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imgui_node_editor.h
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//------------------------------------------------------------------------------
// VERSION 0.9.1
//
// LICENSE
// This software is dual-licensed to the public domain and under the following
// license: you are granted a perpetual, irrevocable license to copy, modify,
// publish, and distribute this file as you see fit.
//
// CREDITS
// Written by Michal Cichon
//------------------------------------------------------------------------------
# ifndef __IMGUI_NODE_EDITOR_H__
# define __IMGUI_NODE_EDITOR_H__
# pragma once
//------------------------------------------------------------------------------
#define IMGUI_DEFINE_MATH_OPERATORS
# include <imgui.h>
# include <cstdint> // std::uintXX_t
# include <utility> // std::move
//------------------------------------------------------------------------------
# define IMGUI_NODE_EDITOR_VERSION "0.9.4"
# define IMGUI_NODE_EDITOR_VERSION_NUM 000904
//------------------------------------------------------------------------------
#ifndef IMGUI_NODE_EDITOR_API
#define IMGUI_NODE_EDITOR_API
#endif
//------------------------------------------------------------------------------
namespace ax {
namespace NodeEditor {
//------------------------------------------------------------------------------
struct NodeId;
struct LinkId;
struct PinId;
//------------------------------------------------------------------------------
enum class PinKind
{
Input,
Output
};
enum class FlowDirection
{
Forward,
Backward
};
enum class CanvasSizeMode
{
FitVerticalView, // Previous view will be scaled to fit new view on Y axis
FitHorizontalView, // Previous view will be scaled to fit new view on X axis
CenterOnly, // Previous view will be centered on new view
};
//------------------------------------------------------------------------------
enum class SaveReasonFlags: uint32_t
{
None = 0x00000000,
Navigation = 0x00000001,
Position = 0x00000002,
Size = 0x00000004,
Selection = 0x00000008,
AddNode = 0x00000010,
RemoveNode = 0x00000020,
User = 0x00000040
};
inline SaveReasonFlags operator |(SaveReasonFlags lhs, SaveReasonFlags rhs) { return static_cast<SaveReasonFlags>(static_cast<uint32_t>(lhs) | static_cast<uint32_t>(rhs)); }
inline SaveReasonFlags operator &(SaveReasonFlags lhs, SaveReasonFlags rhs) { return static_cast<SaveReasonFlags>(static_cast<uint32_t>(lhs) & static_cast<uint32_t>(rhs)); }
using ConfigSaveSettings = bool (*)(const char* data, size_t size, SaveReasonFlags reason, void* userPointer);
using ConfigLoadSettings = size_t (*)(char* data, void* userPointer);
using ConfigSaveNodeSettings = bool (*)(NodeId nodeId, const char* data, size_t size, SaveReasonFlags reason, void* userPointer);
using ConfigLoadNodeSettings = size_t (*)(NodeId nodeId, char* data, void* userPointer);
using ConfigSession = void (*)(void* userPointer);
struct Config
{
using CanvasSizeModeAlias = ax::NodeEditor::CanvasSizeMode;
const char* SettingsFile;
