Styles, Tabs: (Breaking) Renamed TabMinWidthForCloseButton to TabCloseButtonMinWidthUnselected. Added TabCloseButtonMinWidthSelected. (#8387)

docs/CHANGELOG.txt

@@ -42,6 +42,7 @@ HOW TO UPDATE?
 Breaking changes:
 
 - Renamed ImFontConfig::GlyphExtraSpacing.x option to GlyphExtraAdvanceX. (#242)
+- Renamed style.TabMinWidthForCloseButton to style.TabCloseButtonMinWidthUnselected.
 
 Other changes:
 
@@ -63,6 +64,13 @@ Other changes:
   to not leak the value into a subsequent window. (#8196)
 - Tables: fixed an issue where Columns Visible/Hidden state wouldn't be correctly
   overridden when hot-reloading .ini state. (#7934)
+- Styles, Tabs: made the Close Button of selected tabs always visible by default,
+  without requiring to hover the tab. (#8387)
+  - Added style.TabCloseButtonMinWidthSelected/TabCloseButtonMinWidthUnselected settings
+    to configure visibility of the Close Button for selected and unselected tabs.
+    (-1: always visible. 0.0f: visible when hovered. >0.0f: visible when hovered if minimum width)
+  - Default for selected tabs: TabCloseButtonMinWidthSelected = -1.0f (always visible)
+  - Default for unselected tabs: TabCloseButtonMinWidthUnselected = 0.0f (visible when hovered)
 - TextLinkOpenURL(): fixed default Win32 io.PlatformOpenInShellFn handler to
   handle UTF-8 regardless of system regional settings. (#7660) [@achabense]
 - Demo: Combos: demonstrate a very simple way to add a filter to a combo,

imgui.cpp

@@ -1339,7 +1339,8 @@ ImGuiStyle::ImGuiStyle()
     LogSliderDeadzone           = 4.0f;             // The size in pixels of the dead-zone around zero on logarithmic sliders that cross zero.
     TabRounding                 = 5.0f;             // Radius of upper corners of a tab. Set to 0.0f to have rectangular tabs.
     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.
+    TabCloseButtonMinWidthSelected   = -1.0f;       // -1: always visible. 0.0f: visible when hovered. >0.0f: visible when hovered if minimum width.
+    TabCloseButtonMinWidthUnselected = 0.0f;        // -1: always visible. 0.0f: visible when hovered. >0.0f: visible when hovered if minimum width. FLT_MAX: never show close button when unselected.
     TabBarBorderSize            = 1.0f;             // Thickness of tab-bar separator, which takes on the tab active color to denote focus.
     TabBarOverlineSize          = 1.0f;             // 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).
@@ -1394,7 +1395,8 @@ void ImGuiStyle::ScaleAllSizes(float scale_factor)
     GrabRounding = ImTrunc(GrabRounding * scale_factor);
     LogSliderDeadzone = ImTrunc(LogSliderDeadzone * scale_factor);
     TabRounding = ImTrunc(TabRounding * scale_factor);
-    TabMinWidthForCloseButton = (TabMinWidthForCloseButton != FLT_MAX) ? ImTrunc(TabMinWidthForCloseButton * scale_factor) : FLT_MAX;
+    TabCloseButtonMinWidthSelected = (TabCloseButtonMinWidthSelected > 0.0f && TabCloseButtonMinWidthSelected != FLT_MAX) ? ImTrunc(TabCloseButtonMinWidthSelected * scale_factor) : FLT_MAX;
+    TabCloseButtonMinWidthUnselected = (TabCloseButtonMinWidthUnselected > 0.0f && TabCloseButtonMinWidthUnselected != FLT_MAX) ? ImTrunc(TabCloseButtonMinWidthUnselected * scale_factor) : FLT_MAX;
     TabBarOverlineSize = ImTrunc(TabBarOverlineSize * scale_factor);
     SeparatorTextPadding = ImTrunc(SeparatorTextPadding * scale_factor);
     DisplayWindowPadding = ImTrunc(DisplayWindowPadding * scale_factor);

imgui.h

@@ -2170,7 +2170,8 @@ struct ImGuiStyle
     float       LogSliderDeadzone;          // The size in pixels of the dead-zone around zero on logarithmic sliders that cross zero.
     float       TabRounding;                // Radius of upper corners of a tab. Set to 0.0f to have rectangular tabs.
     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       TabCloseButtonMinWidthSelected;     // -1: always visible. 0.0f: visible when hovered. >0.0f: visible when hovered if minimum width.
+    float       TabCloseButtonMinWidthUnselected;   // -1: always visible. 0.0f: visible when hovered. >0.0f: visible when hovered if minimum width. FLT_MAX: never show close button when unselected.
     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).
@@ -2201,6 +2202,11 @@ struct ImGuiStyle
 
