view3d_buttons.cc File Reference

#include <cfloat>
#include <cstring>
#include "DNA_armature_types.h"
#include "DNA_curve_types.h"
#include "DNA_lattice_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_meta_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "MEM_guardedalloc.h"
#include "BLT_translation.hh"
#include "BLI_array_utils.h"
#include "BLI_bit_vector.hh"
#include "BLI_listbase.h"
#include "BLI_math_matrix.h"
#include "BLI_math_rotation.h"
#include "BLI_math_vector.h"
#include "BLI_string.h"
#include "BLI_utildefines.h"
#include "BLI_vector.hh"
#include "BKE_action.hh"
#include "BKE_armature.hh"
#include "BKE_context.hh"
#include "BKE_curve.hh"
#include "BKE_curves.hh"
#include "BKE_customdata.hh"
#include "BKE_deform.hh"
#include "BKE_editmesh.hh"
#include "BKE_layer.hh"
#include "BKE_library.hh"
#include "BKE_mesh_types.hh"
#include "BKE_object.hh"
#include "BKE_object_deform.h"
#include "BKE_object_types.hh"
#include "BKE_report.hh"
#include "BKE_screen.hh"
#include "DEG_depsgraph.hh"
#include "WM_api.hh"
#include "WM_types.hh"
#include "RNA_access.hh"
#include "RNA_prototypes.hh"
#include "ED_curves.hh"
#include "ED_grease_pencil.hh"
#include "ED_mesh.hh"
#include "ED_object.hh"
#include "ED_object_vgroup.hh"
#include "ED_screen.hh"
#include "ANIM_bone_collections.hh"
#include "UI_interface.hh"
#include "UI_resources.hh"
#include "view3d_intern.hh"

Go to the source code of this file.

Classes
struct	TransformMedian_Generic
struct	TransformMedian_Mesh
struct	TransformMedian_Curve
struct	TransformMedian_Lattice
struct	TransformMedian_GreasePencil
struct	TransformMedian_Curves
union	TransformMedian
struct	TransformProperties

Macros
#define	TRANSFORM_MEDIAN_ARRAY_LEN   (sizeof(TransformMedian) / sizeof(float))
#define	B_VGRP_PNL_EDIT_SINGLE   8 /* or greater */

Enumerations
enum	{ B_REDR = 2 , B_TRANSFORM_PANEL_MEDIAN = 1008 , B_TRANSFORM_PANEL_DIMS = 1009 }

Functions
static TransformProperties *	v3d_transform_props_ensure (View3D *v3d)
static float	compute_scale_factor (const float ve_median, const float median)
static void	apply_raw_diff (float *val, const int tot, const float ve_median, const float median)
static void	apply_raw_diff_v3 (float val[3], const int tot, const float ve_median[3], const float median[3])
static void	apply_scale_factor (float *val, const int tot, const float ve_median, const float median, const float sca)
static void	apply_scale_factor_clamp (float *val, const int tot, const float ve_median, const float sca)
static void	v3d_editvertex_buts (const bContext *C, uiLayout *layout, View3D *v3d, Object *ob, float lim)
static void	v3d_object_dimension_buts (bContext *C, uiLayout *layout, View3D *v3d, Object *ob)
static void	do_view3d_vgroup_buttons (bContext *C, void *, int event)
static bool	view3d_panel_vgroup_poll (const bContext *C, PanelType *)
static void	update_active_vertex_weight (bContext *C, void *arg1, void *)
static void	view3d_panel_vgroup (const bContext *C, Panel *panel)
static void	v3d_transform_butsR (uiLayout *layout, PointerRNA *ptr)
static void	v3d_posearmature_buts (uiLayout *layout, Object *ob)
static void	v3d_editarmature_buts (uiLayout *layout, Object *ob)
static void	v3d_editmetaball_buts (uiLayout *layout, Object *ob)
static void	do_view3d_region_buttons (bContext *C, void *, int event)
static bool	view3d_panel_transform_poll (const bContext *C, PanelType *)
static void	view3d_panel_transform (const bContext *C, Panel *panel)
static void	hide_collections_menu_draw (const bContext *C, Menu *menu)
void	view3d_buttons_register (ARegionType *art)
static wmOperatorStatus	view3d_object_mode_menu_exec (bContext *C, wmOperator *op)
void	VIEW3D_OT_object_mode_pie_or_toggle (wmOperatorType *ot)
Edit Mesh Partial Updates
static void *	editmesh_partial_update_begin_fn (bContext *, const uiBlockInteraction_Params *params, void *arg1)
static void	editmesh_partial_update_end_fn (bContext *, const uiBlockInteraction_Params *, void *, void *user_data)
static void	editmesh_partial_update_update_fn (bContext *C, const uiBlockInteraction_Params *, void *arg1, void *user_data)

