Add default link style to paragraph

pdf/creator/styled_paragraph.go

@@ -26,6 +26,9 @@ type StyledParagraph struct {
 	// Style used for the paragraph for spacing and offsets.
 	defaultStyle TextStyle
 
+	// Style used for the paragraph link annotations.
+	defaultLinkStyle TextStyle
+
 	// Text alignment: Align left/right/center/justify.
 	alignment TextAlignment
 
@@ -68,9 +71,10 @@ type StyledParagraph struct {
 // newStyledParagraph creates a new styled paragraph.
 func newStyledParagraph(style TextStyle) *StyledParagraph {
 	// TODO: Can we wrap intellectually, only if given width is known?
-	p := &StyledParagraph{
+	return &StyledParagraph{
 		chunks:           []*TextChunk{},
 		defaultStyle:     style,
+		defaultLinkStyle: newLinkStyle(style.Font),
 		lineHeight:       1.0,
 		alignment:        TextAlignmentLeft,
 		enableWrap:       true,
@@ -80,8 +84,6 @@ func newStyledParagraph(style TextStyle) *StyledParagraph {
 		scaleY:           1,
 		positioning:      positionRelative,
 	}
-
-	return p
 }
 
 // Append adds a new text chunk to the paragraph.
@@ -108,7 +110,7 @@ func (p *StyledParagraph) Insert(index uint, text string) *TextChunk {
 // The text parameter represents the text that is displayed and the url
 // parameter sets the destionation of the link.
 func (p *StyledParagraph) AddExternalLink(text, url string) *TextChunk {
-	chunk := newTextChunk(text, p.defaultStyle)
+	chunk := newTextChunk(text, p.defaultLinkStyle)
 	chunk.annotation = newExternalLinkAnnotation(url)
 	return p.appendChunk(chunk)
 }
@@ -120,7 +122,7 @@ func (p *StyledParagraph) AddExternalLink(text, url string) *TextChunk {
 // The zoom of the destination page is controlled with the zoom
 // parameter. Pass in 0 to keep the current zoom value.
 func (p *StyledParagraph) AddInternalLink(text string, page int64, x, y, zoom float64) *TextChunk {
-	chunk := newTextChunk(text, p.defaultStyle)
+	chunk := newTextChunk(text, p.defaultLinkStyle)
 	chunk.annotation = newInternalLinkAnnotation(page-1, x, y, zoom)
 	return p.appendChunk(chunk)
 }

pdf/creator/text_style.go

@@ -29,3 +29,13 @@ func newTextStyle(font *model.PdfFont) TextStyle {
 		FontSize: 10,
 	}
 }
+
+// newLinkStyle creates a new text style object which can be
+// used for link annotations.
+func newLinkStyle(font *model.PdfFont) TextStyle {
+	return TextStyle{
+		Color:    ColorRGBFrom8bit(0, 0, 238),
+		Font:     font,
+		FontSize: 10,
+	}
+}