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slider.go
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slider.go
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// Copyright 2016 The G3N Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gui
import (
"github.com/g3n/engine/window"
)
/***************************************
Slider
+--------------------------------+
| +--------------------------+ |
| | +----------+ | |
| | | | | |
| | | | | |
| | +----------+ | |
| +--------------------------+ |
+--------------------------------+
**/
// Slider is the GUI element for sliders and progress bars
type Slider struct {
Panel // Embedded panel
slider Panel // embedded slider panel
label *Label // optional label
horiz bool // orientation
styles *SliderStyles // pointer to styles
pos float32 // current slider position
posLast float32 // last position of the mouse cursor when dragging
pressed bool // mouse button is pressed and dragging
cursorOver bool // mouse is over slider
scaleFactor float32 // scale factor (default = 1.0)
}
// SliderStyle contains the styling of a Slider
type SliderStyle BasicStyle
// SliderStyles contains a SliderStyle for each valid GUI state
type SliderStyles struct {
Normal SliderStyle
Over SliderStyle
Focus SliderStyle
Disabled SliderStyle
}
// NewHSlider creates and returns a pointer to a new horizontal slider
// with the specified initial dimensions.
func NewHSlider(width, height float32) *Slider {
return newSlider(true, width, height)
}
// NewVSlider creates and returns a pointer to a new vertical slider
// with the specified initial dimensions.
func NewVSlider(width, height float32) *Slider {
return newSlider(false, width, height)
}
// NewSlider creates and returns a pointer to a new slider with the
// specified initial dimensions.
func newSlider(horiz bool, width, height float32) *Slider {
s := new(Slider)
s.horiz = horiz
s.styles = &StyleDefault().Slider
s.scaleFactor = 1.0
// Initialize main panel
s.Panel.Initialize(width, height)
s.Panel.Subscribe(OnMouseDown, s.onMouse)
s.Panel.Subscribe(OnMouseUp, s.onMouse)
s.Panel.Subscribe(OnCursor, s.onCursor)
s.Panel.Subscribe(OnCursorEnter, s.onCursor)
s.Panel.Subscribe(OnCursorLeave, s.onCursor)
s.Panel.Subscribe(OnScroll, s.onScroll)
s.Panel.Subscribe(OnKeyDown, s.onKey)
s.Panel.Subscribe(OnKeyRepeat, s.onKey)
s.Panel.Subscribe(OnResize, s.onResize)
s.Panel.Subscribe(OnEnable, func(evname string, ev interface{}) { s.update() })
// Initialize slider panel
s.slider.Initialize(0, 0)
s.Panel.Add(&s.slider)
s.recalc()
s.update()
return s
}
// SetStyles set the slider styles overriding the default style
func (s *Slider) SetStyles(ss *SliderStyles) *Slider {
s.styles = ss
s.update()
return s
}
// SetText sets the text of the slider optional label
func (s *Slider) SetText(text string) *Slider {
if s.label == nil {
s.label = NewLabel(text)
s.Panel.Add(s.label)
} else {
s.label.SetText(text)
}
s.update()
s.recalc()
return s
}
// SetValue sets the value of the slider considering the current scale factor
// and updates its visual appearance.
func (s *Slider) SetValue(value float32) *Slider {
pos := value / s.scaleFactor
s.setPos(pos)
return s
}
// Value returns the current value of the slider considering the current scale factor
func (s *Slider) Value() float32 {
return s.pos * s.scaleFactor
}
// SetScaleFactor set the slider scale factor (default = 1.0)
func (s *Slider) SetScaleFactor(factor float32) *Slider {
s.scaleFactor = factor
return s
}
// ScaleFactor returns the slider current scale factor (default = 1.0)
func (s *Slider) ScaleFactor() float32 {
return s.scaleFactor
}
// setPos sets the slider position from 0.0 to 1.0
// and updates its visual appearance.
