Renamed SetNextTreeNodeOpen() to SetNextItemOpen(). Refactored SetNextItemXXX stuff to match SetNextWindowXXX code closely.

docs/CHANGELOG.txt

@@ -34,6 +34,7 @@ HOW TO UPDATE?
 
 Breaking Changes:
 - IO: changed AddInputCharacter(unsigned short c) signature to AddInputCharacter(unsigned int c).
+- Renamed SetNextTreeNodeOpen() to SetNextItemOpen(). Kept inline redirection function (will obsolete).
 
 Other Changes:
 - Columns: Fixed Separator from creating an extraneous draw command. (#125)

imgui.cpp

@@ -369,6 +369,7 @@ CODE
  When you are not sure about a old symbol or function name, try using the Search/Find function of your IDE to look for comments or references in all imgui files.
  You can read releases logs https://github.com/ocornut/imgui/releases for more details.
 
+ - 2019/05/13 (1.71) - renamed SetNextTreeNodeOpen() to SetNextItemOpen(). Kept inline redirection function (will obsolete).
  - 2019/05/11 (1.71) - changed io.AddInputCharacter(unsigned short c) signature to io.AddInputCharacter(unsigned int c).
  - 2019/04/29 (1.70) - improved ImDrawList thick strokes (>1.0f) preserving correct thickness up to 90 degrees angles (e.g. rectangles). If you have custom rendering using thick lines, they will appear thicker now.
  - 2019/04/29 (1.70) - removed GetContentRegionAvailWidth(), use GetContentRegionAvail().x instead. Kept inline redirection function (will obsolete).
@@ -2840,6 +2841,7 @@ bool ImGui::ItemAdd(const ImRect& bb, ImGuiID id, const ImRect* nav_bb_arg)
     window->DC.LastItemId = id;
     window->DC.LastItemRect = bb;
     window->DC.LastItemStatusFlags = ImGuiItemStatusFlags_None;
+    g.NextItemData.Flags = ImGuiNextItemDataFlags_None;
 
 #ifdef IMGUI_ENABLE_TEST_ENGINE
     if (id != 0)
@@ -5794,8 +5796,9 @@ void ImGui::FocusTopMostWindowUnderOne(ImGuiWindow* under_this_window, ImGuiWind
 
 void ImGui::SetNextItemWidth(float item_width)
 {
-    ImGuiWindow* window = GetCurrentWindow();
+    ImGuiContext& g = *GImGui;
-    window->DC.NextItemWidth = item_width;
+    g.NextItemData.Flags |= ImGuiNextItemDataFlags_HasWidth;
+    g.NextItemData.Width = item_width;
 }
 
 void ImGui::PushItemWidth(float item_width)
@@ -5825,15 +5828,16 @@ void ImGui::PopItemWidth()
 }
 
 // Calculate default item width given value passed to PushItemWidth() or SetNextItemWidth(),
-// Then consume the 
+// Then _consume_ the SetNextItemWidth() data.
 float ImGui::GetNextItemWidth()
 {
-    ImGuiWindow* window = GImGui->CurrentWindow;
+    ImGuiContext& g = *GImGui;
+    ImGuiWindow* window = g.CurrentWindow;
     float w;
-    if (window->DC.NextItemWidth != FLT_MAX)
+    if (g.NextItemData.Flags & ImGuiNextItemDataFlags_HasWidth)
     {
-        w = window->DC.NextItemWidth;
+        w = g.NextItemData.Width;
-        window->DC.NextItemWidth = FLT_MAX;
+        g.NextItemData.Flags &= ~ImGuiNextItemDataFlags_HasWidth;
     }
     else
     {
@@ -5852,10 +5856,10 @@ float ImGui::GetNextItemWidth()
 // (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;
+    ImGuiContext& g = *GImGui;
-    float backup_next_item_width = window->DC.NextItemWidth;
+    ImGuiNextItemDataFlags backup_flags = g.NextItemData.Flags;
     float w = GetNextItemWidth();
-    window->DC.NextItemWidth = backup_next_item_width;
+    g.NextItemData.Flags = backup_flags;
     return w;
 }
 

