WIP: tabs, docking, dragdrop, settings, logging, harness
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4DBug
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--- ImGui Sincerely
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-- Drag and drop: 1:1 port of imgui.cpp [SECTION] DRAG AND DROP (docking branch)
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-- Payload `Data` is any Lua value (no copy is made). `data_size` is optional and only kept for API parity.
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function ImGui.IsDragDropActive()
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return ImGui.GetCurrentContext().DragDropActive
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end
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function ImGui.ClearDragDrop()
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local g = ImGui.GetCurrentContext()
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g.DragDropActive = false
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ImGuiPayload_Clear(g.DragDropPayload)
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g.DragDropAcceptFlagsCurr = ImGuiDragDropFlags.None
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g.DragDropAcceptIdCurr = 0
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g.DragDropAcceptIdPrev = 0
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g.DragDropAcceptIdCurrRectSurface = FLT_MAX
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g.DragDropAcceptFrameCount = -1
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end
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function ImGui.BeginDragDropSource(flags)
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if flags == nil then flags = 0 end
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local g = ImGui.GetCurrentContext()
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local window = g.CurrentWindow
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local mouse_button = ImGuiMouseButton.Left
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local source_drag_active = false
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local source_id = 0
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local source_parent_id = 0
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if bit32.band(flags, ImGuiDragDropFlags.SourceExtern) == 0 then
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source_id = g.LastItemData.ID
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if source_id ~= 0 then
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if g.ActiveId ~= source_id then return false end
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if g.ActiveIdMouseButton ~= -1 then mouse_button = g.ActiveIdMouseButton end
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if g.IO.MouseDown[mouse_button] == false or window.SkipItems then return false end
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g.ActiveIdAllowOverlap = false
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else
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if g.IO.MouseDown[mouse_button] == false or window.SkipItems then return false end
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if bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredRect) == 0 and (g.ActiveId == 0 or g.ActiveIdWindow ~= window) then
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return false
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end
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if bit32.band(flags, ImGuiDragDropFlags.SourceAllowNullID) == 0 then
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IM_ASSERT(false, "Use ImGuiDragDropFlags.SourceAllowNullID for items without an ID")
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return false
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end
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source_id = window:GetIDFromRectangle(g.LastItemData.Rect)
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g.LastItemData.ID = source_id
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ImGui.KeepAliveID(source_id)
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local is_hovered = ImGui.ItemHoverable(g.LastItemData.Rect, source_id, g.LastItemData.ItemFlags)
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if is_hovered and g.IO.MouseClicked[mouse_button] then
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ImGui.SetActiveID(source_id, window)
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ImGui.FocusWindow(window)
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end
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if g.ActiveId == source_id then g.ActiveIdAllowOverlap = is_hovered end
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end
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if g.ActiveId ~= source_id then return false end
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source_parent_id = window.IDStack.Data[window.IDStack.Size]
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source_drag_active = ImGui.IsMouseDragging(mouse_button)
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ImGui.SetActiveIdUsingAllKeyboardKeys()
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else
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window = nil
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source_id = ImHashStr("#SourceExtern")
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source_drag_active = true
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mouse_button = g.IO.MouseDown[0] and 0 or -1
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ImGui.KeepAliveID(source_id)
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ImGui.SetActiveID(source_id, nil)
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end
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IM_ASSERT(g.DragDropWithinTarget == false)
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if not source_drag_active then return false end
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if not g.DragDropActive then
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IM_ASSERT(source_id ~= 0)
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ImGui.ClearDragDrop()
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local payload = g.DragDropPayload
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payload.SourceId = source_id
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payload.SourceParentId = source_parent_id
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g.DragDropActive = true
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g.DragDropSourceFlags = flags
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g.DragDropMouseButton = mouse_button
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if payload.SourceId == g.ActiveId then g.ActiveIdNoClearOnFocusLoss = true end
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end
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g.DragDropSourceFrameCount = g.FrameCount
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g.DragDropWithinSource = true
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if bit32.band(flags, ImGuiDragDropFlags.SourceNoPreviewTooltip) == 0 then
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local ret
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if g.DragDropAcceptIdPrev ~= 0 and bit32.band(g.DragDropAcceptFlagsPrev, ImGuiDragDropFlags.AcceptNoPreviewTooltip) ~= 0 then
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ret = ImGui.BeginTooltipHidden()
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else
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ret = ImGui.BeginTooltip()
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end
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IM_ASSERT(ret)
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end
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if bit32.band(flags, ImGuiDragDropFlags.SourceNoDisableHover) == 0 and bit32.band(flags, ImGuiDragDropFlags.SourceExtern) == 0 then
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g.LastItemData.StatusFlags = bit32.band(g.LastItemData.StatusFlags, bit32.bnot(ImGuiItemStatusFlags.HoveredRect))
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end
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return true
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end
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function ImGui.EndDragDropSource()
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local g = ImGui.GetCurrentContext()
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IM_ASSERT(g.DragDropActive)
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IM_ASSERT(g.DragDropWithinSource, "Not after a BeginDragDropSource()?")
