gecko-dev/toolkit/content/browser-content.js

559 lines
18 KiB
JavaScript

/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
let Cc = Components.classes;
let Ci = Components.interfaces;
let Cu = Components.utils;
let Cr = Components.results;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
var global = this;
let ClickEventHandler = {
init: function init() {
this._scrollable = null;
this._scrolldir = "";
this._startX = null;
this._startY = null;
this._screenX = null;
this._screenY = null;
this._lastFrame = null;
Cc["@mozilla.org/eventlistenerservice;1"]
.getService(Ci.nsIEventListenerService)
.addSystemEventListener(global, "mousedown", this, true);
addMessageListener("Autoscroll:Stop", this);
},
isAutoscrollBlocker: function(node) {
let mmPaste = Services.prefs.getBoolPref("middlemouse.paste");
let mmScrollbarPosition = Services.prefs.getBoolPref("middlemouse.scrollbarPosition");
while (node) {
if ((node instanceof content.HTMLAnchorElement || node instanceof content.HTMLAreaElement) &&
node.hasAttribute("href")) {
return true;
}
if (mmPaste && (node instanceof content.HTMLInputElement ||
node instanceof content.HTMLTextAreaElement)) {
return true;
}
if (node instanceof content.XULElement && mmScrollbarPosition
&& (node.localName == "scrollbar" || node.localName == "scrollcorner")) {
return true;
}
node = node.parentNode;
}
return false;
},
findNearestScrollableElement: function(aNode) {
// this is a list of overflow property values that allow scrolling
const scrollingAllowed = ['scroll', 'auto'];
// go upward in the DOM and find any parent element that has a overflow
// area and can therefore be scrolled
for (this._scrollable = aNode; this._scrollable;
this._scrollable = this._scrollable.parentNode) {
// do not use overflow based autoscroll for <html> and <body>
// Elements or non-html elements such as svg or Document nodes
// also make sure to skip select elements that are not multiline
if (!(this._scrollable instanceof content.HTMLElement) ||
((this._scrollable instanceof content.HTMLSelectElement) && !this._scrollable.multiple)) {
continue;
}
var overflowx = this._scrollable.ownerDocument.defaultView
.getComputedStyle(this._scrollable, '')
.getPropertyValue('overflow-x');
var overflowy = this._scrollable.ownerDocument.defaultView
.getComputedStyle(this._scrollable, '')
.getPropertyValue('overflow-y');
// we already discarded non-multiline selects so allow vertical
// scroll for multiline ones directly without checking for a
// overflow property
var scrollVert = this._scrollable.scrollTopMax &&
(this._scrollable instanceof content.HTMLSelectElement ||
scrollingAllowed.indexOf(overflowy) >= 0);
// do not allow horizontal scrolling for select elements, it leads
// to visual artifacts and is not the expected behavior anyway
if (!(this._scrollable instanceof content.HTMLSelectElement) &&
this._scrollable.scrollLeftMax &&
scrollingAllowed.indexOf(overflowx) >= 0) {
this._scrolldir = scrollVert ? "NSEW" : "EW";
break;
} else if (scrollVert) {
this._scrolldir = "NS";
break;
}
}
if (!this._scrollable) {
this._scrollable = aNode.ownerDocument.defaultView;
if (this._scrollable.scrollMaxX > 0) {
this._scrolldir = this._scrollable.scrollMaxY > 0 ? "NSEW" : "EW";
} else if (this._scrollable.scrollMaxY > 0) {
this._scrolldir = "NS";
} else if (this._scrollable.frameElement) {
this.findNearestScrollableElement(this._scrollable.frameElement);
} else {
this._scrollable = null; // abort scrolling
}
}
},
startScroll: function(event) {
this.findNearestScrollableElement(event.originalTarget);
if (!this._scrollable)
return;
let [enabled] = sendSyncMessage("Autoscroll:Start",
{scrolldir: this._scrolldir,
screenX: event.screenX,
screenY: event.screenY});
if (!enabled) {
this._scrollable = null;
return;
}
Cc["@mozilla.org/eventlistenerservice;1"]
