gtkmm 4.19.0
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A widget displaying a Gdk::Paintable. More...
#include <gtkmm/picture.h>
Public Member Functions | |
Picture (Picture &&src) noexcept | |
Picture & | operator= (Picture &&src) noexcept |
Picture (const Picture &)=delete | |
Picture & | operator= (const Picture &)=delete |
~Picture () noexcept override | |
GtkPicture * | gobj () |
Provides access to the underlying C GObject. | |
const GtkPicture * | gobj () const |
Provides access to the underlying C GObject. | |
Picture () | |
Picture (const Glib::RefPtr< Gdk::Paintable > &paintable) | |
Creates a new Picture displaying paintable. | |
Picture (const Glib::RefPtr< Gdk::Pixbuf > &pixbuf) | |
Creates a new Picture widget displaying pixbuf. | |
Picture (const Glib::RefPtr< Gio::File > & file) | |
Creates a new Picture displaying the given file. | |
Picture (const std::string &filename) | |
Creates a new Picture displaying the file filename. | |
void | set_paintable (const Glib::RefPtr< Gdk::Paintable > &paintable) |
Makes self display the given paintable. | |
Glib::RefPtr< Gdk::Paintable > | get_paintable () |
Gets the Gdk::Paintable being displayed by the Gtk::Picture . | |
Glib::RefPtr< const Gdk::Paintable > | get_paintable () const |
Gets the Gdk::Paintable being displayed by the Gtk::Picture . | |
void | set_file (const Glib::RefPtr< const Gio::File > & file) |
Makes self load and display file. | |
Glib::RefPtr< Gio::File > | get_file () |
Gets the Gio::File currently displayed if self is displaying a file. | |
Glib::RefPtr< const Gio::File > | get_file () const |
Gets the Gio::File currently displayed if self is displaying a file. | |
void | set_filename (const std::string &filename) |
Makes self load and display the given filename. | |
void | set_resource (const std::string &resource_path) |
Makes self load and display the resource at the given resource_path. | |
void | set_pixbuf (const Glib::RefPtr< Gdk::Pixbuf > &pixbuf) |
Sets a Gtk::Picture to show a Gdk::Pixbuf . | |
void | set_keep_aspect_ratio (bool keep_aspect_ratio=true) |
If set to true , the self will render its contents according to their aspect ratio. | |
bool | get_keep_aspect_ratio () const |
Returns whether the Gtk::Picture preserves its contents aspect ratio. | |
void | set_can_shrink (bool can_shrink=true) |
If set to true , the self can be made smaller than its contents. | |
bool | get_can_shrink () const |
Returns whether the Gtk::Picture respects its contents size. | |
void | set_content_fit (ContentFit content_fit) |
Sets how the content should be resized to fit the Gtk::Picture . | |
ContentFit | get_content_fit () const |
Returns the fit mode for the content of the Gtk::Picture . | |
void | set_alternative_text (const Glib::ustring &alternative_text) |
Sets an alternative textual description for the picture contents. | |
Glib::ustring | get_alternative_text () const |
Gets the alternative textual description of the picture. | |
Glib::PropertyProxy< Glib::RefPtr< Gdk::Paintable > > | property_paintable () |
The Gdk::Paintable to be displayed by this Gtk::Picture . | |
Glib::PropertyProxy_ReadOnly< Glib::RefPtr< Gdk::Paintable > > | property_paintable () const |
The Gdk::Paintable to be displayed by this Gtk::Picture . | |
Glib::PropertyProxy< Glib::RefPtr< Gio::File > > | property_file () |
The Gio::File that is displayed or nullptr if none. | |
Glib::PropertyProxy_ReadOnly< Glib::RefPtr< Gio::File > > | property_file () const |
The Gio::File that is displayed or nullptr if none. | |
Glib::PropertyProxy< Glib::ustring > | property_alternative_text () |
The alternative textual description for the picture. | |
Glib::PropertyProxy_ReadOnly< Glib::ustring > | property_alternative_text () const |
The alternative textual description for the picture. | |
Glib::PropertyProxy< bool > | property_keep_aspect_ratio () |
Whether the GtkPicture will render its contents trying to preserve the aspect ratio. | |
Glib::PropertyProxy_ReadOnly< bool > | property_keep_aspect_ratio () const |
Whether the GtkPicture will render its contents trying to preserve the aspect ratio. | |
Glib::PropertyProxy< bool > | property_can_shrink () |
If the Gtk::Picture can be made smaller than the natural size of its contents. | |
Glib::PropertyProxy_ReadOnly< bool > | property_can_shrink () const |
If the Gtk::Picture can be made smaller than the natural size of its contents. | |
Glib::PropertyProxy< ContentFit > | property_content_fit () |
How the content should be resized to fit inside the Gtk::Picture . | |
Glib::PropertyProxy_ReadOnly< ContentFit > | property_content_fit () const |
How the content should be resized to fit inside the Gtk::Picture . | |
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Widget (Widget &&src) noexcept | |
Widget & | operator= (Widget &&src) noexcept |
Widget (const Widget &)=delete | |
Widget & | operator= (const Widget &)=delete |
~Widget () noexcept override | |
Destroys the widget. | |
GtkWidget * | gobj () |
Provides access to the underlying C GObject. | |
const GtkWidget * | gobj () const |
Provides access to the underlying C GObject. | |
Glib::RefPtr< ConstraintTarget > | make_refptr_constrainttarget () |
Converts this widget to a reference counted Gtk::ConstraintTarget. | |
Glib::RefPtr< const ConstraintTarget > | make_refptr_constrainttarget () const |
Converts this widget to a reference counted Gtk::ConstraintTarget. | |
void | show () |
Flags a widget to be displayed. | |
void | hide () |
Reverses the effects of [method.Gtk.Widget.show]. | |
void | queue_draw () |
Schedules this widget to be redrawn. | |
void | queue_resize () |
Flags a widget to have its size renegotiated. | |
void | queue_allocate () |
Flags the widget for a rerun of the size_allocate_vfunc() function. | |
void | size_allocate (const Allocation &allocation, int baseline) |
Allocates widget with a transformation that translates the origin to the position in allocation. | |
SizeRequestMode | get_request_mode () const |
Gets whether the widget prefers a height-for-width layout or a width-for-height layout. | |
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. | |
Measurements | measure (Orientation orientation, int for_size=-1) const |
