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Functions
Properties
GtkAdjustment * | adjustment | Read / Write |
gdouble | climb-rate | Read / Write |
guint | digits | Read / Write |
gboolean | numeric | Read / Write |
gboolean | snap-to-ticks | Read / Write |
GtkSpinButtonUpdatePolicy | update-policy | Read / Write |
gdouble | value | Read / Write |
gboolean | wrap | Read / Write |
Types and Values
struct | GtkSpinButton |
enum | GtkSpinButtonUpdatePolicy |
enum | GtkSpinType |
#define | gtk_spin_button_get_value_as_float |
#define | GTK_INPUT_ERROR |
Object Hierarchy
GObject ╰── GInitiallyUnowned ╰── GtkObject ╰── GtkWidget ╰── GtkEntry ╰── GtkSpinButton
Implemented Interfaces
GtkSpinButton implements AtkImplementorIface, GtkBuildable, GtkEditable and GtkCellEditable.
Description
A GtkSpinButton is an ideal way to allow the user to set the value of some attribute. Rather than having to directly type a number into a GtkEntry, GtkSpinButton allows the user to click on one of two arrows to increment or decrement the displayed value. A value can still be typed in, with the bonus that it can be checked to ensure it is in a given range.
The main properties of a GtkSpinButton are through a GtkAdjustment. See the GtkAdjustment section for more details about an adjustment's properties.
Example 12. Using a GtkSpinButton to get an integer.
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/* Provides a function to retrieve an integer value from a GtkSpinButton * and creates a spin button to model percentage values. */ gint grab_int_value (GtkSpinButton *a_spinner, gpointer user_data) { return gtk_spin_button_get_value_as_int (a_spinner); } void create_integer_spin_button (void) { GtkWidget *window, *spinner; GtkAdjustment *spinner_adj; spinner_adj = (GtkAdjustment *) gtk_adjustment_new (50.0, 0.0, 100.0, 1.0, 5.0, 5.0); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_container_set_border_width (GTK_CONTAINER (window), 5); /* creates the spinner, with no decimal places */ spinner = gtk_spin_button_new (spinner_adj, 1.0, 0); gtk_container_add (GTK_CONTAINER (window), spinner); gtk_widget_show_all (window); return; } |
Example 13. Using a GtkSpinButton to get a floating point value.
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/* Provides a function to retrieve a floating point value from a * GtkSpinButton, and creates a high precision spin button. */ gfloat grab_int_value (GtkSpinButton *a_spinner, gpointer user_data) { return gtk_spin_button_get_value (a_spinner); } void create_floating_spin_button (void) { GtkWidget *window, *spinner; GtkAdjustment *spinner_adj; spinner_adj = (GtkAdjustment *) gtk_adjustment_new (2.500, 0.0, 5.0, 0.001, 0.1, 0.1); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_container_set_border_width (GTK_CONTAINER (window), 5); /* creates the spinner, with three decimal places */ spinner = gtk_spin_button_new (spinner_adj, 0.001, 3); gtk_container_add (GTK_CONTAINER (window), spinner); gtk_widget_show_all (window); return; } |
Functions
gtk_spin_button_configure ()
void gtk_spin_button_configure (GtkSpinButton *spin_button
,GtkAdjustment *adjustment
,gdouble climb_rate
,guint digits
);
Changes the properties of an existing spin button. The adjustment, climb rate, and number of decimal places are all changed accordingly, after this function call.
gtk_spin_button_new ()
GtkWidget * gtk_spin_button_new (GtkAdjustment *adjustment
,gdouble climb_rate
,guint digits
);
Creates a new GtkSpinButton.
Parameters
adjustment |
the GtkAdjustment object that this spin button should use. |
|
climb_rate |
specifies how much the spin button changes when an arrow is clicked on. |
|
digits |
the number of decimal places to display. |
gtk_spin_button_new_with_range ()
GtkWidget * gtk_spin_button_new_with_range (gdouble min
,gdouble max
,gdouble step
);
This is a convenience constructor that allows creation of a numeric
GtkSpinButton without manually creating an adjustment. The value is
initially set to the minimum value and a page increment of 10 * step
is the default. The precision of the spin button is equivalent to the
precision of step
.
