forked from AuroraMiddleware/gtk
a27737b04e
Just like GtkContainer provides a default implementation of GtkWidgetClass.get_request_mode(), we can do the same inside GtkLayoutManager. A default implementation preserves the behavior of existing widgets that moved, or will move, to a GtkLayoutManager.
131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/**
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* SECTION:gtkcustomlayout
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* @Title: GtkCustomLayout
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* @Short_description: A convenience layout manager
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*
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* #GtkCustomLayout is a convenience type meant to be used as a transition
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* mechanism between #GtkContainers implementing a layout policy, and
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* #GtkLayoutManager classes.
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*
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* A #GtkCustomLayout uses closures matching to the old #GtkWidget virtual
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* functions for size negotiation, as a convenience API to ease the porting
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* towards the corresponding #GtkLayoutManager virtual functions.
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*/
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#include "config.h"
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#include "gtkcustomlayout.h"
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struct _GtkCustomLayout
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{
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GtkLayoutManager parent_instance;
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GtkCustomRequestModeFunc request_mode_func;
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GtkCustomMeasureFunc measure_func;
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GtkCustomAllocateFunc allocate_func;
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};
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G_DEFINE_TYPE (GtkCustomLayout, gtk_custom_layout, GTK_TYPE_LAYOUT_MANAGER)
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static GtkSizeRequestMode
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gtk_custom_layout_get_request_mode (GtkLayoutManager *manager,
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GtkWidget *widget)
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{
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GtkCustomLayout *self = GTK_CUSTOM_LAYOUT (manager);
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if (self->request_mode_func != NULL)
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return self->request_mode_func (widget);
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return GTK_LAYOUT_MANAGER_CLASS (gtk_custom_layout_parent_class)->get_request_mode (manager, widget);
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}
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static void
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gtk_custom_layout_measure (GtkLayoutManager *manager,
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GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum,
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int *natural,
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int *minimum_baseline,
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int *natural_baseline)
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{
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GtkCustomLayout *self = GTK_CUSTOM_LAYOUT (manager);
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int min = 0, nat = 0;
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int min_baseline = -1, nat_baseline = -1;
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self->measure_func (widget, orientation, for_size,
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&min, &nat,
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&min_baseline, &nat_baseline);
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if (minimum != NULL)
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*minimum = min;
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if (natural != NULL)
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*natural = nat;
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if (minimum_baseline != NULL)
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*minimum_baseline = min_baseline;
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if (natural_baseline != NULL)
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*natural_baseline = nat_baseline;
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}
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static void
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gtk_custom_layout_allocate (GtkLayoutManager *manager,
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GtkWidget *widget,
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int width,
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int height,
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int baseline)
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{
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GtkCustomLayout *self = GTK_CUSTOM_LAYOUT (manager);
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self->allocate_func (widget, width, height, baseline);
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}
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static void
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gtk_custom_layout_class_init (GtkCustomLayoutClass *klass)
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{
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GtkLayoutManagerClass *layout_class = GTK_LAYOUT_MANAGER_CLASS (klass);
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layout_class->get_request_mode = gtk_custom_layout_get_request_mode;
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layout_class->measure = gtk_custom_layout_measure;
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layout_class->allocate = gtk_custom_layout_allocate;
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}
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static void
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gtk_custom_layout_init (GtkCustomLayout *self)
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{
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}
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/**
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* gtk_custom_layout_new:
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* @request_mode: (nullable): a function to retrieve
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* the #GtkSizeRequestMode of the widget using the layout; the
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* default request mode is %GTK_SIZE_REQUEST_CONSTANT_SIZE
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* @measure: a function to measure the widget using the layout manager
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* @allocate: a function to allocate the children of the widget using
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* the layout manager
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*
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* Creates a new legacy layout manager.
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*
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* Legacy layout managers map to the old #GtkWidget size negotiation
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* virtual functions, and are meant to be used during the transition
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* from layout containers to layout manager delegates.
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*
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* Returns: (transfer full): the newly created #GtkCustomLayout
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*/
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GtkLayoutManager *
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gtk_custom_layout_new (GtkCustomRequestModeFunc request_mode,
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GtkCustomMeasureFunc measure,
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GtkCustomAllocateFunc allocate)
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{
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GtkCustomLayout *self = g_object_new (GTK_TYPE_CUSTOM_LAYOUT, NULL);
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g_return_val_if_fail (measure != NULL, NULL);
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g_return_val_if_fail (allocate != NULL, NULL);
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self->request_mode_func = request_mode;
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self->measure_func = measure;
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self->allocate_func = allocate;
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return GTK_LAYOUT_MANAGER (self);
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}
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