Like the other overload of measure() but returns a structure holding the sizes/baselines instead of using output parameters. | |
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. | |
PreferredSize | get_preferred_size () const |
Like the other overload of get_preferred_size() but returns a structure holding the sizes instead of using output parameters. | |
void | set_layout_manager (const Glib::RefPtr< LayoutManager > &layout_manager) |
Sets the layout manager to use for measuring and allocating children of the widget. | |
void | unset_layout_manager () |
Undoes the effect of a previous call to set_layout_manager(). | |
Glib::RefPtr< LayoutManager > | get_layout_manager () |
Retrieves the layout manager of the widget. | |
Glib::RefPtr< const LayoutManager > | get_layout_manager () const |
Retrieves the layout manager of the widget. | |
bool | mnemonic_activate (bool group_cycling) |
Emits the signal_mnemonic_activate() signal. | |
bool | activate () |
For widgets that can be “activated” (buttons, menu items, etc.) this function activates them. | |
void | set_can_focus (bool can_focus=true) |
Sets whether the input focus can enter the widget or any of its children. | |
bool | get_can_focus () const |
Determines whether the input focus can enter the widget or any of its children. | |
void | set_focusable (bool focusable=true) |
Sets whether the widget can own the input focus. | |
bool | get_focusable () const |
Determines whether the widget can own the input focus. | |
bool | has_focus () const |
Determines if the widget has the global input focus. | |
bool | is_focus () const |
Determines if the widget is the focus widget within its toplevel. | |
bool | has_visible_focus () const |
Determines if the widget should show a visible indication that it has the global input focus. | |
bool | grab_focus () |
Causes widget to have the keyboard focus for the window that it belongs to. | |
void | set_focus_on_click (bool focus_on_click=true) |
Sets whether the widget should grab focus when it is clicked with the mouse. | |
bool | get_focus_on_click () const |
Returns whether the widget should grab focus when it is clicked with the mouse. | |
void | set_can_target (bool can_target=true) |
Sets whether the widget can be the target of pointer events. | |
bool | get_can_target () const |
Queries whether the widget can be the target of pointer events. | |
bool | has_default () const |
Determines whether the widget is the current default widget within its toplevel. | |
void | set_receives_default (bool receives_default=true) |
Sets whether the widget will be treated as the default widget within its toplevel when it has the focus, even if another widget is the default. | |
bool | get_receives_default () const |
Determines whether the widget is always treated as the default widget within its toplevel when it has the focus, even if another widget is the default. | |
void | set_name (const Glib::ustring & name) |
Sets a widgets name. | |
void | unset_name () |
Glib::ustring | get_name () const |
Retrieves the name of a widget. | |
void | set_state_flags (StateFlags flags, bool clear=true) |
Turns on flag values in the current widget state. | |
void | unset_state_flags (StateFlags flags) |
Turns off flag values for the current widget state. | |
StateFlags | get_state_flags () const |
Returns the widget state as a flag set. | |
void | set_sensitive (bool sensitive=true) |
Sets the sensitivity of the widget. | |
bool | get_sensitive () const |
Returns the widget’s sensitivity. | |
bool | is_sensitive () const |
Returns the widget’s effective sensitivity. | |
void | set_visible (bool visible=true) |
Sets the visibility state of widget. | |
bool | get_visible () const |
Determines whether the widget is visible. | |
bool | is_visible () const |
Determines whether the widget and all its parents are marked as visible. | |
bool | is_drawable () const |
Determines whether the widget can be drawn to. | |
bool | get_realized () const |
Determines whether the widget is realized. | |
bool | get_mapped () const |
Returns whether the widget is mapped. | |
void | set_child_visible (bool visible=true) |
Sets whether the widget should be mapped along with its parent. | |
bool | get_child_visible () const |
Gets the value set with set_child_visible(). | |
int | get_allocated_width () const |
Returns the width that has currently been allocated to the widget. | |
int | get_allocated_height () const |
Returns the height that has currently been allocated to the widget. | |
int | get_allocated_baseline () const |
Returns the baseline that has currently been allocated to the widget. | |
Allocation | get_allocation () const |
Retrieves the widget’s location. | |
std::optional< Gdk::Graphene::Rect > | compute_bounds (const Widget & target) const |
Computes the bounds for the widget in the coordinate space of target. | |
std::optional< Gdk::Graphene::Point > | compute_point (const Widget & target, const Gdk::Graphene::Point &point) const |
Translates the given point in the widget's coordinates to coordinates relative to target’s coordinate system. | |
int | get_width () const |
Returns the content width of the widget. | |
int | get_height () const |
Returns the content height of the widget. | |
int | get_baseline () const |
Returns the baseline that has currently been allocated to the widget. | |
int | get_size (Orientation orientation) const |
Returns the content width or height of the widget. | |
Widget * | get_parent () |
Returns the parent widget of the widget. | |
const Widget * | get_parent () const |
Returns the parent widget of the widget. | |
Root * | get_root () |
Returns the Gtk::Root widget of the widget. | |
const Root * | get_root () const |
Returns the Gtk::Root widget of the widget. | |
Native * | get_native () |
Returns the nearest Gtk::Native ancestor of the widget. | |
const Native * | get_native () const |
Returns the nearest Gtk::Native ancestor of the widget. | |
bool | child_focus (DirectionType direction) |
Called by widgets as the user moves around the window using keyboard shortcuts. | |
bool | keynav_failed (DirectionType direction) |
Emits the signal_keynav_failed() signal on the widget. | |
void | error_bell () |
Notifies the user about an input-related error on the widget. | |
