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gtkmm: Gtk::DrawingArea Class Reference

A widget for custom user interface elements. More...

#include <gtkmm/drawingarea.h>

Inheritance diagram for Gtk::DrawingArea:
Inheritance graph
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Public Types

using SlotDraw = sigc::slot< void(const Cairo::RefPtr< Cairo::Context >&, int, int)>
 Whenever the drawing area needs to redraw, this slot will be called. More...

 
- Public Types inherited from Gtk::Widget
using SlotTick = sigc::slot< bool(const Glib::RefPtr< Gdk::FrameClock >&)>
 Callback type for adding a function to update animations. More...

 
- 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 Gtk::Accessible
enum  Role {

  Role::ALERT,

  Role::ALERT_DIALOG,

  Role::BANNER,

  Role::BUTTON,

  Role::CAPTION,

  Role::CELL,

  Role::CHECKBOX,

  Role::COLUMN_HEADER,

  Role::COMBO_BOX,

  Role::COMMAND,

  Role::COMPOSITE,

  Role::DIALOG,

  Role::DOCUMENT,

  Role::FEED,

  Role::FORM,

  Role::GENERIC,

  Role::GRID,

  Role::GRID_CELL,

  Role::GROUP,

  Role::HEADING,

  Role::IMG,

  Role::INPUT,

  Role::LABEL,

  Role::LANDMARK,

  Role::LEGEND,

  Role::LINK,

  Role::LIST,

  Role::LIST_BOX,

  Role::LIST_ITEM,

  Role::LOG,

  Role::MAIN,

  Role::MARQUEE,

  Role::MATH,

  Role::METER,

  Role::MENU,

  Role::MENU_BAR,

  Role::MENU_ITEM,

  Role::MENU_ITEM_CHECKBOX,

  Role::MENU_ITEM_RADIO,

  Role::NAVIGATION,

  Role::NONE,

  Role::NOTE,

  Role::OPTION,

  Role::PRESENTATION,

  Role::PROGRESS_BAR,

  Role::RADIO,

  Role::RADIO_GROUP,

  Role::RANGE,

  Role::REGION,

  Role::ROW,

  Role::ROW_GROUP,

  Role::ROW_HEADER,

  Role::SCROLLBAR,

  Role::SEARCH,

  Role::SEARCH_BOX,

  Role::SECTION,

  Role::SECTION_HEAD,

  Role::SELECT,

  Role::SEPARATOR,

  Role::SLIDER,

  Role::SPIN_BUTTON,

  Role::STATUS,

  Role::STRUCTURE,

  Role::SWITCH,

  Role::TAB,

  Role::TABLE,

  Role::TAB_LIST,

  Role::TAB_PANEL,

  Role::TEXT_BOX,

  Role::TIME,

  Role::TIMER,

  Role::TOOLBAR,

  Role::TOOLTIP,

  Role::TREE,

  Role::TREE_GRID,

  Role::TREE_ITEM,

  Role::WIDGET,

  Role::WINDOW

}
 The accessible role for a Gtk::Accessible implementation. More...

 
enum  State {

  State::BUSY,

  State::CHECKED,

  State::DISABLED,

  State::EXPANDED,

  State::HIDDEN,

  State::INVALID,

  State::PRESSED,

  State::SELECTED

}
 The possible accessible states of a Gtk::Accessible. More...

 
enum  Property {

  Property::AUTOCOMPLETE,

  Property::DESCRIPTION,

  Property::HAS_POPUP,

  Property::KEY_SHORTCUTS,

  Property::LABEL,

  Property::LEVEL,

  Property::MODAL,

  Property::MULTI_LINE,

  Property::MULTI_SELECTABLE,

  Property::ORIENTATION,

  Property::PLACEHOLDER,

  Property::READ_ONLY,

  Property::REQUIRED,

  Property::ROLE_DESCRIPTION,

  Property::SORT,

  Property::VALUE_MAX,

  Property::VALUE_MIN,

  Property::VALUE_NOW,

  Property::VALUE_TEXT

}
 The possible accessible properties of a Gtk::Accessible. More...

 
enum  Relation {

  Relation::ACTIVE_DESCENDANT,

  Relation::COL_COUNT,

  Relation::COL_INDEX,

  Relation::COL_INDEX_TEXT,

  Relation::COL_SPAN,

  Relation::CONTROLS,

  Relation::DESCRIBED_BY,

  Relation::DETAILS,

  Relation::ERROR_MESSAGE,

  Relation::FLOW_TO,

  Relation::LABELLED_BY,

  Relation::OWNS,

  Relation::POS_IN_SET,

  Relation::ROW_COUNT,

  Relation::ROW_INDEX,

  Relation::ROW_INDEX_TEXT,

  Relation::ROW_SPAN,

  Relation::SET_SIZE

}
 The possible accessible relations of a Gtk::Accessible. More...

 

Public Member Functions

 DrawingArea (DrawingArea&& src) noexcept
 
DrawingArea& operator= (DrawingArea&& src) noexcept
 
 DrawingArea (const DrawingArea&)=delete
 
DrawingArea& operator= (const DrawingArea&)=delete
 
 ~DrawingArea () noexcept override
 
GtkDrawingArea* gobj ()
 Provides access to the underlying C GObject. More...

 
const GtkDrawingArea* gobj () const
 Provides access to the underlying C GObject. More...

 
 DrawingArea ()
 
void set_content_width (int width)
 Sets the desired width of the contents of the drawing area. More...

 
int get_content_width () const
 Retrieves the value previously set via set_content_width(). More...

 
void set_content_height (int width)
 Sets the desired height of the contents of the drawing area. More...

 
int get_content_height () const
 Retrieves the value previously set via set_content_height(). More...

 
void set_draw_func (const SlotDraw& slot)
 Sets a draw function. More...

 
Glib::SignalProxy< void(int, int)> signal_resize ()
 
Glib::PropertyProxy< int > property_content_width ()
 The content width. More...

 
Glib::PropertyProxy_ReadOnly< int > property_content_width () const
 The content width. More...

 
Glib::PropertyProxy< int > property_content_height ()
 The content height. More...

 
Glib::PropertyProxy_ReadOnly< int > property_content_height () const
 The content height. More...

