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gtk2/gtk/gtkgrid.c
Matthias Clasen 7a65db0402 GtkGrid: Add forgotten RTL flipping 
How did we manage to add a non-RTL savy container in GTK+ 3.0 ?
2011-03-30 08:19:30 -04:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2010 Red Hat, Inc.
* Author: Matthias Clasen
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include "gtkgrid.h"
#include "gtkorientableprivate.h"
#include "gtksizerequest.h"
#include "gtkprivate.h"
#include "gtkintl.h"
/**
* SECTION:gtkgrid
* @Short_description: Pack widgets in a rows and columns
* @Title: GtkGrid
* @See_also: #GtkTable, #GtkHBox, #GtkVBox
*
* GtkGrid is a container which arranges its child widgets in
* rows and columns. It is a very similar to #GtkTable and #GtkBox,
* but it consistently uses #GtkWidget's #GtkWidget:margin and #GtkWidget:expand
* properties instead of custom child properties, and it fully supports
* <link linkend="geometry-management">height-for-width geometry management</link>.
*
* Children are added using gtk_grid_attach(). They can span multiple
* rows or columns. It is also possible to add a child next to an
* existing child, using gtk_grid_attach_next_to().
*
* GtkGrid can be used like a #GtkBox by just using gtk_container_add(),
* which will place children next to each other in the direction determined
* by the #GtkOrientable:orientation property.
*/
typedef struct _GtkGridChild GtkGridChild;
typedef struct _GtkGridChildAttach GtkGridChildAttach;
typedef struct _GtkGridLine GtkGridLine;
typedef struct _GtkGridLines GtkGridLines;
typedef struct _GtkGridLineData GtkGridLineData;
typedef struct _GtkGridRequest GtkGridRequest;
struct _GtkGridChildAttach
{
gint pos;
gint span;
};
struct _GtkGridChild
{
GtkWidget *widget;
GtkGridChildAttach attach[2];
};
#define CHILD_LEFT(child) ((child)->attach[GTK_ORIENTATION_HORIZONTAL].pos)
#define CHILD_WIDTH(child) ((child)->attach[GTK_ORIENTATION_HORIZONTAL].span)
#define CHILD_TOP(child) ((child)->attach[GTK_ORIENTATION_VERTICAL].pos)
#define CHILD_HEIGHT(child) ((child)->attach[GTK_ORIENTATION_VERTICAL].span)
/* A GtkGridLineData struct contains row/column specific parts
* of the grid.
*/
struct _GtkGridLineData
{
gint16 spacing;
guint homogeneous : 1;
};
struct _GtkGridPrivate
{
GList *children;
GtkOrientation orientation;
GtkGridLineData linedata[2];
};
#define ROWS(priv) (&(priv)->linedata[GTK_ORIENTATION_HORIZONTAL])
#define COLUMNS(priv) (&(priv)->linedata[GTK_ORIENTATION_VERTICAL])
/* A GtkGridLine struct represents a single row or column
* during size requests
*/
struct _GtkGridLine
{
gint minimum;
gint natural;
gint position;
gint allocation;
guint need_expand : 1;
guint expand : 1;
guint empty : 1;
};
struct _GtkGridLines
{
GtkGridLine *lines;
gint min, max;
};
struct _GtkGridRequest
{
GtkGrid *grid;
GtkGridLines lines[2];
};
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_ROW_SPACING,
PROP_COLUMN_SPACING,
PROP_ROW_HOMOGENEOUS,
PROP_COLUMN_HOMOGENEOUS
};
enum
{
CHILD_PROP_0,
CHILD_PROP_LEFT_ATTACH,
CHILD_PROP_TOP_ATTACH,
CHILD_PROP_WIDTH,
CHILD_PROP_HEIGHT
};
G_DEFINE_TYPE_WITH_CODE (GtkGrid, gtk_grid, GTK_TYPE_CONTAINER,
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))
static void
gtk_grid_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkGrid *grid = GTK_GRID (object);
GtkGridPrivate *priv = grid->priv;
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
case PROP_ROW_SPACING:
g_value_set_int (value, ROWS (priv)->spacing);
break;
case PROP_COLUMN_SPACING:
g_value_set_int (value, COLUMNS (priv)->spacing);
break;
case PROP_ROW_HOMOGENEOUS:
g_value_set_boolean (value, ROWS (priv)->homogeneous);
break;
case PROP_COLUMN_HOMOGENEOUS:
g_value_set_boolean (value, COLUMNS (priv)->homogeneous);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_grid_set_orientation (GtkGrid *grid,
GtkOrientation orientation)
{
GtkGridPrivate *priv = grid->priv;
if (priv->orientation != orientation)
{
priv->orientation = orientation;
_gtk_orientable_set_style_classes (GTK_ORIENTABLE (grid));
g_object_notify (G_OBJECT (grid), "orientation");
}
}
static void
gtk_grid_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkGrid *grid = GTK_GRID (object);
switch (prop_id)
{
case PROP_ORIENTATION:
gtk_grid_set_orientation (grid, g_value_get_enum (value));
break;
case PROP_ROW_SPACING:
gtk_grid_set_row_spacing (grid, g_value_get_int (value));
break;
case PROP_COLUMN_SPACING:
gtk_grid_set_column_spacing (grid, g_value_get_int (value));
break;
case PROP_ROW_HOMOGENEOUS:
gtk_grid_set_row_homogeneous (grid, g_value_get_boolean (value));
break;
case PROP_COLUMN_HOMOGENEOUS:
gtk_grid_set_column_homogeneous (grid, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GtkGridChild *
find_grid_child (GtkGrid *grid,
GtkWidget *widget)
{
GtkGridPrivate *priv = grid->priv;
GtkGridChild *child;
GList *list;
for (list = priv->children; list; list = list->next)
{
child = list->data;
if (child->widget == widget)
return child;
}
return NULL;
}
static void
gtk_grid_get_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GtkGrid *grid = GTK_GRID (container);
GtkGridChild *grid_child;
grid_child = find_grid_child (grid, child);
if (grid_child == NULL)
{
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
return;
}
switch (property_id)
{
case CHILD_PROP_LEFT_ATTACH:
g_value_set_int (value, CHILD_LEFT (grid_child));
break;
case CHILD_PROP_TOP_ATTACH:
g_value_set_int (value, CHILD_TOP (grid_child));
break;
case CHILD_PROP_WIDTH:
g_value_set_int (value, CHILD_WIDTH (grid_child));
break;
case CHILD_PROP_HEIGHT:
g_value_set_int (value, CHILD_HEIGHT (grid_child));
break;
default:
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
break;
}
}
static void
gtk_grid_set_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GtkGrid *grid = GTK_GRID (container);
GtkGridChild *grid_child;
grid_child = find_grid_child (grid, child);
if (grid_child == NULL)
{
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
return;
}
switch (property_id)
{
case CHILD_PROP_LEFT_ATTACH:
CHILD_LEFT (grid_child) = g_value_get_int (value);
break;
case CHILD_PROP_TOP_ATTACH:
CHILD_TOP (grid_child) = g_value_get_int (value);
break;
case CHILD_PROP_WIDTH:
CHILD_WIDTH (grid_child) = g_value_get_int (value);
break;
case CHILD_PROP_HEIGHT:
CHILD_HEIGHT (grid_child) = g_value_get_int (value);
break;
default:
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
break;
}
if (gtk_widget_get_visible (child) &&
gtk_widget_get_visible (GTK_WIDGET (grid)))
gtk_widget_queue_resize (child);
}
static void
gtk_grid_init (GtkGrid *grid)
{
GtkGridPrivate *priv;
grid->priv = G_TYPE_INSTANCE_GET_PRIVATE (grid, GTK_TYPE_GRID, GtkGridPrivate);
priv = grid->priv;
gtk_widget_set_has_window (GTK_WIDGET (grid), FALSE);
gtk_widget_set_redraw_on_allocate (GTK_WIDGET (grid), FALSE);
priv->children = NULL;
priv->orientation = GTK_ORIENTATION_HORIZONTAL;
priv->linedata[0].spacing = 0;
priv->linedata[1].spacing = 0;
priv->linedata[0].homogeneous = FALSE;
priv->linedata[1].homogeneous = FALSE;
}
static void grid_attach (GtkGrid *grid,
GtkWidget *child,
gint left,
gint top,
gint width,
gint height);
static void
gtk_grid_add (GtkContainer *container,
GtkWidget *child)
{
GtkGrid *grid = GTK_GRID (container);
GtkGridPrivate *priv = grid->priv;
GtkGridChild *grid_child;
GtkGridChildAttach *attach;
GtkGridChildAttach *opposite;
GList *list;
gint pos;
pos = 0;
for (list = priv->children; list; list = list->next)
{
grid_child = list->data;
attach = &grid_child->attach[priv->orientation];
opposite = &grid_child->attach[1 - priv->orientation];
if (opposite->pos <= 0 && opposite->pos + opposite->span > 0)
pos = MAX (pos, attach->pos + attach->span);
}
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
grid_attach (grid, child, pos, 0, 1, 1);
else
grid_attach (grid, child, 0, pos, 1, 1);
}
static void
gtk_grid_remove (GtkContainer *container,
GtkWidget *child)
{
GtkGrid *grid = GTK_GRID (container);
GtkGridPrivate *priv = grid->priv;
GtkGridChild *grid_child;
GList *list;
for (list = priv->children; list; list = list->next)
{
grid_child = list->data;
if (grid_child->widget == child)
{
gboolean was_visible = gtk_widget_get_visible (child);
gtk_widget_unparent (child);
priv->children = g_list_remove (priv->children, grid_child);
g_slice_free (GtkGridChild, grid_child);
if (was_visible && gtk_widget_get_visible (GTK_WIDGET (grid)))
gtk_widget_queue_resize (GTK_WIDGET (grid));
break;
}
}
}
static void
gtk_grid_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkGrid *grid = GTK_GRID (container);
GtkGridPrivate *priv = grid->priv;
GtkGridChild *child;
GList *list;
list = priv->children;
while (list)
{
child = list->data;
list = list->next;
(* callback) (child->widget, callback_data);
}
}
static GType
gtk_grid_child_type (GtkContainer *container)
{
return GTK_TYPE_WIDGET;
}
/* Calculates the min and max numbers for both orientations.