Note that the way in which the precision is derived works best if step
is a power of ten. If the resulting precision is not suitable for your
needs, use gtk_spin_button_set_digits()
to correct it.
gtk_spin_button_set_adjustment ()
void gtk_spin_button_set_adjustment (GtkSpinButton *spin_button
,GtkAdjustment *adjustment
);
Replaces the GtkAdjustment associated with spin_button
.
gtk_spin_button_get_adjustment ()
GtkAdjustment *
gtk_spin_button_get_adjustment (GtkSpinButton *spin_button
);
Get the adjustment associated with a GtkSpinButton
gtk_spin_button_set_digits ()
void gtk_spin_button_set_digits (GtkSpinButton *spin_button
,guint digits
);
Set the precision to be displayed by spin_button
. Up to 20 digit precision
is allowed.
gtk_spin_button_set_increments ()
void gtk_spin_button_set_increments (GtkSpinButton *spin_button
,gdouble step
,gdouble page
);
Sets the step and page increments for spin_button. This affects how quickly the value changes when the spin button's arrows are activated.
gtk_spin_button_set_range ()
void gtk_spin_button_set_range (GtkSpinButton *spin_button
,gdouble min
,gdouble max
);
Sets the minimum and maximum allowable values for spin_button
gtk_spin_button_get_value_as_int ()
gint
gtk_spin_button_get_value_as_int (GtkSpinButton *spin_button
);
Get the value spin_button
represented as an integer.
gtk_spin_button_set_value ()
void gtk_spin_button_set_value (GtkSpinButton *spin_button
,gdouble value
);
Set the value of spin_button
.
gtk_spin_button_set_update_policy ()
void gtk_spin_button_set_update_policy (GtkSpinButton *spin_button
,GtkSpinButtonUpdatePolicy policy
);
Sets the update behavior of a spin button. This determines whether the spin button is always updated or only when a valid value is set.
gtk_spin_button_set_numeric ()
void gtk_spin_button_set_numeric (GtkSpinButton *spin_button
,gboolean numeric
);
Sets the flag that determines if non-numeric text can be typed into the spin button.
gtk_spin_button_spin ()
void gtk_spin_button_spin (GtkSpinButton *spin_button
,GtkSpinType direction
,gdouble increment
);
Increment or decrement a spin button's value in a specified direction by a specified amount.
Parameters
spin_button |
||
direction |
a GtkSpinType indicating the direction to spin. |
|
increment |
step increment to apply in the specified direction. |
gtk_spin_button_set_wrap ()
void gtk_spin_button_set_wrap (GtkSpinButton *spin_button
,gboolean wrap
);
Sets the flag that determines if a spin button value wraps around to the opposite limit when the upper or lower limit of the range is exceeded.
gtk_spin_button_set_snap_to_ticks ()
void gtk_spin_button_set_snap_to_ticks (GtkSpinButton *spin_button
,gboolean snap_to_ticks
);
Sets the policy as to whether values are corrected to the nearest step increment when a spin button is activated after providing an invalid value.
gtk_spin_button_update ()
void
gtk_spin_button_update (GtkSpinButton *spin_button
);
Manually force an update of the spin button.
gtk_spin_button_get_digits ()
guint
gtk_spin_button_get_digits (GtkSpinButton *spin_button
);
Fetches the precision of spin_button
. See gtk_spin_button_set_digits()
.
gtk_spin_button_get_increments ()
void gtk_spin_button_get_increments (GtkSpinButton *spin_button
,gdouble *step
,gdouble *page
);
Gets the current step and page the increments used by spin_button
. See
gtk_spin_button_set_increments()
.
gtk_spin_button_get_numeric ()
gboolean
gtk_spin_button_get_numeric (GtkSpinButton *spin_button
);
Returns whether non-numeric text can be typed into the spin button.
See gtk_spin_button_set_numeric()
.
gtk_spin_button_get_range ()
void gtk_spin_button_get_range (GtkSpinButton *spin_button
,gdouble *min
,gdouble *max
);
Gets the range allowed for spin_button
. See
gtk_spin_button_set_range()
.
gtk_spin_button_get_snap_to_ticks ()
gboolean
gtk_spin_button_get_snap_to_ticks (GtkSpinButton *spin_button
);
Returns whether the values are corrected to the nearest step. See
gtk_spin_button_set_snap_to_ticks()
.
gtk_spin_button_get_update_policy ()
GtkSpinButtonUpdatePolicy
gtk_spin_button_get_update_policy (GtkSpinButton *spin_button
);
Gets the update behavior of a spin button. See
gtk_spin_button_set_update_policy()
.
gtk_spin_button_get_value ()
gdouble
gtk_spin_button_get_value (GtkSpinButton *spin_button
);
Get the value in the spin_button
.
gtk_spin_button_get_wrap ()
gboolean
gtk_spin_button_get_wrap (GtkSpinButton *spin_button
);
Returns whether the spin button's value wraps around to the
opposite limit when the upper or lower limit of the range is
exceeded. See gtk_spin_button_set_wrap()
.
