Class
GtkLabel
Description [src]
class Gtk.Label : Gtk.Misc
implements Atk.ImplementorIface, Gtk.Buildable {
/* No available fields */
}The GtkLabel widget displays a small amount of text. As the name
implies, most labels are used to label another widget such as a
GtkButton, a GtkMenuItem, or a GtkComboBox.
CSS nodes
label
├── [selection]
├── [link]
┊
╰── [link]
GtkLabel has a single CSS node with the name label. A wide variety
of style classes may be applied to labels, such as .title, .subtitle,
.dim-label, etc. In the GtkShortcutsWindow, labels are used wth the
.keycap style class.
If the label has a selection, it gets a subnode with name selection.
If the label has links, there is one subnode per link. These subnodes carry the link or visited state depending on whether they have been visited.
GtkLabel as GtkBuildable
The GtkLabel implementation of the GtkBuildable interface supports a
custom <attributes> element, which supports any number of <attribute>
elements. The <attribute> element has attributes named “name“, “value“,
“start“ and “end“ and allows you to specify PangoAttribute values for
this label.
An example of a UI definition fragment specifying Pango attributes:
<object class="GtkLabel">
<attributes>
<attribute name="weight" value="PANGO_WEIGHT_BOLD"/>
<attribute name="background" value="red" start="5" end="10"/>
</attributes>
</object>
The start and end attributes specify the range of characters to which the Pango attribute applies. If start and end are not specified, the attribute is applied to the whole text. Note that specifying ranges does not make much sense with translatable attributes. Use markup embedded in the translatable content instead.
Mnemonics
Labels may contain “mnemonics”. Mnemonics are
underlined characters in the label, used for keyboard navigation.
Mnemonics are created by providing a string with an underscore before
the mnemonic character, such as "_File", to the
functions gtk_label_new_with_mnemonic() or gtk_label_set_text_with_mnemonic().
Mnemonics automatically activate any activatable widget the label is
inside, such as a GtkButton; if the label is not inside the
mnemonic’s target widget, you have to tell the label about the target
using gtk_label_set_mnemonic_widget(). Here’s a simple example where
the label is inside a button:
// Pressing Alt+H will activate this button
GtkWidget *button = gtk_button_new ();
GtkWidget *label = gtk_label_new_with_mnemonic ("_Hello");
gtk_container_add (GTK_CONTAINER (button), label);
There’s a convenience function to create buttons with a mnemonic label already inside:
// Pressing Alt+H will activate this button
GtkWidget *button = gtk_button_new_with_mnemonic ("_Hello");
To create a mnemonic for a widget alongside the label, such as a
GtkEntry, you have to point the label at the entry with gtk_label_set_mnemonic_widget():
// Pressing Alt+H will focus the entry
GtkWidget *entry = gtk_entry_new ();
GtkWidget *label = gtk_label_new_with_mnemonic ("_Hello");
gtk_label_set_mnemonic_widget (GTK_LABEL (label), entry);
Markup (styled text)
To make it easy to format text in a label (changing colors, fonts, etc.), label text can be provided in a simple [markup format][PangoMarkupFormat].
Here’s how to create a label with a small font:
GtkWidget *label = gtk_label_new (NULL);
gtk_label_set_markup (GTK_LABEL (label), "<small>Small text</small>");
(See [complete documentation][PangoMarkupFormat] of available tags in the Pango manual.)
The markup passed to gtk_label_set_markup() must be valid; for example,
literal <, > and & characters must be escaped as <, >, and &.
If you pass text obtained from the user, file, or a network to
gtk_label_set_markup(), you’ll want to escape it with
g_markup_escape_text() or g_markup_printf_escaped().
Markup strings are just a convenient way to set the PangoAttrList on
a label; gtk_label_set_attributes() may be a simpler way to set
attributes in some cases. Be careful though; PangoAttrList tends to
cause internationalization problems, unless you’re applying attributes
to the entire string (i.e. unless you set the range of each attribute
to [0, G_MAXINT)). The reason is that specifying the start_index and
end_index for a PangoAttribute requires knowledge of the exact string
being displayed, so translations will cause problems.
Selectable labels
Labels can be made selectable with gtk_label_set_selectable(). Selectable labels allow the user to copy the label contents to the clipboard. Only labels that contain useful-to-copy information — such as error messages — should be made selectable.
Text layout # {#label-text-layout}
A label can contain any number of paragraphs, but will have performance problems if it contains more than a small number. Paragraphs are separated by newlines or other paragraph separators understood by Pango.