*/
static void
gtk_grid_request_count_lines (GtkGridRequest *request)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridChild *child;
GtkGridChildAttach *attach;
GList *list;
gint min[2];
gint max[2];
min[0] = min[1] = G_MAXINT;
max[0] = max[1] = G_MININT;
for (list = priv->children; list; list = list->next)
{
child = list->data;
attach = child->attach;
min[0] = MIN (min[0], attach[0].pos);
max[0] = MAX (max[0], attach[0].pos + attach[0].span);
min[1] = MIN (min[1], attach[1].pos);
max[1] = MAX (max[1], attach[1].pos + attach[1].span);
}
request->lines[0].min = min[0];
request->lines[0].max = max[0];
request->lines[1].min = min[1];
request->lines[1].max = max[1];
}
/* Sets line sizes to 0 and marks lines as expand
* if they have a non-spanning expanding child.
*/
static void
gtk_grid_request_init (GtkGridRequest *request,
GtkOrientation orientation)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridChild *child;
GtkGridChildAttach *attach;
GtkGridLines *lines;
GList *list;
gint i;
lines = &request->lines[orientation];
for (i = 0; i < lines->max - lines->min; i++)
{
lines->lines[i].minimum = 0;
lines->lines[i].natural = 0;
lines->lines[i].expand = FALSE;
}
for (list = priv->children; list; list = list->next)
{
child = list->data;
attach = &child->attach[orientation];
if (attach->span == 1 && gtk_widget_compute_expand (child->widget, orientation))
lines->lines[attach->pos - lines->min].expand = TRUE;
}
}
/* Sums allocations for lines spanned by child and their spacing.
*/
static gint
compute_allocation_for_child (GtkGridRequest *request,
GtkGridChild *child,
GtkOrientation orientation)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridLineData *linedata;
GtkGridLines *lines;
GtkGridLine *line;
GtkGridChildAttach *attach;
gint size;
gint i;
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
attach = &child->attach[orientation];
size = (attach->span - 1) * linedata->spacing;
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
size += line->allocation;
}
return size;
}
static void
compute_request_for_child (GtkGridRequest *request,
GtkGridChild *child,
GtkOrientation orientation,
gboolean contextual,
gint *minimum,
gint *natural)
{
if (contextual)
{
gint size;
size = compute_allocation_for_child (request, child, 1 - orientation);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width_for_height (child->widget,
size,
minimum, natural);
else
gtk_widget_get_preferred_height_for_width (child->widget,
size,
minimum, natural);
}
else
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width (child->widget, minimum, natural);
else
gtk_widget_get_preferred_height (child->widget, minimum, natural);
}
}
/* Sets requisition to max. of non-spanning children.
* If contextual is TRUE, requires allocations of
* lines in the opposite orientation to be set.
*/
static void
gtk_grid_request_non_spanning (GtkGridRequest *request,
GtkOrientation orientation,
gboolean contextual)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridChild *child;
GtkGridChildAttach *attach;
GtkGridLines *lines;
GtkGridLine *line;
GList *list;
gint minimum;
gint natural;
lines = &request->lines[orientation];
for (list = priv->children; list; list = list->next)
{
child = list->data;
if (!gtk_widget_get_visible (child->widget))
continue;
attach = &child->attach[orientation];
if (attach->span != 1)
continue;
compute_request_for_child (request, child, orientation, contextual, &minimum, &natural);
line = &lines->lines[attach->pos - lines->min];
line->minimum = MAX (line->minimum, minimum);
line->natural = MAX (line->natural, natural);
}
}
/* Enforce homogeneous sizes.
*/
static void
gtk_grid_request_homogeneous (GtkGridRequest *request,
GtkOrientation orientation)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridLineData *linedata;
GtkGridLines *lines;
gint minimum, natural;
gint i;
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
if (!linedata->homogeneous)
return;
minimum = 0;
natural = 0;
for (i = 0; i < lines->max - lines->min; i++)
{
minimum = MAX (minimum, lines->lines[i].minimum);
natural = MAX (natural, lines->lines[i].natural);
}
for (i = 0; i < lines->max - lines->min; i++)
{
lines->lines[i].minimum = minimum;
lines->lines[i].natural = natural;
}
}
/* Deals with spanning children.
