自学教程：C++ ED_region_tag_redraw函数代码示例

/** * /brief get the ID from the screen. * */static void datadropper_id_sample_pt(bContext *C, DataDropper *ddr, int mx, int my, ID **r_id){	/* we could use some clever */	wmWindow *win = CTX_wm_window(C);	ScrArea *sa;	ScrArea *area_prev = CTX_wm_area(C);	ARegion *ar_prev = CTX_wm_region(C);	ddr->name[0] = '/0';	for (sa = win->screen->areabase.first; sa; sa = sa->next) {		if (BLI_rcti_isect_pt(&sa->totrct, mx, my)) {			if (sa->spacetype == SPACE_VIEW3D) {				ARegion *ar = BKE_area_find_region_type(sa, RGN_TYPE_WINDOW);				if (ar && BLI_rcti_isect_pt(&ar->winrct, mx, my)) {					int mval[2] = {mx - ar->winrct.xmin,					               my - ar->winrct.ymin};					Base *base;					CTX_wm_area_set(C, sa);					CTX_wm_region_set(C, ar);					/* grr, always draw else we leave stale text */					ED_region_tag_redraw(ar);					base = ED_view3d_give_base_under_cursor(C, mval);					if (base) {						Object *ob = base->object;						ID *id = NULL;						if (ddr->idcode == ID_OB) {							id = (ID *)ob;						}						else if (ob->data) {							if (GS(((ID *)ob->data)->name) == ddr->idcode) {								id = (ID *)ob->data;							}							else {								BLI_snprintf(ddr->name, sizeof(ddr->name), "Incompatible, expected a %s",								             ddr->idcode_name);							}						}						if (id) {							BLI_snprintf(ddr->name, sizeof(ddr->name), "%s: %s",							             ddr->idcode_name, id->name + 2);							*r_id = id;						}						break;					}				}			}		}	}	CTX_wm_area_set(C, area_prev);	CTX_wm_region_set(C, ar_prev);}

/** * /brief get the ID from the screen. */static void depthdropper_depth_sample_pt(    bContext *C, DepthDropper *ddr, int mx, int my, float *r_depth){  /* we could use some clever */  bScreen *screen = CTX_wm_screen(C);  ScrArea *sa = BKE_screen_find_area_xy(screen, SPACE_TYPE_ANY, mx, my);  Scene *scene = CTX_data_scene(C);  ScrArea *area_prev = CTX_wm_area(C);  ARegion *ar_prev = CTX_wm_region(C);  ddr->name[0] = '/0';  if (sa) {    if (sa->spacetype == SPACE_VIEW3D) {      ARegion *ar = BKE_area_find_region_xy(sa, RGN_TYPE_WINDOW, mx, my);      if (ar) {        struct Depsgraph *depsgraph = CTX_data_depsgraph(C);        View3D *v3d = sa->spacedata.first;        RegionView3D *rv3d = ar->regiondata;        /* weak, we could pass in some reference point */        const float *view_co = v3d->camera ? v3d->camera->obmat[3] : rv3d->viewinv[3];        const int mval[2] = {mx - ar->winrct.xmin, my - ar->winrct.ymin};        float co[3];        CTX_wm_area_set(C, sa);        CTX_wm_region_set(C, ar);        /* grr, always draw else we leave stale text */        ED_region_tag_redraw(ar);        view3d_operator_needs_opengl(C);        if (ED_view3d_autodist(depsgraph, ar, v3d, mval, co, true, NULL)) {          const float mval_center_fl[2] = {(float)ar->winx / 2, (float)ar->winy / 2};          float co_align[3];          /* quick way to get view-center aligned point */          ED_view3d_win_to_3d(v3d, ar, co, mval_center_fl, co_align);          *r_depth = len_v3v3(view_co, co_align);          bUnit_AsString2(ddr->name,                          sizeof(ddr->name),                          (double)*r_depth,                          4,                          B_UNIT_LENGTH,                          &scene->unit,                          false);        }        else {          BLI_strncpy(ddr->name, "Nothing under cursor", sizeof(ddr->name));        }      }    }  }  CTX_wm_area_set(C, area_prev);  CTX_wm_region_set(C, ar_prev);}