imgui.h

@@ -494,9 +494,9 @@ namespace ImGui
     IMGUI_API void          TreePop();                                                          // ~ Unindent()+PopId()
     IMGUI_API void          TreeAdvanceToLabelPos();                                            // advance cursor x position by GetTreeNodeToLabelSpacing()
     IMGUI_API float         GetTreeNodeToLabelSpacing();                                        // horizontal distance preceding label when using TreeNode*() or Bullet() == (g.FontSize + style.FramePadding.x*2) for a regular unframed TreeNode
-    IMGUI_API void          SetNextTreeNodeOpen(bool is_open, ImGuiCond cond = 0);              // set next TreeNode/CollapsingHeader open state.
     IMGUI_API bool          CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags = 0);  // if returning 'true' the header is open. doesn't indent nor push on ID stack. user doesn't have to call TreePop().
     IMGUI_API bool          CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags flags = 0); // when 'p_open' isn't NULL, display an additional small close button on upper right of the header
+    IMGUI_API void          SetNextItemOpen(bool is_open, ImGuiCond cond = 0);                  // set next TreeNode/CollapsingHeader open state.
 
     // Widgets: Selectables
     // - A selectable highlights when hovered, and can display another color when selected.
@@ -1173,7 +1173,7 @@ enum ImGuiMouseCursor_
 #endif
 };
 
-// Enumateration for ImGui::SetWindow***(), SetNextWindow***(), SetNextTreeNode***() functions
+// Enumateration for ImGui::SetWindow***(), SetNextWindow***(), SetNextItem***() functions
 // Represent a condition.
 // Important: Treat as a regular enum! Do NOT combine multiple values using binary operators! All the functions above treat 0 as a shortcut to ImGuiCond_Always.
 enum ImGuiCond_
@@ -1529,6 +1529,9 @@ struct ImGuiPayload
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
 namespace ImGui
 {
+    // OBSOLETED in 1.71 (from May 2019)
+    static inline void SetNextTreeNodeOpen(bool open, ImGuiCond cond = 0)   { SetNextItemOpen(open, cond); }
+
     // OBSOLETED in 1.70 (from May 2019)
     static inline float GetContentRegionAvailWidth()          { return GetContentRegionAvail().x; }
     // OBSOLETED in 1.69 (from Mar 2019)

imgui_demo.cpp

@@ -568,13 +568,20 @@ static void ShowDemoWindowWidgets()
         if (ImGui::TreeNode("Basic trees"))
         {
             for (int i = 0; i < 5; i++)
+            {
+                // Use SetNextItemOpen() so set the default state of a node to be open. 
+                // We could also use TreeNodeEx() with the ImGuiTreeNodeFlags_DefaultOpen flag to achieve the same thing!
+                if (i == 0)
+                    ImGui::SetNextItemOpen(true, ImGuiCond_Once);
+
                 if (ImGui::TreeNode((void*)(intptr_t)i, "Child %d", i))
                 {
                     ImGui::Text("blah blah");
                     ImGui::SameLine();
-                    if (ImGui::SmallButton("button")) { };
+                    if (ImGui::SmallButton("button")) {};
                     ImGui::TreePop();
                 }
+            }
             ImGui::TreePop();
         }
 

