Added SetNextItemWidth() helper to avoid using PushItemWidth/PopItemWidth() for single items.

docs/CHANGELOG.txt

@@ -46,6 +46,10 @@ Other Changes:
 - InputText: Work-around for buggy standard libraries where isprint('\t') returns true. (#2467, #1336)
 - InputText: Fixed ImGuiInputTextFlags_AllowTabInput leading to two tabs characters being inserted
   if the back-end provided both Key and Character input. (#2467, #1336)
+- Added SetNextItemWidth() helper to avoid using PushItemWidth/PopItemWidth() for single items.
+  Note that SetNextItemWidth() currently only affect the same subset of items as PushItemWidth(),
+  generally referred to as the large framed+labeled items.
+  Because the new SetNextItemWidth() function is explicit
 - GetMouseDragDelta(): also returns the delta on the mouse button released frame. (#2419)
 - GetMouseDragDelta(): verify that mouse positions are valid otherwise returns zero.
 - Inputs: Also add support for horizontal scroll with Shift+Mouse Wheel. (#2424, #1463) [@LucaRood]

imgui.cpp

@@ -2068,10 +2068,8 @@ ImGuiTextFilter::ImGuiTextFilter(const char* default_filter)
 bool ImGuiTextFilter::Draw(const char* label, float width)
 {
     if (width != 0.0f)
-        ImGui::PushItemWidth(width);
+        ImGui::SetNextItemWidth(width);
     bool value_changed = ImGui::InputText(label, InputBuf, IM_ARRAYSIZE(InputBuf));
-    if (width != 0.0f)
-        ImGui::PopItemWidth();
     if (value_changed)
         Build();
     return value_changed;
@@ -5744,6 +5742,12 @@ void ImGui::FocusPreviousWindowIgnoringOne(ImGuiWindow* ignore_window)
     }
 }
 
+void ImGui::SetNextItemWidth(float item_width)
+{
+    ImGuiWindow* window = GetCurrentWindow();
+    window->DC.NextItemWidth = item_width;
+}
+
 void ImGui::PushItemWidth(float item_width)
 {
     ImGuiWindow* window = GetCurrentWindow();
@@ -5755,8 +5759,6 @@ void ImGui::PushMultiItemsWidths(int components, float w_full)
 {
     ImGuiWindow* window = GetCurrentWindow();
     const ImGuiStyle& style = GImGui->Style;
-    if (w_full <= 0.0f)
-        w_full = CalcItemWidth();
     const float w_item_one  = ImMax(1.0f, (float)(int)((w_full - (style.ItemInnerSpacing.x) * (components-1)) / (float)components));
     const float w_item_last = ImMax(1.0f, (float)(int)(w_full - (w_item_one + style.ItemInnerSpacing.x) * (components-1)));
     window->DC.ItemWidthStack.push_back(w_item_last);
@@ -5772,11 +5774,21 @@ void ImGui::PopItemWidth()
     window->DC.ItemWidth = window->DC.ItemWidthStack.empty() ? window->ItemWidthDefault : window->DC.ItemWidthStack.back();
 }
 
-// Calculate default item width given value passed to PushItemWidth()
+// Calculate default item width given value passed to PushItemWidth() or SetNextItemWidth(),
-float ImGui::CalcItemWidth()
+// Then consume the 
+float ImGui::GetNextItemWidth()
 {
     ImGuiWindow* window = GImGui->CurrentWindow;
-    float w = window->DC.ItemWidth;
+    float w;
+    if (window->DC.NextItemWidth != FLT_MAX)
+    {
+        w = window->DC.NextItemWidth;
+        window->DC.NextItemWidth = FLT_MAX;
+    }
+    else
+    {
+        w = window->DC.ItemWidth;
+    }
     if (w < 0.0f)
     {
         float region_max_x = GetContentRegionMaxScreen().x;
@@ -5786,10 +5798,21 @@ float ImGui::CalcItemWidth()
     return w;
 }
 
