TabBar, Style: added style option for the size of the Tab-Bar Overline (#7804)

Amend 21bda2e.

docs/CHANGELOG.txt

@@ -139,6 +139,8 @@ Other changes:
   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
   loop to position the layout cursor correctly. This is done automatically if provided a count to Begin().
+- TabBar, Style: added style.TabBarOverlineSize / ImGuiStyleVar_TabBarOverlineSize to manipulate
+  thickness of the horizontal line over selectable tabs. [@DctrNoob]
 - Style: close button and collapse/window-menu button hover highlight made rectangular instead of round.
 - Debug Tools: Added IMGUI_DEBUG_LOG(), ImGui::DebugLog() in public API. (#5855)
   Debug log entries add a imgui frame counter prefix + are redirected to ShowDebugLogWindow() and

imgui.cpp

@@ -1269,12 +1269,13 @@ ImGuiStyle::ImGuiStyle()
     TabBorderSize               = 0.0f;             // Thickness of border around tabs.
     TabMinWidthForCloseButton   = 0.0f;             // Minimum width for close button to appear on an unselected tab when hovered. Set to 0.0f to always show when hovering, set to FLT_MAX to never show close button unless selected.
     TabBarBorderSize            = 1.0f;             // Thickness of tab-bar separator, which takes on the tab active color to denote focus.
+    TabBarOverlineSize          = 2.0f;             // Thickness of tab-bar overline, which highlights the selected tab-bar.
     TableAngledHeadersAngle     = 35.0f * (IM_PI / 180.0f); // Angle of angled headers (supported values range from -50 degrees to +50 degrees).
     TableAngledHeadersTextAlign = ImVec2(0.5f,0.0f);// Alignment of angled headers within the cell
     ColorButtonPosition         = ImGuiDir_Right;   // Side of the color button in the ColorEdit4 widget (left/right). Defaults to ImGuiDir_Right.
     ButtonTextAlign             = ImVec2(0.5f,0.5f);// Alignment of button text when button is larger than text.
     SelectableTextAlign         = ImVec2(0.0f,0.0f);// Alignment of selectable text. Defaults to (0.0f, 0.0f) (top-left aligned). It's generally important to keep this left-aligned if you want to lay multiple items on a same line.
-    SeparatorTextBorderSize     = 3.0f;             // Thickkness of border in SeparatorText()
+    SeparatorTextBorderSize     = 3.0f;             // Thickness of border in SeparatorText()
     SeparatorTextAlign          = ImVec2(0.0f,0.5f);// Alignment of text within the separator. Defaults to (0.0f, 0.5f) (left aligned, center).
     SeparatorTextPadding        = ImVec2(20.0f,3.f);// Horizontal offset of text from each edge of the separator + spacing on other axis. Generally small values. .y is recommended to be == FramePadding.y.
     DisplayWindowPadding        = ImVec2(19,19);    // Window position are clamped to be visible within the display area or monitors by at least this amount. Only applies to regular windows.
@@ -1321,6 +1322,7 @@ void ImGuiStyle::ScaleAllSizes(float scale_factor)
     LogSliderDeadzone = ImTrunc(LogSliderDeadzone * scale_factor);
     TabRounding = ImTrunc(TabRounding * scale_factor);
     TabMinWidthForCloseButton = (TabMinWidthForCloseButton != FLT_MAX) ? ImTrunc(TabMinWidthForCloseButton * scale_factor) : FLT_MAX;
+    TabBarOverlineSize = ImTrunc(TabBarOverlineSize * scale_factor);
     SeparatorTextPadding = ImTrunc(SeparatorTextPadding * scale_factor);
     DisplayWindowPadding = ImTrunc(DisplayWindowPadding * scale_factor);
     DisplaySafeAreaPadding = ImTrunc(DisplaySafeAreaPadding * scale_factor);
@@ -3274,6 +3276,7 @@ static const ImGuiDataVarInfo GStyleVarInfo[] =
     { ImGuiDataType_Float, 1, (ImU32)offsetof(ImGuiStyle, TabRounding) },               // ImGuiStyleVar_TabRounding
     { ImGuiDataType_Float, 1, (ImU32)offsetof(ImGuiStyle, TabBorderSize) },             // ImGuiStyleVar_TabBorderSize
     { ImGuiDataType_Float, 1, (ImU32)offsetof(ImGuiStyle, TabBarBorderSize) },          // ImGuiStyleVar_TabBarBorderSize
+    { ImGuiDataType_Float, 1, (ImU32)offsetof(ImGuiStyle, TabBarOverlineSize) },        // ImGuiStyleVar_TabBarOverlineSize
     { ImGuiDataType_Float, 1, (ImU32)offsetof(ImGuiStyle, TableAngledHeadersAngle)},    // ImGuiStyleVar_TableAngledHeadersAngle
     { ImGuiDataType_Float, 2, (ImU32)offsetof(ImGuiStyle, TableAngledHeadersTextAlign)},// ImGuiStyleVar_TableAngledHeadersTextAlign
     { ImGuiDataType_Float, 2, (ImU32)offsetof(ImGuiStyle, ButtonTextAlign) },           // ImGuiStyleVar_ButtonTextAlign

