Init Repo

src/ui/ViewportPanel.h

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+#pragma once
+
+#include "ViewportTile.h"
+#include "TransformManipulator.h"
+#include "IconManager.h"
+#include "../core/CommandHistory.h"
+
+#include <pxr/usd/usd/stage.h>
+#include <pxr/usd/sdf/path.h>
+#include <imgui.h>
+
+#include <functional>
+#include <memory>
+#include <vector>
+#include <string>
+
+namespace UsdLayerManager {
+
+/// How many tiles the viewport area is divided into.
+enum class LayoutMode {
+    Single,  ///< 1 tile — full area
+    HSplit,  ///< 2 tiles side by side (left | right)
+    VSplit,  ///< 2 tiles top / bottom
+    Quad,    ///< 4 tiles in a 2×2 grid
+};
+
+/// Multi-viewport container.
+///
+/// Owns N ViewportTile instances, a shared TransformManipulator, and the
+/// authoritative selection state.  Manages layout splitting, draggable
+/// dividers, and the Maya-style Space-key maximize / restore.
+class ViewportPanel {
+public:
+    ViewportPanel();
+    ~ViewportPanel();
+
+    // ── Setup ────────────────────────────────────────────────────────────────
+    void SetStage(pxr::UsdStageRefPtr stage);
+    void FrameScene();
+    void SetCommandHistory(CommandHistory* history);
+    void SetIconManager(IconManager* icons);
+
+    // ── Selection (called by SceneHierarchyPanel) ────────────────────────────
+    /// Set a single selected prim (clears any multi-selection).
+    void SetSelectedPrimPath(const std::string& path);
+
+    // ── Main render (called from Application::RenderUI) ──────────────────────
+    void Render();
+
+    // ── Pick callbacks (wired by Application after construction) ─────────────
+    std::function<void(const std::string&)>              OnPrimPicked;
+    std::function<void(const std::vector<std::string>&)> OnPrimsPickedRect;
+
+    // ── Forwarding accessors (delegate to focused tile) ──────────────────────
+    ViewportCamera&   GetCamera();
+    UsdSceneRenderer& GetRenderer();
+
+    // ── Layout ───────────────────────────────────────────────────────────────
+    void       SetLayout(LayoutMode mode);
+    LayoutMode GetLayout()           const { return m_layout;           }
+    int        GetFocusedTileIndex() const { return m_focusedTileIndex; }
+
+private:
+    // ── Tile rect helper ─────────────────────────────────────────────────────
+    struct TileRect { ImVec2 pos; ImVec2 size; };
+    std::vector<TileRect> ComputeTileRects(ImVec2 origin, ImVec2 total) const;
+
+    // ── Render sub-functions ─────────────────────────────────────────────────
+    /// Draws the global vertical left toolbar (layout buttons + tool mode buttons).
+    /// Occupies a reserved strip of width kToolbarW on the left of the content area.
+    void RenderGlobalLeftToolbar(ImVec2 contentPos, ImVec2 contentSize);
+    void DrawDividers(ImVec2 origin, ImVec2 total);
+    void HandleMaximizeInput(int hoveredTileIndex);
+    /// Returns true when the mouse is currently over a divider hit-zone or a
+    /// divider drag is already in progress.  Used to suppress tile rect-selection
+    /// when the user is resizing tiles.
+    bool IsMouseOverDivider(ImVec2 origin, ImVec2 total) const;
+
+    /// Width (px) of the reserved left toolbar strip.
+    static constexpr float kToolbarW = 52.0f;
+
+    // ── Selection management ─────────────────────────────────────────────────
+    /// Push the current shared selection into every tile and the manipulator.
+    void BroadcastSelection();
+    /// Update the focused tile index and update the gizmo's selected prim.
+    void UpdateFocusTile(int idx);
+
+    // ── Tile setup ───────────────────────────────────────────────────────────
+    /// (Re)create tiles so that exactly `count` tiles exist, reusing existing
+    /// ones where possible to preserve camera/settings state.
+    void EnsureTileCount(int count);
+    /// Wire pick callbacks for tile at index `i`.
+    void WireCallbacks(int i);
+
+    // ── Tiles ────────────────────────────────────────────────────────────────
+    std::vector<std::unique_ptr<ViewportTile>> m_tiles;
+
+    // ── Shared manipulator ───────────────────────────────────────────────────
+    TransformManipulator m_manipulator;
+
+    // ── Shared selection (authoritative) ────────────────────────────────────
+    pxr::SdfPathVector m_selectedSdfPaths;
+    std::string        m_selectedPrimPath;
+
+    // ── Layout state ─────────────────────────────────────────────────────────
+    LayoutMode m_layout  = LayoutMode::Single;
+    float      m_splitH  = 0.5f; ///< Horizontal divider (0–1); used by HSplit + Quad
+    float      m_splitV  = 0.5f; ///< Vertical   divider (0–1); used by VSplit + Quad
+
+    // Divider drag state
+    bool  m_draggingDivH = false; ///< Dragging the vertical   line (changes m_splitH)
+    bool  m_draggingDivV = false; ///< Dragging the horizontal line (changes m_splitV)
+
+    // ── Maximize state ───────────────────────────────────────────────────────
+    int        m_maximizedTileIndex   = -1;             ///< -1 = not maximised
+    LayoutMode m_layoutBeforeMaximize = LayoutMode::Single;
+    float      m_splitHBefore         = 0.5f;
+    float      m_splitVBefore         = 0.5f;
+
+    // ── Focus ────────────────────────────────────────────────────────────────
+    int m_focusedTileIndex = 0;
+
+    // ── Shared dependencies forwarded to tiles ───────────────────────────────
+    pxr::UsdStageRefPtr m_stage;
+    IconManager*        m_iconManager    = nullptr;
+    CommandHistory*     m_commandHistory = nullptr;
+};
+
+} // namespace UsdLayerManager