-// [Internal] Calculate full item size given user provided 'size' parameter and default width/height. Default width is often == CalcItemWidth().
+// Calculate item width *without* popping/consuming NextItemWidth if it was set.
+// (rarely used, which is why we avoid calling this from GetNextItemWidth() and instead do a backup/restore here)
+float ImGui::CalcItemWidth()
+{
+    ImGuiWindow* window = GImGui->CurrentWindow;
+    float backup_next_item_width = window->DC.NextItemWidth;
+    float w = GetNextItemWidth();
+    window->DC.NextItemWidth = backup_next_item_width;
+    return w;
+}
+
+// [Internal] Calculate full item size given user provided 'size' parameter and default width/height. Default width is often == GetNextItemWidth().
 // Those two functions CalcItemWidth vs CalcItemSize are awkwardly named because they are not fully symmetrical.
 // Note that only CalcItemWidth() is publicly exposed.
-// The 4.0f here may be changed to match CalcItemWidth() and/or BeginChild() (right now we have a mismatch which is harmless but undesirable)
+// The 4.0f here may be changed to match GetNextItemWidth() and/or BeginChild() (right now we have a mismatch which is harmless but undesirable)
 ImVec2 ImGui::CalcItemSize(ImVec2 size, float default_w, float default_h)
 {
     ImGuiWindow* window = GImGui->CurrentWindow;
@@ -9147,11 +9170,10 @@ void ImGui::LogButtons()
     const bool log_to_tty = Button("Log To TTY"); SameLine();
     const bool log_to_file = Button("Log To File"); SameLine();
     const bool log_to_clipboard = Button("Log To Clipboard"); SameLine();
-    PushItemWidth(80.0f);
     PushAllowKeyboardFocus(false);
+    SetNextItemWidth(80.0f);
     SliderInt("Default Depth", &g.LogDepthToExpandDefault, 0, 9, NULL);
     PopAllowKeyboardFocus();
-    PopItemWidth();
     PopID();
 
     // Start logging at the end of the function so that the buttons don't appear in the log
@@ -9739,9 +9761,8 @@ void ImGui::ShowMetricsWindow(bool* p_open)
         ImGui::Checkbox("Show windows begin order", &show_windows_begin_order);
         ImGui::Checkbox("Show windows rectangles", &show_windows_rects);
         ImGui::SameLine();
-        ImGui::PushItemWidth(ImGui::GetFontSize() * 12);
+        ImGui::SetNextItemWidth(ImGui::GetFontSize() * 12);
         show_windows_rects |= ImGui::Combo("##rects_type", &show_windows_rect_type, "OuterRect\0" "OuterRectClipped\0" "InnerMainRect\0" "InnerClipRect\0" "ContentsRegionRect\0");
-        ImGui::PopItemWidth();
         ImGui::Checkbox("Show clipping rectangle when hovering ImDrawCmd node", &show_drawcmd_clip_rects);
         ImGui::TreePop();
     }

imgui.h

@@ -321,8 +321,9 @@ namespace ImGui
     IMGUI_API ImU32         GetColorU32(ImU32 col);                                         // retrieve given color with style alpha applied
 
     // Parameters stacks (current window)
-    IMGUI_API void          PushItemWidth(float item_width);                                // width of items for the common item+label case, pixels. 0.0f = default to ~2/3 of windows width, >0.0f: width in pixels, <0.0f align xx pixels to the right of window (so -1.0f always align width to the right side)
+    IMGUI_API void          PushItemWidth(float item_width);                                // set width of items for common large "item+label" widgets. >0.0f: width in pixels, <0.0f align xx pixels to the right of window (so -1.0f always align width to the right side). 0.0f = default to ~2/3 of windows width, 
     IMGUI_API void          PopItemWidth();
+    IMGUI_API void          SetNextItemWidth(float item_width);                             // set width of the _next_ common large "item+label" widget. >0.0f: width in pixels, <0.0f align xx pixels to the right of window (so -1.0f always align width to the right side)
     IMGUI_API float         CalcItemWidth();                                                // width of item given pushed settings and current cursor position
     IMGUI_API void          PushTextWrapPos(float wrap_local_pos_x = 0.0f);                 // word-wrapping for Text*() commands. < 0.0f: no wrapping; 0.0f: wrap to end of window (or column); > 0.0f: wrap at 'wrap_pos_x' position in window local space
     IMGUI_API void          PopTextWrapPos();

