dw_widget.h

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#ifndef __DW_WIDGET_H__
#define __DW_WIDGET_H__

#include <gtk/gtkobject.h>
#include <gtk/gtkwidget.h>
#include <gdk/gdktypes.h>

#include "dw_style.h"

#ifdef __cplusplus
extern "C" {
#endif				/* __cplusplus */

#define DW_TYPE_WIDGET          (a_Dw_widget_get_type ())
#define DW_WIDGET(obj)          GTK_CHECK_CAST (obj, DW_TYPE_WIDGET, DwWidget)
#define DW_WIDGET_CLASS(klass)  GTK_CHECK_CLASS_CAST (klass, DW_TYPE_WIDGET, \
                                   DwWidgetClass)
#define DW_IS_WIDGET(obj)       GTK_CHECK_TYPE (obj, DW_TYPE_WIDGET)


#define DW_WIDGET_SET_FLAGS(wid, flag)    (DW_WIDGET(wid)->flags |= (flag))
#define DW_WIDGET_UNSET_FLAGS(wid, flag)  (DW_WIDGET(wid)->flags &= ~(flag))

#define DW_WIDGET_NEEDS_RESIZE(wid)   (DW_WIDGET(wid)->flags & DW_NEEDS_RESIZE)
#define DW_WIDGET_NEEDS_ALLOCATE(wid) (DW_WIDGET(wid)->flags & \
                                       DW_NEEDS_ALLOCATE)
#define DW_WIDGET_REALIZED(wid)       (DW_WIDGET(wid)->flags & DW_REALIZED)

#define DW_NEEDS_RESIZE   (1 << 0)
#define DW_NEEDS_ALLOCATE (1 << 1)
#define DW_REALIZED       (1 << 2)

typedef struct _DwAllocation DwAllocation;
typedef struct _DwRequisition DwRequisition;
typedef struct _DwRectangle DwRectangle;

typedef struct _DwWidget DwWidget;
typedef struct _DwWidgetClass DwWidgetClass;

#define DW_PAINT_DEFAULT_BGND   0xd6d6c0


struct _DwRectangle {
	gint32 x;
	gint32 y;
	gint32 width;
	gint32 height;
};


struct _DwAllocation {
	gint32 x;
	gint32 y;
	gint32 width;
	gint32 ascent;
	gint32 descent;
};


struct _DwRequisition {
	gint32 width;
	gint32 ascent;
	gint32 descent;
};


struct _DwWidget {
	GtkObject object;

	/* the parent widget, NULL for top-level widgets */
	DwWidget *parent;

	/* the viewport in which the widget is shown */
	GtkWidget *viewport;

	/* currently only DW_NEEDS_RESIZE and DW_REALIZED */
	gint flags;

	/* the current allocation: size and position, always relative to the
	   scrolled area! */
	DwAllocation allocation;

	/* a_Dw_widget_size_request stores the result of the last call of
	   Dw_xxx_size_request here, don't read this directly, but call
	   a_Dw_widget_size_request. */
	DwRequisition requisition;

	/* This is used by a_Dw_widget_set_usize and a_Dw_widget_size_request to
	   override the widgets normal requisition */
	DwRequisition user_requisition;

	/* The window the widget should draw into (in viewport coordinates). It is
	   set when the widget is realized.
	   Currently it is GTK_LAYOUT(widget->viewport)->bin_window, but this may
	   be changed, but this should only affect the "core" (dw_gtk_viewport.*
	   and dw_widget.*). */
	GdkWindow *window;

	/* Anchors of the widget.
	 * Key: gchar*, has to be stored elsewhere
	 * Value: int (pixel offset [1 based]) */
	GHashTable *anchors_table;

	GdkCursor *cursor;	/* todo: move this to style */
	DwStyle *style;
};


struct _DwWidgetClass {
	GtkObjectClass parent_class;

	void (*size_request) (DwWidget * widget, DwRequisition * requisition);
	void (*size_allocate) (DwWidget * widget, DwAllocation * allocation);
	void (*set_width) (DwWidget * widget, gint32 width);
	void (*set_ascent) (DwWidget * widget, gint32 ascent);
	void (*set_descent) (DwWidget * widget, gint32 descent);
	void (*draw) (DwWidget * widget, DwRectangle * area, GdkEventExpose * event);

	void (*realize) (DwWidget * widget);
	void (*unrealize) (DwWidget * widget);

	 gint(*button_press_event) (DwWidget * widget, gint32 x, gint32 y, GdkEventButton * event);
	 gint(*button_release_event) (DwWidget * widget, gint32 x, gint32 y, GdkEventButton * event);
	 gint(*motion_notify_event) (DwWidget * widget, gint32 x, gint32 y, GdkEventMotion * event);
	 gint(*enter_notify_event) (DwWidget * widget, GdkEventMotion * event);
	 gint(*leave_notify_event) (DwWidget * widget, GdkEventMotion * event);
};


GtkType a_Dw_widget_get_type(void);

void a_Dw_widget_size_request(DwWidget * widget, DwRequisition * requisition);
void a_Dw_widget_size_allocate(DwWidget * widget, DwAllocation * allocation);
void a_Dw_widget_set_width(DwWidget * widget, gint32 width);
void a_Dw_widget_set_ascent(DwWidget * widget, gint32 ascent);
void a_Dw_widget_set_descent(DwWidget * widget, gint32 descent);
void a_Dw_widget_draw(DwWidget * widget, DwRectangle * area, GdkEventExpose * event);
void a_Dw_widget_realize(DwWidget * widget);
void a_Dw_widget_unrealize(DwWidget * widget);

void a_Dw_widget_set_usize(DwWidget * widget, gint32 width, gint32 ascent, gint32 descent);

void a_Dw_widget_set_style(DwWidget * widget, DwStyle * style);
void a_Dw_widget_set_bg_color(DwWidget * widget, gint32 color);
void a_Dw_widget_set_cursor(DwWidget * widget, GdkCursor * cursor);

DwWidget *a_Dw_widget_get_toplevel(DwWidget * widget);

void a_Dw_widget_scroll_to(DwWidget * widget, int pos);

/* Only for Dw module */
gint Dw_rectangle_intersect(DwRectangle * src1, DwRectangle * src2, DwRectangle * dest);
gint Dw_widget_intersect(DwWidget * widget, DwRectangle * area, DwRectangle * intersection);
void Dw_widget_set_parent(DwWidget * widget, DwWidget * parent);

gint32 Dw_widget_x_viewport_to_world(DwWidget * widget, gint16 viewport_x);
gint32 Dw_widget_y_viewport_to_world(DwWidget * widget, gint16 viewport_y);
gint16 Dw_widget_x_world_to_viewport(DwWidget * widget, gint32 world_x);
gint16 Dw_widget_y_world_to_viewport(DwWidget * widget, gint32 world_y);

gint Dw_widget_mouse_event(DwWidget * widget, GtkWidget * viewwidget, gint32 x, gint32 y, GdkEvent * event);
void Dw_widget_queue_draw(DwWidget * widget);
void Dw_widget_queue_draw_area(DwWidget * widget, gint32 x, gint32 y, gint32 width, gint32 height);
void Dw_widget_queue_clear(DwWidget * widget);
void Dw_widget_queue_clear_area(DwWidget * widget, gint32 x, gint32 y, gint32 width, gint32 height);
void Dw_widget_queue_resize(DwWidget * widget);

void Dw_widget_set_anchor(DwWidget * widget, gchar * name, int pos);

#ifdef __cplusplus
}
#endif				/* __cplusplus */
#endif				/* __DW_WIDGET_H__ */