Labels can automatically wrap text if you call gtk_label_set_line_wrap().
gtk_label_set_justify() sets how the lines in a label align
with one another. If you want to set how the label as a whole
aligns in its available space, see the GtkWidget:halign and
GtkWidget:valign properties.
The GtkLabel:width-chars and GtkLabel:max-width-chars properties
can be used to control the size allocation of ellipsized or wrapped
labels. For ellipsizing labels, if either is specified (and less
than the actual text size), it is used as the minimum width, and the actual
text size is used as the natural width of the label. For wrapping labels,
width-chars is used as the minimum width, if specified, and max-width-chars
is used as the natural width. Even if max-width-chars specified, wrapping
labels will be rewrapped to use all of the available width.
Note that the interpretation of GtkLabel:width-chars and
GtkLabel:max-width-chars has changed a bit with the introduction of
[width-for-height geometry management.][geometry-management]
Links
Since 2.18, GTK+ supports markup for clickable hyperlinks in addition
to regular Pango markup. The markup for links is borrowed from HTML,
using the <a> with “href“ and “title“ attributes. GTK+ renders links
similar to the way they appear in web browsers, with colored, underlined
text. The “title“ attribute is displayed as a tooltip on the link.
An example looks like this:
const gchar *text =
"Go to the"
"<a href=\"http://www.gtk.org title=\"<i>Our</i> website\">"
"GTK+ website</a> for more...";
GtkWidget *label = gtk_label_new (NULL);
gtk_label_set_markup (GTK_LABEL (label), text);
It is possible to implement custom handling for links and their tooltips with
the GtkLabel::activate-link signal and the gtk_label_get_current_uri() function.
Constructors
gtk_label_new
Creates a new label with the given text inside it. You can
pass NULL to get an empty label widget.
Instance methods
gtk_label_get_attributes
Gets the attribute list that was set on the label using gtk_label_set_attributes(), if any. This function does not reflect attributes that come from the labels markup (see gtk_label_set_markup()). If you want to get the effective attributes for the label, use pango_layout_get_attribute (gtk_label_get_layout (label)).
gtk_label_get_current_uri
Returns the URI for the currently active link in the label. The active link is the one under the mouse pointer or, in a selectable label, the link in which the text cursor is currently positioned.
since: 2.18
gtk_label_get_ellipsize
Returns the ellipsizing position of the label. See gtk_label_set_ellipsize().
since: 2.6
gtk_label_get_label
Fetches the text from a label widget including any embedded underlines indicating mnemonics and Pango markup. (See gtk_label_get_text()).
gtk_label_get_layout
Gets the PangoLayout used to display the label.
The layout is useful to e.g. convert text positions to
pixel positions, in combination with gtk_label_get_layout_offsets().
The returned layout is owned by the label so need not be
freed by the caller. The label is free to recreate its layout at
any time, so it should be considered read-only.
gtk_label_get_layout_offsets
Obtains the coordinates where the label will draw the PangoLayout
representing the text in the label; useful to convert mouse events
into coordinates inside the PangoLayout, e.g. to take some action
if some part of the label is clicked. Of course you will need to
create a GtkEventBox to receive the events, and pack the label
inside it, since labels are windowless (they return FALSE from
gtk_widget_get_has_window()). Remember
when using the PangoLayout functions you need to convert to
and from pixels using PANGO_PIXELS() or #PANGO_SCALE.
gtk_label_get_line_wrap
Returns whether lines in the label are automatically wrapped. See gtk_label_set_line_wrap().
gtk_label_get_line_wrap_mode
Returns line wrap mode used by the label. See gtk_label_set_line_wrap_mode().
since: 2.10
gtk_label_get_lines
Gets the number of lines to which an ellipsized, wrapping label should be limited. See gtk_label_set_lines().
since: 3.10
gtk_label_get_max_width_chars
Retrieves the desired maximum width of label, in characters. See gtk_label_set_width_chars().
since: 2.6
gtk_label_get_mnemonic_keyval
If the label has been set so that it has an mnemonic key this function returns the keyval used for the mnemonic accelerator. If there is no mnemonic set up it returns #GDK_KEY_VoidSymbol.
gtk_label_get_mnemonic_widget
Retrieves the target of the mnemonic (keyboard shortcut) of this label. See gtk_label_set_mnemonic_widget().
gtk_label_get_selection_bounds
Gets the selected range of characters in the label, returning TRUE
if there’s a selection.
gtk_label_get_text
Fetches the text from a label widget, as displayed on the screen. This does not include any embedded underlines indicating mnemonics or Pango markup. (See gtk_label_get_label()).
gtk_label_get_track_visited_links
Returns whether the label is currently keeping track of clicked links.
since: 2.18
gtk_label_get_use_markup
Returns whether the label’s text is interpreted as marked up with the [Pango text markup language][PangoMarkupFormat]. See gtk_label_set_use_markup ().
gtk_label_get_use_underline
Returns whether an embedded underline in the label indicates a mnemonic. See gtk_label_set_use_underline().
gtk_label_get_width_chars
Retrieves the desired width of label, in characters. See gtk_label_set_width_chars().
since: 2.6
gtk_label_select_region
Selects a range of characters in the label, if the label is selectable.