imgui_demo.cpp

@@ -550,9 +550,8 @@ static void ShowDemoWindowWidgets()
             ImGui::ListBox("listbox\n(single select)", &listbox_item_current, listbox_items, IM_ARRAYSIZE(listbox_items), 4);
 
             //static int listbox_item_current2 = 2;
-            //ImGui::PushItemWidth(-1);
+            //ImGui::SetNextItemWidth(-1);
             //ImGui::ListBox("##listbox2", &listbox_item_current2, listbox_items, IM_ARRAYSIZE(listbox_items), 4);
-            //ImGui::PopItemWidth();
         }
 
         ImGui::TreePop();
@@ -1052,7 +1051,8 @@ static void ShowDemoWindowWidgets()
         };
         static int func_type = 0, display_count = 70;
         ImGui::Separator();
-        ImGui::PushItemWidth(100); ImGui::Combo("func", &func_type, "Sin\0Saw\0"); ImGui::PopItemWidth();
+        ImGui::SetNextItemWidth(100);
+        ImGui::Combo("func", &func_type, "Sin\0Saw\0");
         ImGui::SameLine();
         ImGui::SliderInt("Sample count", &display_count, 1, 400);
         float (*func)(void*, int) = (func_type == 0) ? Funcs::Sin : Funcs::Saw;
@@ -1667,9 +1667,8 @@ static void ShowDemoWindowLayout()
         static int line = 50;
         bool goto_line = ImGui::Button("Goto");
         ImGui::SameLine();
-        ImGui::PushItemWidth(100);
+        ImGui::SetNextItemWidth(100);
         goto_line |= ImGui::InputInt("##Line", &line, 0, 0, ImGuiInputTextFlags_EnterReturnsTrue);
-        ImGui::PopItemWidth();
 
         // Child 1: no border, enable horizontal scrollbar
         {
@@ -1740,35 +1739,36 @@ static void ShowDemoWindowLayout()
 
     if (ImGui::TreeNode("Widgets Width"))
     {
+        // Use SetNextItemWidth() to set the width of a single upcoming item.
+        // Use PushItemWidth()/PopItemWidth() to set the width of a group of items.
         static float f = 0.0f;
-        ImGui::Text("PushItemWidth(100)");
+        ImGui::Text("SetNextItemWidth/PushItemWidth(100)");
         ImGui::SameLine(); HelpMarker("Fixed width.");
-        ImGui::PushItemWidth(100);
+        ImGui::SetNextItemWidth(100);
         ImGui::DragFloat("float##1", &f);
-        ImGui::PopItemWidth();
 
-        ImGui::Text("PushItemWidth(GetWindowWidth() * 0.5f)");
+        ImGui::Text("SetNextItemWidth/PushItemWidth(GetWindowWidth() * 0.5f)");
         ImGui::SameLine(); HelpMarker("Half of window width.");
-        ImGui::PushItemWidth(ImGui::GetWindowWidth() * 0.5f);
+        ImGui::SetNextItemWidth(ImGui::GetWindowWidth() * 0.5f);
         ImGui::DragFloat("float##2", &f);
-        ImGui::PopItemWidth();
 
-        ImGui::Text("PushItemWidth(GetContentRegionAvailWidth() * 0.5f)");
+        ImGui::Text("SetNextItemWidth/PushItemWidth(GetContentRegionAvailWidth() * 0.5f)");
         ImGui::SameLine(); HelpMarker("Half of available width.\n(~ right-cursor_pos)\n(works within a column set)");
-        ImGui::PushItemWidth(ImGui::GetContentRegionAvailWidth() * 0.5f);
+        ImGui::SetNextItemWidth(ImGui::GetContentRegionAvailWidth() * 0.5f);
         ImGui::DragFloat("float##3", &f);
-        ImGui::PopItemWidth();
 