void | set_size_request (int width=-1, int height=-1) |
Sets the minimum size of the widget. | |
void | get_size_request (int & width, int &height) const |
Gets the size request that was explicitly set for the widget. | |
Requisition | get_size_request () const |
Like the other overload of get_size_request() but returns a structure holding the sizes instead of using output parameters. | |
void | set_opacity (double opacity) |
Requests the widget to be rendered partially transparent. | |
double | get_opacity () const |
Fetches the requested opacity for the widget. | |
void | set_overflow (Overflow overflow) |
Sets how the widget treats content that is drawn outside the it's content area. | |
Overflow | get_overflow () const |
Returns the widget’s overflow value. | |
Widget * | get_ancestor (GType widget_type) |
Gets the first ancestor of the widget with type widget_type. | |
const Widget * | get_ancestor (GType widget_type) const |
Gets the first ancestor of the widget with type widget_type. | |
int | get_scale_factor () const |
Retrieves the internal scale factor that maps from window coordinates to the actual device pixels. | |
Glib::RefPtr< Gdk::Display > | get_display () |
Get the display for the window that the widget belongs to. | |
Glib::RefPtr< const Gdk::Display > | get_display () const |
Get the display for the window that the widget belongs to. | |
Glib::RefPtr< Settings > | get_settings () |
Gets the settings object holding the settings used for the widget. | |
Glib::RefPtr< Gdk::Clipboard > | get_clipboard () |
Gets the clipboard object for the widget. | |
Glib::RefPtr< const Gdk::Clipboard > | get_clipboard () const |
Gets the clipboard object for the widget. | |
Glib::RefPtr< Gdk::Clipboard > | get_primary_clipboard () |
Gets the primary clipboard of the widget. | |
Glib::RefPtr< const Gdk::Clipboard > | get_primary_clipboard () const |
Gets the primary clipboard of the widget. | |
bool | get_hexpand () const |
Gets whether the widget would like any available extra horizontal space. | |
void | set_hexpand (bool expand=true) |
Sets whether the widget would like any available extra horizontal space. | |
bool | get_hexpand_set () const |
Gets whether the hexpand flag has been explicitly set. | |
void | set_hexpand_set (bool set=true) |
Sets whether the hexpand flag will be used. | |
bool | get_vexpand () const |
Gets whether the widget would like any available extra vertical space. | |
void | set_vexpand (bool expand=true) |
Sets whether the widget would like any available extra vertical space. | |
bool | get_vexpand_set () const |
Gets whether the vexpand flag has been explicitly set. | |
void | set_vexpand_set (bool set=true) |
Sets whether the vexpand flag will be used. | |
bool | compute_expand (Orientation orientation) |
Computes whether a parent widget should give this widget extra space when possible. | |
void | set_expand (bool expand=true) |
Sets whether the widget would like any available extra space in both directions. | |
Align | get_halign () const |
Gets the horizontal alignment of the widget. | |
void | set_halign (Align align) |
Sets the horizontal alignment of the widget. | |
Align | get_valign () const |
Gets the vertical alignment of the widget. | |
void | set_valign (Align align) |
Sets the vertical alignment of the widget. | |
int | get_margin_start () const |
Gets the start margin of the widget. | |
void | set_margin_start (int margin) |
Sets the start margin of the widget. | |
int | get_margin_end () const |
Gets the end margin of the widget. | |
void | set_margin_end (int margin) |
Sets the end margin of the widget. | |
int | get_margin_top () const |
Gets the top margin of the widget. | |
void | set_margin_top (int margin) |
Sets the top margin of the widget. | |
int | get_margin_bottom () const |
Gets the bottom margin of the widget. | |
void | set_margin_bottom (int margin) |
Sets the bottom margin of the widget. | |
void | set_margin (int margin) |
Set all 4 margins to the same value. | |
bool | is_ancestor (Widget &ancestor) const |
Determines whether the widget is a descendent of ancestor. | |
bool | translate_coordinates (Widget &dest_widget, double src_x, double src_y, double &dest_x, double &dest_y) |
Translates coordinates relative to src_widget’s allocation to coordinates relative to dest_widget’s allocations. | |
bool | contains (double x, double y) const |
Tests if a given point is contained in the widget. | |
Widget * | pick (double x, double y, PickFlags flags=PickFlags::DEFAULT) |
Finds the descendant of the widget closest to a point. | |
const Widget * | pick (double x, double y, PickFlags flags=PickFlags::DEFAULT) const |
Finds the descendant of the widget closest to a point. | |
void | add_controller (const Glib::RefPtr< EventController > &controller) |
Adds an event controller to the widget. | |
void | remove_controller (const Glib::RefPtr< EventController > &controller) |
Removes an event controller from the widget. | |
Glib::RefPtr< Pango::Context > | create_pango_context () |
Creates a new Pango::Context that is configured for the widget. | |
Glib::RefPtr< Pango::Context > | get_pango_context () |
Gets a Pango::Context that is configured for the widget. | |
void | set_font_options (const Cairo::FontOptions &options) |
Sets the cairo_font_options_t used for text rendering in the widget. | |
void | unset_font_options () |
Undoes the effect of previous calls to set_font_options(). | |
Cairo::FontOptions | get_font_options () const |
Returns the cairo_font_options_t of the widget. | |
Glib::RefPtr< Pango::Layout > | create_pango_layout (const Glib::ustring &text) |
Creates a new Pango::Layout that is configured for the widget. | |
void | set_direction (TextDirection dir) |
Sets the reading direction on the widget. | |
TextDirection | get_direction () const |
Gets the reading direction for the widget. | |
void | set_cursor (const Glib::RefPtr< Gdk::Cursor > &cursor) |
Sets the cursor to be shown when the pointer hovers over the widget. | |
void | set_cursor (const Glib::ustring & name={}) |
Sets a named cursor to be shown when pointer devices point towards the widget. | |
Glib::RefPtr< Gdk::Cursor > | get_cursor () |
Gets the cursor set on the widget. | |
