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label.go
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label.go
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package glmenu
import (
"github.com/4ydx/gltext/v4.1"
"github.com/go-gl/mathgl/mgl32"
)
type LabelAction int
const (
NOOP LabelAction = iota
GOTO_MENU
EXIT_MENU
EXIT_GAME
)
type LabelConfig struct {
Padding Padding
Action LabelAction
Goto string
}
type LabelInteraction func(
xPos, yPos float64,
button MouseClick,
isInBoundingBox bool,
)
type Label struct {
Config LabelConfig
Menu *Menu
Text *v41.Text
IsHover bool
IsClick bool
// public methods are expected to be defined by the user and run before the private method are called
// if a public method is undefined, it is skipped. Currently I have only defined onRelease as private.
OnClick LabelInteraction
onRelease LabelInteraction // set internally. handles linking different menus together, closing menus, closing game etc.
StopOnRelease bool // set to true in order to prevent onRelease being called
OnRelease LabelInteraction
OnHover LabelInteraction
OnNotHover func()
}
func (label *Label) Reset() {
label.Text.SetScale(label.Text.ScaleMin)
}
func (label *Label) GetPosition() mgl32.Vec2 {
return label.Text.Position
}
func (label *Label) GetPadding() Padding {
return label.Config.Padding
}
func (label *Label) SetString(str string, argv ...interface{}) {
if len(argv) == 0 {
label.Text.SetString(str)
} else {
label.Text.SetString(str, argv)
}
}
func (label *Label) OrthoToScreenCoord() (X1 Point, X2 Point) {
if label.Menu != nil && label.Text != nil {
x1, x2 := label.Text.GetBoundingBox()
X1.X = x1.X + label.Menu.WindowWidth/2
X1.Y = x1.Y + label.Menu.WindowHeight/2
X2.X = x2.X + label.Menu.WindowWidth/2
X2.Y = x2.Y + label.Menu.WindowHeight/2
} else {
if label.Menu == nil {
MenuDebug("Uninitialized Menu Object")
}
if label.Text == nil {
MenuDebug("Uninitialized Text Object")
}
}
return
}
// IsClicked uses a bounding box to determine clicks
func (label *Label) IsClicked(xPos, yPos float64, button MouseClick) {
// menu rendering (and text) is positioned in orthographic projection coordinates
// but click positions are based on window coordinates
// we have to transform them
X1, X2 := label.OrthoToScreenCoord()
inBox := float32(xPos) > X1.X && float32(xPos) < X2.X && float32(yPos) > X1.Y && float32(yPos) < X2.Y
if inBox {
label.IsClick = true
if label.OnClick != nil {
label.OnClick(xPos, yPos, button, inBox)
}
}
}
// InsidePoint returns a point nearby the center of the label
// Used to locate a screen position where clicking can be simulated
func (label *Label) InsidePoint() (P Point) {
X1, X2 := label.OrthoToScreenCoord()
P.X = (X2.X-X1.X)/2 + X1.X
P.Y = (X2.Y-X1.Y)/2 + X1.Y
return
}
// IsReleased is checked for all labels in a menu when mouseup occurs
func (label *Label) IsReleased(xPos, yPos float64, button MouseClick) {
// anything flagged as clicked now needs to decide whether to execute its logic based on inBox
X1, X2 := label.OrthoToScreenCoord()
inBox := float32(xPos) > X1.X && float32(xPos) < X2.X && float32(yPos) > X1.Y && float32(yPos) < X2.Y
if label.IsClick {
if label.IsHover {
label.Text.SetColor(label.Menu.Defaults.TextHover)
} else {
label.Text.SetColor(label.Menu.Defaults.TextColor)
}
if label.OnRelease != nil {
label.OnRelease(xPos, yPos, button, inBox)
}
if !label.StopOnRelease {
label.onRelease(xPos, yPos, button, inBox)
}
label.StopOnRelease = false
}
label.IsClick = false
}
// IsHovered uses a bounding box
func (label *Label) IsHovered(xPos, yPos float64) {
X1, X2 := label.OrthoToScreenCoord()
inBox := float32(xPos) > X1.X && float32(xPos) < X2.X && float32(yPos) > X1.Y && float32(yPos) < X2.Y
label.IsHover = inBox
if inBox {
label.OnHover(xPos, yPos, MouseUnclicked, inBox)
}
}
func (label *Label) Draw() {
label.Text.Draw()
}
func (label *Label) SetPosition(v mgl32.Vec2) {
label.Text.SetPosition(v)
}
func (label *Label) Height() float32 {
return label.Text.Height()
}
func (label *Label) Width() float32 {
return label.Text.Width()
}
func (label *Label) NavigateTo() {
point := label.InsidePoint()
if label.OnHover != nil {
label.IsHovered(float64(point.X), float64(point.Y))
}
}
// NavigateAway if we end up needing to navigate away from this item then let the caller know
// because it might need that information. return value of 'true'
func (label *Label) NavigateAway() bool {
if label.IsHover {
label.IsHover = false
return true
}
return false
}
func (label *Label) Follow() bool {
if label.IsHover {
point := label.InsidePoint()
label.IsClicked(float64(point.X), float64(point.Y), MouseLeft)
label.IsReleased(float64(point.X), float64(point.Y), MouseLeft)
return true
}
return false
}
func (label *Label) IsNoop() bool {
return label.Config.Action == NOOP
}
func (label *Label) Type() FormatableType {
return FormatableLabel
}