imgui.h

@@ -1711,6 +1711,7 @@ enum ImGuiStyleVar_
     ImGuiStyleVar_TabRounding,              // float     TabRounding
     ImGuiStyleVar_TabBorderSize,            // float     TabBorderSize
     ImGuiStyleVar_TabBarBorderSize,         // float     TabBarBorderSize
+    ImGuiStyleVar_TabBarOverlineSize,       // float     TabBarOverlineSize
     ImGuiStyleVar_TableAngledHeadersAngle,  // float     TableAngledHeadersAngle
     ImGuiStyleVar_TableAngledHeadersTextAlign,// ImVec2  TableAngledHeadersTextAlign
     ImGuiStyleVar_ButtonTextAlign,          // ImVec2    ButtonTextAlign
@@ -2154,12 +2155,13 @@ struct ImGuiStyle
     float       TabBorderSize;              // Thickness of border around tabs.
     float       TabMinWidthForCloseButton;  // Minimum width for close button to appear on an unselected tab when hovered. Set to 0.0f to always show when hovering, set to FLT_MAX to never show close button unless selected.
     float       TabBarBorderSize;           // Thickness of tab-bar separator, which takes on the tab active color to denote focus.
+    float       TabBarOverlineSize;         // Thickness of tab-bar overline, which highlights the selected tab-bar.
     float       TableAngledHeadersAngle;    // Angle of angled headers (supported values range from -50.0f degrees to +50.0f degrees).
     ImVec2      TableAngledHeadersTextAlign;// Alignment of angled headers within the cell
     ImGuiDir    ColorButtonPosition;        // Side of the color button in the ColorEdit4 widget (left/right). Defaults to ImGuiDir_Right.
     ImVec2      ButtonTextAlign;            // Alignment of button text when button is larger than text. Defaults to (0.5f, 0.5f) (centered).
     ImVec2      SelectableTextAlign;        // Alignment of selectable text. Defaults to (0.0f, 0.0f) (top-left aligned). It's generally important to keep this left-aligned if you want to lay multiple items on a same line.
-    float       SeparatorTextBorderSize;    // Thickkness of border in SeparatorText()
+    float       SeparatorTextBorderSize;    // Thickness of border in SeparatorText()
     ImVec2      SeparatorTextAlign;         // Alignment of text within the separator. Defaults to (0.0f, 0.5f) (left aligned, center).
     ImVec2      SeparatorTextPadding;       // Horizontal offset of text from each edge of the separator + spacing on other axis. Generally small values. .y is recommended to be == FramePadding.y.
     ImVec2      DisplayWindowPadding;       // Apply to regular windows: amount which we enforce to keep visible when moving near edges of your screen.

imgui_demo.cpp

@@ -7633,6 +7633,8 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             ImGui::SliderFloat("FrameBorderSize", &style.FrameBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::SliderFloat("TabBorderSize", &style.TabBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::SliderFloat("TabBarBorderSize", &style.TabBarBorderSize, 0.0f, 2.0f, "%.0f");
+            ImGui::SliderFloat("TabBarOverlineSize", &style.TabBarOverlineSize, 0.0f, 2.0f, "%.0f");
+            ImGui::SameLine(); HelpMarker("Overline is only drawn over the selected tab when ImGuiTabBarFlags_DrawSelectedOverline is set.");
 
             ImGui::SeparatorText("Rounding");
             ImGui::SliderFloat("WindowRounding", &style.WindowRounding, 0.0f, 12.0f, "%.0f");

imgui_widgets.cpp

@@ -9917,13 +9917,13 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
     ImDrawList* display_draw_list = window->DrawList;
     const ImU32 tab_col = GetColorU32((held || hovered) ? ImGuiCol_TabHovered : tab_contents_visible ? (tab_bar_focused ? ImGuiCol_TabSelected : ImGuiCol_TabDimmedSelected) : (tab_bar_focused ? ImGuiCol_Tab : ImGuiCol_TabDimmed));
     TabItemBackground(display_draw_list, bb, flags, tab_col);
-    if (tab_contents_visible && (tab_bar->Flags & ImGuiTabBarFlags_DrawSelectedOverline))
+    if (tab_contents_visible && (tab_bar->Flags & ImGuiTabBarFlags_DrawSelectedOverline) && style.TabBarOverlineSize > 0.0f)
     {
         float x_offset = IM_TRUNC(0.4f * style.TabRounding);
         if (x_offset < 2.0f * g.CurrentDpiScale)
             x_offset = 0.0f;
         float y_offset = 1.0f * g.CurrentDpiScale;
-        display_draw_list->AddLine(bb.GetTL() + ImVec2(x_offset, y_offset), bb.GetTR() + ImVec2(-x_offset, y_offset), GetColorU32(tab_bar_focused ? ImGuiCol_TabSelectedOverline : ImGuiCol_TabDimmedSelectedOverline), 2.0f * g.CurrentDpiScale);
+        display_draw_list->AddLine(bb.GetTL() + ImVec2(x_offset, y_offset), bb.GetTR() + ImVec2(-x_offset, y_offset), GetColorU32(tab_bar_focused ? ImGuiCol_TabSelectedOverline : ImGuiCol_TabDimmedSelectedOverline), style.TabBarOverlineSize);
     }
     RenderNavHighlight(bb, id);