Internal: Added IsMouseDragPastThreshold(). Tweaks. Todo.

Demo: Showing how to use the format parameter of Slider/Drag functions to display the name of an enum value instead of the underlying integer value

docs/CHANGELOG.txt

@@ -95,6 +95,8 @@ Other Changes:
   also this type was added in 1.71 and not advertised as a public-facing feature).
 - Fonts: binary_to_compressed_c.cpp: Display an error message if failing to open/read the input font file.
 - Demo: Log, Console: Using a simpler stateless pattern for auto-scrolling.
+- Demo: Widgets: Showing how to use the format parameter of Slider/Drag functions to display the name
+  of an enum value instead of the underlying integer value.
 - Backends: DX10/DX11: Backup, clear and restore Geometry Shader is any is bound when calling renderer.
 - Backends: DX11: Clear Hull Shader, Domain Shader, Compute Shader before rendering. Not backing/restoring them.
 - Backends: OSX: Disabled default native Mac clipboard copy/paste implementation in core library (added in 1.71),

docs/TODO.txt

@@ -89,6 +89,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - input text: decorrelate layout from inputs - e.g. what's the easiest way to implement a nice IP/Mac address input editor?
  - input text: global callback system so user can plug in an expression evaluator easily. (#1691)
  - input text: force scroll to end or scroll to a given line/contents (so user can implement a log or a search feature)
+ - input text: a way to preview completion (e.g. disabled text completing from the cursor)
  - input text: a side bar that could e.g. preview where errors are. probably left to the user to draw but we'd need to give them the info there.
  - input text: a way for the user to provide syntax coloring.
  - input text: Shift+TAB with ImGuiInputTextFlags_AllowTabInput could eat preceding blanks, up to tab_count.
@@ -122,6 +123,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - columns: option to alternate background colors on odd/even scanlines.
  - columns: allow columns to recurse.
  - columns: allow a same columns set to be interrupted by e.g. CollapsingHeader and resume with columns in sync when moving them.
+ - columns: sizing is lossy when columns width is very small (default width may turn negative etc.)
  - columns: separator function or parameter that works within the column (currently Separator() bypass all columns) (#125)
  - columns: flag to add horizontal separator above/below?
  - columns/layout: setup minimum line height (equivalent of automatically calling AlignFirstTextHeightToWidgets)

imgui.cpp

@@ -4433,15 +4433,23 @@ bool ImGui::IsMouseDoubleClicked(int button)
     return g.IO.MouseDoubleClicked[button];
 }
 
+// [Internal] This doesn't test if the button is presed
+bool ImGui::IsMouseDragPastThreshold(int button, float lock_threshold)
+{
+    ImGuiContext& g = *GImGui;
+    IM_ASSERT(button >= 0 && button < IM_ARRAYSIZE(g.IO.MouseDown));
+    if (lock_threshold < 0.0f)
+        lock_threshold = g.IO.MouseDragThreshold;
+    return g.IO.MouseDragMaxDistanceSqr[button] >= lock_threshold * lock_threshold;
+}
+
 bool ImGui::IsMouseDragging(int button, float lock_threshold)
 {
     ImGuiContext& g = *GImGui;
     IM_ASSERT(button >= 0 && button < IM_ARRAYSIZE(g.IO.MouseDown));
     if (!g.IO.MouseDown[button])
         return false;
-    if (lock_threshold < 0.0f)
+    return IsMouseDragPastThreshold(button, lock_threshold);
-        lock_threshold = g.IO.MouseDragThreshold;
-    return g.IO.MouseDragMaxDistanceSqr[button] >= lock_threshold * lock_threshold;
 }
 
 ImVec2 ImGui::GetMousePos()
@@ -9719,6 +9727,9 @@ void ImGui::ShowMetricsWindow(bool* p_open)
             if (!node_open)
                 return;
 
+            if (window && !window->WasActive)
+                ImGui::Text("(Note: owning Window is inactive: DrawList is not being rendered!)");
+
             int elem_offset = 0;
             for (const ImDrawCmd* pcmd = draw_list->CmdBuffer.begin(); pcmd < draw_list->CmdBuffer.end(); elem_offset += pcmd->ElemCount, pcmd++)
             {

imgui_demo.cpp

@@ -539,8 +539,19 @@ static void ShowDemoWindowWidgets()
             static float f1=0.123f, f2=0.0f;
             ImGui::SliderFloat("slider float", &f1, 0.0f, 1.0f, "ratio = %.3f");
             ImGui::SliderFloat("slider float (curve)", &f2, -10.0f, 10.0f, "%.4f", 2.0f);
+
             static float angle = 0.0f;
             ImGui::SliderAngle("slider angle", &angle);
+
+            // Using the format string to display a name instead of an integer.
+            // Here we completely omit '%d' from the format string, so it'll only display a name.
+            // This technique can also be used with DragInt().
+            enum Element { Element_Fire, Element_Earth, Element_Air, Element_Water, Element_COUNT };
+            const char* element_names[Element_COUNT] = { "Fire", "Earth", "Air", "Water" };
+            static int current_element = Element_Fire;
+            const char* current_element_name = (current_element >= 0 && current_element < Element_COUNT) ? element_names[current_element] : "Unknown";
+            ImGui::SliderInt("slider enum", &current_element, 0, Element_COUNT - 1, current_element_name);
+            ImGui::SameLine(); HelpMarker("Using the format string parameter to display a name instead of the underlying integer.");
         }
 
         {
@@ -1782,9 +1793,9 @@ static void ShowDemoWindowLayout()
         ImGui::Text("SetNextItemWidth/PushItemWidth(-1)");
         ImGui::SameLine(); HelpMarker("Align to right edge");
         ImGui::PushItemWidth(-1);
-        ImGui::DragFloat("float##5a", &f);
+        ImGui::DragFloat("##float5a", &f);
-        ImGui::DragFloat("float##5b", &f);
+        ImGui::DragFloat("##float5b", &f);
-        ImGui::DragFloat("float##5c", &f);
+        ImGui::DragFloat("##float5c", &f);
         ImGui::PopItemWidth();
 
         ImGui::TreePop();

imgui_internal.h

@@ -1556,6 +1556,7 @@ namespace ImGui
     IMGUI_API void          SetNavIDWithRectRel(ImGuiID id, int nav_layer, const ImRect& rect_rel);
 
     // Inputs
+    inline bool             IsMouseDragPastThreshold(int button, float lock_threshold = -1.0f);
     inline bool             IsKeyPressedMap(ImGuiKey key, bool repeat = true)           { const int key_index = GImGui->IO.KeyMap[key]; return (key_index >= 0) ? IsKeyPressed(key_index, repeat) : false; }
     inline bool             IsNavInputDown(ImGuiNavInput n)                             { return GImGui->IO.NavInputs[n] > 0.0f; }
     inline bool             IsNavInputPressed(ImGuiNavInput n, ImGuiInputReadMode mode) { return GetNavInputAmount(n, mode) > 0.0f; }