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" // Switch is a toggle-able on/off switch with an optional label. It is // functionally identical to Checkbox, but plays a different semantic role. type Switch struct { *core.Core *core.SelectableCore core core.CoreControl selectableControl core.SelectableCoreControl drawer artist.TextDrawer pressed bool checked bool text string onToggle func () } // NewSwitch creates a new switch with the specified label text. func NewSwitch (text string, on bool) (element *Switch) { element = &Switch { checked: on, text: text } element.Core, element.core = core.NewCore(element) element.SelectableCore, element.selectableControl = core.NewSelectableCore (func () { if element.core.HasImage () { element.draw() element.core.DamageAll() } }) element.drawer.SetFace(theme.FontFaceRegular()) element.drawer.SetText([]rune(text)) element.calculateMinimumSize() return } // Resize changes this element's size. func (element *Switch) Resize (width, height int) { element.core.AllocateCanvas(width, height) element.draw() } func (element *Switch) HandleMouseDown (x, y int, button tomo.Button) { if !element.Enabled() { return } element.Select() element.pressed = true if element.core.HasImage() { element.draw() element.core.DamageAll() } } func (element *Switch) HandleMouseUp (x, y int, button tomo.Button) { if button != tomo.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 *Switch) HandleMouseMove (x, y int) { } func (element *Switch) HandleMouseScroll (x, y int, deltaX, deltaY float64) { } func (element *Switch) HandleKeyDown (key tomo.Key, modifiers tomo.Modifiers) { if key == tomo.KeyEnter { element.pressed = true if element.core.HasImage() { element.draw() element.core.DamageAll() } } } func (element *Switch) HandleKeyUp (key tomo.Key, modifiers tomo.Modifiers) { if key == tomo.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 switch is flipped. func (element *Switch) OnToggle (callback func ()) { element.onToggle = callback } // Value reports whether or not the switch is currently on. func (element *Switch) Value () (on bool) { return element.checked } // SetEnabled sets whether this switch can be flipped or not. func (element *Switch) SetEnabled (enabled bool) { element.selectableControl.SetEnabled(enabled) } // SetText sets the checkbox's label text. func (element *Switch) SetText (text string) { if element.text == text { return } element.text = text element.drawer.SetText([]rune(text)) element.calculateMinimumSize() if element.core.HasImage () { element.draw() element.core.DamageAll() } } func (element *Switch) calculateMinimumSize () { textBounds := element.drawer.LayoutBounds() lineHeight := element.drawer.LineHeight().Round() if element.text == "" { element.core.SetMinimumSize(lineHeight * 2, lineHeight) } else { element.core.SetMinimumSize ( lineHeight * 2 + theme.Padding() + textBounds.Dx(), lineHeight) } } func (element *Switch) draw () { bounds := element.core.Bounds() handleBounds := image.Rect(0, 0, bounds.Dy(), bounds.Dy()) gutterBounds := image.Rect(0, 0, bounds.Dy() * 2, bounds.Dy()) backgroundPattern, _ := theme.BackgroundPattern(theme.PatternState { }) artist.FillRectangle ( element.core, backgroundPattern, bounds) if element.checked { handleBounds.Min.X += bounds.Dy() handleBounds.Max.X += bounds.Dy() if element.pressed { handleBounds.Min.X -= 2 handleBounds.Max.X -= 2 } } else { if element.pressed { handleBounds.Min.X += 2 handleBounds.Max.X += 2 } } gutterPattern, _ := theme.GutterPattern(theme.PatternState { Disabled: !element.Enabled(), Selected: element.Selected(), Pressed: element.pressed, }) artist.FillRectangle(element.core, gutterPattern, gutterBounds) handlePattern, _ := theme.HandlePattern(theme.PatternState { Disabled: !element.Enabled(), Selected: element.Selected(), Pressed: element.pressed, }) artist.FillRectangle(element.core, handlePattern, handleBounds) textBounds := element.drawer.LayoutBounds() offset := image.Point { X: bounds.Dy() * 2 + theme.Padding(), } offset.Y -= textBounds.Min.Y offset.X -= textBounds.Min.X foreground, _ := theme.ForegroundPattern (theme.PatternState { Disabled: !element.Enabled(), }) element.drawer.Draw(element.core, foreground, offset) }