* Requires expand fields of lines to be set for
* non-spanning children.
*/
static void
gtk_grid_request_spanning (GtkGridRequest *request,
GtkOrientation orientation,
gboolean contextual)
{
GtkGridPrivate *priv = request->grid->priv;
GList *list;
GtkGridChild *child;
GtkGridChildAttach *attach;
GtkGridLineData *linedata;
GtkGridLines *lines;
GtkGridLine *line;
gint minimum;
gint natural;
gint span_minimum;
gint span_natural;
gint span_expand;
gboolean force_expand;
gint extra;
gint expand;
gint line_extra;
gint i;
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
for (list = priv->children; list; list = list->next)
{
child = list->data;
if (!gtk_widget_get_visible (child->widget))
continue;
attach = &child->attach[orientation];
if (attach->span == 1)
continue;
compute_request_for_child (request, child, orientation, contextual, &minimum, &natural);
span_minimum = (attach->span - 1) * linedata->spacing;
span_natural = (attach->span - 1) * linedata->spacing;
span_expand = 0;
force_expand = FALSE;
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
span_minimum += line->minimum;
span_natural += line->natural;
if (line->expand)
span_expand += 1;
}
if (span_expand == 0)
{
span_expand = attach->span;
force_expand = TRUE;
}
/* If we need to request more space for this child to fill
* its requisition, then divide up the needed space amongst the
* lines it spans, favoring expandable lines if any.
*/
if (span_minimum < minimum)
{
extra = minimum - span_minimum;
expand = span_expand;
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
if (force_expand || line->expand)
{
line_extra = extra / expand;
line->minimum += line_extra;
extra -= line_extra;
expand -= 1;
}
}
}
if (span_natural < natural)
{
extra = natural - span_natural;
expand = span_expand;
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
if (force_expand || line->expand)
{
line_extra = extra / expand;
line->natural += line_extra;
extra -= line_extra;
expand -= 1;
}
}
}
}
}
/* Marks empty and expanding lines and counts them.
*/
static void
gtk_grid_request_compute_expand (GtkGridRequest *request,
GtkOrientation orientation,
gint *nonempty_lines,
gint *expand_lines)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridChild *child;
GtkGridChildAttach *attach;
GList *list;
gint i;
GtkGridLines *lines;
GtkGridLine *line;
gboolean has_expand;
gint expand;
gint empty;
lines = &request->lines[orientation];
for (i = 0; i < lines->max - lines->min; i++)
{
lines->lines[i].need_expand = FALSE;
lines->lines[i].expand = FALSE;
lines->lines[i].empty = TRUE;
}
for (list = priv->children; list; list = list->next)
{
child = list->data;
if (!gtk_widget_get_visible (child->widget))
continue;
attach = &child->attach[orientation];
if (attach->span != 1)
continue;
line = &lines->lines[attach->pos - lines->min];
line->empty = FALSE;
if (gtk_widget_compute_expand (child->widget, orientation))
line->expand = TRUE;
}
for (list = priv->children; list; list = list->next)
{
child = list->data;
if (!gtk_widget_get_visible (child->widget))
continue;
attach = &child->attach[orientation];
if (attach->span == 1)
continue;
has_expand = FALSE;
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
line->empty = FALSE;
if (line->expand)
has_expand = TRUE;
}
if (!has_expand && gtk_widget_compute_expand (child->widget, orientation))
{
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
line->need_expand = TRUE;
}
}
}
empty = 0;
expand = 0;
for (i = 0; i < lines->max - lines->min; i++)
{
line = &lines->lines[i];
if (line->need_expand)
line->expand = TRUE;
if (line->empty)
empty += 1;
if (line->expand)
expand += 1;
}
if (nonempty_lines)
*nonempty_lines = lines->max - lines->min - empty;
if (expand_lines)
*expand_lines = expand;
}
/* Sums the minimum and natural fields of lines and their spacing.
*/
static void
gtk_grid_request_sum (GtkGridRequest *request,
GtkOrientation orientation,
gint *minimum,
gint *natural)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridLineData *linedata;
GtkGridLines *lines;
gint i;
gint min, nat;
gint nonempty;
gtk_grid_request_compute_expand (request, orientation, &nonempty, NULL);
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
min = (nonempty - 1) * linedata->spacing;
nat = (nonempty - 1) * linedata->spacing;
for (i = 0; i < lines->max - lines->min; i++)
{
min += lines->lines[i].minimum;
nat += lines->lines[i].natural;
}
if (minimum)
*minimum = min;
if (natural)
*natural = nat;
}
/* Computes minimum and natural fields of lines.
