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libccc Reference Manual | ![]() |
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Canvas ItemsCanvas Items — |
CcItem; CcItemClass; CcItem* cc_item_new (void); void cc_item_append (CcItem *self, CcItem *child); void cc_item_dirty (CcItem *self); gdouble cc_item_distance (CcItem *self, gdouble x, gdouble y, CcItem **found); void cc_item_insert (CcItem *self, CcItem *child, gint position); void cc_item_remove (CcItem *self, CcItem *child); void cc_item_render (CcItem *self, CcView *view, cairo_t *cr); void cc_item_set_grid_aligned (CcItem *self, gboolean grid_aligned); enum CcItemFlags; #define CC_ITEM_FLAGS (i) #define CC_ITEM_DISPOSED (i) #define CC_ITEM_GRID_ALIGNED (i) #define CC_ITEM_NO_SEARCH_CHILDREN (i) #define CC_ITEM_SET_FLAGS (i,m) #define CC_ITEM_UNSET_FLAGS (i,m)
"all-bounds-changed" void user_function (CcItem *ccitem, CcView *arg1, CcDRect *arg2, gpointer user_data); "button-press-event" gboolean user_function (CcItem *self, CcView *view, GdkEventButton *event, gpointer user_data); "button-release-event" gboolean user_function (CcItem *self, CcView *view, GdkEventButton *event, gpointer user_data); "dirty" void user_function (CcItem *self, CcView *dirty_region, CcDRect *arg2, gpointer user_data); "enter-notify-event" gboolean user_function (CcItem *self, CcView *view, GdkEventCrossing *event, gpointer user_data); "event" gboolean user_function (CcItem *self, CcView *view, GdkEvent *event, gpointer user_data); "focus" gboolean user_function (CcItem *self, CcView *view, GtkDirectionType dir, gpointer user_data); "focus-enter" gboolean user_function (CcItem *ccitem, CcView *arg1, GdkEvent *event, gpointer user_data); "focus-leave" gboolean user_function (CcItem *ccitem, CcView *arg1, GdkEvent *event, gpointer user_data); "key-press-event" gboolean user_function (CcItem *ccitem, CcView *arg1, GdkEventKey *event, gpointer user_data); "key-release-event" gboolean user_function (CcItem *ccitem, CcView *arg1, GdkEventKey *event, gpointer user_data); "leave-notify-event" gboolean user_function (CcItem *self, CcView *view, GdkEventCrossing *event, gpointer user_data); "motion-notify-event" gboolean user_function (CcItem *self, CcView *view, GdkEventMotion *event, gpointer user_data);
typedef struct { GInitiallyUnownedClass base_class; /* vtable */ gdouble (*distance) (CcItem * self, gdouble x, gdouble y, CcItem **found); void (*notify_child_bounds) (CcItem * self, CcItem * child, CcView * view, CcDRect const * all_bounds); void (*render) (CcItem * self, CcView * view, cairo_t * cr); void (*update_bounds) (CcItem * self, CcView const * view, gpointer user_data); /* signals */ gboolean (*button_press_event) (CcItem * self, CcView * view, GdkEventButton * event); gboolean (*button_release_event)(CcItem * self, CcView * view, GdkEventButton * event); gboolean (*enter_notify_event) (CcItem * self, CcView * view, GdkEventCrossing* event); gboolean (*event) (CcItem * self, CcView * view, GdkEvent * event); gboolean (*focus) (CcItem * self, CcView * view, GtkDirectionType dir); gboolean (*focus_enter) (CcItem * self, CcView * view, GdkEventFocus * event); gboolean (*focus_leave) (CcItem * self, CcView * view, GdkEventFocus * focus); gboolean (*key_press_event) (CcItem * item, CcView * view, GdkEventKey * event); gboolean (*key_release_event) (CcItem * item, CcView * view, GdkEventKey * event); gboolean (*leave_notify_event) (CcItem * self, CcView * view, GdkEventCrossing* event); gboolean (*motion_notify_event) (CcItem * self, CcView * view, GdkEventMotion * event); } CcItemClass;
CcItem* cc_item_new (void);
Create a new CcItem that can be used to group several items together.