-        ImGui::Text("PushItemWidth(-100)");
+        ImGui::Text("SetNextItemWidth/PushItemWidth(-100)");
         ImGui::SameLine(); HelpMarker("Align to right edge minus 100");
-        ImGui::PushItemWidth(-100);
+        ImGui::SetNextItemWidth(-100);
         ImGui::DragFloat("float##4", &f);
-        ImGui::PopItemWidth();
 
-        ImGui::Text("PushItemWidth(-1)");
+        // Demonstrate using PushItemWidth to surround three items. Calling SetNextItemWidth() before each of them would have the same effect.
+        ImGui::Text("SetNextItemWidth/PushItemWidth(-1)");
         ImGui::SameLine(); HelpMarker("Align to right edge");
         ImGui::PushItemWidth(-1);
-        ImGui::DragFloat("float##5", &f);
+        ImGui::DragFloat("float##5a", &f);
+        ImGui::DragFloat("float##5b", &f);
+        ImGui::DragFloat("float##5c", &f);
         ImGui::PopItemWidth();
 
         ImGui::TreePop();
@@ -2241,9 +2241,8 @@ static void ShowDemoWindowPopups()
         {
             if (ImGui::Selectable("Set to zero")) value = 0.0f;
             if (ImGui::Selectable("Set to PI")) value = 3.1415f;
-            ImGui::PushItemWidth(-1);
+            ImGui::SetNextItemWidth(-1);
             ImGui::DragFloat("##Value", &value, 0.1f, 0.0f, 0.0f);
-            ImGui::PopItemWidth();
             ImGui::EndPopup();
         }
 
@@ -2968,7 +2967,7 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
                 }
                 ImGui::LogFinish();
             }
-            ImGui::SameLine(); ImGui::PushItemWidth(120); ImGui::Combo("##output_type", &output_dest, "To Clipboard\0To TTY\0"); ImGui::PopItemWidth();
+            ImGui::SameLine(); ImGui::SetNextItemWidth(120); ImGui::Combo("##output_type", &output_dest, "To Clipboard\0To TTY\0");
             ImGui::SameLine(); ImGui::Checkbox("Only Modified Colors", &output_only_modified);
 
             static ImGuiTextFilter filter;
@@ -3807,12 +3806,11 @@ static void ShowExampleAppPropertyEditor(bool* p_open)
                         ImGui::AlignTextToFramePadding();
                         ImGui::TreeNodeEx("Field", ImGuiTreeNodeFlags_Leaf | ImGuiTreeNodeFlags_NoTreePushOnOpen | ImGuiTreeNodeFlags_Bullet, "Field_%d", i);
                         ImGui::NextColumn();
-                        ImGui::PushItemWidth(-1);
+                        ImGui::SetNextItemWidth(-1);
                         if (i >= 5)
                             ImGui::InputFloat("##value", &dummy_members[i], 1.0f);
                         else
                             ImGui::DragFloat("##value", &dummy_members[i], 0.01f);
-                        ImGui::PopItemWidth();
                         ImGui::NextColumn();
                     }
                     ImGui::PopID();
@@ -3952,10 +3950,10 @@ static void ShowExampleAppConstrainedResize(bool* p_open)
         if (ImGui::Button("200x200")) { ImGui::SetWindowSize(ImVec2(200, 200)); } ImGui::SameLine();
         if (ImGui::Button("500x500")) { ImGui::SetWindowSize(ImVec2(500, 500)); } ImGui::SameLine();
         if (ImGui::Button("800x200")) { ImGui::SetWindowSize(ImVec2(800, 200)); }
-        ImGui::PushItemWidth(200);
+        ImGui::SetNextItemWidth(200);
         ImGui::Combo("Constraint", &type, desc, IM_ARRAYSIZE(desc));
+        ImGui::SetNextItemWidth(200);
         ImGui::DragInt("Lines", &display_lines, 0.2f, 1, 100);
-        ImGui::PopItemWidth();
         ImGui::Checkbox("Auto-resize", &auto_resize);
         for (int i = 0; i < display_lines; i++)
             ImGui::Text("%*sHello, sailor! Making this line long enough for the example.", i * 4, "");
@@ -4401,7 +4399,7 @@ void ShowExampleAppDocuments(bool* p_open)
             if (ImGui::BeginPopupModal("Save?"))
             {
                 ImGui::Text("Save change to the following items?");
-                ImGui::PushItemWidth(-1.0f);
+                ImGui::SetNextItemWidth(-1.0f);
                 if (ImGui::ListBoxHeader("##", close_queue_unsaved_documents, 6))
                 {
                     for (int n = 0; n < close_queue.Size; n++)