ConfigSession BeginSaveSession;
ConfigSession EndSaveSession;
ConfigSaveSettings SaveSettings;
ConfigLoadSettings LoadSettings;
ConfigSaveNodeSettings SaveNodeSettings;
ConfigLoadNodeSettings LoadNodeSettings;
void* UserPointer;
ImVector<float> CustomZoomLevels;
CanvasSizeModeAlias CanvasSizeMode;
int DragButtonIndex; // Mouse button index drag action will react to (0-left, 1-right, 2-middle)
int SelectButtonIndex; // Mouse button index select action will react to (0-left, 1-right, 2-middle)
int NavigateButtonIndex; // Mouse button index navigate action will react to (0-left, 1-right, 2-middle)
int ContextMenuButtonIndex; // Mouse button index context menu action will react to (0-left, 1-right, 2-middle)
bool EnableSmoothZoom;
float SmoothZoomPower;
Config()
: SettingsFile("NodeEditor.json")
, BeginSaveSession(nullptr)
, EndSaveSession(nullptr)
, SaveSettings(nullptr)
, LoadSettings(nullptr)
, SaveNodeSettings(nullptr)
, LoadNodeSettings(nullptr)
, UserPointer(nullptr)
, CustomZoomLevels()
, CanvasSizeMode(CanvasSizeModeAlias::FitVerticalView)
, DragButtonIndex(0)
, SelectButtonIndex(0)
, NavigateButtonIndex(1)
, ContextMenuButtonIndex(1)
, EnableSmoothZoom(false)
# ifdef __APPLE__
, SmoothZoomPower(1.1f)
# else
, SmoothZoomPower(1.3f)
# endif
{
}
};
//------------------------------------------------------------------------------
enum StyleColor
{
StyleColor_Bg,
StyleColor_Grid,
StyleColor_NodeBg,
StyleColor_NodeBorder,
StyleColor_HovNodeBorder,
StyleColor_SelNodeBorder,
StyleColor_NodeSelRect,
StyleColor_NodeSelRectBorder,
StyleColor_HovLinkBorder,
StyleColor_SelLinkBorder,
StyleColor_HighlightLinkBorder,
StyleColor_LinkSelRect,
StyleColor_LinkSelRectBorder,
StyleColor_PinRect,
StyleColor_PinRectBorder,
StyleColor_Flow,
StyleColor_FlowMarker,
StyleColor_GroupBg,
StyleColor_GroupBorder,
StyleColor_Count
};
enum StyleVar
{
StyleVar_NodePadding,
StyleVar_NodeRounding,
StyleVar_NodeBorderWidth,
StyleVar_HoveredNodeBorderWidth,
StyleVar_SelectedNodeBorderWidth,
StyleVar_PinRounding,
StyleVar_PinBorderWidth,
StyleVar_LinkStrength,
StyleVar_SourceDirection,
StyleVar_TargetDirection,
StyleVar_ScrollDuration,
StyleVar_FlowMarkerDistance,
StyleVar_FlowSpeed,
StyleVar_FlowDuration,
StyleVar_PivotAlignment,
StyleVar_PivotSize,
StyleVar_PivotScale,
StyleVar_PinCorners,
StyleVar_PinRadius,
StyleVar_PinArrowSize,
StyleVar_PinArrowWidth,
StyleVar_GroupRounding,
StyleVar_GroupBorderWidth,
StyleVar_HighlightConnectedLinks,
StyleVar_SnapLinkToPinDir,
StyleVar_HoveredNodeBorderOffset,
StyleVar_SelectedNodeBorderOffset,
StyleVar_Count
};
struct Style
{
ImVec4 NodePadding;
float NodeRounding;
float NodeBorderWidth;
float HoveredNodeBorderWidth;
float HoverNodeBorderOffset;
float SelectedNodeBorderWidth;
float SelectedNodeBorderOffset;
float PinRounding;
float PinBorderWidth;
float LinkStrength;
ImVec2 SourceDirection;
ImVec2 TargetDirection;
float ScrollDuration;
float FlowMarkerDistance;
float FlowSpeed;
float FlowDuration;
ImVec2 PivotAlignment;
ImVec2 PivotSize;
ImVec2 PivotScale;
float PinCorners;