 
- Public Member Functions inherited from Gtk::Widget
 Widget (Widget&& src) noexcept
 
Widget& operator= (Widget&& src) noexcept
 
 Widget (const Widget&)=delete
 
Widget& operator= (const Widget&)=delete
 
 ~Widget () noexcept override
 Destroys the widget. More...

 
GtkWidget* gobj ()
 Provides access to the underlying C GObject. More...

 
const GtkWidget* gobj () const
 Provides access to the underlying C GObject. More...

 
Glib::RefPtr< ConstraintTarget > make_refptr_constrainttarget ()
 Converts this widget to a reference counted Gtk::ConstraintTarget. More...

 
Glib::RefPtr< const ConstraintTarget > make_refptr_constrainttarget () const
 Converts this widget to a reference counted Gtk::ConstraintTarget. More...

 
void show ()
 Flags a widget to be displayed. More...

 
void hide ()
 Reverses the effects of show(), causing the widget to be hidden (invisible to the user). More...

 
void queue_draw ()
 Schedules this widget to be redrawn in paint phase of the current or the next frame. More...

 
void queue_resize ()
 This function is only for use in widget implementations. More...

 
void queue_allocate ()
 This function is only for use in widget implementations. More...

 
void size_allocate (const Allocation& allocation, int baseline)
 This is a simple form of allocate() that takes the new position of widget as part of allocation. More...

 
SizeRequestMode get_request_mode () const
 Gets whether the widget prefers a height-for-width layout or a width-for-height layout. More...

 
void measure (Orientation orientation, int for_size, int& minimum, int& natural, int& minimum_baseline, int& natural_baseline) const
 Measures widget in the orientation orientation and for the given for_size. More...

 
void get_preferred_size (Requisition& minimum_size, Requisition& natural_size) const
 Retrieves the minimum and natural size of a widget, taking into account the widget’s preference for height-for-width management. More...

 
void set_layout_manager (const Glib::RefPtr< LayoutManager >& layout_manager)
 Sets the layout manager delegate instance that provides an implementation for measuring and allocating the children of widget. More...

 
void unset_layout_manager ()
 Undoes the effect of a previous call to set_layout_manager(). More...

 
Glib::RefPtr< LayoutManager > get_layout_manager ()
 Retrieves the layout manager set using set_layout_manager(). More...

 
Glib::RefPtr< const LayoutManager > get_layout_manager () const
 Retrieves the layout manager set using set_layout_manager(). More...

 
bool mnemonic_activate (bool group_cycling)
 Emits the Gtk::Widget::signal_mnemonic_activate() signal. More...

 
bool activate ()
 For widgets that can be “activated” (buttons, menu items, etc.) this function activates them. More...

 
void set_can_focus (bool can_focus=true)
 Specifies whether the input focus can enter the widget or any of its children. More...

 
bool get_can_focus () const
 Determines whether the input focus can enter widget or any of its children. More...

 
void set_focusable (bool focusable=true)
 Specifies whether widget can own the input focus. More...

 
bool get_focusable () const
 Determines whether widget can own the input focus. More...

 
bool has_focus () const
 Determines if the widget has the global input focus. More...

 
bool is_focus () const
 Determines if the widget is the focus widget within its toplevel. More...

 
bool has_visible_focus () const
 Determines if the widget should show a visible indication that it has the global input focus. More...

 
bool grab_focus ()
 Causes widget (or one of its descendents) to have the keyboard focus for the Gtk::Window it's inside. More...

 
void set_focus_on_click (bool focus_on_click=true)
 Sets whether the widget should grab focus when it is clicked with the mouse. More...

 
bool get_focus_on_click () const
 Returns whether the widget should grab focus when it is clicked with the mouse. More...

 
void set_can_target (bool can_target=true)
 Sets whether widget can be the target of pointer events. More...

 
bool get_can_target () const
 Queries whether widget can be the target of pointer events. More...

 
bool has_default () const
 Determines whether widget is the current default widget within its toplevel. More...

 
void set_receives_default (bool receives_default=true)
 Specifies whether widget will be treated as the default widget within its toplevel when it has the focus, even if another widget is the default. More...

 
bool get_receives_default () const
 Determines whether widget is always treated as the default widget within its toplevel when it has the focus, even if another widget is the default. More...

 
void set_name (const Glib::ustring& name)
 Widgets can be named, which allows you to refer to them from a CSS file. More...

 
void unset_name ()
 
Glib::ustring get_name () const
 Retrieves the name of a widget. More...

 
void set_state_flags (StateFlags flags, bool clear=true)
 This function is for use in widget implementations. More...

 
void unset_state_flags (StateFlags flags)
 This function is for use in widget implementations. More...

 
StateFlags get_state_flags () const
 Returns the widget state as a flag set. More...

 
void set_sensitive (bool sensitive=true)
 Sets the sensitivity of a widget. More...

 
bool get_sensitive () const
 Returns the widget’s sensitivity (in the sense of returning the value that has been set using set_sensitive()). More...

 
bool is_sensitive () const
 Returns the widget’s effective sensitivity, which means it is sensitive itself and also its parent widget is sensitive. More...

 
void set_visible (bool visible=true)
 Sets the visibility state of widget. More...

 
bool get_visible () const
 Determines whether the widget is visible. More...

 
bool is_visible () const
 Determines whether the widget and all its parents are marked as visible. More...

 
bool is_drawable () const
 Determines whether widget can be drawn to. More...

 
bool get_realized () const
 Determines whether widget is realized. More...

 
bool get_mapped () const
 Whether the widget is mapped. More...

 
void set_child_visible (bool visible=true)
 Sets whether widget should be mapped along with its when its parent is mapped and widget has been shown with show(). More...

 
bool get_child_visible () const
 Gets the value set with set_child_visible(). More...

 
int get_allocated_width () const
 Returns the width that has currently been allocated to widget. More...

 
int get_allocated_height () const
 Returns the height that has currently been allocated to widget. More...

 
int get_allocated_baseline () const
 Returns the baseline that has currently been allocated to widget. More...

