Layout: Fixed mixing up SameLine() and SetCursorPos() together. SameLine() is a stateful.

+ minor unrelatedcomments.

docs/CHANGELOG.txt

@@ -56,6 +56,9 @@ Other Changes:
   or interacting with a game/3D view).
 - Clipper: Fixed a regression in 1.86 when not calling clipper.End() and late destructing the
   clipper instance. High-level languages (Lua,Rust etc.) would typically be affected. (#4822)
+- Layout: Fixed mixing up SameLine() and SetCursorPos() together from creating situations where line
+  height would be emitted from the wrong location (e.g. 'ItemA+SameLine()+SetCursorPos()+ItemB' would
+  emit ItemA worth of height from the position of ItemB, which is not necessarily aligned with ItemA).
 - Sliders, Drags: Fixed dragging when using hexadecimal display format string. (#5165, #3133)
 - Sliders, Drags: Fixed manual input when using hexadecimal display format string. (#5165, #3133)
 - InputScalar: Fixed manual input when using %03d style width in display format string. (#5165, #3133)
@@ -109,6 +112,7 @@ Breaking Changes:
   - Added io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() functions,
     obsoleting writing directly to io.MousePos, io.MouseDown[], io.MouseWheel, etc.
   - This enable input queue trickling to support low framerates. (#2787, #1992, #3383, #2525, #1320)
+  - For all calls to IO new functions, the Dear ImGui context should be bound/current.
 - Reworked IO keyboard input API: (#4921, #2625, #3724) [@thedmd, @ocornut]
   - Added io.AddKeyEvent() function, obsoleting writing directly to io.KeyMap[], io.KeysDown[] arrays.
   - For keyboard modifiers, you can call io.AddKeyEvent() with ImGuiKey_ModXXX values,

imgui.cpp

@@ -395,6 +395,7 @@ CODE
                         - Backend writing to io.MouseDown[]            -> backend should call io.AddMouseButtonEvent()
                         - Backend writing to io.MouseWheel             -> backend should call io.AddMouseWheelEvent()
                         - Backend writing to io.MouseHoveredViewport   -> backend should call io.AddMouseViewportEvent() [Docking branch w/ multi-viewports only]
+                       note: for all calls to IO new functions, the Dear ImGui context should be bound/current.
  - 2022/01/10 (1.87) - inputs: reworked keyboard IO. Removed io.KeyMap[], io.KeysDown[] in favor of calling io.AddKeyEvent(). Removed GetKeyIndex(), now unecessary. All IsKeyXXX() functions now take ImGuiKey values. All features are still functional until IMGUI_DISABLE_OBSOLETE_KEYIO is defined. Read Changelog and Release Notes for details.
                         - IsKeyPressed(MY_NATIVE_KEY_XXX)              -> use IsKeyPressed(ImGuiKey_XXX)
                         - IsKeyPressed(GetKeyIndex(ImGuiKey_XXX))      -> use IsKeyPressed(ImGuiKey_XXX)
@@ -6490,6 +6491,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         window->DC.IdealMaxPos = window->DC.CursorStartPos;
         window->DC.CurrLineSize = window->DC.PrevLineSize = ImVec2(0.0f, 0.0f);
         window->DC.CurrLineTextBaseOffset = window->DC.PrevLineTextBaseOffset = 0.0f;
+        window->DC.IsSameLine = false;
 
         window->DC.NavLayerCurrent = ImGuiNavLayer_Main;
         window->DC.NavLayersActiveMask = window->DC.NavLayersActiveMaskNext;
@@ -8203,14 +8205,16 @@ void ImGui::ItemSize(const ImVec2& size, float text_baseline_y)
     // In theory we should be offsetting the starting position (window->DC.CursorPos), that will be the topic of a larger refactor,
     // but since ItemSize() is not yet an API that moves the cursor (to handle e.g. wrapping) enlarging the height has the same effect.
     const float offset_to_match_baseline_y = (text_baseline_y >= 0) ? ImMax(0.0f, window->DC.CurrLineTextBaseOffset - text_baseline_y) : 0.0f;
-    const float line_height = ImMax(window->DC.CurrLineSize.y, size.y + offset_to_match_baseline_y);
+
+    const float line_y1 = window->DC.IsSameLine ? window->DC.CursorPosPrevLine.y : window->DC.CursorPos.y;
+    const float line_height = ImMax(window->DC.CurrLineSize.y, /*ImMax(*/window->DC.CursorPos.y - line_y1/*, 0.0f)*/ + size.y + offset_to_match_baseline_y);
 