Glib::RefPtr< const Gdk::Cursor > | get_cursor () const |
Gets the cursor set on the widget. | |
std::vector< Widget * > | list_mnemonic_labels () |
Returns the widgets for which this widget is the target of a mnemonic. | |
std::vector< const Widget * > | list_mnemonic_labels () const |
Returns the widgets for which this widget is the target of a mnemonic. | |
void | add_mnemonic_label (Widget &label) |
Adds a widget to the list of mnemonic labels for this widget. | |
void | remove_mnemonic_label (Widget &label) |
Removes a widget from the list of mnemonic labels for this widget. | |
bool | drag_check_threshold (int start_x, int start_y, int current_x, int current_y) |
Checks to see if a drag movement has passed the GTK drag threshold. | |
Glib::RefPtr< Gdk::FrameClock > | get_frame_clock () |
Obtains the frame clock for a widget. | |
Glib::RefPtr< const Gdk::FrameClock > | get_frame_clock () const |
Obtains the frame clock for a widget. | |
void | set_parent (Widget & parent) |
Sets the parent widget of the widget. | |
void | unparent () |
Removes widget from its parent. | |
void | map () |
Causes a widget to be mapped if it isn’t already. | |
void | unmap () |
Causes a widget to be unmapped if it’s currently mapped. | |
void | trigger_tooltip_query () |
Triggers a tooltip query on the display of the widget. | |
void | set_tooltip_text (const Glib::ustring &text) |
Sets the contents of the tooltip for the widget. | |
Glib::ustring | get_tooltip_text () const |
Gets the contents of the tooltip for the widget. | |
void | set_tooltip_markup (const Glib::ustring &markup) |
Sets the contents of the tooltip for widget. | |
Glib::ustring | get_tooltip_markup () const |
Gets the contents of the tooltip for the widget. | |
void | set_has_tooltip (bool has_tooltip=TRUE) |
Sets the has-tooltip property on the widget. | |
bool | get_has_tooltip () const |
Returns the current value of the has-tooltip property. | |
bool | in_destruction () const |
Returns whether the widget is currently being destroyed. | |
Glib::RefPtr< StyleContext > | get_style_context () |
Returns the style context associated to the widget. | |
Glib::RefPtr< const StyleContext > | get_style_context () const |
Returns the style context associated to the widget. | |
guint | add_tick_callback (const SlotTick & slot) |
Queues an animation frame update and adds a callback to be called before each frame. | |
void | remove_tick_callback (guint id) |
Removes a tick callback previously registered with add_tick_callback(). | |
void | insert_action_group (const Glib::ustring & name, const Glib::RefPtr< Gio::ActionGroup > & group) |
Inserts an action group into the widget's actions. | |
void | remove_action_group (const Glib::ustring & name) |
Removes a group from the widget. | |
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. | |
void | activate_default () |
Activates the default.activate action for the widget. | |
void | set_font_map (const Glib::RefPtr< Pango::FontMap > &font_map) |
Sets the font map to use for text rendering in the widget. | |
Glib::RefPtr< Pango::FontMap > | get_font_map () |
Gets the font map of the widget. | |
Glib::RefPtr< const Pango::FontMap > | get_font_map () const |
Gets the font map of the widget. | |
Widget * | get_first_child () |
Returns the widget’s first child. | |
const Widget * | get_first_child () const |
Returns the widget’s first child. | |
Widget * | get_last_child () |
Returns the widget’s last child. | |
const Widget * | get_last_child () const |
Returns the widget’s last child. | |
Widget * | get_next_sibling () |
Returns the widget’s next sibling. | |
const Widget * | get_next_sibling () const |
Returns the widget’s next sibling. | |
Widget * | get_prev_sibling () |
Returns the widget’s previous sibling. | |
const Widget * | get_prev_sibling () const |
Returns the widget’s previous sibling. | |
std::vector< Widget * > | get_children () |
Gets a vector of the widgetʼs current children, from first child to last. | |
std::vector< const Widget * > | get_children () const |
Gets a vector of the widgetʼs current children, from first child to last. | |
Glib::RefPtr< Gio::ListModel > | observe_children () |
Returns a list model to track the children of the widget. | |
Glib::RefPtr< const Gio::ListModel > | observe_children () const |
Returns a list model to track the children of the widget. | |
Glib::RefPtr< Gio::ListModel > | observe_controllers () |
Returns a list model to track the event controllers of the widget. | |
Glib::RefPtr< const Gio::ListModel > | observe_controllers () const |
Returns a list model to track the event controllers of the widget. | |
void | insert_after (Widget & parent, const Widget &previous_sibling) |
Inserts the Widget into the child widget list of parent after previous_sibling. | |
void | insert_before (Widget & parent, const Widget & next_sibling) |
Inserts the Widget into the child widget list of parent before next_sibling. | |
void | insert_at_start (Widget & parent) |
Inserts the Widget at the beginning of the child widget list of parent. | |
void | insert_at_end (Widget & parent) |
Inserts the Widget at the end of the child widget list of parent. | |
void | snapshot_child (Widget &child, const Glib::RefPtr< Gtk::Snapshot > & snapshot) |
Snapshots a child of the widget. | |
bool | should_layout () const |
Returns whether the widget should contribute to the measuring and allocation of its parent. | |
Glib::ustring | get_css_name () const |
Returns the CSS name of the widget. | |
void | add_css_class (const Glib::ustring &css_class) |
Adds a style class to the widget. | |
void | remove_css_class (const Glib::ustring &css_class) |
Removes a style from the widget. | |
bool | has_css_class (const Glib::ustring &css_class) const |
Returns whether a style class is currently applied to the widget. | |
std::vector< Glib::ustring > | get_css_classes () const |
Returns the list of style classes applied to the widget. | |
void | set_css_classes (const std::vector< Glib::ustring > &classes) |
Replaces the current style classes of the widget with classes. | |
Gdk::RGBA | get_color () const |
Gets the current foreground color for the widget's CSS style. | |
void | set_limit_events (bool limit_events=true) |
Sets whether the widget acts like a modal dialog, with respect to event delivery. | |
