Forms: implement javascript Field.display property

4 files changed, 153 insertions, 0 deletions

diff --git a/pdf/mupdf-internal.h b/pdf/mupdf-internal.h
index ec44a2f4..9229bf2d 100644
--- a/pdf/mupdf-internal.h
+++ b/pdf/mupdf-internal.h
@@ -573,6 +573,8 @@ void pdf_field_setBorderStyle(pdf_document *doc, pdf_obj *field, char *text);
 void pdf_field_buttonSetCaption(pdf_document *doc, pdf_obj *field, char *text);
 void pdf_field_setFillColor(pdf_document *doc, pdf_obj *field, pdf_obj *col);
 void pdf_field_setTextColor(pdf_document *doc, pdf_obj *field, pdf_obj *col);
+int pdf_field_getDisplay(pdf_document *doc, pdf_obj *field);
+void pdf_field_setDisplay(pdf_document *doc, pdf_obj *field, int d);
 
 /*
  * Page tree, pages and related objects
diff --git a/pdf/pdf_form.c b/pdf/pdf_form.c
index 1a902df3..f0d06177 100644
--- a/pdf/pdf_form.c
+++ b/pdf/pdf_form.c
@@ -23,6 +23,20 @@ enum
 
 enum
 {
+	F_Invisible = 1 << (1-1),
+	F_Hidden = 1 << (2-1),
+	F_Print = 1 << (3-1),
+	F_NoZoom = 1 << (4-1),
+	F_NoRotate = 1 << (5-1),
+	F_NoView = 1 << (6-1),
+	F_ReadOnly = 1 << (7-1),
+	F_Locked = 1 << (8-1),
+	F_ToggleNoView = 1 << (9-1),
+	F_LockedContents = 1 << (10-1)
+};
+
+enum
+{
 	BS_Solid,
 	BS_Dashed,
 	BS_Beveled,
@@ -30,6 +44,16 @@ enum
 	BS_Underline
 };
 
+/* Must be kept in sync with definitions in pdf_util.js */
+enum
+{
+	Display_Visible,
+	Display_Hidden,
+	Display_NoPrint,
+	Display_NoView
+};
+
+
 enum
 {
 	Q_Left  = 0,
@@ -1997,6 +2021,89 @@ void pdf_field_buttonSetCaption(pdf_document *doc, pdf_obj *field, char *text)
 	}
 }
 
+int pdf_field_getDisplay(pdf_document *doc, pdf_obj *field)
+{
+	pdf_obj *kids;
+	int f, res = Display_Visible;
+
+	/* Base response on first of children. Not ideal,
+	 * but not clear how to handle children with
+	 * differing values */
+	while ((kids = pdf_dict_gets(field, "Kids")) != NULL)
+		field = pdf_array_get(kids, 0);
+
+	f = pdf_to_int(pdf_dict_gets(field, "F"));
+
+	if (f & F_Hidden)
+	{
+		res = Display_Hidden;
+	}
+	else if (f & F_Print)
+	{
+		if (f & F_NoView)
+			res = Display_NoView;
+	}
+	else
+	{
+		if (f & F_NoView)
+			res = Display_Hidden;
+		else
+			res = Display_NoPrint;
+	}
+
+	return res;
+}
+
+void pdf_field_setDisplay(pdf_document *doc, pdf_obj *field, int d)
+{
+	fz_context *ctx = doc->ctx;
+	pdf_obj *kids = pdf_dict_gets(field, "Kids");
+
+	if (!kids)
+	{
+		int mask = (F_Hidden|F_Print|F_NoView);
+		int f = pdf_to_int(pdf_dict_gets(field, "F")) & ~mask;
+		pdf_obj *fo = NULL;
+
+		switch (d)
+		{
+		case Display_Visible:
+			f |= F_Print;
+			break;
+		case Display_Hidden:
+			f |= F_Hidden;
+			break;
+		case Display_NoView:
+			f |= (F_Print|F_NoView);
+			break;
+		case Display_NoPrint:
+			break;
+		}
+
+		fz_var(fo);
+		fz_try(ctx)
+		{
+			fo = pdf_new_int(ctx, f);
+			pdf_dict_puts(field, "F", fo);
+		}
+		fz_always(ctx)
+		{
+			pdf_drop_obj(fo);
+		}
+		fz_catch(ctx)
+		{
+			fz_rethrow(ctx);
+		}
+	}
+	else
+	{
+		int i, n = pdf_array_len(kids);
+
+		for (i = 0; i < n; i++)
+			pdf_field_setDisplay(doc, pdf_array_get(kids, i), d);
+	}
+}
+
 void pdf_field_setFillColor(pdf_document *doc, pdf_obj *field, pdf_obj *col)
 {
 	pdf_dict_putp(field, "MK/BG", col);
diff --git a/pdf/pdf_js.c b/pdf/pdf_js.c
index 000a3837..f533b834 100644
--- a/pdf/pdf_js.c
+++ b/pdf/pdf_js.c
@@ -67,6 +67,43 @@ static pdf_jsimp_obj *field_buttonSetCaption(void *jsctx, void *obj, int argc, p
 	return NULL;
 }
 
