Drag and Drop: Added ImGuiCol_DragDropTarget (#143, #707)

imgui.cpp

@@ -5454,6 +5454,7 @@ const char* ImGui::GetStyleColorName(ImGuiCol idx)
     case ImGuiCol_PlotHistogramHovered: return "PlotHistogramHovered";
     case ImGuiCol_TextSelectedBg: return "TextSelectedBg";
     case ImGuiCol_ModalWindowDarkening: return "ModalWindowDarkening";
+    case ImGuiCol_DragDropTarget: return "DragDropTarget";
     }
     IM_ASSERT(0);
     return "Unknown";
@@ -11345,12 +11346,11 @@ const ImGuiPayload* ImGui::AcceptDragDropPayload(const char* type, ImGuiDragDrop
     payload.Preview = was_accepted_previously;
     if (!(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect) && payload.Preview)
     {
-        // FIXME-DRAG FIXME-STYLE: Settle on a proper default visuals for drop target, w/ ImGuiCol enum value probably.
-        r.Expand(5.0f);
+        // FIXME-DRAG: Settle on a proper default visuals for drop target.
+        r.Expand(3.5f);
         bool push_clip_rect = !window->ClipRect.Contains(r);
         if (push_clip_rect) window->DrawList->PushClipRectFullScreen();
-        window->DrawList->AddRectFilled(r.Min, r.Max, IM_COL32(255, 255, 0, 20), 0.0f);
-        window->DrawList->AddRect(r.Min + ImVec2(1.5f,1.5f), r.Max - ImVec2(1.5f,1.5f), IM_COL32(255, 255, 0, 255), 0.0f, ~0, 2.0f);
+        window->DrawList->AddRect(r.Min, r.Max, GetColorU32(ImGuiCol_DragDropTarget), 0.0f, ~0, 2.0f);
         if (push_clip_rect) window->DrawList->PopClipRect();
     }
 

imgui.h

@@ -719,6 +719,7 @@ enum ImGuiCol_
     ImGuiCol_PlotHistogramHovered,
     ImGuiCol_TextSelectedBg,
     ImGuiCol_ModalWindowDarkening,  // darken entire screen when a modal window is active
+    ImGuiCol_DragDropTarget,
     ImGuiCol_COUNT
 
     // Obsolete names (will be removed)

imgui_draw.cpp

@@ -171,6 +171,7 @@ void ImGui::StyleColorsClassic(ImGuiStyle* dst)
     colors[ImGuiCol_PlotHistogramHovered]   = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
     colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.00f, 0.00f, 1.00f, 0.35f);
     colors[ImGuiCol_ModalWindowDarkening]   = ImVec4(0.20f, 0.20f, 0.20f, 0.35f);
+    colors[ImGuiCol_DragDropTarget]         = ImVec4(1.00f, 1.00f, 0.00f, 0.90f);
 }
 
 void ImGui::StyleColorsDark(ImGuiStyle* dst)
@@ -220,6 +221,7 @@ void ImGui::StyleColorsDark(ImGuiStyle* dst)
     colors[ImGuiCol_PlotHistogramHovered]   = ImVec4(1.00f, 0.60f, 0.00f, 1.00f);
     colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
     colors[ImGuiCol_ModalWindowDarkening]   = ImVec4(0.80f, 0.80f, 0.80f, 0.35f);
+    colors[ImGuiCol_DragDropTarget]         = ImVec4(1.00f, 1.00f, 0.00f, 0.90f);
 }
 
 void ImGui::StyleColorsLight(ImGuiStyle* dst)
@@ -271,9 +273,9 @@ void ImGui::StyleColorsLight(ImGuiStyle* dst)
     colors[ImGuiCol_PlotHistogramHovered]   = ImVec4(1.00f, 0.45f, 0.00f, 1.00f);
     colors[ImGuiCol_TextSelectedBg]         = ImVec4(0.26f, 0.59f, 0.98f, 0.35f);
     colors[ImGuiCol_ModalWindowDarkening]   = ImVec4(0.20f, 0.20f, 0.20f, 0.35f);
+    colors[ImGuiCol_DragDropTarget]         = ImVec4(0.26f, 0.59f, 0.98f, 0.95f);
 }
 
-
 //-----------------------------------------------------------------------------
 // ImDrawList
 //-----------------------------------------------------------------------------