labwc/include/ssd.h

/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef LABWC_SSD_H
#define LABWC_SSD_H

#include <wayland-server-core.h>

#define SSD_BUTTON_COUNT 4
#define SSD_BUTTON_WIDTH 26
#define SSD_EXTENDED_AREA 8

/*
 * Sequence these according to the order they should be processed for
 * press and hover events. Bear in mind that some of their respective
 * interactive areas overlap, so for example buttons need to come before title.
 */
enum ssd_part_type {
	LAB_SSD_NONE = 0,
	LAB_SSD_BUTTON_CLOSE,
	LAB_SSD_BUTTON_MAXIMIZE,
	LAB_SSD_BUTTON_ICONIFY,
	LAB_SSD_BUTTON_WINDOW_MENU,
	LAB_SSD_PART_TITLEBAR,
	LAB_SSD_PART_TITLE,
	LAB_SSD_PART_CORNER_TOP_LEFT,
	LAB_SSD_PART_CORNER_TOP_RIGHT,
	LAB_SSD_PART_CORNER_BOTTOM_RIGHT,
	LAB_SSD_PART_CORNER_BOTTOM_LEFT,
	LAB_SSD_PART_TOP,
	LAB_SSD_PART_RIGHT,
	LAB_SSD_PART_BOTTOM,
	LAB_SSD_PART_LEFT,
	LAB_SSD_CLIENT,
	LAB_SSD_FRAME,
	LAB_SSD_ROOT,
	LAB_SSD_MENU,
	LAB_SSD_OSD,
	LAB_SSD_LAYER_SURFACE,
	LAB_SSD_UNMANAGED,
	LAB_SSD_END_MARKER
};

/* Forward declare arguments */
struct ssd;
struct ssd_button;
struct ssd_hover_state;
struct view;
struct wlr_scene;
struct wlr_scene_node;

struct border {
	int top;
	int right;
	int bottom;
	int left;
};

/*
 * Public SSD API
 *
 * For convenience in dealing with non-SSD views, this API allows NULL
 * ssd/button/node arguments and attempts to do something sensible in
 * that case (e.g. no-op/return default values).
 *
 * NULL scene/view arguments are not allowed.
 */
struct ssd *ssd_create(struct view *view, bool active);
struct border ssd_get_margin(const struct ssd *ssd);
void ssd_set_active(struct ssd *ssd, bool active);
void ssd_update_title(struct ssd *ssd);
void ssd_update_geometry(struct ssd *ssd);
void ssd_destroy(struct ssd *ssd);

struct ssd_hover_state *ssd_hover_state_new(void);
void ssd_update_button_hover(struct wlr_scene_node *node,
	struct ssd_hover_state *hover_state);

enum ssd_part_type ssd_button_get_type(const struct ssd_button *button);
struct view *ssd_button_get_view(const struct ssd_button *button);

/* Public SSD helpers */
enum ssd_part_type ssd_at(const struct ssd *ssd,
	struct wlr_scene *scene, double lx, double ly);
enum ssd_part_type ssd_get_part_type(const struct ssd *ssd,
	struct wlr_scene_node *node);
uint32_t ssd_resize_edges(enum ssd_part_type type);
bool ssd_is_button(enum ssd_part_type type);
bool ssd_part_contains(enum ssd_part_type whole, enum ssd_part_type candidate);

/* TODO: clean up / update */
struct border ssd_thickness(struct view *view);
struct wlr_box ssd_max_extents(struct view *view);

/* SSD debug helpers */
bool ssd_debug_is_root_node(const struct ssd *ssd, struct wlr_scene_node *node);
const char *ssd_debug_get_node_name(const struct ssd *ssd,
	struct wlr_scene_node *node);

#endif /* LABWC_SSD_H */