* When contextual is TRUE, requires allocation of
* lines in the opposite orientation to be set.
*/
static void
gtk_grid_request_run (GtkGridRequest *request,
GtkOrientation orientation,
gboolean contextual)
{
gtk_grid_request_init (request, orientation);
gtk_grid_request_non_spanning (request, orientation, contextual);
gtk_grid_request_homogeneous (request, orientation);
gtk_grid_request_spanning (request, orientation, contextual);
gtk_grid_request_homogeneous (request, orientation);
}
/* Requires that the minimum and natural fields of lines
* have been set, computes the allocation field of lines
* by distributing total_size among lines.
*/
static void
gtk_grid_request_allocate (GtkGridRequest *request,
GtkOrientation orientation,
gint total_size)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridLineData *linedata;
GtkGridLines *lines;
GtkGridLine *line;
gint nonempty;
gint expand;
gint i, j;
GtkRequestedSize *sizes;
gint extra;
gint rest;
gint size;
gtk_grid_request_compute_expand (request, orientation, &nonempty, &expand);
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
size = total_size - (nonempty - 1) * linedata->spacing;
if (linedata->homogeneous)
{
extra = size / nonempty;
rest = size % nonempty;
for (i = 0; i < lines->max - lines->min; i++)
{
line = &lines->lines[i];
if (line->empty)
continue;
line->allocation = extra;
if (rest > 0)
{
line->allocation += 1;
rest -= 1;
}
}
}
else
{
sizes = g_newa (GtkRequestedSize, nonempty);
j = 0;
for (i = 0; i < lines->max - lines->min; i++)
{
line = &lines->lines[i];
if (line->empty)
continue;
size -= line->minimum;
sizes[j].minimum_size = line->minimum;
sizes[j].natural_size = line->natural;
sizes[j].data = line;
j++;
}
size = gtk_distribute_natural_allocation (MAX (0, size), nonempty, sizes);
if (expand > 0)
{
extra = size / expand;
rest = size % expand;
}
else
{
extra = 0;
rest = 0;
}
j = 0;
for (i = 0; i < lines->max - lines->min; i++)
{
line = &lines->lines[i];
if (line->empty)
continue;
g_assert (line == sizes[j].data);
line->allocation = sizes[j].minimum_size;
if (line->expand)
{
line->allocation += extra;
if (rest > 0)
{
line->allocation += 1;
rest -= 1;
}
}
j++;
}
}
}
/* Computes the position fields from allocation and spacing.
*/
static void
gtk_grid_request_position (GtkGridRequest *request,
GtkOrientation orientation)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridLineData *linedata;
GtkGridLines *lines;
GtkGridLine *line;
gint position;
gint i;
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
position = 0;
for (i = 0; i < lines->max - lines->min; i++)
{
line = &lines->lines[i];
if (!line->empty)
{
line->position = position;
position += line->allocation + linedata->spacing;
}
}
}
static void
gtk_grid_get_size (GtkGrid *grid,
GtkOrientation orientation,
gint *minimum,
gint *natural)
{
GtkGridRequest request;
GtkGridLines *lines;
request.grid = grid;
gtk_grid_request_count_lines (&request);
lines = &request.lines[orientation];
lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
gtk_grid_request_run (&request, orientation, FALSE);
gtk_grid_request_sum (&request, orientation, minimum, natural);
}
static void
gtk_grid_get_size_for_size (GtkGrid *grid,
GtkOrientation orientation,
gint size,
gint *minimum,
gint *natural)
{
GtkGridRequest request;
GtkGridLines *lines;
gint min_size;
request.grid = grid;
gtk_grid_request_count_lines (&request);
lines = &request.lines[0];
lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
lines = &request.lines[1];
lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
gtk_grid_request_run (&request, 1 - orientation, FALSE);
gtk_grid_request_sum (&request, 1 - orientation, &min_size, NULL);
gtk_grid_request_allocate (&request, 1 - orientation, MAX (size, min_size));
gtk_grid_request_run (&request, orientation, TRUE);
gtk_grid_request_sum (&request, orientation, minimum, natural);
}
static void
gtk_grid_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkGrid *grid = GTK_GRID (widget);
if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT)
gtk_grid_get_size_for_size (grid, GTK_ORIENTATION_HORIZONTAL, 0, minimum, natural);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_HORIZONTAL, minimum, natural);
}
static void
gtk_grid_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkGrid *grid = GTK_GRID (widget);
if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
gtk_grid_get_size_for_size (grid, GTK_ORIENTATION_VERTICAL, 0, minimum, natural);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_VERTICAL, minimum, natural);
}
static void
gtk_grid_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum,
gint *natural)
{
GtkGrid *grid = GTK_GRID (widget);
if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT)
gtk_grid_get_size_for_size (grid, GTK_ORIENTATION_HORIZONTAL, height, minimum, natural);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_HORIZONTAL, minimum, natural);
}
static void
gtk_grid_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum,
gint *natural)
{
GtkGrid *grid = GTK_GRID (widget);
if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
gtk_grid_get_size_for_size (grid, GTK_ORIENTATION_VERTICAL, width, minimum, natural);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_VERTICAL, minimum, natural);
}
static void
allocate_child (GtkGridRequest *request,
GtkOrientation orientation,
GtkGridChild *child,
gint *position,
