Gradient

GtkGradient is a boxed type that represents a gradient. It is the result of parsing a [gradient expression][gtkcssprovider-gradients]. To obtain the gradient represented by a GtkGradient, it has to be resolved with gtk_gradient_resolve(), which replaces all symbolic color references by the colors they refer to (in a given context) and constructs a #cairo_pattern_t value.

It is not normally necessary to deal directly with #GtkGradients, since they are mostly used behind the scenes by #GtkStyleContext and #GtkCssProvider.

#GtkGradient is deprecated. It was used internally by GTK’s CSS engine to represent gradients. As its handling is not conforming to modern web standards, it is not used anymore. If you want to use gradients in your own code, please use Cairo directly.

class Gradient {

protected

GtkGradient* gtkGradient;

protected

bool ownedRef;

GtkGradient* getGradientStruct();

void* getStruct();

this(GtkGradient* gtkGradient, bool ownedRef);

~this();

static GType getType();

this(double x0, double y0, double x1, double y1);

this(double x0, double y0, double radius0, double x1, double y1, double radius1);

void addColorStop(double offset, SymbolicColor color);

Gradient doref();

bool resolve(StyleProperties props, Pattern resolvedGradient);

Pattern resolveForContext(StyleContext context);

string toString();

void unref();

}

Constructors

this this(GtkGradient* gtkGradient, bool ownedRef): Sets our main struct and passes it to the parent class.
this this(double x0, double y0, double x1, double y1): Creates a new linear gradient along the line defined by (x0, y0) and (x1, y1). Before using the gradient a number of stop colors must be added through gtk_gradient_add_color_stop().
this this(double x0, double y0, double radius0, double x1, double y1, double radius1): Creates a new radial gradient along the two circles defined by (x0, y0, radius0) and (x1, y1, radius1). Before using the gradient a number of stop colors must be added through gtk_gradient_add_color_stop().

Destructor

~this ~this(): Undocumented in source.

Members

Functions

addColorStop void addColorStop(double offset, SymbolicColor color): Adds a stop color to @gradient.
doref Gradient doref(): Increases the reference count of @gradient.
getGradientStruct GtkGradient* getGradientStruct(): Get the main Gtk struct
getStruct void* getStruct(): the main Gtk struct as a void*
resolve bool resolve(StyleProperties props, Pattern resolvedGradient): If @gradient is resolvable, @resolved_gradient will be filled in with the resolved gradient as a cairo_pattern_t, and %TRUE will be returned. Generally, if @gradient can’t be resolved, it is due to it being defined on top of a named color that doesn't exist in @props.
resolveForContext Pattern resolveForContext(StyleContext context)
toString string toString(): Creates a string representation for @gradient that is suitable for using in GTK CSS files.
unref void unref(): Decreases the reference count of @gradient, freeing its memory if the reference count reaches 0.

Static functions

getType GType getType()

Variables

gtkGradient GtkGradient* gtkGradient;: the main Gtk struct
ownedRef bool ownedRef;: Undocumented in source.