.getService(Ci.nsIEventListenerService)
.addSystemEventListener(global, "mousemove", this, true);
addEventListener("pagehide", this, true);
this._ignoreMouseEvents = true;
this._startX = event.screenX;
this._startY = event.screenY;
this._screenX = event.screenX;
this._screenY = event.screenY;
this._scrollErrorX = 0;
this._scrollErrorY = 0;
this._lastFrame = content.mozAnimationStartTime;
content.mozRequestAnimationFrame(this);
},
stopScroll: function() {
if (this._scrollable) {
this._scrollable.mozScrollSnap();
this._scrollable = null;
Cc["@mozilla.org/eventlistenerservice;1"]
.getService(Ci.nsIEventListenerService)
.removeSystemEventListener(global, "mousemove", this, true);
removeEventListener("pagehide", this, true);
}
},
accelerate: function(curr, start) {
const speed = 12;
var val = (curr - start) / speed;
if (val > 1)
return val * Math.sqrt(val) - 1;
if (val < -1)
return val * Math.sqrt(-val) + 1;
return 0;
},
roundToZero: function(num) {
if (num > 0)
return Math.floor(num);
return Math.ceil(num);
},
autoscrollLoop: function(timestamp) {
if (!this._scrollable) {
// Scrolling has been canceled
return;
}
// avoid long jumps when the browser hangs for more than
// |maxTimeDelta| ms
const maxTimeDelta = 100;
var timeDelta = Math.min(maxTimeDelta, timestamp - this._lastFrame);
// we used to scroll |accelerate()| pixels every 20ms (50fps)
var timeCompensation = timeDelta / 20;
this._lastFrame = timestamp;
var actualScrollX = 0;
var actualScrollY = 0;
// don't bother scrolling vertically when the scrolldir is only horizontal
// and the other way around
if (this._scrolldir != 'EW') {
var y = this.accelerate(this._screenY, this._startY) * timeCompensation;
var desiredScrollY = this._scrollErrorY + y;
actualScrollY = this.roundToZero(desiredScrollY);
this._scrollErrorY = (desiredScrollY - actualScrollY);
}
if (this._scrolldir != 'NS') {
var x = this.accelerate(this._screenX, this._startX) * timeCompensation;
var desiredScrollX = this._scrollErrorX + x;
actualScrollX = this.roundToZero(desiredScrollX);
this._scrollErrorX = (desiredScrollX - actualScrollX);
}
if (this._scrollable instanceof content.Window) {
this._scrollable.scrollBy(actualScrollX, actualScrollY);
} else { // an element with overflow
this._scrollable.scrollLeft += actualScrollX;
this._scrollable.scrollTop += actualScrollY;
}
content.mozRequestAnimationFrame(this);
},
sample: function(timestamp) {
this.autoscrollLoop(timestamp);
},
handleEvent: function(event) {
if (event.type == "mousemove") {
this._screenX = event.screenX;
this._screenY = event.screenY;
} else if (event.type == "mousedown") {
if (event.isTrusted &
!event.defaultPrevented &&
event.button == 1 &&
!this._scrollable &&
!this.isAutoscrollBlocker(event.originalTarget)) {
this.startScroll(event);
}
} else if (event.type == "pagehide") {
if (this._scrollable) {
var doc =
this._scrollable.ownerDocument || this._scrollable.document;
if (doc == event.target) {
sendAsyncMessage("Autoscroll:Cancel");
}
}
}
},
receiveMessage: function(msg) {
switch (msg.name) {
case "Autoscroll:Stop": {
this.stopScroll();
break;
}
}
},
};
ClickEventHandler.init();
let PopupBlocking = {
popupData: null,
popupDataInternal: null,
init: function() {
addEventListener("DOMPopupBlocked", this, true);
addEventListener("pageshow", this, true);
addEventListener("pagehide", this, true);
addMessageListener("PopupBlocking:UnblockPopup", this);
},
receiveMessage: function(msg) {
switch (msg.name) {
case "PopupBlocking:UnblockPopup": {
let i = msg.data.index;
if (this.popupData && this.popupData[i]) {
let data = this.popupData[i];
let internals = this.popupDataInternal[i];
let dwi = internals.requestingWindow;
// If we have a requesting window and the requesting document is
// still the current document, open the popup.
