Bug 1488673 - part6 : remove unused functions. r=heycam

Remove those funcitons which are used to implement the previous way to move the cue box.

Differential Revision: https://phabricator.services.mozilla.com/D19610

--HG--
extra : moz-landing-system : lando

dom/media/webvtt/vtt.jsm

@@ -552,17 +552,6 @@ XPCOMUtils.defineLazyPreferenceGetter(this, "supportPseudo",
       return { top, left, width, height };
     }
 
-    move(box) {
-      this.applyStyles({
-        top: this.formatStyle(box.top, "px"),
-        bottom: this.formatStyle(box.bottom, "px"),
-        left: this.formatStyle(box.left, "px"),
-        right: this.formatStyle(box.right, "px"),
-        height: this.formatStyle(box.height, "px"),
-        width: this.formatStyle(box.width, "px")
-      });
-    }
-
     /**
      * Following methods are private functions, should not use them outside this
      * class.
@@ -881,21 +870,6 @@ XPCOMUtils.defineLazyPreferenceGetter(this, "supportPseudo",
           intersectArea = x * y;
       return intersectArea / (this.height * this.width);
     }
-
-    // Convert the positions from this box to CSS compatible positions using
-    // the reference container's positions. This has to be done because this
-    // box's positions are in reference to the viewport origin, whereas, CSS
-    // values are in referecne to their respective edges.
-    toCSSCompatValues(reference) {
-      return {
-        top: this.top - reference.top,
-        bottom: reference.bottom - this.bottom,
-        left: this.left - reference.left,
-        right: reference.right - this.right,
-        height: this.height,
-        width: this.width
-      };
-    }
   }
 
   BoxPosition.prototype.clone = function(){
@@ -1058,140 +1032,6 @@ XPCOMUtils.defineLazyPreferenceGetter(this, "supportPseudo",
     return box;
   }
 
-  // Move a StyleBox to its specified, or next best, position. The containerBox
-  // is the box that contains the StyleBox, such as a div. boxPositions are
-  // a list of other boxes that the styleBox can't overlap with.
-  function moveBoxToLinePosition(window, styleBox, containerBox, boxPositions) {
-
-    // Find the best position for a cue box, b, on the video. The axis parameter
-    // is a list of axis, the order of which, it will move the box along. For example:
-    // Passing ["+x", "-x"] will move the box first along the x axis in the positive
-    // direction. If it doesn't find a good position for it there it will then move
-    // it along the x axis in the negative direction.
-    function findBestPosition(b, axis) {
-      var bestPosition,
-          specifiedPosition = new BoxPosition(b),
-          percentage = 1; // Highest possible so the first thing we get is better.
-
-      for (var i = 0; i < axis.length; i++) {
-        while (b.overlapsOppositeAxis(containerBox, axis[i]) ||
-               (b.within(containerBox) && b.overlapsAny(boxPositions))) {
-          b.move(axis[i]);
-        }
-        // We found a spot where we aren't overlapping anything. This is our
-        // best position.
-        if (b.within(containerBox)) {
-          return b;
-        }
-        var p = b.intersectPercentage(containerBox);
-        // If we're outside the container box less then we were on our last try
-        // then remember this position as the best position.
-        if (percentage > p) {
-          bestPosition = new BoxPosition(b);
-          percentage = p;
-        }
-        // Reset the box position to the specified position.
-        b = new BoxPosition(specifiedPosition);
-      }
-      return bestPosition || specifiedPosition;
-    }
-
-    var boxPosition = new BoxPosition(styleBox),
-        cue = styleBox.cue,
-        linePos = cue.computedLine,
-        axis = [];
-
-    // If we have a line number to align the cue to.
-    if (cue.snapToLines) {
-      var size;
-      switch (cue.vertical) {
-      case "":
-        axis = [ "+y", "-y" ];
-        size = "height";
-        break;
-      case "rl":
-        axis = [ "+x", "-x" ];
-        size = "width";
-        break;
-      case "lr":
-        axis = [ "-x", "+x" ];
-        size = "width";
-        break;
-      }
-
-      var step = boxPosition.lineHeight,
-          position = step * Math.round(linePos),
-          maxPosition = containerBox[size] + step,
-          initialAxis = axis[0];
-
-      if (step == 0) {
-        return;
-      }
-
-      // If the specified intial position is greater then the max position then
-      // clamp the box to the amount of steps it would take for the box to
-      // reach the max position.
-      if (Math.abs(position) > maxPosition) {
-        position = position < 0 ? -1 : 1;
-        position *= Math.ceil(maxPosition / step) * step;
-      }
-
-      // If computed line position returns negative then line numbers are
-      // relative to the bottom of the video instead of the top. Therefore, we
-      // need to increase our initial position by the length or width of the
-      // video, depending on the writing direction, and reverse our axis directions.
-      if (linePos < 0) {
-        position += cue.vertical === "" ? containerBox.height : containerBox.width;
-        axis = axis.reverse();
-      }
-
-      // Move the box to the specified position. This may not be its best
-      // position.
-      boxPosition.move(initialAxis, position);
-
-    } else {
-      // If we have a percentage line value for the cue.
-      var calculatedPercentage = (boxPosition.lineHeight / containerBox.height) * 100;
-
-      switch (cue.lineAlign) {
-      case "center":
-        linePos -= (calculatedPercentage / 2);
-        break;
-      case "end":
-        linePos -= calculatedPercentage;
-        break;
-      }
-
-      // Apply initial line position to the cue box.
-      switch (cue.vertical) {
-      case "":
-        styleBox.applyStyles({
-          top: styleBox.formatStyle(linePos, "%")
-        });
-        break;
-      case "rl":
-        styleBox.applyStyles({
-          left: styleBox.formatStyle(linePos, "%")
-        });
-        break;
-      case "lr":
-        styleBox.applyStyles({
-          right: styleBox.formatStyle(linePos, "%")
-        });
-        break;
-      }
-
-      axis = [ "+y", "-x", "+x", "-y" ];
-
-      // Get the box position again after we've applied the specified positioning
-      // to it.
-      boxPosition = new BoxPosition(styleBox);
-    }
-
-    var bestPosition = findBestPosition(boxPosition, axis);
-    styleBox.move(bestPosition.toCSSCompatValues(containerBox));
-  }
-
   function WebVTT() {
     // Nothing
   }