Types and Values
struct GtkSpinButton
struct GtkSpinButton;
entry
is the GtkEntry part of the GtkSpinButton
widget, and can be used accordingly. All other fields contain private data
and should only be modified using the functions below.
enum GtkSpinButtonUpdatePolicy
GTK_UPDATE_ALWAYS | When refreshing your GtkSpinButton, the value is always displayed. |
GTK_UPDATE_IF_VALID | When refreshing your GtkSpinButton, the value is only displayed if it is valid within the bounds of the spin button's GtkAdjustment. |
enum GtkSpinType
GTK_SPIN_STEP_FORWARD, GTK_SPIN_STEP_BACKWARD, GTK_SPIN_PAGE_FORWARD, GTK_SPIN_PAGE_BACKWARD | These values spin a GtkSpinButton by the relevant values of the spin button's GtkAdjustment. |
GTK_SPIN_HOME, GTK_SPIN_END | These set the spin button's value to the minimum or maxmimum possible values, (set by its GtkAdjustment), respectively. |
GTK_SPIN_USER_DEFINED | The programmer must specify the exact amount to spin the GtkSpinButton. |
gtk_spin_button_get_value_as_float
#define gtk_spin_button_get_value_as_float gtk_spin_button_get_value
gtk_spin_button_get_value_as_float
is deprecated and should not be used in newly-written code.
Use gtk_spin_button_get_value()
instead.
Gets the value in the spin_button
.
Property Details
The “adjustment”
property
“adjustment” GtkAdjustment *
The adjustment that holds the value of the spinbutton.
Flags: Read / Write
The “climb-rate”
property
“climb-rate” gdouble
The acceleration rate when you hold down a button.
Flags: Read / Write
Allowed values: >= 0
Default value: 0
The “digits”
property
“digits” guint
The number of decimal places to display.
Flags: Read / Write
Allowed values: <= 20
Default value: 0
The “numeric”
property
“numeric” gboolean
Whether non-numeric characters should be ignored.
Flags: Read / Write
Default value: FALSE
The “snap-to-ticks”
property
“snap-to-ticks” gboolean
Whether erroneous values are automatically changed to a spin button's nearest step increment.
Flags: Read / Write
Default value: FALSE
The “update-policy”
property
“update-policy” GtkSpinButtonUpdatePolicy
Whether the spin button should update always, or only when the value is legal.
Flags: Read / Write
Default value: GTK_UPDATE_ALWAYS
The “value”
property
“value” gdouble
Reads the current value, or sets a new value.
Flags: Read / Write
Default value: 0
The “wrap”
property
“wrap” gboolean
Whether a spin button should wrap upon reaching its limits.
Flags: Read / Write
Default value: FALSE
Style Property Details
The “shadow-type”
style property
“shadow-type” GtkShadowType
the type of border that surrounds the arrows of a spin button.
Flags: Read
Default value: GTK_SHADOW_IN
Signal Details
The “change-value”
signal
void user_function (GtkSpinButton *spinbutton, GtkScrollType arg1, gpointer user_data)
Parameters
spinbutton |
the object which received the signal. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Action
The “input”
signal
gint user_function (GtkSpinButton *spinbutton, gpointer arg1, gpointer user_data)
Parameters
spinbutton |
the object which received the signal. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
The “output”
signal
gboolean user_function (GtkSpinButton *spin_button, gpointer user_data)
The ::output signal can be used to change to formatting of the value that is displayed in the spin buttons entry.
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/* show leading zeros */ static gboolean on_output (GtkSpinButton *spin, gpointer data) { GtkAdjustment *adj; gchar *text; int value; adj = gtk_spin_button_get_adjustment (spin); value = (int)gtk_adjustment_get_value (adj); text = g_strdup_printf ("%02d", value); gtk_entry_set_text (GTK_ENTRY (spin), text); g_free (text); return TRUE; } |
Parameters
spin_button |
the object which received the signal |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
The “value-changed”
signal
void user_function (GtkSpinButton *spinbutton, gpointer user_data)
Parameters
spinbutton |
the object which received the signal. |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
The “wrapped”
signal
void user_function (GtkSpinButton *spinbutton, gpointer user_data)
The wrapped signal is emitted right after the spinbutton wraps from its maximum to minimum value or vice-versa.
Parameters
spinbutton |
the object which received the signal |
|
user_data |
user data set when the signal handler was connected. |
Flags: Run Last
Since: 2.10