forked from AuroraMiddleware/gtk
8755d884f3
4.0 will represent a clean epoch. We don't want to have lots of noise in the docs about 2.x or 3.x.
638 lines
22 KiB
C
638 lines
22 KiB
C
/* gtkcellareacontext.c
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*
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* Copyright (C) 2010 Openismus GmbH
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*
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* Authors:
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* Tristan Van Berkom <tristanvb@openismus.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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library 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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* SECTION:gtkcellareacontext
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* @Short_Description: Stores geometrical information for a series of rows in a GtkCellArea
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* @Title: GtkCellAreaContext
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*
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* The #GtkCellAreaContext object is created by a given #GtkCellArea
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* implementation via its #GtkCellAreaClass.create_context() virtual
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* method and is used to store cell sizes and alignments for a series of
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* #GtkTreeModel rows that are requested and rendered in the same context.
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*
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* #GtkCellLayout widgets can create any number of contexts in which to
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* request and render groups of data rows. However, it’s important that the
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* same context which was used to request sizes for a given #GtkTreeModel
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* row also be used for the same row when calling other #GtkCellArea APIs
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* such as gtk_cell_area_render() and gtk_cell_area_event().
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*/
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#include "config.h"
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#include "gtkintl.h"
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#include "gtkmarshalers.h"
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#include "gtkcellareacontext.h"
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#include "gtkprivate.h"
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/* GObjectClass */
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static void gtk_cell_area_context_dispose (GObject *object);
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static void gtk_cell_area_context_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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static void gtk_cell_area_context_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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/* GtkCellAreaContextClass */
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static void gtk_cell_area_context_real_reset (GtkCellAreaContext *context);
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static void gtk_cell_area_context_real_allocate (GtkCellAreaContext *context,
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gint width,
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gint height);
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struct _GtkCellAreaContextPrivate
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{
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GtkCellArea *cell_area;
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gint min_width;
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gint nat_width;
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gint min_height;
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gint nat_height;
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gint alloc_width;
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gint alloc_height;
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};
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enum {
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PROP_0,
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PROP_CELL_AREA,
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PROP_MIN_WIDTH,
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PROP_NAT_WIDTH,
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PROP_MIN_HEIGHT,
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PROP_NAT_HEIGHT
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};
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G_DEFINE_TYPE_WITH_PRIVATE (GtkCellAreaContext, gtk_cell_area_context, G_TYPE_OBJECT)
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static void
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gtk_cell_area_context_init (GtkCellAreaContext *context)
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{
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context->priv = gtk_cell_area_context_get_instance_private (context);
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}
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static void
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gtk_cell_area_context_class_init (GtkCellAreaContextClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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/* GObjectClass */
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object_class->dispose = gtk_cell_area_context_dispose;
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object_class->get_property = gtk_cell_area_context_get_property;
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object_class->set_property = gtk_cell_area_context_set_property;
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/* GtkCellAreaContextClass */
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class->reset = gtk_cell_area_context_real_reset;
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class->allocate = gtk_cell_area_context_real_allocate;
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/**
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* GtkCellAreaContext:area:
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*
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* The #GtkCellArea this context was created by
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*/
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g_object_class_install_property (object_class,
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PROP_CELL_AREA,
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g_param_spec_object ("area",
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P_("Area"),
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P_("The Cell Area this context was created for"),
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GTK_TYPE_CELL_AREA,
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GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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/**
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* GtkCellAreaContext:minimum-width:
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*
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* The minimum width for the #GtkCellArea in this context
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* for all #GtkTreeModel rows that this context was requested
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* for using gtk_cell_area_get_preferred_width().
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*/
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g_object_class_install_property (object_class,
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PROP_MIN_WIDTH,
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g_param_spec_int ("minimum-width",
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P_("Minimum Width"),
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P_("Minimum cached width"),
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-1, G_MAXINT, -1,
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GTK_PARAM_READABLE));
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/**
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* GtkCellAreaContext:natural-width:
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*
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* The natural width for the #GtkCellArea in this context
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* for all #GtkTreeModel rows that this context was requested
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* for using gtk_cell_area_get_preferred_width().