 
Allocation get_allocation () const
 Retrieves the widget’s location. More...

 
int get_width () const
 Returns the content width of the widget, as passed to its size-allocate implementation. More...

 
int get_height () const
 Returns the content height of the widget, as passed to its size-allocate implementation. More...

 
int get_size (Orientation orientation) const
 Returns the content width or height of the widget, depending on orientation. More...

 
Widget* get_parent ()
 Returns the parent widget of widget. More...

 
const Widget* get_parent () const
 Returns the parent widget of widget. More...

 
Root* get_root ()
 Returns the Gtk::Root widget of widget or nullptr if the widget is not contained inside a widget tree with a root widget. More...

 
const Root* get_root () const
 Returns the Gtk::Root widget of widget or nullptr if the widget is not contained inside a widget tree with a root widget. More...

 
Native* get_native ()
 Returns the GtkNative widget that contains widget, or nullptr if the widget is not contained inside a widget tree with a native ancestor. More...

 
const Native* get_native () const
 Returns the GtkNative widget that contains widget, or nullptr if the widget is not contained inside a widget tree with a native ancestor. More...

 
bool child_focus (DirectionType direction)
 This function is used by custom widget implementations; if you're writing an app, you’d use grab_focus() to move the focus to a particular widget. More...

 
bool keynav_failed (DirectionType direction)
 This function should be called whenever keyboard navigation within a single widget hits a boundary. More...

 
void error_bell ()
 Notifies the user about an input-related error on this widget. More...

 
void set_size_request (int width=-1, int height=-1)
 Sets the minimum size of a widget; that is, the widget’s size request will be at least width by height. More...

 
void get_size_request (int& width, int& height) const
 Gets the size request that was explicitly set for the widget using set_size_request(). More...

 
void set_opacity (double opacity)
 Request the widget to be rendered partially transparent, with opacity 0 being fully transparent and 1 fully opaque. More...

 
double get_opacity () const
 Fetches the requested opacity for this widget. More...

 
void set_overflow (Overflow overflow)
 Sets how widget treats content that is drawn outside the widget's content area. More...

 
Overflow get_overflow () const
 Returns the value set via set_overflow(). More...

 
Widget* get_ancestor (GType widget_type)
 Gets the first ancestor of widget with type widget_type. More...

 
const Widget* get_ancestor (GType widget_type) const
 Gets the first ancestor of widget with type widget_type. More...

 
int get_scale_factor () const
 Retrieves the internal scale factor that maps from window coordinates to the actual device pixels. More...

 
Glib::RefPtr< Gdk::Display > get_display ()
 Get the Gdk::Display for the toplevel window associated with this widget. More...

 
Glib::RefPtr< const Gdk::Display > get_display () const
 Get the Gdk::Display for the toplevel window associated with this widget. More...

 
Glib::RefPtr< Settings > get_settings ()
 Gets the settings object holding the settings used for this widget. More...

 
Glib::RefPtr< Gdk::Clipboard > get_clipboard ()
 This is a utility function to get the clipboard object for the Gdk::Display that widget is using. More...

 
Glib::RefPtr< const Gdk::Clipboard > get_clipboard () const
 This is a utility function to get the clipboard object for the Gdk::Display that widget is using. More...

 
Glib::RefPtr< Gdk::Clipboard > get_primary_clipboard ()
 This is a utility function to get the primary clipboard object for the Gdk::Display that widget is using. More...

 
Glib::RefPtr< const Gdk::Clipboard > get_primary_clipboard () const
 This is a utility function to get the primary clipboard object for the Gdk::Display that widget is using. More...

 
bool get_hexpand () const
 Gets whether the widget would like any available extra horizontal space. More...

 
void set_hexpand (bool expand=true)
 Sets whether the widget would like any available extra horizontal space. More...

 
bool get_hexpand_set () const
 Gets whether set_hexpand() has been used to explicitly set the expand flag on this widget. More...

 
void set_hexpand_set (bool set=true)
 Sets whether the hexpand flag (see get_hexpand()) will be used. More...

 
bool get_vexpand () const
 Gets whether the widget would like any available extra vertical space. More...

 
void set_vexpand (bool expand=true)
 Sets whether the widget would like any available extra vertical space. More...

 
bool get_vexpand_set () const
 Gets whether set_vexpand() has been used to explicitly set the expand flag on this widget. More...

 
void set_vexpand_set (bool set=true)
 Sets whether the vexpand flag (see get_vexpand()) will be used. More...

 
bool compute_expand (Orientation orientation)
 Computes whether a container should give this widget extra space when possible. More...

 
void set_expand (bool expand=true)
 Sets whether the widget would like any available extra space in both directions. More...

 
Align get_halign () const
 Gets the value of the Gtk::Widget::property_halign() property. More...

 
void set_halign (Align align)
 Sets the horizontal alignment of widget. More...

 
Align get_valign () const
 Gets the value of the Gtk::Widget::property_valign() property. More...

 
void set_valign (Align align)
 Sets the vertical alignment of widget. More...

 
int get_margin_start () const
 Gets the value of the Gtk::Widget::property_margin_start() property. More...

 
void set_margin_start (int margin)
 Sets the start margin of widget. More...

 
int get_margin_end () const
 Gets the value of the Gtk::Widget::property_margin_end() property. More...

 
void set_margin_end (int margin)
 Sets the end margin of widget. More...

 
int get_margin_top () const
 Gets the value of the Gtk::Widget::property_margin_top() property. More...

 
void set_margin_top (int margin)
 Sets the top margin of widget. More...

 
int get_margin_bottom () const
 Gets the value of the Gtk::Widget::property_margin_bottom() property. More...

 
void set_margin_bottom (int margin)
 Sets the bottom margin of widget. More...

 
void set_margin (int margin)
 Set all 4 margins to the same value. More...

 
bool is_ancestor (Widget& ancestor) const
 Determines whether widget is somewhere inside ancestor, possibly with intermediate containers. More...

 
bool translate_coordinates (Widget& dest_widget, double src_x, double src_y, double& dest_x, double& dest_y)
 Translate coordinates relative to src_widget’s allocation to coordinates relative to dest_widget’s allocations. More...

 
bool contains (double x, double y) const
 Tests if the point at ( x, y) is contained in widget. More...