func (s *Slider) setPos(pos float32) {
const eps = 0.01
if pos < 0 {
pos = 0
} else if pos > 1.0 {
pos = 1
}
if pos > (s.pos+eps) && pos < (s.pos+eps) {
return
}
s.pos = pos
s.recalc()
s.Dispatch(OnChange, nil)
}
// onMouse process subscribed mouse events over the outer panel
func (s *Slider) onMouse(evname string, ev interface{}) {
mev := ev.(*window.MouseEvent)
switch evname {
case OnMouseDown:
s.pressed = true
if s.horiz {
s.posLast = mev.Xpos
} else {
s.posLast = mev.Ypos
}
s.root.SetMouseFocus(s)
s.root.SetKeyFocus(s)
case OnMouseUp:
s.pressed = false
if !s.cursorOver {
s.root.SetCursorNormal()
}
s.root.SetMouseFocus(nil)
default:
return
}
s.root.StopPropagation(Stop3D)
}
// onCursor process subscribed cursor events
func (s *Slider) onCursor(evname string, ev interface{}) {
if evname == OnCursorEnter {
s.root.SetScrollFocus(s)
if s.horiz {
s.root.SetCursorHResize()
} else {
s.root.SetCursorVResize()
}
s.cursorOver = true
s.update()
} else if evname == OnCursorLeave {
s.root.SetScrollFocus(nil)
s.root.SetCursorNormal()
s.cursorOver = false
s.update()
} else if evname == OnCursor {
if !s.pressed {
return
}
cev := ev.(*window.CursorEvent)
var pos float32
if s.horiz {
delta := cev.Xpos - s.posLast
s.posLast = cev.Xpos
newpos := s.slider.Width() + delta
pos = newpos / s.Panel.ContentWidth()
} else {
delta := cev.Ypos - s.posLast
s.posLast = cev.Ypos
newpos := s.slider.Height() - delta
pos = newpos / s.Panel.ContentHeight()
}
s.setPos(pos)
}
s.root.StopPropagation(Stop3D)
}
// onScroll process subscribed scroll events
func (s *Slider) onScroll(evname string, ev interface{}) {
sev := ev.(*window.ScrollEvent)
v := s.pos
v += sev.Yoffset * 0.01
s.setPos(v)
s.root.StopPropagation(Stop3D)
}
// onKey process subscribed key events
func (s *Slider) onKey(evname string, ev interface{}) {
kev := ev.(*window.KeyEvent)
delta := float32(0.01)
// Horizontal slider
if s.horiz {
switch kev.Keycode {
case window.KeyLeft:
s.setPos(s.pos - delta)
case window.KeyRight:
s.setPos(s.pos + delta)
default:
return
}
// Vertical slider
} else {
switch kev.Keycode {
case window.KeyDown:
s.setPos(s.pos - delta)
case window.KeyUp:
s.setPos(s.pos + delta)
default:
return
}
}
s.root.StopPropagation(Stop3D)
}
// onResize process subscribed resize events
func (s *Slider) onResize(evname string, ev interface{}) {
s.recalc()
}
// update updates the slider visual state
func (s *Slider) update() {
if !s.Enabled() {
s.applyStyle(&s.styles.Disabled)
return
}
if s.cursorOver {
s.applyStyle(&s.styles.Over)
return
}
s.applyStyle(&s.styles.Normal)
}
// applyStyle applies the specified slider style
func (s *Slider) applyStyle(ss *SliderStyle) {
s.Panel.ApplyStyle(&ss.PanelStyle)
s.slider.SetColor4(&ss.FgColor)
}
// recalc recalculates the dimensions and positions of the internal panels.
func (s *Slider) recalc() {
if s.horiz {
if s.label != nil {
lx := (s.Panel.ContentWidth() - s.label.Width()) / 2
if s.Panel.ContentHeight() < s.label.Height() {
s.Panel.SetContentHeight(s.label.Height())
}
ly := (s.Panel.ContentHeight() - s.label.Height()) / 2
s.label.SetPosition(lx, ly)
}
width := s.Panel.ContentWidth() * s.pos
s.slider.SetSize(width, s.Panel.ContentHeight())
} else {
if s.label != nil {
if s.Panel.ContentWidth() < s.label.Width() {
s.Panel.SetContentWidth(s.label.Width())
}
lx := (s.Panel.ContentWidth() - s.label.Width()) / 2
ly := (s.Panel.ContentHeight() - s.label.Height()) / 2
s.label.SetPosition(lx, ly)
}
height := s.Panel.ContentHeight() * s.pos
s.slider.SetPositionY(s.Panel.ContentHeight() - height)
s.slider.SetSize(s.Panel.ContentWidth(), height)
}
}