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if bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.SourceNoPreviewTooltip) == 0 then
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ImGui.EndTooltip()
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end
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if g.DragDropPayload.DataFrameCount == -1 then ImGui.ClearDragDrop() end
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g.DragDropWithinSource = false
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end
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--- @param data any # any Lua value
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--- @return bool accepted
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function ImGui.SetDragDropPayload(type, data, data_size, cond)
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local g = ImGui.GetCurrentContext()
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local payload = g.DragDropPayload
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if cond == nil or cond == 0 then cond = ImGuiCond.Always end
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IM_ASSERT(type ~= nil)
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IM_ASSERT(#type < 32, "Payload type can be at most 32 characters long")
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IM_ASSERT(cond == ImGuiCond.Always or cond == ImGuiCond.Once)
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IM_ASSERT(payload.SourceId ~= 0)
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if cond == ImGuiCond.Always or payload.DataFrameCount == -1 then
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payload.DataType = type
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payload.Data = data
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payload.DataSize = data_size or ((data ~= nil) and 1 or 0)
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end
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payload.DataFrameCount = g.FrameCount
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return (g.DragDropAcceptFrameCount == g.FrameCount) or (g.DragDropAcceptFrameCount == g.FrameCount - 1)
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end
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function ImGui.BeginDragDropTargetCustom(bb, id)
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local g = ImGui.GetCurrentContext()
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if not g.DragDropActive then return false end
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local window = g.CurrentWindow
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local hovered_window = g.HoveredWindowUnderMovingWindow
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if hovered_window == nil or window.RootWindowDockTree ~= hovered_window.RootWindowDockTree then return false end
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IM_ASSERT(id ~= 0)
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if not ImGui.IsMouseHoveringRect(bb.Min, bb.Max) or (id == g.DragDropPayload.SourceId) then return false end
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if window.SkipItems then return false end
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IM_ASSERT(g.DragDropWithinTarget == false and g.DragDropWithinSource == false)
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g.DragDropTargetRect = ImRect(bb.Min, bb.Max)
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g.DragDropTargetClipRect = ImRect(window.ClipRect.Min, window.ClipRect.Max)
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g.DragDropTargetId = id
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g.DragDropTargetFullViewport = 0
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g.DragDropWithinTarget = true
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return true
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end
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function ImGui.BeginDragDropTargetViewport(viewport, p_bb)
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local g = ImGui.GetCurrentContext()
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if not g.DragDropActive then return false end
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local bb = p_bb or viewport:GetWorkRect()
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local id = viewport.ID
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if g.MouseViewport ~= viewport or not ImGui.IsMouseHoveringRect(bb.Min, bb.Max, false) or (id == g.DragDropPayload.SourceId) then
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return false
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end
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IM_ASSERT(g.DragDropWithinTarget == false and g.DragDropWithinSource == false)
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g.DragDropTargetRect = ImRect(bb.Min, bb.Max)
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g.DragDropTargetClipRect = ImRect(bb.Min, bb.Max)
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g.DragDropTargetId = id
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g.DragDropTargetFullViewport = id
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g.DragDropWithinTarget = true
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return true
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end
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function ImGui.BeginDragDropTarget()
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local g = ImGui.GetCurrentContext()
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if not g.DragDropActive then return false end
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local window = g.CurrentWindow
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if bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredRect) == 0 then return false end
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local hovered_window = g.HoveredWindowUnderMovingWindow
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if hovered_window == nil or window.RootWindowDockTree ~= hovered_window.RootWindowDockTree or window.SkipItems then return false end
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local display_rect = (bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasDisplayRect) ~= 0) and g.LastItemData.DisplayRect or g.LastItemData.Rect
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local id = g.LastItemData.ID
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if id == 0 then
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id = window:GetIDFromRectangle(display_rect)
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ImGui.KeepAliveID(id)
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end
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if g.DragDropPayload.SourceId == id then return false end
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IM_ASSERT(g.DragDropWithinTarget == false and g.DragDropWithinSource == false)
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g.DragDropTargetRect = ImRect(display_rect.Min, display_rect.Max)
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local clip = (bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasClipRect) ~= 0) and g.LastItemData.ClipRect or window.ClipRect
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g.DragDropTargetClipRect = ImRect(clip.Min, clip.Max)
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g.DragDropTargetId = id
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g.DragDropWithinTarget = true
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return true
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end
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function ImGui.IsDragDropPayloadBeingAccepted()
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local g = ImGui.GetCurrentContext()
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return g.DragDropActive and g.DragDropAcceptIdPrev ~= 0
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end
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--- @return ImGuiPayload?