imgui_internal.h

@@ -1146,6 +1146,7 @@ struct IMGUI_API ImGuiWindowTempData
     // We store the current settings outside of the vectors to increase memory locality (reduce cache misses). The vectors are rarely modified. Also it allows us to not heap allocate for short-lived windows which are not using those settings.
     ImGuiItemFlags          ItemFlags;              // == ItemFlagsStack.back() [empty == ImGuiItemFlags_Default]
     float                   ItemWidth;              // == ItemWidthStack.back(). 0.0: default, >0.0: width in pixels, <0.0: align xx pixels to the right of window
+    float                   NextItemWidth;
     float                   TextWrapPos;            // == TextWrapPosStack.back() [empty == -1.0f]
     ImVector<ImGuiItemFlags>ItemFlagsStack;
     ImVector<float>         ItemWidthStack;
@@ -1181,6 +1182,7 @@ struct IMGUI_API ImGuiWindowTempData
 
         ItemFlags = ImGuiItemFlags_Default_;
         ItemWidth = 0.0f;
+        NextItemWidth = +FLT_MAX;
         TextWrapPos = -1.0f;
         memset(StackSizesBackup, 0, sizeof(StackSizesBackup));
 
@@ -1438,9 +1440,10 @@ namespace ImGui
     IMGUI_API bool          IsClippedEx(const ImRect& bb, ImGuiID id, bool clip_even_when_logged);
     IMGUI_API bool          FocusableItemRegister(ImGuiWindow* window, ImGuiID id);   // Return true if focus is requested
     IMGUI_API void          FocusableItemUnregister(ImGuiWindow* window);
+    IMGUI_API float         GetNextItemWidth();
     IMGUI_API ImVec2        CalcItemSize(ImVec2 size, float default_w, float default_h);
     IMGUI_API float         CalcWrapWidthForPos(const ImVec2& pos, float wrap_pos_x);
-    IMGUI_API void          PushMultiItemsWidths(int components, float width_full = 0.0f);
+    IMGUI_API void          PushMultiItemsWidths(int components, float width_full);
     IMGUI_API void          PushItemFlag(ImGuiItemFlags option, bool enabled);
     IMGUI_API void          PopItemFlag();
     IMGUI_API bool          IsItemToggledSelection();                                           // was the last item selection toggled? (after Selectable(), TreeNode() etc. We only returns toggle _event_ in order to handle clipping correctly)

imgui_widgets.cpp

@@ -325,7 +325,7 @@ void ImGui::LabelTextV(const char* label, const char* fmt, va_list args)
 
     ImGuiContext& g = *GImGui;
     const ImGuiStyle& style = g.Style;
-    const float w = CalcItemWidth();
+    const float w = GetNextItemWidth();
 
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
     const ImRect value_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y*2));
@@ -1089,7 +1089,7 @@ void ImGui::ProgressBar(float fraction, const ImVec2& size_arg, const char* over
     const ImGuiStyle& style = g.Style;
 
