162 lines
4.2 KiB
Go
162 lines
4.2 KiB
Go
package basicElements
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import "image"
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import "git.tebibyte.media/sashakoshka/tomo/input"
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import "git.tebibyte.media/sashakoshka/tomo/theme"
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import "git.tebibyte.media/sashakoshka/tomo/config"
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import "git.tebibyte.media/sashakoshka/tomo/artist"
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import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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// Button is a clickable button.
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type Button 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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drawer artist.TextDrawer
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pressed bool
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text string
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config config.Config
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theme theme.Theme
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c theme.Case
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onClick func ()
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}
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// NewButton creates a new button with the specified label text.
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func NewButton (text string) (element *Button) {
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element = &Button {
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c: theme.C("basic", "button"),
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}
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element.Core, element.core = core.NewCore(element.draw)
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element.FocusableCore,
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element.focusableControl = core.NewFocusableCore(element.redo)
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element.SetText(text)
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return
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}
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func (element *Button) HandleMouseDown (x, y int, button input.Button) {
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if !element.Enabled() { return }
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if !element.Focused() { element.Focus() }
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if button != input.ButtonLeft { return }
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element.pressed = true
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element.redo()
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}
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func (element *Button) HandleMouseUp (x, y int, button input.Button) {
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if button != input.ButtonLeft { return }
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element.pressed = false
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element.redo()
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within := image.Point { x, y }.
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In(element.Bounds())
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if !element.Enabled() { return }
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if within && element.onClick != nil {
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element.onClick()
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}
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}
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func (element *Button) HandleMouseMove (x, y int) { }
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func (element *Button) HandleMouseScroll (x, y int, deltaX, deltaY float64) { }
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func (element *Button) HandleKeyDown (key input.Key, modifiers input.Modifiers) {
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if !element.Enabled() { return }
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if key == input.KeyEnter {
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element.pressed = true
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element.redo()
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}
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}
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func (element *Button) HandleKeyUp(key input.Key, modifiers input.Modifiers) {
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if key == input.KeyEnter && element.pressed {
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element.pressed = false
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element.redo()
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if !element.Enabled() { return }
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if element.onClick != nil {
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element.onClick()
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}
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}
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}
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// OnClick sets the function to be called when the button is clicked.
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func (element *Button) OnClick (callback func ()) {
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element.onClick = callback
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}
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// SetEnabled sets whether this button can be clicked or not.
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func (element *Button) SetEnabled (enabled bool) {
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element.focusableControl.SetEnabled(enabled)
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}
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// SetText sets the button's label text.
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func (element *Button) SetText (text string) {
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if element.text == text { return }
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element.text = text
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element.drawer.SetText([]rune(text))
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element.updateMinimumSize()
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element.redo()
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}
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// SetTheme sets the element's theme.
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func (element *Button) SetTheme (new theme.Theme) {
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element.theme = new
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element.drawer.SetFace (element.theme.FontFace (
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theme.FontStyleRegular,
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theme.FontSizeNormal,
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element.c))
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element.updateMinimumSize()
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element.redo()
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}
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// SetConfig sets the element's configuration.
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func (element *Button) SetConfig (new config.Config) {
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element.config = new
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element.updateMinimumSize()
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element.redo()
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}
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func (element *Button) updateMinimumSize () {
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textBounds := element.drawer.LayoutBounds()
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minimumSize := textBounds.Inset(-element.config.Padding())
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element.core.SetMinimumSize(minimumSize.Dx(), minimumSize.Dy())
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}
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func (element *Button) redo () {
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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 *Button) draw () {
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bounds := element.Bounds()
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state := theme.PatternState {
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Disabled: !element.Enabled(),
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Focused: element.Focused(),
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Pressed: element.pressed,
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}
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pattern := element.theme.Pattern(theme.PatternButton, element.c, state)
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artist.FillRectangle(element, pattern, bounds)
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textBounds := element.drawer.LayoutBounds()
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offset := image.Point {
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X: bounds.Min.X + (bounds.Dx() - textBounds.Dx()) / 2,
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Y: bounds.Min.Y + (bounds.Dy() - textBounds.Dy()) / 2,
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}
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// account for the fact that the bounding rectangle will be shifted over
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// due to the bounds origin being at the baseline of the first line
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offset.Y -= textBounds.Min.Y
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offset.X -= textBounds.Min.X
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foreground := element.theme.Pattern(theme.PatternForeground, element.c, state)
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element.drawer.Draw(element, foreground, offset)
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}
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