forked from AuroraMiddleware/gtk
a546ae32d7
Those property features don't seem to be in use anywhere. They are redundant since the docs cover the same information and more. They also created unnecessary translation work. Closes #4904
307 lines
9.8 KiB
C
307 lines
9.8 KiB
C
/* gtkscrollable.c
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* Copyright (C) 2008 Tadej Borovšak <tadeboro@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* GtkScrollable:
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*
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* `GtkScrollable` is an interface for widgets with native scrolling ability.
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*
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* To implement this interface you should override the
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* [property@Gtk.Scrollable:hadjustment] and
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* [property@Gtk.Scrollable:vadjustment] properties.
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*
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* ## Creating a scrollable widget
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*
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* All scrollable widgets should do the following.
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*
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* - When a parent widget sets the scrollable child widget’s adjustments,
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* the widget should connect to the [signal@Gtk.Adjustment::value-changed]
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* signal. The child widget should then populate the adjustments’ properties
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* as soon as possible, which usually means queueing an allocation right away
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* and populating the properties in the [vfunc@Gtk.Widget.size_allocate]
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* implementation.
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*
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* - Because its preferred size is the size for a fully expanded widget,
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* the scrollable widget must be able to cope with underallocations.
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* This means that it must accept any value passed to its
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* [vfunc@Gtk.Widget.size_allocate] implementation.
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*
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* - When the parent allocates space to the scrollable child widget,
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* the widget must ensure the adjustments’ property values are correct and up
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* to date, for example using [method@Gtk.Adjustment.configure].
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*
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* - When any of the adjustments emits the [signal@Gtk.Adjustment::value-changed]
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* signal, the scrollable widget should scroll its contents.
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*/
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#include "config.h"
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#include "gtkscrollable.h"
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#include "gtkadjustment.h"
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#include "gtkprivate.h"
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#include "gtktypebuiltins.h"
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#include "gtkintl.h"
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G_DEFINE_INTERFACE (GtkScrollable, gtk_scrollable, G_TYPE_OBJECT)
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static void
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gtk_scrollable_default_init (GtkScrollableInterface *iface)
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{
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GParamSpec *pspec;
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/**
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* GtkScrollable:hadjustment: (attributes org.gtk.Property.get=gtk_scrollable_get_hadjustment org.gtk.Property.set=gtk_scrollable_set_hadjustment)
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*
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* Horizontal `GtkAdjustment` of the scrollable widget.
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*
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* This adjustment is shared between the scrollable widget and its parent.
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*/
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pspec = g_param_spec_object ("hadjustment", NULL, NULL,
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GTK_TYPE_ADJUSTMENT,
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GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT);
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g_object_interface_install_property (iface, pspec);
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/**
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* GtkScrollable:vadjustment: (attributes org.gtk.Property.get=gtk_scrollable_get_vadjustment org.gtk.Property.set=gtk_scrollable_set_vadjustment)
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*
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* Vertical `GtkAdjustment` of the scrollable widget.
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*
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* This adjustment is shared between the scrollable widget and its parent.
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*/
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pspec = g_param_spec_object ("vadjustment", NULL, NULL,
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GTK_TYPE_ADJUSTMENT,
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GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT);
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g_object_interface_install_property (iface, pspec);
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/**
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* GtkScrollable:hscroll-policy: (attributes org.gtk.Property.get=gtk_scrollable_get_hscroll_policy org.gtk.Property.set=gtk_scrollable_set_hscroll_policy)
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*
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* Determines when horizontal scrolling should start.
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*/
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pspec = g_param_spec_enum ("hscroll-policy", NULL, NULL,
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GTK_TYPE_SCROLLABLE_POLICY,
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GTK_SCROLL_MINIMUM,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
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g_object_interface_install_property (iface, pspec);
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/**
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* GtkScrollable:vscroll-policy: (attributes org.gtk.Property.get=gtk_scrollable_get_vscroll_policy org.gtk.Property.set=gtk_scrollable_set_vscroll_policy)
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*
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* Determines when vertical scrolling should start.
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*/
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pspec = g_param_spec_enum ("vscroll-policy", NULL, NULL,
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GTK_TYPE_SCROLLABLE_POLICY,
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GTK_SCROLL_MINIMUM,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
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g_object_interface_install_property (iface, pspec);
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}
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/**
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* gtk_scrollable_get_hadjustment: (attributes org.gtk.Method.get_property=hadjustment)
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* @scrollable: a `GtkScrollable`
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*
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* Retrieves the `GtkAdjustment` used for horizontal scrolling.
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*
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* Returns: (transfer none) (nullable): horizontal `GtkAdjustment`.
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*/
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GtkAdjustment *
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gtk_scrollable_get_hadjustment (GtkScrollable *scrollable)
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{
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GtkAdjustment *adj = NULL;
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g_return_val_if_fail (GTK_IS_SCROLLABLE (scrollable), NULL);
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g_object_get (scrollable, "hadjustment", &adj, NULL);
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/* Horrid hack; g_object_get() returns a new reference but
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* that contradicts the memory management conventions
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* for accessors.
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*/
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if (adj)
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g_object_unref (adj);
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return adj;
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}
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/**
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* gtk_scrollable_set_hadjustment: (attributes org.gtk.Method.set_property=hadjustment)
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* @scrollable: a `GtkScrollable`
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* @hadjustment: (nullable): a `GtkAdjustment`
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*
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* Sets the horizontal adjustment of the `GtkScrollable`.