     ImVec2 pos = window->DC.CursorPos;
-    ImVec2 size = CalcItemSize(size_arg, CalcItemWidth(), g.FontSize + style.FramePadding.y*2.0f);
+    ImVec2 size = CalcItemSize(size_arg, GetNextItemWidth(), g.FontSize + style.FramePadding.y*2.0f);
     ImRect bb(pos, pos + size);
     ItemSize(size, style.FramePadding.y);
     if (!ItemAdd(bb, 0))
@@ -1353,7 +1353,8 @@ bool ImGui::BeginCombo(const char* label, const char* preview_value, ImGuiComboF
 
     const float arrow_size = (flags & ImGuiComboFlags_NoArrowButton) ? 0.0f : GetFrameHeight();
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
-    const float w = (flags & ImGuiComboFlags_NoPreview) ? arrow_size : CalcItemWidth();
+    const float expected_w = GetNextItemWidth();
+    const float w = (flags & ImGuiComboFlags_NoPreview) ? arrow_size : expected_w;
     const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y*2.0f));
     const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0.0f));
     ItemSize(total_bb, style.FramePadding.y);
@@ -1978,7 +1979,7 @@ bool ImGui::DragScalar(const char* label, ImGuiDataType data_type, void* v, floa
     ImGuiContext& g = *GImGui;
     const ImGuiStyle& style = g.Style;
     const ImGuiID id = window->GetID(label);
-    const float w = CalcItemWidth();
+    const float w = GetNextItemWidth();
 
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
     const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y*2.0f));
@@ -2052,7 +2053,7 @@ bool ImGui::DragScalarN(const char* label, ImGuiDataType data_type, void* v, int
     bool value_changed = false;
     BeginGroup();
     PushID(label);
-    PushMultiItemsWidths(components);
+    PushMultiItemsWidths(components, GetNextItemWidth());
     size_t type_size = GDataTypeInfo[data_type].Size;
     for (int i = 0; i < components; i++)
     {
@@ -2099,7 +2100,7 @@ bool ImGui::DragFloatRange2(const char* label, float* v_current_min, float* v_cu
     ImGuiContext& g = *GImGui;
     PushID(label);
     BeginGroup();
-    PushMultiItemsWidths(2);
+    PushMultiItemsWidths(2, GetNextItemWidth());
 
     bool value_changed = DragFloat("##min", v_current_min, v_speed, (v_min >= v_max) ? -FLT_MAX : v_min, (v_min >= v_max) ? *v_current_max : ImMin(v_max, *v_current_max), format, power);
     PopItemWidth();
@@ -2144,7 +2145,7 @@ bool ImGui::DragIntRange2(const char* label, int* v_current_min, int* v_current_
     ImGuiContext& g = *GImGui;
     PushID(label);
     BeginGroup();
-    PushMultiItemsWidths(2);
+    PushMultiItemsWidths(2, GetNextItemWidth());
 
     bool value_changed = DragInt("##min", v_current_min, v_speed, (v_min >= v_max) ? INT_MIN : v_min, (v_min >= v_max) ? *v_current_max : ImMin(v_max, *v_current_max), format);
     PopItemWidth();
@@ -2422,7 +2423,7 @@ bool ImGui::SliderScalar(const char* label, ImGuiDataType data_type, void* v, co
     ImGuiContext& g = *GImGui;
     const ImGuiStyle& style = g.Style;
     const ImGuiID id = window->GetID(label);
-    const float w = CalcItemWidth();
+    const float w = GetNextItemWidth();
 
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
     const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y*2.0f));
@@ -2501,7 +2502,7 @@ bool ImGui::SliderScalarN(const char* label, ImGuiDataType data_type, void* v, i
     bool value_changed = false;
     BeginGroup();
     PushID(label);
-    PushMultiItemsWidths(components);
+    PushMultiItemsWidths(components, GetNextItemWidth());
     size_t type_size = GDataTypeInfo[data_type].Size;
     for (int i = 0; i < components; i++)
     {
@@ -2790,10 +2791,9 @@ bool ImGui::InputScalar(const char* label, ImGuiDataType data_type, void* data_p
 
