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scale: Replace format-value signal

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There is no reason for this to be a signal, since multiple handlers
don't make sense anyway. It was also broken because the scale needs to
know when a signal handler is added so it can update the value
representation.

Replace the signal with a set_format_value_func function which allows us
to do that.

Fixes #113
This commit is contained in:
Timm Bäder 2019-08-09 13:32:24 +02:00
parent ebc0d3760f
commit ea5fc348fa
4 changed files with 80 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
demos/widget-factory/widget-factory.c
View File

@ -1603,14 +1603,14 @@ reset_icon_size (GtkWidget *iv)
gtk_widget_queue_resize (iv);
}
static gchar *
scale_format_value_blank (GtkScale *scale, gdouble value)
static char *
scale_format_value_blank (GtkScale *scale, double value, gpointer user_data)
{
return g_strdup (" ");
}
static gchar *
scale_format_value (GtkScale *scale, gdouble value)
static char *
scale_format_value (GtkScale *scale, double value, gpointer user_data)
{
return g_strdup_printf ("%0.*f", 1, value);
}
@ -1724,8 +1724,6 @@ activate (GApplication *app)
gtk_builder_add_callback_symbol (builder, "increase_icon_size", (GCallback)increase_icon_size);
gtk_builder_add_callback_symbol (builder, "decrease_icon_size", (GCallback)decrease_icon_size);
gtk_builder_add_callback_symbol (builder, "reset_icon_size", (GCallback)reset_icon_size);
gtk_builder_add_callback_symbol (builder, "scale_format_value", (GCallback)scale_format_value);
gtk_builder_add_callback_symbol (builder, "scale_format_value_blank", (GCallback)scale_format_value_blank);
gtk_builder_add_callback_symbol (builder, "osd_frame_pressed", (GCallback)osd_frame_pressed);
gtk_builder_connect_signals (builder, NULL);
@ -1945,6 +1943,12 @@ activate (GApplication *app)
widget = (GtkWidget *)gtk_builder_get_object (builder, "extra_info_entry");
g_timeout_add (100, (GSourceFunc)pulse_it, widget);
widget = (GtkWidget *)gtk_builder_get_object (builder, "scale3");
gtk_scale_set_format_value_func (GTK_SCALE (widget), scale_format_value, NULL);
widget = (GtkWidget *)gtk_builder_get_object (builder, "scale4");
gtk_scale_set_format_value_func (GTK_SCALE (widget), scale_format_value_blank, NULL);
widget = (GtkWidget *)gtk_builder_get_object (builder, "box_for_context");
model = (GMenuModel *)gtk_builder_get_object (builder, "new_style_context_menu_model");
set_up_context_popover (widget, model);

2
demos/widget-factory/widget-factory.ui
View File

@ -1019,7 +1019,6 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
<property name="fill-level">75</property>
<property name="digits">-1</property>
<property name="halign">end</property>
<signal name="format-value" handler="scale_format_value"/>
</object>
</child>
<child>
@ -1033,7 +1032,6 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
<property name="fill-level">75</property>
<property name="digits">-1</property>
<property name="halign">start</property>
<signal name="format-value" handler="scale_format_value_blank"/>
</object>
</child>
</object>

