tenfourfox/toolkit/components/printing/content/printUtils.js
Cameron Kaiser c9b2922b70 hello FPR
2017-04-19 00:56:45 -07:00

623 lines
23 KiB
JavaScript

// -*- tab-width: 2; 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/. */
/**
* PrintUtils is a utility for front-end code to trigger common print
* operations (printing, show print preview, show page settings).
*
* Unfortunately, likely due to inconsistencies in how different operating
* systems do printing natively, our XPCOM-level printing interfaces
* are a bit confusing and the method by which we do something basic
* like printing a page is quite circuitous.
*
* To compound that, we need to support remote browsers, and that means
* kicking off the print jobs in the content process. This means we send
* messages back and forth to that process. browser-content.js contains
* the object that listens and responds to the messages that PrintUtils
* sends.
*
* This also means that <xul:browser>'s that hope to use PrintUtils must have
* their type attribute set to either "content", "content-targetable", or
* "content-primary".
*
* PrintUtils sends messages at different points in its implementation, but
* their documentation is consolidated here for ease-of-access.
*
*
* Messages sent:
*
* Printing:Print
* Kick off a print job for a nsIDOMWindow, passing the outer window ID as
* windowID.
*
* Printing:Preview:Enter
* This message is sent to put content into print preview mode. We pass
* the content window of the browser we're showing the preview of, and
* the target of the message is the browser that we'll be showing the
* preview in.
*
* Printing:Preview:Exit
* This message is sent to take content out of print preview mode.
*
*
* Messages Received
*
* Printing:Preview:Entered
* This message is sent by the content process once it has completed
* putting the content into print preview mode. We must wait for that to
* to complete before switching the chrome UI to print preview mode,
* otherwise we have layout issues.
*
* Printing:Preview:StateChange, Printing:Preview:ProgressChange
* Due to a timing issue resulting in a main-process crash, we have to
* manually open the progress dialog for print preview. The progress
* dialog is opened here in PrintUtils, and then we listen for update
* messages from the child. Bug 1088061 has been filed to investigate
* other solutions.
*
*/
var gPrintSettingsAreGlobal = false;
var gSavePrintSettings = false;
var gFocusedElement = null;
var PrintUtils = {
init() {
window.messageManager.addMessageListener("Printing:Error", this);
},
get bundle() {
let stringService = Components.classes["@mozilla.org/intl/stringbundle;1"]
.getService(Components.interfaces.nsIStringBundleService);
delete this.bundle;
return this.bundle = stringService.createBundle("chrome://global/locale/printing.properties");
},
/**
* Shows the page setup dialog, and saves any settings changed in
* that dialog if print.save_print_settings is set to true.
*
* @return true on success, false on failure
*/
showPageSetup: function () {
try {
var printSettings = this.getPrintSettings();
var PRINTPROMPTSVC = Components.classes["@mozilla.org/embedcomp/printingprompt-service;1"]
.getService(Components.interfaces.nsIPrintingPromptService);
PRINTPROMPTSVC.showPageSetup(window, printSettings, null);
if (gSavePrintSettings) {
// Page Setup data is a "native" setting on the Mac
var PSSVC = Components.classes["@mozilla.org/gfx/printsettings-service;1"]
.getService(Components.interfaces.nsIPrintSettingsService);
PSSVC.savePrintSettingsToPrefs(printSettings, true, printSettings.kInitSaveNativeData);
}
} catch (e) {
dump("showPageSetup "+e+"\n");
return false;
}
return true;
},
/**
* Starts the process of printing the contents of a window.
*
* @param aWindowID
* The outer window ID of the nsIDOMWindow to print.
* @param aBrowser
* The <xul:browser> that the nsIDOMWindow for aWindowID belongs to.
*/
printWindow: function (aWindowID, aBrowser)
{
let mm = aBrowser.messageManager;
mm.sendAsyncMessage("Printing:Print", {
windowID: aWindowID,
});
},
/**
* Deprecated.
*
* Starts the process of printing the contents of window.content.
