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Copy pathdocument.go
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532 lines (457 loc) · 13.1 KB
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package pdf
import (
"bytes"
"io"
. "github.com/tinywasm/fmt"
"github.com/tinywasm/pdf/fpdf"
)
// fontEntry holds a font registration request.
type fontEntry struct {
family string
style string // "", "B", "I", "BI"
path string
allStyles bool // when true, register the file for all four styles
}
// Document wraps the internal fpdf.Fpdf to provide a fluent API.
type Document struct {
internal *fpdf.Fpdf
logger func(message ...any)
// Resource registries
fonts []fontEntry
images []KeyValue // name -> path
fontFamily string
theme Theme
err error
}
// DefaultFontPath is the default path to the Arial UTF-8 font.
const DefaultFontPath = "fonts/Arial.ttf"
type Option func(*Document)
func WithLogger(fn func(...any)) Option {
return func(d *Document) {
d.logger = fn
}
}
func WithPageSize(w, h float64, unit string) Option {
return func(d *Document) {
// unit is ignored for now as fpdf is initialized with mm by default
// but we could recreate internal if needed.
// For now let's assume mm.
}
}
func WithMargins(left, top, right, bottom float64) Option {
return func(d *Document) {
d.internal.SetMargins(left, top, right)
d.internal.SetAutoPageBreak(true, bottom)
}
}
func WithDefaultFont(family, path string) Option {
return func(d *Document) {
d.fontFamily = family
// We can't load it here easily because it might need d.readFile
// which is initialized after options? No, it's initialized in initIO.
}
}
// NewDocument creates a new Document instance with UTF-8 support.
func NewDocument(opts ...Option) *Document {
d := &Document{
fonts: []fontEntry{},
images: []KeyValue{},
fontFamily: "Arial",
theme: DefaultTheme,
}
d.initIO() // initializes logger + IO depending on build tag
d.internal = fpdf.New(
fpdf.WriteFileFunc(d.writeFile),
fpdf.ReadFileFunc(d.readFile),
fpdf.FileSizeFunc(d.fileSize),
)
d.internal.SetMargins(20, 20, 20)
d.internal.SetAutoPageBreak(true, 20)
for _, opt := range opts {
opt(d)
}
d.loadDefaultFont()
return d
}
// loadDefaultFont loads Arial as UTF-8 font so the default "Arial" supports unicode.
func (d *Document) loadDefaultFont() {
data, err := d.readFile(DefaultFontPath)
if err != nil {
return // fallback to built-in Arial (Latin-1 only)
}
d.addUTF8FontAllStyles(d.fontFamily, data)
}
// SetTheme sets the document theme. Missing numeric fields (Sizes, Spacing)
// inherit from DefaultTheme so callers can specify only the colors they care
// about without producing zero-height text.
func (d *Document) SetTheme(theme Theme) *Document {
if theme.Sizes.H1 == 0 {
theme.Sizes.H1 = DefaultTheme.Sizes.H1
}
if theme.Sizes.H2 == 0 {
theme.Sizes.H2 = DefaultTheme.Sizes.H2
}
if theme.Sizes.H3 == 0 {
theme.Sizes.H3 = DefaultTheme.Sizes.H3
}
if theme.Sizes.Body == 0 {
theme.Sizes.Body = DefaultTheme.Sizes.Body
}
if theme.Sizes.Small == 0 {
theme.Sizes.Small = DefaultTheme.Sizes.Small
}
if theme.Spacing.Paragraph == 0 {
theme.Spacing.Paragraph = DefaultTheme.Spacing.Paragraph
}
if theme.Spacing.Section == 0 {
theme.Spacing.Section = DefaultTheme.Spacing.Section
}
if theme.Spacing.Page == 0 {
theme.Spacing.Page = DefaultTheme.Spacing.Page
}
d.theme = theme
if theme.FontFamily != "" {
d.fontFamily = theme.FontFamily
}
if theme.Page.Width > 0 && theme.Page.Height > 0 {
d.internal.SetPageSizeMM(theme.Page.Width, theme.Page.Height)
}
if theme.Margin.Top > 0 || theme.Margin.Right > 0 || theme.Margin.Bottom > 0 || theme.Margin.Left > 0 {
m := theme.Margin
d.internal.SetMargins(m.Left, m.Top, m.Right)
d.internal.SetAutoPageBreak(true, m.Bottom)
}
return d
}
// Err returns the first accumulated error.
func (d *Document) Err() error {
return d.err
}
func (d *Document) addError(err error) {
if d.err == nil && err != nil {
d.err = err
}
}
// SetDefaultFont sets the default font family for the document.
func (d *Document) SetDefaultFont(family string) *Document {
d.fontFamily = family
return d
}
// addUTF8FontAllStyles registers a TTF font for all styles (regular, bold, italic, bold-italic).
func (d *Document) addUTF8FontAllStyles(family string, data []byte) {
for _, style := range []string{"", "B", "I", "BI"} {
d.internal.AddUTF8FontFromBytes(family, style, data)
}
}
// SetLog sets the logger function.
func (d *Document) SetLog(fn func(...any)) *Document {
d.logger = fn
return d
}
// Log writes a message to the logger.
func (d *Document) Log(message ...any) {
if d.logger != nil {
d.logger(message...)
