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Basic frame widget

Basic frame widget provides a frame with only a background color.

Data Structures

struct  wtk_basic_frame
 Basic frame control struct. More...


typedef bool(* wtk_basic_frame_command_handler_t )(struct wtk_basic_frame *basic_frame, win_command_t command_data)
 Basic frame command event handler callback. More...
typedef void(* wtk_basic_frame_draw_handler_t )(struct win_window *win, struct win_clip_region const *clip)
 Basic frame draw event handler callback. More...


struct win_windowwtk_basic_frame_as_child (struct wtk_basic_frame *basic_frame)
 Get reference to basic frame window. More...
struct wtk_basic_framewtk_basic_frame_create (struct win_window *parent, const struct win_area *area, struct gfx_bitmap *background, wtk_basic_frame_draw_handler_t draw_handler, wtk_basic_frame_command_handler_t frame_handler, void *custom_data)
 Create basic frame widget. More...
void * wtk_basic_frame_get_custom_data (const struct wtk_basic_frame *basic_frame)
 Get basic frame custom data. More...
static bool wtk_basic_frame_handler (struct win_window *win, enum win_event_type type, const void *data)
 Basic frame event handler. More...

typedef bool(* wtk_basic_frame_command_handler_t)(struct wtk_basic_frame *basic_frame, win_command_t command_data)

Basic frame command event handler callback.

The basic frame command event handler callback is used to handle command events from widgets inside the basic frame. Command events are typically queued when the user has given some input to a widget. Examples are pushing a button widget or checking a check box widget.

The maximum stack usage can be affected by the implementation of the event handler. The handler will be called from within the event handling of the window system. This event handling is done recursively to traverse all child windows connected to the window root.
basic_framePointer to the basic frame which contains the widget that generated the event.
command_dataThe command data that was set for the specific widget. This is typically an ID for the widget or a pointer to data needed by the widget. This is widget-specific.
True if the basic frame and it's children should be destroyed, false otherwise.
typedef void(* wtk_basic_frame_draw_handler_t)(struct win_window *win, struct win_clip_region const *clip)

Basic frame draw event handler callback.

The basic frame draw event handler callback can be used to draw simple graphical display elements without the need for implementing a custom widget. The handler is called to redraw the full or a subregion of basic frame after the background for the widget has been drawn.

If CONFIG_GFX_USE_CLIPPING has been set the clipping region is set before the handler is called.

The maximum stack usage can be affected by the implementation of the event handler. The handler will be called from within the event handling of the window system. This event handling is done recursively to traverse all child windows connected to the window root.
winPointer to the window of the basic frame widget to be drawn.
clipRegion of the basic frame to be drawn in global display coordinates.

struct win_window* wtk_basic_frame_as_child ( struct wtk_basic_frame basic_frame)

Get reference to basic frame window.

This function returns a reference to the window that should be used when managing the widget, such as move, resize, destroy and reparenting.

basic_frameBasic frame widget to manage.
Window to be used for managing the basic frame.

References Assert, and wtk_basic_frame::win.

struct wtk_basic_frame* wtk_basic_frame_create ( struct win_window parent,
const struct win_area area,
struct gfx_bitmap background,
wtk_basic_frame_draw_handler_t  draw_handler,
wtk_basic_frame_command_handler_t  frame_handler,
void *  custom_data 

Create basic frame widget.

This function creates a new basic frame widget. It allocates required memory and intializes necessary windows to create the widget. If there is not enough memory, the function returns NULL.

To destroy the widget and all its contents, and free its memory, call win_destroy() on the basic frame's child reference, given by wtk_basic_frame_as_child(), like this: "win_destroy(wtk_basic_frame_as_child(my_frame_ptr));".

parentParent window.
areaArea of the internal contents.
backgroundPointer to background bitmap for frame. NULL for transparent background. When background is transparent the parent window will automatically be redrawn when the basic frame is drawn.
draw_handlerDraw event handler. NULL for no handler.
frame_handlerCommand event handler. NULL for no handler.
custom_dataOptional custom data link for application's command events.
Pointer to basic frame, or NULL if failed.

References win_attributes::area, Assert, win_attributes::background, win_attributes::behavior, win_attributes::custom, wtk_basic_frame::custom_data, wtk_basic_frame::draw_handler, win_attributes::event_handler, wtk_basic_frame::frame_handler, membag_alloc(), membag_free(), NULL, wtk_basic_frame::win, WIN_BEHAVIOR_REDRAW_PARENT, win_create(), and wtk_basic_frame_handler().

void* wtk_basic_frame_get_custom_data ( const struct wtk_basic_frame basic_frame)

Get basic frame custom data.

This function returns the custom data from the basic frame's attributes. The custom data can be used for e.g. linking to associated applications.

basic_framePointer to basic frame.
Copy of the custom data.

References Assert, and wtk_basic_frame::custom_data.

static bool wtk_basic_frame_handler ( struct win_window win,
enum win_event_type  type,
const void *  data 

Basic frame event handler.

This function is the window event handler for basic frame widgets. It handles all events sent to the windows composing the widget.

winWindow receiving the event.
typeThe event type.
dataCustom data, depending on event type.
True if the event was recognized and accepted.

References wtk_basic_frame::draw_handler, wtk_basic_frame::frame_handler, membag_free(), wtk_basic_frame::win, win_destroy(), WIN_EVENT_COMMAND, WIN_EVENT_DESTROY, WIN_EVENT_DRAW, WIN_EVENT_POINTER, and win_get_custom_data().

Referenced by wtk_basic_frame_create().