gint *size)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridLineData *linedata;
GtkGridLines *lines;
GtkGridLine *line;
GtkGridChildAttach *attach;
gint i;
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
attach = &child->attach[orientation];
*position = lines->lines[attach->pos - lines->min].position;
*size = (attach->span - 1) * linedata->spacing;
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
*size += line->allocation;
}
}
static void
gtk_grid_request_allocate_children (GtkGridRequest *request)
{
GtkGridPrivate *priv = request->grid->priv;
GList *list;
GtkGridChild *child;
GtkAllocation allocation;
GtkAllocation child_allocation;
gint x, y, width, height;
gtk_widget_get_allocation (GTK_WIDGET (request->grid), &allocation);
for (list = priv->children; list; list = list->next)
{
child = list->data;
if (!gtk_widget_get_visible (child->widget))
continue;
allocate_child (request, GTK_ORIENTATION_HORIZONTAL, child, &x, &width);
allocate_child (request, GTK_ORIENTATION_VERTICAL, child, &y, &height);
child_allocation.x = allocation.x + x;
child_allocation.y = allocation.y + y;
child_allocation.width = MAX (1, width);
child_allocation.height = MAX (1, height);
if (gtk_widget_get_direction (GTK_WIDGET (request->grid)) == GTK_TEXT_DIR_RTL)
child_allocation.x = allocation.x + allocation.width
- (child_allocation.x - allocation.x) - child_allocation.width;
gtk_widget_size_allocate (child->widget, &child_allocation);
}
}
#define GET_SIZE(allocation, orientation) (orientation == GTK_ORIENTATION_HORIZONTAL ? allocation->width : allocation->height)
static void
gtk_grid_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkGrid *grid = GTK_GRID (widget);
GtkGridPrivate *priv = grid->priv;
GtkGridRequest request;
GtkGridLines *lines;
request.grid = grid;
gtk_grid_request_count_lines (&request);
lines = &request.lines[0];
lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
lines = &request.lines[1];
lines->lines = g_newa (GtkGridLine, lines->max - lines->min);
memset (lines->lines, 0, (lines->max - lines->min) * sizeof (GtkGridLine));
gtk_widget_set_allocation (widget, allocation);
gtk_grid_request_run (&request, 1 - priv->orientation, FALSE);
gtk_grid_request_allocate (&request, 1 - priv->orientation, GET_SIZE (allocation, 1 - priv->orientation));
gtk_grid_request_run (&request, priv->orientation, TRUE);
gtk_grid_request_allocate (&request, priv->orientation, GET_SIZE (allocation, priv->orientation));
gtk_grid_request_position (&request, 0);
gtk_grid_request_position (&request, 1);
gtk_grid_request_allocate_children (&request);
}
static void
gtk_grid_class_init (GtkGridClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (class);
object_class->get_property = gtk_grid_get_property;
object_class->set_property = gtk_grid_set_property;
widget_class->size_allocate = gtk_grid_size_allocate;
widget_class->get_preferred_width = gtk_grid_get_preferred_width;
widget_class->get_preferred_height = gtk_grid_get_preferred_height;
widget_class->get_preferred_width_for_height = gtk_grid_get_preferred_width_for_height;
widget_class->get_preferred_height_for_width = gtk_grid_get_preferred_height_for_width;
container_class->add = gtk_grid_add;
container_class->remove = gtk_grid_remove;
container_class->forall = gtk_grid_forall;
container_class->child_type = gtk_grid_child_type;
container_class->set_child_property = gtk_grid_set_child_property;
container_class->get_child_property = gtk_grid_get_child_property;
gtk_container_class_handle_border_width (container_class);
g_object_class_override_property (object_class, PROP_ORIENTATION, "orientation");
g_object_class_install_property (object_class, PROP_ROW_SPACING,
g_param_spec_int ("row-spacing",
P_("Row spacing"),
P_("The amount of space between two consecutive rows"),
0, G_MAXINT16, 0,
GTK_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_COLUMN_SPACING,
g_param_spec_int ("column-spacing",
P_("Column spacing"),
P_("The amount of space between two consecutive columns"),
0, G_MAXINT16, 0,
GTK_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_ROW_HOMOGENEOUS,
g_param_spec_boolean ("row-homogeneous",
P_("Row Homogeneous"),
P_("If TRUE, the rows are all the same height"),
FALSE,
GTK_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_COLUMN_HOMOGENEOUS,
g_param_spec_boolean ("column-homogeneous",
P_("Column Homogeneous"),
P_("If TRUE, the columns are all the same width"),
FALSE,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class, CHILD_PROP_LEFT_ATTACH,
g_param_spec_int ("left-attach",
P_("Left attachment"),
P_("The column number to attach the left side of the child to"),
G_MININT, G_MAXINT, 0,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class, CHILD_PROP_TOP_ATTACH,
g_param_spec_int ("top-attach",
P_("Top attachment"),
P_("The row number to attach the top side of a child widget to"),
G_MININT, G_MAXINT, 0,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class, CHILD_PROP_WIDTH,
g_param_spec_int ("width",
P_("Width"),
P_("The number of columns that a child spans"),
1, G_MAXINT, 1,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class, CHILD_PROP_HEIGHT,
g_param_spec_int ("height",
P_("Height"),
P_("The number of rows that a child spans"),
1, G_MAXINT, 1,
GTK_PARAM_READWRITE));
g_type_class_add_private (class, sizeof (GtkGridPrivate));
}
/**
* gtk_grid_new:
*
* Creates a new grid widget.
