Sets our main struct and passes it to the parent class
Warning gdk_gc_new has been deprecated since version 2.22 and should not be used in newly-written code. Use Cairo for rendering. Create a new graphics context with default values.
Warning gdk_gc_new_with_values has been deprecated since version 2.22 and should not be used in newly-written code. Use Cairo for rendering. Create a new GC with the given initial values.
Warning gdk_gc_copy has been deprecated since version 2.22 and should not be used in newly-written code. Use Cairo for drawing. cairo_save() and cairo_restore() can be helpful in cases where you'd have copied a GdkGC. Copy the set of values from one graphics context onto another graphics context.
Warning gdk_gc_get_colormap has been deprecated since version 2.22 and should not be used in newly-written code. There is no replacement. Cairo handles colormaps automatically, so there is no need to care about them. Retrieves the colormap for a given GC, if it exists. A GC will have a colormap if the drawable for which it was created has a colormap, or if a colormap was set explicitely with gdk_gc_set_colormap.
Warning gdk_gc_get_screen is deprecated and should not be used in newly-written code. Gets the GdkScreen for which gc was created Since 2.2
the main Gtk struct as a void*
Warning gdk_gc_get_values has been deprecated since version 2.22 and should not be used in newly-written code. Use Cairo for rendering. Retrieves the current values from a graphics context. Note that only the pixel values of the values->foreground and values->background are filled, use gdk_colormap_query_color() to obtain the rgb values if you need them.
Warning gdk_gc_offset has been deprecated since version 2.22 and should not be used in newly-written code. There is no direct replacement, as this is just a convenience function for gdk_gc_set_ts_origin and gdk_gc_set_clip_origin(). Offset attributes such as the clip and tile-stipple origins of the GC so that drawing at x - x_offset, y - y_offset with the offset GC has the same effect as drawing at x, y with the original GC.
Warning gdk_gc_set_background has been deprecated since version 2.22 and should not be used in newly-written code. Use gdk_cairo_set_source_color() to use a GdkColor as the source in Cairo. Note that if you want to draw a background and a foreground in Cairo, you need to call drawing functions (like cairo_fill()) twice. Sets the background color for a graphics context. Note that this function uses color->pixel, use gdk_gc_set_rgb_bg_color() to specify the background color as red, green, blue components.
Warning gdk_gc_set_clip_mask has been deprecated since version 2.22 and should not be used in newly-written code. Use cairo_mask() instead. Sets the clip mask for a graphics context from a bitmap. The clip mask is interpreted relative to the clip origin. (See gdk_gc_set_clip_origin()).
Warning gdk_gc_set_clip_origin has been deprecated since version 2.22 and should not be used in newly-written code. Use cairo_translate() before applying the clip path in Cairo. Sets the origin of the clip mask. The coordinates are interpreted relative to the upper-left corner of the destination drawable of the current operation.
Warning gdk_gc_set_clip_rectangle has been deprecated since version 2.22 and should not be used in newly-written code. Use cairo_rectangle() and cairo_clip() in Cairo. Sets the clip mask for a graphics context from a rectangle. The clip mask is interpreted relative to the clip origin. (See gdk_gc_set_clip_origin()).
Warning gdk_gc_set_clip_region has been deprecated since version 2.22 and should not be used in newly-written code. Use gdk_cairo_region() and cairo_clip() in Cairo. Sets the clip mask for a graphics context from a region structure. The clip mask is interpreted relative to the clip origin. (See gdk_gc_set_clip_origin()).
Warning gdk_gc_set_colormap has been deprecated since version 2.22 and should not be used in newly-written code. There is no replacement. Cairo handles colormaps automatically, so there is no need to care about them. Sets the colormap for the GC to the given colormap. The depth of the colormap's visual must match the depth of the drawable for which the GC was created.
Warning gdk_gc_set_dashes has been deprecated since version 2.22 and should not be used in newly-written code. Use cairo_set_dash() to set the dash in Cairo. Sets the way dashed-lines are drawn. Lines will be drawn with alternating on and off segments of the lengths specified in dash_list. The manner in which the on and off segments are drawn is determined by the line_style value of the GC. (This can be changed with gdk_gc_set_line_attributes().) The dash_offset defines the phase of the pattern, specifying how many pixels into the dash-list the pattern should actually begin.
