package basicElements import "image" import "git.tebibyte.media/sashakoshka/tomo/input" import "git.tebibyte.media/sashakoshka/tomo/theme" import "git.tebibyte.media/sashakoshka/tomo/artist" import "git.tebibyte.media/sashakoshka/tomo/elements/core" var buttonCase = theme.C("basic", "button") // Button is a clickable button. type Button struct { *core.Core *core.FocusableCore core core.CoreControl focusableControl core.FocusableCoreControl drawer artist.TextDrawer pressed bool text string onClick func () } // NewButton creates a new button with the specified label text. func NewButton (text string) (element *Button) { element = &Button { } element.Core, element.core = core.NewCore(element.draw) element.FocusableCore, element.focusableControl = core.NewFocusableCore (func () { if element.core.HasImage () { element.draw() element.core.DamageAll() } }) element.drawer.SetFace(theme.FontFaceRegular()) element.SetText(text) return } func (element *Button) HandleMouseDown (x, y int, button input.Button) { if !element.Enabled() { return } if !element.Focused() { element.Focus() } if button != input.ButtonLeft { return } element.pressed = true if element.core.HasImage() { element.draw() element.core.DamageAll() } } func (element *Button) HandleMouseUp (x, y int, button input.Button) { if button != input.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 input.Key, modifiers input.Modifiers) { if !element.Enabled() { return } if key == input.KeyEnter { element.pressed = true if element.core.HasImage() { element.draw() element.core.DamageAll() } } } func (element *Button) HandleKeyUp(key input.Key, modifiers input.Modifiers) { if key == input.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() } } } // 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) { element.focusableControl.SetEnabled(enabled) } // 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() _, inset := theme.ButtonPattern(theme.PatternState { Case: buttonCase }) minimumSize := inset.Inverse().Apply(textBounds).Inset(-theme.Padding()) element.core.SetMinimumSize(minimumSize.Dx(), minimumSize.Dy()) if element.core.HasImage () { element.draw() element.core.DamageAll() } } func (element *Button) draw () { bounds := element.Bounds() pattern, inset := theme.ButtonPattern(theme.PatternState { Case: buttonCase, Disabled: !element.Enabled(), Focused: element.Focused(), Pressed: element.pressed, }) artist.FillRectangle(element, pattern, bounds) innerBounds := inset.Apply(bounds) textBounds := element.drawer.LayoutBounds() offset := image.Point { X: innerBounds.Min.X + (innerBounds.Dx() - textBounds.Dx()) / 2, Y: innerBounds.Min.Y + (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 foreground, _ := theme.ForegroundPattern (theme.PatternState { Case: buttonCase, Disabled: !element.Enabled(), }) element.drawer.Draw(element, foreground, offset) }