Drag and Drop: Added payload->IsPreview() to user can render their custom preview while handling overlapping drop targets. (#143)
diff --git a/imgui.cpp b/imgui.cpp
index b43295e..3eecc73 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -10836,7 +10836,8 @@
}
// Render default drop visuals
- if (!(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect) && was_accepted_previously)
+ 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);
diff --git a/imgui.h b/imgui.h
index 1624e31..7959d0e 100644
--- a/imgui.h
+++ b/imgui.h
@@ -1155,11 +1155,13 @@
ImGuiID SourceParentId; // Source parent id (if available)
int DataFrameCount; // Data timestamp
char DataType[8 + 1]; // Data type tag (short user-supplied string)
- bool Delivery; // Set when AcceptDragDropPayload() was called and the mouse button is released over the target item
+ bool Preview; // Set when AcceptDragDropPayload() was called and mouse has been hovering the target item (nb: handle overlapping drag targets)
+ bool Delivery; // Set when AcceptDragDropPayload() was called and mouse button is released over the target item.
ImGuiPayload() { Clear(); }
- void Clear() { SourceId = SourceParentId = 0; Data = NULL; DataSize = 0; memset(DataType, 0, sizeof(DataType)); DataFrameCount = -1; Delivery = false; }
+ void Clear() { SourceId = SourceParentId = 0; Data = NULL; DataSize = 0; memset(DataType, 0, sizeof(DataType)); DataFrameCount = -1; Preview = Delivery = false; }
bool IsDataType(const char* type) const { return DataFrameCount != -1 && strcmp(type, DataType) == 0; }
+ bool IsPreview() const { return Preview; }
bool IsDelivery() const { return Delivery; }
};
