Added GetKeyPressedAmount() (from Nav branch) to be able to measure fast repeat rate accurately. Added internal CalcTypematicPressedRepeatAmount() function.

imgui.cpp

@@ -3154,6 +3154,25 @@ bool ImGui::IsKeyDown(int user_key_index)
     return GImGui->IO.KeysDown[user_key_index];
 }
 
+int ImGui::CalcTypematicPressedRepeatAmount(float t, float t_prev, float repeat_delay, float repeat_rate)
+{
+    if (t == 0.0f)
+        return 1;
+    if (t <= repeat_delay || repeat_rate <= 0.0f)
+        return 0;
+    const int count = (int)((t - repeat_delay) / repeat_rate) - (int)((t_prev - repeat_delay) / repeat_rate);
+    return (count > 0) ? count : 0;
+}
+
+int ImGui::GetKeyPressedAmount(int key_index, float repeat_delay, float repeat_rate)
+{
+    ImGuiContext& g = *GImGui;
+    if (key_index < 0) return false;
+    IM_ASSERT(key_index >= 0 && key_index < IM_ARRAYSIZE(g.IO.KeysDown));
+    const float t = g.IO.KeysDownDuration[key_index];
+    return CalcTypematicPressedRepeatAmount(t, t - g.IO.DeltaTime, repeat_delay, repeat_rate);
+}
+
 bool ImGui::IsKeyPressed(int user_key_index, bool repeat)
 {
     ImGuiContext& g = *GImGui;
@@ -3162,13 +3181,8 @@ bool ImGui::IsKeyPressed(int user_key_index, bool repeat)
     const float t = g.IO.KeysDownDuration[user_key_index];
     if (t == 0.0f)
         return true;
-
     if (repeat && t > g.IO.KeyRepeatDelay)
-    {
-        float delay = g.IO.KeyRepeatDelay, rate = g.IO.KeyRepeatRate;
-        if ((fmodf(t - delay, rate) > rate*0.5f) != (fmodf(t - delay - g.IO.DeltaTime, rate) > rate*0.5f))
-            return true;
-    }
+        return GetKeyPressedAmount(user_key_index, g.IO.KeyRepeatDelay, g.IO.KeyRepeatRate) > 0;
     return false;
 }
 

imgui.h

@@ -452,6 +452,7 @@ namespace ImGui
     IMGUI_API bool          IsKeyDown(int user_key_index);                                      // is key being held. == io.KeysDown[user_key_index]. note that imgui doesn't know the semantic of each entry of io.KeyDown[]. Use your own indices/enums according to how your backend/engine stored them into KeyDown[]!
     IMGUI_API bool          IsKeyPressed(int user_key_index, bool repeat = true);               // was key pressed (went from !Down to Down). if repeat=true, uses io.KeyRepeatDelay / KeyRepeatRate
     IMGUI_API bool          IsKeyReleased(int user_key_index);                                  // was key released (went from Down to !Down)..
+    IMGUI_API int           GetKeyPressedAmount(int key_index, float repeat_delay, float rate); // uses provided repeat rate/delay. return a count, most often 0 or 1 but might be >1 if RepeatRate is small enough that DeltaTime > RepeatRate
     IMGUI_API bool          IsMouseDown(int button);                                            // is mouse button held
     IMGUI_API bool          IsMouseClicked(int button, bool repeat = false);                    // did mouse button clicked (went from !Down to Down)
     IMGUI_API bool          IsMouseDoubleClicked(int button);                                   // did mouse button double-clicked. a double-click returns false in IsMouseClicked(). uses io.MouseDoubleClickTime.

imgui_internal.h

@@ -764,6 +764,8 @@ namespace ImGui
     IMGUI_API void          OpenPopupEx(ImGuiID id, bool reopen_existing);
     IMGUI_API bool          IsPopupOpen(ImGuiID id);
 
+    IMGUI_API int           CalcTypematicPressedRepeatAmount(float t, float t_prev, float repeat_delay, float repeat_rate);
+
     // New Columns API
     IMGUI_API void          BeginColumns(const char* id, int count, ImGuiColumnsFlags flags = 0); // setup number of columns. use an identifier to distinguish multiple column sets. close with EndColumns().
     IMGUI_API void          EndColumns();                                                         // close columns