自学教程：C++ ED_context_get_markers函数代码示例

/* Draw Scene-Markers in time window */void draw_markers_time(const bContext *C, int flag){	ListBase *markers = ED_context_get_markers(C);	View2D *v2d;	TimeMarker *marker;	Scene *scene;	if (markers == NULL)		return;	scene = CTX_data_scene(C);	v2d = UI_view2d_fromcontext(C);	/* unselected markers are drawn at the first time */	for (marker = markers->first; marker; marker = marker->next) {		if ((marker->flag & SELECT) == 0) {			draw_marker(v2d, marker, scene->r.cfra, flag);		}	}		/* selected markers are drawn later */	for (marker = markers->first; marker; marker = marker->next) {		if (marker->flag & SELECT) {			draw_marker(v2d, marker, scene->r.cfra, flag);		}	}}

static int ed_marker_make_links_scene_exec(bContext *C, wmOperator *op){	ListBase *markers = ED_context_get_markers(C);	Scene *scene_to = BLI_findlink(&CTX_data_main(C)->scene, RNA_enum_get(op->ptr, "scene"));	TimeMarker *marker, *marker_new;	if (scene_to == NULL) {		BKE_report(op->reports, RPT_ERROR, "Scene not found");		return OPERATOR_CANCELLED;	}	if (scene_to == CTX_data_scene(C)) {		BKE_report(op->reports, RPT_ERROR, "Cannot re-link markers into the same scene");		return OPERATOR_CANCELLED;	}	/* copy markers */	for (marker = markers->first; marker; marker = marker->next) {		if (marker->flag & SELECT) {			marker_new = MEM_dupallocN(marker);			marker_new->prev = marker_new->next = NULL;						BLI_addtail(&scene_to->markers, marker_new);		}	}	return OPERATOR_FINISHED;}

/* add TimeMarker at curent frame */static int ed_marker_add(bContext *C, wmOperator *UNUSED(op)){	ListBase *markers = ED_context_get_markers(C);	TimeMarker *marker;	int frame = CTX_data_scene(C)->r.cfra;		if (markers == NULL)		return OPERATOR_CANCELLED;		/* prefer not having 2 markers at the same place,	 * though the user can move them to overlap once added */	for (marker = markers->first; marker; marker = marker->next) {		if (marker->frame == frame) 			return OPERATOR_CANCELLED;	}		/* deselect all */	for (marker = markers->first; marker; marker = marker->next)		marker->flag &= ~SELECT;		marker = MEM_callocN(sizeof(TimeMarker), "TimeMarker");	marker->flag = SELECT;	marker->frame = frame;	BLI_snprintf(marker->name, sizeof(marker->name), "F_%02d", frame); // XXX - temp code only	BLI_addtail(markers, marker);		WM_event_add_notifier(C, NC_SCENE | ND_MARKERS, NULL);	WM_event_add_notifier(C, NC_ANIMATION | ND_MARKERS, NULL);		return OPERATOR_FINISHED;}

static int ed_marker_select_all_exec(bContext *C, wmOperator *op){	ListBase *markers = ED_context_get_markers(C);	TimeMarker *marker;	int action = RNA_enum_get(op->ptr, "action");	if (markers == NULL)		return OPERATOR_CANCELLED;	if (action == SEL_TOGGLE) {		action = (ED_markers_get_first_selected(markers) != NULL) ? SEL_DESELECT : SEL_SELECT;	}		for (marker = markers->first; marker; marker = marker->next) {		switch (action) {			case SEL_SELECT:				marker->flag |= SELECT;				break;			case SEL_DESELECT:				marker->flag &= ~SELECT;				break;			case SEL_INVERT:				marker->flag ^= SELECT;				break;		}	}		WM_event_add_notifier(C, NC_SCENE | ND_MARKERS, NULL);	WM_event_add_notifier(C, NC_ANIMATION | ND_MARKERS, NULL);	return OPERATOR_FINISHED;}