static int clip_view_ndof_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event){	if (event->type != NDOF_MOTION)		return OPERATOR_CANCELLED;	else {		SpaceClip *sc = CTX_wm_space_clip(C);		ARegion *ar = CTX_wm_region(C);		float pan_vec[3];		const wmNDOFMotionData *ndof = event->customdata;		const float speed = NDOF_PIXELS_PER_SECOND;		WM_event_ndof_pan_get(ndof, pan_vec, true);		mul_v2_fl(pan_vec, (speed * ndof->dt) / sc->zoom);		pan_vec[2] *= -ndof->dt;		sclip_zoom_set_factor(C, 1.0f + pan_vec[2], NULL);		sc->xof += pan_vec[0];		sc->yof += pan_vec[1];		ED_region_tag_redraw(ar);		return OPERATOR_FINISHED;	}}

static int face_select_reveal_exec(bContext *C, wmOperator *UNUSED(op)){	Object *ob = CTX_data_active_object(C);	paintface_reveal(ob);	ED_region_tag_redraw(CTX_wm_region(C));	return OPERATOR_FINISHED;}

static int snode_bg_viewmove_modal(bContext *C, wmOperator *op, const wmEvent *event){	SpaceNode *snode = CTX_wm_space_node(C);	ARegion *ar = CTX_wm_region(C);	NodeViewMove *nvm = op->customdata;	switch (event->type) {		case MOUSEMOVE:			snode->xof -= (nvm->mvalo[0] - event->mval[0]);			snode->yof -= (nvm->mvalo[1] - event->mval[1]);			nvm->mvalo[0] = event->mval[0];			nvm->mvalo[1] = event->mval[1];			/* prevent dragging image outside of the window and losing it! */			CLAMP(snode->xof, nvm->xmin, nvm->xmax);			CLAMP(snode->yof, nvm->ymin, nvm->ymax);			ED_region_tag_redraw(ar);			WM_main_add_notifier(NC_NODE | ND_DISPLAY, NULL);			break;		case LEFTMOUSE:		case MIDDLEMOUSE:		case RIGHTMOUSE:			MEM_freeN(nvm);			op->customdata = NULL;			return OPERATOR_FINISHED;	}	return OPERATOR_RUNNING_MODAL;}

static int view_zoom_modal(bContext *C, wmOperator *op, const wmEvent *event){	ViewZoomData *vpd = op->customdata;	float delta, factor;	switch (event->type) {		case MOUSEMOVE:			delta = event->x - vpd->x + event->y - vpd->y;			if (U.uiflag & USER_ZOOM_INVERT)				delta *= -1;			factor = 1.0f + delta / 300.0f;			RNA_float_set(op->ptr, "factor", factor);			sclip_zoom_set(C, vpd->zoom * factor, vpd->location);			ED_region_tag_redraw(CTX_wm_region(C));			break;		default:			if (event->type == vpd->event_type && event->val == KM_RELEASE) {				view_zoom_exit(C, op, 0);				return OPERATOR_FINISHED;			}			break;	}	return OPERATOR_RUNNING_MODAL;}

static int face_select_all_exec(bContext *C, wmOperator *op){	Object *ob = CTX_data_active_object(C);	paintface_deselect_all_visible(ob, RNA_enum_get(op->ptr, "action"), true);	ED_region_tag_redraw(CTX_wm_region(C));	return OPERATOR_FINISHED;}