*
*/
print: function ()
{
if (gBrowser) {
return this.printWindow(gBrowser.selectedBrowser.outerWindowID,
gBrowser.selectedBrowser);
}
if (this.usingRemoteTabs) {
throw new Error("PrintUtils.print cannot be run in windows running with " +
"remote tabs. Use PrintUtils.printWindow instead.");
}
let domWindow = window.content;
let ifReq = domWindow.QueryInterface(Components.interfaces.nsIInterfaceRequestor);
let browser = ifReq.getInterface(Components.interfaces.nsIWebNavigation)
.QueryInterface(Components.interfaces.nsIDocShell)
.chromeEventHandler;
if (!browser) {
throw new Error("PrintUtils.print could not resolve content window " +
"to a browser.");
}
let windowID = ifReq.getInterface(Components.interfaces.nsIDOMWindowUtils)
.outerWindowID;
let Deprecated = Components.utils.import("resource://gre/modules/Deprecated.jsm", {}).Deprecated;
let msg = "PrintUtils.print is now deprecated. Please use PrintUtils.printWindow.";
let url = "https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XUL/Printing";
Deprecated.warning(msg, url);
this.printWindow(windowID, browser);
},
/**
* Initializes print preview.
*
* @param aListenerObj
* An object that defines the following functions:
*
* getPrintPreviewBrowser:
* Returns the <xul:browser> to display the print preview in. This
* <xul:browser> must have its type attribute set to "content",
* "content-targetable", or "content-primary".
*
* getSourceBrowser:
* Returns the <xul:browser> that contains the document being
* printed. This <xul:browser> must have its type attribute set to
* "content", "content-targetable", or "content-primary".
*
* getNavToolbox:
* Returns the primary toolbox for this window.
*
* onEnter:
* Called upon entering print preview.
*
* onExit:
* Called upon exiting print preview.
*
* These methods must be defined. printPreview can be called
* with aListenerObj as null iff this window is already displaying
* print preview (in which case, the previous aListenerObj passed
* to it will be used).
*/
printPreview: function (aListenerObj)
{
// if we're already in PP mode, don't set the listener; chances
// are it is null because someone is calling printPreview() to
// get us to refresh the display.
if (!this.inPrintPreview) {
this._listener = aListenerObj;
this._sourceBrowser = aListenerObj.getSourceBrowser();
this._originalTitle = this._sourceBrowser.contentTitle;
this._originalURL = this._sourceBrowser.currentURI.spec;
} else {
// collapse the browser here -- it will be shown in
// enterPrintPreview; this forces a reflow which fixes display
// issues in bug 267422.
this._sourceBrowser = this._listener.getPrintPreviewBrowser();
this._sourceBrowser.collapsed = true;
}
this._webProgressPP = {};
let ppParams = {};
let notifyOnOpen = {};
let printSettings = this.getPrintSettings();
// Here we get the PrintingPromptService so we can display the PP Progress from script
// For the browser implemented via XUL with the PP toolbar we cannot let it be
// automatically opened from the print engine because the XUL scrollbars in the PP window
// will layout before the content window and a crash will occur.
// Doing it all from script, means it lays out before hand and we can let printing do its own thing
let PPROMPTSVC = Components.classes["@mozilla.org/embedcomp/printingprompt-service;1"]
.getService(Components.interfaces.nsIPrintingPromptService);
// just in case we are already printing,
// an error code could be returned if the Progress Dialog is already displayed
try {
PPROMPTSVC.showProgress(window, null, printSettings, this._obsPP, false,
this._webProgressPP, ppParams, notifyOnOpen);
if (ppParams.value) {
ppParams.value.docTitle = this._originalTitle;
ppParams.value.docURL = this._originalURL;
}
// this tells us whether we should continue on with PP or
// wait for the callback via the observer
if (!notifyOnOpen.value.valueOf() || this._webProgressPP.value == null) {
this.enterPrintPreview();
}
} catch (e) {
this.enterPrintPreview();
}
},
/**
* Returns the nsIWebBrowserPrint associated with some content window.
* This method is being kept here for compatibility reasons, but should not
* be called by code hoping to support e10s / remote browsers.
*
* @param aWindow
* The window from which to get the nsIWebBrowserPrint from.
