raven/src/node.h

#ifndef _UI__NODE_H
#define _UI__NODE_H

#include <stdint.h>
#include <unistd.h>
#include "rect.h"
#include <cairo.h>

enum UIEvent {
    UI_EVENT_REPAINT,
    UI_EVENT_RELAYOUT,
    UI_EVENT_GET_WIDTH,
    UI_EVENT_GET_HEIGHT,
    UI_EVENT_HOVERED,
    UI_EVENT_UNHOVERED,
    UI_EVENT_PRESSED,
    UI_EVENT_UNPRESSED,
    UI_EVENT_DESTROY,

    UI_EVENT_TIMER_END,

    UI_EVENT_BUTTON_LEFT_UPDATE, // d == 1 if pressed, d == 0 if released
    UI_EVENT_BUTTON_RIGHT_UPDATE, // d == 1 if pressed, d == 0 if released
    UI_EVENT_SCROLL, // p (double*) = delta
    UI_EVENT_KEY_DOWN, // d (unsigned int) = keycode, p (struct xkb_state*) = xkb state
};

enum UISizePolicy {
    UI_SIZE_POLICY_DYNAMIC,
    UI_SIZE_POLICY_GROW,
    UI_SIZE_POLICY_FIXED,
    UI_SIZE_POLICY_STATIC
};

enum UIDirection {
    UI_DIRECTION_HORIZONTAL,
    UI_DIRECTION_VERTICAL
};

#define UI_NODE_COMPONENT (1 << 0)
#define UI_NODE_RETAINS_PRESS (1 << 1)

typedef struct UINode {
    const char *text;
    UIRect rect;
    double window_rel_x, window_rel_y;
    struct UINode *parent;
    struct UINode **nodes;
    struct UIWindow *window;
    cairo_t *drw;
    int nodes_count, nodes_capacity;
    uint32_t flags;
    enum UISizePolicy width_policy;
    enum UISizePolicy height_policy;

    int (*handle)(struct UINode *node, enum UIEvent ev, size_t d, void *p);
    int (*handle_proto)(struct UINode *node, enum UIEvent ev, size_t d, void *p);
} UINode;

int node_dispatch(UINode *node, enum UIEvent ev, size_t d, void *p);
UINode *node_by_point(UINode *root, double x, double y);
void node_init(UINode *node);
void node_free(UINode *node);
void node_repaint(UINode *node, UIRect *rect, bool do_group, double window_rel_x, double window_rel_y);
UINode *node_attach(UINode *parent, UINode *node);
UINode *node_new(UINode *parent, const char *text);
void node_dump(UINode *node, int depth);
void node_request_relayout(UINode *node);

#endif // _UI__NODE_H