XCEngine/editor/src/Viewport/SceneViewportInteractionActions.cpp

#include "SceneViewportInteractionActions.h"

#include "IViewportHostService.h"

namespace XCEngine {
namespace Editor {

SceneViewportActiveGizmoKind ToSceneViewportActiveGizmoKind(SceneViewportInteractionKind kind) {
    switch (kind) {
    case SceneViewportInteractionKind::MoveGizmo:
        return SceneViewportActiveGizmoKind::Move;
    case SceneViewportInteractionKind::RotateGizmo:
        return SceneViewportActiveGizmoKind::Rotate;
    case SceneViewportInteractionKind::ScaleGizmo:
        return SceneViewportActiveGizmoKind::Scale;
    case SceneViewportInteractionKind::OrientationGizmo:
    case SceneViewportInteractionKind::SceneIcon:
    case SceneViewportInteractionKind::None:
    default:
        return SceneViewportActiveGizmoKind::None;
    }
}

SceneViewportHoveredHandleState BuildSceneViewportHoveredHandleState(
    const SceneViewportInteractionResult& interaction) {
    SceneViewportHoveredHandleState state = {};
    state.hoveredGizmoKind = ToSceneViewportActiveGizmoKind(interaction.kind);
    if (interaction.kind == SceneViewportInteractionKind::MoveGizmo) {
        state.moveAxis = interaction.moveAxis;
        state.movePlane = interaction.movePlane;
    } else if (interaction.kind == SceneViewportInteractionKind::RotateGizmo) {
        state.rotateAxis = interaction.rotateAxis;
    } else if (interaction.kind == SceneViewportInteractionKind::ScaleGizmo) {
        state.scaleHandle = interaction.scaleHandle;
    }

    return state;
}

void ApplySceneViewportHoveredHandleState(
    const SceneViewportHoveredHandleState& hoveredHandleState,
    bool gizmoActive,
    bool showingMoveGizmo,
    SceneViewportMoveGizmo& moveGizmo,
    bool showingRotateGizmo,
    SceneViewportRotateGizmo& rotateGizmo,
    bool showingScaleGizmo,
    SceneViewportScaleGizmo& scaleGizmo) {
    if (gizmoActive) {
        return;
    }

    if (showingMoveGizmo) {
        moveGizmo.SetHoveredHandle(hoveredHandleState.moveAxis, hoveredHandleState.movePlane);
    }
    if (showingRotateGizmo) {
        rotateGizmo.SetHoveredHandle(hoveredHandleState.rotateAxis);
    }
    if (showingScaleGizmo) {
        scaleGizmo.SetHoveredHandle(hoveredHandleState.scaleHandle);
    }
}

SceneViewportInteractionActions BuildSceneViewportInteractionActions(
    const SceneViewportInteractionResult& interaction,
    bool hasInteractiveViewport,
    bool clickedLeft,
    bool canResolveViewportInteraction) {
    SceneViewportInteractionActions actions = {};
    actions.hoveredGizmoKind = ToSceneViewportActiveGizmoKind(interaction.kind);
    actions.orientationAxis = interaction.kind == SceneViewportInteractionKind::OrientationGizmo
        ? interaction.orientationAxis
        : SceneViewportOrientationAxis::None;
    actions.sceneIconEntityId = interaction.kind == SceneViewportInteractionKind::SceneIcon
        ? interaction.entityId
        : 0;
    actions.beginTransformGizmo =
        hasInteractiveViewport &&
        clickedLeft &&
        actions.hoveredGizmoKind != SceneViewportActiveGizmoKind::None;
    actions.orientationGizmoClick =
        hasInteractiveViewport &&
        clickedLeft &&
        actions.orientationAxis != SceneViewportOrientationAxis::None;
    actions.sceneIconClick =
        hasInteractiveViewport &&
        clickedLeft &&
        actions.sceneIconEntityId != 0;
    actions.selectSceneClick =
        hasInteractiveViewport &&
        clickedLeft &&
        canResolveViewportInteraction &&
        !interaction.HasHit();
    return actions;
}

void DispatchSceneViewportInteractionActions(
    const SceneViewportInteractionActions& actions,
    IEditorContext& context,
    IViewportHostService& viewportHostService,
    const ::XCEngine::UI::UISize& viewportSize,
    const Math::Vector2& localMousePosition) {
    if (actions.orientationGizmoClick) {
        viewportHostService.AlignSceneViewToOrientationAxis(actions.orientationAxis);
    }

    if (actions.sceneIconClick) {
        context.GetSelectionManager().SetSelectedEntity(actions.sceneIconEntityId);
        return;
    }

    if (!actions.selectSceneClick) {
        return;
    }

    const uint64_t selectedEntity = viewportHostService.PickSceneViewEntity(
        context,
        viewportSize,
        ::XCEngine::UI::UIPoint(localMousePosition.x, localMousePosition.y));
    if (selectedEntity != 0) {
        context.GetSelectionManager().SetSelectedEntity(selectedEntity);
    } else {
        context.GetSelectionManager().ClearSelection();
    }
}

} // namespace Editor
} // namespace XCEngine