Re-organized module structure

elements/checkbox.go

@@ -0,0 +1,188 @@
+package elements
+
+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/textdraw"
+import "git.tebibyte.media/sashakoshka/tomo/elements/core"
+
+// Checkbox is a toggle-able checkbox with a label.
+type Checkbox struct {
+	*core.Core
+	*core.FocusableCore
+	core core.CoreControl
+	focusableControl core.FocusableCoreControl
+	drawer textdraw.Drawer
+
+	pressed bool
+	checked bool
+	text    string
+	
+	config config.Wrapped
+	theme  theme.Wrapped
+	
+	onToggle func ()
+}
+
+// NewCheckbox creates a new cbeckbox with the specified label text.
+func NewCheckbox (text string, checked bool) (element *Checkbox) {
+	element = &Checkbox { checked: checked }
+	element.theme.Case = theme.C("tomo", "checkbox")
+	element.Core, element.core = core.NewCore(element, element.draw)
+	element.FocusableCore,
+	element.focusableControl = core.NewFocusableCore(element.core, element.redo)
+	element.SetText(text)
+	return
+}
+
+func (element *Checkbox) HandleMouseDown (x, y int, button input.Button) {
+	if !element.Enabled() { return }
+	element.Focus()
+	element.pressed = true
+	if element.core.HasImage() {
+		element.draw()
+		element.core.DamageAll()
+	}
+}
+
+func (element *Checkbox) HandleMouseUp (x, y int, button input.Button) {
+	if button != input.ButtonLeft || !element.pressed { return }
+
+	element.pressed = false
+	within := image.Point { x, y }.
+		In(element.Bounds())
+	if within {
+		element.checked = !element.checked
+	}
+	
+	if element.core.HasImage() {
+		element.draw()
+		element.core.DamageAll()
+	}
+	if within && element.onToggle != nil {
+		element.onToggle()
+	}
+}
+
+func (element *Checkbox) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
+	if key == input.KeyEnter {
+		element.pressed = true
+		if element.core.HasImage() {
+			element.draw()
+			element.core.DamageAll()
+		}
+	}
+}
+
+func (element *Checkbox) HandleKeyUp (key input.Key, modifiers input.Modifiers) {
+	if key == input.KeyEnter && element.pressed {
+		element.pressed = false
+		element.checked = !element.checked
+		if element.core.HasImage() {
+			element.draw()
+			element.core.DamageAll()
+		}
+		if element.onToggle != nil {
+			element.onToggle()
+		}
+	}
+}
+
+// OnToggle sets the function to be called when the checkbox is toggled.
+func (element *Checkbox) OnToggle (callback func ()) {
+	element.onToggle = callback
+}
+
+// Value reports whether or not the checkbox is currently checked.
+func (element *Checkbox) Value () (checked bool) {
+	return element.checked
+}
+
+// SetEnabled sets whether this checkbox can be toggled or not.
+func (element *Checkbox) SetEnabled (enabled bool) {
+	element.focusableControl.SetEnabled(enabled)
+}
+
+// SetText sets the checkbox's label text.
+func (element *Checkbox) SetText (text string) {
+	if element.text == text { return }
+
+	element.text = text
+	element.drawer.SetText([]rune(text))
+	element.updateMinimumSize()
+	
+	if element.core.HasImage () {
+		element.draw()
+		element.core.DamageAll()
+	}
+}
+
+// SetTheme sets the element's theme.
+func (element *Checkbox) SetTheme (new theme.Theme) {
+	if new == element.theme.Theme { return }
+	element.theme.Theme = new
+	element.drawer.SetFace (element.theme.FontFace (
+		theme.FontStyleRegular,
+		theme.FontSizeNormal))
+	element.updateMinimumSize()
+	element.redo()
+}
+
+// SetConfig sets the element's configuration.
+func (element *Checkbox) SetConfig (new config.Config) {
+	if new == element.config.Config { return }
+	element.config.Config = new
+	element.updateMinimumSize()
+	element.redo()
+}
+
+func (element *Checkbox) updateMinimumSize () {
+	textBounds := element.drawer.LayoutBounds()
+	if element.text == "" {
+		element.core.SetMinimumSize(textBounds.Dy(), textBounds.Dy())
+	} else {
+		margin := element.theme.Margin(theme.PatternBackground)
+		element.core.SetMinimumSize (
+			textBounds.Dy() + margin.X + textBounds.Dx(),
+			textBounds.Dy())
+	}
+}
+
+func (element *Checkbox) redo () {
+	if element.core.HasImage () {
+		element.draw()
+		element.core.DamageAll()
+	}
+}
+
+func (element *Checkbox) draw () {
+	bounds := element.Bounds()
+	boxBounds := image.Rect(0, 0, bounds.Dy(), bounds.Dy()).Add(bounds.Min)
+
+	state := theme.State {
+		Disabled: !element.Enabled(),
+		Focused:  element.Focused(),
+		Pressed:  element.pressed,
+		On:       element.checked,
+	}
+
+	backgroundPattern := element.theme.Pattern (
+		theme.PatternBackground, state)
+	backgroundPattern.Draw(element.core, bounds)
+
+	pattern := element.theme.Pattern(theme.PatternButton, state)
+	pattern.Draw(element.core, boxBounds)
+
+	textBounds := element.drawer.LayoutBounds()
+	margin := element.theme.Margin(theme.PatternBackground)
+	offset := bounds.Min.Add(image.Point {
+		X: bounds.Dy() + margin.X,
+	})
+
+	offset.Y -= textBounds.Min.Y
+	offset.X -= textBounds.Min.X
+
+	foreground := element.theme.Color(theme.ColorForeground, state)
+	element.drawer.Draw(element.core, foreground, offset)
+}