Macro Definition Documentation

B_VGRP_PNL_EDIT_SINGLE

#define B_VGRP_PNL_EDIT_SINGLE   8 /* or greater */

Definition at line 1383 of file view3d_buttons.cc.

Referenced by do_view3d_vgroup_buttons(), and view3d_panel_vgroup().

TRANSFORM_MEDIAN_ARRAY_LEN

#define TRANSFORM_MEDIAN_ARRAY_LEN   (sizeof(TransformMedian) / sizeof(float))

Definition at line 129 of file view3d_buttons.cc.

Referenced by v3d_editvertex_buts().

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
B_REDR
B_TRANSFORM_PANEL_MEDIAN
B_TRANSFORM_PANEL_DIMS

Definition at line 75 of file view3d_buttons.cc.

Function Documentation

apply_raw_diff()

void apply_raw_diff ( float * val, const int tot, const float ve_median, const float median )

static

Apply helpers.

Note

In case we only have one element, copy directly the value instead of applying the diff or scale factor. Avoids some glitches when going e.g. from 3 to 0.0001 (see #37327).

Definition at line 246 of file view3d_buttons.cc.

Referenced by v3d_editvertex_buts().

apply_raw_diff_v3()

void apply_raw_diff_v3 ( float val[3], const int tot, const float ve_median[3], const float median[3] )

static

Definition at line 251 of file view3d_buttons.cc.

References add_v3_v3(), and copy_v3_v3().

Referenced by v3d_editvertex_buts().

apply_scale_factor()

void apply_scale_factor ( float * val, const int tot, const float ve_median, const float median, const float sca )

static

Definition at line 264 of file view3d_buttons.cc.

Referenced by v3d_editvertex_buts().

apply_scale_factor_clamp()

void apply_scale_factor_clamp ( float * val, const int tot, const float ve_median, const float sca )

static

Definition at line 275 of file view3d_buttons.cc.

References CLAMP, and ELEM.

Referenced by v3d_editvertex_buts().

compute_scale_factor()

float compute_scale_factor ( const float ve_median, const float median )

static

Definition at line 214 of file view3d_buttons.cc.

References CLAMP.

Referenced by v3d_editvertex_buts().

do_view3d_region_buttons()

void do_view3d_region_buttons ( bContext * C, void * , int event )

static

Definition at line 1787 of file view3d_buttons.cc.

References B_REDR, B_TRANSFORM_PANEL_DIMS, B_TRANSFORM_PANEL_MEDIAN, BKE_view_layer_active_object_get(), BKE_view_layer_synced_ensure(), C, CTX_data_scene(), CTX_data_view_layer(), CTX_wm_area(), CTX_wm_view3d(), Object::data, DEG_id_tag_update(), ED_area_tag_redraw(), ID_RECALC_GEOMETRY, NC_SPACE, ND_SPACE_VIEW3D, v3d_editvertex_buts(), v3d_object_dimension_buts(), and WM_event_add_notifier().

Referenced by view3d_panel_transform().

do_view3d_vgroup_buttons()

void do_view3d_vgroup_buttons ( bContext * C, void * , int event )

static

Definition at line 1385 of file view3d_buttons.cc.

References B_VGRP_PNL_EDIT_SINGLE, BKE_view_layer_active_object_get(), BKE_view_layer_synced_ensure(), C, CTX_data_scene(), CTX_data_view_layer(), Object::data, DEG_id_tag_update(), ID_RECALC_GEOMETRY, NC_GEOM, ND_DATA, blender::ed::object::vgroup_vert_active_mirror(), and WM_event_add_notifier().

Referenced by view3d_panel_vgroup().

editmesh_partial_update_begin_fn()

void * editmesh_partial_update_begin_fn ( bContext * , const uiBlockInteraction_Params * params, void * arg1 )

static

Definition at line 137 of file view3d_buttons.cc.

