* All private Doodle source code into the pkg/ folder. * Potentially public code into the lib/ folder. * Centralize the logger into a subpackage.
123 lines
2.5 KiB
Go
123 lines
2.5 KiB
Go
package ui
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import (
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"errors"
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"fmt"
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"git.kirsle.net/apps/doodle/lib/render"
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"git.kirsle.net/apps/doodle/lib/ui/theme"
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)
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// Button is a clickable button.
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type Button struct {
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BaseWidget
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child Widget
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// Private options.
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hovering bool
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clicked bool
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}
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// NewButton creates a new Button.
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func NewButton(name string, child Widget) *Button {
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w := &Button{
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child: child,
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}
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w.IDFunc(func() string {
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return fmt.Sprintf("Button<%s>", name)
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})
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w.Configure(Config{
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BorderSize: 2,
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BorderStyle: BorderRaised,
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OutlineSize: 1,
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OutlineColor: theme.ButtonOutlineColor,
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Background: theme.ButtonBackgroundColor,
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})
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w.Handle(MouseOver, func(p render.Point) {
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w.hovering = true
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w.SetBackground(theme.ButtonHoverColor)
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})
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w.Handle(MouseOut, func(p render.Point) {
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w.hovering = false
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w.SetBackground(theme.ButtonBackgroundColor)
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})
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w.Handle(MouseDown, func(p render.Point) {
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w.clicked = true
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w.SetBorderStyle(BorderSunken)
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})
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w.Handle(MouseUp, func(p render.Point) {
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w.clicked = false
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w.SetBorderStyle(BorderRaised)
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})
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return w
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}
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// Children returns the button's child widget.
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func (w *Button) Children() []Widget {
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return []Widget{w.child}
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}
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// Compute the size of the button.
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func (w *Button) Compute(e render.Engine) {
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// Compute the size of the inner widget first.
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w.child.Compute(e)
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// Auto-resize only if we haven't been given a fixed size.
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if !w.FixedSize() {
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size := w.child.Size()
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w.Resize(render.Rect{
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W: size.W + w.BoxThickness(2),
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H: size.H + w.BoxThickness(2),
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})
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}
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}
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// SetText conveniently sets the button text, for Label children only.
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func (w *Button) SetText(text string) error {
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if label, ok := w.child.(*Label); ok {
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label.Text = text
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}
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return errors.New("child is not a Label widget")
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}
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// Present the button.
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func (w *Button) Present(e render.Engine, P render.Point) {
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if w.Hidden() {
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return
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}
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w.Compute(e)
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w.MoveTo(P)
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var (
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S = w.Size()
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ChildSize = w.child.Size()
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)
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// Draw the widget's border and everything.
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w.DrawBox(e, P)
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// Offset further if we are currently sunken.
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var clickOffset int32
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if w.clicked {
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clickOffset++
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}
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// Where to place the child widget.
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moveTo := render.Point{
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X: P.X + w.BoxThickness(1) + clickOffset,
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Y: P.Y + w.BoxThickness(1) + clickOffset,
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}
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// If we're bigger than we need to be, center the child widget.
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if S.Bigger(ChildSize) {
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moveTo.X = P.X + (S.W / 2) - (ChildSize.W / 2)
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}
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// Draw the text label inside.
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w.child.Present(e, moveTo)
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}
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