Warning gdk_gc_set_exposures has been deprecated since version 2.22 and should not be used in newly-written code. There is no replacement. If you need to control exposures, you must use drawing operations of the underlying window system or use gdk_window_invalidate_rect(). Cairo will never generate exposures. Sets whether copying non-visible portions of a drawable using this graphics context generate exposure events for the corresponding regions of the destination drawable. (See gdk_draw_drawable()).
Warning gdk_gc_set_fill has been deprecated since version 2.22 and should not be used in newly-written code. You can achieve tiling in Cairo by using cairo_pattern_set_extend() on the source. For stippling, see the deprecation comments on gdk_gc_set_stipple(). Set the fill mode for a graphics context.
Warning gdk_gc_set_font is deprecated and should not be used in newly-written code. Sets the font for a graphics context. (Note that all text-drawing functions in GDK take a font argument; the value set here is used when that argument is NULL.)
Warning gdk_gc_set_foreground has been deprecated since version 2.22 and should not be used in newly-written code. Use gdk_cairo_set_source_color() to use a GdkColor as the source in Cairo. Sets the foreground color for a graphics context. Note that this function uses color->pixel, use gdk_gc_set_rgb_fg_color() to specify the foreground color as red, green, blue components.
Warning gdk_gc_set_function has been deprecated since version 2.22 and should not be used in newly-written code. Use cairo_set_operator() with Cairo. Determines how the current pixel values and the pixel values being drawn are combined to produce the final pixel values.
Warning gdk_gc_set_line_attributes has been deprecated since version 2.22 and should not be used in newly-written code. Use the Cairo functions cairo_set_line_width(), cairo_set_line_join(), cairo_set_line_cap() and cairo_set_dash() to affect the stroking behavior in Cairo. Keep in mind that the default attributes of a cairo_t are different from the default attributes of a GdkGC. Sets various attributes of how lines are drawn. See the corresponding members of GdkGCValues for full explanations of the arguments.
Warning gdk_gc_set_rgb_bg_color has been deprecated since version 2.22 and should not be used in newly-written code. Use gdk_cairo_set_source_color() instead. Set the background color of a GC using an unallocated color. The pixel value for the color will be determined using GdkRGB. If the colormap for the GC has not previously been initialized for GdkRGB, then for pseudo-color colormaps (colormaps with a small modifiable number of colors), a colorcube will be allocated in the colormap. Calling this function for a GC without a colormap is an error.
Warning gdk_gc_set_rgb_fg_color has been deprecated since version 2.22 and should not be used in newly-written code. Use gdk_cairo_set_source_color() instead. Set the foreground color of a GC using an unallocated color. The pixel value for the color will be determined using GdkRGB. If the colormap for the GC has not previously been initialized for GdkRGB, then for pseudo-color colormaps (colormaps with a small modifiable number of colors), a colorcube will be allocated in the colormap. Calling this function for a GC without a colormap is an error.
Warning gdk_gc_set_stipple has been deprecated since version 2.22 and should not be used in newly-written code. Stippling has no direct replacement in Cairo. If you want to achieve an identical look, you can use the stipple bitmap as a mask. Most likely, this involves rendering the source to an intermediate surface using cairo_push_group() first, so that you can then use cairo_mask() to achieve the stippled look. Set the stipple bitmap for a graphics context. The stipple will only be used if the fill mode is GDK_STIPPLED or GDK_OPAQUE_STIPPLED.
Warning gdk_gc_set_subwindow has been deprecated since version 2.22 and should not be used in newly-written code. There is no replacement. If you need to control subwindows, you must use drawing operations of the underlying window system manually. Cairo will always use GDK_INCLUDE_INFERIORS on sources and masks and GDK_CLIP_BY_CHILDREN on targets. Sets how drawing with this GC on a window will affect child windows of that window.
Warning gdk_gc_set_tile has been deprecated since version 2.22 and should not be used in newly-written code. The following code snippet sets a tiling GdkPixmap
Warning gdk_gc_set_ts_origin has been deprecated since version 2.22 and should not be used in newly-written code. You can set the origin for tiles and stipples in Cairo by changing the source's matrix using cairo_pattern_set_matrix(). Or you can specify it with gdk_cairo_set_source_pixmap() as shown in the example for gdk_gc_set_tile(). Set the origin when using tiles or stipples with the GC. The tile or stipple will be aligned such that the upper left corner of the tile or stipple will coincide with this point.
