334 lines
8.6 KiB
Go
334 lines
8.6 KiB
Go
package basic
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo"
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import "git.tebibyte.media/sashakoshka/tomo/theme"
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import "git.tebibyte.media/sashakoshka/tomo/artist"
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import "git.tebibyte.media/sashakoshka/tomo/textmanip"
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import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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var textBoxCase = theme.C("basic", "textBox")
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// TextBox is a single-line text input.
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type TextBox struct {
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*core.Core
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*core.FocusableCore
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core core.CoreControl
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focusableControl core.FocusableCoreControl
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cursor int
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scroll int
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placeholder string
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text []rune
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placeholderDrawer artist.TextDrawer
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valueDrawer artist.TextDrawer
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onKeyDown func (key tomo.Key, modifiers tomo.Modifiers) (handled bool)
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onChange func ()
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onScrollBoundsChange func ()
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}
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// NewTextBox creates a new text box with the specified placeholder text, and
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// a value. When the value is empty, the placeholder will be displayed in gray
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// text.
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func NewTextBox (placeholder, value string) (element *TextBox) {
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element = &TextBox { }
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element.Core, element.core = core.NewCore(element.handleResize)
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element.FocusableCore,
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element.focusableControl = core.NewFocusableCore (func () {
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if element.core.HasImage () {
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element.draw()
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element.core.DamageAll()
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}
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})
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element.placeholderDrawer.SetFace(theme.FontFaceRegular())
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element.valueDrawer.SetFace(theme.FontFaceRegular())
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element.placeholder = placeholder
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element.placeholderDrawer.SetText([]rune(placeholder))
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element.updateMinimumSize()
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element.SetValue(value)
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return
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}
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func (element *TextBox) handleResize () {
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element.scrollToCursor()
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element.draw()
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if element.onScrollBoundsChange != nil {
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element.onScrollBoundsChange()
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}
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}
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func (element *TextBox) HandleMouseDown (x, y int, button tomo.Button) {
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if !element.Enabled() { return }
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if !element.Focused() { element.Focus() }
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}
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func (element *TextBox) HandleMouseUp (x, y int, button tomo.Button) { }
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func (element *TextBox) HandleMouseMove (x, y int) { }
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func (element *TextBox) HandleMouseScroll (x, y int, deltaX, deltaY float64) { }
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func (element *TextBox) HandleKeyDown(key tomo.Key, modifiers tomo.Modifiers) {
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if element.onKeyDown != nil && element.onKeyDown(key, modifiers) {
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return
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}
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scrollMemory := element.scroll
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altered := true
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textChanged := false
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switch {
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case key == tomo.KeyBackspace:
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if len(element.text) < 1 { break }
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element.text, element.cursor = textmanip.Backspace (
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element.text,
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element.cursor,
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modifiers.Control)
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textChanged = true
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case key == tomo.KeyDelete:
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if len(element.text) < 1 { break }
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element.text, element.cursor = textmanip.Delete (
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element.text,
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element.cursor,
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modifiers.Control)
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textChanged = true
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case key == tomo.KeyLeft:
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element.cursor = textmanip.MoveLeft (
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element.text,
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element.cursor,
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modifiers.Control)
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case key == tomo.KeyRight:
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element.cursor = textmanip.MoveRight (
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element.text,
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element.cursor,
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modifiers.Control)
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case key.Printable():
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element.text, element.cursor = textmanip.Type (
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element.text,
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element.cursor,
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rune(key))
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textChanged = true
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default:
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altered = false
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}
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if textChanged {
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element.runOnChange()
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element.valueDrawer.SetText(element.text)
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}
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if altered {
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element.scrollToCursor()
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}
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if (textChanged || scrollMemory != element.scroll) &&
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element.onScrollBoundsChange != nil {
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element.onScrollBoundsChange()
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}
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if altered && element.core.HasImage () {
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element.draw()
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element.core.DamageAll()
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}
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}
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func (element *TextBox) HandleKeyUp(key tomo.Key, modifiers tomo.Modifiers) { }
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func (element *TextBox) SetPlaceholder (placeholder string) {
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if element.placeholder == placeholder { return }
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element.placeholder = placeholder
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element.placeholderDrawer.SetText([]rune(placeholder))
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element.updateMinimumSize()
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if element.core.HasImage () {
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element.draw()
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element.core.DamageAll()
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}
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}
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func (element *TextBox) SetValue (text string) {
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// if element.text == text { return }
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element.text = []rune(text)
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element.runOnChange()
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element.valueDrawer.SetText(element.text)
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if element.cursor > element.valueDrawer.Length() {
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element.cursor = element.valueDrawer.Length()
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}
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element.scrollToCursor()
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if element.core.HasImage () {
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element.draw()
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element.core.DamageAll()
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}
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}
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func (element *TextBox) Value () (value string) {
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return string(element.text)
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}
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func (element *TextBox) Filled () (filled bool) {
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return len(element.text) > 0
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}
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func (element *TextBox) OnKeyDown (
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callback func (key tomo.Key, modifiers tomo.Modifiers) (handled bool),
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) {
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element.onKeyDown = callback
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}
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func (element *TextBox) OnChange (callback func ()) {
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element.onChange = callback
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}
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// ScrollContentBounds returns the full content size of the element.
