89 lines
3.1 KiB
Go
89 lines
3.1 KiB
Go
package types
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import (
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"context"
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"lab.zaar.be/thefish/alchemyst-go/util/appctx"
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)
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type Screen interface {
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Enter()
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Exit()
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Render()
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HandleInput(input string)
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UseEcs() bool
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}
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type ScreenManager struct {
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ctx context.Context
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Screens map[string]Screen
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CurrentScreen Screen
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PreviousScreen Screen
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}
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// NewScreenManager is a convenience/constructor method to properly initialize a new ScreenManager
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func NewScreenManager(ctx context.Context) *ScreenManager {
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manager := ScreenManager{
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ctx:ctx,
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Screens: make(map[string]Screen),
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CurrentScreen: nil,
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}
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return &manager
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}
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func (sm *ScreenManager) AddScreen(screenName string, screen Screen) {
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// Check to see if a screen with the given screenName has already been added
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if _, ok := sm.Screens[screenName]; !ok {
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// A screen with the given name does not yet exist on the ScreenManager, go ahead and add it
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sm.Screens[screenName] = screen
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} else {
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appctx.Logger(sm.ctx).Warn().Msgf("A screen with name %v was already added to the ScreenManager %v!", screenName, sm)
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}
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}
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// RemoveScreen will remove a screen from the ScreenManager. This can be useful when a temporary screen needs to be
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// created, as it can be quickly added (rather than registering at game creation), and then removed when it is no
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// longer needed
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func (sm *ScreenManager) RemoveScreen(screenName string, screen Screen) {
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// Check if the given screenName exists in the ScreenManager
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if _, ok := sm.Screens[screenName]; ok {
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delete(sm.Screens, screenName)
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} else {
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// A screen with the given name does not exist
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appctx.Logger(sm.ctx).Warn().Msgf("A screen with name %v was not found on ScreenManager %v!", screenName, sm)
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}
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}
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// SetScreen will set the current screen property of the screen manager to the provided screen
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func (sm *ScreenManager) SetScreen(screen Screen) {
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// Call the exit function of the currentScreen, and set the currentScreen as the previousScreen
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// Only do this if there is a currentScreen
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if sm.CurrentScreen != nil {
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sm.CurrentScreen.Exit()
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sm.PreviousScreen = sm.CurrentScreen
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}
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// Set the provided screen as the currentScreen, and call the enter() function of the new currentScreen
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sm.CurrentScreen = screen
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sm.CurrentScreen.Enter()
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}
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// SetScreenByName takes a string representing the screen desired to navigate to. It will then transition the
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// ScreenManager to the specified screen, if one is found.
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func (sm *ScreenManager) SetScreenByName(screenName string) {
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// Check if the given screenName exists in the ScreenManager
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if _, ok := sm.Screens[screenName]; ok {
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// Call the exit function of the currentScreen, and set the currentScreen as the previousScreen
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// Only do this if there is a currentScreen
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if sm.CurrentScreen != nil {
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sm.CurrentScreen.Exit()
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sm.PreviousScreen = sm.CurrentScreen
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}
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// Set the provided screen as the currentScreen, and call the enter() function of the new currentScreen
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sm.CurrentScreen = sm.Screens[screenName]
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sm.CurrentScreen.Enter()
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} else {
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// A screen with the given name does not exist
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appctx.Logger(sm.ctx).Warn().Msgf("A screen with name %v was not found on ScreenManager %v!", screenName, sm)
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}
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} |