zntg/ui/fonts.go

package ui

import (
	"fmt"
	"image/color"

	"opslag.de/schobers/geom"
)

type Fonts struct {
	render Renderer
	fonts  map[string]Font
}

func NewFonts(render Renderer) *Fonts {
	return &Fonts{render, map[string]Font{}}
}

func (f *Fonts) AddFont(name string, font Font) {
	curr := f.fonts[name]
	if curr != nil {
		curr.Destroy()
	}
	f.fonts[name] = font
}

func (f *Fonts) createFont(name string, create func() (Font, error)) (Font, error) {
	font, err := create()
	if err != nil {
		return nil, err
	}
	f.AddFont(name, font)
	return font, nil
}

func (f *Fonts) CreateFontPath(name, path string, size int) (Font, error) {
	return f.createFont(name, func() (Font, error) {
		return f.render.CreateFontPath(path, size)
	})
}

func (f *Fonts) Destroy() {
	for _, font := range f.fonts {
		font.Destroy()
	}
	f.fonts = nil
}

func (f *Fonts) Font(name string) Font {
	font, ok := f.fonts[name]
	if ok {
		return font
	}
	return nil
}

func (f *Fonts) Text(fontName string, p geom.PointF32, color color.Color, text string) {
	font := f.Font(fontName)
	if font == nil {
		return
	}
	f.render.Text(font, p, color, text)
}

func (f *Fonts) TextAlign(fontName string, p geom.PointF32, color color.Color, text string, align HorizontalAlignment) {
	font := f.Font(fontName)
	if font == nil {
		return
	}
	f.render.TextAlign(font, p, color, text, align)
}

func (f *Fonts) TextTexture(fontName string, color color.Color, text string) (Texture, error) {
	font := f.Font(fontName)
	if font == nil {
		return nil, fmt.Errorf("no font with name '%s'", fontName)
	}
	return f.render.TextTexture(font, color, text)
}