Implement progress dialog for printing and PP that show before reflow

Bug 154136 r=dcone/sgehani sr=alecf

suite/browser/browser.js

@@ -45,6 +45,7 @@ var gPrintSettings = null;
 var gChromeState = null; // chrome state before we went into print preview
 var gOldCloseHandler = null; // close handler before we went into print preview
 var gInPrintPreviewMode = false;
+var gWebProgress        = null;
 
 function getWebNavigation()
 {
@@ -205,32 +206,95 @@ function GetPrintSettings()
   return gPrintSettings;
 }
 
+// This observer is called once the progress dialog has been "opened"
+var gPrintPreviewObs = {
+    observe: function(aSubject, aTopic, aData)
+    {
+      setTimeout(FinishPrintPreview, 0);
+    },
+
+    QueryInterface : function(iid)
+    {
+     if (iid.equals(Components.interfaces.nsIObserver) || iid.equals(Components.interfaces.nsISupportsWeakReference))
+      return this;
+     
+     throw Components.results.NS_NOINTERFACE;
+    }
+};
+
 function BrowserPrintPreview()
+{
+  var ifreq;
+  var webBrowserPrint;  
+  try {
+    ifreq = _content.QueryInterface(Components.interfaces.nsIInterfaceRequestor);
+    webBrowserPrint = ifreq.getInterface(Components.interfaces.nsIWebBrowserPrint);     
+    gPrintSettings = GetPrintSettings();
+
+  } catch (e) {
+    // Pressing cancel is expressed as an NS_ERROR_ABORT return value,
+    // causing an exception to be thrown which we catch here.
+    // Unfortunately this will also consume helpful failures, so add a
+    // dump(e); // if you need to debug
+  }
+
+  // Here we get the PrintingPromptService tso 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 it's own thing
+  gWebProgress = new Object();
+
+  var printPreviewParams    = new Object();
+  var notifyOnOpen          = new Object();
+  var printingPromptService = Components.classes["@mozilla.org/embedcomp/printingprompt-service;1"]
+                                  .getService(Components.interfaces.nsIPrintingPromptService);
+  if (printingPromptService) {
+    // just in case we are already printing, 
+    // an error code could be returned if the Prgress Dialog is already displayed
+    try {
+      printingPromptService.showProgress(this, webBrowserPrint, gPrintSettings, gPrintPreviewObs, false, gWebProgress, 
+                                         printPreviewParams, notifyOnOpen);
+      if (printPreviewParams.value) {
+        var webNav = getWebNavigation();
+        printPreviewParams.value.docTitle = webNav.document.title;
+        printPreviewParams.value.docURL   = webNav.currentURI.spec;
+      }
+
+      // this tells us whether we should continue on with PP or 
+      // wait for the callback via the observer
+      if (!notifyOnOpen.value.valueOf() || gWebProgress.value == null) {
+        FinishPrintPreview();
+      }
+    } catch (e) {}
+  }
+}
+
+function FinishPrintPreview()
 {
   gInPrintPreviewMode = true;
 
   var browser = getBrowser();
-  browser.setAttribute("handleCtrlPageUpDown", "false");
-
-  var mainWin = document.getElementById("main-window");
-
-  // save previous close handler to restoreon exiting print preview mode
-  if (mainWin.hasAttribute("onclose"))
-    gOldCloseHandler = mainWin.getAttribute("onclose");
-  else
-    gOldCloseHandler = null;
-  mainWin.setAttribute("onclose", "BrowserExitPrintPreview(); return false;");
- 
   try {
-    var ifreq = _content.QueryInterface(
-      Components.interfaces.nsIInterfaceRequestor);
-    var webBrowserPrint = ifreq.getInterface(
-      Components.interfaces.nsIWebBrowserPrint);     
+    var ifreq = _content.QueryInterface(Components.interfaces.nsIInterfaceRequestor);
+    var webBrowserPrint = ifreq.getInterface(Components.interfaces.nsIWebBrowserPrint);     
     if (webBrowserPrint) {
       gPrintSettings = GetPrintSettings();
-      webBrowserPrint.printPreview(gPrintSettings, null, null);
+      webBrowserPrint.printPreview(gPrintSettings, null, gWebProgress.value);
     }
 
+    browser.setAttribute("handleCtrlPageUpDown", "false");
+
+    var mainWin = document.getElementById("main-window");
+
+    // save previous close handler to restoreon exiting print preview mode
+    if (mainWin.hasAttribute("onclose"))
+      gOldCloseHandler = mainWin.getAttribute("onclose");
+    else
+      gOldCloseHandler = null;
+    mainWin.setAttribute("onclose", "BrowserExitPrintPreview(); return false;");
+ 
     // show the toolbar after we go into print preview mode so
     // that we can initialize the toolbar with total num pages
     showPrintPreviewToolbar();
@@ -264,9 +328,6 @@ function BrowserPrintSetup()
                                             .getService(Components.interfaces.nsIPrintSettingsService);
           psService.savePrintSettingsToPrefs(gPrintSettings, false, gPrintSettings.kInitSaveNativeData);
         }
-        if (webBrowserPrint.doingPrintPreview) {
-          webBrowserPrint.printPreview(gPrintSettings, null, null);
-        }
       }
     }
   } catch (e) {