Comments in demo and opengl code + Internals: Added HoveredIdNotActiveTimer tracking hovering time unless the item is active, which is a commonly useful pattern.

examples/imgui_impl_opengl3.cpp

@@ -306,7 +306,7 @@ void ImGui_ImplOpenGL3_DestroyFontsTexture()
     }
 }
 
-// If you get an error please report on github. You may try different GL context version or GLSL version.
+// If you get an error please report on github. You may try different GL context version or GLSL version. See GL<>GLSL version table at the top of this file.
 static bool CheckShader(GLuint handle, const char* desc)
 {
     GLint status = 0, log_length = 0;
@@ -324,14 +324,14 @@ static bool CheckShader(GLuint handle, const char* desc)
     return (GLboolean)status == GL_TRUE;
 }
 
-// If you get an error please report on github. You may try different GL context version or GLSL version.
+// If you get an error please report on GitHub. You may try different GL context version or GLSL version.
 static bool CheckProgram(GLuint handle, const char* desc)
 {
     GLint status = 0, log_length = 0;
     glGetProgramiv(handle, GL_LINK_STATUS, &status);
     glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &log_length);
     if ((GLboolean)status == GL_FALSE)
-        fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link %s!\n", desc);
+        fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link %s! (with GLSL '%s')\n", desc, g_GlslVersionString);
     if (log_length > 0)
     {
         ImVector<char> buf;

imgui.cpp

@@ -2511,7 +2511,7 @@ void ImGui::SetHoveredID(ImGuiID id)
     g.HoveredId = id;
     g.HoveredIdAllowOverlap = false;
     if (id != 0 && g.HoveredIdPreviousFrame != id)
-        g.HoveredIdTimer = 0.0f;
+        g.HoveredIdTimer = g.HoveredIdNotActiveTimer = 0.0f;
 }
 
 ImGuiID ImGui::GetHoveredID()
@@ -3191,8 +3191,12 @@ void ImGui::NewFrame()
     // Clear reference to active widget if the widget isn't alive anymore
     if (!g.HoveredIdPreviousFrame)
         g.HoveredIdTimer = 0.0f;
+    if (!g.HoveredIdPreviousFrame || (g.HoveredId && g.ActiveId == g.HoveredId))
+        g.HoveredIdNotActiveTimer = 0.0f;
     if (g.HoveredId)
         g.HoveredIdTimer += g.IO.DeltaTime;
+    if (g.HoveredId && g.ActiveId != g.HoveredId)
+        g.HoveredIdNotActiveTimer += g.IO.DeltaTime;
     g.HoveredIdPreviousFrame = g.HoveredId;
     g.HoveredId = 0;
     g.HoveredIdAllowOverlap = false;

imgui_demo.cpp

@@ -1,22 +1,25 @@
 // dear imgui, v1.66 WIP
 // (demo code)
 
-// Message to the person tempted to delete this file when integrating ImGui into their code base:
-// Don't do it! Do NOT remove this file from your project! It is useful reference code that you and other users will want to refer to.
+// Message to the person tempted to delete this file when integrating Dear ImGui into their code base:
+// Do NOT remove this file from your project! Think again! It is the most useful reference code that you and other coders
+// will want to refer to and call. Have the ImGui::ShowDemoWindow() function wired in an always-available debug menu of 
+// your game/app! Removing this file from your project is hindering access to documentation for everyone in your team, 
+// likely leading you to poorer usage of the library.
 // Everything in this file will be stripped out by the linker if you don't call ImGui::ShowDemoWindow().
-// During development, you can call ImGui::ShowDemoWindow() in your code to learn about various features of ImGui. Have it wired in a debug menu!
-// Removing this file from your project is hindering access to documentation for everyone in your team, likely leading you to poorer usage of the library.
-// Note that you can #define IMGUI_DISABLE_DEMO_WINDOWS in imconfig.h for the same effect.
-// If you want to link core ImGui in your final builds but not those demo windows, #define IMGUI_DISABLE_DEMO_WINDOWS in imconfig.h and those functions will be empty.
-// In other situation, when you have ImGui available you probably want this to be available for reference and execution.
+// If you want to link core Dear ImGui in your shipped builds but want an easy guarantee that the demo will not be linked, 
+// you can setup your imconfig.h with #define IMGUI_DISABLE_DEMO_WINDOWS and those functions will be empty.
+// In other situation, whenever you have Dear ImGui available you probably want this to be available for reference.
 // Thank you,
 // -Your beloved friend, imgui_demo.cpp (that you won't delete)
 
-// Message to beginner C/C++ programmers about the meaning of the 'static' keyword: in this demo code, we frequently we use 'static' variables inside functions.
-// A static variable persist across calls, so it is essentially like a global variable but declared inside the scope of the function.
-// We do this as a way to gather code and data in the same place, just to make the demo code faster to read, faster to write, and use less code.
-// It also happens to be a convenient way of storing simple UI related information as long as your function doesn't need to be reentrant or used in threads.
-// This might be a pattern you occasionally want to use in your code, but most of the real data you would be editing is likely to be stored outside your functions.
+// Message to beginner C/C++ programmers about the meaning of the 'static' keyword: 
+// In this demo code, we frequently we use 'static' variables inside functions. A static variable persist across calls, so it is 
+// essentially like a global variable but declared inside the scope of the function. We do this as a way to gather code and data 
+// in the same place, to make the demo source code faster to read, faster to write, and smaller in size.
+// It also happens to be a convenient way of storing simple UI related information as long as your function doesn't need to be reentrant
+// or used in threads. This might be a pattern you will want to use in your code, but most of the real data you would be editing is 
+// likely going to be stored outside your functions.
 
 /*
 

imgui_internal.h

@@ -662,7 +662,8 @@ struct ImGuiContext
     ImGuiID                 HoveredId;                          // Hovered widget
     bool                    HoveredIdAllowOverlap;
     ImGuiID                 HoveredIdPreviousFrame;
-    float                   HoveredIdTimer;
+    float                   HoveredIdTimer;                     // Measure contiguous hovering time
+    float                   HoveredIdNotActiveTimer;            // Measure contiguous hovering time where the item has not been active
     ImGuiID                 ActiveId;                           // Active widget
     ImGuiID                 ActiveIdPreviousFrame;
     ImGuiID                 ActiveIdIsAlive;                    // Active widget has been seen this frame (we can't use a bool as the ActiveId may change within the frame)
@@ -809,7 +810,7 @@ struct ImGuiContext
         HoveredId = 0;
         HoveredIdAllowOverlap = false;
         HoveredIdPreviousFrame = 0;
-        HoveredIdTimer = 0.0f;
+        HoveredIdTimer = HoveredIdNotActiveTimer = 0.0f;
         ActiveId = 0;
         ActiveIdPreviousFrame = 0;
         ActiveIdIsAlive = 0;