 
Widget* pick (double x, double y, PickFlags flags=PickFlags::DEFAULT)
 Finds the descendant of widget (including widget itself) closest to the screen at the point ( x, y). More...

 
const Widget* pick (double x, double y, PickFlags flags=PickFlags::DEFAULT) const
 Finds the descendant of widget (including widget itself) closest to the screen at the point ( x, y). More...

 
void add_controller (const Glib::RefPtr< EventController >& controller)
 Adds controller to widget so that it will receive events. More...

 
void remove_controller (const Glib::RefPtr< EventController >& controller)
 Removes controller from widget, so that it doesn't process events anymore. More...

 
Glib::RefPtr< Pango::Context > create_pango_context ()
 Creates a new Pango::Context with the appropriate font map, font options, font description, and base direction for drawing text for this widget. More...

 
Glib::RefPtr< Pango::Context > get_pango_context ()
 Gets a Pango::Context with the appropriate font map, font description, and base direction for this widget. More...

 
void set_font_options (const Cairo::FontOptions& options)
 Sets the #cairo_font_options_t used for Pango rendering in this widget. More...

 
void unset_font_options ()
 Undoes the effect of previous calls to set_font_options(). More...

 
Cairo::FontOptions get_font_options () const
 Returns the #cairo_font_options_t used for Pango rendering. More...

 
Glib::RefPtr< Pango::Layout > create_pango_layout (const Glib::ustring& text)
 Creates a new Pango::Layout with the appropriate font map, font description, and base direction for drawing text for this widget. More...

 
void set_direction (TextDirection dir)
 Sets the reading direction on a particular widget. More...

 
TextDirection get_direction () const
 Gets the reading direction for a particular widget. More...

 
void set_cursor (const Glib::RefPtr< Gdk::Cursor >& cursor)
 Sets the cursor to be shown when pointer devices point towards widget. More...

 
void set_cursor (const Glib::ustring& name={})
 Sets a named cursor to be shown when pointer devices point towards the widget. More...

 
Glib::RefPtr< Gdk::Cursor > get_cursor ()
 Queries the cursor set via set_cursor(). More...

 
Glib::RefPtr< const Gdk::Cursor > get_cursor () const
 Queries the cursor set via set_cursor(). More...

 
std::vector< Widget* > list_mnemonic_labels ()
 Returns a newly allocated list of the widgets, normally labels, for which this widget is the target of a mnemonic (see for example, Gtk::Label::set_mnemonic_widget()). More...

 
std::vector< const Widget* > list_mnemonic_labels () const
 Returns a newly allocated list of the widgets, normally labels, for which this widget is the target of a mnemonic (see for example, Gtk::Label::set_mnemonic_widget()). More...

 
void add_mnemonic_label (Widget& label)
 Adds a widget to the list of mnemonic labels for this widget. More...

 
void remove_mnemonic_label (Widget& label)
 Removes a widget from the list of mnemonic labels for this widget. More...

 
bool drag_check_threshold (int start_x, int start_y, int current_x, int current_y)
 Checks to see if a mouse drag starting at ( start_x, start_y) and ending at ( current_x, current_y) has passed the GTK drag threshold, and thus should trigger the beginning of a drag-and-drop operation. More...

 
Glib::RefPtr< Gdk::FrameClock > get_frame_clock ()
 Obtains the frame clock for a widget. More...

 
Glib::RefPtr< const Gdk::FrameClock > get_frame_clock () const
 Obtains the frame clock for a widget. More...

 
void set_parent (Widget& parent)
 This function is useful only when implementing subclasses of Gtk::Widget. More...

 
void unparent ()
 This function is only for use in widget implementations. More...

 
void map ()
 This function is only for use in widget implementations. More...

 
void unmap ()
 This function is only for use in widget implementations. More...

 
void trigger_tooltip_query ()
 Triggers a tooltip query on the display where the toplevel of widget is located. More...

 
void set_tooltip_text (const Glib::ustring& text)
 Sets text as the contents of the tooltip. More...

 
Glib::ustring get_tooltip_text () const
 Gets the contents of the tooltip for widget. More...

 
void set_tooltip_markup (const Glib::ustring& markup)
 Sets markup as the contents of the tooltip, which is marked up with the Pango text markup language. More...

 
Glib::ustring get_tooltip_markup () const
 Gets the contents of the tooltip for widget set using set_tooltip_markup(). More...

 
void set_has_tooltip (bool has_tooltip=TRUE)
 Sets the has-tooltip property on widget to has_tooltip. More...

 
bool get_has_tooltip () const
 Returns the current value of the has-tooltip property. More...

 
bool in_destruction () const
 Returns whether the widget is currently being destroyed. More...

 
Glib::RefPtr< StyleContext > get_style_context ()
 Returns the style context associated to widget. More...

 
Glib::RefPtr< const StyleContext > get_style_context () const
 Returns the style context associated to widget. More...

 
guint add_tick_callback (const SlotTick& slot)
 Queues an animation frame update and adds a callback to be called before each frame. More...

 
void remove_tick_callback (guint id)
 Removes a tick callback previously registered with add_tick_callback(). More...

 
void insert_action_group (const Glib::ustring& name, const Glib::RefPtr< Gio::ActionGroup >& group)
 Inserts group into widget. More...

 
void remove_action_group (const Glib::ustring& name)
 Removes a group from the widget. More...

 
bool activate_action (const Glib::ustring& name, const Glib::VariantBase& args={})
 Looks up the action in the action groups associated with the widget and its ancestors, and activates it. More...

 
void activate_default ()
 Activate the default.activate action from widget. More...

 
void set_font_map (const Glib::RefPtr< Pango::FontMap >& font_map)
 Sets the font map to use for Pango rendering. More...

 
Glib::RefPtr< Pango::FontMap > get_font_map ()
 Gets the font map that has been set with set_font_map(). More...

 
Glib::RefPtr< const Pango::FontMap > get_font_map () const
 Gets the font map that has been set with set_font_map(). More...

 
Widget* get_first_child ()
 Returns the widgets first child. More...

 
const Widget* get_first_child () const
 Returns the widgets first child. More...

 
Widget* get_last_child ()
 Returns the widgets last child. More...

 
const Widget* get_last_child () const
 Returns the widgets last child. More...