References B_TRANSFORM_PANEL_MEDIAN, BLI_array_findindex, BMEditMesh::bm, BM_elem_flag_test, BM_ELEM_SELECT, BM_ITER_MESH_INDEX, BM_mesh_partial_create_from_verts_group_single(), BM_VERTS_OF_MESH, BMPartialUpdate_Params::do_normals, BMPartialUpdate_Params::do_tessellate, i, params, and BMesh::totvert.

Referenced by v3d_editvertex_buts().

editmesh_partial_update_end_fn()

void editmesh_partial_update_end_fn ( bContext * , const uiBlockInteraction_Params * , void * , void * user_data )

static

Definition at line 173 of file view3d_buttons.cc.

References BM_mesh_partial_destroy().

Referenced by v3d_editvertex_buts().

editmesh_partial_update_update_fn()

void editmesh_partial_update_update_fn ( bContext * C, const uiBlockInteraction_Params * , void * arg1, void * user_data )

static

Definition at line 185 of file view3d_buttons.cc.

References BKE_editmesh_looptris_and_normals_calc_with_partial(), C, CTX_wm_view3d(), TransformProperties::tag_for_update, and v3d_transform_props_ensure().

Referenced by v3d_editvertex_buts().

hide_collections_menu_draw()

void hide_collections_menu_draw ( const bContext * C, Menu * menu )

static

Definition at line 1869 of file view3d_buttons.cc.

References C, blender::ed::object::collection_hide_menu_draw(), and Menu::layout.

Referenced by view3d_buttons_register().

update_active_vertex_weight()

void update_active_vertex_weight ( bContext * C, void * arg1, void *  )

static

Definition at line 1417 of file view3d_buttons.cc.

References BKE_defvert_find_index(), BKE_view_layer_active_object_get(), C, CTX_data_view_layer(), CTX_wm_view3d(), ED_mesh_active_dvert_get_only(), POINTER_AS_INT, v3d_transform_props_ensure(), TransformProperties::vertex_weights, and MDeformWeight::weight.

Referenced by view3d_panel_vgroup().

v3d_editarmature_buts()

void v3d_editarmature_buts ( uiLayout * layout, Object * ob )

static

Definition at line 1706 of file view3d_buttons.cc.

References bArmature::act_edbone, ANIM_bonecoll_is_visible_editbone(), BONE_CONNECTED, col, uiLayout::column(), Object::data, EditBone::flag, bArmature::id, IFACE_, uiLayout::label(), EditBone::parent, RNA_pointer_create_discrete(), RNA_pointer_get(), and UI_ITEM_NONE.

Referenced by view3d_panel_transform().

v3d_editmetaball_buts()

void v3d_editmetaball_buts ( uiLayout * layout, Object * ob )

static

Definition at line 1739 of file view3d_buttons.cc.

References col, uiLayout::column(), Object::data, MetaBall::id, IFACE_, uiLayout::label(), MetaBall::lastelem, MB_BALL, MB_CUBE, MB_ELIPSOID, MB_PLANE, MB_TUBE, ptr, RNA_enum_get(), RNA_pointer_create_discrete(), and UI_ITEM_NONE.

Referenced by view3d_panel_transform().

v3d_editvertex_buts()

void v3d_editvertex_buts ( const bContext * C, uiLayout * layout, View3D * v3d, Object * ob, float lim )

static

Definition at line 309 of file view3d_buttons.cc.