float PinRadius;
float PinArrowSize;
float PinArrowWidth;
float GroupRounding;
float GroupBorderWidth;
float HighlightConnectedLinks;
float SnapLinkToPinDir; // when true link will start on the line defined by pin direction
ImVec4 Colors[StyleColor_Count];
Style()
{
NodePadding = ImVec4(8, 8, 8, 8);
NodeRounding = 12.0f;
NodeBorderWidth = 1.5f;
HoveredNodeBorderWidth = 3.5f;
HoverNodeBorderOffset = 0.0f;
SelectedNodeBorderWidth = 3.5f;
SelectedNodeBorderOffset = 0.0f;
PinRounding = 4.0f;
PinBorderWidth = 0.0f;
LinkStrength = 100.0f;
SourceDirection = ImVec2(1.0f, 0.0f);
TargetDirection = ImVec2(-1.0f, 0.0f);
ScrollDuration = 0.35f;
FlowMarkerDistance = 30.0f;
FlowSpeed = 150.0f;
FlowDuration = 2.0f;
PivotAlignment = ImVec2(0.5f, 0.5f);
PivotSize = ImVec2(0.0f, 0.0f);
PivotScale = ImVec2(1, 1);
#if IMGUI_VERSION_NUM > 18101
PinCorners = ImDrawFlags_RoundCornersAll;
#else
PinCorners = ImDrawCornerFlags_All;
#endif
PinRadius = 0.0f;
PinArrowSize = 0.0f;
PinArrowWidth = 0.0f;
GroupRounding = 6.0f;
GroupBorderWidth = 1.0f;
HighlightConnectedLinks = 0.0f;
SnapLinkToPinDir = 0.0f;
Colors[StyleColor_Bg] = ImColor( 60, 60, 70, 200);
Colors[StyleColor_Grid] = ImColor(120, 120, 120, 40);
Colors[StyleColor_NodeBg] = ImColor( 32, 32, 32, 200);
Colors[StyleColor_NodeBorder] = ImColor(255, 255, 255, 96);
Colors[StyleColor_HovNodeBorder] = ImColor( 50, 176, 255, 255);
Colors[StyleColor_SelNodeBorder] = ImColor(255, 176, 50, 255);
Colors[StyleColor_NodeSelRect] = ImColor( 5, 130, 255, 64);
Colors[StyleColor_NodeSelRectBorder] = ImColor( 5, 130, 255, 128);
Colors[StyleColor_HovLinkBorder] = ImColor( 50, 176, 255, 255);
Colors[StyleColor_SelLinkBorder] = ImColor(255, 176, 50, 255);
Colors[StyleColor_HighlightLinkBorder]= ImColor(204, 105, 0, 255);
Colors[StyleColor_LinkSelRect] = ImColor( 5, 130, 255, 64);
Colors[StyleColor_LinkSelRectBorder] = ImColor( 5, 130, 255, 128);
Colors[StyleColor_PinRect] = ImColor( 60, 180, 255, 100);
Colors[StyleColor_PinRectBorder] = ImColor( 60, 180, 255, 128);
Colors[StyleColor_Flow] = ImColor(255, 128, 64, 255);
Colors[StyleColor_FlowMarker] = ImColor(255, 128, 64, 255);
Colors[StyleColor_GroupBg] = ImColor( 0, 0, 0, 160);
Colors[StyleColor_GroupBorder] = ImColor(255, 255, 255, 32);
}
};
//------------------------------------------------------------------------------
struct EditorContext;
//------------------------------------------------------------------------------
IMGUI_NODE_EDITOR_API void SetCurrentEditor(EditorContext* ctx);
IMGUI_NODE_EDITOR_API EditorContext* GetCurrentEditor();
IMGUI_NODE_EDITOR_API EditorContext* CreateEditor(const Config* config = nullptr);
IMGUI_NODE_EDITOR_API void DestroyEditor(EditorContext* ctx);
IMGUI_NODE_EDITOR_API const Config& GetConfig(EditorContext* ctx = nullptr);
IMGUI_NODE_EDITOR_API Style& GetStyle();
IMGUI_NODE_EDITOR_API const char* GetStyleColorName(StyleColor colorIndex);
IMGUI_NODE_EDITOR_API void PushStyleColor(StyleColor colorIndex, const ImVec4& color);
IMGUI_NODE_EDITOR_API void PopStyleColor(int count = 1);