* @return nsIWebBrowserPrint
*/
getWebBrowserPrint: function (aWindow)
{
let Deprecated = Components.utils.import("resource://gre/modules/Deprecated.jsm", {}).Deprecated;
let text = "getWebBrowserPrint is now deprecated, and fully unsupported for " +
"multi-process browsers. Please use a frame script to get " +
"access to nsIWebBrowserPrint from content.";
let url = "https://developer.mozilla.org/en-US/docs/Printing_from_a_XUL_App";
Deprecated.warning(text, url);
if (this.usingRemoteTabs) {
return {};
}
var contentWindow = aWindow || window.content;
return contentWindow.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIWebBrowserPrint);
},
/**
* Returns the nsIWebBrowserPrint from the print preview browser's docShell.
* This method is being kept here for compatibility reasons, but should not
* be called by code hoping to support e10s / remote browsers.
*
* @return nsIWebBrowserPrint
*/
getPrintPreview: function() {
let Deprecated = Components.utils.import("resource://gre/modules/Deprecated.jsm", {}).Deprecated;
let text = "getPrintPreview is now deprecated, and fully unsupported for " +
"multi-process browsers. Please use a frame script to get " +
"access to nsIWebBrowserPrint from content.";
let url = "https://developer.mozilla.org/en-US/docs/Printing_from_a_XUL_App";
Deprecated.warning(text, url);
if (this.usingRemoteTabs) {
return {};
}
return this._listener.getPrintPreviewBrowser().docShell.printPreview;
},
get inPrintPreview() {
return document.getElementById("print-preview-toolbar") != null;
},
////////////////////////////////////////////////////
// "private" methods and members. Don't use them. //
///////////////////////////////////////////////////
_listener: null,
_closeHandlerPP: null,
_webProgressPP: null,
_sourceBrowser: null,
_originalTitle: "",
_originalURL: "",
get usingRemoteTabs() {
// We memoize this, since it's highly unlikely to change over the lifetime
// of the window.
let usingRemoteTabs =
window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIWebNavigation)
.QueryInterface(Components.interfaces.nsILoadContext)
.useRemoteTabs;
delete this.usingRemoteTabs;
return this.usingRemoteTabs = usingRemoteTabs;
},
displayPrintingError(nsresult, isPrinting) {
// The nsresults from a printing error are mapped to strings that have
// similar names to the errors themselves. For example, for error
// NS_ERROR_GFX_PRINTER_NO_PRINTER_AVAILABLE, the name of the string
// for the error message is: PERR_GFX_PRINTER_NO_PRINTER_AVAILABLE. What's
// more, if we're in the process of doing a print preview, it's possible
// that there are strings specific for print preview for these errors -
// if so, the names of those strings have _PP as a suffix. It's possible
// that no print preview specific strings exist, in which case it is fine
// to fall back to the original string name.
const MSG_CODES = [
"GFX_PRINTER_NO_PRINTER_AVAILABLE",
"GFX_PRINTER_NAME_NOT_FOUND",
"GFX_PRINTER_COULD_NOT_OPEN_FILE",
"GFX_PRINTER_STARTDOC",
"GFX_PRINTER_ENDDOC",
"GFX_PRINTER_STARTPAGE",
"GFX_PRINTER_DOC_IS_BUSY",
"ABORT",
"NOT_AVAILABLE",
"NOT_IMPLEMENTED",
"OUT_OF_MEMORY",
"UNEXPECTED",
];
// PERR_FAILURE is the catch-all error message if we've gotten one that
// we don't recognize.
msgName = "PERR_FAILURE";
for (let code of MSG_CODES) {
let nsErrorResult = "NS_ERROR_" + code;
if (Components.results[nsErrorResult] == nsresult) {
msgName = "PERR_" + code;
break;
}
}
let msg, title;
if (!isPrinting) {
// Try first with _PP suffix.
let ppMsgName = msgName + "_PP";
try {
msg = this.bundle.GetStringFromName(ppMsgName);
} catch(e) {
// We allow localizers to not have the print preview error string,
// and just fall back to the printing error string.