References uiLayout::absolute_block(), add_v2_v2(), add_v3_v3(), apply_raw_diff(), apply_raw_diff_v3(), apply_scale_factor(), apply_scale_factor_clamp(), uiBlockInteraction_CallbackData::arg1, B_REDR, B_TRANSFORM_PANEL_MEDIAN, TransformMedian_Curve::b_weight, TransformMedian_Mesh::be_weight, uiBlockInteraction_CallbackData::begin_fn, BKE_curve_editNurbs_get(), BKE_nurb_handles_test(), BKE_nurb_project_2d(), BLI_assert, bm, BMEditMesh::bm, BM_data_layer_add_named(), BM_EDGES_OF_MESH, BM_ELEM_CD_GET_FLOAT, BM_ELEM_CD_GET_VOID_P, BM_elem_flag_test, BM_ELEM_SELECT, BM_ITER_MESH, BM_VERTS_OF_MESH, TransformMedian_Mesh::bv_weight, C, CD_MVERT_SKIN, CD_PROP_FLOAT, BMVert::co, compute_scale_factor(), copy_vn_fl(), CTX_data_scene(), CU_BEZIER, CU_IS_2D, TransformMedian::curve, TransformMedian::curves, CustomData_get_offset(), CustomData_get_offset_named(), CustomData_has_layer_named(), Object::data, Lattice::def, DEG2RADF, blender::ed::greasepencil::MutableDrawingInfo::drawing, TransformMedian_Mesh::e_crease, Lattice::editlatt, editmesh_partial_update_begin_fn(), editmesh_partial_update_end_fn(), editmesh_partial_update_update_fn(), ELEM, uiBlockInteraction_CallbackData::end_fn, BezTriple::f1, BPoint::f1, BezTriple::f2, BezTriple::f3, View3D::flag, IndexMask::foreach_index(), TransformMedian::generic, Curves::geometry, i, Curve::id, Lattice::id, IFACE_, Span< T >::index_range(), invert_m4_m4(), IndexMask::is_empty(), EditLatt::latt, TransformMedian::lattice, len_squared_v3(), LISTBASE_FOREACH, TransformMedian_Curve::location, TransformMedian_Curves::location, TransformMedian_Generic::location, TransformMedian_GreasePencil::location, TransformMedian_Lattice::location, TransformMedian_Mesh::location, TransformMedian::mesh, mul_m4_v3(), mul_v3_fl(), NURB_HANDLE_TEST_EACH, OB_CURVES, OB_CURVES_LEGACY, OB_GREASE_PENCIL, OB_LATTICE, OB_MESH, OB_SURF, blender::threading::parallel_for_each(), Lattice::pntsu, Lattice::pntsv, Lattice::pntsw, PROP_UNIT_LENGTH, PROP_UNIT_ROTATION, BezTriple::radius, BPoint::radius, MVertSkin::radius, TransformMedian_Curve::radius, blender::ed::greasepencil::retrieve_editable_drawings(), RNA_pointer_create_discrete(), RNA_TRANSLATION_PREC_DEFAULT, Mesh::runtime, Object::runtime, SELECT, IndexMask::size(), TransformMedian_Mesh::skin, blender::bke::greasepencil::Drawing::strokes(), blender::bke::greasepencil::Drawing::strokes_for_write(), sub_vn_vnvn(), TransformProperties::tag_for_update, blender::bke::greasepencil::Drawing::tag_positions_changed(), BezTriple::tilt, BPoint::tilt, TransformMedian_Curve::tilt, tilt_limit, TIP_, TRANSFORM_MEDIAN_ARRAY_LEN, Object::type, UI_block_align_begin(), UI_block_align_end(), UI_block_interaction_set(), UI_BTYPE_LABEL, UI_BTYPE_NUM, UI_BTYPE_TOGGLE, UI_BTYPE_TOGGLE_N, UI_but_number_precision_set(), UI_but_number_step_size_set(), UI_but_unit_type_set(), UI_SCALE_FAC, uiDefBut(), uiDefButBitS(), uiDefButF(), uiDefButR(), uiBlockInteraction_CallbackData::update_fn, V3D_GLOBAL_STATS, v3d_transform_props_ensure(), TransformMedian_Mesh::v_crease, TransformProperties::ve_median, BezTriple::vec, BPoint::vec, BezTriple::weight, BPoint::weight, TransformMedian_Curve::weight, and TransformMedian_Lattice::weight.

Referenced by do_view3d_region_buttons(), and view3d_panel_transform().

v3d_object_dimension_buts()

void v3d_object_dimension_buts ( bContext * C, uiLayout * layout, View3D * v3d, Object * ob )

static

Definition at line 1312 of file view3d_buttons.cc.