*
* Returns: the new #GtkGrid
*/
GtkWidget *
gtk_grid_new (void)
{
return g_object_new (GTK_TYPE_GRID, NULL);
}
static void
grid_attach (GtkGrid *grid,
GtkWidget *widget,
gint left,
gint top,
gint width,
gint height)
{
GtkGridPrivate *priv = grid->priv;
GtkGridChild *child;
child = g_slice_new (GtkGridChild);
child->widget = widget;
CHILD_LEFT (child) = left;
CHILD_TOP (child) = top;
CHILD_WIDTH (child) = width;
CHILD_HEIGHT (child) = height;
priv->children = g_list_prepend (priv->children, child);
gtk_widget_set_parent (widget, GTK_WIDGET (grid));
}
/**
* gtk_grid_attach:
* @grid: a #GtkGrid
* @child: the widget to add
* @left: the column number to attach the left side of @child to
* @top: the row number to attach the top side of @child to
* @width: the number of columns that @child will span
* @height: the number of rows that @child will span
*
* Adds a widget to the grid.
*
* The position of @child is determined by @left and @top. The
* number of 'cells' that @child will occupy is determined by
* @width and @height.
*/
void
gtk_grid_attach (GtkGrid *grid,
GtkWidget *child,
gint left,
gint top,
gint width,
gint height)
{
g_return_if_fail (GTK_IS_GRID (grid));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (gtk_widget_get_parent (child) == NULL);
g_return_if_fail (width > 0);
g_return_if_fail (height > 0);
grid_attach (grid, child, left, top, width, height);
}
/**
* gtk_grid_attach_next_to:
* @grid: a #GtkGrid
* @child: the widget to add
* @sibling: the child of @grid that @child will be placed next to
* @side: the side of @sibling that @child is positioned next to
* @width: the number of columns that @child will span
* @height: the number of rows that @child will span
*
* Adds a widget to the grid.
*
* The widget is placed next to @sibling, on the side determined by
* @side.
*/
void
gtk_grid_attach_next_to (GtkGrid *grid,
GtkWidget *child,
GtkWidget *sibling,
GtkPositionType side,
gint width,
gint height)
{
GtkGridChild *grid_sibling;
gint left, top;
g_return_if_fail (GTK_IS_GRID (grid));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (gtk_widget_get_parent (child) == NULL);
g_return_if_fail (gtk_widget_get_parent (sibling) == (GtkWidget*)grid);
g_return_if_fail (width > 0);
g_return_if_fail (height > 0);
grid_sibling = find_grid_child (grid, sibling);
switch (side)
{
case GTK_POS_LEFT:
left = CHILD_LEFT (grid_sibling) - width;
top = CHILD_TOP (grid_sibling);
break;
case GTK_POS_RIGHT:
left = CHILD_LEFT (grid_sibling) + CHILD_WIDTH (grid_sibling);
top = CHILD_TOP (grid_sibling);
break;
case GTK_POS_TOP:
left = CHILD_LEFT (grid_sibling);
top = CHILD_TOP (grid_sibling) - height;
break;
case GTK_POS_BOTTOM:
left = CHILD_LEFT (grid_sibling);
top = CHILD_TOP (grid_sibling) + CHILD_HEIGHT (grid_sibling);
break;
default:
g_assert_not_reached ();
}
grid_attach (grid, child, left, top, width, height);
}
/**
* gtk_grid_set_row_homogeneous:
* @grid: a #GtkGrid
* @homogeneous: %TRUE to make rows homogeneous
*
* Sets whether all rows of @grid will have the same height.
