Add a tab showing the production summary (shpaass#38)

I tried to reuse the existing UI of YAFC, so I based the whole thing on
a `ProjectPageContents` and a `ProjectPageView`, so it would be
recognized and fit into the `MainScreen` (tabs) and serialization.

The UI of the new 'Summary' tab is ugly, I tried making it nicer, but I
found it hard to understand the `ImGui` and its features and how to use
them... So I propose this could be further improved om in separate PRs
to get the basic functionality/feature into YAFC already and make it
available for everyone (I used it a lot and cannot live without this
anymore).

I also fixed some issues I found while implementing the Summary tab,
moved to shpaass#31 and shpaass#34, except for:
* calculating `DatGrid` width when header is not used (I found the
header useless here)

The original idea is from
ShadowTheAge#123

YAFC/Widgets/DataGrid.cs

@@ -89,6 +89,14 @@ private void BuildHeaderResizer(ImGui gui, DataColumn<TData> column, Rect rect)
             }
         }
 
+        private void CalculateWidth(ImGui gui) {
+            var x = 0f;
+            foreach (var column in columns) {
+                x += column.width + spacing;
+            }
+            width = MathF.Max(x + 0.2f - spacing, gui.width - 1f);
+        }
+
         public void BuildHeader(ImGui gui) {
             var spacing = innerPadding.left + innerPadding.right;
             var x = 0f;
@@ -111,7 +119,7 @@ public void BuildHeader(ImGui gui) {
                     }
                 }
             }
-            width = MathF.Max(x + 0.2f - spacing, gui.width - 1f);
+            CalculateWidth(gui);
 
             var separator = gui.AllocateRect(x, 0.1f);
             if (gui.isBuilding) {
@@ -141,6 +149,7 @@ public Rect BuildRow(ImGui gui, TData element, float startX = 0f) {
                 buildGroup.Complete();
             }
 
+            CalculateWidth(gui);
             var rect = gui.lastRect;
             var bottom = gui.lastRect.Bottom;
             if (gui.isBuilding)

YAFC/Widgets/MainScreenTabBar.cs

@@ -41,7 +41,7 @@ private void BuildContents(ImGui gui) {
                             changePageTo = prevPage;
                             changePage = isActive ? 1 : 2;
                         }
-                        project.RecordUndo(true).displayPages.RemoveAt(i);
+                        screen.ClosePage(pageGuid);
                         i--;
                     }
                 }

YAFC/Windows/MainScreen.cs

@@ -12,6 +12,8 @@
 
 namespace YAFC {
     public class MainScreen : WindowMain, IKeyboardFocus, IProgress<(string, string)> {
+        ///<summary>Unique ID for the Summary page</summary>
+        public static readonly Guid SummaryGuid = Guid.Parse("9bdea333-4be2-4be3-b708-b36a64672a40");
         public static MainScreen Instance { get; private set; }
         private readonly ObjectTooltip objectTooltip = new ObjectTooltip();
         private readonly List<PseudoScreen> pseudoScreens = new List<PseudoScreen>();
@@ -28,6 +30,7 @@ public class MainScreen : WindowMain, IKeyboardFocus, IProgress<(string, string)
         private ProjectPage _secondaryPage;
         public ProjectPage secondaryPage => _secondaryPage;
         private ProjectPageView secondaryPageView;
+        private readonly SummaryView summaryView;
 
         private bool analysisUpdatePending;
         private SearchQuery pageSearch;
@@ -40,9 +43,11 @@ public class MainScreen : WindowMain, IKeyboardFocus, IProgress<(string, string)
         private readonly Dictionary<Type, ProjectPageView> secondaryPageViews = new Dictionary<Type, ProjectPageView>();
 
         public MainScreen(int display, Project project) : base(default) {
+            summaryView = new SummaryView();
             RegisterPageView<ProductionTable>(new ProductionTableView());
             RegisterPageView<AutoPlanner>(new AutoPlannerView());
             RegisterPageView<ProductionSummary>(new ProductionSummaryView());
+            RegisterPageView<Summary>(summaryView);
             searchGui = new ImGui(BuildSearch, new Padding(1f)) { boxShadow = RectangleBorder.Thin, boxColor = SchemeColor.Background };
             Instance = this;
             tabBar = new MainScreenTabBar(this);
@@ -71,10 +76,17 @@ private void SetProject(Project project) {
             if (project.displayPages.Count == 0)
                 project.displayPages.Add(project.pages[0].guid);
 