bool | get_limit_events () const |
Gets the value of the property_limit_events() property. | |
Glib::SignalProxy< void()> | signal_show () |
Glib::SignalProxy< void()> | signal_hide () |
Glib::SignalProxy< void()> | signal_map () |
Emitted on mapping of a widget to the screen. | |
Glib::SignalProxy< void()> | signal_unmap () |
Glib::SignalProxy< void()> | signal_realize () |
Emitted on realization of a widget. | |
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< void()> | signal_destroy () |
Emitted during the dispose phase. | |
Glib::SignalProxy< bool(int, int, bool, const Glib::RefPtr< Tooltip > &)> | signal_query_tooltip () |
Glib::PropertyProxy< Glib::ustring > | property_name () |
The name of the widget. | |
Glib::PropertyProxy_ReadOnly< Glib::ustring > | property_name () const |
The name of the widget. | |
Glib::PropertyProxy_ReadOnly< Widget * > | property_parent () const |
The parent widget of this widget. | |
Glib::PropertyProxy_ReadOnly< Root * > | property_root () const |
The Gtk::Root widget of the widget tree containing this widget. | |
Glib::PropertyProxy< int > | property_width_request () |
Overrides for width request of the widget. | |
Glib::PropertyProxy_ReadOnly< int > | property_width_request () const |
Overrides for width request of the widget. | |
Glib::PropertyProxy< int > | property_height_request () |
Overrides for height request of the widget. | |
Glib::PropertyProxy_ReadOnly< int > | property_height_request () const |
Overrides for height request of the widget. | |
Glib::PropertyProxy< bool > | property_visible () |
Whether the widget is visible. | |
Glib::PropertyProxy_ReadOnly< bool > | property_visible () const |
Whether the widget is visible. | |
Glib::PropertyProxy< bool > | property_sensitive () |
Whether the widget responds to input. | |
Glib::PropertyProxy_ReadOnly< bool > | property_sensitive () const |
Whether the widget responds to input. | |
Glib::PropertyProxy< bool > | property_can_focus () |
Whether the widget or any of its descendents can accept the input focus. | |
Glib::PropertyProxy_ReadOnly< bool > | property_can_focus () const |
Whether the widget or any of its descendents can accept the input focus. | |
Glib::PropertyProxy_ReadOnly< bool > | property_has_focus () const |
Whether the widget has the input focus. | |
Glib::PropertyProxy< bool > | property_can_target () |
Whether the widget can receive pointer events. | |
Glib::PropertyProxy_ReadOnly< bool > | property_can_target () const |
Whether the widget can receive pointer events. | |
Glib::PropertyProxy< bool > | property_focus_on_click () |
Whether the widget should grab focus when it is clicked with the mouse. | |
Glib::PropertyProxy_ReadOnly< bool > | property_focus_on_click () const |
Whether the widget should grab focus when it is clicked with the mouse. | |
Glib::PropertyProxy< bool > | property_focusable () |
Whether this widget itself will accept the input focus. | |
Glib::PropertyProxy_ReadOnly< bool > | property_focusable () const |
Whether this widget itself will accept the input focus. | |
Glib::PropertyProxy_ReadOnly< bool > | property_has_default () const |
Whether the widget is the default widget. | |
Glib::PropertyProxy< bool > | property_receives_default () |
Whether the widget will receive the default action when it is focused. | |
Glib::PropertyProxy_ReadOnly< bool > | property_receives_default () const |
Whether the widget will receive the default action when it is focused. | |
Glib::PropertyProxy< Glib::RefPtr< Gdk::Cursor > > | property_cursor () |
The cursor used by widget. | |
Glib::PropertyProxy_ReadOnly< Glib::RefPtr< Gdk::Cursor > > | property_cursor () const |
The cursor used by widget. | |
Glib::PropertyProxy< bool > | property_has_tooltip () |
Enables or disables the emission of the signal_query_tooltip() signal on widget. | |
Glib::PropertyProxy_ReadOnly< bool > | property_has_tooltip () const |
Enables or disables the emission of the signal_query_tooltip() signal on widget. | |
Glib::PropertyProxy< Glib::ustring > | property_tooltip_markup () |
Sets the text of tooltip to be the given string, which is marked up with Pango markup. | |
Glib::PropertyProxy_ReadOnly< Glib::ustring > | property_tooltip_markup () const |
Sets the text of tooltip to be the given string, which is marked up with Pango markup. | |
Glib::PropertyProxy< Glib::ustring > | property_tooltip_text () |
Sets the text of tooltip to be the given string. | |
Glib::PropertyProxy_ReadOnly< Glib::ustring > | property_tooltip_text () const |
Sets the text of tooltip to be the given string. | |
Glib::PropertyProxy< Align > | property_halign () |
How to distribute horizontal space if widget gets extra space. | |
Glib::PropertyProxy_ReadOnly< Align > | property_halign () const |
How to distribute horizontal space if widget gets extra space. | |
Glib::PropertyProxy< Align > | property_valign () |
How to distribute vertical space if widget gets extra space. | |
Glib::PropertyProxy_ReadOnly< Align > | property_valign () const |
How to distribute vertical space if widget gets extra space. | |
Glib::PropertyProxy< int > | property_margin_start () |
Margin on start of widget, horizontally. | |
Glib::PropertyProxy_ReadOnly< int > | property_margin_start () const |
Margin on start of widget, horizontally. | |
Glib::PropertyProxy< int > | property_margin_end () |
Margin on end of widget, horizontally. | |
Glib::PropertyProxy_ReadOnly< int > | property_margin_end () const |
Margin on end of widget, horizontally. | |
Glib::PropertyProxy< int > | property_margin_top () |
Margin on top side of widget. | |
Glib::PropertyProxy_ReadOnly< int > | property_margin_top () const |
Margin on top side of widget. | |
Glib::PropertyProxy< int > | property_margin_bottom () |
Margin on bottom side of widget. | |
Glib::PropertyProxy_ReadOnly< int > | property_margin_bottom () const |
Margin on bottom side of widget. | |
Glib::PropertyProxy< bool > | property_hexpand () |
Whether to expand horizontally. | |
Glib::PropertyProxy_ReadOnly< bool > | property_hexpand () const |
Whether to expand horizontally. | |
Glib::PropertyProxy< bool > | property_hexpand_set () |
Whether to use the hexpand property. | |
