[polymer] import all elements

pkg/polymer/lib/elements/polymer-grid-layout/polymer-grid-layout.html

+<link rel="import" href="../polymer/polymer.html">
+
+<polymer-element name="polymer-grid-layout" attributes="nodes layout auto">
+  <template>
+  </template>
+  <script>
+    (function() {
+      Polymer('polymer-grid-layout', {
+        nodes: null,
+        layout: null,
+        auto: false,
+        created: function() {
+          this.layout = [];
+        },
+        nodesChanged: function() {
+          this.invalidate();
+        },
+        layoutChanged: function() {
+          this.invalidate();
+        },
+        autoNodes: function() {
+          this.nodes = this.parentNode.children.array().filter(
+            function(node) {
+              switch(node.localName) {
+                case 'polymer-grid-layout':
+                case 'style':
+                  return false;
+              }
+              return true;
+            }
+          );
+        },
+        invalidate: function() {
+          if (this.layout && this.layout.length) {
+            // job debounces layout, only letting it occur every N ms
+            this.layoutJob = this.job(this.layoutJob, this.relayout);
+          }
+        },
+        relayout: function() {
+          if (!this.nodes || this.auto) {
+            this.autoNodes();
+          }
+          layout(this.layout, this.nodes);
+          this.asyncFire('polymer-grid-layout');
+        }
+      });
+
+      //
+
+      var lineParent;
+
+      function line(axis, p, d) {
+        var l = document.createElement('line');
+        var extent = (axis === 'left' ? 'width' : 
+          (axis === 'top' ? 'height' : axis));
+        l.setAttribute('extent', extent);
+        if (d < 0) {
+          axis = (axis === 'left' ? 'right' : 
+            (axis === 'top' ? 'bottom' : axis));
+        }
+        p = Math.abs(p);
+        l.style[axis] = p + 'px';
+        l.style[extent] = '0px';
+        lineParent.appendChild(l);
+      }
+
+      var colCount, colOwners, rowCount, rowOwners;
+
+      function matrixillate(matrix) {
+        // mesaure the matrix, must be rectangular
+        rowCount = matrix.length;
+        colCount = rowCount && matrix[0].length || 0;
+        // transpose matrix
+        var transpose = [];
+        for (var i=0; i<colCount; i++) {
+          var c = [];
+          for (var j=0; j<rowCount; j++) {
+            c.push(matrix[j][i]);
+          }
+          transpose.push(c);
+        }
+        // assign sizing control
+        colOwners = findOwners(matrix);
+        rowOwners = findOwners(transpose);
+        //console.log('colOwners', colOwners);
+        //console.log('rowOwners', rowOwners);
+      }
+
+      function findOwners(matrix) {
+        var majCount = matrix.length;
+        var minCount = majCount && matrix[0].length || 0;
+        var owners = [];
+        // for each column (e.g.)
+        for (var i=0; i<minCount; i++) {
+          // array of contained areas
+          var contained = {};
+          // look at each row to find a containing area
+          for (var j=0; j<majCount; j++) {
+            // get the row vector
+            var vector = matrix[j]
+            // node index at [i,j]
+            var nodei = vector[i];
+            // if a node is there
+            if (nodei) {
+              // determine if it bounds this column
+              var owns = false;
+              if (i === 0) {
+                owns = (i === minCount-1) || (nodei !== vector[i+1]);
+              } else if (i === minCount - 1) {
+                owns = (i === 0) || (nodei !== vector[i-1]);
+              } else {
+                owns = nodei !== vector[i-1] && nodei !== vector[i+1];
+              }
+              if (owns) {
+                contained[nodei] = 1;
+              }
+            }
+            // store the owners for this column
+            owners[i] = contained;
+          }
+        }
+        return owners;
+      }
+
+      var nodes;
+
+      function colWidth(i) {
+        for (var col in colOwners[i]) {
+          col = Number(col);
+          if (col === 0) {
+            return 96;
+          }
+          var node = nodes[col - 1];
+          if (node.hasAttribute('h-flex') || node.hasAttribute('flex')) {
+            return -1;
+          }
+          var w = node.offsetWidth;
+          //console.log('colWidth(' + i + ') ==', w);
+          return w;
+        }
+        return -1;
+      }
+
+      function rowHeight(i) {
+        for (var row in rowOwners[i]) {
+          row = Number(row);
+          if (row === 0) {
+            return 96;
+          }
+          var node = nodes[row - 1];
+          if (node.hasAttribute('v-flex') || node.hasAttribute('flex')) {
+            return -1;
+          }
+          var h = node.offsetHeight;
+          //console.log('rowHeight(' + i + ') ==', h);
+          return h;
+        }
+        return -1;
+      }
+
+      var m = 0;
+
+      function railize(count, sizeFn) {
+        //