IMGUI_NODE_EDITOR_API void PushStyleVar(StyleVar varIndex, float value);
IMGUI_NODE_EDITOR_API void PushStyleVar(StyleVar varIndex, const ImVec2& value);
IMGUI_NODE_EDITOR_API void PushStyleVar(StyleVar varIndex, const ImVec4& value);
IMGUI_NODE_EDITOR_API void PopStyleVar(int count = 1);
IMGUI_NODE_EDITOR_API void Begin(const char* id, const ImVec2& size = ImVec2(0, 0));
IMGUI_NODE_EDITOR_API void End();
IMGUI_NODE_EDITOR_API void BeginNode(NodeId id);
IMGUI_NODE_EDITOR_API void BeginPin(PinId id, PinKind kind);
IMGUI_NODE_EDITOR_API void PinRect(const ImVec2& a, const ImVec2& b);
IMGUI_NODE_EDITOR_API void PinPivotRect(const ImVec2& a, const ImVec2& b);
IMGUI_NODE_EDITOR_API void PinPivotSize(const ImVec2& size);
IMGUI_NODE_EDITOR_API void PinPivotScale(const ImVec2& scale);
IMGUI_NODE_EDITOR_API void PinPivotAlignment(const ImVec2& alignment);
IMGUI_NODE_EDITOR_API void EndPin();
IMGUI_NODE_EDITOR_API void Group(const ImVec2& size);
IMGUI_NODE_EDITOR_API void EndNode();
IMGUI_NODE_EDITOR_API bool BeginGroupHint(NodeId nodeId);
IMGUI_NODE_EDITOR_API ImVec2 GetGroupMin();
IMGUI_NODE_EDITOR_API ImVec2 GetGroupMax();
IMGUI_NODE_EDITOR_API ImDrawList* GetHintForegroundDrawList();
IMGUI_NODE_EDITOR_API ImDrawList* GetHintBackgroundDrawList();
IMGUI_NODE_EDITOR_API void EndGroupHint();
// TODO: Add a way to manage node background channels
IMGUI_NODE_EDITOR_API ImDrawList* GetNodeBackgroundDrawList(NodeId nodeId);
IMGUI_NODE_EDITOR_API bool Link(LinkId id, PinId startPinId, PinId endPinId, const ImVec4& color = ImVec4(1, 1, 1, 1), float thickness = 1.0f);
IMGUI_NODE_EDITOR_API void Flow(LinkId linkId, FlowDirection direction = FlowDirection::Forward);
IMGUI_NODE_EDITOR_API bool BeginCreate(const ImVec4& color = ImVec4(1, 1, 1, 1), float thickness = 1.0f);
IMGUI_NODE_EDITOR_API bool QueryNewLink(PinId* startId, PinId* endId);
IMGUI_NODE_EDITOR_API bool QueryNewLink(PinId* startId, PinId* endId, const ImVec4& color, float thickness = 1.0f);
IMGUI_NODE_EDITOR_API bool QueryNewNode(PinId* pinId);
IMGUI_NODE_EDITOR_API bool QueryNewNode(PinId* pinId, const ImVec4& color, float thickness = 1.0f);
IMGUI_NODE_EDITOR_API bool AcceptNewItem();
IMGUI_NODE_EDITOR_API bool AcceptNewItem(const ImVec4& color, float thickness = 1.0f);
IMGUI_NODE_EDITOR_API void RejectNewItem();
IMGUI_NODE_EDITOR_API void RejectNewItem(const ImVec4& color, float thickness = 1.0f);
IMGUI_NODE_EDITOR_API void EndCreate();
IMGUI_NODE_EDITOR_API bool BeginDelete();
IMGUI_NODE_EDITOR_API bool QueryDeletedLink(LinkId* linkId, PinId* startId = nullptr, PinId* endId = nullptr);
IMGUI_NODE_EDITOR_API bool QueryDeletedNode(NodeId* nodeId);
IMGUI_NODE_EDITOR_API bool AcceptDeletedItem(bool deleteDependencies = true);
IMGUI_NODE_EDITOR_API void RejectDeletedItem();
IMGUI_NODE_EDITOR_API void EndDelete();
IMGUI_NODE_EDITOR_API void SetNodePosition(NodeId nodeId, const ImVec2& editorPosition);
IMGUI_NODE_EDITOR_API void SetGroupSize(NodeId nodeId, const ImVec2& size);
IMGUI_NODE_EDITOR_API ImVec2 GetNodePosition(NodeId nodeId);
