Plot: Register an ID to take the click the same way as other framed widgets. Set HoveredId in the FramePadding zone (between inner_bb and frame_bb).

Author: ocornut

imgui_internal.h

@@ -1493,7 +1493,7 @@ namespace ImGui
     IMGUI_API void          ColorPickerOptionsPopup(const float* ref_col, ImGuiColorEditFlags flags);
 
     // Plot
-    IMGUI_API void          PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset, const char* overlay_text, float scale_min, float scale_max, ImVec2 graph_size);
+    IMGUI_API void          PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset, const char* overlay_text, float scale_min, float scale_max, ImVec2 frame_size);
 
     // Shade functions (write over already created vertices)
     IMGUI_API void          ShadeVertsLinearColorGradientKeepAlpha(ImDrawList* draw_list, int vert_start_idx, int vert_end_idx, ImVec2 gradient_p0, ImVec2 gradient_p1, ImU32 col0, ImU32 col1);

imgui_widgets.cpp

@@ -5214,28 +5214,29 @@ bool ImGui::ListBox(const char* label, int* current_item, bool (*items_getter)(v
 // - PlotHistogram()
 //-------------------------------------------------------------------------
 
-void ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset, const char* overlay_text, float scale_min, float scale_max, ImVec2 graph_size)
+void ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset, const char* overlay_text, float scale_min, float scale_max, ImVec2 frame_size)
 {
     ImGuiWindow* window = GetCurrentWindow();
     if (window->SkipItems)
         return;
 
     ImGuiContext& g = *GImGui;
     const ImGuiStyle& style = g.Style;
+    const ImGuiID id = window->GetID(label);
 
     const ImVec2 label_size = CalcTextSize(label, NULL, true);
-    if (graph_size.x == 0.0f)
-        graph_size.x = CalcItemWidth();
-    if (graph_size.y == 0.0f)
-        graph_size.y = label_size.y + (style.FramePadding.y * 2);
+    if (frame_size.x == 0.0f)
+        frame_size.x = CalcItemWidth();
+    if (frame_size.y == 0.0f)
+        frame_size.y = label_size.y + (style.FramePadding.y * 2);
 
-    const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + ImVec2(graph_size.x, graph_size.y));
+    const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + frame_size);
     const ImRect inner_bb(frame_bb.Min + style.FramePadding, frame_bb.Max - style.FramePadding);
     const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0));
     ItemSize(total_bb, style.FramePadding.y);
     if (!ItemAdd(total_bb, 0, &frame_bb))
         return;
-    const bool hovered = ItemHoverable(inner_bb, 0);
+    const bool hovered = ItemHoverable(frame_bb, id);
 
     // Determine scale from values if not specified
     if (scale_min == FLT_MAX || scale_max == FLT_MAX)
@@ -5258,12 +5259,12 @@ void ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_ge
 
     if (values_count > 0)
     {
-        int res_w = ImMin((int)graph_size.x, values_count) + ((plot_type == ImGuiPlotType_Lines) ? -1 : 0);
+        int res_w = ImMin((int)frame_size.x, values_count) + ((plot_type == ImGuiPlotType_Lines) ? -1 : 0);
         int item_count = values_count + ((plot_type == ImGuiPlotType_Lines) ? -1 : 0);
 
         // Tooltip on hover
         int v_hovered = -1;
-        if (hovered)
+        if (hovered && inner_bb.Contains(g.IO.MousePos))
         {
             const float t = ImClamp((g.IO.MousePos.x - inner_bb.Min.x) / (inner_bb.Max.x - inner_bb.Min.x), 0.0f, 0.9999f);
             const int v_idx = (int)(t * item_count);