/* return 0 if not OK */static int ed_marker_move_init(bContext *C, wmOperator *op){	ListBase *markers = ED_context_get_markers(C);	MarkerMove *mm;	TimeMarker *marker;	int totmark = 0;	int a;	if (markers == NULL) return 0;		for (marker = markers->first; marker; marker = marker->next)		if (marker->flag & SELECT) totmark++;		if (totmark == 0) return 0;		op->customdata = mm = MEM_callocN(sizeof(MarkerMove), "Markermove");	mm->slink = CTX_wm_space_data(C);	mm->markers = markers;	mm->oldframe = MEM_callocN(totmark * sizeof(int), "MarkerMove oldframe");	initNumInput(&mm->num);	mm->num.idx_max = 0; /* one axis */	mm->num.flag |= NUM_NO_FRACTION;	mm->num.increment = 1.0f;		for (a = 0, marker = markers->first; marker; marker = marker->next) {		if (marker->flag & SELECT) {			mm->oldframe[a] = marker->frame;			a++;		}	}		return 1;}

/* Draw Scene-Markers in time window */void ED_markers_draw(const bContext *C, int flag){	ListBase *markers = ED_context_get_markers(C);	View2D *v2d;	TimeMarker *marker;	Scene *scene;	int select_pass;	int v2d_clip_range_x[2];	float font_width_max;	/* cache values */	float ypixels, xscale, yscale;	if (markers == NULL || BLI_listbase_is_empty(markers)) {		return;	}	scene = CTX_data_scene(C);	v2d = UI_view2d_fromcontext(C);	if (flag & DRAW_MARKERS_MARGIN) {		const unsigned char shade[4] = {0, 0, 0, 16};		glColor4ubv(shade);		glEnable(GL_BLEND);		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);		glRectf(v2d->cur.xmin, 0, v2d->cur.xmax, UI_MARKER_MARGIN_Y);		glDisable(GL_BLEND);	}	/* no time correction for framelen! space is drawn with old values */	ypixels = BLI_rcti_size_y(&v2d->mask);	UI_view2d_scale_get(v2d, &xscale, &yscale);	glScalef(1.0f / xscale, 1.0f, 1.0f);	/* x-bounds with offset for text (adjust for long string, avoid checking string width) */	font_width_max = (10 * UI_DPI_FAC) / xscale;	v2d_clip_range_x[0] = v2d->cur.xmin - (sizeof(marker->name) * font_width_max);	v2d_clip_range_x[1] = v2d->cur.xmax + font_width_max;	/* loop [unselected, selected] */	for (select_pass = 0; select_pass <= SELECT; select_pass += SELECT) {		/* unselected markers are drawn at the first time */		for (marker = markers->first; marker; marker = marker->next) {			if ((marker->flag & SELECT) == select_pass) {				/* bounds check */				if ((marker->frame >= v2d_clip_range_x[0]) &&				    (marker->frame <= v2d_clip_range_x[1]))				{					draw_marker(v2d, marker, scene->r.cfra, flag,					            ypixels, xscale, yscale);				}			}		}	}	glScalef(xscale, 1.0f, 1.0f);}

/* duplicate selected TimeMarkers */static void ed_marker_duplicate_apply(bContext *C){	ListBase *markers = ED_context_get_markers(C);	TimeMarker *marker, *newmarker;		if (markers == NULL) 		return;	/* go through the list of markers, duplicate selected markers and add duplicated copies	 * to the beginning of the list (unselect original markers)	 */	for (marker = markers->first; marker; marker = marker->next) {		if (marker->flag & SELECT) {			/* unselect selected marker */			marker->flag &= ~SELECT;						/* create and set up new marker */			newmarker = MEM_callocN(sizeof(TimeMarker), "TimeMarker");			newmarker->flag = SELECT;			newmarker->frame = marker->frame;			BLI_strncpy(newmarker->name, marker->name, sizeof(marker->name));			#ifdef DURIAN_CAMERA_SWITCH			newmarker->camera = marker->camera;#endif			/* new marker is added to the beginning of list */			// FIXME: bad ordering!			BLI_addhead(markers, newmarker);		}	}}