Returns : | a new CcItem. |
void cc_item_append (CcItem *self, CcItem *child);
Insert an item at the end of this item. A CcItem can serve as a container for several items.
void cc_item_dirty (CcItem *self);
Let emit a signal to tell all the views that it needs to be redrawn.
self : |
a CcItem |
gdouble cc_item_distance (CcItem *self, gdouble x, gdouble y, CcItem **found);
Calculates the distance from self
to (x
,y
). If (x
,y
) is within self
or
one of its children found
is set to the matching element.
void cc_item_insert (CcItem *self, CcItem *child, gint position);
Inserts child
at position
into self
.
void cc_item_remove (CcItem *self, CcItem *child);
Removes child
from self
. Does nothing if child
was not a child of self
or if child
is a child of one of self
's children.
void cc_item_render (CcItem *self, CcView *view, cairo_t *cr);
Renders self
to cr
which is supposed to be a cairo context of view
as
the transformation matrix of view
will be used for rendering.
void cc_item_set_grid_aligned (CcItem *self, gboolean grid_aligned);
Sets self
to be rendered grid-aligned if grid_aligned
is TRUE
, sets it to
be allowed to render fuzzyly if FALSE
.
self : |
a CcItem |
grid_aligned : |
a gboolean |
typedef enum { CC_CAN_FOCUS = 1 << 1, CC_DISPOSED = 1 << 2, CC_GRID_ALIGNED = 1 << 3, CC_NO_SEARCH_CHILDREN = 1 << 4 } CcItemFlags;
CC_CAN_FOCUS |
|
CC_DISPOSED |
specifies whether dispose has already been run on an item. |
CC_GRID_ALIGNED |
specifies whether an item should be rendered to match an existing grid. |
CC_NO_SEARCH_CHILDREN |
specifies whether calls like cc_item_distance()
should be forwarded to children.
|
#define CC_ITEM_FLAGS(i) (CC_ITEM(i)->flags)
Get the flags which are set on the CcItem i
.
i : |
a CcItem |
#define CC_ITEM_DISPOSED(i) ((CC_ITEM_FLAGS(i) & CC_DISPOSED) != 0)
Queries the CcItem i
whether it has the CC_DISPOSED
flag set. This is
very useful in the dispose handler for the GObject derived types. This flag
gets set automatically if you chain up your dispose calls correctly.
i : |
a CcItem |
#define CC_ITEM_GRID_ALIGNED(i) ((CC_ITEM_FLAGS(i) & CC_GRID_ALIGNED) != 0)
Queries the CcItem i
whether it has the CC_GRID_ALIGNED
flag set.
i : |
a CcItem |
#define CC_ITEM_NO_SEARCH_CHILDREN(i) ((CC_ITEM_FLAGS(i) & CC_NO_SEARCH_CHILDREN) != 0)
Queries the CcItem i
whether it has the CC_NO_SEARCH_CHILDEN
flag set.
i : |
a CcItem |
#define CC_ITEM_SET_FLAGS(i,m) G_STMT_START{ (CC_ITEM_FLAGS(i) |= (m)); }G_STMT_END
Sets on i
the CcItemFlags that have been specified in m
.
i : |
a CcItem |
m : |
a CcItemFlags mask |
#define CC_ITEM_UNSET_FLAGS(i,m) G_STMT_START{ (CC_ITEM_FLAGS(i) &= ~(m)); }G_STMT_END
Unsets from i
the CcItemFlags that have been specified in m
.
i : |
a CcItem |
m : |
a CcItemFlags mask |
void user_function (CcItem *ccitem, CcView *arg1, CcDRect *arg2, gpointer user_data);
ccitem : |
the object which received the signal. |
arg1 : |
|
arg2 : |
|
user_data : |
user data set when the signal handler was connected. |
gboolean user_function (CcItem *self, CcView *view, GdkEventButton *event, gpointer user_data);
This signal gets emitted when a mouse button got pressed on top of an element.