Glib::PropertyProxy_ReadOnly< bool > | property_hexpand_set () const |
Whether to use the hexpand property. | |
Glib::PropertyProxy< bool > | property_vexpand () |
Whether to expand vertically. | |
Glib::PropertyProxy_ReadOnly< bool > | property_vexpand () const |
Whether to expand vertically. | |
Glib::PropertyProxy< bool > | property_vexpand_set () |
Whether to use the vexpand property. | |
Glib::PropertyProxy_ReadOnly< bool > | property_vexpand_set () const |
Whether to use the vexpand property. | |
Glib::PropertyProxy< double > | property_opacity () |
The requested opacity of the widget. | |
Glib::PropertyProxy_ReadOnly< double > | property_opacity () const |
The requested opacity of the widget. | |
Glib::PropertyProxy< Overflow > | property_overflow () |
How content outside the widget's content area is treated. | |
Glib::PropertyProxy_ReadOnly< Overflow > | property_overflow () const |
How content outside the widget's content area is treated. | |
Glib::PropertyProxy_ReadOnly< int > | property_scale_factor () const |
The scale factor of the widget. | |
Glib::PropertyProxy_ReadOnly< Glib::ustring > | property_css_name () const |
The name of this widget in the CSS tree. | |
Glib::PropertyProxy< std::vector< Glib::ustring > > | property_css_classes () |
A list of css classes applied to this widget. | |
Glib::PropertyProxy_ReadOnly< std::vector< Glib::ustring > > | property_css_classes () const |
A list of css classes applied to this widget. | |
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. | |
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. | |
Glib::PropertyProxy< bool > | property_limit_events () |
Makes this widget act like a modal dialog, with respect to event delivery. | |
Glib::PropertyProxy_ReadOnly< bool > | property_limit_events () const |
Makes this widget act like a modal dialog, with respect to event delivery. | |
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Object (Object &&src) noexcept | |
Object & | operator= (Object &&src) noexcept |
~Object () noexcept override | |
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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_with_c_callback (const Quark &key, void *data, GDestroyNotify notify) |
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) |
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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 |
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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 |
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Accessible (Accessible &&src) noexcept | |
Accessible & | operator= (Accessible &&src) noexcept |
~Accessible () noexcept override | |
GtkAccessible * | gobj () |
Provides access to the underlying C GObject. | |
const GtkAccessible * | gobj () const |
Provides access to the underlying C GObject. | |
Glib::RefPtr< ATContext > | get_at_context () |
Retrieves the implementation for the given accessible object. | |
Glib::RefPtr< const ATContext > | get_at_context () const |
Retrieves the implementation for the given accessible object. | |
bool | get_platform_state (PlatformState state) const |
Queries a platform state, such as focus. | |
void | update_platform_state (PlatformState state) |
Informs ATs that the platform state has changed. | |
Glib::RefPtr< Accessible > | get_accessible_parent () |
Retrieves the accessible parent for an accessible object. | |
Glib::RefPtr< const Accessible > | get_accessible_parent () const |
Retrieves the accessible parent for an accessible object. | |
void | set_accessible_parent (const Glib::RefPtr< Accessible > & parent, const Glib::RefPtr< Accessible > & next_sibling) |
Sets the parent and sibling of an accessible object. | |
Glib::RefPtr< Accessible > | get_first_accessible_child () |
Retrieves the first accessible child of an accessible object. | |
Glib::RefPtr< const Accessible > | get_first_accessible_child () const |
Retrieves the first accessible child of an accessible object. | |
Glib::RefPtr< Accessible > | get_next_accessible_sibling () |
Retrieves the next accessible sibling of an accessible object. | |
Glib::RefPtr< const Accessible > | get_next_accessible_sibling () const |
Retrieves the next accessible sibling of an accessible object. | |
void | update_next_accessible_sibling (const Glib::RefPtr< Accessible > &new_sibling) |
Updates the next accessible sibling. | |
bool | get_bounds (int &x, int &y, int & width, int &height) const |
Queries the coordinates and dimensions of this accessible. | |
Role | get_accessible_role () const |
Retrieves the accessible role of an accessible object. | |
void | update_state (State state, const Glib::ValueBase & value) |
Updates an accessible state. | |
void | update_property (Property property, const Glib::ValueBase & value) |
Updates an accessible property. | |
void | update_relation (Relation relation, const Glib::ValueBase & value) |
Updates an accessible relation. | |
void | reset_state (State state) |
Resets the accessible state to its default value. | |
void | reset_property (Property property) |
Resets the accessible property to its default value. | |
void | reset_relation (Relation relation) |
Resets the accessible relation to its default value. | |
void | announce (const Glib::ustring & message, AnnouncementPriority priority) |
Requests the user's screen reader to announce the given message. | |
Glib::PropertyProxy< Role > | property_accessible_role () |
The accessible role of the given Gtk::Accessible implementation. | |
Glib::PropertyProxy_ReadOnly< Role > | property_accessible_role () const |
The accessible role of the given Gtk::Accessible implementation. | |
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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 |
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Buildable (Buildable &&src) noexcept | |
Buildable & | operator= (Buildable &&src) noexcept |
~Buildable () noexcept override | |
GtkBuildable * | gobj () |
Provides access to the underlying C GObject. | |
const GtkBuildable * | gobj () const |
Provides access to the underlying C GObject. | |
Glib::ustring | get_buildable_id () const |
Gets the ID of the buildable object. | |
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ConstraintTarget (ConstraintTarget &&src) noexcept | |