static int dopesheet_view_all_exec(bContext *C, wmOperator *UNUSED(op)){	SpaceClip *sc = CTX_wm_space_clip(C);	ARegion *ar = CTX_wm_region(C);	View2D *v2d = &ar->v2d;	MovieClip *clip = ED_space_clip_get_clip(sc);	MovieTracking *tracking = &clip->tracking;	MovieTrackingDopesheet *dopesheet = &tracking->dopesheet;	MovieTrackingDopesheetChannel *channel;	int frame_min = INT_MAX, frame_max = INT_MIN;	for (channel = dopesheet->channels.first; channel; channel = channel->next) {		frame_min = min_ii(frame_min, channel->segments[0]);		frame_max = max_ii(frame_max, channel->segments[channel->tot_segment]);	}	if (frame_min < frame_max) {		float extra;		v2d->cur.xmin = frame_min;		v2d->cur.xmax = frame_max;		/* we need an extra "buffer" factor on either side so that the endpoints are visible */		extra = 0.01f * BLI_rctf_size_x(&v2d->cur);		v2d->cur.xmin -= extra;		v2d->cur.xmax += extra;		ED_region_tag_redraw(ar);	}	return OPERATOR_FINISHED;}

static int face_select_hide_exec(bContext *C, wmOperator *op){	const bool unselected = RNA_boolean_get(op->ptr, "unselected");	Object *ob = CTX_data_active_object(C);	paintface_hide(ob, unselected);	ED_region_tag_redraw(CTX_wm_region(C));	return OPERATOR_FINISHED;}

static int paint_select_linked_pick_invoke(bContext *C, wmOperator *op, const wmEvent *event){	const bool select = !RNA_boolean_get(op->ptr, "deselect");	view3d_operator_needs_opengl(C);	paintface_select_linked(C, CTX_data_active_object(C), event->mval, select);	ED_region_tag_redraw(CTX_wm_region(C));	return OPERATOR_FINISHED;}

void wm_tag_redraw_overlay(wmWindow *win, ARegion *ar){	/* for draw triple gestures, paint cursors don't need region redraw */	if (ar && win) {		if (wm_automatic_draw_method(win) != USER_DRAW_TRIPLE)			ED_region_tag_redraw(ar);		win->screen->do_draw_paintcursor = true;	}}

/* /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// */static void do_item_rename(ARegion *ar, LiveDbTreeElement *te, ReportList *reports){    if (TE_GET_TYPE(te->item->type) != MAT_LDB_TREE_ITEM_TYPE_MATERIAL)        BKE_report(reports, RPT_WARNING, "Can edit only the material names.");    else {        *te->flag |= TE_TEXTBUT;        ED_region_tag_redraw(ar);    }} /* do_item_rename() */

/** * /brief get the ID from the screen. */static void datadropper_id_sample_pt(bContext *C, DataDropper *ddr, int mx, int my, ID **r_id){  /* we could use some clever */  bScreen *screen = CTX_wm_screen(C);  ScrArea *sa = BKE_screen_find_area_xy(screen, -1, mx, my);  ScrArea *area_prev = CTX_wm_area(C);  ARegion *ar_prev = CTX_wm_region(C);  ddr->name[0] = '/0';  if (sa) {    if (sa->spacetype == SPACE_VIEW3D) {      ARegion *ar = BKE_area_find_region_xy(sa, RGN_TYPE_WINDOW, mx, my);      if (ar) {        const int mval[2] = {mx - ar->winrct.xmin, my - ar->winrct.ymin};        Base *base;        CTX_wm_area_set(C, sa);        CTX_wm_region_set(C, ar);        /* grr, always draw else we leave stale text */        ED_region_tag_redraw(ar);        base = ED_view3d_give_base_under_cursor(C, mval);        if (base) {          Object *ob = base->object;          ID *id = NULL;          if (ddr->idcode == ID_OB) {            id = (ID *)ob;          }          else if (ob->data) {            if (GS(((ID *)ob->data)->name) == ddr->idcode) {              id = (ID *)ob->data;            }            else {              BLI_snprintf(                  ddr->name, sizeof(ddr->name), "Incompatible, expected a %s", ddr->idcode_name);            }          }          PointerRNA idptr;          RNA_id_pointer_create(id, &idptr);          if (id && RNA_property_pointer_poll(&ddr->ptr, ddr->prop, &idptr)) {            BLI_snprintf(ddr->name, sizeof(ddr->name), "%s: %s", ddr->idcode_name, id->name + 2);            *r_id = id;          }        }      }    }  }  CTX_wm_area_set(C, area_prev);  CTX_wm_region_set(C, ar_prev);}

