wschod/game/src/ui/widget_core.h

#pragma once

#include <glib-2.0/glib.h>
#include <cglm/cglm.h>

#include "widget_fw.h"
#include "widget_render.h"
#include "widget_layout.h"
#include "widget_style.h"
#include "widget_ops.h"

#include "../util.h"
#include "../resources.h"
#include "../flags.h"
#include "../gl/mesh.h"
#include "../gl/program.h"

#define WIDGET_FOREACH_CHILD(widget, i, child)				\
  for (unsigned int i = 0; i < widget->children->len &&			\
	 ((child = g_array_index(widget->children, Widget *, i)), 1); ++i)

typedef enum WidgetKind
  {
    WIDGET_PLAIN,
    WIDGET_LABEL,
    WIDGET_SCROLLBAR,
    WIDGET_PROGRESS,
    WIDGET_ENTRY,
    
    WIDGET_MULTILINE_TEXT,

    WIDGET_CONTAINER,
    WIDGET_SCROLLABLE,
    WIDGET_FLOWBOX,

    WIDGET_WINDOW
  } WidgetKind;

typedef enum WidgetIcon
  {
    ICON_NONE = -1,
    ICON_CHECKBOX_UNCHECKED = 0,
    ICON_CHECKBOX_CHECKED,
    ICON_MINUS,
    ICON_PLUS,
    ICON_ARROW_LEFT,
    ICON_ARROW_RIGHT,
    ICON_ARROW_UP,
    ICON_ARROW_DOWN
  } WidgetIcon;

typedef enum WidgetEvent
  {
    EVENT_TICK,
    EVENT_LEFT_DOWN,
    EVENT_LEFT_UP,
    EVENT_RIGHT_DOWN,
    EVENT_RIGHT_UP,
    EVENT_MOUSE_ENTER,
    EVENT_MOUSE_LEAVE,
    EVENT_MOUSE_MOVE,
    EVENT_SCROLL_UP,
    EVENT_SCROLL_DOWN,
    EVENT_FOCUS_GAINED,
    EVENT_FOCUS_LOST,
    EVENT_TEXT_INPUT,
    
    EVENT_COUNT
  } WidgetEvent;

typedef enum TextAlignment
  {
    TEXT_ALIGN_LEFT,
    TEXT_ALIGN_CENTER,
    TEXT_ALIGN_RIGHT
  } TextAlignment;

typedef struct LabelWidget
{
  GString *text;
  TextAlignment text_alignment;
} LabelWidget;

typedef struct ScrollbarWidget
{
  struct Widget *target;
  gboolean horizontal;
  /* Used for input. */
  gboolean dragging;
  float drag_offset;
} ScrollbarWidget;

typedef struct ProgressWidget
{
  gboolean horizontal;
  float min, max, *ptr;
} ProgressWidget;

typedef struct EntryWidget
{
  GString *ghost_text;
  GString *content;
  /* cursor_position is in UTF-8 characters. */
  int cursor_position;
} EntryWidget;

typedef struct MultilineTextWidget
{
  GString *text;
  GArray *lines;
  float line_height;
  TextAlignment text_alignment;
} MultilineTextWidget;

typedef struct ContainerWidget
{
  gboolean horizontal;
} ContainerWidget;

typedef struct ScrollableWidget
{
  gboolean layout_horizontal;
  gboolean layout_vertical;
  
  float scroll_amount;
  vec2 scroll_position;
  vec2 content_size;
} ScrollableWidget;

typedef struct FlowBoxWidget
{
  gboolean horizontal;
} FlowBoxWidget;

typedef struct WindowWidget
{
  GString *title;
  float titlebar_height;
  gboolean moving, resizing;
  vec2 drag_offset;
  gboolean resizable_h, resizable_v;
} WindowWidget;

typedef struct Widget
{
  struct Widget *parent;
  GArray *children;

  WidgetKind kind;
  union
  {
    LabelWidget label;
    ScrollbarWidget scrollbar;
    ProgressWidget progress;
    MultilineTextWidget multiline_text;
    EntryWidget entry;

    ContainerWidget container;
    ScrollableWidget scrollable;
    FlowBoxWidget flowbox;

    WindowWidget window;
  };

  gboolean visible;
  gboolean layout_dirty;
  gboolean hovered, clicked, focused;
  
  vec2 position;
  vec2 size;
  float layout_weight, layout_padding, layout_spacing;
  float aspect_ratio;

  WidgetStyle *style;
  WidgetIcon icon;

  GString *tooltip;
  
  void (*do_layout) (struct Widget *);
  void (*do_render) (struct Widget *, mat4, int);
  
  void (*on_event[EVENT_COUNT]) (struct Widget *, SDL_Event *sdl_event, void *);
  void *event_data[EVENT_COUNT];

  void (*on_key[SDL_SCANCODE_COUNT]) (struct Widget *, SDL_Event *null, void *);
  void *key_data[SDL_SCANCODE_COUNT];
} Widget;

Widget *Widget_plain_new ();
Widget *Widget_test_new (float size);
Widget *Widget_label_new (const char *text, TextAlignment alignment);
Widget *Widget_scrollbar_new (Widget *target, gboolean horizontal);
Widget *Widget_progress_new (gboolean horizontal, float min, float max, float *ptr);
Widget *Widget_multiline_text_new (const char *text, float line_height, TextAlignment alignment);
Widget *Widget_entry_new (const char *ghost_text);
Widget *Widget_container_new (gboolean horizontal);
Widget *Widget_scrollable_new ();
Widget *Widget_flowbox_new (gboolean horizontal);
Widget *Widget_window_new (const char *title, float titlebar_height);

void Widget_add_child (Widget *parent, Widget *child);
void Widget_add_child_weighed (Widget *parent, Widget *child,
			       float layout_weight);
void Widget_add_child_flowbox (Widget *parent, Widget *child,
			       float layout_weight, float cross_axis_size);

void Widget_set_on_event (Widget *widget, WidgetEvent event, void (*on_event) (Widget *, SDL_Event *, void *), void *userdata);
void Widget_set_on_key (Widget *widget, SDL_Scancode key, void (*on_key) (Widget *, SDL_Event *, void *), void *userdata);
void Widget_set_style (Widget *widget, WidgetStyle style);
void Widget_set_all_backgrounds (Widget *widget, vec4 color);

void Widget_label_set_text (Widget *widget, const char *text);
void Widget_label_printf (Widget *widget, const char *format, ...);

void Widget_multiline_text_set_text (Widget *widget, const char *text);

void Widget_entry_input_text (Widget *widget, const char *text);

void Widget_scrollable_scroll (Widget *widget, vec2 direction);

gboolean wcond_tooltip (Widget *widget, void *userdata);
gboolean wcond_event (Widget *widget, void *event);
gboolean wcond_any (Widget *widget, void *userdata);
Widget *Widget_find_xy_cond (Widget *widget, vec2 point, gboolean (*cond_func) (Widget *, void *), void *userdata);

void Widget_tick (Widget *widget);
void Widget_render (Widget *widget, mat4 projection, int window_height);
void Widget_free (Widget *widget);

void Widget_dump (Widget *widget, int depth);