+        // create rails for `count` tracks using 
+        // sizing function `sizeFn(trackNo)`
+        //
+        // for n tracks there are (n+1) rails
+        //
+        //   |track|track|track|
+        //  0|->sz0|->sz1|<-sz2|0
+        //
+        //   |track|track|track|
+        //  0|->sz0|     |<-sz2|0
+        //
+        // there can be one elastic track per set
+        //
+        //   |track|track|track|track|
+        //  0|-->s0|-->s1|<--s1|<--s2|0
+        //
+        // sz1 spans multiple  tracks which makes
+        // it elastic (it's underconstrained)
+        //
+        var rails = [];
+        var a = 0;
+        for (var i=0, x; i<count; i++) {
+          rails[i] = {p: a, s: 1};
+          x = sizeFn(i) + m + m;
+          if (x == -1) {
+            break;
+          }
+          a += x;
+        }
+        if (i === count) {
+          rails[i] = {p: 0, s: -1};
+        }
+        var b = 0;
+        for (var ii=count, x; ii>i; ii--) {
+          rails[ii] = {p: b, s: -1};
+          x = sizeFn(ii - 1) + m + m;
+          if (x !== -1) {
+            b += x;
+          }
+        }
+        return rails;
+      }
+
+      // TODO(sjmiles): this code tries to preserve actual position,
+      // so 'unposition' is really 'naturalize' or something
+      function unposition(box) {
+        var style = box.style;
+        //style.right = style.bottom = style.width = style.height = '';
+        style.position = 'absolute';
+        style.display = 'inline-block';
+        style.boxSizing = style.mozBoxSizing = 'border-box';
+      }
+
+      function _position(style, maj, min, ext, a, b) {
+        style[maj] = style[min] = '';
+        style[ext] = 'auto';
+        if (a.s < 0 && b.s < 0) {
+          var siz = a.p - b.p - m - m;
+          style[ext] = siz + 'px';
+          var c = 'calc(100% - ' + (b.p + siz + m) + 'px' + ')';
+          style[maj] = '-webkit-' + c;
+          style[maj] = c;
+        } else if (b.s < 0) {
+          style[maj] = a.p + m + 'px';
+          style[min] = b.p + m + 'px';
+        } else {
+          style[maj] = a.p + m + 'px';
+          style[ext] = b.p - a.p - m - m + 'px';
+        }
+      }
+
+      function position(elt, left, right, top, bottom) {
+        _position(elt.style, 'top', 'bottom', 'height', rows[top], 
+            rows[bottom]);
+        _position(elt.style, 'left', 'right', 'width', columns[left], 
+            columns[right]);
+      }
+
+      function layout(matrix, anodes, alineParent) {
+        //console.group('layout');
+
+        lineParent = alineParent;
+        nodes = anodes;
+        matrixillate(matrix);
+
+        nodes.forEach(unposition);
+
+        columns = railize(colCount, colWidth);
+        rows = railize(rowCount, rowHeight);
+
+        if (alineParent) {
+          //console.group('column rails');
+          columns.forEach(function(c) {
+            //console.log(c.p, c.s);
+            line('left', c.p, c.s);
+          });
+          //console.groupEnd();
+
+          //console.group('row rails');
+          rows.forEach(function(r) {
+            //console.log(r.p, r.s);
+            line('top', r.p, r.s);
+          });
+          //console.groupEnd();
+        }
+
+        //console.group('rail boundaries');
+        nodes.forEach(function(node, i) {
+          // node indices are 1-based
+          var n = i + 1;
+          // boundary rails
+          var l, r, t = 1e10, b = -1e10;
+          matrix.forEach(function(vector, i) {
+            var f = vector.indexOf(n);
+            if (f > -1) {
+              l = f;
+              r = vector.lastIndexOf(n) + 1;
+              t = Math.min(t, i);
+              b = Math.max(b, i) + 1;
+            }
+          });
+          if (l == undefined) {
+            //console.log('unused');
+            node.style.position = 'absolute';
+            var offscreen = node.getAttribute('offscreen');
+            switch (offscreen) {
+              case 'basement':
+                node.style.zIndex = 0;
+                break;
+              case 'left':
+              case 'top':
+                node.style[offscreen] = node.offsetWidth * -2 + 'px';
+                break;
+              case 'right':
+                node.style.left = node.offsetParent.offsetWidth 
+                    + node.offsetWidth + 'px';
+                break;
+              case 'bottom':
+                node.style.top = node.parentNode.offsetHeight 
+                    + node.offsetHeight + 'px';
+                break;
+              default:
+                node.style[Math.random() >= 0.5 ? 'left' : 'top'] = '-110%';
+            }
+            //node.style.opacity = 0;
+            node.style.pointerEvents = 'none';
+          } else {
+            node.style.pointerEvents = '';
+            //node.style.opacity = '';
+            //console.log(l, r, t, b);
+            position(node, l, r, t, b);
+          }
+        });
+        //console.groupEnd();
+        //console.groupEnd();
+      }
+
+    })();
+  </script>
+</polymer-element>