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*/
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g_object_class_install_property (object_class,
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PROP_NAT_WIDTH,
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g_param_spec_int ("natural-width",
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P_("Minimum Width"),
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P_("Minimum cached width"),
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-1, G_MAXINT, -1,
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GTK_PARAM_READABLE));
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/**
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* GtkCellAreaContext:minimum-height:
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*
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* The minimum height for the #GtkCellArea in this context
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* for all #GtkTreeModel rows that this context was requested
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* for using gtk_cell_area_get_preferred_height().
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*/
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g_object_class_install_property (object_class,
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PROP_MIN_HEIGHT,
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g_param_spec_int ("minimum-height",
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P_("Minimum Height"),
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P_("Minimum cached height"),
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-1, G_MAXINT, -1,
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GTK_PARAM_READABLE));
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/**
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* GtkCellAreaContext:natural-height:
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*
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* The natural height for the #GtkCellArea in this context
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* for all #GtkTreeModel rows that this context was requested
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* for using gtk_cell_area_get_preferred_height().
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*/
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g_object_class_install_property (object_class,
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PROP_NAT_HEIGHT,
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g_param_spec_int ("natural-height",
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P_("Minimum Height"),
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P_("Minimum cached height"),
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-1, G_MAXINT, -1,
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GTK_PARAM_READABLE));
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}
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/*************************************************************
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* GObjectClass *
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*************************************************************/
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static void
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gtk_cell_area_context_dispose (GObject *object)
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{
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GtkCellAreaContext *context = GTK_CELL_AREA_CONTEXT (object);
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GtkCellAreaContextPrivate *priv = context->priv;
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if (priv->cell_area)
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{
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g_object_unref (priv->cell_area);
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priv->cell_area = NULL;
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}
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G_OBJECT_CLASS (gtk_cell_area_context_parent_class)->dispose (object);
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}
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static void
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gtk_cell_area_context_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkCellAreaContext *context = GTK_CELL_AREA_CONTEXT (object);
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GtkCellAreaContextPrivate *priv = context->priv;
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switch (prop_id)
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{
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case PROP_CELL_AREA:
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priv->cell_area = g_value_dup_object (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_cell_area_context_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkCellAreaContext *context = GTK_CELL_AREA_CONTEXT (object);
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GtkCellAreaContextPrivate *priv = context->priv;
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switch (prop_id)
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{
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case PROP_CELL_AREA:
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g_value_set_object (value, priv->cell_area);
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break;
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case PROP_MIN_WIDTH:
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g_value_set_int (value, priv->min_width);
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break;
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case PROP_NAT_WIDTH:
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g_value_set_int (value, priv->nat_width);
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break;
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case PROP_MIN_HEIGHT:
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g_value_set_int (value, priv->min_height);
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break;
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case PROP_NAT_HEIGHT:
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g_value_set_int (value, priv->nat_height);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/*************************************************************
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* GtkCellAreaContextClass *
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*************************************************************/
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static void
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gtk_cell_area_context_real_reset (GtkCellAreaContext *context)
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{
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GtkCellAreaContextPrivate *priv = context->priv;
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g_object_freeze_notify (G_OBJECT (context));
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if (priv->min_width != 0)
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{
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priv->min_width = 0;
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g_object_notify (G_OBJECT (context), "minimum-width");
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}
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if (priv->nat_width != 0)
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{
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priv->nat_width = 0;
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g_object_notify (G_OBJECT (context), "natural-width");
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}
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if (priv->min_height != 0)
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{
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priv->min_height = 0;
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g_object_notify (G_OBJECT (context), "minimum-height");
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}
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if (priv->nat_height != 0)
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{
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priv->nat_height = 0;
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g_object_notify (G_OBJECT (context), "natural-height");
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}
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priv->alloc_width = 0;
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priv->alloc_height = 0;
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g_object_thaw_notify (G_OBJECT (context));
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}
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static void
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gtk_cell_area_context_real_allocate (GtkCellAreaContext *context,
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gint width,
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gint height)
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{
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GtkCellAreaContextPrivate *priv = context->priv;
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priv->alloc_width = width;
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priv->alloc_height = height;
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}
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/*************************************************************
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* API *
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*************************************************************/
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/**
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* gtk_cell_area_context_get_area:
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* @context: a #GtkCellAreaContext
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*
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* Fetches the #GtkCellArea this @context was created by.