See gtk_label_set_selectable(). If the label is not selectable,
this function has no effect. If start_offset or
end_offset are -1, then the end of the label will be substituted.
gtk_label_set_angle
Sets the angle of rotation for the label. An angle of 90 reads from from bottom to top, an angle of 270, from top to bottom. The angle setting for the label is ignored if the label is selectable, wrapped, or ellipsized.
since: 2.6
gtk_label_set_attributes
Sets a PangoAttrList; the attributes in the list are applied to the
label text.
gtk_label_set_ellipsize
Sets the mode used to ellipsize (add an ellipsis: “…”) to the text if there is not enough space to render the entire string.
since: 2.6
gtk_label_set_justify
Sets the alignment of the lines in the text of the label relative to
each other. GTK_JUSTIFY_LEFT is the default value when the widget is
first created with gtk_label_new(). If you instead want to set the
alignment of the label as a whole, use gtk_widget_set_halign() instead.
gtk_label_set_justify() has no effect on labels containing only a
single line.
gtk_label_set_label
Sets the text of the label. The label is interpreted as
including embedded underlines and/or Pango markup depending
on the values of the GtkLabel:use-underline and
GtkLabel:use-markup properties.
gtk_label_set_line_wrap
Toggles line wrapping within the GtkLabel widget. TRUE makes it break
lines if text exceeds the widget’s size. FALSE lets the text get cut off
by the edge of the widget if it exceeds the widget size.
gtk_label_set_line_wrap_mode
If line wrapping is on (see gtk_label_set_line_wrap()) this controls how
the line wrapping is done. The default is PANGO_WRAP_WORD which means
wrap on word boundaries.
since: 2.10
gtk_label_set_lines
Sets the number of lines to which an ellipsized, wrapping label should be limited. This has no effect if the label is not wrapping or ellipsized. Set this to -1 if you don’t want to limit the number of lines.
since: 3.10
gtk_label_set_markup
Parses str which is marked up with the
[Pango text markup language][PangoMarkupFormat], setting the
label’s text and attribute list based on the parse results.
gtk_label_set_markup_with_mnemonic
Parses str which is marked up with the
[Pango text markup language][PangoMarkupFormat],
setting the label’s text and attribute list based on the parse results.
If characters in str are preceded by an underscore, they are underlined
indicating that they represent a keyboard accelerator called a mnemonic.
gtk_label_set_max_width_chars
Sets the desired maximum width in characters of label to n_chars.
since: 2.6
gtk_label_set_mnemonic_widget
If the label has been set so that it has an mnemonic key (using
i.e. gtk_label_set_markup_with_mnemonic(),
gtk_label_set_text_with_mnemonic(), gtk_label_new_with_mnemonic()
or the “use_underline” property) the label can be associated with a
widget that is the target of the mnemonic. When the label is inside
a widget (like a GtkButton or a GtkNotebook tab) it is
automatically associated with the correct widget, but sometimes
(i.e. when the target is a GtkEntry next to the label) you need to
set it explicitly using this function.
gtk_label_set_pattern
The pattern of underlines you want under the existing text within the
GtkLabel widget. For example if the current text of the label says
“FooBarBaz” passing a pattern of “ ” will underline
“Foo” and “Baz” but not “Bar”.
gtk_label_set_selectable
Selectable labels allow the user to select text from the label, for copy-and-paste.
gtk_label_set_text
Sets the text within the GtkLabel widget. It overwrites any text that
was there before.
gtk_label_set_text_with_mnemonic
Sets the label’s text from the string str.
If characters in str are preceded by an underscore, they are underlined
indicating that they represent a keyboard accelerator called a mnemonic.
The mnemonic key can be used to activate another widget, chosen
automatically, or explicitly using gtk_label_set_mnemonic_widget().
gtk_label_set_track_visited_links
Sets whether the label should keep track of clicked links (and use a different color for them).
since: 2.18
gtk_label_set_use_markup
Sets whether the text of the label contains markup in [Pango’s text markup language][PangoMarkupFormat]. See gtk_label_set_markup().
gtk_label_set_use_underline
If true, an underline in the text indicates the next character should be used for the mnemonic accelerator key.