IMGUI_NODE_EDITOR_API ImVec2 GetNodeSize(NodeId nodeId);
IMGUI_NODE_EDITOR_API void CenterNodeOnScreen(NodeId nodeId);
IMGUI_NODE_EDITOR_API void SetNodeZPosition(NodeId nodeId, float z); // Sets node z position, nodes with higher value are drawn over nodes with lower value
IMGUI_NODE_EDITOR_API float GetNodeZPosition(NodeId nodeId); // Returns node z position, defaults is 0.0f
IMGUI_NODE_EDITOR_API void RestoreNodeState(NodeId nodeId);
IMGUI_NODE_EDITOR_API void Suspend();
IMGUI_NODE_EDITOR_API void Resume();
IMGUI_NODE_EDITOR_API bool IsSuspended();
IMGUI_NODE_EDITOR_API bool IsActive();
IMGUI_NODE_EDITOR_API bool HasSelectionChanged();
IMGUI_NODE_EDITOR_API int GetSelectedObjectCount();
IMGUI_NODE_EDITOR_API int GetSelectedNodes(NodeId* nodes, int size);
IMGUI_NODE_EDITOR_API int GetSelectedLinks(LinkId* links, int size);
IMGUI_NODE_EDITOR_API bool IsNodeSelected(NodeId nodeId);
IMGUI_NODE_EDITOR_API bool IsLinkSelected(LinkId linkId);
IMGUI_NODE_EDITOR_API void ClearSelection();
IMGUI_NODE_EDITOR_API void SelectNode(NodeId nodeId, bool append = false);
IMGUI_NODE_EDITOR_API void SelectLink(LinkId linkId, bool append = false);
IMGUI_NODE_EDITOR_API void DeselectNode(NodeId nodeId);
IMGUI_NODE_EDITOR_API void DeselectLink(LinkId linkId);
IMGUI_NODE_EDITOR_API bool DeleteNode(NodeId nodeId);
IMGUI_NODE_EDITOR_API bool DeleteLink(LinkId linkId);
IMGUI_NODE_EDITOR_API bool HasAnyLinks(NodeId nodeId); // Returns true if node has any link connected
IMGUI_NODE_EDITOR_API bool HasAnyLinks(PinId pinId); // Return true if pin has any link connected
IMGUI_NODE_EDITOR_API int BreakLinks(NodeId nodeId); // Break all links connected to this node
IMGUI_NODE_EDITOR_API int BreakLinks(PinId pinId); // Break all links connected to this pin
IMGUI_NODE_EDITOR_API void NavigateToContent(float duration = -1);
IMGUI_NODE_EDITOR_API void NavigateToSelection(bool zoomIn = false, float duration = -1);
IMGUI_NODE_EDITOR_API bool ShowNodeContextMenu(NodeId* nodeId);
IMGUI_NODE_EDITOR_API bool ShowPinContextMenu(PinId* pinId);
IMGUI_NODE_EDITOR_API bool ShowLinkContextMenu(LinkId* linkId);
IMGUI_NODE_EDITOR_API bool ShowBackgroundContextMenu();
IMGUI_NODE_EDITOR_API void EnableShortcuts(bool enable);
IMGUI_NODE_EDITOR_API bool AreShortcutsEnabled();
IMGUI_NODE_EDITOR_API bool BeginShortcut();
IMGUI_NODE_EDITOR_API bool AcceptCut();
IMGUI_NODE_EDITOR_API bool AcceptCopy();
IMGUI_NODE_EDITOR_API bool AcceptPaste();
IMGUI_NODE_EDITOR_API bool AcceptDuplicate();
IMGUI_NODE_EDITOR_API bool AcceptCreateNode();
IMGUI_NODE_EDITOR_API int GetActionContextSize();
IMGUI_NODE_EDITOR_API int GetActionContextNodes(NodeId* nodes, int size);
IMGUI_NODE_EDITOR_API int GetActionContextLinks(LinkId* links, int size);
IMGUI_NODE_EDITOR_API void EndShortcut();
IMGUI_NODE_EDITOR_API float GetCurrentZoom();
IMGUI_NODE_EDITOR_API NodeId GetHoveredNode();
IMGUI_NODE_EDITOR_API PinId GetHoveredPin();
IMGUI_NODE_EDITOR_API LinkId GetHoveredLink();
IMGUI_NODE_EDITOR_API NodeId GetDoubleClickedNode();
