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Expose view settings as GObject properties

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This commit is contained in:
Přemysl Eric Janouch 2021-11-14 02:47:42 +01:00
parent 1f0d6b24d8
commit c905f64d12
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 66 additions and 25 deletions
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91
fastiv-view.c
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@ -30,6 +30,40 @@ struct _FastivView {
G_DEFINE_TYPE(FastivView, fastiv_view, GTK_TYPE_WIDGET)
enum {
PROP_SCALE = 1,
PROP_SCALE_TO_FIT,
N_PROPERTIES
};
static GParamSpec *view_properties[N_PROPERTIES];
static void
fastiv_view_finalize(GObject *gobject)
{
FastivView *self = FASTIV_VIEW(gobject);
cairo_surface_destroy(self->surface);
G_OBJECT_CLASS(fastiv_view_parent_class)->finalize(gobject);
}
static void
fastiv_view_get_property(
GObject *object, guint property_id, GValue *value, GParamSpec *pspec)
{
FastivView *self = FASTIV_VIEW(object);
switch (property_id) {
case PROP_SCALE:
g_value_set_double(value, self->scale);
break;
case PROP_SCALE_TO_FIT:
g_value_set_boolean(value, self->scale_to_fit);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
}
}
static void
get_surface_dimensions(FastivView *self, double *width, double *height)
{
@ -63,15 +97,6 @@ get_display_dimensions(FastivView *self, int *width, int *height)
*height = ceil(h * self->scale);
}
static void
fastiv_view_finalize(GObject *gobject)
{
FastivView *self = FASTIV_VIEW(gobject);
cairo_surface_destroy(self->surface);
G_OBJECT_CLASS(fastiv_view_parent_class)->finalize(gobject);
}
static void
fastiv_view_get_preferred_height(
GtkWidget *widget, gint *minimum, gint *natural)
@ -123,6 +148,7 @@ fastiv_view_size_allocate(GtkWidget *widget, GtkAllocation *allocation)
self->scale = allocation->width / w;
if (ceil(h * self->scale) > allocation->height)
self->scale = allocation->height / h;
g_object_notify_by_pspec(G_OBJECT(widget), view_properties[PROP_SCALE]);
}
static void
@ -218,13 +244,25 @@ fastiv_view_draw(GtkWidget *widget, cairo_t *cr)
#define SCALE_STEP 1.4
static gboolean
on_scale_updated(FastivView *self)
set_scale_to_fit(FastivView *self, bool scale_to_fit)
{
self->scale_to_fit = false;
self->scale_to_fit = scale_to_fit;
gtk_widget_queue_resize(GTK_WIDGET(self));
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_SCALE_TO_FIT]);
return TRUE;
}
static gboolean
set_scale(FastivView *self, double scale)
{
self->scale = scale;
g_object_notify_by_pspec(
G_OBJECT(self), view_properties[PROP_SCALE]);
return set_scale_to_fit(self, false);
}
static gboolean
fastiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event)
{
@ -234,11 +272,9 @@ fastiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event)
switch (event->direction) {
case GDK_SCROLL_UP:
self->scale *= SCALE_STEP;
return on_scale_updated(self);
return set_scale(self, self->scale * SCALE_STEP);
case GDK_SCROLL_DOWN:
self->scale /= SCALE_STEP;
return on_scale_updated(self);
return set_scale(self, self->scale / SCALE_STEP);
default:
return FALSE;
}
@ -253,17 +289,14 @@ fastiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
switch (event->keyval) {
case GDK_KEY_1:
self->scale = 1;
return on_scale_updated(self);
return set_scale(self, 1.0);
case GDK_KEY_plus:
self->scale *= SCALE_STEP;
return on_scale_updated(self);
return set_scale(self, self->scale * SCALE_STEP);
case GDK_KEY_minus:
self->scale /= SCALE_STEP;
return on_scale_updated(self);
return set_scale(self, self->scale / SCALE_STEP);
case GDK_KEY_f:
self->scale_to_fit = !self->scale_to_fit;
gtk_widget_queue_resize(GTK_WIDGET(self));
return set_scale_to_fit(self, !self->scale_to_fit);
}
return FALSE;
}
@ -273,6 +306,16 @@ fastiv_view_class_init(FastivViewClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS(klass);
object_class->finalize = fastiv_view_finalize;
object_class->get_property = fastiv_view_get_property;
view_properties[PROP_SCALE] = g_param_spec_double(
"scale", "Scale", "Zoom level",
0, G_MAXDOUBLE, 1.0, G_PARAM_READABLE);
view_properties[PROP_SCALE_TO_FIT] = g_param_spec_boolean(
"scale-to-fit", "Scale to fit", "Scale images doewn to fit the window",
TRUE, G_PARAM_READABLE);
g_object_class_install_properties(
object_class, N_PROPERTIES, view_properties);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
widget_class->get_preferred_height = fastiv_view_get_preferred_height;
@ -309,8 +352,6 @@ fastiv_view_open(FastivView *self, const gchar *path, GError **error)
cairo_surface_destroy(self->surface);
self->surface = surface;
self->scale = 1.0;
self->scale_to_fit = true;
gtk_widget_queue_resize(GTK_WIDGET(self));
set_scale_to_fit(self, true);
return TRUE;
}