Methods inherited from GtkMisc (4)
gtk_misc_get_alignment
Gets the X and Y alignment of the widget within its allocation. See gtk_misc_set_alignment().
deprecated: 3.14
gtk_misc_get_padding
Gets the padding in the X and Y directions of the widget. See gtk_misc_set_padding().
deprecated: 3.14
gtk_misc_set_alignment
Sets the alignment of the widget.
deprecated: 3.14
gtk_misc_set_padding
Sets the amount of space to add around the widget.
deprecated: 3.14
Methods inherited from GtkBuildable (10)
gtk_buildable_add_child
Adds a child to buildable. type is an optional string
describing how the child should be added.
since: 2.12
gtk_buildable_construct_child
Constructs a child of buildable with the name name.
since: 2.12
gtk_buildable_custom_finished
This is similar to gtk_buildable_parser_finished() but is
called once for each custom tag handled by the buildable.
since: 2.12
gtk_buildable_custom_tag_end
This is called at the end of each custom element handled by the buildable.
since: 2.12
gtk_buildable_custom_tag_start
This is called for each unknown element under <child>.
since: 2.12
gtk_buildable_get_internal_child
Get the internal child called childname of the buildable object.
since: 2.12
gtk_buildable_get_name
Gets the name of the buildable object.
since: 2.12
gtk_buildable_parser_finished
Called when the builder finishes the parsing of a
[GtkBuilder UI definition][BUILDER-UI].
Note that this will be called once for each time
gtk_builder_add_from_file() or gtk_builder_add_from_string()
is called on a builder.
since: 2.12
gtk_buildable_set_buildable_property
Sets the property name name to value on the buildable object.
since: 2.12
gtk_buildable_set_name
Sets the name of the buildable object.
since: 2.12
Properties
Gtk.Label:angle
The angle that the baseline of the label makes with the horizontal, in degrees, measured counterclockwise. An angle of 90 reads from from bottom to top, an angle of 270, from top to bottom. Ignored if the label is selectable.
since: 2.6
Gtk.Label:ellipsize
The preferred place to ellipsize the string, if the label does
not have enough room to display the entire string, specified as a
PangoEllipsizeMode.
since: 2.6
Gtk.Label:lines
The number of lines to which an ellipsized, wrapping label should be limited. This property has no effect if the label is not wrapping or ellipsized. Set this property to -1 if you don’t want to limit the number of lines.
since: 3.10
Gtk.Label:max-width-chars
The desired maximum width of the label, in characters. If this property is set to -1, the width will be calculated automatically.
since: 2.6
Gtk.Label:single-line-mode
Whether the label is in single line mode. In single line mode, the height of the label does not depend on the actual text, it is always set to ascent + descent of the font. This can be an advantage in situations where resizing the label because of text changes would be distracting, e.g. in a statusbar.
since: 2.6
Gtk.Label:track-visited-links
Set this property to TRUE to make the label track which links
have been visited. It will then apply the #GTK_STATE_FLAG_VISITED
when rendering this link, in addition to #GTK_STATE_FLAG_LINK.
since: 2.18
Gtk.Label:width-chars
The desired width of the label, in characters. If this property is set to -1, the width will be calculated automatically.
since: 2.6
Gtk.Label:wrap-mode
If line wrapping is on (see the GtkLabel:wrap property) this controls
how the line wrapping is done. The default is PANGO_WRAP_WORD, which
means wrap on word boundaries.
since: 2.10
Gtk.Label:xalign
The xalign property determines the horizontal aligment of the label text
inside the labels size allocation. Compare this to GtkWidget:halign,
which determines how the labels size allocation is positioned in the
space available for the label.
since: 3.16
Gtk.Label:yalign
The yalign property determines the vertical aligment of the label text
inside the labels size allocation. Compare this to GtkWidget:valign,
which determines how the labels size allocation is positioned in the
space available for the label.
since: 3.16
Properties inherited from GtkMisc (4)
Gtk.Misc:xalign
The horizontal alignment. A value of 0.0 means left alignment (or right on RTL locales); a value of 1.0 means right alignment (or left on RTL locales).
deprecated: 3.14
Gtk.Misc:xpad
The amount of space to add on the left and right of the widget, in pixels.
deprecated: 3.14
Gtk.Misc:yalign
The vertical alignment. A value of 0.0 means top alignment; a value of 1.0 means bottom alignment.
deprecated: 3.14
Gtk.Misc:ypad
The amount of space to add on the top and bottom of the widget, in pixels.