         BeginGroup(); // The only purpose of the group here is to allow the caller to query item data e.g. IsItemActive()
         PushID(label);
-        PushItemWidth(ImMax(1.0f, CalcItemWidth() - (button_size + style.ItemInnerSpacing.x) * 2));
+        SetNextItemWidth(ImMax(1.0f, GetNextItemWidth() - (button_size + style.ItemInnerSpacing.x) * 2));
         if (InputText("", buf, IM_ARRAYSIZE(buf), flags)) // PushId(label) + "" gives us the expected ID from outside point of view
             value_changed = DataTypeApplyOpFromText(buf, g.InputTextState.InitialTextA.Data, data_type, data_ptr, format);
-        PopItemWidth();
 
         // Step buttons
         const ImVec2 backup_frame_padding = style.FramePadding;
@@ -2839,7 +2839,7 @@ bool ImGui::InputScalarN(const char* label, ImGuiDataType data_type, void* v, in
     bool value_changed = false;
     BeginGroup();
     PushID(label);
-    PushMultiItemsWidths(components);
+    PushMultiItemsWidths(components, GetNextItemWidth());
     size_t type_size = GDataTypeInfo[data_type].Size;
     for (int i = 0; i < components; i++)
     {
@@ -3289,7 +3289,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
         BeginGroup();
     const ImGuiID id = window->GetID(label);
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
-    ImVec2 size = CalcItemSize(size_arg, CalcItemWidth(), (is_multiline ? GetTextLineHeight() * 8.0f : label_size.y) + style.FramePadding.y*2.0f); // Arbitrary default of 8 lines high for multi-line
+    ImVec2 size = CalcItemSize(size_arg, GetNextItemWidth(), (is_multiline ? GetTextLineHeight() * 8.0f : label_size.y) + style.FramePadding.y*2.0f); // Arbitrary default of 8 lines high for multi-line
     const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + size);
     const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? (style.ItemInnerSpacing.x + label_size.x) : 0.0f, 0.0f));
 
@@ -4047,7 +4047,7 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
     const ImGuiStyle& style = g.Style;
     const float square_sz = GetFrameHeight();
     const float w_extra = (flags & ImGuiColorEditFlags_NoSmallPreview) ? 0.0f : (square_sz + style.ItemInnerSpacing.x);
-    const float w_items_all = CalcItemWidth() - w_extra;
+    const float w_items_all = GetNextItemWidth() - w_extra;
     const char* label_display_end = FindRenderedTextEnd(label);
 
     BeginGroup();
@@ -4112,13 +4112,11 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
         };
         const int fmt_idx = hide_prefix ? 0 : (flags & ImGuiColorEditFlags_DisplayHSV) ? 2 : 1;
 
-        PushItemWidth(w_item_one);
         for (int n = 0; n < components; n++)
         {
             if (n > 0)
                 SameLine(0, style.ItemInnerSpacing.x);
-            if (n + 1 == components)
+            SetNextItemWidth((n + 1 < components) ? w_item_one : w_item_last);
-                PushItemWidth(w_item_last);
             if (flags & ImGuiColorEditFlags_Float)
             {
                 value_changed |= DragFloat(ids[n], &f[n], 1.0f/255.0f, 0.0f, hdr ? 0.0f : 1.0f, fmt_table_float[fmt_idx][n]);
@@ -4131,8 +4129,6 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
             if (!(flags & ImGuiColorEditFlags_NoOptions))
                 OpenPopupOnItemClick("context");
         }
-        PopItemWidth();
-        PopItemWidth();
     }
     else if ((flags & ImGuiColorEditFlags_DisplayHex) != 0 && (flags & ImGuiColorEditFlags_NoInputs) == 0)
     {
@@ -4142,7 +4138,7 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
             ImFormatString(buf, IM_ARRAYSIZE(buf), "#%02X%02X%02X%02X", ImClamp(i[0],0,255), ImClamp(i[1],0,255), ImClamp(i[2],0,255), ImClamp(i[3],0,255));
         else
             ImFormatString(buf, IM_ARRAYSIZE(buf), "#%02X%02X%02X", ImClamp(i[0],0,255), ImClamp(i[1],0,255), ImClamp(i[2],0,255));
-        PushItemWidth(w_items_all);
+        SetNextItemWidth(w_items_all);
         if (InputText("##Text", buf, IM_ARRAYSIZE(buf), ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_CharsUppercase))
         {
             value_changed = true;
@@ -4157,7 +4153,6 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
         }
         if (!(flags & ImGuiColorEditFlags_NoOptions))
             OpenPopupOnItemClick("context");
-        PopItemWidth();
     }
 
