Gtk.Svg
Description: Reference for Gtk.Svg

### Class

# GtkSvg

since: 4.22

#### Description [src]

    final class Gtk.Svg : GObject.Object
      implements Gdk.Paintable, Gtk.SymbolicPaintable {
      /* No available fields */
    }

A paintable implementation that renders SVG, with animations.

`GtkSvg` objects are created by parsing a subset of SVG, including SVG animations.

`GtkSvg` fills or strokes paths with symbolic or fixed colors. It can have multiple states, and paths can be included in a subset of the states. States can have animations, and the transition between different states can also be animated.

To show a static SVG image, it is enough to load the the SVG and use it like any other paintable.

To play an SVG animation, use `gtk_svg_set_frame_clock()` to connect the paintable to a frame clock, and call `gtk_svg_play()` after loading the SVG. The animation can be paused using `gtk_svg_pause()`.

To set the current state, use `gtk_svg_set_state()`.

## Error handling

Loading an SVG into `GtkSvg` will always produce a (possibly empty) paintable. GTK will drop things that it can’t handle and try to make sense of the rest.

To track errors during parsing or rendering, connect to the `GtkSvg::error` signal.

For parsing errors in the `GTK_SVG_ERROR` domain, the functions `gtk_svg_error_get_start()`, `gtk_svg_error_get_end()`, `gtk_svg_error_get_element()` and `gtk_svg_error_get_attribute()` can be used to obtain information about where the error occurred.

## The supported subset of SVG

The paintable supports much of SVG 2, with some exceptions.

Among the graphical elements, `<textPath>` and `<foreignObject>` are not supported.

Among the structural elements, `<a>` and `<view>` are not supported.

In the `<filter>` element, the following primitives are not supported: feConvolveMatrix, feDiffuseLighting, feMorphology, feSpecularLighting and feTurbulence.

Support for the `mask` attribute is limited to just a url referring to the `<mask>` element by ID.

In animation elements, the parsing of `begin` and `end` attributes is limited, and the `min` and `max` attributes are not supported.

Lastly, there is only minimal CSS support (the style attribute, but not `<style>`), and no interactivity.

## SVG Extensions

The paintable supports a number of custom attributes that offer a convenient way to define states, transitions and animations. For example,

    <circle cx='5' cy='5' r='5'
            gpa:states='0 1'
            gpa:animation-type='automatic'
            gpa:animation-direction='segment'
            gpa:animation-duration='600ms'/>

defines the circle to be shown in states 0 and 1, and animates a segment of the circle.

Note that the generated animations are implemented using standard SVG attributes (`visibility`, `stroke-dasharray,`stroke-dashoffset`,`pathLength`and`filter`). Setting these attributes in your SVG is therefore going to interfere with generated animations.

To connect general SVG animations to the states of the paintable, use the custom `gpa:states(...)` condition in the `begin` and `end` attributes of SVG animation elements. For example,

    <animate href='path1'
             attributeName='fill'
             begin='gpa:states(0).begin'
             dur='300ms'
             fill='freeze'
             from='black'
             to='magenta'/>

will make the fill color of path1 transition from black to magenta when the renderer enters state 0.

The `gpa:states(...)` condition triggers for upcoming state changes as well, to support fade-out transitions. For example,

    <animate href='path1'
             attributeName='opacity'
             begin='gpa:states(0).end -300ms'
             dur='300ms'
             fill='freeze'
             from='1'
             to='0'/>

will start a fade-out of path1 300ms before state 0 ends.

A variant of the `gpa:states(...)` condition allows specifying both before and after states:

    <animate href='path1'
             attributeName='opacity'
             begin='gpa:states(0, 1 2)'
             dur='300ms'
             fill='freeze'
             from='1'
             to='0'/>

will start the animation when the state changes from 0 to 1 or from 0 to 2, but not when it changes from 0 to 3.

In addition to the `gpa:fill` and `gpa:stroke` attributes, symbolic colors can also be specified as a custom paint server reference, like this: `url(#gpa:warning)`. This works in `fill` and `stroke` attributes, but also when specifying colors in SVG animation attributes like `to` or `values`.

Note that the SVG syntax allows for a fallback RGB color to be specified after the url, for compatibility with other SVG consumers:

    fill='url(#gpa:warning) orange'

In contrast to SVG 1.1 and 2.0, we allow the `transform` attribute to be animated with `<animate>`.