static int ed_marker_rename_invoke_wrapper(bContext *C, wmOperator *op, const wmEvent *event){	/* must initialize the marker name first if there is a marker selected */	TimeMarker *marker = ED_markers_get_first_selected(ED_context_get_markers(C));	if (marker)		RNA_string_set(op->ptr, "name", marker->name);		/* now see if the operator is usable */	return ed_markers_opwrap_invoke_custom(C, op, event, WM_operator_props_popup);}

/* special poll() which checks if there are selected markers first */static int ed_markers_poll_selected_markers(bContext *C){	ListBase *markers = ED_context_get_markers(C);		/* first things first: markers can only exist in timeline views */	if (ED_operator_animview_active(C) == 0)		return 0;			/* check if some marker is selected */	return ED_markers_get_first_selected(markers) != NULL;}

/* special poll() which checks if there are any markers at all first */static int ed_markers_poll_markers_exist(bContext *C){	ListBase *markers = ED_context_get_markers(C);		/* first things first: markers can only exist in timeline views */	if (ED_operator_animview_active(C) == 0)		return 0;			/* list of markers must exist, as well as some markers in it! */	return (markers && markers->first);}

/* rename first selected TimeMarker */static int ed_marker_rename_exec(bContext *C, wmOperator *op){	TimeMarker *marker = ED_markers_get_first_selected(ED_context_get_markers(C));	if (marker) {		RNA_string_get(op->ptr, "name", marker->name);				WM_event_add_notifier(C, NC_SCENE | ND_MARKERS, NULL);		WM_event_add_notifier(C, NC_ANIMATION | ND_MARKERS, NULL);				return OPERATOR_FINISHED;	}	else {		return OPERATOR_CANCELLED;	}}

/* return 0 if not OK */static bool ed_marker_move_init(bContext *C, wmOperator *op){	Scene *scene = CTX_data_scene(C);	ListBase *markers = ED_context_get_markers(C);	MarkerMove *mm;	TimeMarker *marker;	int a, totmark;	if (markers == NULL) {		return false;	}	for (totmark = 0, marker = markers->first; marker; marker = marker->next) {		if (marker->flag & SELECT) {			totmark++;		}	}	if (totmark == 0) {		return false;	}	op->customdata = mm = MEM_callocN(sizeof(MarkerMove), "Markermove");	mm->slink = CTX_wm_space_data(C);	mm->markers = markers;	mm->oldframe = MEM_callocN(totmark * sizeof(int), "MarkerMove oldframe");	initNumInput(&mm->num);	mm->num.idx_max = 0; /* one axis */	mm->num.val_flag[0] |= NUM_NO_FRACTION;	mm->num.unit_sys = scene->unit.system;	/* No time unit supporting frames currently... */	mm->num.unit_type[0] = ed_marker_move_use_time(mm) ? B_UNIT_TIME : B_UNIT_NONE;	for (a = 0, marker = markers->first; marker; marker = marker->next) {		if (marker->flag & SELECT) {			mm->oldframe[a] = marker->frame;			a++;		}	}	return true;}

static int ed_marker_border_select_exec(bContext *C, wmOperator *op){	View2D *v2d = UI_view2d_fromcontext(C);	ListBase *markers = ED_context_get_markers(C);	TimeMarker *marker;	int gesture_mode = RNA_int_get(op->ptr, "gesture_mode");	bool extend = RNA_boolean_get(op->ptr, "extend");	rctf rect;		WM_operator_properties_border_to_rctf(op, &rect);	UI_view2d_region_to_view_rctf(v2d, &rect, &rect);		if (markers == NULL)		return 0;		/* XXX marker context */	for (marker = markers->first; marker; marker = marker->next) {		if (BLI_rctf_isect_x(&rect, marker->frame)) {			switch (gesture_mode) {				case GESTURE_MODAL_SELECT:					marker->flag |= SELECT;					break;				case GESTURE_MODAL_DESELECT:					marker->flag &= ~SELECT;					break;			}		}		else if (!extend) {			marker->flag &= ~SELECT;		}	}		WM_event_add_notifier(C, NC_SCENE | ND_MARKERS, NULL);	WM_event_add_notifier(C, NC_ANIMATION | ND_MARKERS, NULL);	return 1;}

