From b13d281356e1f6006bd78537b0a14e36b8b9faa3 Mon Sep 17 00:00:00 2001
From: omar <omarcornut@gmail.com>
Date: Sun, 29 Oct 2017 23:46:32 +0100
Subject: [PATCH] Maintaining ActiveIdTimer and HoveredIdTimer (the later is
 useful for drag and drop, both will be of course for creators of custom
 widgets)

---
 imgui.cpp        | 11 +++++++++--
 imgui_internal.h |  4 ++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/imgui.cpp b/imgui.cpp
index 0c2e72a59..1c101e0f4 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -1883,6 +1883,8 @@ void ImGui::SetActiveID(ImGuiID id, ImGuiWindow* window)
 {
     ImGuiContext& g = *GImGui;
     g.ActiveIdIsJustActivated = (g.ActiveId != id);
+    if (g.ActiveIdIsJustActivated)
+        g.ActiveIdTimer = 0.0f;
     g.ActiveId = id;
     g.ActiveIdAllowOverlap = false;
     g.ActiveIdIsAlive |= (id != 0);
@@ -1899,6 +1901,7 @@ void ImGui::SetHoveredID(ImGuiID id)
     ImGuiContext& g = *GImGui;
     g.HoveredId = id;
     g.HoveredIdAllowOverlap = false;
+    g.HoveredIdTimer = (id != 0 && g.HoveredIdPreviousFrame == id) ? (g.HoveredIdTimer + g.IO.DeltaTime) : 0.0f;
 }
 
 void ImGui::KeepAliveID(ImGuiID id)
@@ -2220,11 +2223,15 @@ void ImGui::NewFrame()
     g.RenderDrawData.CmdListsCount = g.RenderDrawData.TotalVtxCount = g.RenderDrawData.TotalIdxCount = 0;
 
     // Clear reference to active widget if the widget isn't alive anymore
+    if (!g.HoveredIdPreviousFrame)
+        g.HoveredIdTimer = 0.0f;
     g.HoveredIdPreviousFrame = g.HoveredId;
     g.HoveredId = 0;
     g.HoveredIdAllowOverlap = false;
     if (!g.ActiveIdIsAlive && g.ActiveIdPreviousFrame == g.ActiveId && g.ActiveId != 0)
         ClearActiveID();
+    if (g.ActiveId)
+        g.ActiveIdTimer += g.IO.DeltaTime;
     g.ActiveIdPreviousFrame = g.ActiveId;
     g.ActiveIdIsAlive = false;
     g.ActiveIdIsJustActivated = false;
@@ -10820,8 +10827,8 @@ void ImGui::ShowMetricsWindow(bool* p_open)
         {
             ImGui::Text("HoveredWindow: '%s'", g.HoveredWindow ? g.HoveredWindow->Name : "NULL");
             ImGui::Text("HoveredRootWindow: '%s'", g.HoveredRootWindow ? g.HoveredRootWindow->Name : "NULL");
-            ImGui::Text("HoveredId: 0x%08X/0x%08X", g.HoveredId, g.HoveredIdPreviousFrame); // Data is "in-flight" so depending on when the Metrics window is called we may see current frame information or not
-            ImGui::Text("ActiveId: 0x%08X/0x%08X", g.ActiveId, g.ActiveIdPreviousFrame);
+            ImGui::Text("HoveredId: 0x%08X/0x%08X (%.2f sec)", g.HoveredId, g.HoveredIdPreviousFrame, g.HoveredIdTimer); // Data is "in-flight" so depending on when the Metrics window is called we may see current frame information or not
+            ImGui::Text("ActiveId: 0x%08X/0x%08X (%.2f sec)", g.ActiveId, g.ActiveIdPreviousFrame, g.ActiveIdTimer);
             ImGui::Text("ActiveIdWindow: '%s'", g.ActiveIdWindow ? g.ActiveIdWindow->Name : "NULL");
             ImGui::Text("NavWindow: '%s'", g.NavWindow ? g.NavWindow->Name : "NULL");
             ImGui::TreePop();
diff --git a/imgui_internal.h b/imgui_internal.h
index 1cb723ca7..ccfc3bf47 100644
--- a/imgui_internal.h
+++ b/imgui_internal.h
@@ -429,8 +429,10 @@ struct ImGuiContext
     ImGuiID                 HoveredId;                          // Hovered widget
     bool                    HoveredIdAllowOverlap;
     ImGuiID                 HoveredIdPreviousFrame;
+    float                   HoveredIdTimer;
     ImGuiID                 ActiveId;                           // Active widget
     ImGuiID                 ActiveIdPreviousFrame;
+    float                   ActiveIdTimer;
     bool                    ActiveIdIsAlive;                    // Active widget has been seen this frame
     bool                    ActiveIdIsJustActivated;            // Set at the time of activation for one frame
     bool                    ActiveIdAllowOverlap;               // Active widget allows another widget to steal active id (generally for overlapping widgets, but not always)
@@ -521,8 +523,10 @@ struct ImGuiContext
         HoveredId = 0;
         HoveredIdAllowOverlap = false;
         HoveredIdPreviousFrame = 0;
+        HoveredIdTimer = 0.0f;
         ActiveId = 0;
         ActiveIdPreviousFrame = 0;
+        ActiveIdTimer = 0.0f;
         ActiveIdIsAlive = false;
         ActiveIdIsJustActivated = false;
         ActiveIdAllowOverlap = false;