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gtk2/gtk/gtkgrid.c

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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, see <http://www.gnu.org/licenses/>.
*/
#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(). The behaviour of
* GtkGrid when several children occupy the same grid cell is undefined.
*
* 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 _GtkGridRowProperties GtkGridRowProperties;
typedef struct _GtkGridLine GtkGridLine;
typedef struct _GtkGridLines GtkGridLines;
typedef struct _GtkGridLineData GtkGridLineData;
typedef struct _GtkGridRequest GtkGridRequest;
struct _GtkGridChildAttach
{
gint pos;
gint span;
};
struct _GtkGridRowProperties
{
gint row;
GtkBaselinePosition baseline_position;
};
static const GtkGridRowProperties gtk_grid_row_properties_default = {
0,
GTK_BASELINE_POSITION_CENTER
};
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;
GList *row_properties;
GtkOrientation orientation;
gint baseline_row;
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 minimum_above;
gint minimum_below;
gint natural_above;
gint natural_below;
gint position;
gint allocation;
gint allocated_baseline;
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,
PROP_BASELINE_ROW
};
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_ADD_PRIVATE (GtkGrid)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))
static void gtk_grid_row_properties_free (GtkGridRowProperties *props);
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, COLUMNS (priv)->spacing);
break;
case PROP_COLUMN_SPACING:
g_value_set_int (value, ROWS (priv)->spacing);
break;
case PROP_ROW_HOMOGENEOUS:
g_value_set_boolean (value, COLUMNS (priv)->homogeneous);
break;
case PROP_COLUMN_HOMOGENEOUS:
g_value_set_boolean (value, ROWS (priv)->homogeneous);
break;
case PROP_BASELINE_ROW:
g_value_set_int (value, priv->baseline_row);
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;
case PROP_BASELINE_ROW:
gtk_grid_set_baseline_row (grid, g_value_get_int (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 = gtk_grid_get_instance_private (grid);
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->baseline_row = 0;
priv->linedata[0].spacing = 0;
priv->linedata[1].spacing = 0;
priv->linedata[0].homogeneous = FALSE;
priv->linedata[1].homogeneous = FALSE;
}
static void
gtk_grid_finalize (GObject *object)
{
GtkGrid *grid = GTK_GRID (object);
GtkGridPrivate *priv = grid->priv;
g_list_free_full (priv->row_properties, (GDestroyNotify)gtk_grid_row_properties_free);
G_OBJECT_CLASS (gtk_grid_parent_class)->finalize (object);
}
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));
}
/* Find the position 'touching' existing
* children. @orientation and @max determine
* from which direction to approach (horizontal
* + max = right, vertical + !max = top, etc).
* @op_pos, @op_span determine the rows/columns
* in which the touching has to happen.
*/
static gint
find_attach_position (GtkGrid *grid,
GtkOrientation orientation,
gint op_pos,
gint op_span,
gboolean max)
{
GtkGridPrivate *priv = grid->priv;
GtkGridChild *grid_child;
GtkGridChildAttach *attach;
GtkGridChildAttach *opposite;
GList *list;
gint pos;
gboolean hit;
if (max)
pos = -G_MAXINT;
else
pos = G_MAXINT;
hit = FALSE;
for (list = priv->children; list; list = list->next)
{
grid_child = list->data;
attach = &grid_child->attach[orientation];
opposite = &grid_child->attach[1 - orientation];
/* check if the ranges overlap */
if (opposite->pos <= op_pos + op_span && op_pos <= opposite->pos + opposite->span)
{
hit = TRUE;
if (max)
pos = MAX (pos, attach->pos + attach->span);
else
pos = MIN (pos, attach->pos);
}
}
if (!hit)
pos = 0;
return pos;
}
static void
gtk_grid_add (GtkContainer *container,
GtkWidget *child)
{
GtkGrid *grid = GTK_GRID (container);
GtkGridPrivate *priv = grid->priv;
gint pos[2] = { 0, 0 };
pos[priv->orientation] = find_attach_position (grid, priv->orientation, 0, 1, TRUE);
grid_attach (grid, child, pos[0], pos[1], 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].minimum_above = -1;
lines->lines[i].minimum_below = -1;
lines->lines[i].natural_above = -1;
lines->lines[i].natural_below = -1;
lines->lines[i].expand = FALSE;
lines->lines[i].empty = TRUE;
}
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,
gint *minimum_baseline,
gint *natural_baseline)
{
if (minimum_baseline)
*minimum_baseline = -1;
if (natural_baseline)
*natural_baseline = -1;
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_and_baseline_for_width (child->widget,
size,
minimum, natural,
minimum_baseline, natural_baseline);
}
else
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width (child->widget, minimum, natural);
else
gtk_widget_get_preferred_height_and_baseline_for_width (child->widget,
-1,
minimum, natural,
minimum_baseline, natural_baseline);
