document: support non-dirty fields

Fixes #171

Author: tbaliance

_examples/document/page-numbers/main.go

@@ -0,0 +1,34 @@
+// Copyright 2018 Baliance. All rights reserved.
+package main
+
+import (
+	"baliance.com/gooxml/document"
+	"baliance.com/gooxml/measurement"
+	"baliance.com/gooxml/schema/soo/wml"
+)
+
+var lorem = `Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin lobortis, lectus dictum feugiat tempus, sem neque finibus enim, sed eleifend sem nunc ac diam. Vestibulum tempus sagittis elementum`
+
+func main() {
+	doc := document.New()
+
+	ftr := doc.AddFooter()
+	para := ftr.AddParagraph()
+	para.Properties().AddTabStop(3*measurement.Inch, wml.ST_TabJcCenter, wml.ST_TabTlcNone)
+
+	run := para.AddRun()
+	run.AddTab()
+	run.AddFieldWithFormatting(document.FieldCurrentPage, "", false)
+	run.AddText(" of ")
+	run.AddFieldWithFormatting(document.FieldNumberOfPages, "", false)
+	doc.BodySection().SetFooter(ftr, wml.ST_HdrFtrDefault)
+
+	for i := 0; i < 20; i++ {
+		para := doc.AddParagraph()
+		for j := 0; j < 5; j++ {
+			run := para.AddRun()
+			run.AddText(lorem)
+		}
+	}
+	doc.SaveToFile("page-numbers.docx")
+}

document/run.go

@@ -85,12 +85,14 @@ func (r Run) AddTab() {
 
 // AddFieldWithFormatting adds a field (automatically computed text) to the
 // document with field specifc formatting.
-func (r Run) AddFieldWithFormatting(code string, fmt string) {
+func (r Run) AddFieldWithFormatting(code string, fmt string, isDirty bool) {
 	ic := r.newIC()
 	ic.FldChar = wml.NewCT_FldChar()
 	ic.FldChar.FldCharTypeAttr = wml.ST_FldCharTypeBegin
-	ic.FldChar.DirtyAttr = &sharedTypes.ST_OnOff{}
-	ic.FldChar.DirtyAttr.Bool = gooxml.Bool(true)
+	if isDirty {
+		ic.FldChar.DirtyAttr = &sharedTypes.ST_OnOff{}
+		ic.FldChar.DirtyAttr.Bool = gooxml.Bool(true)
+	}
 
 	ic = r.newIC()
 	ic.InstrText = wml.NewCT_Text()
@@ -107,7 +109,7 @@ func (r Run) AddFieldWithFormatting(code string, fmt string) {
 
 // AddField adds a field (automatically computed text) to the document.
 func (r Run) AddField(code string) {
-	r.AddFieldWithFormatting(code, "")
+	r.AddFieldWithFormatting(code, "", true)
 }
 
 // Properties returns the run properties.