static int vertex_color_set_exec(bContext *C, wmOperator *UNUSED(op)){	Scene *scene = CTX_data_scene(C);	Object *obact = CTX_data_active_object(C);	unsigned int paintcol = vpaint_get_current_col(scene->toolsettings->vpaint);	vpaint_fill(obact, paintcol);		ED_region_tag_redraw(CTX_wm_region(C)); // XXX - should redraw all 3D views	return OPERATOR_FINISHED;}

static int center_current_frame_exec(bContext *C, wmOperator *UNUSED(op)){	Scene *scene = CTX_data_scene(C);	ARegion *ar = CTX_wm_region(C);	ED_clip_graph_center_current_frame(scene, ar);	ED_region_tag_redraw(ar);	return OPERATOR_FINISHED;}

bool paintface_mouse_select(    struct bContext *C, Object *ob, const int mval[2], bool extend, bool deselect, bool toggle){  Mesh *me;  MPoly *mpoly_sel;  uint index;  /* Get the face under the cursor */  me = BKE_mesh_from_object(ob);  if (!ED_mesh_pick_face(C, ob, mval, ED_MESH_PICK_DEFAULT_FACE_DIST, &index)) {    return false;  }  if (index >= me->totpoly) {    return false;  }  mpoly_sel = me->mpoly + index;  if (mpoly_sel->flag & ME_HIDE) {    return false;  }  /* clear flags */  if (!extend && !deselect && !toggle) {    paintface_deselect_all_visible(C, ob, SEL_DESELECT, false);  }  me->act_face = (int)index;  if (extend) {    mpoly_sel->flag |= ME_FACE_SEL;  }  else if (deselect) {    mpoly_sel->flag &= ~ME_FACE_SEL;  }  else if (toggle) {    if (mpoly_sel->flag & ME_FACE_SEL) {      mpoly_sel->flag &= ~ME_FACE_SEL;    }    else {      mpoly_sel->flag |= ME_FACE_SEL;    }  }  else {    mpoly_sel->flag |= ME_FACE_SEL;  }  /* image window redraw */  paintface_flush_flags(C, ob, SELECT);  ED_region_tag_redraw(CTX_wm_region(C));  // XXX - should redraw all 3D views  return true;}

/* /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// */static int mat_livedb_scroll_page_down_exec(bContext *C, wmOperator *op){    ARegion *ar = CTX_wm_region(C);    int     dy  = -BLI_rcti_size_y(&ar->v2d.mask);    ar->v2d.cur.ymin += dy;    ar->v2d.cur.ymax += dy;        ED_region_tag_redraw(ar);        return OPERATOR_FINISHED;} /* mat_livedb_scroll_page_down_exec() */

/* /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// */static int mat_livedb_show_one_level_exec(bContext *C, wmOperator *op){    SpaceLDB    *slivedb    = CTX_wm_space_mat_livedb(C);    ARegion     *ar         = CTX_wm_region(C);    int         level       = mat_livedb_has_one_flag(slivedb, &slivedb->tree, TE_CLOSED, 1);    if (level) mat_livedb_openclose_level(slivedb, &slivedb->tree, 1, level, 1);        ED_region_tag_redraw(ar);        return OPERATOR_FINISHED;} /* mat_livedb_show_one_level_exec() */