89 lines
1.9 KiB
Go
89 lines
1.9 KiB
Go
package d2screen
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import (
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"github.com/OpenDiablo2/OpenDiablo2/d2core/d2gui"
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"github.com/OpenDiablo2/OpenDiablo2/d2core/d2render"
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"github.com/OpenDiablo2/OpenDiablo2/d2core/d2ui"
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)
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type Screen interface{}
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type ScreenLoadHandler interface {
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OnLoad() error
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}
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type ScreenUnloadHandler interface {
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OnUnload() error
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}
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type ScreenRenderHandler interface {
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Render(target d2render.Surface) error
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}
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type ScreenAdvanceHandler interface {
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Advance(elapsed float64) error
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}
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var singleton struct {
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nextScreen Screen
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loadingScreen Screen
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currentScreen Screen
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}
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func SetNextScreen(screen Screen) {
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singleton.nextScreen = screen
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}
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func Advance(elapsed float64) error {
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if singleton.nextScreen != nil {
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if handler, ok := singleton.currentScreen.(ScreenUnloadHandler); ok {
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if err := handler.OnUnload(); err != nil {
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return err
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}
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}
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d2ui.Reset()
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d2gui.SetLayout(nil)
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if _, ok := singleton.nextScreen.(ScreenLoadHandler); ok {
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d2gui.ShowLoadScreen(0)
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d2gui.HideCursor()
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singleton.currentScreen = nil
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singleton.loadingScreen = singleton.nextScreen
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} else {
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singleton.currentScreen = singleton.nextScreen
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singleton.loadingScreen = nil
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}
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singleton.nextScreen = nil
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} else if singleton.loadingScreen != nil {
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handler := singleton.loadingScreen.(ScreenLoadHandler)
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if err := handler.OnLoad(); err != nil {
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return err
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}
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singleton.currentScreen = singleton.loadingScreen
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singleton.loadingScreen = nil
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d2gui.ShowCursor()
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d2gui.HideLoadScreen()
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} else if singleton.currentScreen != nil {
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if handler, ok := singleton.currentScreen.(ScreenAdvanceHandler); ok {
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if err := handler.Advance(elapsed); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func Render(surface d2render.Surface) error {
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if handler, ok := singleton.currentScreen.(ScreenRenderHandler); ok {
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if err := handler.Render(surface); err != nil {
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return err
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}
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}
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return nil
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}
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