cinera.web: Fix player sizing and auto-scrolling

• Video size may be based on the height if the width-based is too tall
• Auto-scrolling improvements:
    • It now cannot oscillate
    • It doesn't happen at all if scrolled to the very top / bottom

Thanks to @Freak_ on freenode for the report

cinera/cinera.c

@@ -23,7 +23,7 @@ typedef struct
 version CINERA_APP_VERSION = {
     .Major = 0,
     .Minor = 8,
-    .Patch = 5
+    .Patch = 6
 };
 
 #include <stdarg.h> // NOTE(matt): varargs

cinera/cinera_player_post.js

@@ -50,7 +50,7 @@ var CineraProps = {
     FlexDirection: null,
     JustifyContent: null,
     O: null,
-    D: IsMobile() ? devices.MOBILE : devices.DESKTOP,
+    IsMobile: IsMobile(),
     ScrollX: null,
     ScrollY: null,
 };
@@ -173,7 +173,7 @@ if(titleBar)
     }
 
     viewsMenu = titleBar.querySelector(".views");
-    if(viewsMenu && CineraProps.D !== devices.MOBILE)
+    if(viewsMenu && !CineraProps.IsMobile)
     {
         menuState.push(viewsMenu);
         var viewsContainer = viewsMenu.querySelector(".views_container");
@@ -280,7 +280,7 @@ var MobileCineraContentRule = GetOrSetRule(MobileCineraContentRuleSelector);
 var MenuContainerRuleSelector = ".cineraMenus > .menu .quotes_container, .cineraMenus > .menu .references_container, .cineraMenus > .menu .filter_container, .cineraMenus > .menu .views_container, .cineraMenus > .menu .link_container, .cineraMenus > .menu .credits_container";
 var MenuContainerRule = GetOrSetRule(MenuContainerRuleSelector);
 
-if(CineraProps.D == devices.MOBILE)
+if(CineraProps.IsMobile)
 {
     InitMobileStyle();
 }
@@ -292,7 +292,7 @@ else
 
 var player = new Player(playerContainer, onRefChanged);
 
-if(CineraProps.D == devices.MOBILE)
+if(CineraProps.IsMobile)
 {
     ConnectMobileControls(player);
 }

cinera/cinera_player_pre.js

@@ -483,13 +483,21 @@ Player.prototype.updateSize = function() {
     var width = 0;
     var height = 0;
     CineraProps.O = GetRealOrientation(orientations.LANDSCAPE_LEFT, CineraProps.IsMobile);
-    if(CineraProps.D === devices.DESKTOP)
+    if(!CineraProps.IsMobile)
     {
+        var VisibleArea = GetWindowDim(false);
+        var AvailableHeight = VisibleArea.Y - titleBar.offsetHeight;
         width = this.videoContainer.offsetWidth;
         height = width / 16 * 9; // TODO(matt): Get the aspect ratio from the video itself?
+        if(height > AvailableHeight)
+        {
+            height = AvailableHeight;
+            width = height / 9 * 16;
+        }
         this.markersContainer.style.height = height + "px";
 
-        var MenuMaxHeight = cinera.offsetHeight - titleBar.offsetHeight - 4;
+        var VacantPixelsBelowMenus = 4;
+        var MenuMaxHeight = cinera.offsetHeight - titleBar.offsetHeight - VacantPixelsBelowMenus;
         MenuContainerRule.style.maxHeight = MenuMaxHeight + "px";
     }
     else

cinera/cinera_pre.js

@@ -44,22 +44,30 @@ DeriveReliableWindowDimensions()
 }
 
 function
-GetRealOrientation(PreferredLandscape, IsMobile)
+GetWindowDim(IsMobile)
 {
-    var Result = window.orientation;
+    var Result = {
-    var WindowDim = {
         X: null,
         Y: null,
     };
+
     if(IsMobile)
     {
-        WindowDim = DeriveReliableWindowDimensions();
+        Result = DeriveReliableWindowDimensions();
     }
     else
     {
-        WindowDim.X = document.body.clientWidth;
+        Result.X = document.body.clientWidth;
-        WindowDim.Y = window.innerHeight;
+        Result.Y = window.innerHeight;
     }
+    return Result;
+}
+
+function
+GetRealOrientation(PreferredLandscape, IsMobile)
+{
+    var Result = window.orientation;
+    var WindowDim = GetWindowDim(IsMobile);
     if(WindowDim.Y > WindowDim.X)
     {
         Result = orientations.PORTRAIT;
@@ -262,42 +270,62 @@ GetOrSetRule(SelectorText)
     return Result;
 }
 