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*/
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void
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gtk_scrollable_set_hadjustment (GtkScrollable *scrollable,
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GtkAdjustment *hadjustment)
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{
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g_return_if_fail (GTK_IS_SCROLLABLE (scrollable));
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g_return_if_fail (hadjustment == NULL || GTK_IS_ADJUSTMENT (hadjustment));
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g_object_set (scrollable, "hadjustment", hadjustment, NULL);
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}
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/**
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* gtk_scrollable_get_vadjustment: (attributes org.gtk.Method.get_property=vadjustment)
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* @scrollable: a `GtkScrollable`
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*
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* Retrieves the `GtkAdjustment` used for vertical scrolling.
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*
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* Returns: (transfer none) (nullable): vertical `GtkAdjustment`.
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*/
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GtkAdjustment *
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gtk_scrollable_get_vadjustment (GtkScrollable *scrollable)
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{
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GtkAdjustment *adj = NULL;
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g_return_val_if_fail (GTK_IS_SCROLLABLE (scrollable), NULL);
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g_object_get (scrollable, "vadjustment", &adj, NULL);
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/* Horrid hack; g_object_get() returns a new reference but
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* that contradicts the memory management conventions
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* for accessors.
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*/
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if (adj)
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g_object_unref (adj);
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return adj;
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}
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/**
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* gtk_scrollable_set_vadjustment: (attributes org.gtk.Method.set_property=vadjustment)
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* @scrollable: a `GtkScrollable`
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* @vadjustment: (nullable): a `GtkAdjustment`
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*
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* Sets the vertical adjustment of the `GtkScrollable`.
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*/
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void
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gtk_scrollable_set_vadjustment (GtkScrollable *scrollable,
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GtkAdjustment *vadjustment)
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{
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g_return_if_fail (GTK_IS_SCROLLABLE (scrollable));
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g_return_if_fail (vadjustment == NULL || GTK_IS_ADJUSTMENT (vadjustment));
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g_object_set (scrollable, "vadjustment", vadjustment, NULL);
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}
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/**
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* gtk_scrollable_get_hscroll_policy: (attributes org.gtk.Method.get_property=hscroll-policy)
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* @scrollable: a `GtkScrollable`
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*
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* Gets the horizontal `GtkScrollablePolicy`.
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*
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* Returns: The horizontal `GtkScrollablePolicy`.
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*/
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GtkScrollablePolicy
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gtk_scrollable_get_hscroll_policy (GtkScrollable *scrollable)
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{
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GtkScrollablePolicy policy;
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g_return_val_if_fail (GTK_IS_SCROLLABLE (scrollable), GTK_SCROLL_MINIMUM);
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g_object_get (scrollable, "hscroll-policy", &policy, NULL);
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return policy;
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}
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/**
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* gtk_scrollable_set_hscroll_policy: (attributes org.gtk.Method.set_property=hscroll-policy)
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* @scrollable: a `GtkScrollable`
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* @policy: the horizontal `GtkScrollablePolicy`
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*
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* Sets the `GtkScrollablePolicy`.
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*
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* The policy determines whether horizontal scrolling should start
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* below the minimum width or below the natural width.
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*/
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void
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gtk_scrollable_set_hscroll_policy (GtkScrollable *scrollable,
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GtkScrollablePolicy policy)
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{
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g_return_if_fail (GTK_IS_SCROLLABLE (scrollable));
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g_object_set (scrollable, "hscroll-policy", policy, NULL);
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}
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/**
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* gtk_scrollable_get_vscroll_policy: (attributes org.gtk.Method.get_property=vscroll-policy)
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* @scrollable: a `GtkScrollable`
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*
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* Gets the vertical `GtkScrollablePolicy`.
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*
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* Returns: The vertical `GtkScrollablePolicy`.
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*/
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GtkScrollablePolicy
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gtk_scrollable_get_vscroll_policy (GtkScrollable *scrollable)
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{
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GtkScrollablePolicy policy;
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g_return_val_if_fail (GTK_IS_SCROLLABLE (scrollable), GTK_SCROLL_MINIMUM);
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g_object_get (scrollable, "vscroll-policy", &policy, NULL);
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return policy;
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}
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/**
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* gtk_scrollable_set_vscroll_policy: (attributes org.gtk.Method.set_property=vscroll-policy)
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* @scrollable: a `GtkScrollable`
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* @policy: the vertical `GtkScrollablePolicy`
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*
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* Sets the `GtkScrollablePolicy`.
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*
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* The policy determines whether vertical scrolling should start
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* below the minimum height or below the natural height.
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*/
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void
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gtk_scrollable_set_vscroll_policy (GtkScrollable *scrollable,
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GtkScrollablePolicy policy)
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{
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g_return_if_fail (GTK_IS_SCROLLABLE (scrollable));
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g_object_set (scrollable, "vscroll-policy", policy, NULL);
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}
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/**
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* gtk_scrollable_get_border:
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* @scrollable: a `GtkScrollable`
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* @border: (out caller-allocates): return location for the results
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*
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* Returns the size of a non-scrolling border around the
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* outside of the scrollable.
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*
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* An example for this would be treeview headers. GTK can use
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* this information to display overlaid graphics, like the
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* overshoot indication, at the right position.
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*
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* Returns: %TRUE if @border has been set
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*/
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gboolean
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gtk_scrollable_get_border (GtkScrollable *scrollable,
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GtkBorder *border)
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{
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g_return_val_if_fail (GTK_IS_SCROLLABLE (scrollable), FALSE);
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g_return_val_if_fail (border != NULL, FALSE);
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if (GTK_SCROLLABLE_GET_IFACE (scrollable)->get_border)
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return GTK_SCROLLABLE_GET_IFACE (scrollable)->get_border (scrollable, border);
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return FALSE;
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}
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