Selectable: added ImGuiSelectableFlags_Highlight flag to highlight items independently from the hovered state. (#7820)

Demo: Make the Widget/List boxes show how to use forced highlighting.

docs/CHANGELOG.txt

@@ -147,6 +147,8 @@ Other changes:
 - Nav: fixed clicking window decorations (e.g. resize borders) from losing focused item when
   within a child window using ImGuiChildFlags_NavFlattened.
 - InputText: added '\' and '/' as word seperator. (#7824, #7704) [@reduf]
+- Selectable: added ImGuiSelectableFlags_Highlight flag to highlight items independently from
+  the hovered state. (#7820) [@rerilier]
 - Clipper: added SeekCursorForItem() function. When using ImGuiListClipper::Begin(INT_MAX) you can
   can use the clipper without knowing the amount of items beforehand. (#1311)
   In this situation, call ImGuiListClipper::SeekCursorForItem(items_count) as the end of your iteration

imgui.h

@@ -1228,6 +1228,7 @@ enum ImGuiSelectableFlags_
     ImGuiSelectableFlags_AllowDoubleClick   = 1 << 2,   // Generate press events on double clicks too
     ImGuiSelectableFlags_Disabled           = 1 << 3,   // Cannot be selected, display grayed out text
     ImGuiSelectableFlags_AllowOverlap       = 1 << 4,   // (WIP) Hit testing to allow subsequent widgets to overlap this one
+    ImGuiSelectableFlags_Highlight          = 1 << 5,   // Make the item be displayed as if it is hovered
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     ImGuiSelectableFlags_DontClosePopups    = ImGuiSelectableFlags_NoAutoClosePopups,   // Renamed in 1.91.0

imgui_demo.cpp

@@ -1357,18 +1357,18 @@ static void ShowDemoWindowWidgets(DemoWindowData* demo_data)
         // (your selection data could be an index, a pointer to the object, an id for the object, a flag intrusively
         // stored in the object itself, etc.)
         const char* items[] = { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIII", "JJJJ", "KKKK", "LLLLLLL", "MMMM", "OOOOOOO" };
-        static int item_current_idx = 0; // Here we store our selection data as an index.
+        static int item_selected_idx = 0; // Here we store our selection data as an index.
 
         // Pass in the preview value visible before opening the combo (it could technically be different contents or not pulled from items[])
-        const char* combo_preview_value = items[item_current_idx];
+        const char* combo_preview_value = items[item_selected_idx];
 
         if (ImGui::BeginCombo("combo 1", combo_preview_value, flags))
         {
             for (int n = 0; n < IM_ARRAYSIZE(items); n++)
             {
-                const bool is_selected = (item_current_idx == n);
+                const bool is_selected = (item_selected_idx == n);
                 if (ImGui::Selectable(items[n], is_selected))
-                    item_current_idx = n;
+                    item_selected_idx = n;
 
                 // Set the initial focus when opening the combo (scrolling + keyboard navigation focus)
                 if (is_selected)
@@ -1410,14 +1410,22 @@ static void ShowDemoWindowWidgets(DemoWindowData* demo_data)
         // (your selection data could be an index, a pointer to the object, an id for the object, a flag intrusively
         // stored in the object itself, etc.)
         const char* items[] = { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIII", "JJJJ", "KKKK", "LLLLLLL", "MMMM", "OOOOOOO" };
-        static int item_current_idx = 0; // Here we store our selection data as an index.
+        static int item_selected_idx = 0; // Here we store our selected data as an index.
+
+        static bool item_highlight = false;
+        int item_highlighted_idx = -1; // Here we store our highlighted data as an index.
+        ImGui::Checkbox("Highlight hovered item in second listbox", &item_highlight);
+
         if (ImGui::BeginListBox("listbox 1"))
         {
             for (int n = 0; n < IM_ARRAYSIZE(items); n++)
             {
-                const bool is_selected = (item_current_idx == n);
+                const bool is_selected = (item_selected_idx == n);
                 if (ImGui::Selectable(items[n], is_selected))
-                    item_current_idx = n;
+                    item_selected_idx = n;
+
+                if (item_highlight && ImGui::IsItemHovered())
+                    item_highlighted_idx = n;
 
                 // Set the initial focus when opening the combo (scrolling + keyboard navigation focus)
                 if (is_selected)
@@ -1433,9 +1441,10 @@ static void ShowDemoWindowWidgets(DemoWindowData* demo_data)
         {
             for (int n = 0; n < IM_ARRAYSIZE(items); n++)
             {
-                const bool is_selected = (item_current_idx == n);
-                if (ImGui::Selectable(items[n], is_selected))
-                    item_current_idx = n;
+                bool is_selected = (item_selected_idx == n);
+                ImGuiSelectableFlags flags = (item_highlighted_idx == n) ? ImGuiSelectableFlags_Highlight : 0;
+                if (ImGui::Selectable(items[n], is_selected, flags))
+                    item_selected_idx = n;
 
                 // Set the initial focus when opening the combo (scrolling + keyboard navigation focus)
                 if (is_selected)
@@ -1482,8 +1491,8 @@ static void ShowDemoWindowWidgets(DemoWindowData* demo_data)
             ImGui::TreePop();
         }
 
-        IMGUI_DEMO_MARKER("Widgets/Selectables/In columns");
-        if (ImGui::TreeNode("In columns"))
+        IMGUI_DEMO_MARKER("Widgets/Selectables/In Tables");
+        if (ImGui::TreeNode("In Tables"))
         {
             static bool selected[10] = {};
 

imgui_widgets.cpp

@@ -6894,14 +6894,15 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
     // Render
     if (is_visible)
     {
-        if (hovered || selected)
+        const bool highlighted = hovered || (flags & ImGuiSelectableFlags_Highlight);
+        if (highlighted || selected)
         {
             // FIXME-MULTISELECT: Styling: Color for 'selected' elements? ImGuiCol_HeaderSelected
             ImU32 col;
-            if (selected && !hovered)
+            if (selected && !highlighted)
                 col = GetColorU32(ImLerp(GetStyleColorVec4(ImGuiCol_Header), GetStyleColorVec4(ImGuiCol_HeaderHovered), 0.5f));
             else
-                col = GetColorU32((held && hovered) ? ImGuiCol_HeaderActive : hovered ? ImGuiCol_HeaderHovered : ImGuiCol_Header);
+                col = GetColorU32((held && highlighted) ? ImGuiCol_HeaderActive : highlighted ? ImGuiCol_HeaderHovered : ImGuiCol_Header);
             RenderFrame(bb.Min, bb.Max, col, false, 0.0f);
         }
         if (g.NavId == id)