+function IsInRangeEx(Min, N, Max)
+{
+    return N > Min && N < Max;
+}
+
 /* Auto-scrolling */
 var LastScrollYPos = 0;
 var ScrollTicking = false;
 var ScrollerFunction;
 var ScrollCondition;
 
-function ScrollTo(Element, ScrollPos, StickyObscuringElement) {
+function ScrollTo(Element, ScrollPos, IsMobile, StickyObscuringElement) {
+    var ScrolledToTop = ScrollPos == 0;
+    var ScrolledToBottom = (window.innerHeight + Math.ceil(window.pageYOffset)) >= document.body.scrollHeight;
+    if(!ScrolledToTop || !ScrolledToBottom)
+    {
+        var Ceiling = StickyObscuringElement ? StickyObscuringElement.offsetHeight : 0;
+        var VisibleArea = GetWindowDim(IsMobile);
+        VisibleArea.Y -= Ceiling;
+
+        var PercentageOfVisibleHeightToGather = 5;
+        var GatherableHeight = VisibleArea.Y * PercentageOfVisibleHeightToGather / 100;
+
         var BoundingRect = Element.getBoundingClientRect();
-    var Height = BoundingRect.height;
+
-    var PercentageOfInView = 89;
+        var ElementTop = BoundingRect.top - Ceiling;
-    var GatherableHeight = Height * (1 - PercentageOfInView / 100);
+        var ElementBottom = ElementTop + BoundingRect.height;
-    var ScrollY = BoundingRect.top;
+
-    var YOffsetFromPage = getElementYOffsetFromPage(Element);
+        var UpperProtrusion = -ElementTop;
+        var LowerProtrusion = ElementBottom - VisibleArea.Y;
 
         var DesiredScroll = null;
-    var Ceiling = StickyObscuringElement ? StickyObscuringElement.offsetHeight : 0;
+        var YOffsetFromPage = getElementYOffsetFromPage(Element);
-
+        if(IsInRangeEx(0, UpperProtrusion, GatherableHeight))
-    if(ScrollY < Ceiling)
         {
-        if(ScrollY < 0) { ScrollY = -ScrollY; }
+            if(!ScrolledToBottom)
-        GatherableHeight -= Ceiling;
-        if(ScrollY <= GatherableHeight)
             {
                 DesiredScroll = YOffsetFromPage - Ceiling;
             }
         }
-    else
+        else if(IsInRangeEx(0, LowerProtrusion, GatherableHeight))
         {
-        var LowerProtrusion = ScrollY - (window.innerHeight - Height);
+            if(!ScrolledToTop)
-        if(LowerProtrusion > 0 && LowerProtrusion <= GatherableHeight)
+            {
+                if(IsInRangeEx(0, UpperProtrusion + LowerProtrusion, GatherableHeight))
+                {
+                    DesiredScroll = YOffsetFromPage - Ceiling;
+                }
+                else
                 {
                     DesiredScroll = ScrollPos + LowerProtrusion;
                 }
             }
+        }
 
-    if(DesiredScroll !== null)
+        if(DesiredScroll !== null && DesiredScroll != ScrollPos)
         {
             window.scrollTo({
                 top: DesiredScroll,
@@ -305,9 +333,10 @@ function ScrollTo(Element, ScrollPos, StickyObscuringElement) {
             });
         }
     }
+}
 
 function
-InitScrollEventListener(Element, StickyObscuringElement)
+InitScrollEventListener(Element, IsMobile, StickyObscuringElement)
 {
     window.addEventListener('scroll', function() {
         if(ScrollCondition == undefined || ScrollCondition == true)
@@ -317,7 +346,7 @@ InitScrollEventListener(Element, StickyObscuringElement)
             if (!ScrollTicking) {
                 window.requestAnimationFrame(function() {
                     clearTimeout(ScrollerFunction);
-                    ScrollerFunction = setTimeout(ScrollTo, 2000, Element, LastScrollYPos, StickyObscuringElement);
+                    ScrollerFunction = setTimeout(ScrollTo, 2000, Element, LastScrollYPos, IsMobile, StickyObscuringElement);
                     ScrollTicking = false;
                 });
 

cinera/cinera_search_pre.js

@@ -2938,19 +2938,7 @@ ComputeOptimalGridSize()
         Y: null,
     };
 
-    var WindowDim = {
+    var WindowDim = GetWindowDim(CineraProps.IsMobile);
-        X: null,
-        Y: null,
-    };
-    if(CineraProps.IsMobile)
-    {
-        WindowDim = DeriveReliableWindowDimensions();
-    }
-    else
-    {
-        WindowDim.X = document.body.clientWidth;
-        WindowDim.Y = window.innerHeight;
-    }
     var DimReduction = {
         X: 0,
         Y: Nav.Controls.Header.offsetHeight,