/* remove selected TimeMarkers */static int ed_marker_delete_exec(bContext *C, wmOperator *UNUSED(op)){	ListBase *markers = ED_context_get_markers(C);	TimeMarker *marker, *nmarker;	short changed = 0;		if (markers == NULL)		return OPERATOR_CANCELLED;		for (marker = markers->first; marker; marker = nmarker) {		nmarker = marker->next;		if (marker->flag & SELECT) {			BLI_freelinkN(markers, marker);			changed = 1;		}	}		if (changed) {		WM_event_add_notifier(C, NC_SCENE | ND_MARKERS, NULL);		WM_event_add_notifier(C, NC_ANIMATION | ND_MARKERS, NULL);	}		return OPERATOR_FINISHED;}

static int ed_marker_camera_bind_exec(bContext *C, wmOperator *UNUSED(op)){	bScreen *sc = CTX_wm_screen(C);	Scene *scene = CTX_data_scene(C);	Object *ob = CTX_data_active_object(C);	ListBase *markers = ED_context_get_markers(C);	TimeMarker *marker;	marker = ED_markers_get_first_selected(markers);	if (marker == NULL)		return OPERATOR_CANCELLED;	marker->camera = ob;	/* camera may have changes */	BKE_scene_camera_switch_update(scene);	BKE_screen_view3d_scene_sync(sc);	WM_event_add_notifier(C, NC_SCENE | ND_MARKERS, NULL);	WM_event_add_notifier(C, NC_ANIMATION | ND_MARKERS, NULL);	WM_event_add_notifier(C, NC_SCENE | NA_EDITED, scene); /* so we get view3d redraws */	return OPERATOR_FINISHED;}

static int ed_marker_select(bContext *C, const wmEvent *event, bool extend, bool camera){	ListBase *markers = ED_context_get_markers(C);	ARegion *ar = CTX_wm_region(C);	View2D *v2d = UI_view2d_fromcontext(C);	float viewx;	int x, y, cfra;		if (markers == NULL)		return OPERATOR_PASS_THROUGH;	x = event->x - ar->winrct.xmin;	y = event->y - ar->winrct.ymin;		UI_view2d_region_to_view(v2d, x, y, &viewx, NULL);		cfra = ED_markers_find_nearest_marker_time(markers, viewx);		if (extend)		select_timeline_marker_frame(markers, cfra, 1);	else		select_timeline_marker_frame(markers, cfra, 0);	#ifdef DURIAN_CAMERA_SWITCH	if (camera) {		Scene *scene = CTX_data_scene(C);		Base *base;		TimeMarker *marker;		int sel = 0;				if (!extend)			BKE_scene_base_deselect_all(scene);				for (marker = markers->first; marker; marker = marker->next) {			if (marker->frame == cfra) {				sel = (marker->flag & SELECT);				break;			}		}				for (marker = markers->first; marker; marker = marker->next) {			if (marker->camera) {				if (marker->frame == cfra) {					base = BKE_scene_base_find(scene, marker->camera);					if (base) {						ED_base_object_select(base, sel);						if (sel)							ED_base_object_activate(C, base);					}				}			}		}				WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);	}#else	(void)camera;#endif	WM_event_add_notifier(C, NC_SCENE | ND_MARKERS, NULL);	WM_event_add_notifier(C, NC_ANIMATION | ND_MARKERS, NULL);	/* allowing tweaks, but needs OPERATOR_FINISHED, otherwise renaming fails... [#25987] */	return OPERATOR_FINISHED | OPERATOR_PASS_THROUGH;}