deprecated: 3.14
Properties inherited from GtkWidget (39)
Gtk.Widget:app-paintable
Gtk.Widget:can-default
Gtk.Widget:can-focus
Gtk.Widget:composite-child
Gtk.Widget:double-buffered
Whether the widget is double buffered.
deprecated: 3.14 since: 2.18
Gtk.Widget:events
Gtk.Widget:expand
Whether to expand in both directions. Setting this sets both GtkWidget:hexpand and GtkWidget:vexpand.
since: 3.0
Gtk.Widget:focus-on-click
Whether the widget should grab focus when it is clicked with the mouse.
since: 3.20
Gtk.Widget:halign
How to distribute horizontal space if widget gets extra space, see GtkAlign.
since: 3.0
Gtk.Widget:has-default
Gtk.Widget:has-focus
Gtk.Widget:has-tooltip
Enables or disables the emission of GtkWidget::query-tooltip on widget.
A value of TRUE indicates that widget can have a tooltip, in this case
the widget will be queried using GtkWidget::query-tooltip to determine
whether it will provide a tooltip or not.
since: 2.12
Gtk.Widget:height-request
Gtk.Widget:hexpand
Whether to expand horizontally. See gtk_widget_set_hexpand().
since: 3.0
Gtk.Widget:hexpand-set
Whether to use the GtkWidget:hexpand property. See gtk_widget_get_hexpand_set().
since: 3.0
Gtk.Widget:is-focus
Gtk.Widget:margin
Sets all four sides’ margin at once. If read, returns max margin on any side.
since: 3.0
Gtk.Widget:margin-bottom
Margin on bottom side of widget.
since: 3.0
Gtk.Widget:margin-end
Margin on end of widget, horizontally. This property supports left-to-right and right-to-left text directions.
since: 3.12
Gtk.Widget:margin-left
Margin on left side of widget.
deprecated: 3.12 since: 3.0
Gtk.Widget:margin-right
Margin on right side of widget.
deprecated: 3.12 since: 3.0
Gtk.Widget:margin-start
Margin on start of widget, horizontally. This property supports left-to-right and right-to-left text directions.
since: 3.12
Gtk.Widget:margin-top
Margin on top side of widget.
since: 3.0
Gtk.Widget:name
Gtk.Widget:no-show-all
Gtk.Widget:opacity
The requested opacity of the widget. See gtk_widget_set_opacity() for
more details about window opacity.
since: 3.8
Gtk.Widget:parent
Gtk.Widget:receives-default
Gtk.Widget:scale-factor
The scale factor of the widget. See gtk_widget_get_scale_factor() for
more details about widget scaling.
since: 3.10
Gtk.Widget:sensitive
Gtk.Widget:style
The style of the widget, which contains information about how it will look (colors, etc).
deprecated: Unknown
Gtk.Widget:tooltip-markup
Sets the text of tooltip to be the given string, which is marked up with the [Pango text markup language][PangoMarkupFormat]. Also see gtk_tooltip_set_markup().
since: 2.12
Gtk.Widget:tooltip-text
Sets the text of tooltip to be the given string.
since: 2.12
Gtk.Widget:valign
How to distribute vertical space if widget gets extra space, see GtkAlign.
since: 3.0
Gtk.Widget:vexpand
Whether to expand vertically. See gtk_widget_set_vexpand().
since: 3.0
Gtk.Widget:vexpand-set
Whether to use the GtkWidget:vexpand property. See gtk_widget_get_vexpand_set().
since: 3.0
Gtk.Widget:visible
Gtk.Widget:width-request
Gtk.Widget:window
The widget’s window if it is realized, NULL otherwise.
since: 2.14
Signals
Gtk.Label::activate-current-link
A [keybinding signal][GtkBindingSignal] which gets emitted when the user activates a link in the label.
since: 2.18
Gtk.Label::activate-link
The signal which gets emitted to activate a URI. Applications may connect to it to override the default behaviour, which is to call gtk_show_uri_on_window().
since: 2.18
Gtk.Label::copy-clipboard
The ::copy-clipboard signal is a [keybinding signal][GtkBindingSignal] which gets emitted to copy the selection to the clipboard.
Gtk.Label::move-cursor
The ::move-cursor signal is a
[keybinding signal][GtkBindingSignal]
which gets emitted when the user initiates a cursor movement.
If the cursor is not visible in entry, this signal causes
the viewport to be moved instead.
Gtk.Label::populate-popup
The ::populate-popup signal gets emitted before showing the context menu of the label. Note that only selectable labels have context menus.