Warning gdk_gc_set_values has been deprecated since version 2.22 and should not be used in newly-written code. Use Cairo for rendering. Sets attributes of a graphics context in bulk. For each flag set in values_mask, the corresponding field will be read from values and set as the new value for gc. If you're only setting a few values on gc, calling individual "setter" functions is likely more convenient.
the main Gtk struct
the main Gtk struct
the main Gtk struct as a void*
Gets a D Object from the objects table of associations.
The notify signal is emitted on an object when one of its properties has been changed. Note that getting this signal doesn't guarantee that the value of the property has actually changed, it may also be emitted when the setter for the property is called to reinstate the previous value. This signal is typically used to obtain change notification for a single property, by specifying the property name as a detail in the It is important to note that you must use canonical parameter names as detail strings for the notify signal. See Also GParamSpecObject, g_param_spec_object()
Installs a new property. This is usually done in the class initializer. Note that it is possible to redefine a property in a derived class, by installing a property with the same name. This can be useful at times, e.g. to change the range of allowed values or the default value.
Installs new properties from an array of GParamSpecs. This is usually done in the class initializer. The property id of each property is the index of each GParamSpec in the pspecs array. The property id of 0 is treated specially by GObject and it should not be used to store a GParamSpec. This function should be used if you plan to use a static array of GParamSpecs and g_object_notify_by_pspec(). For instance, this Since 2.26
Looks up the GParamSpec for a property of a class.
Get an array of GParamSpec* for all properties of a class.
Registers property_id as referring to a property with the name name in a parent class or in an interface implemented by oclass. This allows this class to override a property implementation in a parent class or to provide the implementation of a property from an interface. Note Internally, overriding is implemented by creating a property of type GParamSpecOverride; generally operations that query the properties of the object class, such as g_object_class_find_property() or g_object_class_list_properties() will return the overridden property. However, in one case, the construct_properties argument of the constructor virtual function, the GParamSpecOverride is passed instead, so that the param_id field of the GParamSpec will be correct. For virtually all uses, this makes no difference. If you need to get the overridden property, you can call g_param_spec_get_redirect_target(). Since 2.4
Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property. This function is meant to be called from the interface's default vtable initialization function (the class_init member of GTypeInfo.) It must not be called after after class_init has been called for any object types implementing this interface. Since 2.4
Find the GParamSpec with the given name for an interface. Generally, the interface vtable passed in as g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek(). Since 2.4
Lists the properties of an interface.Generally, the interface vtable passed in as g_iface will be the default vtable from g_type_default_interface_ref(), or, if you know the interface has already been loaded, g_type_default_interface_peek(). Since 2.4
Increases the reference count of object.
Decreases the reference count of object. When its reference count drops to 0, the object is finalized (i.e. its memory is freed).
Increase the reference count of object, and possibly remove the floating reference, if object has a floating reference. In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one. Since 2.10
Clears a reference to a GObject. object_ptr must not be NULL. If the reference is NULL then this function does nothing. Otherwise, the reference count of the object is decreased and the pointer is set to NULL. This function is threadsafe and modifies the pointer atomically, using memory barriers where needed. A macro is also included that allows this function to be used without pointer casts. Since 2.28
Checks whether object has a floating reference. Since 2.10
This function is intended for GObject implementations to re-enforce a floating object reference. Doing this is seldomly required: all GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink(). Since 2.10
Adds a weak reference callback to an object. Weak references are used for notification when an object is finalized. They are called "weak references" because they allow you to safely hold a pointer to an object without calling g_object_ref() (g_object_ref() adds a strong reference, that is, forces the object to stay alive).
Removes a weak reference callback to an object.
Adds a weak reference from weak_pointer to object to indicate that the pointer located at weak_pointer_location is only valid during the lifetime of object. When the object is finalized, weak_pointer will be set to NULL.
Removes a weak reference from object that was previously added using g_object_add_weak_pointer(). The weak_pointer_location has to match the one used with g_object_add_weak_pointer().
