Momentum-Apps/applications/gui/gui.h

#pragma once

#include "view_port.h"
#include "canvas.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Gui layers */
typedef enum {
    GuiLayerNone, /* Special layer for internal use only */

    GuiLayerStatusBarLeft, /* Status bar left-side layer, auto-layout */
    GuiLayerStatusBarRight, /* Status bar right-side layer, auto-layout */
    GuiLayerMain, /* Main layer, status bar is shown */
    GuiLayerFullscreen, /* Fullscreen layer */

    GuiLayerMAX /* Don't use or move, special value */
} GuiLayer;

/* Gui frame buffer callback */
typedef void (*GuiCanvasCommitCallback)(uint8_t* data, size_t size, void* context);

typedef struct Gui Gui;

/*
 * Add view_port to view_port tree
 * @remarks thread safe
 */
void gui_add_view_port(Gui* gui, ViewPort* view_port, GuiLayer layer);

/*
 * Remove view_port from rendering tree
 * @remarks thread safe
 */
void gui_remove_view_port(Gui* gui, ViewPort* view_port);

/* Send ViewPort to the front
 * Places selected ViewPort to the top of the drawing stack
 * @param gui - Gui instance
 * @param view_port - ViewPort instance
 */
void gui_send_view_port_front(Gui* gui, ViewPort* view_port);

/* Send ViewPort to the back
 * Places selected ViewPort to the bottom of the drawing stack
 * @param gui - Gui instance
 * @param view_port - ViewPort instance
 */
void gui_send_view_port_back(Gui* gui, ViewPort* view_port);

/* Set gui canvas commit callback
 * This callback will be called upon Canvas commit
 * Callback dispatched from GUI thread and is time critical
 * @param gui - Gui instance
 * @param callback - GuiCanvasCommitCallback
 */
void gui_set_framebuffer_callback(Gui* gui, GuiCanvasCommitCallback callback);

/* Set gui canvas commit callback context
 * @param gui - Gui instance
 * @param context - pointer to context
 */
void gui_set_framebuffer_callback_context(Gui* gui, void* context);

#ifdef __cplusplus
}
#endif