Signals inherited from GtkWidget (69)
GtkWidget::accel-closures-changed
GtkWidget::button-press-event
The ::button-press-event signal will be emitted when a button (typically from a mouse) is pressed.
GtkWidget::button-release-event
The ::button-release-event signal will be emitted when a button (typically from a mouse) is released.
GtkWidget::can-activate-accel
Determines whether an accelerator that activates the signal
identified by signal_id can currently be activated.
This signal is present to allow applications and derived
widgets to override the default GtkWidget handling
for determining whether an accelerator can be activated.
GtkWidget::child-notify
The ::child-notify signal is emitted for each [child property][child-properties] that has changed on an object. The signal’s detail holds the property name.
GtkWidget::composited-changed
The ::composited-changed signal is emitted when the composited
status of widgets screen changes.
See gdk_screen_is_composited().
deprecated: 3.22
GtkWidget::configure-event
The ::configure-event signal will be emitted when the size, position or
stacking of the widget‘s window has changed.
GtkWidget::damage-event
Emitted when a redirected window belonging to widget gets drawn into.
The region/area members of the event shows what area of the redirected
drawable was drawn into.
since: 2.14
GtkWidget::delete-event
The ::delete-event signal is emitted if a user requests that
a toplevel window is closed. The default handler for this signal
destroys the window. Connecting gtk_widget_hide_on_delete() to
this signal will cause the window to be hidden instead, so that
it can later be shown again without reconstructing it.
GtkWidget::destroy
Signals that all holders of a reference to the widget should release the reference that they hold. May result in finalization of the widget if all references are released.
GtkWidget::destroy-event
The ::destroy-event signal is emitted when a GdkWindow is destroyed.
You rarely get this signal, because most widgets disconnect themselves
from their window before they destroy it, so no widget owns the
window at destroy time.
GtkWidget::direction-changed
The ::direction-changed signal is emitted when the text direction of a widget changes.
GtkWidget::drag-begin
The ::drag-begin signal is emitted on the drag source when a drag is started. A typical reason to connect to this signal is to set up a custom drag icon with e.g. gtk_drag_source_set_icon_pixbuf().
GtkWidget::drag-data-delete
The ::drag-data-delete signal is emitted on the drag source when a drag
with the action GDK_ACTION_MOVE is successfully completed. The signal
handler is responsible for deleting the data that has been dropped. What
“delete” means depends on the context of the drag operation.
GtkWidget::drag-data-get
The ::drag-data-get signal is emitted on the drag source when the drop
site requests the data which is dragged. It is the responsibility of
the signal handler to fill data with the data in the format which
is indicated by info. See gtk_selection_data_set() and gtk_selection_data_set_text().
GtkWidget::drag-data-received
The ::drag-data-received signal is emitted on the drop site when the
dragged data has been received. If the data was received in order to
determine whether the drop will be accepted, the handler is expected
to call gdk_drag_status() and not finish the drag.
If the data was received in response to a GtkWidget::drag-drop signal
(and this is the last target to be received), the handler for this
signal is expected to process the received data and then call
gtk_drag_finish(), setting the success parameter depending on
whether the data was processed successfully.
GtkWidget::drag-drop
The ::drag-drop signal is emitted on the drop site when the user drops
the data onto the widget. The signal handler must determine whether
the cursor position is in a drop zone or not. If it is not in a drop
zone, it returns FALSE and no further processing is necessary.
Otherwise, the handler returns TRUE. In this case, the handler must
ensure that gtk_drag_finish() is called to let the source know that
the drop is done. The call to gtk_drag_finish() can be done either
directly or in a GtkWidget::drag-data-received handler which gets
triggered by calling gtk_drag_get_data() to receive the data for one
or more of the supported targets.
GtkWidget::drag-end
The ::drag-end signal is emitted on the drag source when a drag is
finished. A typical reason to connect to this signal is to undo
things done in GtkWidget::drag-begin.
GtkWidget::drag-failed
The ::drag-failed signal is emitted on the drag source when a drag has
failed. The signal handler may hook custom code to handle a failed DnD
operation based on the type of error, it returns TRUE is the failure has
been already handled (not showing the default “drag operation failed”
animation), otherwise it returns FALSE.
since: 2.12
GtkWidget::drag-leave
The ::drag-leave signal is emitted on the drop site when the cursor
leaves the widget. A typical reason to connect to this signal is to
undo things done in GtkWidget::drag-motion, e.g. undo highlighting
with gtk_drag_unhighlight().
GtkWidget::drag-motion
The ::drag-motion signal is emitted on the drop site when the user
moves the cursor over the widget during a drag. The signal handler
must determine whether the cursor position is in a drop zone or not.
