michael@0: // The including script sets this for us
michael@0: //var NUM_STEPS;
michael@0: 
michael@0: var plugin;
michael@0: var left = 1, top = 1, width = 199, height = 199;
michael@0: function movePluginTo(x, y, w, h) {
michael@0:     left = x; top = y;  width = w; height = h;
michael@0:     plugin.width = w;
michael@0:     plugin.height = h;
michael@0:     plugin.style.left = left + "px";
michael@0:     plugin.style.top = top + "px";
michael@0: }
michael@0: function deltaInBounds(dx,dy, dw,dh) {
michael@0:     var l = dx + left;
michael@0:     var r = l + width + dw;
michael@0:     var t = dy + top;
michael@0:     var b = t + height + dh;
michael@0:     return (0 <= l && l <= 20 &&
michael@0:             0 <= t && t <= 20 &&
michael@0:             200 <= r && r <= 220 &&
michael@0:             200 <= b && b <= 220);
michael@0: }
michael@0: 
michael@0: var initialFrame;
michael@0: function start() {
michael@0:     window.removeEventListener("MozReftestInvalidate", start, false);
michael@0: 
michael@0:     window.addEventListener("MozAfterPaint", step, false);
michael@0:     window.addEventListener("MozPaintWaitFinished", step, false);
michael@0: 
michael@0:     initialFrame = window.mozPaintCount;
michael@0:     plugin = document.getElementById("plugin");
michael@0: 
michael@0:     movePluginTo(0,0, 200,200);
michael@0: }
michael@0: 
michael@0: var steps = 0;
michael@0: var which = "move"; // or "grow"
michael@0: var dx = 1, dy = 1, dw = 1, dh = 1;
michael@0: function step() {
michael@0:     if (++steps >= NUM_STEPS) {
michael@0:         window.removeEventListener("MozAfterPaint", step, false);
michael@0:         window.removeEventListener("MozPaintWaitFinished", step, false);
michael@0:         return finish();
michael@0:     }
michael@0: 
michael@0:     var didSomething = false;
michael@0:     if (which == "grow") {
michael@0:         if (deltaInBounds(0,0, dw,dh)) {
michael@0:             movePluginTo(left,top, width+dw, height+dh);
michael@0:             didSomething = true;
michael@0:         } else {
michael@0:             dw = -dw;  dh = -dh;
michael@0:         }
michael@0:     } else {
michael@0:         // "move"
michael@0:         if (deltaInBounds(dx,dy, 0,0)) {
michael@0:             movePluginTo(left+dx,top+dy, width, height);
michael@0:             didSomething = true;
michael@0:         } else {
michael@0:             dx = -dx;  dy = -dy;
michael@0:         }
michael@0:     }
michael@0:     which = (which == "grow") ? "move" : "grow";
michael@0: 
michael@0:     if (!didSomething) {
michael@0:         step();
michael@0:     }
michael@0: }
michael@0: 
michael@0: function finish() {
michael@0:     document.documentElement.removeAttribute("class");
michael@0: }
michael@0: 
michael@0: window.addEventListener("MozReftestInvalidate", start, false);