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func (element *TextBox) ScrollContentBounds () (bounds image.Rectangle) {
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bounds = element.valueDrawer.LayoutBounds()
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return bounds.Sub(bounds.Min)
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}
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// ScrollViewportBounds returns the size and position of the element's viewport
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// relative to ScrollBounds.
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func (element *TextBox) ScrollViewportBounds () (bounds image.Rectangle) {
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return image.Rect (
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element.scroll,
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0,
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element.scroll + element.scrollViewportWidth(),
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0)
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}
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func (element *TextBox) scrollViewportWidth () (width int) {
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return element.Bounds().Inset(theme.Padding()).Dx()
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}
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// ScrollTo scrolls the viewport to the specified point relative to
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// ScrollBounds.
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func (element *TextBox) ScrollTo (position image.Point) {
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// constrain to minimum
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element.scroll = position.X
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if element.scroll < 0 { element.scroll = 0 }
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// constrain to maximum
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contentBounds := element.ScrollContentBounds()
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maxPosition := contentBounds.Max.X - element.scrollViewportWidth()
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if element.scroll > maxPosition { element.scroll = maxPosition }
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if element.core.HasImage () {
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element.draw()
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element.core.DamageAll()
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}
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if element.onScrollBoundsChange != nil {
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element.onScrollBoundsChange()
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}
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}
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// ScrollAxes returns the supported axes for scrolling.
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func (element *TextBox) ScrollAxes () (horizontal, vertical bool) {
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return true, false
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}
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func (element *TextBox) OnScrollBoundsChange (callback func ()) {
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element.onScrollBoundsChange = callback
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}
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func (element *TextBox) updateMinimumSize () {
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textBounds := element.placeholderDrawer.LayoutBounds()
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_, inset := theme.InputPattern(theme.PatternState {
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Case: textBoxCase,
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})
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element.core.SetMinimumSize (
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textBounds.Dx() +
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theme.Padding() * 2 + inset[3] + inset[1],
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element.placeholderDrawer.LineHeight().Round() +
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theme.Padding() * 2 + inset[0] + inset[2])
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}
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func (element *TextBox) runOnChange () {
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if element.onChange != nil {
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element.onChange()
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}
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}
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func (element *TextBox) scrollToCursor () {
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if !element.core.HasImage() { return }
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bounds := element.Bounds().Inset(theme.Padding())
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bounds.Max.X -= element.valueDrawer.Em().Round()
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cursorPosition := element.valueDrawer.PositionOf(element.cursor)
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cursorPosition.X -= element.scroll
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maxX := bounds.Max.X
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minX := maxX
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if cursorPosition.X > maxX {
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element.scroll += cursorPosition.X - maxX
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} else if cursorPosition.X < minX {
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element.scroll -= minX - cursorPosition.X
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if element.scroll < 0 { element.scroll = 0 }
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}
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}
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func (element *TextBox) draw () {
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bounds := element.Bounds()
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// FIXME: take index into account
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pattern, inset := theme.InputPattern(theme.PatternState {
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Case: textBoxCase,
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Disabled: !element.Enabled(),
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Focused: element.Focused(),
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})
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artist.FillRectangle(element, pattern, bounds)
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if len(element.text) == 0 && !element.Focused() {
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// draw placeholder
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textBounds := element.placeholderDrawer.LayoutBounds()
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offset := image.Point {
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X: theme.Padding() + inset[3],
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Y: theme.Padding() + inset[0],
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}
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foreground, _ := theme.ForegroundPattern(theme.PatternState {
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Case: textBoxCase,
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Disabled: true,
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})
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element.placeholderDrawer.Draw (
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element,
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foreground,
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offset.Sub(textBounds.Min))
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} else {
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// draw input value
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textBounds := element.valueDrawer.LayoutBounds()
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offset := image.Point {
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X: theme.Padding() + inset[3] - element.scroll,
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Y: theme.Padding() + inset[0],
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}
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foreground, _ := theme.ForegroundPattern(theme.PatternState {
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Case: textBoxCase,
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Disabled: !element.Enabled(),
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})
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element.valueDrawer.Draw (
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element,
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foreground,
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offset.Sub(textBounds.Min))
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if element.Focused() {
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// cursor
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cursorPosition := element.valueDrawer.PositionOf (
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element.cursor)
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foreground, _ := theme.ForegroundPattern(theme.PatternState {
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Case: textBoxCase,
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})
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artist.Line (
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element,
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foreground, 1,
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cursorPosition.Add(offset),
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image.Pt (
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cursorPosition.X,
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cursorPosition.Y + element.valueDrawer.
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LineHeight().Round()).Add(offset))
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}
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}
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}
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