120 lines
2.5 KiB
Go
120 lines
2.5 KiB
Go
package etk
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import (
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"fmt"
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"image"
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"math"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
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"github.com/hajimehoshi/ebiten/v2"
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)
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var root Widget
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var (
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lastWidth, lastHeight int
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lastX, lastY = -math.MaxInt, -math.MaxInt
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)
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func SetRoot(w Widget) {
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root = w
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}
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func Layout(outsideWidth, outsideHeight int) {
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if root == nil {
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panic("no root widget specified")
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}
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if outsideWidth != lastWidth || outsideHeight != lastHeight {
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root.SetRect(image.Rect(0, 0, outsideWidth, outsideHeight))
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lastWidth, lastHeight = outsideWidth, outsideHeight
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}
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}
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func Update() error {
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if root == nil {
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panic("no root widget specified")
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}
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x, y := ebiten.CursorPosition()
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cursor := image.Point{x, y}
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if lastX == -math.MaxInt && lastY == -math.MaxInt {
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lastX, lastY = x, y
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}
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// TODO handle touch input
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var pressed bool
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for _, binding := range Bindings.ConfirmMouse {
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pressed = ebiten.IsMouseButtonPressed(binding)
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if pressed {
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break
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}
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}
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var clicked bool
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for _, binding := range Bindings.ConfirmMouse {
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clicked = inpututil.IsMouseButtonJustReleased(binding)
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if clicked {
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break
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}
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}
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_, _, err := update(root, cursor, pressed, clicked, false, false)
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return err
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}
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func update(w Widget, cursor image.Point, pressed bool, clicked bool, mouseHandled bool, keyboardHandled bool) (bool, bool, error) {
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var err error
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children := w.Children()
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for _, child := range children {
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mouseHandled, keyboardHandled, err = update(child, cursor, pressed, clicked, mouseHandled, keyboardHandled)
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if err != nil {
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return false, false, err
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} else if mouseHandled && keyboardHandled {
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return true, true, nil
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}
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}
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if !mouseHandled && cursor.In(w.Rect()) {
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_, err = w.HandleMouse(cursor, pressed, clicked)
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if err != nil {
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return false, false, fmt.Errorf("failed to handle widget mouse input: %s", err)
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}
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}
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if !keyboardHandled {
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_, err = w.HandleKeyboard()
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if err != nil {
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return false, false, fmt.Errorf("failed to handle widget keyboard input: %s", err)
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}
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}
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return mouseHandled, keyboardHandled, nil
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}
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func Draw(screen *ebiten.Image) error {
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if root == nil {
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panic("no root widget specified")
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}
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return draw(root, screen)
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}
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func draw(w Widget, screen *ebiten.Image) error {
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err := w.Draw(screen)
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if err != nil {
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return fmt.Errorf("failed to draw widget: %s", err)
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}
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children := w.Children()
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for _, child := range children {
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err = draw(child, screen)
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if err != nil {
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return fmt.Errorf("failed to draw widget: %s", err)
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}
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}
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return nil
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}
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