forked from AuroraMiddleware/gtk
128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/**
|
|
* GtkCustomLayout:
|
|
*
|
|
* `GtkCustomLayout` uses closures for size negotiation.
|
|
*
|
|
* A `GtkCustomLayout `uses closures matching to the old `GtkWidget`
|
|
* virtual functions for size negotiation, as a convenience API to
|
|
* ease the porting towards the corresponding `GtkLayoutManager
|
|
* virtual functions.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include "gtkcustomlayout.h"
|
|
|
|
struct _GtkCustomLayout
|
|
{
|
|
GtkLayoutManager parent_instance;
|
|
|
|
GtkCustomRequestModeFunc request_mode_func;
|
|
GtkCustomMeasureFunc measure_func;
|
|
GtkCustomAllocateFunc allocate_func;
|
|
};
|
|
|
|
G_DEFINE_TYPE (GtkCustomLayout, gtk_custom_layout, GTK_TYPE_LAYOUT_MANAGER)
|
|
|
|
static GtkSizeRequestMode
|
|
gtk_custom_layout_get_request_mode (GtkLayoutManager *manager,
|
|
GtkWidget *widget)
|
|
{
|
|
GtkCustomLayout *self = GTK_CUSTOM_LAYOUT (manager);
|
|
|
|
if (self->request_mode_func != NULL)
|
|
return self->request_mode_func (widget);
|
|
|
|
return GTK_LAYOUT_MANAGER_CLASS (gtk_custom_layout_parent_class)->get_request_mode (manager, widget);
|
|
}
|
|
|
|
static void
|
|
gtk_custom_layout_measure (GtkLayoutManager *manager,
|
|
GtkWidget *widget,
|
|
GtkOrientation orientation,
|
|
int for_size,
|
|
int *minimum,
|
|
int *natural,
|
|
int *minimum_baseline,
|
|
int *natural_baseline)
|
|
{
|
|
GtkCustomLayout *self = GTK_CUSTOM_LAYOUT (manager);
|
|
int min = 0, nat = 0;
|
|
int min_baseline = -1, nat_baseline = -1;
|
|
|
|
self->measure_func (widget, orientation, for_size,
|
|
&min, &nat,
|
|
&min_baseline, &nat_baseline);
|
|
|
|
if (minimum != NULL)
|
|
*minimum = min;
|
|
if (natural != NULL)
|
|
*natural = nat;
|
|
|
|
if (minimum_baseline != NULL)
|
|
*minimum_baseline = min_baseline;
|
|
if (natural_baseline != NULL)
|
|
*natural_baseline = nat_baseline;
|
|
}
|
|
|
|
static void
|
|
gtk_custom_layout_allocate (GtkLayoutManager *manager,
|
|
GtkWidget *widget,
|
|
int width,
|
|
int height,
|
|
int baseline)
|
|
{
|
|
GtkCustomLayout *self = GTK_CUSTOM_LAYOUT (manager);
|
|
|
|
self->allocate_func (widget, width, height, baseline);
|
|
}
|
|
|
|
static void
|
|
gtk_custom_layout_class_init (GtkCustomLayoutClass *klass)
|
|
{
|
|
GtkLayoutManagerClass *layout_class = GTK_LAYOUT_MANAGER_CLASS (klass);
|
|
|
|
layout_class->get_request_mode = gtk_custom_layout_get_request_mode;
|
|
layout_class->measure = gtk_custom_layout_measure;
|
|
layout_class->allocate = gtk_custom_layout_allocate;
|
|
}
|
|
|
|
static void
|
|
gtk_custom_layout_init (GtkCustomLayout *self)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* gtk_custom_layout_new:
|
|
* @request_mode: (nullable) (scope call): a function to retrieve
|
|
* the `GtkSizeRequestMode` of the widget using the layout; the
|
|
* default request mode is %GTK_SIZE_REQUEST_CONSTANT_SIZE
|
|
* @measure: (not nullable) (scope call): a function to measure the widget using the layout manager
|
|
* @allocate: (not nullable) (scope call): a function to allocate the children of the widget using
|
|
* the layout manager
|
|
*
|
|
* Creates a new legacy layout manager.
|
|
*
|
|
* Legacy layout managers map to the old `GtkWidget` size negotiation
|
|
* virtual functions, and are meant to be used during the transition
|
|
* from layout containers to layout manager delegates.
|
|
*
|
|
* Returns: (transfer full): the newly created `GtkCustomLayout`
|
|
*/
|
|
GtkLayoutManager *
|
|
gtk_custom_layout_new (GtkCustomRequestModeFunc request_mode,
|
|
GtkCustomMeasureFunc measure,
|
|
GtkCustomAllocateFunc allocate)
|
|
{
|
|
GtkCustomLayout *self = g_object_new (GTK_TYPE_CUSTOM_LAYOUT, NULL);
|
|
|
|
g_return_val_if_fail (measure != NULL, NULL);
|
|
g_return_val_if_fail (allocate != NULL, NULL);
|
|
|
|
self->request_mode_func = request_mode;
|
|
self->measure_func = measure;
|
|
self->allocate_func = allocate;
|
|
|
|
return GTK_LAYOUT_MANAGER (self);
|
|
}
|