if (dwi && dwi.document == internals.requestingDocument) {
dwi.open(data.popupWindowURI, data.popupWindowName, data.popupWindowFeatures);
}
}
break;
}
}
},
handleEvent: function(ev) {
switch (ev.type) {
case "DOMPopupBlocked":
return this.onPopupBlocked(ev);
case "pageshow":
return this.onPageShow(ev);
case "pagehide":
return this.onPageHide(ev);
}
},
onPopupBlocked: function(ev) {
if (!this.popupData) {
this.popupData = new Array();
this.popupDataInternal = new Array();
}
let obj = {
popupWindowURI: ev.popupWindowURI.spec,
popupWindowFeatures: ev.popupWindowFeatures,
popupWindowName: ev.popupWindowName
};
let internals = {
requestingWindow: ev.requestingWindow,
requestingDocument: ev.requestingWindow.document,
};
this.popupData.push(obj);
this.popupDataInternal.push(internals);
this.updateBlockedPopups(true);
},
onPageShow: function(ev) {
if (this.popupData) {
let i = 0;
while (i < this.popupData.length) {
// Filter out irrelevant reports.
if (this.popupDataInternal[i].requestingWindow &&
(this.popupDataInternal[i].requestingWindow.document ==
this.popupDataInternal[i].requestingDocument)) {
i++;
} else {
this.popupData.splice(i, 1);
this.popupDataInternal.splice(i, 1);
}
}
if (this.popupData.length == 0) {
this.popupData = null;
this.popupDataInternal = null;
}
this.updateBlockedPopups(false);
}
},
onPageHide: function(ev) {
if (this.popupData) {
this.popupData = null;
this.popupDataInternal = null;
this.updateBlockedPopups(false);
}
},
updateBlockedPopups: function(freshPopup) {
sendAsyncMessage("PopupBlocking:UpdateBlockedPopups",
{blockedPopups: this.popupData, freshPopup: freshPopup});
},
};
PopupBlocking.init();
// Set up console.* for frame scripts.
let Console = Components.utils.import("resource://gre/modules/devtools/Console.jsm", {});
this.console = new Console.ConsoleAPI();
let Printing = {
// Bug 1088061: nsPrintEngine's DoCommonPrint currently expects the
// progress listener passed to it to QI to an nsIPrintingPromptService
// in order to know that a printing progress dialog has been shown. That's
// really all the interface is used for, hence the fact that I don't actually
// implement the interface here. Bug 1088061 has been filed to remove
// this hackery.
QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener,
Ci.nsIPrintingPromptService]),
MESSAGES: [
"Printing:Preview:Enter",
"Printing:Preview:Exit",
"Printing:Preview:Navigate",
"Printing:Preview:UpdatePageCount",
"Printing:Print",
],
init() {
this.MESSAGES.forEach(msgName => addMessageListener(msgName, this));
},
get shouldSavePrintSettings() {
return Services.prefs.getBoolPref("print.use_global_printsettings", false) &&
Services.prefs.getBoolPref("print.save_print_settings", false);
},
receiveMessage(message) {
let objects = message.objects;
let data = message.data;
switch(message.name) {
case "Printing:Preview:Enter": {
this.enterPrintPreview(objects.contentWindow);
break;
}
case "Printing:Preview:Exit": {
this.exitPrintPreview();
break;
}
case "Printing:Preview:Navigate": {
this.navigate(data.navType, data.pageNum);
break;
}
case "Printing:Preview:UpdatePageCount": {
this.updatePageCount();
break;
}
case "Printing:Print": {
this.print(objects.contentWindow);
break;
}
}
},
getPrintSettings() {
try {
let PSSVC = Cc["@mozilla.org/gfx/printsettings-service;1"]
.getService(Ci.nsIPrintSettingsService);
let printSettings = PSSVC.globalPrintSettings;
if (!printSettings.printerName) {
printSettings.printerName = PSSVC.defaultPrinterName;
}
// First get any defaults from the printer
PSSVC.initPrintSettingsFromPrinter(printSettings.printerName,
printSettings);
// now augment them with any values from last time
PSSVC.initPrintSettingsFromPrefs(printSettings, true,
printSettings.kInitSaveAll);
return printSettings;
} catch(e) {
Components.utils.reportError(e);
}
return null;
},
enterPrintPreview(contentWindow) {
// We'll call this whenever we've finished reflowing the document, or if
// we errored out while attempting to print preview (in which case, we'll
// notify the parent that we've failed).