}
}
if (!msg) {
msg = this.bundle.GetStringFromName(msgName);
}
title = this.bundle.GetStringFromName(isPrinting ? "print_error_dialog_title"
: "printpreview_error_dialog_title");
let promptSvc = Components.classes["@mozilla.org/embedcomp/prompt-service;1"]
.getService(Components.interfaces.nsIPromptService);
promptSvc.alert(window, title, msg);
},
receiveMessage(aMessage) {
if (aMessage.name == "Printing:Error") {
this.displayPrintingError(aMessage.data.nsresult,
aMessage.data.isPrinting);
return;
}
// If we got here, then the message we've received must involve
// updating the print progress UI.
if (!this._webProgressPP.value) {
// We somehow didn't get a nsIWebProgressListener to be updated...
// I guess there's nothing to do.
return;
}
let listener = this._webProgressPP.value;
let mm = aMessage.target.messageManager;
let data = aMessage.data;
switch (aMessage.name) {
case "Printing:Preview:ProgressChange": {
return listener.onProgressChange(null, null,
data.curSelfProgress,
data.maxSelfProgress,
data.curTotalProgress,
data.maxTotalProgress);
break;
}
case "Printing:Preview:StateChange": {
if (data.stateFlags & Components.interfaces.nsIWebProgressListener.STATE_STOP) {
// Strangely, the printing engine sends 2 STATE_STOP messages when
// print preview is finishing. One has the STATE_IS_DOCUMENT flag,
// the other has the STATE_IS_NETWORK flag. However, the webProgressPP
// listener stops listening once the first STATE_STOP is sent.
// Any subsequent messages result in NS_ERROR_FAILURE errors getting
// thrown. This should all get torn out once bug 1088061 is fixed.
mm.removeMessageListener("Printing:Preview:StateChange", this);
mm.removeMessageListener("Printing:Preview:ProgressChange", this);
}
return listener.onStateChange(null, null,
data.stateFlags,
data.status);
break;
}
}
},
setPrinterDefaultsForSelectedPrinter: function (aPSSVC, aPrintSettings)
{
if (!aPrintSettings.printerName)
aPrintSettings.printerName = aPSSVC.defaultPrinterName;
// First get any defaults from the printer
aPSSVC.initPrintSettingsFromPrinter(aPrintSettings.printerName, aPrintSettings);
// now augment them with any values from last time
aPSSVC.initPrintSettingsFromPrefs(aPrintSettings, true, aPrintSettings.kInitSaveAll);
},
getPrintSettings: function ()
{
var pref = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefBranch);
if (pref) {
gPrintSettingsAreGlobal = pref.getBoolPref("print.use_global_printsettings", false);
gSavePrintSettings = pref.getBoolPref("print.save_print_settings", false);
}
var printSettings;
try {
var PSSVC = Components.classes["@mozilla.org/gfx/printsettings-service;1"]
.getService(Components.interfaces.nsIPrintSettingsService);
if (gPrintSettingsAreGlobal) {
printSettings = PSSVC.globalPrintSettings;
this.setPrinterDefaultsForSelectedPrinter(PSSVC, printSettings);
} else {
printSettings = PSSVC.newPrintSettings;
}
} catch (e) {
dump("getPrintSettings: "+e+"\n");
}
return printSettings;
},
// This observer is called once the progress dialog has been "opened"
_obsPP:
{
observe: function(aSubject, aTopic, aData)
{
// delay the print preview to show the content of the progress dialog
setTimeout(function () { PrintUtils.enterPrintPreview(); }, 0);
},
QueryInterface : function(iid)
{
if (iid.equals(Components.interfaces.nsIObserver) ||
iid.equals(Components.interfaces.nsISupportsWeakReference) ||
iid.equals(Components.interfaces.nsISupports))
return this;
throw Components.results.NS_NOINTERFACE;
}
},
enterPrintPreview: function ()
{
// Send a message to the print preview browser to initialize
// print preview. If we happen to have gotten a print preview
// progress listener from nsIPrintingPromptService.showProgress
// in printPreview, we add listeners to feed that progress
// listener.
let ppBrowser = this._listener.getPrintPreviewBrowser();
let mm = ppBrowser.messageManager;
mm.sendAsyncMessage("Printing:Preview:Enter", {
windowID: this._sourceBrowser.outerWindowID,
});
if (this._webProgressPP.value) {
mm.addMessageListener("Printing:Preview:StateChange", this);
mm.addMessageListener("Printing:Preview:ProgressChange", this);
}
let onEntered = (message) => {
mm.removeMessageListener("Printing:PrintPreview:Entered", onEntered);
if (message.data.failed) {
// Something went wrong while putting the document into print preview
// mode. Bail out.
