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tomo-old/elements/basic/textbox.go

407 lines
10 KiB
Go

package basicElements
import "image"
import "git.tebibyte.media/sashakoshka/tomo/input"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/config"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/textmanip"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
// TextBox is a single-line text input.
type TextBox struct {
*core.Core
*core.FocusableCore
core core.CoreControl
focusableControl core.FocusableCoreControl
dragging bool
dot textmanip.Dot
scroll int
placeholder string
text []rune
placeholderDrawer artist.TextDrawer
valueDrawer artist.TextDrawer
config config.Wrapped
theme theme.Wrapped
onKeyDown func (key input.Key, modifiers input.Modifiers) (handled bool)
onChange func ()
onScrollBoundsChange func ()
}
// NewTextBox creates a new text box with the specified placeholder text, and
// a value. When the value is empty, the placeholder will be displayed in gray
// text.
func NewTextBox (placeholder, value string) (element *TextBox) {
element = &TextBox { }
element.theme.Case = theme.C("basic", "textBox")
element.Core, element.core = core.NewCore(element.handleResize)
element.FocusableCore,
element.focusableControl = core.NewFocusableCore (func () {
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
})
element.placeholder = placeholder
element.placeholderDrawer.SetText([]rune(placeholder))
element.updateMinimumSize()
element.SetValue(value)
return
}
func (element *TextBox) handleResize () {
element.scrollToCursor()
element.draw()
if element.onScrollBoundsChange != nil {
element.onScrollBoundsChange()
}
}
func (element *TextBox) HandleMouseDown (x, y int, button input.Button) {
if !element.Enabled() { return }
if !element.Focused() { element.Focus() }
if button == input.ButtonLeft {
point := image.Pt(x, y)
offset := element.Bounds().Min.Add (image.Pt (
element.config.Padding() - element.scroll,
element.config.Padding()))
runeIndex := element.valueDrawer.AtPosition(point.Sub(offset))
element.dragging = true
if runeIndex > -1 {
element.dot = textmanip.EmptyDot(runeIndex)
element.redo()
}
}
}
func (element *TextBox) HandleMouseMove (x, y int) {
if !element.Enabled() { return }
if !element.Focused() { element.Focus() }
if element.dragging {
point := image.Pt(x, y)
offset := element.Bounds().Min.Add (image.Pt (
element.config.Padding() - element.scroll,
element.config.Padding()))
runeIndex := element.valueDrawer.AtPosition(point.Sub(offset))
if runeIndex > -1 {
element.dot.End = runeIndex
element.redo()
}
}
}
func (element *TextBox) HandleMouseUp (x, y int, button input.Button) {
if button == input.ButtonLeft {
element.dragging = false
}
}
func (element *TextBox) HandleMouseScroll (x, y int, deltaX, deltaY float64) { }
func (element *TextBox) HandleKeyDown(key input.Key, modifiers input.Modifiers) {
if element.onKeyDown != nil && element.onKeyDown(key, modifiers) {
return
}
// TODO: text selection with shift
scrollMemory := element.scroll
altered := true
textChanged := false
switch {
case key == input.KeyBackspace:
if len(element.text) < 1 { break }
element.text, element.dot = textmanip.Backspace (
element.text,
element.dot,
modifiers.Control)
textChanged = true
case key == input.KeyDelete:
if len(element.text) < 1 { break }
element.text, element.dot = textmanip.Delete (
element.text,
element.dot,
modifiers.Control)
textChanged = true
case key == input.KeyLeft:
if modifiers.Shift {
element.dot = textmanip.SelectLeft (
element.text,
element.dot,
modifiers.Control)
} else {
element.dot = textmanip.MoveLeft (
element.text,
element.dot,
modifiers.Control)
}
case key == input.KeyRight:
if modifiers.Shift {
element.dot = textmanip.SelectRight (
element.text,
element.dot,
modifiers.Control)
} else {
element.dot = textmanip.MoveRight (
element.text,
element.dot,
modifiers.Control)
}
case key.Printable():
element.text, element.dot = textmanip.Type (
element.text,
element.dot,
rune(key))
textChanged = true
default:
altered = false
}
if textChanged {
element.runOnChange()
element.valueDrawer.SetText(element.text)
}
if altered {
element.scrollToCursor()
}
if (textChanged || scrollMemory != element.scroll) &&
element.onScrollBoundsChange != nil {
element.onScrollBoundsChange()
}
if altered {
element.redo()
}
}
func (element *TextBox) HandleKeyUp(key input.Key, modifiers input.Modifiers) { }
func (element *TextBox) SetPlaceholder (placeholder string) {
if element.placeholder == placeholder { return }
element.placeholder = placeholder
element.placeholderDrawer.SetText([]rune(placeholder))
element.updateMinimumSize()
element.redo()
}
func (element *TextBox) SetValue (text string) {
// if element.text == text { return }
element.text = []rune(text)
element.runOnChange()
element.valueDrawer.SetText(element.text)
if element.dot.End > element.valueDrawer.Length() {
element.dot = textmanip.EmptyDot(element.valueDrawer.Length())
}
element.scrollToCursor()
element.redo()
}
func (element *TextBox) Value () (value string) {
return string(element.text)
}
func (element *TextBox) Filled () (filled bool) {
return len(element.text) > 0
}
func (element *TextBox) OnKeyDown (
callback func (key input.Key, modifiers input.Modifiers) (handled bool),
) {
element.onKeyDown = callback
}
func (element *TextBox) OnChange (callback func ()) {
element.onChange = callback
}
// ScrollContentBounds returns the full content size of the element.