imgui_internal.h

@@ -72,6 +72,7 @@ struct ImGuiItemHoveredDataBackup;  // Backup and restore IsItemHovered() intern
 struct ImGuiMenuColumns;            // Simple column measurement, currently used for MenuItem() only
 struct ImGuiNavMoveResult;          // Result of a directional navigation move query result
 struct ImGuiNextWindowData;         // Storage for SetNextWindow** functions
+struct ImGuiNextItemData;           // Storage for SetNextItem** functions
 struct ImGuiPopupData;              // Storage for current popup stack
 struct ImGuiSettingsHandler;        // Storage for one type registered in the .ini file
 struct ImGuiStyleMod;               // Stacked style modifier, backup of modified data so we can restore it
@@ -90,6 +91,7 @@ typedef int ImGuiItemStatusFlags;       // -> enum ImGuiItemStatusFlags_    // F
 typedef int ImGuiNavHighlightFlags;     // -> enum ImGuiNavHighlightFlags_  // Flags: for RenderNavHighlight()
 typedef int ImGuiNavDirSourceFlags;     // -> enum ImGuiNavDirSourceFlags_  // Flags: for GetNavInputAmount2d()
 typedef int ImGuiNavMoveFlags;          // -> enum ImGuiNavMoveFlags_       // Flags: for navigation requests
+typedef int ImGuiNextItemDataFlags;     // -> enum ImGuiNextItemDataFlags_  // Flags: for SetNextItemXXX() functions
 typedef int ImGuiNextWindowDataFlags;   // -> enum ImGuiNextWindowDataFlags_// Flags: for SetNextWindowXXX() functions
 typedef int ImGuiSeparatorFlags;        // -> enum ImGuiSeparatorFlags_     // Flags: for SeparatorEx()
 typedef int ImGuiSliderFlags;           // -> enum ImGuiSliderFlags_        // Flags: for SliderBehavior()
@@ -778,6 +780,24 @@ struct ImGuiNextWindowData
     inline void ClearFlags()    { Flags = ImGuiNextWindowDataFlags_None; }
 };
 
+enum ImGuiNextItemDataFlags_
+{
+    ImGuiNextItemDataFlags_None     = 0,
+    ImGuiNextItemDataFlags_HasWidth = 1 << 0,
+    ImGuiNextItemDataFlags_HasOpen  = 1 << 1
+};
+
+struct ImGuiNextItemData
+{
+    ImGuiNextItemDataFlags      Flags;
+    float                       Width;          // Set by SetNextItemWidth().
+    bool                        OpenVal;        // Set by SetNextItemOpen() function.
+    ImGuiCond                   OpenCond;
+
+    ImGuiNextItemData()         { memset(this, 0, sizeof(*this)); }
+    inline void ClearFlags()    { Flags = ImGuiNextItemDataFlags_None; }
+};
+
 //-----------------------------------------------------------------------------
 // Tabs
 //-----------------------------------------------------------------------------
@@ -858,8 +878,7 @@ struct ImGuiContext
 
     // Next window/item data
     ImGuiNextWindowData     NextWindowData;                     // Storage for SetNextWindow** functions
-    bool                    NextTreeNodeOpenVal;                // Storage for SetNextTreeNode** functions
+    ImGuiNextItemData       NextItemData;                       // Storage for SetNextItem** functions
-    ImGuiCond               NextTreeNodeOpenCond;
 
     // Shared stacks
     ImVector<ImGuiColorMod> ColorModifiers;                     // Stack for PushStyleColor()/PopStyleColor()
@@ -1041,9 +1060,6 @@ struct ImGuiContext
         LastActiveId = 0;
         LastActiveIdTimer = 0.0f;
 
-        NextTreeNodeOpenVal = false;
-        NextTreeNodeOpenCond = 0;
-
         NavWindow = NULL;
         NavId = NavActivateId = NavActivateDownId = NavActivatePressedId = NavInputId = 0;
         NavJustTabbedId = NavJustMovedToId = NavJustMovedToMultiSelectScopeId = NavNextActivateId = 0;
@@ -1166,7 +1182,6 @@ 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;
@@ -1202,7 +1217,6 @@ struct IMGUI_API ImGuiWindowTempData
 
         ItemFlags = ImGuiItemFlags_Default_;
         ItemWidth = 0.0f;
-        NextItemWidth = +FLT_MAX;
         TextWrapPos = -1.0f;
         memset(StackSizesBackup, 0, sizeof(StackSizesBackup));
 
