Add: SymbolLibrary - Delete Symbol

Editor/Gui/Graph/Dialogs/DeleteSymbolDialog.Draw.cs

@@ -0,0 +1,151 @@
+#nullable enable
+using ImGuiNET;
+using T3.Core.Operator;
+using T3.Editor.Gui.Styling;
+using T3.Editor.UiModel;
+
+namespace T3.Editor.Gui.Dialogs;
+
+internal sealed partial class DeleteSymbolDialog
+{
+    /// <summary>
+    /// Renders the main body of the delete confirmation dialog after symbol dependency analysis
+    /// has completed successfully.
+    /// </summary>
+    /// <param name="symbol">The symbol currently selected for deletion.</param>
+    /// <param name="info">Detailed dependency and classification information about the symbol
+    /// obtained from <see cref="SymbolAnalysis.TryGetSymbolInfo"/>.</param>
+    private static void DrawAnalysisUi(Symbol symbol, LocalSymbolInfo info)
+    {
+        var isProtected = TryGetRestriction(symbol, info, out var restriction);
+        var isNamespaceMain = IsNamespaceMainSymbol(symbol);
+        var symbolName = symbol.Name;
+
+        _allowDeletion = !isProtected && !symbol.SymbolPackage.IsReadOnly;
+
+        ImGui.PushStyleColor(ImGuiCol.Text, UiColors.Text.Rgba);
+        ImGui.TextWrapped(isProtected ? $"Can not delete [{symbolName}]" : $"Are you sure you want to delete [{symbolName}]?");
+        ImGui.PopStyleColor();
+
+        if (isProtected)
+        {
+            ImGui.PushFont(Fonts.FontBold);
+            ImGui.TextColored(UiColors.StatusAttention,
+                              isNamespaceMain ? "This symbol is attached to the project namespace." : $"You can not delete symbols that are {restriction}");
+            ImGui.PopFont();
+        }
+
+        if (isNamespaceMain)
+        {
+            ImGui.PushStyleColor(ImGuiCol.Text, UiColors.StatusAttention.Rgba);
+            ImGui.TextWrapped($"""
+                              Symbol [{symbolName}] acts as the main symbol for namespace [{symbol.Namespace}]. 
+                              Removing it directly can leave the project in a broken state. 
+                              Use the namespace delete workflow (todo) instead of deleting this symbol.
+                              """);
+            ImGui.PopStyleColor();
+
+            return;
+        }
+
+        if (!info.DependingSymbols.IsEmpty)
+        {
+            if (!_allowDeletion)
+            {
+                ImGui.PushStyleColor(ImGuiCol.Text, UiColors.StatusAttention.Rgba);
+                ImGui.TextWrapped(
+                    $"Symbol [{symbolName}] is used by [{info.DependingSymbols.Count}] other projects/symbols, " +
+                    "but deletion is blocked because it belongs to a protected library or read-only package.");
+                ImGui.PopStyleColor();
+            }
+            else
+            {
+                ImGui.PushStyleColor(ImGuiCol.Text, UiColors.StatusAttention.Rgba);
+                ImGui.TextWrapped($"[{symbolName}] is used in [{info.DependingSymbols.Count}] projects/symbols:");
+                ImGui.PopStyleColor();
+
+                ImGui.PushStyleColor(ImGuiCol.Text, UiColors.StatusAttention.Rgba);
+                ListSymbolNames(info.DependingSymbols);
+                ImGui.PopStyleColor();
+
+                ImGui.PushStyleColor(ImGuiCol.Text, UiColors.StatusAttention.Rgba);
+                ImGui.TextWrapped("Clicking Force delete will automatically disconnect/clean all usages. " +
+                                  "This may completely break these projects/symbols, and can *NOT* be undone.");
+                ImGui.PopStyleColor();
+            }
+        }
+        else
+        {
+            if (!_allowDeletion)
+            {
+                ImGui.PushStyleColor(ImGuiCol.Text, UiColors.StatusAttention.Rgba);
+                ImGui.TextWrapped($"Symbol [{symbolName}] is not used by other symbols, " +
+                                  $"but deletion is blocked because it belongs to a protected library or read-only package.");
+                ImGui.PopStyleColor();
+            }
+            else
+            {
+                ImGui.PushStyleColor(ImGuiCol.Text, UiColors.Text.Rgba);
+                ImGui.TextWrapped($"Symbol [{symbolName}] is not used by other symbols and can be safely deleted.");
+                ImGui.PopStyleColor();
+            }
+        }
+    }
+
+    /// <summary>
+    /// Renders a scrollable list of symbol names and their project namespaces for all
+    /// symbols that reference the symbol being deleted.
+    /// </summary>
+    /// <param name="symbolIds">
+    /// The set of symbol IDs that depend on the symbol currently considered for deletion.
+    /// </param>
+    private static void ListSymbolNames(IEnumerable<Guid> symbolIds)
+    {
+        if (_cachedMatches == null)
+        {
+            var allSymbolUis = EditorSymbolPackage.AllSymbolUis;
+            var idSet = symbolIds.ToHashSet();
+            _cachedMatches = allSymbolUis
+                            .Where(s => idSet.Contains(s.Symbol.Id))
+                            .OrderBy(s => s.Symbol.Namespace)
+                            .ThenBy(s => s.Symbol.Name)
+                            .ToList();
+        }
+
+        if (_cachedMatches.Count == 0)
+            return;
+
+        var fontSize = ImGui.GetFontSize();  // Current font size in pixels
+        const int maxVisibleItems = 5;
+        var itemHeight = fontSize + 4.0f;    // Font size + small padding
+        var scrollHeight = itemHeight * maxVisibleItems;
+
+        if (ImGui.BeginChild("SymbolList",
+                new Vector2(0, scrollHeight),
+                true))
+        {
+            var lastGroupName = string.Empty;
+            foreach (var symbolUi in _cachedMatches)
+            {
+                var projectName = symbolUi.Symbol.SymbolPackage.RootNamespace;
+                if (projectName != lastGroupName)
+                {
+                    lastGroupName = projectName;
+                    var avail    = ImGui.GetContentRegionAvail();
+                    var cursorPos = ImGui.GetCursorScreenPos();
+                    var drawList  = ImGui.GetWindowDrawList();
+                    var rectMax   = new Vector2(cursorPos.X + avail.X,
+                                                cursorPos.Y + Fonts.FontSmall.FontSize + 4);
+                    drawList.AddRectFilled(cursorPos, rectMax, UiColors.BackgroundFull.Fade(0.3f), 0.0f);
+
+                    CustomComponents.StylizedText(projectName, Fonts.FontSmall, UiColors.Text);
+                }
+
+                var symbolLabel = "  " + symbolUi.Symbol.Name;
+                CustomComponents.StylizedText(symbolLabel, Fonts.FontSmall, UiColors.Text);
+            }
+        }
+
+        ImGui.EndChild();
+    }
+}