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*
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* This is generally unneeded by layouting widgets; however,
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* it is important for the context implementation itself to
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* fetch information about the area it is being used for.
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*
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* For instance at #GtkCellAreaContextClass.allocate() time
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* it’s important to know details about any cell spacing
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* that the #GtkCellArea is configured with in order to
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* compute a proper allocation.
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*
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* Returns: (transfer none): the #GtkCellArea this context was created by.
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*/
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GtkCellArea *
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gtk_cell_area_context_get_area (GtkCellAreaContext *context)
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{
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GtkCellAreaContextPrivate *priv;
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g_return_val_if_fail (GTK_IS_CELL_AREA_CONTEXT (context), NULL);
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priv = context->priv;
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return priv->cell_area;
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}
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/**
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* gtk_cell_area_context_reset:
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* @context: a #GtkCellAreaContext
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*
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* Resets any previously cached request and allocation
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* data.
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*
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* When underlying #GtkTreeModel data changes its
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* important to reset the context if the content
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* size is allowed to shrink. If the content size
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* is only allowed to grow (this is usually an option
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* for views rendering large data stores as a measure
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* of optimization), then only the row that changed
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* or was inserted needs to be (re)requested with
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* gtk_cell_area_get_preferred_width().
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*
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* When the new overall size of the context requires
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* that the allocated size changes (or whenever this
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* allocation changes at all), the variable row
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* sizes need to be re-requested for every row.
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*
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* For instance, if the rows are displayed all with
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* the same width from top to bottom then a change
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* in the allocated width necessitates a recalculation
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* of all the displayed row heights using
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* gtk_cell_area_get_preferred_height_for_width().
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*/
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void
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gtk_cell_area_context_reset (GtkCellAreaContext *context)
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{
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g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
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GTK_CELL_AREA_CONTEXT_GET_CLASS (context)->reset (context);
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}
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/**
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* gtk_cell_area_context_allocate:
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* @context: a #GtkCellAreaContext
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* @width: the allocated width for all #GtkTreeModel rows rendered
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* with @context, or -1.
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* @height: the allocated height for all #GtkTreeModel rows rendered
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* with @context, or -1.
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*
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* Allocates a width and/or a height for all rows which are to be
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* rendered with @context.
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*
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* Usually allocation is performed only horizontally or sometimes
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* vertically since a group of rows are usually rendered side by
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* side vertically or horizontally and share either the same width
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* or the same height. Sometimes they are allocated in both horizontal
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* and vertical orientations producing a homogeneous effect of the
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* rows. This is generally the case for #GtkTreeView when
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* #GtkTreeView:fixed-height-mode is enabled.
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*/
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void
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gtk_cell_area_context_allocate (GtkCellAreaContext *context,
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gint width,
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gint height)
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{
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g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
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GTK_CELL_AREA_CONTEXT_GET_CLASS (context)->allocate (context, width, height);
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}
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/**
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* gtk_cell_area_context_get_preferred_width:
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* @context: a #GtkCellAreaContext
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* @minimum_width: (out) (allow-none): location to store the minimum width,
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* or %NULL
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* @natural_width: (out) (allow-none): location to store the natural width,
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* or %NULL
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*
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* Gets the accumulative preferred width for all rows which have been
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* requested with this context.
