gtkmm: Gtk::WidgetPaintable Class Reference
Drawing a widget elsewhere. More...
#include <gtkmm/widgetpaintable.h>
Public Member Functions | |
WidgetPaintable (WidgetPaintable&& src) noexcept | |
WidgetPaintable& | operator= (WidgetPaintable&& src) noexcept |
~WidgetPaintable () noexcept override | |
GtkWidgetPaintable* | gobj () |
Provides access to the underlying C GObject. More... | |
const GtkWidgetPaintable* | gobj () const |
Provides access to the underlying C GObject. More... | |
GtkWidgetPaintable* | gobj_copy () |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More... | |
Widget* | get_widget () |
Returns the widget that is observed or nullptr if none. More... | |
const Widget* | get_widget () const |
Returns the widget that is observed or nullptr if none. More... | |
void | set_widget (Widget& widget) |
Sets the widget that should be observed. More... | |
void | unset_widget () |
Glib::PropertyProxy< Widget* > | property_widget () |
The observed widget or nullptr if none. More... | |
Glib::PropertyProxy_ReadOnly< Widget* > | property_widget () const |
The observed widget or nullptr if none. More... | |
Public Member Functions inherited from Glib::Object | |
Object (const Object &)=delete | |
Object & | operator= (const Object &)=delete |
Object (Object &&src) noexcept | |
Object & | operator= (Object &&src) noexcept |
void * | get_data (const QueryQuark &key) |
void | set_data (const Quark &key, void *data) |
void | set_data (const Quark &key, void *data, DestroyNotify notify) |
void | remove_data (const QueryQuark &quark) |
void * | steal_data (const QueryQuark &quark) |
Glib::RefPtr< Glib::Object > | wrap (GObject *object, bool take_copy=false) |
Public Member Functions inherited from Glib::ObjectBase | |
ObjectBase (const ObjectBase &)=delete | |
ObjectBase & | operator= (const ObjectBase &)=delete |
void | set_property_value (const Glib::ustring &property_name, const Glib::ValueBase &value) |
void | get_property_value (const Glib::ustring &property_name, Glib::ValueBase &value) const |
void | set_property (const Glib::ustring &property_name, const PropertyType &value) |
void | get_property (const Glib::ustring &property_name, PropertyType &value) const |
PropertyType | get_property (const Glib::ustring &property_name) const |
sigc::connection | connect_property_changed (const Glib::ustring &property_name, const sigc::slot< void()> &slot) |
sigc::connection | connect_property_changed (const Glib::ustring &property_name, sigc::slot< void()> &&slot) |
void | freeze_notify () |
void | thaw_notify () |
virtual void | reference () const |
virtual void | unreference () const |
GObject * | gobj () |
const GObject * | gobj () const |
GObject * | gobj_copy () const |
Public Member Functions inherited from sigc::trackable | |
trackable () noexcept | |
trackable (const trackable &src) noexcept | |
trackable (trackable &&src) noexcept | |
~trackable () | |
void | add_destroy_notify_callback (notifiable *data, func_destroy_notify func) const |
void | notify_callbacks () |
trackable & | operator= (const trackable &src) |
trackable & | operator= (trackable &&src) noexcept |
void | remove_destroy_notify_callback (notifiable *data) const |
Public Member Functions inherited from Gdk::Paintable | |
Paintable (Paintable&& src) noexcept | |
Paintable& | operator= (Paintable&& src) noexcept |
~Paintable () noexcept override | |
GdkPaintable* | gobj () |
Provides access to the underlying C GObject. More... | |
const GdkPaintable* | gobj () const |
Provides access to the underlying C GObject. More... | |
void | snapshot (const Glib::RefPtr< Gdk::Snapshot >& snapshot, double width, double height) |
Snapshots the given paintable with the given width and height at the current (0,0) offset of the snapshot. More... | |
Glib::RefPtr< const Paintable > | get_current_image () const |
Gets an immutable paintable for the current contents displayed by paintable. More... | |
Flags | get_flags () const |
Get flags for the paintable. More... | |
int | get_intrinsic_width () const |
Gets the preferred width the paintable would like to be displayed at. More... | |
int | get_intrinsic_height () const |
Gets the preferred height the paintable would like to be displayed at. More... | |
double | get_intrinsic_aspect_ratio () const |
Gets the preferred aspect ratio the paintable would like to be displayed at. More... | |
void | compute_concrete_size (double specified_width, double specified_height, double default_width, double default_height, double& concrete_width, double& concrete_height) const |
Applies the sizing algorithm outlined in https://drafts.csswg.org/css-images-3/#default-sizing to the given paintable. More... | |
void | invalidate_contents () |
Called by implementations of Gdk::Paintable to invalidate their contents. More... | |
void | invalidate_size () |
Called by implementations of Gdk::Paintable to invalidate their size. More... | |
Glib::SignalProxy< void()> | signal_invalidate_contents () |
Glib::SignalProxy< void()> | signal_invalidate_size () |
Public Member Functions inherited from Glib::Interface | |
Interface () | |
Interface (Interface &&src) noexcept | |
Interface & | operator= (Interface &&src) noexcept |
Interface (const Glib::Interface_Class &interface_class) | |
Interface (GObject *castitem) | |
~Interface () noexcept override | |
Interface (const Interface &)=delete | |
Interface & | operator= (const Interface &)=delete |
GObject * | gobj () |
const GObject * | gobj () const |
Static Public Member Functions | |
static GType | get_type () |
Get the GType for this class, for use with the underlying GObject type system. More... | |
static Glib::RefPtr< WidgetPaintable > | create () |
static Glib::RefPtr< WidgetPaintable > | create (Widget& widget) |
Static Public Member Functions inherited from Gdk::Paintable | |
