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|
package ui
import (
"log"
"slices"
"github.com/hajimehoshi/ebiten/v2"
)
// Container to organise multiple Widgets
// A collection does implement the Widget interface and thus can be nested in
// another Collection.
type Collection struct {
Width, Height int
widgets []Widget
focused Widget
hovering Widget
}
type CollectionInterface interface {
Widget
Widgets() []Widget
Clear()
AddWidget(Widget)
FindWidget(Widget) int
RemoveWidget(Widget)
RemoveWidgetAt(int)
}
func (c *Collection) Layout() (int, int) {
return c.Width, c.Height
}
func (c *Collection) Widgets() []Widget {
return c.widgets
}
func (c *Collection) Clear() {
c.widgets = []Widget{}
}
func (c *Collection) AddWidget(w Widget) {
if w == nil {
log.Panicf("Adding nil widget to collection")
}
if slices.Contains(c.widgets, w) {
log.Panicf("Double insertion of %v", w)
}
c.widgets = append(c.widgets, w)
}
// MoveIdxToLast shifts the widget at index idx to the last position.
func (c *Collection) MoveIdxToLast(idx int) {
w := c.widgets[idx]
after := c.widgets[idx+1:]
c.widgets = c.widgets[:idx]
c.widgets = append(c.widgets, after...)
c.widgets = append(c.widgets, w)
}
func (c *Collection) FindWidget(toFind Widget) int {
for i, w := range c.widgets {
if w != toFind {
continue
}
return i
}
return -1
}
func (c *Collection) RemoveWidget(widget Widget) {
idx := c.FindWidget(widget)
if idx != -1 {
c.RemoveWidgetAt(idx)
}
}
func (c *Collection) RemoveWidgetAt(idx int) {
nwidgets := len(c.widgets)
c.widgets[idx] = c.widgets[nwidgets-1]
c.widgets = c.widgets[:nwidgets-1]
}
func (c *Collection) Draw(screen *ebiten.Image) {
for _, w := range c.widgets {
w.Draw(screen)
}
}
func (c *Collection) Contains(x, y int) bool {
for _, w := range c.widgets {
if w.Contains(x, y) {
return true
}
}
return false
}
func (c *Collection) FindWidgetAt(x, y int) Widget {
// Iterate the widget in reverse order to ensure that upper widgets are
// considered first
for i := len(c.widgets) - 1; i >= 0; i-- {
w := c.widgets[i]
if !w.Contains(x, y) {
continue
}
return w
}
return nil
}
func (c *Collection) FindObjectAt(x, y int) any {
// Iterate the widget in reverse order to ensure that upper widgets are
// considered first
for i := len(c.widgets) - 1; i >= 0; i-- {
w := c.widgets[i]
if o := w.FindObjectAt(x, y); o != nil {
return o
}
}
return nil
}
func (c *Collection) switchFocus(fcsbl Widget) {
log.Printf("switch focus from %v to %v\n", c.focused, fcsbl)
if c.focused != nil {
c.focused.Focus(false)
}
if fcsbl != nil {
fcsbl.Focus(true)
c.focused = fcsbl
} else {
c.focused = nil
}
}
func (c *Collection) IsUpdatable() bool {
return true
}
func (c *Collection) updateWidgets() error {
// Update all updatables
for _, w := range c.widgets {
if w.IsUpdatable() {
if err := w.Update(); err != nil {
return err
}
}
}
return nil
}
func (c *Collection) Update() error {
defer c.updateWidgets()
for i := len(Input) - 1; i >= 0; i-- {
ev := Input[i]
w := c.FindWidgetAt(ev.X, ev.Y)
if w != nil {
switch ev.Kind {
case Click, Tap:
// Only consider taps or left clicks
if w.IsClickable() && (ev.Kind != Click || ev.Ctx.(ClickCtx).Btn == ebiten.MouseButtonLeft) {
w.Click(ev.X, ev.Y)
ConsumeInput(i)
}
if w.IsFocusable() && (ev.Kind != Click || ev.Ctx.(ClickCtx).Btn == ebiten.MouseButtonLeft) {
c.switchFocus(w)
}
case Scroll, Pan:
if w.IsScrollable() {
s := ev.Ctx.(DistanceCtx)
w.Scroll(s.scrollX, s.scrollY)
ConsumeInput(i)
}
case Text:
case HoverEnd:
if c.hovering != nil {
c.hovering.Hover(false, ev.X, ev.Y)
c.hovering = nil
}
case HoverStart:
if w.IsHoverable() {
w.Hover(true, ev.X, ev.Y)
c.hovering = w
}
}
}
}
return nil
}
// The events for the contained widgets
// are emitted during the collections
// Update method.
func (c *Collection) IsClickable() bool {
return false
}
func (c *Collection) Click(int, int) {}
func (c *Collection) IsScrollable() bool {
return false
}
func (c *Collection) Scroll(int, int) {}
func (c *Collection) IsFocusable() bool {
return false
}
func (c *Collection) Focus(bool) {}
|
