ADD: Selection

third_party/ImGuizmo/GraphEditor.h

@@ -0,0 +1,151 @@
+// https://github.com/CedricGuillemet/ImGuizmo
+// v1.92.5 WIP
+//
+// The MIT License(MIT)
+//
+// Copyright(c) 2016-2021 Cedric Guillemet
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files(the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions :
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+#pragma once
+
+#include <vector>
+#include <stdint.h>
+#include <string>
+#include "imgui.h"
+#include "imgui_internal.h"
+
+namespace GraphEditor {
+
+typedef size_t NodeIndex;
+typedef size_t SlotIndex;
+typedef size_t LinkIndex;
+typedef size_t TemplateIndex;
+
+// Force the view to be respositionned and zoom to fit nodes with Show function.
+// Parameter value will be changed to Fit_None by the function.
+enum FitOnScreen
+{
+    Fit_None,
+    Fit_AllNodes,
+    Fit_SelectedNodes
+};
+
+// Display options and colors
+struct Options
+{
+    ImRect mMinimap{{0.75f, 0.8f, 0.99f, 0.99f}}; // rectangle coordinates of minimap
+    ImU32 mBackgroundColor{ IM_COL32(40, 40, 40, 255) }; // full background color
+    ImU32 mGridColor{ IM_COL32(0, 0, 0, 60) }; // grid lines color
+    ImU32 mGridColor2{ IM_COL32(0, 0, 0, 160) }; // grid lines color every 10th
+    ImU32 mSelectedNodeBorderColor{ IM_COL32(255, 130, 30, 255) }; // node border color when it's selected
+    ImU32 mNodeBorderColor{ IM_COL32(100, 100, 100, 0) }; // node border color when it's not selected
+    ImU32 mQuadSelection{ IM_COL32(255, 32, 32, 64) }; // quad selection inside color
+    ImU32 mQuadSelectionBorder{ IM_COL32(255, 32, 32, 255) }; // quad selection border color
+    ImU32 mDefaultSlotColor{ IM_COL32(128, 128, 128, 255) }; // when no color is provided in node template, use this value
+    ImU32 mFrameFocus{ IM_COL32(64, 128, 255, 255) }; // rectangle border when graph editor has focus
+    float mLineThickness{ 5 }; // links width in pixels when zoom value is 1
+    float mGridSize{ 64.f }; // background grid size in pixels when zoom value is 1
+    float mRounding{ 3.f }; // rounding at node corners
+    float mZoomRatio{ 0.1f }; // factor per mouse wheel delta
+    float mZoomLerpFactor{ 0.25f }; // the smaller, the smoother
+    float mBorderSelectionThickness{ 6.f }; // thickness of selection border around nodes
+    float mBorderThickness{ 6.f }; // thickness of selection border around nodes
+    float mNodeSlotRadius{ 8.f }; // circle radius for inputs and outputs
+    float mNodeSlotHoverFactor{ 1.2f }; // increase size when hovering
+    float mMinZoom{ 0.2f }, mMaxZoom { 1.1f };
+    float mSnap{ 5.f };
+    bool mDisplayLinksAsCurves{ true }; // false is straight and 45deg lines
+    bool mAllowQuadSelection{ true }; // multiple selection using drag and drop
+    bool mRenderGrid{ true }; // grid or nothing
+    bool mDrawIONameOnHover{ true }; // only draw node input/output when hovering
+};
+
+// View state: scroll position and zoom factor
+struct ViewState
+{
+    ImVec2 mPosition{0.0f, 0.0f}; // scroll position
+    float mFactor{ 1.0f }; // current zoom factor
+    float mFactorTarget{ 1.0f }; // targeted zoom factor interpolated using Options.mZoomLerpFactor
+};
+
+struct Template
+{
+    ImU32 mHeaderColor;
+    ImU32 mBackgroundColor;
+    ImU32 mBackgroundColorOver;
+    ImU8 mInputCount;
+    const char** mInputNames; // can be nullptr. No text displayed.
+    ImU32* mInputColors; // can be nullptr, default slot color will be used.
+    ImU8 mOutputCount;
+    const char** mOutputNames; // can be nullptr. No text displayed.
+    ImU32* mOutputColors; // can be nullptr, default slot color will be used.
+};
+
+struct Node
+{
+    const char* mName;
+    TemplateIndex mTemplateIndex;
+    ImRect mRect;
+    bool mSelected{ false };
+};
+
+struct Link
+{
+    NodeIndex mInputNodeIndex;
+    SlotIndex mInputSlotIndex;
+    NodeIndex mOutputNodeIndex;
+    SlotIndex mOutputSlotIndex;
+};
+
+struct Delegate
+{
+    virtual bool AllowedLink(NodeIndex from, NodeIndex to) = 0;
+
+    virtual void SelectNode(NodeIndex nodeIndex, bool selected) = 0;
+    virtual void MoveSelectedNodes(const ImVec2 delta) = 0;
+    
+    virtual void AddLink(NodeIndex inputNodeIndex, SlotIndex inputSlotIndex, NodeIndex outputNodeIndex, SlotIndex outputSlotIndex) = 0;
+    virtual void DelLink(LinkIndex linkIndex) = 0;
+    
+    // user is responsible for clipping
+    virtual void CustomDraw(ImDrawList* drawList, ImRect rectangle, NodeIndex nodeIndex) = 0;
+    
+    // use mouse position to open context menu
+    // if nodeIndex != -1, right click happens on the specified node
+    virtual void RightClick(NodeIndex nodeIndex, SlotIndex slotIndexInput, SlotIndex slotIndexOutput) = 0;
+
+    virtual const size_t GetTemplateCount() = 0;
+    virtual const Template GetTemplate(TemplateIndex index) = 0;
+
+    virtual const size_t GetNodeCount() = 0;
+    virtual const Node GetNode(NodeIndex index) = 0;
+    
+    virtual const size_t GetLinkCount() = 0;
+    virtual const Link GetLink(LinkIndex index) = 0;
+
+    virtual ~Delegate() = default;
+};
+
+void Show(Delegate& delegate, const Options& options, ViewState& viewState, bool enabled, FitOnScreen* fit = nullptr);
+void GraphEditorClear();
+
+bool EditOptions(Options& options);
+
+} // namespace