static void | add_interface (GType gtype_implementer) |
static GType | get_type () |
Get the GType for this class, for use with the underlying GObject type system. More... | |
Protected Member Functions | |
WidgetPaintable () | |
WidgetPaintable (Widget& widget) | |
Protected Member Functions inherited from Glib::Object | |
Object () | |
Object (const Glib::ConstructParams &construct_params) | |
Object (GObject *castitem) | |
~Object () noexcept override | |
Protected Member Functions inherited from Glib::ObjectBase | |
ObjectBase () | |
ObjectBase (const char *custom_type_name) | |
ObjectBase (const std::type_info &custom_type_info) | |
ObjectBase (ObjectBase &&src) noexcept | |
ObjectBase & | operator= (ObjectBase &&src) noexcept |
virtual | ~ObjectBase () noexcept=0 |
void | initialize (GObject *castitem) |
void | initialize_move (GObject *castitem, Glib::ObjectBase *previous_wrapper) |
Protected Member Functions inherited from Gdk::Paintable | |
Paintable () | |
You should derive from this class to use it. More... | |
virtual void | snapshot_vfunc (const Glib::RefPtr< Gdk::Snapshot >&snapshot, double width, double height) |
virtual Glib::RefPtr< Paintable > | get_current_image_vfunc () const |
virtual Flags | get_flags_vfunc () const |
virtual int | get_intrinsic_width_vfunc () const |
virtual int | get_intrinsic_height_vfunc () const |
virtual double | get_intrinsic_aspect_ratio_vfunc () const |
Related Functions | |
(Note that these are not member functions.) | |
Glib::RefPtr< Gtk::WidgetPaintable > | wrap (GtkWidgetPaintable* object, bool take_copy=false) |
A Glib::wrap() method for this object. More... | |
Related Functions inherited from Gdk::Paintable | |
Glib::RefPtr< Gdk::Paintable > | wrap (GdkPaintable* object, bool take_copy=false) |
A Glib::wrap() method for this object. More... | |
Additional Inherited Members | |
Public Types inherited from Glib::Object | |
typedef void(*)(gpointer data | DestroyNotify) |
Public Types inherited from sigc::trackable | |
typedef internal::func_destroy_notify | func_destroy_notify |
Public Types inherited from sigc::notifiable | |
typedef internal::func_destroy_notify | func_destroy_notify |
Public Types inherited from Gdk::Paintable | |
enum | Flags { Flags::STATIC_SIZE = 1 << 0, Flags::STATIC_CONTENTS = 1 << 1 } |
Flags about this object. More... | |
Detailed Description
Drawing a widget elsewhere.
Gtk::WidgetPaintable is an implementation of the Gdk::Paintable interface that allows displaying the contents of a Gtk::Widget.
WidgetPaintable will also take care of the widget not being in a state where it can be drawn (like when it isn't shown) and just draw nothing or where it does not have a size (like when it is hidden) and report no size in that case.
Of course, WidgetPaintable allows you to monitor widgets for size changes by emitting Gdk::Paintable::signal_invalidate_size() whenever the size of the widget changes as well as for visual changes by emitting Gdk::Paintable::signal_invalidate_contents() whenever the widget changes.
You can of course use a Gtk::WidgetPaintable everywhere a Gdk::Paintable is allowed, including using it on a Gtk::Picture (or one of its parents) that it was set on itself via Gtk::Picture::set_paintable(). The paintable will take care of recursion when this happens. If you do this however, ensure Gtk::Picture::property_can_shrink() is set to true
or you might end up with an infinitely growing widget.
Constructor & Destructor Documentation
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noexcept |
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overridenoexcept |
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protected |
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explicitprotected |
Member Function Documentation
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static |
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static |
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static |
Get the GType for this class, for use with the underlying GObject type system.
Widget* Gtk::WidgetPaintable::get_widget | ( | ) |
Returns the widget that is observed or nullptr
if none.
- Returns
- The observed widget.
const Widget* Gtk::WidgetPaintable::get_widget | ( | ) | const |
Returns the widget that is observed or nullptr
if none.
- Returns
- The observed widget.
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inline |
Provides access to the underlying C GObject.
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inline |
Provides access to the underlying C GObject.
GtkWidgetPaintable* Gtk::WidgetPaintable::gobj_copy | ( | ) |
Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
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noexcept |
Glib::PropertyProxy< Widget* > Gtk::WidgetPaintable::property_widget | ( | ) |
The observed widget or nullptr
if none.
- Returns
- A PropertyProxy that allows you to get or set the value of the property, or receive notification when the value of the property changes.
Glib::PropertyProxy_ReadOnly< Widget* > Gtk::WidgetPaintable::property_widget | ( | ) | const |
The observed widget or nullptr
if none.
- Returns
- A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.
void Gtk::WidgetPaintable::set_widget | ( | Widget& | widget | ) |
Sets the widget that should be observed.
- Parameters
-
widget The widget to observe or nullptr
.
void Gtk::WidgetPaintable::unset_widget | ( | ) |
Friends And Related Function Documentation
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related |
A Glib::wrap() method for this object.
- Parameters
-
object The C instance. take_copy False if the result should take ownership of the C instance. True if it should take a new copy or ref.
- Returns
- A C++ instance that wraps this C instance.