     // Always align ourselves on pixel boundaries
     //if (g.IO.KeyAlt) window->DrawList->AddRect(window->DC.CursorPos, window->DC.CursorPos + ImVec2(size.x, line_height), IM_COL32(255,0,0,200)); // [DEBUG]
     window->DC.CursorPosPrevLine.x = window->DC.CursorPos.x + size.x;
-    window->DC.CursorPosPrevLine.y = window->DC.CursorPos.y;
+    window->DC.CursorPosPrevLine.y = line_y1;
     window->DC.CursorPos.x = IM_FLOOR(window->Pos.x + window->DC.Indent.x + window->DC.ColumnsOffset.x);    // Next line
-    window->DC.CursorPos.y = IM_FLOOR(window->DC.CursorPos.y + line_height + g.Style.ItemSpacing.y);        // Next line
+    window->DC.CursorPos.y = IM_FLOOR(line_y1 + line_height + g.Style.ItemSpacing.y);                    // Next line
     window->DC.CursorMaxPos.x = ImMax(window->DC.CursorMaxPos.x, window->DC.CursorPosPrevLine.x);
     window->DC.CursorMaxPos.y = ImMax(window->DC.CursorMaxPos.y, window->DC.CursorPos.y - g.Style.ItemSpacing.y);
     //if (g.IO.KeyAlt) window->DrawList->AddCircle(window->DC.CursorMaxPos, 3.0f, IM_COL32(255,0,0,255), 4); // [DEBUG]
@@ -8219,6 +8223,7 @@ void ImGui::ItemSize(const ImVec2& size, float text_baseline_y)
     window->DC.CurrLineSize.y = 0.0f;
     window->DC.PrevLineTextBaseOffset = ImMax(window->DC.CurrLineTextBaseOffset, text_baseline_y);
     window->DC.CurrLineTextBaseOffset = 0.0f;
+    window->DC.IsSameLine = false;
 
     // Horizontal layout mode
     if (window->DC.LayoutType == ImGuiLayoutType_Horizontal)
@@ -8322,6 +8327,7 @@ void ImGui::SameLine(float offset_from_start_x, float spacing_w)
     }
     window->DC.CurrLineSize = window->DC.PrevLineSize;
     window->DC.CurrLineTextBaseOffset = window->DC.PrevLineTextBaseOffset;
+    window->DC.IsSameLine = true;
 }
 
 ImVec2 ImGui::GetCursorScreenPos()

imgui.h

@@ -65,7 +65,7 @@ Index of this file:
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
 #define IMGUI_VERSION               "1.88 WIP"
-#define IMGUI_VERSION_NUM           18717
+#define IMGUI_VERSION_NUM           18718
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 #define IMGUI_HAS_TABLE
 

imgui_demo.cpp

@@ -1855,10 +1855,9 @@ static void ShowDemoWindowWidgets()
         ImGui::Combo("Display Mode", &display_mode, "Auto/Current\0None\0RGB Only\0HSV Only\0Hex Only\0");
         ImGui::SameLine(); HelpMarker(
             "ColorEdit defaults to displaying RGB inputs if you don't specify a display mode, "
-            "but the user can change it with a right-click.\n\nColorPicker defaults to displaying RGB+HSV+Hex "
+            "but the user can change it with a right-click on those inputs.\n\nColorPicker defaults to displaying RGB+HSV+Hex "
             "if you don't specify a display mode.\n\nYou can change the defaults using SetColorEditOptions().");
-        ImGui::Combo("Picker Mode", &picker_mode, "Auto/Current\0Hue bar + SV rect\0Hue wheel + SV triangle\0");
+        ImGui::SameLine(); HelpMarker("When not specified explicitly (Auto/Current mode), user can right-click the picker to change mode.");
-        ImGui::SameLine(); HelpMarker("User can right-click the picker to change mode.");
         ImGuiColorEditFlags flags = misc_flags;
         if (!alpha)            flags |= ImGuiColorEditFlags_NoAlpha;        // This is by default if you call ColorPicker3() instead of ColorPicker4()
         if (alpha_bar)         flags |= ImGuiColorEditFlags_AlphaBar;
@@ -3421,7 +3420,7 @@ static void ShowDemoWindowPopups()
         {
             HelpMarker("Text() elements don't have stable identifiers so we need to provide one.");
             static float value = 0.5f;
-            ImGui::Text("Value = %.3f <-- (1) right-click this value", value);
+            ImGui::Text("Value = %.3f <-- (1) right-click this text", value);
             if (ImGui::BeginPopupContextItem("my popup"))
             {
                 if (ImGui::Selectable("Set to zero")) value = 0.0f;

