michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: function init() {
michael@0:     enableAsyncScrolling();
michael@0:     messageManager.loadFrameScript(
michael@0:         "chrome://global/content/test-ipcbrowser-content.js", true
michael@0:     );
michael@0: }
michael@0: 
michael@0: function browser() {
michael@0:     return document.getElementById("content");
michael@0: }
michael@0: 
michael@0: function frameLoader() {
michael@0:     return browser().QueryInterface(Components.interfaces.nsIFrameLoaderOwner).frameLoader;
michael@0: }
michael@0: 
michael@0: function viewManager() {
michael@0:     return frameLoader().QueryInterface(Components.interfaces.nsIContentViewManager);
michael@0: }
michael@0: 
michael@0: function rootView() {
michael@0:     return viewManager().rootContentView;
michael@0: }
michael@0: 
michael@0: function enableAsyncScrolling() {
michael@0:     frameLoader().renderMode = Components.interfaces.nsIFrameLoader.RENDER_MODE_ASYNC_SCROLL;
michael@0: }
michael@0: 
michael@0: // Functions affecting the content window.
michael@0: 
michael@0: function loadURL(url) {
michael@0:     browser().setAttribute('src', url);
michael@0: }
michael@0: 
michael@0: function scrollContentBy(dx, dy) {
michael@0:     messageManager.broadcastAsyncMessage("scrollBy",
michael@0:                                          { dx: dx, dy: dy });
michael@0: 
michael@0: }
michael@0: 
michael@0: function scrollContentTo(x, y) {
michael@0:     messageManager.broadcastAsyncMessage("scrollTo",
michael@0:                                          { x: x, y: y });
michael@0: }
michael@0: 
michael@0: function setContentViewport(w, h) {
michael@0:     messageManager.broadcastAsyncMessage("setViewport",
michael@0:                                          { w: w, h: h });
michael@0: }
michael@0: 
michael@0: function setContentDisplayPort(x, y, w, h) {
michael@0:     messageManager.broadcastAsyncMessage("setDisplayPort",
michael@0:                                          { x: x, y: y, w: w, h: h });
michael@0: }
michael@0: 
michael@0: function setContentResolution(xres, yres) {
michael@0:     messageManager.broadcastAsyncMessage("setResolution",
michael@0:                                          { xres: xres, yres: yres });
michael@0: }
michael@0: 
michael@0: // Functions affecting <browser>.
michael@0: 
michael@0: function scrollViewportBy(dx, dy) {
michael@0:     rootView().scrollBy(dx, dy);
michael@0: }
michael@0: 
michael@0: function scrollViewportTo(x, y) {
michael@0:     rootView().scrollTo(x, y);
michael@0: }
michael@0: 
michael@0: function setViewportScale(xs, ys) {
michael@0:     rootView().setScale(xs, ys);
michael@0: }
michael@0: 
michael@0: var kDelayMs = 100;
michael@0: var kDurationMs = 250;
michael@0: var scrolling = false;
michael@0: function startAnimatedScrollBy(dx, dy) {
michael@0:     if (scrolling)
michael@0:         throw "don't interrupt me!";
michael@0: 
michael@0:     scrolling = true;
michael@0: 
michael@0:     var start = mozAnimationStartTime;
michael@0:     var end = start + kDurationMs;
michael@0:     // |- k| so that we do something in first invocation of nudge()
michael@0:     var prevNow = start - 20;
michael@0:     var accumDx = 0, accumDy = 0;
michael@0: 
michael@0:     var sentScrollBy = false;
michael@0:     function nudgeScroll(now) {
michael@0: 	if (!scrolling) {
michael@0: 	    // we've been canceled
michael@0: 	    return;
michael@0: 	}
michael@0:         var ddx = dx * (now - prevNow) / kDurationMs;
michael@0:         var ddy = dy * (now - prevNow) / kDurationMs;
michael@0: 
michael@0:         ddx = Math.min(dx - accumDx, ddx);
michael@0:         ddy = Math.min(dy - accumDy, ddy);
michael@0:         accumDx += ddx;
michael@0:         accumDy += ddy;
michael@0: 
michael@0:         rootView().scrollBy(ddx, ddy);
michael@0: 
michael@0:         if (!sentScrollBy && 100 <= (now - start)) {
michael@0:             messageManager.broadcastAsyncMessage("scrollBy",
michael@0:                                                  { dx: dx, dy: dy });
michael@0:             sentScrollBy = true;
michael@0:         }
michael@0: 
michael@0:         if (now >= end || (accumDx >= dx && accumDy >= dy)) {
michael@0:             var fixupDx = Math.max(dx - accumDx, 0);
michael@0:             var fixupDy = Math.max(dy - accumDy, 0);
michael@0:             rootView().scrollBy(fixupDx, fixupDy);
michael@0: 
michael@0:             scrolling = false;
michael@0:         }
michael@0:         else {
michael@0:             mozRequestAnimationFrame(nudgeScroll);
michael@0:         }
michael@0: 
michael@0:         prevNow = now;
michael@0:     }
michael@0: 
michael@0:     nudgeScroll(start);
michael@0:     mozRequestAnimationFrame(nudgeScroll);
michael@0: }