let notifyEntered = (error) => {
removeEventListener("printPreviewUpdate", onPrintPreviewReady);
sendAsyncMessage("Printing:Preview:Entered", {
failed: !!error,
});
};
let onPrintPreviewReady = () => {
notifyEntered();
};
// We have to wait for the print engine to finish reflowing all of the
// documents and subdocuments before we can tell the parent to flip to
// the print preview UI - otherwise, the print preview UI might ask for
// information (like the number of pages in the document) before we have
// our PresShells set up.
addEventListener("printPreviewUpdate", onPrintPreviewReady);
try {
let printSettings = this.getPrintSettings();
docShell.printPreview.printPreview(printSettings, contentWindow, this);
} catch(error) {
// This might fail if we, for example, attempt to print a XUL document.
// In that case, we inform the parent to bail out of print preview.
Components.utils.reportError(error);
notifyEntered(error);
}
},
exitPrintPreview() {
docShell.printPreview.exitPrintPreview();
},
print(contentWindow) {
let printSettings = this.getPrintSettings();
let rv = Cr.NS_OK;
try {
let print = contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIWebBrowserPrint);
print.print(printSettings, null);
} catch(e) {
// Pressing cancel is expressed as an NS_ERROR_ABORT return value,
// causing an exception to be thrown which we catch here.
if (e.result != Cr.NS_ERROR_ABORT) {
Cu.reportError(`In Printing:Print:Done handler, got unexpected rv
${e.result}.`);
}
}
if (this.shouldSavePrintSettings) {
let PSSVC = Cc["@mozilla.org/gfx/printsettings-service;1"]
.getService(Ci.nsIPrintSettingsService);
PSSVC.savePrintSettingsToPrefs(printSettings, true,
printSettings.kInitSaveAll);
PSSVC.savePrintSettingsToPrefs(printSettings, false,
printSettings.kInitSavePrinterName);
}
},
updatePageCount() {
let numPages = docShell.printPreview.printPreviewNumPages;
sendAsyncMessage("Printing:Preview:UpdatePageCount", {
numPages: numPages,
});
},
navigate(navType, pageNum) {
docShell.printPreview.printPreviewNavigate(navType, pageNum);
},
/* nsIWebProgressListener for print preview */
onStateChange(aWebProgress, aRequest, aStateFlags, aStatus) {
sendAsyncMessage("Printing:Preview:StateChange", {
stateFlags: aStateFlags,
status: aStatus,
});
},
onProgressChange(aWebProgress, aRequest, aCurSelfProgress,
aMaxSelfProgress, aCurTotalProgress,
aMaxTotalProgress) {
sendAsyncMessage("Printing:Preview:ProgressChange", {
curSelfProgress: aCurSelfProgress,
maxSelfProgress: aMaxSelfProgress,
curTotalProgress: aCurTotalProgress,
maxTotalProgress: aMaxTotalProgress,
});
},
onLocationChange(aWebProgress, aRequest, aLocation, aFlags) {},
onStatusChange(aWebProgress, aRequest, aStatus, aMessage) {},
onSecurityChange(aWebProgress, aRequest, aState) {},
}
Printing.init();
function SwitchDocumentDirection(aWindow) {
// document.dir can also be "auto", in which case it won't change
if (aWindow.document.dir == "ltr" || aWindow.document.dir == "") {
aWindow.document.dir = "rtl";
} else if (aWindow.document.dir == "rtl") {
aWindow.document.dir = "ltr";
}
for (let run = 0; run < aWindow.frames.length; run++) {
SwitchDocumentDirection(aWindow.frames[run]);
}
}
addMessageListener("SwitchDocumentDirection", () => {
SwitchDocumentDirection(content.window);
});