108
gtk/gtkscale.c
View File

@ -148,6 +148,9 @@ struct _GtkScalePrivate
gint digits;
GtkScaleFormatValueFunc format_value_func;
gpointer format_value_func_user_data;
guint draw_value : 1;
guint value_pos : 2;
};
@ -172,13 +175,8 @@ enum {
LAST_PROP
};
enum {
FORMAT_VALUE,
LAST_SIGNAL
};
static GParamSpec *properties[LAST_PROP];
static guint signals[LAST_SIGNAL];
static void gtk_scale_set_property (GObject *object,
guint prop_id,
@ -264,7 +262,6 @@ update_label_request (GtkScale *scale)
size = MAX (size, min);
g_free (text);
text = gtk_scale_format_value (scale, highest_value);
gtk_label_set_label (GTK_LABEL (priv->value_widget), text);
@ -665,42 +662,6 @@ gtk_scale_class_init (GtkScaleClass *class)
class->get_layout_offsets = gtk_scale_real_get_layout_offsets;
/**
* GtkScale::format-value:
* @scale: the object which received the signal
* @value: the value to format
*
* Signal which allows you to change how the scale value is displayed.
* Connect a signal handler which returns an allocated string representing
* @value. That string will then be used to display the scale's value.
*
* If no user-provided handlers are installed, the value will be displayed on
* its own, rounded according to the value of the #GtkScale:digits property.
*
* Here's an example signal handler which displays a value 1.0 as
* with "-->1.0<--".
* |[<!-- language="C" -->
* static gchar*
* format_value_callback (GtkScale *scale,
* gdouble value)
* {
* return g_strdup_printf ("-->\%0.*g<--",
* gtk_scale_get_digits (scale), value);
* }
* ]|
*
* Returns: allocated string representing @value
*/
signals[FORMAT_VALUE] =
g_signal_new (I_("format-value"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkScaleClass, format_value),
_gtk_single_string_accumulator, NULL,
_gtk_marshal_STRING__DOUBLE,
G_TYPE_STRING, 1,
G_TYPE_DOUBLE);
properties[PROP_DIGITS] =
g_param_spec_int ("digits",
P_("Digits"),
@ -1023,7 +984,7 @@ gtk_scale_new_with_range (GtkOrientation orientation,
*
* Note that rounding to a small number of digits can interfere with
* the smooth autoscrolling that is built into #GtkScale. As an alternative,
* you can use the #GtkScale::format-value signal to format the displayed
* you can use gtk_scale_set_format_value_func() to format the displayed
* value yourself.
*/
void
@ -1560,26 +1521,19 @@ weed_out_neg_zero (gchar *str,
return str;
}
/*
* Emits #GtkScale:format-value signal to format the value;
* if no user signal handlers, falls back to a default format.
*
* Returns: formatted value
*/
static gchar *
static char *
gtk_scale_format_value (GtkScale *scale,
gdouble value)
double value)
{
gchar *fmt = NULL;
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
g_signal_emit (scale, signals[FORMAT_VALUE], 0, value, &fmt);
if (fmt)
return fmt;
if (priv->format_value_func)
{
return priv->format_value_func (scale, value, priv->format_value_func_user_data);
}
else
{
fmt = g_strdup_printf ("%0.*f", priv->digits, value);
char *fmt = g_strdup_printf ("%0.*f", priv->digits, value);
return weed_out_neg_zero (fmt, priv->digits);
}
}
@ -2075,3 +2029,43 @@ gtk_scale_buildable_custom_finished (GtkBuildable *buildable,
}
}
/**
* gtk_scale_set_format_value_func:
* @scale: a #GtkScale
* @func: (nullable): function that formats the value
* @user_data: (nullable): user data to pass to @func
*
* @func allows you to change how the scale value is displayed. The given
* function will return an allocated string representing @value.
* That string will then be used to display the scale's value.
*
* If #NULL is passed as @func, the value will be displayed on
* its own, rounded according to the value of the #GtkScale:digits property.
*/
void
gtk_scale_set_format_value_func (GtkScale *scale,
GtkScaleFormatValueFunc func,
gpointer user_data)
{
GtkScalePrivate *priv = gtk_scale_get_instance_private (scale);
GtkAdjustment *adjustment;
char *text;
g_return_if_fail (GTK_IS_SCALE (scale));
priv->format_value_func = func;
priv->format_value_func_user_data = user_data;
if (!priv->value_widget)
return;
update_label_request (scale);
adjustment = gtk_range_get_adjustment (GTK_RANGE (scale));
text = gtk_scale_format_value (scale,
gtk_adjustment_get_value (adjustment));
gtk_label_set_label (GTK_LABEL (priv->value_widget), text);
g_free (text);
}

22
gtk/gtkscale.h
View File

@ -55,9 +55,6 @@ struct _GtkScaleClass
{
GtkRangeClass parent_class;
gchar* (* format_value) (GtkScale *scale,
gdouble value);
void (* get_layout_offsets) (GtkScale *scale,
gint *x,
gint *y);
@ -67,6 +64,21 @@ struct _GtkScaleClass
gpointer padding[8];
};
/**
* GtkScaleFormatValueFunc:
* @scale: The #GtkScale
* @value: The numeric value to format
* @user_data: (closure): user data
*
* Returns: (not nullable): A newly allocated string describing a textual representation
* of the given numerical value.
*/
typedef char * (*GtkScaleFormatValueFunc) (GtkScale *scale,
double value,
gpointer user_data);
GDK_AVAILABLE_IN_ALL
GType gtk_scale_get_type (void) G_GNUC_CONST;
GDK_AVAILABLE_IN_ALL
@ -113,6 +125,10 @@ void gtk_scale_add_mark (GtkScale *scale,
GDK_AVAILABLE_IN_ALL
void gtk_scale_clear_marks (GtkScale *scale);
GDK_AVAILABLE_IN_ALL
void gtk_scale_set_format_value_func (GtkScale *scale,
GtkScaleFormatValueFunc func,
gpointer user_data);
G_END_DECLS