References uiLayout::absolute_block(), B_TRANSFORM_PANEL_DIMS, BKE_object_dimensions_eval_cached_get(), BKE_object_dimensions_set_ex(), BLI_assert, C, copy_m4_m4(), copy_v3_v3(), FLT_MAX, i, Object::id, ID_IS_EDITABLE, IFACE_, TransformProperties::ob_dims, TransformProperties::ob_dims_orig, TransformProperties::ob_obmat_orig, TransformProperties::ob_scale_orig, PROP_UNIT_LENGTH, RNA_id_pointer_create(), RNA_property_update(), RNA_struct_find_property(), Object::scale, UI_block_align_begin(), UI_block_align_end(), UI_BTYPE_LABEL, UI_BTYPE_NUM, UI_but_disable(), UI_but_number_precision_set(), UI_but_number_step_size_set(), UI_but_unit_type_set(), UI_SCALE_FAC, uiDefBut(), uiDefButF(), and v3d_transform_props_ensure().

Referenced by do_view3d_region_buttons(), and view3d_panel_transform().

v3d_posearmature_buts()

void v3d_posearmature_buts ( uiLayout * layout, Object * ob )

static

Definition at line 1684 of file view3d_buttons.cc.

References BKE_pose_channel_active_if_bonecoll_visible(), col, uiLayout::column(), Object::id, IFACE_, uiLayout::label(), RNA_pointer_create_discrete(), and v3d_transform_butsR().

Referenced by view3d_panel_transform().

v3d_transform_butsR()

void v3d_transform_butsR ( uiLayout * layout, PointerRNA * ptr )

static

Definition at line 1590 of file view3d_buttons.cc.

References BONE_CONNECTED, PointerRNA::data, Bone::flag, IFACE_, uiLayout::label(), blender::ui::NoneOrStatus, Bone::parent, uiLayout::prop(), ptr, RNA_boolean_get(), RNA_enum_get(), RNA_pointer_get(), ROT_MODE_AXISANGLE, ROT_MODE_QUAT, split(), uiLayout::split(), UI_ITEM_NONE, UI_ITEM_R_ICON_ONLY, UI_ITEM_R_TOGGLE, uiLayoutSetActive(), and uiLayoutSetEmboss().

Referenced by v3d_posearmature_buts(), and view3d_panel_transform().

v3d_transform_props_ensure()

TransformProperties * v3d_transform_props_ensure ( View3D * v3d )

static

Definition at line 293 of file view3d_buttons.cc.

References View3D_Runtime::properties_storage, View3D_Runtime::properties_storage_free, and View3D::runtime.

Referenced by editmesh_partial_update_update_fn(), update_active_vertex_weight(), v3d_editvertex_buts(), v3d_object_dimension_buts(), and view3d_panel_vgroup().

view3d_buttons_register()

void view3d_buttons_register

(

ARegionType *

art

)

Definition at line 1874 of file view3d_buttons.cc.

References BLI_addtail(), BLT_I18NCONTEXT_DEFAULT_BPYRNA, PanelType::category, MenuType::draw, PanelType::draw, hide_collections_menu_draw(), MenuType::idname, PanelType::idname, MenuType::label, PanelType::label, MEM_callocN(), N_, ARegionType::paneltypes, PanelType::poll, STRNCPY(), MenuType::translation_context, PanelType::translation_context, view3d_panel_transform(), view3d_panel_transform_poll(), view3d_panel_vgroup(), view3d_panel_vgroup_poll(), and WM_menutype_add().

Referenced by ED_spacetype_view3d().

view3d_object_mode_menu_exec()

wmOperatorStatus view3d_object_mode_menu_exec ( bContext * C, wmOperator * op )

static

Definition at line 1906 of file view3d_buttons.cc.

References BKE_report(), C, CTX_data_active_object(), CTX_wm_window(), ELEM, Object::mode, blender::ed::object::mode_set(), OB_ARMATURE, OB_MODE_EDIT, OB_MODE_OBJECT, OB_MODE_POSE, OPERATOR_CANCELLED, wmOperator::reports, RPT_WARNING, Object::type, and UI_pie_menu_invoke().

Referenced by VIEW3D_OT_object_mode_pie_or_toggle().

VIEW3D_OT_object_mode_pie_or_toggle()

void VIEW3D_OT_object_mode_pie_or_toggle

(

wmOperatorType *

ot

)

Definition at line 1922 of file view3d_buttons.cc.

References ED_operator_view3d_active(), ot, and view3d_object_mode_menu_exec().