this._listener.onEnter();
this._listener.onExit();
return;
}
// Stash the focused element so that we can return to it after exiting
// print preview.
gFocusedElement = document.commandDispatcher.focusedElement;
let printPreviewTB = document.getElementById("print-preview-toolbar");
if (printPreviewTB) {
printPreviewTB.updateToolbar();
ppBrowser.collapsed = false;
ppBrowser.focus();
return;
}
// Set the original window as an active window so any mozPrintCallbacks can
// run without delayed setTimeouts.
this._sourceBrowser.docShellIsActive = true;
// show the toolbar after we go into print preview mode so
// that we can initialize the toolbar with total num pages
const XUL_NS =
"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
printPreviewTB = document.createElementNS(XUL_NS, "toolbar");
printPreviewTB.setAttribute("printpreview", true);
printPreviewTB.id = "print-preview-toolbar";
let navToolbox = this._listener.getNavToolbox();
navToolbox.parentNode.insertBefore(printPreviewTB, navToolbox);
printPreviewTB.initialize(ppBrowser);
// copy the window close handler
if (document.documentElement.hasAttribute("onclose"))
this._closeHandlerPP = document.documentElement.getAttribute("onclose");
else
this._closeHandlerPP = null;
document.documentElement.setAttribute("onclose", "PrintUtils.exitPrintPreview(); return false;");
// disable chrome shortcuts...
window.addEventListener("keydown", this.onKeyDownPP, true);
window.addEventListener("keypress", this.onKeyPressPP, true);
ppBrowser.collapsed = false;
ppBrowser.focus();
// on Enter PP Call back
this._listener.onEnter();
};
mm.addMessageListener("Printing:Preview:Entered", onEntered);
},
exitPrintPreview: function ()
{
let ppBrowser = this._listener.getPrintPreviewBrowser();
let browserMM = ppBrowser.messageManager;
browserMM.sendAsyncMessage("Printing:Preview:Exit");
window.removeEventListener("keydown", this.onKeyDownPP, true);
window.removeEventListener("keypress", this.onKeyPressPP, true);
// restore the old close handler
document.documentElement.setAttribute("onclose", this._closeHandlerPP);
this._closeHandlerPP = null;
// remove the print preview toolbar
let printPreviewTB = document.getElementById("print-preview-toolbar");
this._listener.getNavToolbox().parentNode.removeChild(printPreviewTB);
let fm = Components.classes["@mozilla.org/focus-manager;1"]
.getService(Components.interfaces.nsIFocusManager);
if (gFocusedElement)
fm.setFocus(gFocusedElement, fm.FLAG_NOSCROLL);
else
this._sourceBrowser.focus();
gFocusedElement = null;
this._listener.onExit();
},
onKeyDownPP: function (aEvent)
{
// Esc exits the PP
if (aEvent.keyCode == aEvent.DOM_VK_ESCAPE) {
PrintUtils.exitPrintPreview();
}
},
onKeyPressPP: function (aEvent)
{
var closeKey;
try {
closeKey = document.getElementById("key_close")
.getAttribute("key");
closeKey = aEvent["DOM_VK_"+closeKey];
} catch (e) {}
var isModif = aEvent.ctrlKey || aEvent.metaKey;
// Ctrl-W exits the PP
if (isModif &&
(aEvent.charCode == closeKey || aEvent.charCode == closeKey + 32)) {
PrintUtils.exitPrintPreview();
}
else if (isModif) {
var printPreviewTB = document.getElementById("print-preview-toolbar");
var printKey = document.getElementById("printKb").getAttribute("key").toUpperCase();
var pressedKey = String.fromCharCode(aEvent.charCode).toUpperCase();
if (printKey == pressedKey) {
printPreviewTB.print();
}
}
// cancel shortkeys
if (isModif) {
aEvent.preventDefault();
aEvent.stopPropagation();
}
}
}
PrintUtils.init();