     ImGuiWindow* picker_active_window = NULL;
@@ -4190,9 +4185,8 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
             }
             ImGuiColorEditFlags picker_flags_to_forward = ImGuiColorEditFlags__DataTypeMask | ImGuiColorEditFlags__PickerMask | ImGuiColorEditFlags__InputMask | ImGuiColorEditFlags_HDR | ImGuiColorEditFlags_NoAlpha | ImGuiColorEditFlags_AlphaBar;
             ImGuiColorEditFlags picker_flags = (flags_untouched & picker_flags_to_forward) | ImGuiColorEditFlags_DisplayHSV | ImGuiColorEditFlags_NoLabel | ImGuiColorEditFlags_AlphaPreviewHalf;
-            PushItemWidth(square_sz * 12.0f); // Use 256 + bar sizes?
+            SetNextItemWidth(square_sz * 12.0f); // Use 256 + bar sizes?
             value_changed |= ColorPicker4("##picker", col, picker_flags, &g.ColorPickerRef.x);
-            PopItemWidth();
             EndPopup();
         }
     }
@@ -4360,7 +4354,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
     ImVec2 picker_pos = window->DC.CursorPos;
     float square_sz = GetFrameHeight();
     float bars_width = square_sz; // Arbitrary smallish width of Hue/Alpha picking bars
-    float sv_picker_size = ImMax(bars_width * 1, CalcItemWidth() - (alpha_bar ? 2 : 1) * (bars_width + style.ItemInnerSpacing.x)); // Saturation/Value picking box
+    float sv_picker_size = ImMax(bars_width * 1, GetNextItemWidth() - (alpha_bar ? 2 : 1) * (bars_width + style.ItemInnerSpacing.x)); // Saturation/Value picking box
     float bar0_pos_x = picker_pos.x + sv_picker_size + style.ItemInnerSpacing.x;
     float bar1_pos_x = bar0_pos_x + bars_width + style.ItemInnerSpacing.x;
     float bars_triangles_half_sz = (float)(int)(bars_width * 0.20f);
@@ -5458,7 +5452,7 @@ bool ImGui::ListBoxHeader(const char* label, const ImVec2& size_arg)
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
 
     // Size default to hold ~7 items. Fractional number of items helps seeing that we can scroll down/up without looking at scrollbar.
-    ImVec2 size = CalcItemSize(size_arg, CalcItemWidth(), GetTextLineHeightWithSpacing() * 7.4f + style.ItemSpacing.y);
+    ImVec2 size = CalcItemSize(size_arg, GetNextItemWidth(), GetTextLineHeightWithSpacing() * 7.4f + style.ItemSpacing.y);
     ImVec2 frame_size = ImVec2(size.x, ImMax(size.y, label_size.y));
     ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + frame_size);
     ImRect bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0.0f));
@@ -5575,7 +5569,7 @@ void ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_ge
 
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
     if (frame_size.x == 0.0f)
-        frame_size.x = CalcItemWidth();
+        frame_size.x = GetNextItemWidth();
     if (frame_size.y == 0.0f)
         frame_size.y = label_size.y + (style.FramePadding.y * 2);