Added GetContentRegionAvailWidth() helper. Demo tweaks.

imgui.cpp

@@ -4550,6 +4550,11 @@ ImVec2 ImGui::GetContentRegionAvail()
     return GetContentRegionMax() - (window->DC.CursorPos - window->Pos);
 }
 
+float ImGui::GetContentRegionAvailWidth()
+{
+    return GetContentRegionAvail().x;
+}
+
 // In window space (not screen space!)
 ImVec2 ImGui::GetWindowContentRegionMin()
 {

imgui.h

@@ -124,6 +124,7 @@ namespace ImGui
     IMGUI_API ImVec2        GetContentRegionAvail();                                            // == GetContentRegionMax() - GetCursorPos()
     IMGUI_API ImVec2        GetWindowContentRegionMin();                                        // window boundaries, in windows coordinates
     IMGUI_API ImVec2        GetWindowContentRegionMax();
+    IMGUI_API float         GetContentRegionAvailWidth();                                       //
     IMGUI_API ImDrawList*   GetWindowDrawList();                                                // get rendering command-list if you want to append your own draw primitives
     IMGUI_API ImFont*       GetWindowFont();
     IMGUI_API float         GetWindowFontSize();                                                // size (also height in pixels) of current font with current scale applied

imgui_demo.cpp

@@ -735,21 +735,26 @@ void ImGui::ShowTestWindow(bool* opened)
         if (ImGui::TreeNode("Widgets Alignment"))
         {
             static float f = 0.0f;
-            ImGui::Text("Fixed: 100 pixels");
+            ImGui::Text("PushItemWidth(100)");
             ImGui::PushItemWidth(100);
             ImGui::InputFloat("float##1", &f);
             ImGui::PopItemWidth();
 
-            ImGui::Text("Proportional: 50%% of window width");
+            ImGui::Text("PushItemWidth(GetWindowWidth() * 0.5f);");
             ImGui::PushItemWidth(ImGui::GetWindowWidth() * 0.5f);
             ImGui::InputFloat("float##2", &f);
             ImGui::PopItemWidth();
 
-            ImGui::Text("Right-aligned: Leave 100 pixels for label");
-            ImGui::PushItemWidth(-100);
+            ImGui::Text("PushItemWidth(GetContentRegionAvailWidth() * 0.5f);");
+            ImGui::PushItemWidth(ImGui::GetContentRegionAvailWidth() * 0.5f);
             ImGui::InputFloat("float##3", &f);
             ImGui::PopItemWidth();
 
+            ImGui::Text("PushItemWidth(-100);");
+            ImGui::PushItemWidth(-100);
+            ImGui::InputFloat("float##4", &f);
+            ImGui::PopItemWidth();
+
             ImGui::TreePop();
         }
 
@@ -1205,7 +1210,7 @@ void ImGui::ShowTestWindow(bool* opened)
         ImGui::Separator();
         ImGui::Spacing();
 
-        // Word-wrapping
+        // Word wrapping
         ImGui::Text("Word-wrapping:");
         ImGui::Columns(2, "word-wrapping");
         ImGui::Separator();