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*
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* After gtk_cell_area_context_reset() is called and/or before ever
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* requesting the size of a #GtkCellArea, the returned values are 0.
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*/
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void
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gtk_cell_area_context_get_preferred_width (GtkCellAreaContext *context,
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gint *minimum_width,
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gint *natural_width)
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{
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GtkCellAreaContextPrivate *priv;
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g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
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priv = context->priv;
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if (minimum_width)
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*minimum_width = priv->min_width;
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if (natural_width)
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*natural_width = priv->nat_width;
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}
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/**
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* gtk_cell_area_context_get_preferred_height:
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* @context: a #GtkCellAreaContext
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* @minimum_height: (out) (allow-none): location to store the minimum height,
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* or %NULL
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* @natural_height: (out) (allow-none): location to store the natural height,
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* or %NULL
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*
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* Gets the accumulative preferred height for all rows which have been
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* requested with this context.
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*
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* After gtk_cell_area_context_reset() is called and/or before ever
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* requesting the size of a #GtkCellArea, the returned values are 0.
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*/
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void
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gtk_cell_area_context_get_preferred_height (GtkCellAreaContext *context,
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gint *minimum_height,
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gint *natural_height)
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{
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GtkCellAreaContextPrivate *priv;
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g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
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priv = context->priv;
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if (minimum_height)
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*minimum_height = priv->min_height;
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if (natural_height)
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*natural_height = priv->nat_height;
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}
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/**
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* gtk_cell_area_context_get_preferred_height_for_width:
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* @context: a #GtkCellAreaContext
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* @width: a proposed width for allocation
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* @minimum_height: (out) (allow-none): location to store the minimum height,
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* or %NULL
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* @natural_height: (out) (allow-none): location to store the natural height,
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* or %NULL
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*
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* Gets the accumulative preferred height for @width for all rows
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* which have been requested for the same said @width with this context.
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*
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* After gtk_cell_area_context_reset() is called and/or before ever
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* requesting the size of a #GtkCellArea, the returned values are -1.
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*/
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void
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gtk_cell_area_context_get_preferred_height_for_width (GtkCellAreaContext *context,
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gint width,
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gint *minimum_height,
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gint *natural_height)
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{
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g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
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if (GTK_CELL_AREA_CONTEXT_GET_CLASS (context)->get_preferred_height_for_width)
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GTK_CELL_AREA_CONTEXT_GET_CLASS (context)->get_preferred_height_for_width (context,
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width,
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minimum_height,
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natural_height);
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}
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/**
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* gtk_cell_area_context_get_preferred_width_for_height:
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* @context: a #GtkCellAreaContext
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* @height: a proposed height for allocation
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* @minimum_width: (out) (allow-none): location to store the minimum width,
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* or %NULL
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* @natural_width: (out) (allow-none): location to store the natural width,
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* or %NULL
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*
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* Gets the accumulative preferred width for @height for all rows which
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* have been requested for the same said @height with this context.
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*
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* After gtk_cell_area_context_reset() is called and/or before ever
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* requesting the size of a #GtkCellArea, the returned values are -1.
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*/
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void
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gtk_cell_area_context_get_preferred_width_for_height (GtkCellAreaContext *context,
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gint height,
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gint *minimum_width,
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gint *natural_width)
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{
|
||
g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
|
||
|
||
if (GTK_CELL_AREA_CONTEXT_GET_CLASS (context)->get_preferred_width_for_height)
|
||
GTK_CELL_AREA_CONTEXT_GET_CLASS (context)->get_preferred_width_for_height (context,
|
||
height,
|
||
minimum_width,
|
||
natural_width);
|
||
}
|
||
|
||
/**
|
||
* gtk_cell_area_context_get_allocation:
|
||
* @context: a #GtkCellAreaContext
|
||
* @width: (out) (allow-none): location to store the allocated width, or %NULL
|
||
* @height: (out) (allow-none): location to store the allocated height, or %NULL
|
||
*
|
||
* Fetches the current allocation size for @context.
