Nav: Fixed navigation within tables/columns where item boundaries goes beyond columns limits. (#2221)

docs/CHANGELOG.txt

@@ -46,6 +46,8 @@ Other changes:
   showing when a sorting column has no visible name. (#6342) [@lukaasm]
 - InputText: Avoid setting io.WantTextInputNextFrame during the deactivation frame.
   (#6341) [@lukaasm]
+- Nav: Fixed navigation within tables/columns where item boundaries goes beyond columns limits,
+  unclipped bounding boxes would interfere with other columns. (#2221) [@zzzyap, @ocornut]
 - Debug Tools: Debug Log: Fixed not parsing 0xXXXXXXXX values for geo-locating on mouse
   hover hover when the identifier is at the end of the line. (#5855)
 - Backends: Clear bits sets io.BackendFlags on backend Shutdown(). (#6334, #6335] [@GereonV]

imgui.cpp

@@ -3743,7 +3743,10 @@ static void SetCurrentWindow(ImGuiWindow* window)
     g.CurrentWindow = window;
     g.CurrentTable = window && window->DC.CurrentTableIdx != -1 ? g.Tables.GetByIndex(window->DC.CurrentTableIdx) : NULL;
     if (window)
+    {
         g.FontSize = g.DrawListSharedData.FontSize = window->CalcFontSize();
+        ImGui::NavUpdateCurrentWindowIsScrollPushableX();
+    }
 }
 
 void ImGui::GcCompactTransientMiscBuffers()
@@ -6670,6 +6673,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         window->DC.NavLayerCurrent = ImGuiNavLayer_Main;
         window->DC.NavLayersActiveMask = window->DC.NavLayersActiveMaskNext;
         window->DC.NavLayersActiveMaskNext = 0x00;
+        window->DC.NavIsScrollPushableX = true;
         window->DC.NavHideHighlightOneFrame = false;
         window->DC.NavWindowHasScrollY = (window->ScrollMax.y > 0.0f);
 
@@ -10825,6 +10829,15 @@ static void ImGui::NavApplyItemToResult(ImGuiNavItemData* result)
     result->RectRel = WindowRectAbsToRel(window, g.LastItemData.NavRect);
 }
 
+// True when current work location may be scrolled horizontally when moving left / right.
+// This is generally always true UNLESS within a column. We don't have a vertical equivalent.
+void ImGui::NavUpdateCurrentWindowIsScrollPushableX()
+{
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = g.CurrentWindow;
+    window->DC.NavIsScrollPushableX = (g.CurrentTable == NULL && window->DC.CurrentColumns == NULL);
+}
+
 // We get there when either NavId == id, or when g.NavAnyRequest is set (which is updated by NavUpdateAnyRequestFlag above)
 // This is called after LastItemData is set.
 static void ImGui::NavProcessItem()
@@ -10832,9 +10845,16 @@ static void ImGui::NavProcessItem()
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = g.CurrentWindow;
     const ImGuiID id = g.LastItemData.ID;
-    const ImRect nav_bb = g.LastItemData.NavRect;
     const ImGuiItemFlags item_flags = g.LastItemData.InFlags;
 
+    // When inside a container that isn't scrollable with Left<>Right, clip NavRect accordingly (#2221)
+    if (window->DC.NavIsScrollPushableX == false)
+    {
+        g.LastItemData.NavRect.Min.x = ImClamp(g.LastItemData.NavRect.Min.x, window->ClipRect.Min.x, window->ClipRect.Max.x);
+        g.LastItemData.NavRect.Max.x = ImClamp(g.LastItemData.NavRect.Max.x, window->ClipRect.Min.x, window->ClipRect.Max.x);
+    }
+    const ImRect nav_bb = g.LastItemData.NavRect;
+
     // Process Init Request
     if (g.NavInitRequest && g.NavLayer == window->DC.NavLayerCurrent && (item_flags & ImGuiItemFlags_Disabled) == 0)
     {
@@ -10876,7 +10896,7 @@ static void ImGui::NavProcessItem()
         }
     }
 