+            // Hack to activate all page solvers for the summary view
+            foreach (var page in project.pages) {
+                page.SetActive(true);
+                page.SetActive(false);
+            }
+
             SetActivePage(project.FindPage(project.displayPages[0]));
             project.metaInfoChanged += ProjectOnMetaInfoChanged;
             project.settings.changed += ProjectSettingsChanged;
             InputSystem.Instance.SetDefaultKeyboardFocus(this);
+            summaryView.SetProject(project);
         }
 
         private void ProjectSettingsChanged(bool visualOnly) {
@@ -338,6 +350,9 @@ private void SettingsDropdown(ImGui gui) {
             if (gui.BuildContextMenuButton("Preferences") && gui.CloseDropdown())
                 PreferencesScreen.Show();
 
+            if (gui.BuildContextMenuButton("Summary") && gui.CloseDropdown())
+                ShowSummaryTab();
+
             if (gui.BuildContextMenuButton("Never Enough Items Explorer", "Ctrl+" + ImGuiUtils.ScanToString(SDL.SDL_Scancode.SDL_SCANCODE_N)) && gui.CloseDropdown())
                 ShowNeie();
 
@@ -443,6 +458,24 @@ public void ClosePseudoScreen(PseudoScreen screen) {
             rootGui.Rebuild();
         }
 
+        public void ClosePage(Guid page) {
+            project.RecordUndo(true).displayPages.Remove(page);
+        }
+
+        public void ShowSummaryTab() {
+
+            ProjectPage summaryPage = project.FindPage(SummaryGuid);
+            if (summaryPage == null) {
+
+                summaryPage = new ProjectPage(project, typeof(Summary), false, SummaryGuid) {
+                    name = "Summary",
+                };
+                project.pages.Add(summaryPage);
+            }
+
+            SetActivePage(summaryPage);
+        }
+
         public bool KeyDown(SDL.SDL_Keysym key) {
             var ctrl = (key.mod & SDL.SDL_Keymod.KMOD_CTRL) != 0;
             if (ctrl) {

YAFC/Windows/ProjectPageSettingsPanel.cs

@@ -68,14 +68,20 @@ public override void Build(ImGui gui) {
 
                 gui.allocator = RectAllocator.LeftRow;
                 if (editingPage != null && gui.BuildRedButton("Delete page")) {
-                    Project.current.RemovePage(editingPage);
+                    if (editingPage.canDelete) {
+                        Project.current.RemovePage(editingPage);
+                    }
+                    else {
+                        // Only hide if the (singleton) page cannot be deleted
+                        MainScreen.Instance.ClosePage(editingPage.guid);
+                    }
                     Close();
                 }
             }
         }
 
         private void OtherToolsDropdown(ImGui gui) {
-            if (gui.BuildContextMenuButton("Duplicate page")) {
+            if (editingPage.guid != MainScreen.SummaryGuid && gui.BuildContextMenuButton("Duplicate page")) {
                 gui.CloseDropdown();
                 var project = editingPage.owner;
                 var collector = new ErrorCollector();
@@ -92,7 +98,7 @@ private void OtherToolsDropdown(ImGui gui) {
                 }
             }
 
-            if (gui.BuildContextMenuButton("Share (export string to clipboard)")) {
+            if (editingPage.guid != MainScreen.SummaryGuid && gui.BuildContextMenuButton("Share (export string to clipboard)")) {
                 gui.CloseDropdown();
                 var data = JsonUtils.SaveToJson(editingPage);
                 using (var targetStream = new MemoryStream()) {

YAFC/Workspace/ProductionTable/ProductionTableView.cs

@@ -712,9 +712,9 @@ private void DrawDesiredProduct(ImGui gui, ProductionLink element) {
                 element.RecordUndo().amount = newAmount;
         }
 
-        public override void Rebuild(bool visuaOnly = false) {
+        public override void Rebuild(bool visualOnly = false) {
             flatHierarchyBuilder.SetData(model);
-            base.Rebuild(visuaOnly);
+            base.Rebuild(visualOnly);
         }
 
         private void BuildGoodsIcon(ImGui gui, Goods goods, ProductionLink link, float amount, ProductDropdownType dropdownType, RecipeRow recipe, ProductionTable context, Goods[] variants = null) {