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tomo-old/elements/basic/button.go

185 lines
4.4 KiB
Go

package basic
import "image"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
// Button is a clickable button.
type Button struct {
*core.Core
core core.CoreControl
pressed bool
enabled bool
onClick func ()
text string
drawer artist.TextDrawer
}
// NewButton creates a new button with the specified label text.
func NewButton (text string) (element *Button) {
element = &Button { enabled: true }
element.Core, element.core = core.NewCore(element)
element.drawer.SetFace(theme.FontFaceRegular())
element.core.SetSelectable(true)
element.SetText(text)
return
}
// Handle handles an event.
func (element *Button) Handle (event tomo.Event) {
switch event.(type) {
case tomo.EventResize:
resizeEvent := event.(tomo.EventResize)
element.core.AllocateCanvas (
resizeEvent.Width,
resizeEvent.Height)
element.draw()
case tomo.EventMouseDown:
if !element.enabled { break }
mouseDownEvent := event.(tomo.EventMouseDown)
element.Select()
if mouseDownEvent.Button != tomo.ButtonLeft { break }
element.pressed = true
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
case tomo.EventKeyDown:
keyDownEvent := event.(tomo.EventKeyDown)
if keyDownEvent.Key == tomo.KeyEnter {
element.pressed = true
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
}
case tomo.EventMouseUp:
if !element.enabled { break }
mouseUpEvent := event.(tomo.EventMouseUp)
if mouseUpEvent.Button != tomo.ButtonLeft { break }
element.pressed = false
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
within := image.Point { mouseUpEvent.X, mouseUpEvent.Y }.
In(element.Bounds())
if within && element.onClick != nil {
element.onClick()
}
case tomo.EventKeyUp:
keyDownEvent := event.(tomo.EventKeyUp)
if keyDownEvent.Key == tomo.KeyEnter && element.pressed {
element.pressed = false
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
if element.onClick != nil {
element.onClick()
}
}
case tomo.EventSelect:
element.core.SetSelected(true)
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
case tomo.EventDeselect:
element.core.SetSelected(false)
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
}
return
}
// OnClick sets the function to be called when the button is clicked.
func (element *Button) OnClick (callback func ()) {
element.onClick = callback
}
// Select requests that this button's parent container send it a selection
// event.
func (element *Button) Select () {
element.core.Select()
}
// SetEnabled sets whether this button can be clicked or not.
func (element *Button) SetEnabled (enabled bool) {
if element.enabled == enabled { return }
element.enabled = enabled
element.core.SetSelectable(enabled)
if element.core.HasImage () {
element.draw()
element.core.PushAll()
}
}
// SetText sets the button's label text.
func (element *Button) SetText (text string) {
if element.text == text { return }
element.text = text
element.drawer.SetText(text)
textBounds := element.drawer.LayoutBounds()
element.core.SetMinimumSize (
theme.Padding() * 2 + textBounds.Dx(),
theme.Padding() * 2 + textBounds.Dy())
if element.core.HasImage () {
element.draw()
element.core.PushAll()
}
}
func (element *Button) draw () {
bounds := element.core.Bounds()
artist.FillRectangle (
element.core,
theme.ButtonPattern (
element.enabled,
element.Selected(),
element.pressed),
bounds)
innerBounds := bounds
innerBounds.Min.X += theme.Padding()
innerBounds.Min.Y += theme.Padding()
innerBounds.Max.X -= theme.Padding()
innerBounds.Max.Y -= theme.Padding()
textBounds := element.drawer.LayoutBounds()
offset := image.Point {
X: theme.Padding() + (innerBounds.Dx() - textBounds.Dx()) / 2,
Y: theme.Padding() + (innerBounds.Dy() - textBounds.Dy()) / 2,
}
// account for the fact that the bounding rectangle will be shifted over
// due to the bounds origin being at the baseline of the first line
offset.Y -= textBounds.Min.Y
offset.X -= textBounds.Min.X
if element.pressed {
offset = offset.Add(theme.SinkOffsetVector())
}
foreground := theme.ForegroundPattern(element.enabled)
element.drawer.Draw(element.core, foreground, offset)
}