ConstraintTarget & | operator= (ConstraintTarget &&src) noexcept |
~ConstraintTarget () noexcept override | |
GtkConstraintTarget * | gobj () |
Provides access to the underlying C GObject. | |
const GtkConstraintTarget * | gobj () const |
Provides access to the underlying C GObject. | |
Static Public Member Functions | |
static GType | get_type () |
Get the GType for this class, for use with the underlying GObject type system. | |
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static GType | get_type () |
Get the GType for this class, for use with the underlying GObject type system. | |
static void | set_default_direction (TextDirection dir) |
Sets the default reading direction for widgets. | |
static TextDirection | get_default_direction () |
Obtains the default reading direction. | |
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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. | |
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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. | |
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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. | |
Related Symbols | |
(Note that these are not member symbols.) | |
Gtk::Picture * | wrap (GtkPicture *object, bool take_copy=false) |
A Glib::wrap() method for this object. | |
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Gtk::Widget * | wrap (GtkWidget *object, bool take_copy=false) |
A Glib::wrap() method for this object. | |
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Glib::RefPtr< Gtk::Accessible > | wrap (GtkAccessible *object, bool take_copy=false) |
A Glib::wrap() method for this object. | |
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Glib::RefPtr< Gtk::Buildable > | wrap (GtkBuildable *object, bool take_copy=false) |
A Glib::wrap() method for this object. | |
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Glib::RefPtr< Gtk::ConstraintTarget > | wrap (GtkConstraintTarget *object, bool take_copy=false) |
A Glib::wrap() method for this object. | |
A widget displaying a Gdk::Paintable.
The Gtk::Picture widget displays a Gdk::Paintable. Many convenience functions are provided to make pictures simple to use. For example, if you want to load an image from a file, and then display that, there’s a convenience method to do this: set_filename() or the constructor taking a filename parameter.
If the file isn’t loaded successfully, the picture will contain a “broken image” icon similar to that used in many web browsers. If you want to handle errors in loading the file yourself, for example by displaying an error message, then load the file with Gdk::Texture::create_from_file(), then create the Gtk::Picture from the texture.
Sometimes an application will want to avoid depending on external data files, such as image files. See the documentation of Gio::Resource for details. In this case, set_resource() should be used.
You can influence how the paintable is displayed inside the Gtk::Picture by changing property_content_fit(). property_can_shrink() can be unset to make sure that paintables are never made smaller than their ideal size - but be careful if you do not know the size of the paintable in use (like when displaying user-loaded images). This can easily cause the picture to grow larger than the screen. And Gtk::Widget::property_halign() and Gtk::Widget::property_valign() can be used to make sure the paintable doesn't fill all available space but is instead displayed at its original size.
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noexcept |
|
overridenoexcept |
Gtk::Picture::Picture | ( | ) |
|
explicit |
Creates a new Picture displaying paintable.
The Picture will track changes to the paintable and update its size and contents in response to it.
paintable | A Gdk::Paintable or an empty Glib::RefPtr. |
|
explicit |
Creates a new Picture widget displaying pixbuf.
This constructor calls Picture(const Glib::RefPtr<Gdk::Paintable>& paintable). See that constructor for details.
The pixbuf must not be modified after passing it to this constructor.
pixbuf | A Gdk::Pixbuf or an empty Glib::RefPtr. |
|
explicit |
Creates a new Picture displaying the given file.
If the file isn’t found or can’t be loaded, the resulting Picture will be empty.
If you need to detect failures in loading the file, use Gdk::Texture::create_from_file() to load the file yourself, then create the Gtk::Picture from the texture.
file | A Gio::File or an empty Glib::RefPtr. |
|
explicit |
Creates a new Picture displaying the file filename.
This constructor calls Picture(const Glib::RefPtr<Gio::File>& file). See that constructor for details.
filename | A filename or an empty string. |
Glib::ustring Gtk::Picture::get_alternative_text | ( | ) | const |
Gets the alternative textual description of the picture.
The returned string will be nullptr
if the picture cannot be described textually.
bool Gtk::Picture::get_can_shrink | ( | ) | const |
Returns whether the Gtk::Picture
respects its contents size.
true
if the picture can be made smaller than its contents. ContentFit Gtk::Picture::get_content_fit | ( | ) | const |
Returns the fit mode for the content of the Gtk::Picture
.
See Gtk::ContentFit for details.
Glib::RefPtr< Gio::File > Gtk::Picture::get_file | ( | ) |
Gets the Gio::File
currently displayed if self is displaying a file.
If self is not displaying a file, for example when set_paintable() was used, then nullptr
is returned.
Gio::File
displayed by self. Glib::RefPtr< const Gio::File > Gtk::Picture::get_file | ( | ) | const |
Gets the Gio::File
currently displayed if self is displaying a file.
If self is not displaying a file, for example when set_paintable() was used, then nullptr
is returned.
Gio::File
displayed by self. bool Gtk::Picture::get_keep_aspect_ratio | ( | ) | const |
Returns whether the Gtk::Picture
preserves its contents aspect ratio.
Deprecated: 4.8: Use get_content_fit() instead. This will now return false
only if property_content_fit() is Gtk::ContentFit::FILL
. Returns true
otherwise.
true
if the self tries to keep the contents' aspect ratio. Glib::RefPtr< Gdk::Paintable > Gtk::Picture::get_paintable | ( | ) |
Gets the Gdk::Paintable
being displayed by the Gtk::Picture
.