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function ImGui.AcceptDragDropPayload(type, flags)
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if flags == nil then flags = 0 end
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local g = ImGui.GetCurrentContext()
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local payload = g.DragDropPayload
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IM_ASSERT(g.DragDropActive)
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IM_ASSERT(payload.DataFrameCount ~= -1)
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if type ~= nil and not ImGuiPayload_IsDataType(payload, type) then return nil end
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local was_accepted_previously = (g.DragDropAcceptIdPrev == g.DragDropTargetId)
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local r = g.DragDropTargetRect
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local r_surface = r:GetWidth() * r:GetHeight()
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if r_surface > g.DragDropAcceptIdCurrRectSurface then return nil end
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g.DragDropAcceptFlagsCurr = flags
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g.DragDropAcceptIdCurr = g.DragDropTargetId
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g.DragDropAcceptIdCurrRectSurface = r_surface
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payload.Preview = was_accepted_previously
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flags = bit32.bor(flags, bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.AcceptNoDrawDefaultRect))
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local draw_target_rect = payload.Preview and bit32.band(flags, ImGuiDragDropFlags.AcceptNoDrawDefaultRect) == 0
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if draw_target_rect and g.DragDropTargetFullViewport ~= 0 then
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ImGui.RenderDragDropTargetRectForViewport(g.DragDropTargetFullViewport, g.DragDropTargetRect)
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elseif draw_target_rect then
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ImGui.RenderDragDropTargetRectForItem(r)
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end
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g.DragDropAcceptFrameCount = g.FrameCount
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if bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.SourceExtern) ~= 0 and g.DragDropMouseButton == -1 then
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payload.Delivery = was_accepted_previously and (g.DragDropSourceFrameCount < g.FrameCount)
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else
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payload.Delivery = was_accepted_previously and not ImGui.IsMouseDown(g.DragDropMouseButton)
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end
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if not payload.Delivery and bit32.band(flags, ImGuiDragDropFlags.AcceptBeforeDelivery) == 0 then return nil end
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return payload
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end
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function ImGui.RenderDragDropTargetRectForItem(bb)
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local g = ImGui.GetCurrentContext()
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local window = g.CurrentWindow
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local bb_display = ImRect(bb.Min, bb.Max)
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bb_display:ClipWith(g.DragDropTargetClipRect)
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bb_display:Expand(g.Style.DragDropTargetPadding)
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local push_clip_rect = not window.ClipRect:Contains(bb_display)
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if push_clip_rect then window.DrawList:PushClipRectFullScreen() end
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ImGui.RenderDragDropTargetRectEx(window.DrawList, bb_display, g.Style.DragDropTargetRounding)
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if push_clip_rect then window.DrawList:PopClipRect() end
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end
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function ImGui.RenderDragDropTargetRectForViewport(viewport_id, bb)
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local g = ImGui.GetCurrentContext()
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local viewport = ImGui.FindViewportByID(viewport_id)
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IM_ASSERT(viewport ~= nil)
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local bb_padded = ImRect(bb.Min, bb.Max)
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bb_padded:Expand(-g.Style.DragDropTargetPadding)
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ImGui.RenderDragDropTargetRectEx(ImGui.GetForegroundDrawList(viewport), bb_padded, g.Style.DragDropTargetRounding)
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end
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function ImGui.RenderDragDropTargetRectEx(draw_list, bb, rounding)
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local g = ImGui.GetCurrentContext()
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draw_list:AddRectFilled(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.DragDropTargetBg), rounding, 0)
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draw_list:AddRect(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.DragDropTarget), rounding, 0, g.Style.DragDropTargetBorderSize)
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end
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--- @return ImGuiPayload?
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function ImGui.GetDragDropPayload()
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local g = ImGui.GetCurrentContext()
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return (g.DragDropActive and g.DragDropPayload.DataFrameCount ~= -1) and g.DragDropPayload or nil
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end
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function ImGui.EndDragDropTarget()
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local g = ImGui.GetCurrentContext()
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IM_ASSERT(g.DragDropActive)
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IM_ASSERT(g.DragDropWithinTarget)
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g.DragDropWithinTarget = false
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if g.DragDropPayload.Delivery then ImGui.ClearDragDrop() end
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end
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-- Payload methods (C++ ImGuiPayload members): payload:IsDataType(t) etc. also work through these globals
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function ImGui.PayloadIsDataType(payload, t) return ImGuiPayload_IsDataType(payload, t) end
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return true
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