using Core.Game;
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using TowerDefense.Game;
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using TowerDefense.UI.HUD;
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using UnityEngine;
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using UnityEngine.UI;
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using GameUIState = TowerDefense.UI.HUD.GameUI.State;
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namespace TowerDefense.UI
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{
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/// <summary>
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/// In-game pause menu
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/// </summary>
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public class PauseMenu : MonoBehaviour
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{
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/// <summary>
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/// Enum to represent state of pause menu
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/// </summary>
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protected enum State
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{
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Open,
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LevelSelectPressed,
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RestartPressed,
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Closed
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}
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/// <summary>
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/// The CanvasGroup that holds the pause menu UI
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/// </summary>
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public Canvas pauseMenuCanvas;
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public Text titleText;
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public Text descriptionText;
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/// <summary>
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/// The buttons present in the pause menu
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/// </summary>
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public Button levelSelectConfirmButton;
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public Button restartConfirmButton;
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public Button levelSelectButton;
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public Button restartButton;
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public Image topPanel;
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/// <summary>
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/// Color to change the top panel to highlight confirmation button
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/// </summary>
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public Color topPanelDisabledColor = new Color(1, 1, 1, 1);
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/// <summary>
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/// State of pause menu
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/// </summary>
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protected State m_State;
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/// <summary>
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/// If the pause menu was opened/closed this frame
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/// </summary>
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bool m_MenuChangedThisFrame;
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/// <summary>
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/// Open the pause menu
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/// </summary>
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public void OpenPauseMenu()
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{
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SetPauseMenuCanvas(true);
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LevelItem level = GameManager.instance.GetLevelForCurrentScene();
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if (level == null)
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{
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return;
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}
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if (titleText != null)
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{
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titleText.text = level.name;
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}
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if (descriptionText != null)
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{
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descriptionText.text = level.description;
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}
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m_State = State.Open;
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}
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/// <summary>
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/// Fired when GameUI's State changes
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/// </summary>
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/// <param name="oldState">The State that GameUI is leaving</param>
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/// <param name="newState">The State that GameUI is entering</param>
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protected void OnGameUIStateChanged(GameUIState oldState, GameUIState newState)
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{
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m_MenuChangedThisFrame = true;
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if (newState == GameUIState.Paused)
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{
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OpenPauseMenu();
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}
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else
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{
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ClosePauseMenu();
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}
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}
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/// <summary>
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/// Level select button pressed, display/hide confirmation button
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/// </summary>
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public void LevelSelectPressed()
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{
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bool open = m_State == State.Open;
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restartButton.interactable = !open;
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topPanel.color = open ? topPanelDisabledColor : Color.white;
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levelSelectConfirmButton.gameObject.SetActive(open);
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m_State = open ? State.LevelSelectPressed : State.Open;
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}
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/// <summary>
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/// Restart button pressed, display/hide confirmation button
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/// </summary>
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public void RestartPressed()
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{
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bool open = m_State == State.Open;
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levelSelectButton.interactable = !open;
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topPanel.color = open ? topPanelDisabledColor : Color.white;
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restartConfirmButton.gameObject.SetActive(open);
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m_State = open ? State.RestartPressed : State.Open;
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}
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/// <summary>
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/// Close the pause menu
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/// </summary>
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public void ClosePauseMenu()
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{
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SetPauseMenuCanvas(false);
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levelSelectConfirmButton.gameObject.SetActive(false);
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restartConfirmButton.gameObject.SetActive(false);
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levelSelectButton.interactable = true;
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restartButton.interactable = true;
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topPanel.color = Color.white;
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m_State = State.Closed;
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}
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/// <summary>
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/// Hide the pause menu on awake
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/// </summary>
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protected void Awake()
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{
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SetPauseMenuCanvas(false);
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m_State = State.Closed;
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}
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/// <summary>
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/// Subscribe to GameUI's stateChanged event
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/// </summary>
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protected void Start()
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{
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if (GameUI.instanceExists)
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{
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GameUI.instance.stateChanged += OnGameUIStateChanged;
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}
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}
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/// <summary>
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/// Unpause the game if the game is paused and the Escape key is pressed
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/// </summary>
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protected virtual void Update()
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{
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if (m_MenuChangedThisFrame)
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{
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m_MenuChangedThisFrame = false;
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return;
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}
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if (UnityEngine.Input.GetKeyDown(KeyCode.Escape) && GameUI.instance.state == GameUIState.Paused)
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{
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Unpause();
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}
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}
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/// <summary>
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/// Show/Hide the pause menu canvas group
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/// </summary>
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protected void SetPauseMenuCanvas(bool enable)
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{
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pauseMenuCanvas.enabled = enable;
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}
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public void Pause()
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{
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if (GameUI.instanceExists)
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{
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GameUI.instance.Pause();
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}
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}
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public void Unpause()
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{
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if (GameUI.instanceExists)
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{
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GameUI.instance.Unpause();
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}
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}
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}
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}
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