}
}
// kvGet retrieves a value from a KeyValue slice by key.
// Note: This helper is currently available for future use in resource lookups.
func kvGet(kv []KeyValue, key string) (string, bool) {
for i := range kv {
if kv[i].Key == key {
return kv[i].Value, true
}
}
return "", false
}
// RegisterFont registers a TTF font for all styles (regular, bold, italic, bold-italic).
func (d *Document) RegisterFont(family, path string) *Document {
d.fonts = append(d.fonts, fontEntry{family: family, path: path, allStyles: true})
return d
}
// RegisterFontStyle registers a TTF font for a specific style ("", "B", "I", "BI").
func (d *Document) RegisterFontStyle(family, style, path string) *Document {
d.fonts = append(d.fonts, fontEntry{family: family, style: style, path: path})
return d
}
// RegisterImage registers an image to be loaded.
func (d *Document) RegisterImage(name, path string) *Document {
d.images = append(d.images, KeyValue{Key: name, Value: path})
return d
}
// Load loads all registered resources.
func (d *Document) Load(cb func(error)) {
for i := range d.fonts {
fe := d.fonts[i]
data, err := d.readFile(fe.path)
if err != nil {
cb(err)
return
}
if fe.allStyles {
d.addUTF8FontAllStyles(fe.family, data)
} else {
d.internal.AddUTF8FontFromBytes(fe.family, fe.style, data)
}
}
for i := range d.images {
name, path := d.images[i].Key, d.images[i].Value
data, err := d.readFile(path)
if err != nil {
cb(err)
return
}
ext := ""
if idx := LastIndex(path, "."); idx != -1 {
ext = path[idx+1:]
}
opt := fpdf.ImageOptions{ImageType: ext, ReadDpi: true}
d.internal.RegisterImageOptionsReader(name, opt, bytes.NewReader(data))
}
cb(nil)
}
// Draw is a placeholder for consistency, though currently operations draw immediately.
func (d *Document) Draw() *Document {
return d
}
// WritePdf generates the PDF and writes it to the specified path.
func (d *Document) WritePdf(path string) error {
if d.err != nil {
return d.err
}
err := d.internal.OutputFileAndClose(path)
if d.err == nil {
return err
}
return d.err
}
// OutputTo writes the generated PDF into the provided writer.
func (d *Document) OutputTo(w io.Writer) error {
if d.err != nil {
return d.err
}
err := d.internal.Output(w)
if d.err == nil {
return err
}
return d.err
}
// --- Base Components ---
// AddText adds a text paragraph in flow mode.
func (d *Document) AddText(text string) *TextElement {
return &TextElement{doc: d, content: text, align: "L"}
}
// AddHeader1 adds a level 1 header.
func (d *Document) AddHeader1(text string) *Document {
d.setTextColor(d.theme.Accent)
d.internal.SetFont(d.fontFamily, "B", d.theme.Sizes.H1)
d.internal.CellFormat(0, d.theme.Sizes.H1/2, text, "", 1, "L", false, 0, "")
d.setTextColor(d.theme.Body)
d.internal.Ln(d.theme.Spacing.Section)
return d
}
// AddHeader2 adds a level 2 header.
func (d *Document) AddHeader2(text string) *Document {
d.setTextColor(d.theme.Accent)
d.internal.SetFont(d.fontFamily, "B", d.theme.Sizes.H2)
d.internal.CellFormat(0, d.theme.Sizes.H2/2, text, "", 1, "L", false, 0, "")
d.setTextColor(d.theme.Body)
d.internal.Ln(d.theme.Spacing.Section / 2)
return d
}
// AddHeader3 adds a level 3 header.
func (d *Document) AddHeader3(text string) *Document {
d.setTextColor(d.theme.Accent)
d.internal.SetFont(d.fontFamily, "B", d.theme.Sizes.H3)
d.internal.CellFormat(0, d.theme.Sizes.H3/2, text, "", 1, "L", false, 0, "")
d.setTextColor(d.theme.Body)
d.internal.Ln(d.theme.Spacing.Section / 4)
return d
}
// AddSpace adds vertical space.
func (d *Document) AddSpace(units float64) *Document {
d.internal.Ln(units)
return d
}
// SpaceBefore is an alias for AddSpace.
func (d *Document) SpaceBefore(u float64) *Document {
return d.AddSpace(u)
}
// AddPage adds a new page.
func (d *Document) AddPage() *Document {
d.internal.AddPage()
return d
}
// AddSeparator adds a horizontal line.
func (d *Document) AddSeparator() *Document {
x := d.internal.GetX()
y := d.internal.GetY()
w, _ := d.internal.GetPageSize()
lMargin, _, rMargin, _ := d.internal.GetMargins()
width := w - lMargin - rMargin
color := d.theme.Brand
if color == "" {
color = d.theme.Accent
}
d.drawLineH(x, y+2, width, color, 0.2)
d.internal.Ln(5)
return d
}
func (d *Document) drawLineH(x, y, width float64, color Color, thickness float64) {
r, g, b, err := color.parse()
if err != nil {
d.addError(err)
return
}
d.internal.SetDrawColor(r, g, b)
d.internal.SetLineWidth(thickness)
d.internal.Line(x, y, x+width, y)
d.internal.SetDrawColor(0, 0, 0)
d.internal.SetLineWidth(0.2)
}
// AddImage adds an image by name (must be registered/loaded) in flow mode.