func (element *TextBox) ScrollContentBounds () (bounds image.Rectangle) {
bounds = element.valueDrawer.LayoutBounds()
return bounds.Sub(bounds.Min)
}
// ScrollViewportBounds returns the size and position of the element's viewport
// relative to ScrollBounds.
func (element *TextBox) ScrollViewportBounds () (bounds image.Rectangle) {
return image.Rect (
element.scroll,
0,
element.scroll + element.scrollViewportWidth(),
0)
}
func (element *TextBox) scrollViewportWidth () (width int) {
return element.Bounds().Inset(element.config.Padding()).Dx()
}
// ScrollTo scrolls the viewport to the specified point relative to
// ScrollBounds.
func (element *TextBox) ScrollTo (position image.Point) {
// constrain to minimum
element.scroll = position.X
if element.scroll < 0 { element.scroll = 0 }
// constrain to maximum
contentBounds := element.ScrollContentBounds()
maxPosition := contentBounds.Max.X - element.scrollViewportWidth()
if element.scroll > maxPosition { element.scroll = maxPosition }
element.redo()
if element.onScrollBoundsChange != nil {
element.onScrollBoundsChange()
}
}
// ScrollAxes returns the supported axes for scrolling.
func (element *TextBox) ScrollAxes () (horizontal, vertical bool) {
return true, false
}
func (element *TextBox) OnScrollBoundsChange (callback func ()) {
element.onScrollBoundsChange = callback
}
func (element *TextBox) runOnChange () {
if element.onChange != nil {
element.onChange()
}
}
func (element *TextBox) scrollToCursor () {
if !element.core.HasImage() { return }
bounds := element.Bounds().Inset(element.config.Padding())
bounds = bounds.Sub(bounds.Min)
bounds.Max.X -= element.valueDrawer.Em().Round()
cursorPosition := element.valueDrawer.PositionOf(element.dot.End)
cursorPosition.X -= element.scroll
maxX := bounds.Max.X
minX := maxX
if cursorPosition.X > maxX {
element.scroll += cursorPosition.X - maxX
} else if cursorPosition.X < minX {
element.scroll -= minX - cursorPosition.X
if element.scroll < 0 { element.scroll = 0 }
}
}
// SetTheme sets the element's theme.
func (element *TextBox) SetTheme (new theme.Theme) {
if new == element.theme.Theme { return }
element.theme.Theme = new
face := element.theme.FontFace (
theme.FontStyleRegular,
theme.FontSizeNormal)
element.placeholderDrawer.SetFace(face)
element.valueDrawer.SetFace(face)
element.updateMinimumSize()
element.redo()
}
// SetConfig sets the element's configuration.
func (element *TextBox) SetConfig (new config.Config) {
if new == element.config.Config { return }
element.config.Config = new
element.updateMinimumSize()
element.redo()
}
func (element *TextBox) updateMinimumSize () {
textBounds := element.placeholderDrawer.LayoutBounds()
element.core.SetMinimumSize (
textBounds.Dx() +
element.config.Padding() * 2,
element.placeholderDrawer.LineHeight().Round() +
element.config.Padding() * 2)
}
func (element *TextBox) redo () {
if element.core.HasImage () {
element.draw()
element.core.DamageAll()
}
}
func (element *TextBox) draw () {
bounds := element.Bounds()
// FIXME: take index into account
state := theme.PatternState {
Disabled: !element.Enabled(),
Focused: element.Focused(),
}
pattern := element.theme.Pattern(theme.PatternSunken, state)
artist.FillRectangle(element.core, pattern, bounds)
offset := bounds.Min.Add (image.Point {
X: element.config.Padding() - element.scroll,
Y: element.config.Padding(),
})
if element.Focused() && !element.dot.Empty() {
// draw selection bounds
accent := element.theme.Pattern (
theme.PatternAccent, state)
canon := element.dot.Canon()
start := element.valueDrawer.PositionOf(canon.Start).Add(offset)
end := element.valueDrawer.PositionOf(canon.End).Add(offset)
end.Y += element.valueDrawer.LineHeight().Round()
artist.FillRectangle (
element.core,
accent,
image.Rectangle { start, end })
}
if len(element.text) == 0 {
// draw placeholder
textBounds := element.placeholderDrawer.LayoutBounds()
foreground := element.theme.Pattern (
theme.PatternForeground,
theme.PatternState { Disabled: true })
element.placeholderDrawer.Draw (
element.core,
foreground,
offset.Sub(textBounds.Min))
} else {
// draw input value
textBounds := element.valueDrawer.LayoutBounds()
foreground := element.theme.Pattern (
theme.PatternForeground, state)
element.valueDrawer.Draw (
element.core,
foreground,
offset.Sub(textBounds.Min))
}
if element.Focused() && element.dot.Empty() {
// draw cursor
foreground := element.theme.Pattern (
theme.PatternForeground, state)
cursorPosition := element.valueDrawer.PositionOf (
element.dot.End)
artist.Line (
element.core,
foreground, 1,
cursorPosition.Add(offset),
image.Pt (
cursorPosition.X,
cursorPosition.Y + element.valueDrawer.
LineHeight().Round()).Add(offset))
}
}