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Drag and Drop: added BeginDragDropTargetViewport(), still in imgui_internal.h for now. (#5204)

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ocornut
2025-10-03 19:04:37 +02:00
parent 1cdec11e24
commit 27a9374ef3
2 changed files with 38 additions and 1 deletions
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37
imgui.cpp
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@@ -4160,6 +4160,7 @@ ImGuiContext::ImGuiContext(ImFontAtlas* shared_font_atlas)
DragDropSourceFrameCount = -1;
DragDropMouseButton = -1;
DragDropTargetId = 0;
DragDropTargetFullViewport = 0;
DragDropAcceptFlags = ImGuiDragDropFlags_None;
DragDropAcceptIdCurrRectSurface = 0.0f;
DragDropAcceptIdPrev = DragDropAcceptIdCurr = 0;
@@ -14722,6 +14723,31 @@ bool ImGui::BeginDragDropTargetCustom(const ImRect& bb, ImGuiID id)
g.DragDropTargetRect = bb;
g.DragDropTargetClipRect = window->ClipRect; // May want to be overridden by user depending on use case?
g.DragDropTargetId = id;
g.DragDropTargetFullViewport = 0;
g.DragDropWithinTarget = true;
return true;
}
// Typical usage would be:
// if (!ImGui::IsWindowHovered(ImGuiHoveredFlags_AnyWindow | ImGuiHoveredFlags_AllowWhenBlockedByActiveItem))
// if (ImGui::BeginDragDropTargetViewport(ImGui::GetMainViewport(), NULL))
// But we are leaving the hover test to the caller for maximum flexibility.
bool ImGui::BeginDragDropTargetViewport(ImGuiViewport* viewport, const ImRect* p_bb)
{
ImGuiContext& g = *GImGui;
if (!g.DragDropActive)
return false;
ImRect bb = p_bb ? *p_bb : ((ImGuiViewportP*)viewport)->GetWorkRect();
ImGuiID id = viewport->ID;
if (!IsMouseHoveringRect(bb.Min, bb.Max, false) || (id == g.DragDropPayload.SourceId))
return false;
IM_ASSERT(g.DragDropWithinTarget == false && g.DragDropWithinSource == false); // Can't nest BeginDragDropSource() and BeginDragDropTarget()
g.DragDropTargetRect = bb;
g.DragDropTargetClipRect = bb;
g.DragDropTargetId = id;
g.DragDropTargetFullViewport = id;
g.DragDropWithinTarget = true;
return true;
}
@@ -14792,8 +14818,17 @@ const ImGuiPayload* ImGui::AcceptDragDropPayload(const char* type, ImGuiDragDrop
// Render default drop visuals
payload.Preview = was_accepted_previously;
flags |= (g.DragDropSourceFlags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect); // Source can also inhibit the preview (useful for external sources that live for 1 frame)
if (!(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect) && payload.Preview)
const bool draw_target_rect = payload.Preview && !(flags & ImGuiDragDropFlags_AcceptNoDrawDefaultRect);
if (draw_target_rect && g.DragDropTargetFullViewport != 0)
{
ImRect bb = g.DragDropTargetRect;
bb.Expand(-3.5f);
RenderDragDropTargetRectEx(GetForegroundDrawList(), bb);
}
else if (draw_target_rect)
{
RenderDragDropTargetRectForItem(r);
}
g.DragDropAcceptFrameCount = g.FrameCount;
if ((g.DragDropSourceFlags & ImGuiDragDropFlags_SourceExtern) && g.DragDropMouseButton == -1)

2
imgui_internal.h
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@@ -2372,6 +2372,7 @@ struct ImGuiContext
ImRect DragDropTargetRect; // Store rectangle of current target candidate (we favor small targets when overlapping)
ImRect DragDropTargetClipRect; // Store ClipRect at the time of item's drawing
ImGuiID DragDropTargetId;
ImGuiID DragDropTargetFullViewport;
ImGuiDragDropFlags DragDropAcceptFlags;
float DragDropAcceptIdCurrRectSurface; // Target item surface (we resolve overlapping targets by prioritizing the smaller surface)
ImGuiID DragDropAcceptIdCurr; // Target item id (set at the time of accepting the payload)
@@ -3421,6 +3422,7 @@ namespace ImGui
// Drag and Drop
IMGUI_API bool IsDragDropActive();
IMGUI_API bool BeginDragDropTargetCustom(const ImRect& bb, ImGuiID id);
IMGUI_API bool BeginDragDropTargetViewport(ImGuiViewport* viewport, const ImRect* p_bb = NULL);
IMGUI_API void ClearDragDrop();
IMGUI_API bool IsDragDropPayloadBeingAccepted();
IMGUI_API void RenderDragDropTargetRectForItem(const ImRect& bb);