self : |
a CcItem |
view : |
the CcView which emitted this event |
event : |
a GdkEventButton with coordinates translated to canvas coordinates. |
user_data : |
user data set when the signal handler was connected. |
Returns : |
TRUE to stop other signal handlers from being called.
|
gboolean user_function (CcItem *self, CcView *view, GdkEventButton *event, gpointer user_data);
This signal gets emitted when a mouse button got released on top of an item.
self : |
a CcItem |
view : |
the CcView which emitted this event |
event : |
a GdkEventButton with coordinates translated to canvas coordinates |
user_data : |
user data set when the signal handler was connected. |
Returns : |
TRUE to stop other signal handlers from being called.
|
void user_function (CcItem *self, CcView *dirty_region, CcDRect *arg2, gpointer user_data);
This signal gets emitted when an item changes. It's used to request redraws of the affected items.
gboolean user_function (CcItem *self, CcView *view, GdkEventCrossing *event, gpointer user_data);
This signal gets emitted when the mouse pointer enters an item.
self : |
a CcItem |
view : |
the CcView which emitted this event |
event : |
a GdkEventCrossing with x and y coordinates translated into canvas coordinates |
user_data : |
user data set when the signal handler was connected. |
Returns : |
TRUE to stop other signal handlers from being invoked.
|
gboolean user_function (CcItem *self, CcView *view, GdkEvent *event, gpointer user_data);
This signal catches all events before they are distributes into more specified signals.
self : |
a CcItem |
view : |
the CcView which emitted this event |
event : |
the event that got emitted (with canvas coordinates) |
user_data : |
user data set when the signal handler was connected. |
Returns : |
TRUE to stop other signal handlers from being called.
|
gboolean user_function (CcItem *self, CcView *view, GtkDirectionType dir, gpointer user_data);
This signal gets emitted when a focus event on the view happended to let focus-handling happen.
self : |
a CcItem |
view : |
a CcView |
dir : |
the focus direction |
user_data : |
user data set when the signal handler was connected. |
Returns : |
TRUE to stop other signal handlers from being called (such
as the one which lets the focus leave the canvas view)
|
gboolean user_function (CcItem *ccitem, CcView *arg1, GdkEvent *event, gpointer user_data);
ccitem : |
the object which received the signal. |
arg1 : |
|
event : |
|
user_data : |
user data set when the signal handler was connected. |
Returns : |
gboolean user_function (CcItem *ccitem, CcView *arg1, GdkEvent *event, gpointer user_data);
ccitem : |
the object which received the signal. |
arg1 : |
|
event : |
|
user_data : |
user data set when the signal handler was connected. |
Returns : |
gboolean user_function (CcItem *ccitem, CcView *arg1, GdkEventKey *event, gpointer user_data);
ccitem : |
the object which received the signal. |
arg1 : |
|
event : |
|
user_data : |
user data set when the signal handler was connected. |
Returns : |
gboolean user_function (CcItem *ccitem, CcView *arg1, GdkEventKey *event, gpointer user_data);
ccitem : |
the object which received the signal. |
arg1 : |
|
event : |
|
user_data : |
user data set when the signal handler was connected. |
Returns : |
gboolean user_function (CcItem *self, CcView *view, GdkEventCrossing *event, gpointer user_data);
This signal gets emitted when the mouse pointer leaves an element.
self : |
a CcItem |
view : |
the CcView which emitted this event |
event : |
a GdkEventCrossing |
user_data : |
user data set when the signal handler was connected. |
Returns : |
TRUE to stop other signal handlers from being invoked.
|
gboolean user_function (CcItem *self, CcView *view, GdkEventMotion *event, gpointer user_data);
This signal gets emitted when the pointer (mouse cursor) moves while being over this item.
self : |
a CcItem |
view : |
the CcView which emitted this event |
event : |
the event that got emitted (with canvas coordinates) |
user_data : |
user data set when the signal handler was connected. |
Returns : |
TRUE to stop other signal handlers from being called.
|
<< Canvas Items | Rectangles >> |