}
}
/* 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 i;
GtkBaselinePosition baseline_pos;
gint minimum, minimum_baseline;
gint natural, natural_baseline;
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, &minimum_baseline, &natural_baseline);
line = &lines->lines[attach->pos - lines->min];
if (minimum_baseline != -1)
{
line->minimum_above = MAX (line->minimum_above, minimum_baseline);
line->minimum_below = MAX (line->minimum_below, minimum - minimum_baseline);
line->natural_above = MAX (line->natural_above, natural_baseline);
line->natural_below = MAX (line->natural_below, natural - natural_baseline);
}
else
{
line->minimum = MAX (line->minimum, minimum);
line->natural = MAX (line->natural, natural);
}
}
for (i = 0; i < lines->max - lines->min; i++)
{
line = &lines->lines[i];
if (line->minimum_above != -1)
{
line->minimum = MAX (line->minimum, line->minimum_above + line->minimum_below);
line->natural = MAX (line->natural, line->natural_above + line->natural_below);
baseline_pos = gtk_grid_get_row_baseline_position (request->grid, i + lines->min);
switch (baseline_pos)
{
case GTK_BASELINE_POSITION_TOP:
line->minimum_above += 0;
line->minimum_below += line->minimum - (line->minimum_above + line->minimum_below);
line->natural_above += 0;
line->natural_below += line->natural - (line->natural_above + line->natural_below);
break;
case GTK_BASELINE_POSITION_CENTER:
line->minimum_above += (line->minimum - (line->minimum_above + line->minimum_below))/2;
line->minimum_below += (line->minimum - (line->minimum_above + line->minimum_below))/2;
line->natural_above += (line->natural - (line->natural_above + line->natural_below))/2;
line->natural_below += (line->natural - (line->natural_above + line->natural_below))/2;
break;
case GTK_BASELINE_POSITION_BOTTOM:
line->minimum_above += line->minimum - (line->minimum_above + line->minimum_below);
line->minimum_below += 0;
line->natural_above += line->natural - (line->natural_above + line->natural_below);
line->natural_below += 0;
break;
}
}
}
}
/* 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;
/* TODO: Do we want to adjust the baseline here too?
And if so, also in the homogenous resize. */
}
}
/* 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;
/* We ignore baselines for spanning children */
compute_request_for_child (request, child, orientation, contextual, &minimum, &natural, NULL, NULL);
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.
*
* When doing homogeneous allocation though, try to keep the
* line allocations even, since we're going to force them to
* be the same anyway, and we don't want to introduce unnecessary
* extra space.
*/
if (span_minimum < minimum)
{
if (linedata->homogeneous)
{
gint total, m;
total = minimum - (attach->span - 1) * linedata->spacing;
m = total / attach->span + (total % attach->span ? 1 : 0);
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
line->minimum = MAX(line->minimum, m);
}
}
else
{
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)
{
if (linedata->homogeneous)
{
gint total, n;
total = natural - (attach->span - 1) * linedata->spacing;
n = total / attach->span + (total % attach->span ? 1 : 0);
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
line->natural = MAX(line->natural, n);
}
}
else
{
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 min,
gint max,
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];
min = MAX (min, lines->min);
max = MIN (max, lines->max);
for (i = min - lines->min; i < 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;
if (attach->pos >= max || attach->pos < min)
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];
if (line->expand)
has_expand = TRUE;
if (attach->pos + i >= max || attach->pos + 1 < min)
continue;
line->empty = FALSE;
}
if (!has_expand && gtk_widget_compute_expand (child->widget, orientation))
{
for (i = 0; i < attach->span; i++)
{
if (attach->pos + i >= max || attach->pos + 1 < min)
continue;
line = &lines->lines[attach->pos - lines->min + i];
line->need_expand = TRUE;
}
}
}
empty = 0;
expand = 0;
for (i = min - lines->min; i < 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 = max - 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,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkGridPrivate *priv = request->grid->priv;
GtkGridLineData *linedata;
GtkGridLines *lines;
gint i;
gint min, nat;
gint nonempty;
gtk_grid_request_compute_expand (request, orientation, G_MININT, G_MAXINT, &nonempty, NULL);
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
min = 0;
nat = 0;
for (i = 0; i < lines->max - lines->min; i++)
{
if (orientation == GTK_ORIENTATION_VERTICAL &&
lines->min + i == priv->baseline_row &&
lines->lines[i].minimum_above != -1)
{
if (minimum_baseline)
*minimum_baseline = min + lines->lines[i].minimum_above;
if (natural_baseline)