If it is not in a drop zone, it returns FALSE and no further processing
is necessary. Otherwise, the handler returns TRUE. In this case, the
handler is responsible for providing the necessary information for
displaying feedback to the user, by calling gdk_drag_status().
GtkWidget::draw
This signal is emitted when a widget is supposed to render itself.
The widget‘s top left corner must be painted at the origin of
the passed in context and be sized to the values returned by
gtk_widget_get_allocated_width() and gtk_widget_get_allocated_height().
since: 3.0
GtkWidget::enter-notify-event
The ::enter-notify-event will be emitted when the pointer enters
the widget‘s window.
GtkWidget::event
The GTK+ main loop will emit three signals for each GDK event delivered
to a widget: one generic ::event signal, another, more specific,
signal that matches the type of event delivered (e.g.
GtkWidget::key-press-event) and finally a generic
GtkWidget::event-after signal.
GtkWidget::event-after
After the emission of the GtkWidget::event signal and (optionally)
the second more specific signal, ::event-after will be emitted
regardless of the previous two signals handlers return values.
GtkWidget::focus
GtkWidget::focus-in-event
The ::focus-in-event signal will be emitted when the keyboard focus
enters the widget‘s window.
GtkWidget::focus-out-event
The ::focus-out-event signal will be emitted when the keyboard focus
leaves the widget‘s window.
GtkWidget::grab-broken-event
Emitted when a pointer or keyboard grab on a window belonging
to widget gets broken.
since: 2.8
GtkWidget::grab-focus
GtkWidget::grab-notify
The ::grab-notify signal is emitted when a widget becomes shadowed by a GTK+ grab (not a pointer or keyboard grab) on another widget, or when it becomes unshadowed due to a grab being removed.
GtkWidget::hide
The ::hide signal is emitted when widget is hidden, for example with gtk_widget_hide().
GtkWidget::hierarchy-changed
The ::hierarchy-changed signal is emitted when the
anchored state of a widget changes. A widget is
“anchored” when its toplevel
ancestor is a GtkWindow. This signal is emitted when
a widget changes from un-anchored to anchored or vice-versa.
GtkWidget::key-press-event
The ::key-press-event signal is emitted when a key is pressed. The signal emission will reoccur at the key-repeat rate when the key is kept pressed.
GtkWidget::key-release-event
The ::key-release-event signal is emitted when a key is released.
GtkWidget::keynav-failed
Gets emitted if keyboard navigation fails.
See gtk_widget_keynav_failed() for details.
since: 2.12
GtkWidget::leave-notify-event
The ::leave-notify-event will be emitted when the pointer leaves
the widget‘s window.
GtkWidget::map
The ::map signal is emitted when widget is going to be mapped, that is
when the widget is visible (which is controlled with
gtk_widget_set_visible()) and all its parents up to the toplevel widget
are also visible. Once the map has occurred, GtkWidget::map-event will
be emitted.
GtkWidget::map-event
The ::map-event signal will be emitted when the widget‘s window is
mapped. A window is mapped when it becomes visible on the screen.
GtkWidget::mnemonic-activate
The default handler for this signal activates widget if group_cycling
is FALSE, or just makes widget grab focus if group_cycling is TRUE.
GtkWidget::motion-notify-event
The ::motion-notify-event signal is emitted when the pointer moves
over the widget’s GdkWindow.
GtkWidget::move-focus
GtkWidget::parent-set
The ::parent-set signal is emitted when a new parent has been set on a widget.
GtkWidget::popup-menu
This signal gets emitted whenever a widget should pop up a context
menu. This usually happens through the standard key binding mechanism;
by pressing a certain key while a widget is focused, the user can cause
the widget to pop up a menu. For example, the GtkEntry widget creates
a menu with clipboard commands. See the
[Popup Menu Migration Checklist][checklist-popup-menu]
for an example of how to use this signal.
GtkWidget::property-notify-event
The ::property-notify-event signal will be emitted when a property on
the widget‘s window has been changed or deleted.
GtkWidget::proximity-in-event
To receive this signal the GdkWindow associated to the widget needs
to enable the #GDK_PROXIMITY_IN_MASK mask.
GtkWidget::proximity-out-event
To receive this signal the GdkWindow associated to the widget needs
to enable the #GDK_PROXIMITY_OUT_MASK mask.
GtkWidget::query-tooltip
Emitted when GtkWidget:has-tooltip is TRUE and the hover timeout
has expired with the cursor hovering “above” widget; or emitted when widget got
focus in keyboard mode.
since: 2.12
GtkWidget::realize
The ::realize signal is emitted when widget is associated with a
GdkWindow, which means that gtk_widget_realize() has been called or the
widget has been mapped (that is, it is going to be drawn).