 
Widget* get_next_sibling ()
 Returns the widgets next sibling. More...

 
const Widget* get_next_sibling () const
 Returns the widgets next sibling. More...

 
Widget* get_prev_sibling ()
 Returns the widgets previous sibling. More...

 
const Widget* get_prev_sibling () const
 Returns the widgets previous sibling. More...

 
Glib::RefPtr< Gio::ListModel > observe_children ()
 Returns a ListModel to track the children of widget. More...

 
Glib::RefPtr< const Gio::ListModel > observe_children () const
 Returns a ListModel to track the children of widget. More...

 
Glib::RefPtr< Gio::ListModel > observe_controllers ()
 Returns a ListModel to track the Gtk::EventControllers of widget. More...

 
Glib::RefPtr< const Gio::ListModel > observe_controllers () const
 Returns a ListModel to track the Gtk::EventControllers of widget. More...

 
void insert_after (Widget& parent, const Widget& previous_sibling)
 Inserts the Widget into the child widget list of parent after previous_sibling. More...

 
void insert_before (Widget& parent, const Widget& next_sibling)
 Inserts the Widget into the child widget list of parent before next_sibling. More...

 
void insert_at_start (Widget& parent)
 Inserts the Widget at the beginning of the child widget list of parent. More...

 
void insert_at_end (Widget& parent)
 Inserts the Widget at the end of the child widget list of parent. More...

 
void snapshot_child (Widget& child, const Glib::RefPtr< Gtk::Snapshot >& snapshot)
 When a widget receives a call to the snapshot function, it must send synthetic Gtk::WidgetClass.snapshot() calls to all children. More...

 
bool should_layout () const
 Returns whether widget should contribute to the measuring and allocation of its parent. More...

 
Glib::ustring get_css_name () const
 Returns the CSS name that is used for self. More...

 
void add_css_class (const Glib::ustring& css_class)
 Adds css_class to widget. More...

 
void remove_css_class (const Glib::ustring& css_class)
 Removes css_class from widget. More...

 
bool has_css_class (const Glib::ustring& css_class) const
 Returns whether css_class is currently applied to widget. More...

 
std::vector< Glib::ustring > get_css_classes () const
 Returns the list of css classes applied to widget. More...

 
void set_css_classes (const std::vector< Glib::ustring >& classes)
 Will clear all css classes applied to widget and replace them with classes. More...

 
Glib::SignalProxy< void()> signal_show ()
 
Glib::SignalProxy< void()> signal_hide ()
 
Glib::SignalProxy< void()> signal_map ()
 Emitted on mapping of a widget to the screen. More...

 
Glib::SignalProxy< void()> signal_unmap ()
 
Glib::SignalProxy< void()> signal_realize ()
 Emitted on realization of a widget. More...

 
Glib::SignalProxy< void()> signal_unrealize ()
 
Glib::SignalProxy< void(Gtk::StateFlags)> signal_state_flags_changed ()
 
Glib::SignalProxy< void(TextDirection)> signal_direction_changed ()
 
Glib::SignalProxy< bool(bool)> signal_mnemonic_activate ()
 
Glib::SignalProxy< bool(int, int, bool, const Glib::RefPtr< Tooltip >&)> signal_query_tooltip ()
 
Glib::PropertyProxy< Glib::ustring > property_name ()
 The name of the widget. More...

 
Glib::PropertyProxy_ReadOnly< Glib::ustring > property_name () const
 The name of the widget. More...

 
Glib::PropertyProxy_ReadOnly< Widget* > property_parent () const
 The parent widget of this widget. More...

 
Glib::PropertyProxy_ReadOnly< Root* > property_root () const
 The Gtk::Root widget of the widget tree containing this widget or nullptr if the widget is not contained in a root widget. More...

 
Glib::PropertyProxy< int > property_width_request ()
 Override for width request of the widget, or -1 if natural request should be used. More...

 
Glib::PropertyProxy_ReadOnly< int > property_width_request () const
 Override for width request of the widget, or -1 if natural request should be used. More...

 
Glib::PropertyProxy< int > property_height_request ()
 Override for height request of the widget, or -1 if natural request should be used. More...

 
Glib::PropertyProxy_ReadOnly< int > property_height_request () const
 Override for height request of the widget, or -1 if natural request should be used. More...

 
Glib::PropertyProxy< bool > property_visible ()
 Whether the widget is visible. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_visible () const
 Whether the widget is visible. More...

 
Glib::PropertyProxy< bool > property_sensitive ()
 Whether the widget responds to input. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_sensitive () const
 Whether the widget responds to input. More...

 
Glib::PropertyProxy< bool > property_can_focus ()
 Whether the widget or any of its descendents can accept the input focus. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_can_focus () const
 Whether the widget or any of its descendents can accept the input focus. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_has_focus () const
 Whether the widget has the input focus. More...

 
Glib::PropertyProxy< bool > property_can_target ()
 Whether the widget can receive pointer events. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_can_target () const
 Whether the widget can receive pointer events. More...

 
Glib::PropertyProxy< bool > property_focus_on_click ()
 Whether the widget should grab focus when it is clicked with the mouse. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_focus_on_click () const
 Whether the widget should grab focus when it is clicked with the mouse. More...

 
Glib::PropertyProxy< bool > property_focusable ()
 Whether this widget itself will accept the input focus. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_focusable () const
 Whether this widget itself will accept the input focus. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_has_default () const
 Whether the widget is the default widget. More...

 
Glib::PropertyProxy< bool > property_receives_default ()
 If true, the widget will receive the default action when it is focused. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_receives_default () const
 If true, the widget will receive the default action when it is focused. More...

 
Glib::PropertyProxy< Glib::RefPtr< Gdk::Cursor > > property_cursor ()
 The cursor used by widget. More...

 
Glib::PropertyProxy_ReadOnly< Glib::RefPtr< Gdk::Cursor > > property_cursor () const
 The cursor used by widget. More...

 
Glib::PropertyProxy< bool > property_has_tooltip ()
 Enables or disables the emission of Gtk::Widget::signal_query_tooltip() on widget. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_has_tooltip () const
 Enables or disables the emission of Gtk::Widget::signal_query_tooltip() on widget. More...