Referenced by view3d_operatortypes().

view3d_panel_transform()

void view3d_panel_transform ( const bContext * C, Panel * panel )

static

Definition at line 1826 of file view3d_buttons.cc.

References BKE_view_layer_active_object_get(), BKE_view_layer_synced_ensure(), C, col, uiLayout::column(), CTX_data_scene(), CTX_data_view_layer(), CTX_wm_view3d(), do_view3d_region_buttons(), ELEM, FLT_MAX, Object::id, Panel::layout, Object::mode, OB_ARMATURE, OB_CURVES, OB_MBALL, OB_MODE_POSE, OB_POINTCLOUD, OB_TYPE_SUPPORT_EDITMODE, OB_VOLUME, OBEDIT_FROM_OBACT, RNA_id_pointer_create(), Object::type, UI_block_func_handle_set(), uiLayoutGetBlock(), v3d_editarmature_buts(), v3d_editmetaball_buts(), v3d_editvertex_buts(), v3d_object_dimension_buts(), v3d_posearmature_buts(), and v3d_transform_butsR().

Referenced by view3d_buttons_register().

view3d_panel_transform_poll()

bool view3d_panel_transform_poll ( const bContext * C, PanelType *  )

static

Definition at line 1818 of file view3d_buttons.cc.

References BKE_view_layer_active_base_get(), BKE_view_layer_synced_ensure(), C, CTX_data_scene(), and CTX_data_view_layer().

Referenced by view3d_buttons_register().

view3d_panel_vgroup()

void view3d_panel_vgroup ( const bContext * C, Panel * panel )

static

Definition at line 1429 of file view3d_buttons.cc.

References uiLayout::absolute_block(), B_VGRP_PNL_EDIT_SINGLE, BKE_defvert_find_index(), BKE_object_defgroup_active_index_get(), BKE_object_defgroup_list(), BKE_object_defgroup_subset_from_select_type(), BKE_view_layer_active_object_get(), BKE_view_layer_synced_ensure(), BLI_listbase_count(), C, col, uiLayout::column(), CTX_data_scene(), CTX_data_view_layer(), CTX_wm_view3d(), DG_LOCK_WEIGHT, do_view3d_vgroup_buttons(), ED_mesh_active_dvert_get_only(), ListBase::first, bDeformGroup::flag, i, IFACE_, Panel::layout, MEM_freeN(), bDeformGroup::name, bDeformGroup::next, uiLayout::op(), ot, POINTER_FROM_INT, uiLayout::prop(), Vector< T, InlineBufferCapacity, Allocator >::resize(), RNA_int_set(), RNA_pointer_create_discrete(), uiLayout::row(), split(), TIP_, Scene::toolsettings, MDeformVert::totweight, UI_block_func_handle_set(), UI_BTYPE_BUT, UI_BTYPE_NUM, UI_BUT_DISABLED, UI_but_drawflag_enable(), UI_but_flag_enable(), UI_but_func_set(), UI_BUT_INACTIVE, UI_but_number_precision_set(), UI_but_number_step_size_set(), UI_but_operator_ptr_ensure(), UI_BUT_TEXT_LEFT, UI_BUT_TEXT_RIGHT, UI_ITEM_NONE, UI_ITEM_R_EXPAND, UI_UNIT_X, UI_UNIT_Y, uiDefButF(), uiDefButO_ptr(), uiLayoutSetEnabled(), update_active_vertex_weight(), v3d_transform_props_ensure(), TransformProperties::vertex_weights, ToolSettings::vgroupsubset, MDeformWeight::weight, WM_OP_EXEC_DEFAULT, WM_OP_INVOKE_DEFAULT, WM_operatortype_find(), and x.

Referenced by view3d_buttons_register().

view3d_panel_vgroup_poll()

bool view3d_panel_vgroup_poll ( const bContext * C, PanelType *  )

static

Definition at line 1401 of file view3d_buttons.cc.

References BKE_object_is_in_editmode_vgroup(), BKE_object_is_in_wpaint_select_vert(), BKE_view_layer_active_object_get(), BKE_view_layer_synced_ensure(), C, CTX_data_scene(), CTX_data_view_layer(), ED_mesh_active_dvert_get_only(), and MDeformVert::totweight.

Referenced by view3d_buttons_register().