*natural_baseline = nat + lines->lines[i].natural_above;
}
min += lines->lines[i].minimum;
nat += lines->lines[i].natural;
if (!lines->lines[i].empty)
{
min += linedata->spacing;
nat += linedata->spacing;
}
}
/* Remove last spacing, if any was applied */
if (nonempty > 0)
{
min -= linedata->spacing;
nat -= linedata->spacing;
}
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);
}
static void
gtk_grid_distribute_non_homogeneous (GtkGridLines *lines,
gint nonempty,
gint expand,
gint size,
gint min,
gint max)
{
GtkRequestedSize *sizes;
GtkGridLine *line;
gint extra;
gint rest;
int i, j;
if (nonempty == 0)
return;
sizes = g_newa (GtkRequestedSize, nonempty);
j = 0;
for (i = min - lines->min; i < 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 = min - lines->min; i < 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++;
}
}
/* 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 nonempty1, nonempty2;
gint expand1, expand2;
gint i;
GtkBaselinePosition baseline_pos;
gint baseline;
gint extra, extra2;
gint rest;
gint size1, size2;
gint split, split_pos;
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
baseline = gtk_widget_get_allocated_baseline (GTK_WIDGET (request->grid));
if (orientation == GTK_ORIENTATION_VERTICAL && baseline != -1 &&
priv->baseline_row >= lines->min && priv->baseline_row < lines->max &&
lines->lines[priv->baseline_row - lines->min].minimum_above != -1)
{
split = priv->baseline_row;
split_pos = baseline - lines->lines[priv->baseline_row - lines->min].minimum_above;
gtk_grid_request_compute_expand (request, orientation, lines->min, split, &nonempty1, &expand1);
gtk_grid_request_compute_expand (request, orientation, split, lines->max, &nonempty2, &expand2);
if (nonempty2 > 0)
{
size1 = split_pos - (nonempty1) * linedata->spacing;
size2 = (total_size - split_pos) - (nonempty2 - 1) * linedata->spacing;
}
else
{
size1 = total_size - (nonempty1 - 1) * linedata->spacing;
size2 = 0;
}
}
else
{
gtk_grid_request_compute_expand (request, orientation, lines->min, lines->max, &nonempty1, &expand1);
nonempty2 = expand2 = 0;
split = lines->max;
size1 = total_size - (nonempty1 - 1) * linedata->spacing;
size2 = 0;
}
if (nonempty1 == 0 && nonempty2 == 0)
return;
if (linedata->homogeneous)
{
if (nonempty1 > 0)
{
extra = size1 / nonempty1;
rest = size1 % nonempty1;
}
else
{
extra = 0;
rest = 0;
}
if (nonempty2 > 0)
{
extra2 = size2 / nonempty2;
if (extra2 < extra || nonempty1 == 0)
{
extra = extra2;
rest = size2 % nonempty2;
}
}
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
{
gtk_grid_distribute_non_homogeneous (lines,
nonempty1,
expand1,
size1,
lines->min,
split);
gtk_grid_distribute_non_homogeneous (lines,
nonempty2,
expand2,
size2,
split,
lines->max);
}
for (i = 0; i < lines->max - lines->min; i++)
{
line = &lines->lines[i];
if (line->empty)
continue;
if (line->minimum_above != -1)
{
/* Note: This is overridden in gtk_grid_request_position for the allocated baseline */
baseline_pos = gtk_grid_get_row_baseline_position (request->grid, i + lines->min);
switch (baseline_pos)
{
case GTK_BASELINE_POSITION_TOP:
line->allocated_baseline =
line->minimum_above;
break;
case GTK_BASELINE_POSITION_CENTER:
line->allocated_baseline =
line->minimum_above +
(line->allocation - (line->minimum_above + line->minimum_below)) / 2;
break;
case GTK_BASELINE_POSITION_BOTTOM:
line->allocated_baseline =
line->allocation - line->minimum_below;
break;
}
}
else
line->allocated_baseline = -1;
}
}
/* 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, old_position;
int allocated_baseline;
gint i, j;
linedata = &priv->linedata[orientation];
lines = &request->lines[orientation];
allocated_baseline = gtk_widget_get_allocated_baseline (GTK_WIDGET(request->grid));
position = 0;
for (i = 0; i < lines->max - lines->min; i++)
{
line = &lines->lines[i];
if (orientation == GTK_ORIENTATION_VERTICAL &&
i + lines->min == priv->baseline_row &&
allocated_baseline != -1 &&
lines->lines[i].minimum_above != -1)
{
old_position = position;
position = allocated_baseline - line->minimum_above;
/* Back-patch previous rows */
for (j = 0; j < i; j++)
{
if (!lines->lines[j].empty)
lines->lines[j].position += position - old_position;
}
}
if (!line->empty)
{
line->position = position;
position += line->allocation + linedata->spacing;
if (orientation == GTK_ORIENTATION_VERTICAL &&
i + lines->min == priv->baseline_row &&
allocated_baseline != -1 &&
lines->lines[i].minimum_above != -1)
line->allocated_baseline = allocated_baseline - line->position;
}
}
}
static void
gtk_grid_get_size (GtkGrid *grid,
GtkOrientation orientation,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkGridRequest request;
GtkGridLines *lines;
if (minimum)
*minimum = 0;
if (natural)
*natural = 0;
if (minimum_baseline)
*minimum_baseline = -1;
if (natural_baseline)
*natural_baseline = -1;
