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imgui_node_editor.h
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//------------------------------------------------------------------------------
// 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
//------------------------------------------------------------------------------
# include <imgui.h>
# include <cstdint> // std::uintXX_t
# include <utility> // std::move
//------------------------------------------------------------------------------
namespace ax {
namespace NodeEditor {
//------------------------------------------------------------------------------
struct NodeId;
struct LinkId;
struct PinId;
//------------------------------------------------------------------------------
enum class SaveReasonFlags: uint32_t
{
None = 0x00000000,
Navigation = 0x00000001,
Position = 0x00000002,
Size = 0x00000004,
Selection = 0x00000008,
User = 0x00000010
};
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
{
const char* SettingsFile;
ConfigSession BeginSaveSession;
ConfigSession EndSaveSession;
ConfigSaveSettings SaveSettings;
ConfigLoadSettings LoadSettings;
ConfigSaveNodeSettings SaveNodeSettings;
ConfigLoadNodeSettings LoadNodeSettings;
void* UserPointer;
Config()
: SettingsFile("NodeEditor.json")
, BeginSaveSession(nullptr)
, EndSaveSession(nullptr)
, SaveSettings(nullptr)
, LoadSettings(nullptr)
, SaveNodeSettings(nullptr)
, LoadNodeSettings(nullptr)
, UserPointer(nullptr)
{
}
};
//------------------------------------------------------------------------------
enum class PinKind
{
Input,
Output
};
//------------------------------------------------------------------------------
enum StyleColor
{
StyleColor_Bg,
StyleColor_Grid,
StyleColor_NodeBg,
StyleColor_NodeBorder,
StyleColor_HovNodeBorder,
StyleColor_SelNodeBorder,
StyleColor_NodeSelRect,
StyleColor_NodeSelRectBorder,
StyleColor_HovLinkBorder,
StyleColor_SelLinkBorder,
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,
};
struct Style
{
ImVec4 NodePadding;
float NodeRounding;
float NodeBorderWidth;
float HoveredNodeBorderWidth;
float SelectedNodeBorderWidth;
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;
ImVec4 Colors[StyleColor_Count];
Style()
{
NodePadding = ImVec4(8, 8, 8, 8);
NodeRounding = 12.0f;
NodeBorderWidth = 1.5f;
HoveredNodeBorderWidth = 3.5f;
SelectedNodeBorderWidth = 3.5f;
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(-1, -1);
PivotScale = ImVec2(1, 1);
PinCorners = ImDrawCornerFlags_All;
PinRadius = 0.0f;
PinArrowSize = 0.0f;
PinArrowWidth = 0.0f;
GroupRounding = 6.0f;
GroupBorderWidth = 1.0f;
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_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;
//------------------------------------------------------------------------------
void SetCurrentEditor(EditorContext* ctx);
EditorContext* GetCurrentEditor();
EditorContext* CreateEditor(const Config* config = nullptr);
void DestroyEditor(EditorContext* ctx);
Style& GetStyle();
const char* GetStyleColorName(StyleColor colorIndex);
void PushStyleColor(StyleColor colorIndex, const ImVec4& color);
void PopStyleColor(int count = 1);
void PushStyleVar(StyleVar varIndex, float value);
void PushStyleVar(StyleVar varIndex, const ImVec2& value);
void PushStyleVar(StyleVar varIndex, const ImVec4& value);
void PopStyleVar(int count = 1);
void Begin(const char* id, const ImVec2& size = ImVec2(0, 0));
void End();
void BeginNode(NodeId id);
void BeginPin(PinId id, PinKind kind);
void PinRect(const ImVec2& a, const ImVec2& b);
void PinPivotRect(const ImVec2& a, const ImVec2& b);
void PinPivotSize(const ImVec2& size);
void PinPivotScale(const ImVec2& scale);
void PinPivotAlignment(const ImVec2& alignment);
void EndPin();
void Group(const ImVec2& size);
void EndNode();
bool BeginGroupHint(NodeId nodeId);
ImVec2 GetGroupMin();
ImVec2 GetGroupMax();
ImDrawList* GetHintForegroundDrawList();
ImDrawList* GetHintBackgroundDrawList();
void EndGroupHint();
// TODO: Add a way to manage node background channels
ImDrawList* GetNodeBackgroundDrawList(NodeId nodeId);
bool Link(LinkId id, PinId startPinId, PinId endPinId, const ImVec4& color = ImVec4(1, 1, 1, 1), float thickness = 1.0f);
void Flow(LinkId linkId);
bool BeginCreate(const ImVec4& color = ImVec4(1, 1, 1, 1), float thickness = 1.0f);
bool QueryNewLink(PinId* startId, PinId* endId);
bool QueryNewLink(PinId* startId, PinId* endId, const ImVec4& color, float thickness = 1.0f);
bool QueryNewNode(PinId* pinId);
bool QueryNewNode(PinId* pinId, const ImVec4& color, float thickness = 1.0f);
bool AcceptNewItem();
bool AcceptNewItem(const ImVec4& color, float thickness = 1.0f);
void RejectNewItem();
void RejectNewItem(const ImVec4& color, float thickness = 1.0f);
void EndCreate();
bool BeginDelete();
bool QueryDeletedLink(LinkId* linkId, PinId* startId = nullptr, PinId* endId = nullptr);
bool QueryDeletedNode(NodeId* nodeId);
bool AcceptDeletedItem();
void RejectDeletedItem();
void EndDelete();
void SetNodePosition(NodeId nodeId, const ImVec2& editorPosition);
ImVec2 GetNodePosition(NodeId nodeId);
ImVec2 GetNodeSize(NodeId nodeId);
void CenterNodeOnScreen(NodeId nodeId);
void RestoreNodeState(NodeId nodeId);
void Suspend();
void Resume();
bool IsSuspended();
bool IsActive();
bool HasSelectionChanged();
int GetSelectedObjectCount();
int GetSelectedNodes(NodeId* nodes, int size);
int GetSelectedLinks(LinkId* links, int size);
void ClearSelection();
void SelectNode(NodeId nodeId, bool append = false);
void SelectLink(LinkId linkId, bool append = false);
void DeselectNode(NodeId nodeId);
void DeselectLink(LinkId linkId);
bool DeleteNode(NodeId nodeId);
bool DeleteLink(LinkId linkId);
void NavigateToContent(float duration = -1);
void NavigateToSelection(bool zoomIn = false, float duration = -1);
bool ShowNodeContextMenu(NodeId* nodeId);
bool ShowPinContextMenu(PinId* pinId);
bool ShowLinkContextMenu(LinkId* linkId);
bool ShowBackgroundContextMenu();
void EnableShortcuts(bool enable);
bool AreShortcutsEnabled();
bool BeginShortcut();
bool AcceptCut();
bool AcceptCopy();
bool AcceptPaste();
bool AcceptDuplicate();
bool AcceptCreateNode();
int GetActionContextSize();
int GetActionContextNodes(NodeId* nodes, int size);
int GetActionContextLinks(LinkId* links, int size);
void EndShortcut();
float GetCurrentZoom();
NodeId GetDoubleClickedNode();
PinId GetDoubleClickedPin();
LinkId GetDoubleClickedLink();
bool IsBackgroundClicked();
bool IsBackgroundDoubleClicked();
bool PinHadAnyLinks(PinId pinId);
ImVec2 GetScreenSize();
ImVec2 ScreenToCanvas(const ImVec2& pos);
ImVec2 CanvasToScreen(const ImVec2& pos);
//------------------------------------------------------------------------------
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__