func (d *Document) AddImage(name string) *ImageElement {
return &ImageElement{doc: d, name: name, align: "L"}
}
func (d *Document) drawImageAt(name string, x, y, width float64) {
d.internal.Image(name, x, y, width, 0, false, "", 0, "")
}
func (d *Document) setPosition(x, y float64) {
d.internal.SetXY(x, y)
}
func (d *Document) setCursorY(y float64) {
d.internal.SetY(y)
}
func (d *Document) setCursorX(x float64) {
d.internal.SetX(x)
}
func (d *Document) getCursorY() float64 {
return d.internal.GetY()
}
func (d *Document) getCursorX() float64 {
return d.internal.GetX()
}
func (d *Document) drawFilledRect(x, y, w, h float64, color Color) {
r, g, b, err := color.parse()
if err != nil {
d.addError(err)
return
}
d.internal.SetFillColor(r, g, b)
d.internal.Rect(x, y, w, h, "F")
d.internal.SetFillColor(255, 255, 255)
}
func (d *Document) setTextColor(color Color) {
r, g, b, err := color.parse()
if err != nil {
d.addError(err)
return
}
d.internal.SetTextColor(r, g, b)
}
func (d *Document) drawTextAt(x, y float64, text, style string, size float64) {
d.internal.SetXY(x, y)
d.internal.SetFont(d.fontFamily, style, size)
d.internal.Cell(0, size/2.8, text)
}
func (d *Document) cellAt(x, y, w, h float64, text, style string, size float64, align string) {
d.internal.SetXY(x, y)
d.internal.SetFont(d.fontFamily, style, size)
d.internal.CellFormat(w, h, text, "", 0, align, false, 0, "")
}
func (d *Document) measureText(text, style string, size float64) (width, height float64) {
d.internal.SetFont(d.fontFamily, style, size)
return d.internal.GetStringWidth(text), size / 2.8
}
// --- Page Header/Footer ---
type PageHeader struct {
doc *Document
leftText string
rightText string
}
func (d *Document) SetPageHeader() *PageHeader {
ph := &PageHeader{doc: d}
// Register the callback immediately, but it captures the struct so updates will reflect
d.internal.SetHeaderFunc(func() {
d.internal.SetY(10) // Standard header position
d.internal.SetFont(d.fontFamily, "I", 8)
if ph.leftText != "" {
d.internal.Cell(0, 10, ph.leftText)
}
if ph.rightText != "" {
// Align right
// Calculate width? Or use CellFormat with align R?
// Cell(0) goes to right margin.
d.internal.CellFormat(0, 10, ph.rightText, "", 0, "R", false, 0, "")
}
d.internal.Ln(20) // Space after header
})
return ph
}
func (ph *PageHeader) SetLeftText(t string) *PageHeader {
ph.leftText = t
return ph
}
func (ph *PageHeader) SetRightText(t string) *PageHeader {
ph.rightText = t
return ph
}
type PageFooter struct {
doc *Document
centerText string
leftText string
pageTotal bool
}
func (d *Document) SetPageFooter() *PageFooter {
pf := &PageFooter{doc: d}
d.internal.SetFooterFunc(func() {
d.internal.SetY(-15) // Standard footer position
d.internal.SetFont(d.fontFamily, "I", 8)
if pf.leftText != "" {
d.internal.SetTextColor(130, 130, 130)
d.internal.CellFormat(0, 10, pf.leftText, "", 0, "L", false, 0, "")
d.internal.SetTextColor(0, 0, 0)
}
if pf.centerText != "" {
d.internal.CellFormat(0, 10, pf.centerText, "", 0, "C", false, 0, "")
}
if pf.pageTotal {
pageNo := d.internal.PageNo()
pageStr := Sprintf("Página %s/{nb}", Convert(pageNo).String())
d.internal.CellFormat(0, 10, pageStr, "", 0, "R", false, 0, "")
}
d.internal.SetTextColor(0, 0, 0)
})
return pf
}
func (pf *PageFooter) SetCenterText(t string) *PageFooter {
pf.centerText = t
return pf
}
func (pf *PageFooter) WithLeftRight(leftText string) *PageFooter {
pf.leftText = leftText
pf.pageTotal = true
pf.doc.internal.AliasNbPages("")
return pf
}
func (pf *PageFooter) WithPageTotal(align string) *PageFooter {
pf.pageTotal = true
pf.doc.internal.AliasNbPages("")
return pf
}
func (d *Document) SetFont(family string, size float64) *Document {
d.internal.SetFont(family, "", size)
return d
}
// --- Styles ---
type Style struct {
FillColor Color
TextColor Color
Font string // "B", "I", ""
FontSize float64
}
const (
FontBold = "B"
FontItalic = "I"
FontRegular = ""
)