@@ -1569,7 +1583,7 @@ namespace ImGui
     IMGUI_API bool          SliderBehavior(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, void* v, const void* v_min, const void* v_max, const char* format, float power, ImGuiSliderFlags flags, ImRect* out_grab_bb);
     IMGUI_API bool          SplitterBehavior(const ImRect& bb, ImGuiID id, ImGuiAxis axis, float* size1, float* size2, float min_size1, float min_size2, float hover_extend = 0.0f, float hover_visibility_delay = 0.0f);
     IMGUI_API bool          TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* label, const char* label_end = NULL);
-    IMGUI_API bool          TreeNodeBehaviorIsOpen(ImGuiID id, ImGuiTreeNodeFlags flags = 0);                     // Consume previous SetNextTreeNodeOpened() data, if any. May return true when logging
+    IMGUI_API bool          TreeNodeBehaviorIsOpen(ImGuiID id, ImGuiTreeNodeFlags flags = 0);                     // Consume previous SetNextItemOpen() data, if any. May return true when logging
     IMGUI_API void          TreePushOverrideID(ImGuiID id);
 
     // Template functions are instantiated in imgui_widgets.cpp for a finite number of types.

imgui_widgets.cpp

@@ -4906,7 +4906,7 @@ void ImGui::ColorPickerOptionsPopup(const float* ref_col, ImGuiColorEditFlags fl
 // - TreePop()
 // - TreeAdvanceToLabelPos()
 // - GetTreeNodeToLabelSpacing()
-// - SetNextTreeNodeOpen()
+// - SetNextItemOpen()
 // - CollapsingHeader()
 //-------------------------------------------------------------------------
 
@@ -5000,17 +5000,17 @@ bool ImGui::TreeNodeBehaviorIsOpen(ImGuiID id, ImGuiTreeNodeFlags flags)
     if (flags & ImGuiTreeNodeFlags_Leaf)
         return true;
 
-    // We only write to the tree storage if the user clicks (or explicitly use SetNextTreeNode*** functions)
+    // We only write to the tree storage if the user clicks (or explicitly use the SetNextItemOpen function)
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = g.CurrentWindow;
     ImGuiStorage* storage = window->DC.StateStorage;
 
     bool is_open;
-    if (g.NextTreeNodeOpenCond != 0)
+    if (g.NextItemData.Flags & ImGuiNextItemDataFlags_HasOpen)
     {
-        if (g.NextTreeNodeOpenCond & ImGuiCond_Always)
+        if (g.NextItemData.OpenCond & ImGuiCond_Always)
         {
-            is_open = g.NextTreeNodeOpenVal;
+            is_open = g.NextItemData.OpenVal;
             storage->SetInt(id, is_open);
         }
         else
@@ -5019,7 +5019,7 @@ bool ImGui::TreeNodeBehaviorIsOpen(ImGuiID id, ImGuiTreeNodeFlags flags)
             const int stored_value = storage->GetInt(id, -1);
             if (stored_value == -1)
             {
-                is_open = g.NextTreeNodeOpenVal;
+                is_open = g.NextItemData.OpenVal;
                 storage->SetInt(id, is_open);
             }
             else
@@ -5027,7 +5027,6 @@ bool ImGui::TreeNodeBehaviorIsOpen(ImGuiID id, ImGuiTreeNodeFlags flags)
                 is_open = stored_value != 0;
             }
         }
-        g.NextTreeNodeOpenCond = 0;
     }
     else
     {
@@ -5256,13 +5255,14 @@ float ImGui::GetTreeNodeToLabelSpacing()
     return g.FontSize + (g.Style.FramePadding.x * 2.0f);
 }
 
-void ImGui::SetNextTreeNodeOpen(bool is_open, ImGuiCond cond)
+void ImGui::SetNextItemOpen(bool is_open, ImGuiCond cond)
 {
     ImGuiContext& g = *GImGui;
     if (g.CurrentWindow->SkipItems)
         return;
-    g.NextTreeNodeOpenVal = is_open;
+    g.NextItemData.Flags |= ImGuiNextItemDataFlags_HasOpen;
-    g.NextTreeNodeOpenCond = cond ? cond : ImGuiCond_Always;
+    g.NextItemData.OpenVal = is_open;
+    g.NextItemData.OpenCond = cond ? cond : ImGuiCond_Always;
 }
 
 // CollapsingHeader returns true when opened but do not indent nor push into the ID stack (because of the ImGuiTreeNodeFlags_NoTreePushOnOpen flag).