|
||
*
|
||
* If the context was not allocated in width or height, or if the
|
||
* context was recently reset with gtk_cell_area_context_reset(),
|
||
* the returned value will be -1.
|
||
*/
|
||
void
|
||
gtk_cell_area_context_get_allocation (GtkCellAreaContext *context,
|
||
gint *width,
|
||
gint *height)
|
||
{
|
||
GtkCellAreaContextPrivate *priv;
|
||
|
||
g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
|
||
|
||
priv = context->priv;
|
||
|
||
if (width)
|
||
*width = priv->alloc_width;
|
||
|
||
if (height)
|
||
*height = priv->alloc_height;
|
||
}
|
||
|
||
/**
|
||
* gtk_cell_area_context_push_preferred_width:
|
||
* @context: a #GtkCellAreaContext
|
||
* @minimum_width: the proposed new minimum width for @context
|
||
* @natural_width: the proposed new natural width for @context
|
||
*
|
||
* Causes the minimum and/or natural width to grow if the new
|
||
* proposed sizes exceed the current minimum and natural width.
|
||
*
|
||
* This is used by #GtkCellAreaContext implementations during
|
||
* the request process over a series of #GtkTreeModel rows to
|
||
* progressively push the requested width over a series of
|
||
* gtk_cell_area_get_preferred_width() requests.
|
||
*/
|
||
void
|
||
gtk_cell_area_context_push_preferred_width (GtkCellAreaContext *context,
|
||
gint minimum_width,
|
||
gint natural_width)
|
||
{
|
||
GtkCellAreaContextPrivate *priv;
|
||
|
||
g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
|
||
|
||
priv = context->priv;
|
||
|
||
g_object_freeze_notify (G_OBJECT (context));
|
||
|
||
if (minimum_width > priv->min_width)
|
||
{
|
||
priv->min_width = minimum_width;
|
||
|
||
g_object_notify (G_OBJECT (context), "minimum-width");
|
||
}
|
||
|
||
if (natural_width > priv->nat_width)
|
||
{
|
||
priv->nat_width = natural_width;
|
||
|
||
g_object_notify (G_OBJECT (context), "natural-width");
|
||
}
|
||
|
||
g_object_thaw_notify (G_OBJECT (context));
|
||
}
|
||
|
||
/**
|
||
* gtk_cell_area_context_push_preferred_height:
|
||
* @context: a #GtkCellAreaContext
|
||
* @minimum_height: the proposed new minimum height for @context
|
||
* @natural_height: the proposed new natural height for @context
|
||
*
|
||
* Causes the minimum and/or natural height to grow if the new
|
||
* proposed sizes exceed the current minimum and natural height.
|
||
*
|
||
* This is used by #GtkCellAreaContext implementations during
|
||
* the request process over a series of #GtkTreeModel rows to
|
||
* progressively push the requested height over a series of
|
||
* gtk_cell_area_get_preferred_height() requests.
|
||
*/
|
||
void
|
||
gtk_cell_area_context_push_preferred_height (GtkCellAreaContext *context,
|
||
gint minimum_height,
|
||
gint natural_height)
|
||
{
|
||
GtkCellAreaContextPrivate *priv;
|
||
|
||
g_return_if_fail (GTK_IS_CELL_AREA_CONTEXT (context));
|
||
|
||
priv = context->priv;
|
||
|
||
g_object_freeze_notify (G_OBJECT (context));
|
||
|
||
if (minimum_height > priv->min_height)
|
||
{
|
||
priv->min_height = minimum_height;
|
||
|
||
g_object_notify (G_OBJECT (context), "minimum-height");
|
||
}
|
||
|
||
if (natural_height > priv->nat_height)
|
||
{
|
||
priv->nat_height = natural_height;
|
||
|
||
g_object_notify (G_OBJECT (context), "natural-height");
|
||
}
|
||
|
||
g_object_thaw_notify (G_OBJECT (context));
|
||
}
|