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 selected bool text string drawer artist.TextDrawer onClick func () onSelectionRequest func () (granted bool) onSelectionMotionRequest func (tomo.SelectionDirection) (granted bool) } // 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.SetText(text) return } func (element *Button) Resize (width, height int) { element.core.AllocateCanvas(width, height) element.draw() } func (element *Button) HandleMouseDown (x, y int, button tomo.Button) { if !element.enabled { return } element.Select() if button != tomo.ButtonLeft { return } element.pressed = true if element.core.HasImage() { element.draw() element.core.DamageAll() } } func (element *Button) HandleMouseUp (x, y int, button tomo.Button) { if button != tomo.ButtonLeft { return } element.pressed = false if element.core.HasImage() { element.draw() element.core.DamageAll() } within := image.Point { x, y }. In(element.Bounds()) if !element.enabled { return } if within && element.onClick != nil { element.onClick() } } func (element *Button) HandleMouseMove (x, y int) { } func (element *Button) HandleMouseScroll (x, y int, deltaX, deltaY float64) { } func (element *Button) HandleKeyDown (key tomo.Key, modifiers tomo.Modifiers) { if !element.enabled { return } if key == tomo.KeyEnter { element.pressed = true if element.core.HasImage() { element.draw() element.core.DamageAll() } } } func (element *Button) HandleKeyUp(key tomo.Key, modifiers tomo.Modifiers) { if key == tomo.KeyEnter && element.pressed { element.pressed = false if element.core.HasImage() { element.draw() element.core.DamageAll() } if !element.enabled { return } if element.onClick != nil { element.onClick() } } } func (element *Button) Selected () (selected bool) { return element.selected } func (element *Button) Select () { if !element.enabled { return } if element.onSelectionRequest != nil { element.onSelectionRequest() } } func (element *Button) HandleSelection ( direction tomo.SelectionDirection, ) ( accepted bool, ) { direction = direction.Canon() if !element.enabled { return false } if element.selected && direction != tomo.SelectionDirectionNeutral { return false } element.selected = true if element.core.HasImage() { element.draw() element.core.DamageAll() } return true } func (element *Button) HandleDeselection () { element.selected = false if element.core.HasImage() { element.draw() element.core.DamageAll() } } func (element *Button) OnSelectionRequest (callback func () (granted bool)) { element.onSelectionRequest = callback } func (element *Button) OnSelectionMotionRequest ( callback func (direction tomo.SelectionDirection) (granted bool), ) { element.onSelectionMotionRequest = callback } // OnClick sets the function to be called when the button is clicked. func (element *Button) OnClick (callback func ()) { element.onClick = callback } // SetEnabled sets whether this button can be clicked or not. func (element *Button) SetEnabled (enabled bool) { if element.enabled == enabled { return } element.enabled = enabled if element.core.HasImage () { element.draw() element.core.DamageAll() } } // SetText sets the button's label text. func (element *Button) SetText (text string) { if element.text == text { return } element.text = text element.drawer.SetText([]rune(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.DamageAll() } } 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) }