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package ui
import (
"encoding/json"
"fmt"
rl "github.com/gen2brain/raylib-go/raylib"
)
const LabelTypeName string = "label"
var defaultLabelPadding float32 = 0.1
var defaultLabelRoundness float32 = 0.2
// If the text formation formula is applied without it the text is
// overlowing on the right due to rounding errors
const overflowMultiplyer float32 = 1.15
var defaultLabelStyle = &Style{
BacgroundColor: &rl.LightGray,
FontColor: &rl.DarkGray,
Padding: &defaultLabelPadding,
Roundness: &defaultLabelRoundness,
}
type TextAlignment uint8
const (
Center TextAlignment = iota
Start
)
// A UI element containing a text field
type Label struct {
Weight float32
Text string
Alignment TextAlignment
Style Style `json:"-"`
BackgroundElement UIElement
}
func (base *Label) Init(menu *Menu) {
base.Style.FillMissing(defaultLabelStyle)
if base.Weight == 0 {
base.Weight = 1
}
if base.BackgroundElement != nil {
base.BackgroundElement.Init(menu)
}
}
func (base *Label) Destroy() {
}
func (base *Label) GetOccupationWeight() float32 {
return base.Weight
}
func (base *Label) Draw(position *rl.Rectangle) {
// rl.TraceLog(rl.LogInfo, "Drawn at %v/%v/%v/%v", position.X, position.Y, position.Width, position.Height)
drawStackedElementBackground(base, position)
var textHeight = base.getTextHeight(position)
var textY = int32(position.Y)
if base.Alignment == Center {
textY += (int32(position.Height) - textHeight) / 2
}
rl.DrawText(base.Text,
int32(position.X + (*base.Style.Padding * position.Width)),
textY,
textHeight,
*base.Style.FontColor)
}
func (base *Label) GetStyle() *Style {
return &base.Style
}
func (base *Label) GetBackgroundElement() UIElement {
return base.BackgroundElement
}
// Returns the size of the text that will not overflow in the side
func (base *Label) getTextHeight(position *rl.Rectangle) int32 {
var width = position.Width - 2 * *base.Style.Padding
var outp = position.Height - 2 * *base.Style.Padding
var maxWidthSize = rl.MeasureText(base.Text, int32(outp))
if maxWidthSize > int32(width) {
outp /= (float32(maxWidthSize) / width) * overflowMultiplyer
}
return int32(outp)
}
func (base Label) String() string {
var outp, jsonErr = json.Marshal(base)
if jsonErr != nil {
return fmt.Sprintf("Failed to parse label: %s", jsonErr.Error())
}
return string(outp)
}
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