+static pdf_jsimp_obj *field_getDisplay(void *jsctx, void *obj)
+{
+	pdf_js *js = (pdf_js *)jsctx;
+	fz_context *ctx = js->doc->ctx;
+	pdf_obj *field = (pdf_obj *)obj;
+	pdf_jsimp_obj *res = NULL;
+
+	fz_try(ctx)
+	{
+		int d = pdf_field_getDisplay(js->doc, field);
+		res = pdf_jsimp_fromNumber(js->imp, (double)d);
+	}
+	fz_catch(ctx)
+	{
+		fz_warn(ctx, "%s", ctx->error->message);
+	}
+
+	return res;
+}
+
+static void field_setDisplay(void *jsctx, void *obj, pdf_jsimp_obj *val)
+{
+	pdf_js *js = (pdf_js *)jsctx;
+	fz_context *ctx = js->doc->ctx;
+	pdf_obj *field = (pdf_obj *)obj;
+
+	fz_try(ctx)
+	{
+		int ival = (int)pdf_jsimp_toNumber(js->imp, val);
+		pdf_field_setDisplay(js->doc, field, ival);
+	}
+	fz_catch(ctx)
+	{
+		fz_warn(ctx, "%s", ctx->error->message);
+	}
+}
+
 static pdf_jsimp_obj *field_getFillColor(void *jsctx, void *obj)
 {
 	return NULL;
@@ -363,6 +400,7 @@ static void declare_dom(pdf_js *js)
 	pdf_jsimp_addproperty(imp, js->fieldtype, "borderStyle", field_getBorderStyle, field_setBorderStyle);
 	pdf_jsimp_addproperty(imp, js->fieldtype, "textColor", field_getTextColor, field_setTextColor);
 	pdf_jsimp_addproperty(imp, js->fieldtype, "fillColor", field_getFillColor, field_setFillColor);
+	pdf_jsimp_addproperty(imp, js->fieldtype, "display", field_getDisplay, field_setDisplay);
 	pdf_jsimp_addmethod(imp, js->fieldtype, "buttonSetCaption", field_buttonSetCaption);
 
 	/* Create the app type */
diff --git a/pdf/pdf_util.js b/pdf/pdf_util.js
index 536016b9..e8edeb66 100644
--- a/pdf/pdf_util.js
+++ b/pdf/pdf_util.js
@@ -31,6 +31,12 @@ MuPDF.convertCase = function(str,cmd)
 	}
 }
 
+/* display must be kept in sync with an enum in pdf_form.c */
+var display = new Array();
+display.visible = 0;
+display.hidden = 1;
+display.noPrint = 2;
+display.noView = 3;
 var border = new Array();
 border.s = "Solid";
 border.d = "Dashed";