+  let startIdx = 0;
+  let stopIdx = 0;
 
   if (alreadyProcessed.idxSpan.length===0){
     startIdx = Math.max(msgIdx-1, 0);
     stopIdx = Math.min(msgIdx+2, MESSAGES.length);
-  } else if (msgIdx > alreadyProcessed.idxSpan[0] && msgid < alreadyProcessed.idxSpan[1]){
-    startIdx = msgIdx;
-    stopIdx = msgIdx+1;
-  } else {
-    startIdx = msgIdx;
-    stopIdx = msgIdx;
+  } else if (msgIdx < alreadyProcessed.startIdx) {
+    startIdx = Math.max(msgIdx, 0);
+    stopIdx = alreadyProcessed.startIdx;
+  } else if (msgid >= alreadyProcessed.stopIdx){
+    startIdx = alreadyProcessed.stopIdx;
+    stopIdx = Math.min(msgIdx, MESSAGES.length);
   }
 
   active = "scroller";
@@ -359,6 +359,14 @@ function showMessageScroller2(msg, initAtEndOfMsg, persist, alreadyProcessed) {
   //print("allLines2:\n",allLines2);
   //print("messagesWrapped:\n",messagesWrapped);
 
+  let cacheObj = { 
+    lines : allLines2,
+    startIdx : Math.min(startIdx, alreadyProcessed.startIdx),
+    stopIdx : Math.max(stopIdx, alreadyProcessed.stopIdx),
+    titleLines : titleLines,
+    messagesWrappedLength : messagesWrapped.length,
+  };
+
   E.showScroller({
     scroll : initScroll*g.getFontHeight(),
     h : g.getFontHeight(), // height of each menu item in pixels
@@ -373,12 +381,12 @@ function showMessageScroller2(msg, initAtEndOfMsg, persist, alreadyProcessed) {
       g.setFont(bodyFont).setFontAlign(0,-1).drawString(allLines2[idx], r.x+r.w/2, r.y);
       if (idx>=allLines2.length-1 && msgIdx<MESSAGES.length-1) {
         setTimeout(()=>{
-          showMessageScroller2(MESSAGES[msgIdx+1], true);
+          showMessageScroller2(MESSAGES[msgIdx+1], true, cacheObj);
         }, 0)
       }
       if (idx==0 && msgIdx>0) {
         setTimeout(()=>{
-          showMessageScroller2(MESSAGES[msgIdx-1], false);
+          showMessageScroller2(MESSAGES[msgIdx-1], false, cacheObj);
         }, 0)
       }
     }, select : function(idx, touch) {