 
Glib::PropertyProxy< Glib::ustring > property_tooltip_markup ()
 Sets the text of tooltip to be the given string, which is marked up with the [Pango text markup language][PangoMarkupFormat]. More...

 
Glib::PropertyProxy_ReadOnly< Glib::ustring > property_tooltip_markup () const
 Sets the text of tooltip to be the given string, which is marked up with the [Pango text markup language][PangoMarkupFormat]. More...

 
Glib::PropertyProxy< Glib::ustring > property_tooltip_text ()
 Sets the text of tooltip to be the given string. More...

 
Glib::PropertyProxy_ReadOnly< Glib::ustring > property_tooltip_text () const
 Sets the text of tooltip to be the given string. More...

 
Glib::PropertyProxy< Align > property_halign ()
 How to distribute horizontal space if widget gets extra space, see Gtk::Align. More...

 
Glib::PropertyProxy_ReadOnly< Align > property_halign () const
 How to distribute horizontal space if widget gets extra space, see Gtk::Align. More...

 
Glib::PropertyProxy< Align > property_valign ()
 How to distribute vertical space if widget gets extra space, see Gtk::Align. More...

 
Glib::PropertyProxy_ReadOnly< Align > property_valign () const
 How to distribute vertical space if widget gets extra space, see Gtk::Align. More...

 
Glib::PropertyProxy< int > property_margin_start ()
 Margin on start of widget, horizontally. More...

 
Glib::PropertyProxy_ReadOnly< int > property_margin_start () const
 Margin on start of widget, horizontally. More...

 
Glib::PropertyProxy< int > property_margin_end ()
 Margin on end of widget, horizontally. More...

 
Glib::PropertyProxy_ReadOnly< int > property_margin_end () const
 Margin on end of widget, horizontally. More...

 
Glib::PropertyProxy< int > property_margin_top ()
 Margin on top side of widget. More...

 
Glib::PropertyProxy_ReadOnly< int > property_margin_top () const
 Margin on top side of widget. More...

 
Glib::PropertyProxy< int > property_margin_bottom ()
 Margin on bottom side of widget. More...

 
Glib::PropertyProxy_ReadOnly< int > property_margin_bottom () const
 Margin on bottom side of widget. More...

 
Glib::PropertyProxy< bool > property_hexpand ()
 Whether to expand horizontally. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_hexpand () const
 Whether to expand horizontally. More...

 
Glib::PropertyProxy< bool > property_hexpand_set ()
 Whether to use the Gtk::Widget::property_hexpand() property. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_hexpand_set () const
 Whether to use the Gtk::Widget::property_hexpand() property. More...

 
Glib::PropertyProxy< bool > property_vexpand ()
 Whether to expand vertically. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_vexpand () const
 Whether to expand vertically. More...

 
Glib::PropertyProxy< bool > property_vexpand_set ()
 Whether to use the Gtk::Widget::property_vexpand() property. More...

 
Glib::PropertyProxy_ReadOnly< bool > property_vexpand_set () const
 Whether to use the Gtk::Widget::property_vexpand() property. More...

 
Glib::PropertyProxy< double > property_opacity ()
 The requested opacity of the widget. More...

 
Glib::PropertyProxy_ReadOnly< double > property_opacity () const
 The requested opacity of the widget. More...

 
Glib::PropertyProxy< Overflow > property_overflow ()
 How content outside the widget's content area is treated. More...

 
Glib::PropertyProxy_ReadOnly< Overflow > property_overflow () const
 How content outside the widget's content area is treated. More...

 
Glib::PropertyProxy_ReadOnly< int > property_scale_factor () const
 The scale factor of the widget. More...

 
Glib::PropertyProxy_ReadOnly< Glib::ustring > property_css_name () const
 The name of this widget in the CSS tree. More...

 
Glib::PropertyProxy< std::vector< Glib::ustring > > property_css_classes ()
 A list of css classes applied to this widget. More...

 
Glib::PropertyProxy_ReadOnly< std::vector< Glib::ustring > > property_css_classes () const
 A list of css classes applied to this widget. More...

 
Glib::PropertyProxy< Glib::RefPtr< LayoutManager > > property_layout_manager ()
 The Gtk::LayoutManager instance to use to compute the preferred size of the widget, and allocate its children. More...

 
Glib::PropertyProxy_ReadOnly< Glib::RefPtr< LayoutManager > > property_layout_manager () const
 The Gtk::LayoutManager instance to use to compute the preferred size of the widget, and allocate its children. More...

 
- Public Member Functions inherited from Gtk::Object
 Object (Object&& src) noexcept
 
Object& operator= (Object&& src) noexcept
 
 ~Object () noexcept override
 
- 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 Gtk::Accessible
 Accessible (Accessible&& src) noexcept
 
Accessible& operator= (Accessible&& src) noexcept
 
 ~Accessible () noexcept override
 
GtkAccessible* gobj ()
 Provides access to the underlying C GObject. More...

 
const GtkAccessible* gobj () const
 Provides access to the underlying C GObject. More...

 
Role get_accessible_role () const
 Retrieves the Gtk::Accessible::Role for the given Gtk::Accessible. More...

 
void update_state (State state, const Glib::ValueBase& value)
 Updates an accessible state. More...

 
void update_property (Property property, const Glib::ValueBase& value)
 Updates an accessible property. More...

 
void update_relation (Relation relation, const Glib::ValueBase& value)
 Updates an accessible relation. More...

 
void reset_state (State state)
 Resets the accessible state to its default value. More...

 
void reset_property (Property property)
 Resets the accessible property to its default value. More...

 
void reset_relation (Relation relation)
 Resets the accessible relation to its default value. More...

 
Glib::PropertyProxy< Role > property_accessible_role ()
 The accessible role of the given Gtk::Accessible implementation. More...

 
Glib::PropertyProxy_ReadOnly< Role > property_accessible_role () const
 The accessible role of the given Gtk::Accessible implementation. More...

 
- 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
 
- Public Member Functions inherited from Gtk::Buildable
 Buildable (Buildable&& src) noexcept
 
Buildable& operator= (Buildable&& src) noexcept
 
 ~Buildable () noexcept override
 
GtkBuildable* gobj ()
 Provides access to the underlying C GObject. More...

 
const GtkBuildable* gobj () const
 Provides access to the underlying C GObject. More...