GtkWidget::screen-changed
The ::screen-changed signal gets emitted when the screen of a widget has changed.
GtkWidget::scroll-event
The ::scroll-event signal is emitted when a button in the 4 to 7 range is pressed. Wheel mice are usually configured to generate button press events for buttons 4 and 5 when the wheel is turned.
GtkWidget::selection-clear-event
The ::selection-clear-event signal will be emitted when the
the widget‘s window has lost ownership of a selection.
GtkWidget::selection-get
GtkWidget::selection-notify-event
GtkWidget::selection-received
GtkWidget::selection-request-event
The ::selection-request-event signal will be emitted when
another client requests ownership of the selection owned by
the widget‘s window.
GtkWidget::show
The ::show signal is emitted when widget is shown, for example with gtk_widget_show().
GtkWidget::show-help
GtkWidget::size-allocate
GtkWidget::state-changed
The ::state-changed signal is emitted when the widget state changes. See gtk_widget_get_state().
deprecated: 3.0
GtkWidget::state-flags-changed
The ::state-flags-changed signal is emitted when the widget state changes, see gtk_widget_get_state_flags().
since: 3.0
GtkWidget::style-set
The ::style-set signal is emitted when a new style has been set
on a widget. Note that style-modifying functions like
gtk_widget_modify_base() also cause this signal to be emitted.
deprecated: 3.0
GtkWidget::style-updated
The ::style-updated signal is a convenience signal that is emitted when the
GtkStyleContext::changed signal is emitted on the widget‘s associated
GtkStyleContext as returned by gtk_widget_get_style_context().
since: 3.0
GtkWidget::touch-event
GtkWidget::unmap
The ::unmap signal is emitted when widget is going to be unmapped, which
means that either it or any of its parents up to the toplevel widget have
been set as hidden.
GtkWidget::unmap-event
The ::unmap-event signal will be emitted when the widget‘s window is
unmapped. A window is unmapped when it becomes invisible on the screen.
GtkWidget::unrealize
The ::unrealize signal is emitted when the GdkWindow associated with
widget is destroyed, which means that gtk_widget_unrealize() has been
called or the widget has been unmapped (that is, it is going to be hidden).
GtkWidget::visibility-notify-event
The ::visibility-notify-event will be emitted when the widget‘s
window is obscured or unobscured.
deprecated: 3.12
GtkWidget::window-state-event
The ::window-state-event will be emitted when the state of the
toplevel window associated to the widget changes.
Signals inherited from GObject (1)
GObject::notify
The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.
Class structure
struct GtkLabelClass {
GtkMiscClass parent_class;
void (* move_cursor) (
GtkLabel* label,
GtkMovementStep step,
gint count,
gboolean extend_selection
);
void (* copy_clipboard) (
GtkLabel* label
);
void (* populate_popup) (
GtkLabel* label,
GtkMenu* menu
);
gboolean (* activate_link) (
GtkLabel* label,
const gchar* uri
);
void (* _gtk_reserved1) (
void
);
void (* _gtk_reserved2) (
void
);
void (* _gtk_reserved3) (
void
);
void (* _gtk_reserved4) (
void
);
void (* _gtk_reserved5) (
void
);
void (* _gtk_reserved6) (
void
);
void (* _gtk_reserved7) (
void
);
void (* _gtk_reserved8) (
void
);
}No description available.
Class members
parent_class: GtkMiscClassNo description available.
move_cursor: void (* move_cursor) ( GtkLabel* label, GtkMovementStep step, gint count, gboolean extend_selection )No description available.
copy_clipboard: void (* copy_clipboard) ( GtkLabel* label )No description available.
populate_popup: void (* populate_popup) ( GtkLabel* label, GtkMenu* menu )No description available.
activate_link: gboolean (* activate_link) ( GtkLabel* label, const gchar* uri )No description available.
_gtk_reserved1: void (* _gtk_reserved1) ( void )No description available.
_gtk_reserved2: void (* _gtk_reserved2) ( void )No description available.
_gtk_reserved3: void (* _gtk_reserved3) ( void )No description available.
_gtk_reserved4: void (* _gtk_reserved4) ( void )No description available.
_gtk_reserved5: void (* _gtk_reserved5) ( void )No description available.
_gtk_reserved6: void (* _gtk_reserved6) ( void )No description available.
_gtk_reserved7: void (* _gtk_reserved7) ( void )No description available.
_gtk_reserved8: void (* _gtk_reserved8) ( void )No description available.