IMGUI_NODE_EDITOR_API PinId GetDoubleClickedPin();
IMGUI_NODE_EDITOR_API LinkId GetDoubleClickedLink();
IMGUI_NODE_EDITOR_API bool IsBackgroundClicked();
IMGUI_NODE_EDITOR_API bool IsBackgroundDoubleClicked();
IMGUI_NODE_EDITOR_API ImGuiMouseButton GetBackgroundClickButtonIndex(); // -1 if none
IMGUI_NODE_EDITOR_API ImGuiMouseButton GetBackgroundDoubleClickButtonIndex(); // -1 if none
IMGUI_NODE_EDITOR_API bool GetLinkPins(LinkId linkId, PinId* startPinId, PinId* endPinId); // pass nullptr if particular pin do not interest you
IMGUI_NODE_EDITOR_API bool PinHadAnyLinks(PinId pinId);
IMGUI_NODE_EDITOR_API ImVec2 GetScreenSize();
IMGUI_NODE_EDITOR_API ImVec2 ScreenToCanvas(const ImVec2& pos);
IMGUI_NODE_EDITOR_API ImVec2 CanvasToScreen(const ImVec2& pos);
IMGUI_NODE_EDITOR_API int GetNodeCount(); // Returns number of submitted nodes since Begin() call
IMGUI_NODE_EDITOR_API int GetOrderedNodeIds(NodeId* nodes, int size); // Fills an array with node id's in order they're drawn; up to 'size` elements are set. Returns actual size of filled id's.
//------------------------------------------------------------------------------
namespace Details {
template <typename T, typename Tag>
struct SafeType
{
SafeType(T t)
: m_Value(std::move(t))
{
}
SafeType(const SafeType&) = default;
template <typename T2, typename Tag2>
SafeType(
const SafeType
<
typename std::enable_if<!std::is_same<T, T2>::value, T2>::type,
typename std::enable_if<!std::is_same<Tag, Tag2>::value, Tag2>::type
>&) = delete;
SafeType& operator=(const SafeType&) = default;
explicit operator T() const { return Get(); }
T Get() const { return m_Value; }
private:
T m_Value;
};
template <typename Tag>
struct SafePointerType
: SafeType<uintptr_t, Tag>
{
static const Tag Invalid;
using SafeType<uintptr_t, Tag>::SafeType;
SafePointerType()
: SafePointerType(Invalid)
{
}
template <typename T = void> explicit SafePointerType(T* ptr): SafePointerType(reinterpret_cast<uintptr_t>(ptr)) {}
template <typename T = void> T* AsPointer() const { return reinterpret_cast<T*>(this->Get()); }
explicit operator bool() const { return *this != Invalid; }
};
template <typename Tag>
const Tag SafePointerType<Tag>::Invalid = { 0 };
template <typename Tag>
inline bool operator==(const SafePointerType<Tag>& lhs, const SafePointerType<Tag>& rhs)
{
return lhs.Get() == rhs.Get();
}
template <typename Tag>
inline bool operator!=(const SafePointerType<Tag>& lhs, const SafePointerType<Tag>& rhs)
{
return lhs.Get() != rhs.Get();
}
} // namespace Details
struct NodeId final: Details::SafePointerType<NodeId>
{
using SafePointerType::SafePointerType;
};
struct LinkId final: Details::SafePointerType<LinkId>
{
using SafePointerType::SafePointerType;
};
struct PinId final: Details::SafePointerType<PinId>
{
using SafePointerType::SafePointerType;
};
//------------------------------------------------------------------------------
} // namespace Editor
} // namespace ax
//------------------------------------------------------------------------------
# endif // __IMGUI_NODE_EDITOR_H__