 
Glib::ustring get_buildable_id () const
 Gets the ID of the buildable object. More...

 
- Public Member Functions inherited from Gtk::ConstraintTarget
 ConstraintTarget (ConstraintTarget&& src) noexcept
 
ConstraintTarget& operator= (ConstraintTarget&& src) noexcept
 
 ~ConstraintTarget () noexcept override
 
GtkConstraintTarget* gobj ()
 Provides access to the underlying C GObject. More...

 
const GtkConstraintTarget* gobj () const
 Provides access to the underlying C GObject. More...

 

Static Public Member Functions

static GType get_type ()
 Get the GType for this class, for use with the underlying GObject type system. More...

 
- Static Public Member Functions inherited from Gtk::Widget
static GType get_type ()
 Get the GType for this class, for use with the underlying GObject type system. More...

 
static void set_default_direction (TextDirection dir)
 Sets the default reading direction for widgets where the direction has not been explicitly set by set_direction(). More...

 
static TextDirection get_default_direction ()
 Obtains the current default reading direction. More...

 
- Static Public Member Functions inherited from Gtk::Accessible
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...

 
- Static Public Member Functions inherited from Gtk::Buildable
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...

 
- Static Public Member Functions inherited from Gtk::ConstraintTarget
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

virtual void on_resize (int width, int height)
 This is a default handler for the signal signal_resize(). More...

 
- Protected Member Functions inherited from Gtk::Widget
virtual void root_vfunc ()
 
virtual void unroot_vfunc ()
 
virtual void size_allocate_vfunc (int width, int height, int baseline)
 
virtual SizeRequestMode get_request_mode_vfunc () const
 
virtual void measure_vfunc (Orientation orientation, int for_size, int& minimum, int& natural, int& minimum_baseline, int& natural_baseline) const
 
virtual bool grab_focus_vfunc ()
 
virtual void set_focus_child_vfunc (Widget* child)
 Sets the focused child of widget. More...

 
virtual void compute_expand_vfunc (bool& hexpand_p, bool& vexpand_p)
 
virtual bool contains_vfunc (double x, double y) const
 
virtual void snapshot_vfunc (const Glib::RefPtr< Gtk::Snapshot >& snapshot)
 
 Widget ()
 
void realize ()
 Creates the GDK (windowing system) resources associated with a widget. More...

 
void unrealize ()
 This function is only useful in widget implementations. More...

 
void realize_if_needed ()
 
void set_focus_child (Widget& child)
 Set child as the current focus child of widget. More...

 
void unset_focus_child ()
 Unsets the focus child of the widget. More...

 
Widget* get_focus_child ()
 Returns the current focus child of widget. More...

 
const Widget* get_focus_child () const
 Returns the current focus child of widget. More...

 
virtual void on_show ()
 This is a default handler for the signal signal_show(). More...

 
virtual void on_hide ()
 This is a default handler for the signal signal_hide(). More...

 
virtual void on_map ()
 This is a default handler for the signal signal_map(). More...

 
virtual void on_unmap ()
 This is a default handler for the signal signal_unmap(). More...

 
virtual void on_realize ()
 This is a default handler for the signal signal_realize(). More...

 
virtual void on_unrealize ()
 This is a default handler for the signal signal_unrealize(). More...

 
virtual void on_state_flags_changed (Gtk::StateFlags previous_state_flags)
 This is a default handler for the signal signal_state_flags_changed(). More...

 
virtual void on_direction_changed (TextDirection direction)
 This is a default handler for the signal signal_direction_changed(). More...

 
virtual bool on_mnemonic_activate (bool group_cycling)
 This is a default handler for the signal signal_mnemonic_activate(). More...

 
virtual bool on_query_tooltip (int x, int y, bool keyboard_tooltip, const Glib::RefPtr< Tooltip >& tooltip)
 This is a default handler for the signal signal_query_tooltip(). More...

 
- 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 Gtk::Accessible
 Accessible ()
 You should derive from this class to use it. More...

 
- Protected Member Functions inherited from Gtk::Buildable
 Buildable ()
 You should derive from this class to use it. More...

 
- Protected Member Functions inherited from Gtk::ConstraintTarget
 ConstraintTarget ()
 You should derive from this class to use it. More...

 

Related Functions

(Note that these are not member functions.)

Gtk::DrawingArea* wrap (GtkDrawingArea* object, bool take_copy=false)
 A Glib::wrap() method for this object. More...

 
- Related Functions inherited from Gtk::Widget
Gtk::Widget* wrap (GtkWidget* object, bool take_copy=false)
 A Glib::wrap() method for this object. More...

 
- Related Functions inherited from Gtk::Accessible
Glib::RefPtr< Gtk::Accessible > wrap (GtkAccessible* object, bool take_copy=false)
 A Glib::wrap() method for this object. More...

 
- Related Functions inherited from Gtk::Buildable
Glib::RefPtr< Gtk::Buildable > wrap (GtkBuildable* object, bool take_copy=false)
 A Glib::wrap() method for this object. More...

 
- Related Functions inherited from Gtk::ConstraintTarget
Glib::RefPtr< Gtk::ConstraintTarget > wrap (GtkConstraintTarget* object, bool take_copy=false)
 A Glib::wrap() method for this object. More...

 

Detailed Description

A widget for custom user interface elements.

The DrawingArea widget is used for creating custom user interface elements. It’s essentially a blank widget; you can draw on it. After creating a drawing area, the application may want to connect to:

  • Mouse and button press signals to respond to input from the user. (Use Gtk::Widget::add_events() to enable events you wish to receive.)
  • Gtk::Widget::signal_realize() to take any necessary actions when the widget is instantiated on a particular display. (Create GDK resources in response to this signal.)
  • Gtk::Widget::signal_size_allocate() to take any necessary actions when the widget changes size.
  • Call set_draw_func() to handle redrawing the contents of the widget.

The following code portion demonstrates using a drawing area to display a circle in the normal widget foreground color.

Note that GDK automatically clears the exposed area before causing a redraw, and that drawing is implicitly clipped to the exposed area. If you want to have a theme-provided background, you need to call Gtk::StyleContext::render_background() in your draw function.