Glib::RefPtr< const Gdk::Paintable > Gtk::Picture::get_paintable | ( | ) | const |
Gets the Gdk::Paintable
being displayed by the Gtk::Picture
.
|
static |
Get the GType for this class, for use with the underlying GObject type system.
|
inline |
Provides access to the underlying C GObject.
|
inline |
Provides access to the underlying C GObject.
Glib::PropertyProxy< Glib::ustring > Gtk::Picture::property_alternative_text | ( | ) |
The alternative textual description for the picture.
Default value: ""
Glib::PropertyProxy_ReadOnly< Glib::ustring > Gtk::Picture::property_alternative_text | ( | ) | const |
The alternative textual description for the picture.
Default value: ""
Glib::PropertyProxy< bool > Gtk::Picture::property_can_shrink | ( | ) |
If the Gtk::Picture
can be made smaller than the natural size of its contents.
Default value: true
Glib::PropertyProxy_ReadOnly< bool > Gtk::Picture::property_can_shrink | ( | ) | const |
If the Gtk::Picture
can be made smaller than the natural size of its contents.
Default value: true
Glib::PropertyProxy< ContentFit > Gtk::Picture::property_content_fit | ( | ) |
How the content should be resized to fit inside the Gtk::Picture
.
Default value: Gtk::ContentFit::CONTAIN
Glib::PropertyProxy_ReadOnly< ContentFit > Gtk::Picture::property_content_fit | ( | ) | const |
How the content should be resized to fit inside the Gtk::Picture
.
Default value: Gtk::ContentFit::CONTAIN
Glib::PropertyProxy< Glib::RefPtr< Gio::File > > Gtk::Picture::property_file | ( | ) |
The Gio::File
that is displayed or nullptr
if none.
Glib::PropertyProxy_ReadOnly< Glib::RefPtr< Gio::File > > Gtk::Picture::property_file | ( | ) | const |
The Gio::File
that is displayed or nullptr
if none.
Glib::PropertyProxy< bool > Gtk::Picture::property_keep_aspect_ratio | ( | ) |
Whether the GtkPicture will render its contents trying to preserve the aspect ratio.
Deprecated: 4.8: Use property_content_fit() instead.
Default value: true
Glib::PropertyProxy_ReadOnly< bool > Gtk::Picture::property_keep_aspect_ratio | ( | ) | const |
Whether the GtkPicture will render its contents trying to preserve the aspect ratio.
Deprecated: 4.8: Use property_content_fit() instead.
Default value: true
Glib::PropertyProxy< Glib::RefPtr< Gdk::Paintable > > Gtk::Picture::property_paintable | ( | ) |
The Gdk::Paintable
to be displayed by this Gtk::Picture
.
Glib::PropertyProxy_ReadOnly< Glib::RefPtr< Gdk::Paintable > > Gtk::Picture::property_paintable | ( | ) | const |
The Gdk::Paintable
to be displayed by this Gtk::Picture
.
void Gtk::Picture::set_alternative_text | ( | const Glib::ustring & | alternative_text | ) |
Sets an alternative textual description for the picture contents.
It is equivalent to the "alt" attribute for images on websites.
This text will be made available to accessibility tools.
If the picture cannot be described textually, set this property to nullptr
.
alternative_text | A textual description of the contents. |
If set to true
, the self can be made smaller than its contents.
The contents will then be scaled down when rendering.
If you want to still force a minimum size manually, consider using Gtk::Widget::set_size_request().
Also of note is that a similar function for growing does not exist because the grow behavior can be controlled via Gtk::Widget::set_halign() and Gtk::Widget::set_valign().
can_shrink | If self can be made smaller than its contents. |
void Gtk::Picture::set_content_fit | ( | ContentFit | content_fit | ) |
Sets how the content should be resized to fit the Gtk::Picture
.
See Gtk::ContentFit for details.
content_fit | The content fit mode. |
void Gtk::Picture::set_file | ( | const Glib::RefPtr< const Gio::File > & | file | ) |
Makes self load and display file.
See new_for_file() for details.
::: warning Note that this function should not be used with untrusted data. Use a proper image loading framework such as libglycin, which can load many image formats into a Gdk::Texture
, and then use Gtk::Image::set_from_paintable().
file | A Gio::File . |
void Gtk::Picture::set_filename | ( | const std::string & | filename | ) |
Makes self load and display the given filename.
This is a utility function that calls set_file().
::: warning Note that this function should not be used with untrusted data. Use a proper image loading framework such as libglycin, which can load many image formats into a Gdk::Texture
, and then use Gtk::Image::set_from_paintable().
filename | The filename to play. |
If set to true
, the self will render its contents according to their aspect ratio.
That means that empty space may show up at the top/bottom or left/right of self.
If set to false
or if the contents provide no aspect ratio, the contents will be stretched over the picture's whole area.
Deprecated: 4.8: Use set_content_fit() instead. If still used, this method will always set the property_content_fit() property to Gtk::ContentFit::CONTAIN
if keep_aspect_ratio is true, otherwise it will set it to Gtk::ContentFit::FILL
.
keep_aspect_ratio | Whether to keep aspect ratio. |
void Gtk::Picture::set_paintable | ( | const Glib::RefPtr< Gdk::Paintable > & | paintable | ) |
Makes self display the given paintable.
If paintable is nullptr
, nothing will be displayed.
See new_for_paintable() for details.
paintable | A Gdk::Paintable . |
void Gtk::Picture::set_pixbuf | ( | const Glib::RefPtr< Gdk::Pixbuf > & | pixbuf | ) |
Sets a Gtk::Picture
to show a Gdk::Pixbuf
.
See new_for_pixbuf() for details.
This is a utility function that calls set_paintable().
Deprecated: 4.12: Use set_paintable() instead
pixbuf | A Gdk::Pixbuf . |
void Gtk::Picture::set_resource | ( | const std::string & | resource_path | ) |
Makes self load and display the resource at the given resource_path.
This is a utility function that calls set_file().
resource_path | The resource to set. |
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related |
A Glib::wrap() method for this object.
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. |