*/
void
gtk_grid_set_row_homogeneous (GtkGrid *grid,
gboolean homogeneous)
{
GtkGridPrivate *priv;
g_return_if_fail (GTK_IS_GRID (grid));
priv = grid->priv;
if (ROWS (priv)->homogeneous != homogeneous)
{
ROWS (priv)->homogeneous = homogeneous;
if (gtk_widget_get_visible (GTK_WIDGET (grid)))
gtk_widget_queue_resize (GTK_WIDGET (grid));
g_object_notify (G_OBJECT (grid), "row-homogeneous");
}
}
/**
* gtk_grid_get_row_homogeneous:
* @grid: a #GtkGrid
*
* Returns whether all rows of @grid have the same height.
*
* Returns: whether all rows of @grid have the same height.
*/
gboolean
gtk_grid_get_row_homogeneous (GtkGrid *grid)
{
GtkGridPrivate *priv;
g_return_val_if_fail (GTK_IS_GRID (grid), FALSE);
priv = grid->priv;
return ROWS (priv)->homogeneous;
}
/**
* gtk_grid_set_column_homogeneous:
* @grid: a #GtkGrid
* @homogeneous: %TRUE to make columns homogeneous
*
* Sets whether all columns of @grid will have the same width.
*/
void
gtk_grid_set_column_homogeneous (GtkGrid *grid,
gboolean homogeneous)
{
GtkGridPrivate *priv;
g_return_if_fail (GTK_IS_GRID (grid));
priv = grid->priv;
if (COLUMNS (priv)->homogeneous != homogeneous)
{
COLUMNS (priv)->homogeneous = homogeneous;
if (gtk_widget_get_visible (GTK_WIDGET (grid)))
gtk_widget_queue_resize (GTK_WIDGET (grid));
g_object_notify (G_OBJECT (grid), "column-homogeneous");
}
}
/**
* gtk_grid_get_column_homogeneous:
* @grid: a #GtkGrid
*
* Returns whether all columns of @grid have the same width.
*
* Returns: whether all columns of @grid have the same width.
*/
gboolean
gtk_grid_get_column_homogeneous (GtkGrid *grid)
{
GtkGridPrivate *priv;
g_return_val_if_fail (GTK_IS_GRID (grid), FALSE);
priv = grid->priv;
return COLUMNS (priv)->homogeneous;
}
/**
* gtk_grid_set_row_spacing:
* @grid: a #GtkGrid
* @spacing: the amount of space to insert between rows
*
* Sets the amount of space between rows of @grid.
*/
void
gtk_grid_set_row_spacing (GtkGrid *grid,
guint spacing)
{
GtkGridPrivate *priv;
g_return_if_fail (GTK_IS_GRID (grid));
g_return_if_fail (spacing <= G_MAXINT16);
priv = grid->priv;
if (ROWS (priv)->spacing != spacing)
{
ROWS (priv)->spacing = spacing;
if (gtk_widget_get_visible (GTK_WIDGET (grid)))
gtk_widget_queue_resize (GTK_WIDGET (grid));
g_object_notify (G_OBJECT (grid), "row-spacing");
}
}
/**
* gtk_grid_get_row_spacing:
* @grid: a #GtkGrid
*
* Returns the amount of space between the rows of @grid.
*
* Returns: the row spacing of @grid
*/
guint
gtk_grid_get_row_spacing (GtkGrid *grid)
{
GtkGridPrivate *priv;
g_return_val_if_fail (GTK_IS_GRID (grid), 0);
priv = grid->priv;
return ROWS (priv)->spacing;
}
/**
* gtk_grid_set_column_spacing:
* @grid: a #GtkGrid
* @spacing: the amount of space to insert between columns
*
* Sets the amount of space between columns of @grid.
*/
void
gtk_grid_set_column_spacing (GtkGrid *grid,
guint spacing)
{
GtkGridPrivate *priv;
g_return_if_fail (GTK_IS_GRID (grid));
g_return_if_fail (spacing <= G_MAXINT16);
priv = grid->priv;
if (COLUMNS (priv)->spacing != spacing)
{
COLUMNS (priv)->spacing = spacing;
if (gtk_widget_get_visible (GTK_WIDGET (grid)))
gtk_widget_queue_resize (GTK_WIDGET (grid));
g_object_notify (G_OBJECT (grid), "column-spacing");
}
}
/**
* gtk_grid_get_column_spacing:
* @grid: a #GtkGrid
*
* Returns the amount of space between the columns of @grid.
*
* Returns: the column spacing of @grid
*/
guint
gtk_grid_get_column_spacing (GtkGrid *grid)
{
GtkGridPrivate *priv;
g_return_val_if_fail (GTK_IS_GRID (grid), 0);
priv = grid->priv;
return COLUMNS (priv)->spacing;
}
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