imgui_internal.h

@@ -1979,6 +1979,7 @@ struct IMGUI_API ImGuiWindowTempData
     ImVec2                  PrevLineSize;
     float                   CurrLineTextBaseOffset; // Baseline offset (0.0f by default on a new line, generally == style.FramePadding.y when a framed item has been added).
     float                   PrevLineTextBaseOffset;
+    bool                    IsSameLine;
     ImVec1                  Indent;                 // Indentation / start position from left of window (increased by TreePush/TreePop, etc.)
     ImVec1                  ColumnsOffset;          // Offset to the current column (if ColumnsCurrent > 0). FIXME: This and the above should be a stack to allow use cases like Tree->Column->Tree. Need revamp columns API.
     ImVec1                  GroupOffset;

imgui_widgets.cpp

@@ -1342,6 +1342,7 @@ void ImGui::NewLine()
     ImGuiContext& g = *GImGui;
     const ImGuiLayoutType backup_layout_type = window->DC.LayoutType;
     window->DC.LayoutType = ImGuiLayoutType_Vertical;
+    window->DC.IsSameLine = false;
     if (window->DC.CurrLineSize.y > 0.0f)     // In the event that we are on a line with items that is smaller that FontSize high, we will preserve its height.
         ItemSize(ImVec2(0, 0));
     else
@@ -1734,6 +1735,7 @@ bool ImGui::BeginComboPreview()
     window->DC.CursorPos = preview_data->PreviewRect.Min + g.Style.FramePadding;
     window->DC.CursorMaxPos = window->DC.CursorPos;
     window->DC.LayoutType = ImGuiLayoutType_Horizontal;
+    window->DC.IsSameLine = false;
     PushClipRect(preview_data->PreviewRect.Min, preview_data->PreviewRect.Max, true);
 
     return true;
@@ -1759,6 +1761,7 @@ void ImGui::EndComboPreview()
     window->DC.CursorPosPrevLine = preview_data->BackupCursorPosPrevLine;
     window->DC.PrevLineTextBaseOffset = preview_data->BackupPrevLineTextBaseOffset;
     window->DC.LayoutType = preview_data->BackupLayout;
+    window->DC.IsSameLine = false;
     preview_data->PreviewRect = ImRect();
 }
 
@@ -6730,6 +6733,7 @@ bool ImGui::BeginMenuBar()
     // We overwrite CursorMaxPos because BeginGroup sets it to CursorPos (essentially the .EmitItem hack in EndMenuBar() would need something analogous here, maybe a BeginGroupEx() with flags).
     window->DC.CursorPos = window->DC.CursorMaxPos = ImVec2(bar_rect.Min.x + window->DC.MenuBarOffset.x, bar_rect.Min.y + window->DC.MenuBarOffset.y);
     window->DC.LayoutType = ImGuiLayoutType_Horizontal;
+    window->DC.IsSameLine = false;
     window->DC.NavLayerCurrent = ImGuiNavLayer_Menu;
     window->DC.MenuBarAppending = true;
     AlignTextToFramePadding();
@@ -6773,6 +6777,7 @@ void ImGui::EndMenuBar()
     g.GroupStack.back().EmitItem = false;
     EndGroup(); // Restore position on layer 0
     window->DC.LayoutType = ImGuiLayoutType_Vertical;
+    window->DC.IsSameLine = false;
     window->DC.NavLayerCurrent = ImGuiNavLayer_Main;
     window->DC.MenuBarAppending = false;
 }