From 69acb2870733998316473d9f79c7a496bfeeab3c Mon Sep 17 00:00:00 2001
From: akupiec <kupiecart@gmail.com>
Date: Tue, 26 Jan 2021 16:27:20 +0100
Subject: [PATCH] undo / redo - HUD info

---
 src/js/game/history_manager.js              | 28 ++++++++++-----
 src/js/game/hud/parts/keybinding_overlay.js | 38 ++++++++++++++++++---
 2 files changed, 54 insertions(+), 12 deletions(-)

diff --git a/src/js/game/history_manager.js b/src/js/game/history_manager.js
index 8eef0768..f3c31758 100644
--- a/src/js/game/history_manager.js
+++ b/src/js/game/history_manager.js
@@ -4,12 +4,12 @@ import { KEYMAPPINGS } from "./key_action_mapper";
 
 class LiFoQueue {
     constructor(size = 20) {
-        this.size = size;
+        this._size = size;
         this.items = [];
     }
 
     enqueue(element) {
-        if (this.size < this.items.length + 1) {
+        if (this._size < this.items.length + 1) {
             this.items.shift();
         }
         this.items.push(element);
@@ -22,6 +22,10 @@ class LiFoQueue {
     clear() {
         this.items = [];
     }
+
+    isEmpty() {
+        return !this.items.length;
+    }
 }
 
 const ActionType = {
@@ -32,7 +36,7 @@ const ActionType = {
 export class HistoryManager {
     constructor(root) {
         this.root = root;
-        this._entities = new LiFoQueue();
+        this._forUndo = new LiFoQueue();
         this._forRedo = new LiFoQueue();
 
         this.initializeBindings();
@@ -43,21 +47,29 @@ export class HistoryManager {
         this.root.keyMapper.getBinding(KEYMAPPINGS.placement.redo).add(this._redo, this);
     }
 
+    get canUndo() {
+        return !this._forUndo.isEmpty();
+    }
+
+    get canRedo() {
+        return !this._forRedo.isEmpty();
+    }
+
     /**
      * @param {Entity} entity
      */
     addAction(entity) {
         this._forRedo.clear();
-        this._entities.enqueue({ type: ActionType.add, entity });
+        this._forUndo.enqueue({ type: ActionType.add, entity });
     }
 
     removeAction(entity) {
         this._forRedo.clear();
-        this._entities.enqueue({ type: ActionType.remove, entity });
+        this._forUndo.enqueue({ type: ActionType.remove, entity });
     }
 
     _undo() {
-        const { type, entity } = this._entities.dequeue() || {};
+        const { type, entity } = this._forUndo.dequeue() || {};
         if (!entity) {
             return;
         }
@@ -78,10 +90,10 @@ export class HistoryManager {
         }
         if (type === ActionType.remove && this.root.logic.checkCanPlaceEntity(entity)) {
             this._placeEntity(entity);
-            this._entities.enqueue({ type: ActionType.add, entity });
+            this._forUndo.enqueue({ type: ActionType.add, entity });
         }
         if (type === ActionType.add && this.root.logic.canDeleteBuilding(entity)) {
-            this._entities.enqueue({ type: ActionType.remove, entity: entity.clone() });
+            this._forUndo.enqueue({ type: ActionType.remove, entity: entity.clone() });
             this._removeEntity(entity);
         }
     }
diff --git a/src/js/game/hud/parts/keybinding_overlay.js b/src/js/game/hud/parts/keybinding_overlay.js
index 65919d3c..b3713646 100644
--- a/src/js/game/hud/parts/keybinding_overlay.js
+++ b/src/js/game/hud/parts/keybinding_overlay.js
@@ -120,6 +120,14 @@ export class HUDKeybindingOverlay extends BaseHUDPart {
         return this.root.camera.getIsMapOverlayActive();
     }
 
+    get undoActive() {
+        return !this.mapOverviewActive && !this.blueprintPlacementActive && this.root.historyMgr.canUndo;
+    }
+
+    get redoActive() {
+        return !this.mapOverviewActive && !this.blueprintPlacementActive && this.root.historyMgr.canRedo;
+    }
+
     /**
      * Initializes the element
      * @param {HTMLElement} parent
@@ -185,6 +193,20 @@ export class HUDKeybindingOverlay extends BaseHUDPart {
                 condition: () => !this.mapOverviewActive && !this.blueprintPlacementActive,
             },
 
+            {
+                // Undo
+                label: T.ingame.keybindingsOverlay.undo,
+                keys: [k.placement.undo],
+                condition: () => this.undoActive,
+            },
+
+            {
+                // Redo
+                label: T.ingame.keybindingsOverlay.redo,
+                keys: [k.placement.redo],
+                condition: () => this.redoActive,
+            },
+
             {
                 // Area select
                 label: T.ingame.keybindingsOverlay.selectBuildings,
@@ -297,10 +319,18 @@ export class HUDKeybindingOverlay extends BaseHUDPart {
                     case ADDER_TOKEN:
                         html += `+`;
                         break;
-                    default:
-                        html += `<code class="keybinding">${getStringForKeyCode(
-                            mapper.getBinding(/** @type {KeyCode} */ (key)).keyCode
-                        )}</code>`;
+                    default: {
+                        const binding = mapper.getBinding(/** @type {KeyCode} */ (key));
+                        if (binding.shift) {
+                            html += `<code class="keybinding">${getStringForKeyCode(16)}</code>`;
+                            html += `+`;
+                        }
+                        if (binding.ctrl) {
+                            html += `<code class="keybinding">${getStringForKeyCode(17)}</code>`;
+                            html += `+`;
+                        }
+                        html += `<code class="keybinding">${getStringForKeyCode(binding.keyCode)}</code>`;
+                    }
                 }
             }
             html += `<label>${handle.label}</label>`;