Increases the reference count of the object by one and sets a callback to be called when all other references to the object are dropped, or when this is already the last reference to the object and another reference is established. This functionality is intended for binding object to a proxy object managed by another memory manager. This is done with two paired references: the strong reference added by g_object_add_toggle_ref() and a reverse reference to the proxy object which is either a strong reference or weak reference. The setup is that when there are no other references to object, only a weak reference is held in the reverse direction from object to the proxy object, but when there are other references held to object, a strong reference is held. The notify callback is called when the reference from object to the proxy object should be toggled from strong to weak (is_last_ref true) or weak to strong (is_last_ref false). Since a (normal) reference must be held to the object before calling g_object_toggle_ref(), the initial state of the reverse link is always strong. Multiple toggle references may be added to the same gobject, however if there are multiple toggle references to an object, none of them will ever be notified until all but one are removed. For this reason, you should only ever use a toggle reference if there is important state in the proxy object. Since 2.8
Removes a reference added with g_object_add_toggle_ref(). The reference count of the object is decreased by one. Since 2.8
Emits a "notify" signal for the property property_name on object. When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.
Emits a "notify" signal for the property specified by pspec on object. This function omits the property name lookup, hence it is faster than g_object_notify(). One way to avoid using g_object_notify() from within the class that registered the properties, and using g_object_notify_by_pspec() instead, is to store the GParamSpec used with Since 2.26
Increases the freeze count on object. If the freeze count is non-zero, the emission of "notify" signals on object is stopped. The signals are queued until the freeze count is decreased to zero. This is necessary for accessors that modify multiple properties to prevent premature notification while the object is still being modified.
Reverts the effect of a previous call to g_object_freeze_notify(). The freeze count is decreased on object and when it reaches zero, all queued "notify" signals are emitted. It is an error to call this function when the freeze count is zero.
Gets a named field from the objects table of associations (see g_object_set_data()).
Each object carries around a table of associations from strings to pointers. This function lets you set an association. If the object already had an association with that name, the old association will be destroyed.
Like g_object_set_data() except it adds notification for when the association is destroyed, either by setting it to a different value or when the object is destroyed. Note that the destroy callback is not called if data is NULL.
Remove a specified datum from the object's data associations, without invoking the association's destroy handler.
This function gets back user data pointers stored via g_object_set_qdata().
This sets an opaque, named pointer on an object. The name is specified through a GQuark (retrived e.g. via g_quark_from_static_string()), and the pointer can be gotten back from the object with g_object_get_qdata() until the object is finalized. Setting a previously set user data pointer, overrides (frees) the old pointer set, using NULL as pointer essentially removes the data stored.
This function works like g_object_set_qdata(), but in addition, a void (*destroy) (gpointer) function may be specified which is called with data as argument when the object is finalized, or the data is being overwritten by a call to g_object_set_qdata() with the same quark.
This function gets back user data pointers stored via g_object_set_qdata() and removes the data from object without invoking its destroy() function (if any was set). Usually, calling this function is only required to update
Sets a property on an object.
Gets a property of an object. value must have been initialized to the expected type of the property (or a type to which the expected type can be transformed) using g_value_init(). In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset(). Note that g_object_get_property() is really intended for language bindings, g_object_get() is much more convenient for C programming.
Sets properties on an object.
Gets properties of an object. In general, a copy is made of the property contents and the caller is responsible for freeing the memory in the appropriate manner for the type, for instance by calling g_free() or g_object_unref(). See g_object_get().
This function essentially limits the life time of the closure to the life time of the object. That is, when the object is finalized, the closure is invalidated by calling g_closure_invalidate() on it, in order to prevent invocations of the closure with a finalized (nonexisting) object. Also, g_object_ref() and g_object_unref() are added as marshal guards to the closure, to ensure that an extra reference count is held on object during invocation of the closure. Usually, this function will be called on closures that use this object as closure data.
Releases all references to other objects. This can be used to break reference cycles. This functions should only be called from object system implementations.
Description All drawing operations in GDK take a graphics context (GC) argument. A graphics context encapsulates information about the way things are drawn, such as the foreground color or line width. By using graphics contexts, the number of arguments to each drawing call is greatly reduced, and communication overhead is minimized, since identical arguments do not need to be passed repeatedly. Most values of a graphics context can be set at creation time by using gdk_gc_new_with_values(), or can be set one-by-one using functions such as gdk_gc_set_foreground(). A few of the values in the GC, such as the dash pattern, can only be set by the latter method.