     IMGUI_API ImGuiStyle();
     IMGUI_API void ScaleAllSizes(float scale_factor);
+
+    // Obsolete names
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    // TabMinWidthForCloseButton = TabCloseButtonMinWidthUnselected // Renamed in 1.91.9.
+#endif
 };
 
 //-----------------------------------------------------------------------------

imgui_demo.cpp

@@ -7991,10 +7991,6 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             ImGui::SliderFloat("ChildBorderSize", &style.ChildBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::SliderFloat("PopupBorderSize", &style.PopupBorderSize, 0.0f, 1.0f, "%.0f");
             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, 3.0f, "%.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");
@@ -8003,6 +7999,14 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             ImGui::SliderFloat("PopupRounding", &style.PopupRounding, 0.0f, 12.0f, "%.0f");
             ImGui::SliderFloat("ScrollbarRounding", &style.ScrollbarRounding, 0.0f, 12.0f, "%.0f");
             ImGui::SliderFloat("GrabRounding", &style.GrabRounding, 0.0f, 12.0f, "%.0f");
+
+            ImGui::SeparatorText("Tabs");
+            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, 3.0f, "%.0f");
+            ImGui::SameLine(); HelpMarker("Overline is only drawn over the selected tab when ImGuiTabBarFlags_DrawSelectedOverline is set.");
+            ImGui::DragFloat("TabCloseButtonMinWidthSelected", &style.TabCloseButtonMinWidthSelected, 0.1f, -1.0f, 100.0f, (style.TabCloseButtonMinWidthSelected < 0.0f) ? "%.0f (Always)" : "%.0f");
+            ImGui::DragFloat("TabCloseButtonMinWidthUnselected", &style.TabCloseButtonMinWidthUnselected, 0.1f, -1.0f, 100.0f, (style.TabCloseButtonMinWidthUnselected < 0.0f) ? "%.0f (Always)" : "%.0f");
             ImGui::SliderFloat("TabRounding", &style.TabRounding, 0.0f, 12.0f, "%.0f");
 
             ImGui::SeparatorText("Tables");

imgui_widgets.cpp

@@ -10369,9 +10369,13 @@ void ImGui::TabItemLabelAndCloseButton(ImDrawList* draw_list, const ImRect& bb,
     bool close_button_pressed = false;
     bool close_button_visible = false;
     if (close_button_id != 0)
-        if (is_contents_visible || bb.GetWidth() >= ImMax(button_sz, g.Style.TabMinWidthForCloseButton))
-            if (g.HoveredId == tab_id || g.HoveredId == close_button_id || g.ActiveId == tab_id || g.ActiveId == close_button_id)
-                close_button_visible = true;
+    {
+        bool is_hovered = g.HoveredId == tab_id || g.HoveredId == close_button_id || g.ActiveId == tab_id || g.ActiveId == close_button_id; // Any interaction account for this too.
+        if (is_contents_visible)
+            close_button_visible = (g.Style.TabCloseButtonMinWidthSelected < 0.0f) ? true : (is_hovered && bb.GetWidth() >= ImMax(button_sz, g.Style.TabCloseButtonMinWidthSelected));
+        else
+            close_button_visible = (g.Style.TabCloseButtonMinWidthUnselected < 0.0f) ? true : (is_hovered && bb.GetWidth() >= ImMax(button_sz, g.Style.TabCloseButtonMinWidthUnselected));
+    }
     bool unsaved_marker_visible = (flags & ImGuiTabItemFlags_UnsavedDocument) != 0 && (button_pos.x + button_sz <= bb.Max.x);
 
     if (close_button_visible)