relation.js
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/* --------------------------- relation (connector) ----------- */
SQL.Relation = function(owner, row1, row2) {
this.owner = owner;
this.row1 = row1;
this.row2 = row2;
this.color = "#000";
this.hidden = false;
SQL.Visual.apply(this);
/* if one of the rows already has relations, inherit color */
var all = row1.relations.concat(row2.relations);
if (all.length) { /* inherit */
this.color = all[0].getColor();
} else if (CONFIG.RELATION_COLORS) { /* pick next */
SQL.Relation._counter++;
var colorIndex = SQL.Relation._counter - 1;
this.color = CONFIG.RELATION_COLORS[colorIndex % CONFIG.RELATION_COLORS.length];
}
this.row1.addRelation(this);
this.row2.addRelation(this);
this.dom = [];
if (this.owner.vector) {
var path = document.createElementNS(this.owner.svgNS, "path");
path.setAttribute("stroke", this.color);
path.setAttribute("stroke-width", CONFIG.RELATION_THICKNESS);
path.setAttribute("fill", "none");
this.owner.dom.svg.appendChild(path);
this.dom.push(path);
} else {
for (var i=0;i<3;i++) {
var div = OZ.DOM.elm("div",{position:"absolute",className:"relation",backgroundColor:this.color});
this.dom.push(div);
if (i & 1) { /* middle */
OZ.Style.set(div, {width:CONFIG.RELATION_THICKNESS+"px"});
} else { /* first & last */
OZ.Style.set(div, {height:CONFIG.RELATION_THICKNESS+"px"});
}
this.owner.dom.container.appendChild(div);
}
}
this.redraw();
}
SQL.Relation._counter = 0;
SQL.Relation.prototype = Object.create(SQL.Visual.prototype);
SQL.Relation.prototype.getColor = function() {
return this.color;
}
SQL.Relation.prototype.show = function() {
this.hidden = false;
for (var i=0;i<this.dom.length;i++) {
this.dom[i].style.visibility = "";
}
}
SQL.Relation.prototype.hide = function() {
this.hidden = true;
for (var i=0;i<this.dom.length;i++) {
this.dom[i].style.visibility = "hidden";
}
}
SQL.Relation.prototype.redrawNormal = function(p1, p2, half) {
if (this.owner.vector) {
var str = "M "+p1[0]+" "+p1[1]+" C "+(p1[0] + half)+" "+p1[1]+" ";
str += (p2[0]-half)+" "+p2[1]+" "+p2[0]+" "+p2[1];
this.dom[0].setAttribute("d",str);
} else {
this.dom[0].style.left = p1[0]+"px";
this.dom[0].style.top = p1[1]+"px";
this.dom[0].style.width = half+"px";
this.dom[1].style.left = (p1[0] + half) + "px";
this.dom[1].style.top = Math.min(p1[1],p2[1]) + "px";
this.dom[1].style.height = (Math.abs(p1[1] - p2[1])+CONFIG.RELATION_THICKNESS)+"px";
this.dom[2].style.left = (p1[0]+half+1)+"px";
this.dom[2].style.top = p2[1]+"px";
this.dom[2].style.width = half+"px";
}
}
SQL.Relation.prototype.redrawSide = function(p1, p2, x) {
if (this.owner.vector) {
var str = "M "+p1[0]+" "+p1[1]+" C "+x+" "+p1[1]+" ";
str += x+" "+p2[1]+" "+p2[0]+" "+p2[1];
this.dom[0].setAttribute("d",str);
} else {
this.dom[0].style.left = Math.min(x,p1[0])+"px";
this.dom[0].style.top = p1[1]+"px";
this.dom[0].style.width = Math.abs(p1[0]-x)+"px";
this.dom[1].style.left = x+"px";
this.dom[1].style.top = Math.min(p1[1],p2[1]) + "px";
this.dom[1].style.height = (Math.abs(p1[1] - p2[1])+CONFIG.RELATION_THICKNESS)+"px";
this.dom[2].style.left = Math.min(x,p2[0])+"px";
this.dom[2].style.top = p2[1]+"px";
this.dom[2].style.width = Math.abs(p2[0]-x)+"px";
}
}
SQL.Relation.prototype.redraw = function() { /* draw connector */
if (this.hidden) { return; }
var t1 = this.row1.owner.dom.container;
var t2 = this.row2.owner.dom.container;
var l1 = t1.offsetLeft;
var l2 = t2.offsetLeft;
var r1 = l1 + t1.offsetWidth;
var r2 = l2 + t2.offsetWidth;
var t1 = t1.offsetTop + this.row1.dom.container.offsetTop + Math.round(this.row1.dom.container.offsetHeight/2);
var t2 = t2.offsetTop + this.row2.dom.container.offsetTop + Math.round(this.row2.dom.container.offsetHeight/2);
if (this.row1.owner.selected) { t1++; l1++; r1--; }
if (this.row2.owner.selected) { t2++; l2++; r2--; }
var p1 = [0,0];
var p2 = [0,0];
if (r1 < l2 || r2 < l1) { /* between tables */
if (Math.abs(r1 - l2) < Math.abs(r2 - l1)) {
p1 = [r1,t1];
p2 = [l2,t2];
} else {
p1 = [r2,t2];
p2 = [l1,t1];
}
var half = Math.floor((p2[0] - p1[0])/2);
this.redrawNormal(p1, p2, half);
} else { /* next to tables */
var x = 0;
var l = 0;
if (Math.abs(l1 - l2) < Math.abs(r1 - r2)) { /* left of tables */
p1 = [l1,t1];
p2 = [l2,t2];
x = Math.min(l1,l2) - CONFIG.RELATION_SPACING;
} else { /* right of tables */
p1 = [r1,t1];
p2 = [r2,t2];
x = Math.max(r1,r2) + CONFIG.RELATION_SPACING;
}
this.redrawSide(p1, p2, x);
} /* line next to tables */
}
SQL.Relation.prototype.destroy = function() {
this.row1.removeRelation(this);
this.row2.removeRelation(this);
for (var i=0;i<this.dom.length;i++) {
this.dom[i].parentNode.removeChild(this.dom[i]);
}
}