-    // Update window-relative bounding box of navigated item
+    // Update information for currently focused/navigated item
     if (g.NavId == id)
     {
         if (g.NavWindow != window)

imgui.h

@@ -23,7 +23,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM > 12345')
 #define IMGUI_VERSION               "1.89.6 WIP"
-#define IMGUI_VERSION_NUM           18951
+#define IMGUI_VERSION_NUM           18952
 #define IMGUI_HAS_TABLE
 
 /*

imgui_internal.h

@@ -2232,6 +2232,7 @@ struct IMGUI_API ImGuiWindowTempData
     ImGuiNavLayer           NavLayerCurrent;        // Current layer, 0..31 (we currently only use 0..1)
     short                   NavLayersActiveMask;    // Which layers have been written to (result from previous frame)
     short                   NavLayersActiveMaskNext;// Which layers have been written to (accumulator for current frame)
+    bool                    NavIsScrollPushableX;   // Set when current work location may be scrolled horizontally when moving left / right. This is generally always true UNLESS within a column.
     bool                    NavHideHighlightOneFrame;
     bool                    NavWindowHasScrollY;    // Set per window when scrolling can be used (== ScrollMax.y > 0.0f)
 
@@ -2894,6 +2895,7 @@ namespace ImGui
     IMGUI_API void          NavMoveRequestCancel();
     IMGUI_API void          NavMoveRequestApplyResult();
     IMGUI_API void          NavMoveRequestTryWrapping(ImGuiWindow* window, ImGuiNavMoveFlags move_flags);
+    IMGUI_API void          NavUpdateCurrentWindowIsScrollPushableX();
     IMGUI_API void          ActivateItem(ImGuiID id);   // Remotely activate a button, checkbox, tree node etc. given its unique ID. activation is queued and processed on the next frame when the item is encountered again.
     IMGUI_API void          SetNavWindow(ImGuiWindow* window);
     IMGUI_API void          SetNavID(ImGuiID id, ImGuiNavLayer nav_layer, ImGuiID focus_scope_id, const ImRect& rect_rel);

imgui_tables.cpp

@@ -483,6 +483,7 @@ bool    ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
 
     // Make table current
     g.CurrentTable = table;
+    outer_window->DC.NavIsScrollPushableX = false; // Shortcut for NavUpdateCurrentWindowIsScrollPushableX();
     outer_window->DC.CurrentTableIdx = table_idx;
     if (inner_window != outer_window) // So EndChild() within the inner window can restore the table properly.
         inner_window->DC.CurrentTableIdx = table_idx;
@@ -1436,6 +1437,7 @@ void    ImGui::EndTable()
         g.CurrentTable->DrawSplitter = &temp_data->DrawSplitter;
     }
     outer_window->DC.CurrentTableIdx = g.CurrentTable ? g.Tables.GetIndex(g.CurrentTable) : -1;
+    NavUpdateCurrentWindowIsScrollPushableX();
 }
 
 // See "COLUMN SIZING POLICIES" comments at the top of this file
@@ -3902,6 +3904,7 @@ void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiOldColumnFl
     columns->Count = columns_count;
     columns->Flags = flags;
     window->DC.CurrentColumns = columns;
+    window->DC.NavIsScrollPushableX = false; // Shortcut for NavUpdateCurrentWindowIsScrollPushableX();
 
     columns->HostCursorPosY = window->DC.CursorPos.y;
     columns->HostCursorMaxPosX = window->DC.CursorMaxPos.x;
@@ -4092,6 +4095,7 @@ void ImGui::EndColumns()
     window->DC.CurrentColumns = NULL;
     window->DC.ColumnsOffset.x = 0.0f;
     window->DC.CursorPos.x = IM_FLOOR(window->Pos.x + window->DC.Indent.x + window->DC.ColumnsOffset.x);
+    NavUpdateCurrentWindowIsScrollPushableX();
 }
 
 void ImGui::Columns(int columns_count, const char* id, bool border)