Available since: 4.22

#### Hierarchy

#### Ancestors

- GObject

#### Implements

- GdkPaintable
- GtkSymbolicPaintable

#### Constructors

###### gtk_svg_new

Creates a new, empty SVG paintable.

since: 4.22

###### gtk_svg_new_from_bytes

Parses the SVG data in `bytes` and creates a paintable.

since: 4.22

###### gtk_svg_new_from_resource

Parses the SVG data in the resource and creates a paintable.

since: 4.22

#### Instance methods

###### gtk_svg_get_features

Returns the currently enabled features.

since: 4.22

###### gtk_svg_get_state

Gets the current state of the paintable.

since: 4.22

###### gtk_svg_get_state_names

Returns a `NULL`-terminated array of state names, if available.

since: 4.22

###### gtk_svg_get_weight

Gets the value of the weight property.

since: 4.22

###### gtk_svg_load_from_bytes

Loads SVG content into an existing SVG paintable.

since: 4.22

###### gtk_svg_load_from_resource

Loads SVG content into an existing SVG paintable.

since: 4.22

###### gtk_svg_pause

Stop any playing animations and state transitions.

since: 4.22

###### gtk_svg_play

Start playing animations and state transitions.

since: 4.22

###### gtk_svg_serialize

Serializes the content of the renderer as SVG.

since: 4.22

###### gtk_svg_set_features

Enables or disables features of the SVG paintable.

since: 4.22

###### gtk_svg_set_frame_clock

Sets a frame clock.

since: 4.22

###### gtk_svg_set_state

Sets the state of the paintable.

since: 4.22

###### gtk_svg_set_weight

Sets the weight that is used when rendering.

since: 4.22

###### gtk_svg_write_to_file

Serializes the paintable, and saves the result to a file.

since: 4.22

##### Methods inherited from GObject (43)

Please see GObject for a full list of methods.

##### Methods inherited from GdkPaintable (9)

###### gdk_paintable_compute_concrete_size

Compute a concrete size for the `GdkPaintable`.

###### gdk_paintable_get_current_image

Gets an immutable paintable for the current contents displayed by `paintable`.

###### gdk_paintable_get_flags

Get flags for the paintable.

###### gdk_paintable_get_intrinsic_aspect_ratio

Gets the preferred aspect ratio the `paintable` would like to be displayed at.

###### gdk_paintable_get_intrinsic_height

Gets the preferred height the `paintable` would like to be displayed at.

###### gdk_paintable_get_intrinsic_width

Gets the preferred width the `paintable` would like to be displayed at.

###### gdk_paintable_invalidate_contents

Called by implementations of `GdkPaintable` to invalidate their contents.

###### gdk_paintable_invalidate_size

Called by implementations of `GdkPaintable` to invalidate their size.

###### gdk_paintable_snapshot

Snapshots the given paintable with the given `width` and `height`.

##### Methods inherited from GtkSymbolicPaintable (2)

###### gtk_symbolic_paintable_snapshot_symbolic

Snapshots the paintable with the given colors.

since: 4.6

###### gtk_symbolic_paintable_snapshot_with_weight

Snapshots the paintable with the given colors and weight.

since: 4.22

#### Properties

###### Gtk.Svg:features

Enabled features for this paintable.

since: 4.22

###### Gtk.Svg:playing

Whether the paintable is currently animating its content.

since: 4.22

###### Gtk.Svg:resource

Resource to load SVG data from.

since: 4.22

###### Gtk.Svg:state

The current state of the renderer.

since: 4.22

###### Gtk.Svg:weight

If not set to -1, this value overrides the weight used when rendering the paintable.

since: 4.22

#### Signals

###### Gtk.Svg::error

Signals that an error occurred.

since: 4.22

##### 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.

##### Signals inherited from GdkPaintable (2)

###### GdkPaintable::invalidate-contents

Emitted when the contents of the `paintable` change.

###### GdkPaintable::invalidate-size

Emitted when the intrinsic size of the `paintable` changes.

#### Class structure

    struct GtkSvgClass {
      GObjectClass parent_class;

    }

No description available.

###### Class members

`parent_class: GObjectClass`

  No description available.