Simple DrawingArea usage:

class MyDrawingArea : public Gtk::DrawingArea
{
public:
MyDrawingArea()
{
set_draw_func(sigc::mem_fun(*this,& MyDrawingArea::on_draw));
}
void on_draw(const Cairo::RefPtr<Cairo::Context>& cr, int width, int height)
{
auto style_context = get_style_context();
style_context->render_background(cr, 0, 0, width, height);
cr->arc(width / 2.0, height / 2.0, std::min(width, height) / 2.0, 0, 2* M_PI);
auto color = style_context->get_color();
Gdk::Cairo::set_source_rgba(cr, color);
cr->fill();
}
//...
}; // end MyDrawingArea
//...
auto area = Gtk::manage(new MyDrawingArea)
area->set_content_width(100);
area->set_content_height(100);

The draw function is normally called when a drawing area first comes onscreen, or when it’s covered by another window and then uncovered. You can also force a redraw by adding to the “damage region” of the drawing area’s window using Gtk::Widget::queue_draw_region(), Gtk::Widget::queue_draw_area() or Gtk::Widget::queue_draw(). This will cause the drawing area to call the draw function again.

To receive mouse events on a drawing area, you will need to use event controllers. To receive keyboard events, you will need to set the “can-focus” property on the drawing area, and you should probably draw some user-visible indication that the drawing is focused.

Member Typedef Documentation

using Gtk::DrawingArea::SlotDraw = sigc::slot<void(const Cairo::RefPtr<Cairo::Context>&, int, int)>

Whenever the drawing area needs to redraw, this slot will be called.

For instance:

void on_draw(const Cairo::RefPtr<Cairo::Context>& cr, int width, int height);

This slot should exclusively redraw the contents of the drawing area and must not call any widget functions that cause changes.

Parameters
crThe context to draw to.
widthThe actual width of the contents. This value will be at least as wide as property_content_width().
heightThe actual height of the contents. This value will be at least as high as property_content_height().
Since gtkmm 3.90:

Constructor & Destructor Documentation

Gtk::DrawingArea::DrawingArea ( DrawingArea&&  src)
noexcept
Gtk::DrawingArea::DrawingArea ( const DrawingArea&  )
delete
Gtk::DrawingArea::~DrawingArea ( )
overridenoexcept
Gtk::DrawingArea::DrawingArea ( )

Member Function Documentation

int Gtk::DrawingArea::get_content_height ( ) const

Retrieves the value previously set via set_content_height().

Returns
The height requested for content of the drawing area.
int Gtk::DrawingArea::get_content_width ( ) const

Retrieves the value previously set via set_content_width().

Returns
The width requested for content of the drawing area.
static GType Gtk::DrawingArea::get_type ( )
static

Get the GType for this class, for use with the underlying GObject type system.

GtkDrawingArea* Gtk::DrawingArea::gobj ( )
inline

Provides access to the underlying C GObject.

const GtkDrawingArea* Gtk::DrawingArea::gobj ( ) const
inline

Provides access to the underlying C GObject.

virtual void Gtk::DrawingArea::on_resize ( int  width,
int  height 
)
protectedvirtual

This is a default handler for the signal signal_resize().

DrawingArea& Gtk::DrawingArea::operator= ( DrawingArea&&  src)
noexcept
DrawingArea& Gtk::DrawingArea::operator= ( const DrawingArea&  )
delete
Glib::PropertyProxy< int > Gtk::DrawingArea::property_content_height ( )

The content height.

See Gtk::DrawingArea::set_content_height() for details.

Default value: 0

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< int > Gtk::DrawingArea::property_content_height ( ) const

The content height.

See Gtk::DrawingArea::set_content_height() for details.

Default value: 0

Returns
A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.
Glib::PropertyProxy< int > Gtk::DrawingArea::property_content_width ( )

The content width.

See Gtk::DrawingArea::set_content_width() for details.

Default value: 0

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< int > Gtk::DrawingArea::property_content_width ( ) const

The content width.

See Gtk::DrawingArea::set_content_width() for details.

Default value: 0

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::DrawingArea::set_content_height ( int  width)

Sets the desired height of the contents of the drawing area.

Note that because widgets may be allocated larger sizes than they requested, it is possible that the actual height passed to your draw function is larger than the height set here. You can use Gtk::Widget::set_valign() to avoid that.

If the height is set to 0 (the default), the drawing area may disappear.

Parameters
widthThe height of contents.
void Gtk::DrawingArea::set_content_width ( int  width)

Sets the desired width of the contents of the drawing area.

Note that because widgets may be allocated larger sizes than they requested, it is possible that the actual width passed to your draw function is larger than the width set here. You can use Gtk::Widget::set_halign() to avoid that.

If the width is set to 0 (the default), the drawing area may disappear.

Parameters
widthThe width of contents.
void Gtk::DrawingArea::set_draw_func ( const SlotDraw&  slot)

Sets a draw function.

Setting a draw function is the main thing you want to do when using a drawing area. It is called whenever GTK needs to draw the contents of the drawing area to the screen.

The draw function will be called during the drawing stage of GTK. In the drawing stage it is not allowed to change properties of any GTK widgets or call any functions that would cause any properties to be changed. You should restrict yourself exclusively to drawing your contents in the draw function.

If what you are drawing does change, call Gtk::Widget::queue_draw() on the drawing area. This will call a redraw and will call slot again.

Since gtkmm 3.90:
Parameters
slotCallback that lets you draw the drawing area's contents.
Glib::SignalProxy<void(int, int)> Gtk::DrawingArea::signal_resize ( )
Slot Prototype:
void on_my_resize(int width, int height)

Flags: Run Last

The signal_resize() signal is emitted once when the widget is realized, and then each time the widget is changed while realized. This is useful in order to keep state up to date with the widget size, like for instance a backing surface.

Parameters
widthThe width of the viewport.
heightThe height of the viewport.

Friends And Related Function Documentation

Gtk::DrawingArea* wrap ( GtkDrawingArea *  object,
bool  take_copy = false 
)
related

A Glib::wrap() method for this object.

Parameters
objectThe C instance.
take_copyFalse 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.