if (grid->priv->children == NULL)
return;
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,
minimum_baseline, natural_baseline);
}
static void
gtk_grid_get_size_for_size (GtkGrid *grid,
GtkOrientation orientation,
gint size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkGridRequest request;
GtkGridLines *lines;
gint min_size;
if (minimum)
*minimum = 0;
if (natural)
*natural = 0;
if (minimum_baseline)
*minimum_baseline = -1;
if (natural_baseline)
*natural_baseline = -1;
if (grid->priv->children == NULL)
return;
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, NULL, 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, minimum_baseline, natural_baseline);
}
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, NULL, NULL);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_HORIZONTAL, minimum, natural, NULL, NULL);
}
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, NULL, NULL);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_VERTICAL, minimum, natural, NULL, NULL);
}
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, NULL, NULL);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_HORIZONTAL, minimum, natural, NULL, NULL);
}
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, NULL, NULL);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_VERTICAL, minimum, natural, NULL, NULL);
}
static void
gtk_grid_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
gint width,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkGrid *grid = GTK_GRID (widget);
if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH && width != -1)
gtk_grid_get_size_for_size (grid, GTK_ORIENTATION_VERTICAL, width, minimum, natural, minimum_baseline, natural_baseline);
else
gtk_grid_get_size (grid, GTK_ORIENTATION_VERTICAL, minimum, natural, minimum_baseline, natural_baseline);
}
static void
allocate_child (GtkGridRequest *request,
GtkOrientation orientation,
GtkGridChild *child,
gint *position,
gint *size,
gint *baseline)
{
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;
if (attach->span == 1)
*baseline = lines->lines[attach->pos - lines->min].allocated_baseline;
else
*baseline = -1;
*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, baseline, ignore;
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, &ignore);
allocate_child (request, GTK_ORIENTATION_VERTICAL, child, &y, &height, &baseline);
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_with_baseline (child->widget, &child_allocation, baseline);
}
}
#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;
GtkOrientation orientation;
if (priv->children == NULL)
{
gtk_widget_set_allocation (widget, allocation);
return;
}
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);
if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT)
orientation = GTK_ORIENTATION_HORIZONTAL;
else
orientation = GTK_ORIENTATION_VERTICAL;
gtk_grid_request_run (&request, 1 - orientation, FALSE);
gtk_grid_request_allocate (&request, 1 - orientation, GET_SIZE (allocation, 1 - orientation));
gtk_grid_request_run (&request, orientation, TRUE);
gtk_grid_request_allocate (&request, orientation, GET_SIZE (allocation, 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;
object_class->finalize = gtk_grid_finalize;
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;
widget_class->get_preferred_height_and_baseline_for_width = gtk_grid_get_preferred_height_and_baseline_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));
g_object_class_install_property (object_class, PROP_BASELINE_ROW,
g_param_spec_int ("baseline-row",
P_("Baseline Row"),
P_("The row to align the to the baseline when valign is GTK_ALIGN_BASELINE"),
0, G_MAXINT, 0,
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));
}
/**
* 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);
}
/**
* 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: (allow-none): the child of @grid that @child will be placed
* next to, or %NULL to place @child at the beginning or end
* @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. When @sibling is %NULL, the widget is placed in row (for
* left or right placement) or column 0 (for top or bottom placement),
* at the end indicated by @side.
*
* Attaching widgets labeled [1], [2], [3] with @sibling == %NULL and
* @side == %GTK_POS_LEFT yields a layout of [3][2][1].
*/
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 (sibling == NULL || gtk_widget_get_parent (sibling) == (GtkWidget*)grid);
g_return_if_fail (width > 0);
g_return_if_fail (height > 0);
if (sibling)
{
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 ();
}
}
else
{
switch (side)
{
case GTK_POS_LEFT:
left = find_attach_position (grid, GTK_ORIENTATION_HORIZONTAL, 0, height, FALSE);
left -= width;
top = 0;
break;
case GTK_POS_RIGHT:
left = find_attach_position (grid, GTK_ORIENTATION_HORIZONTAL, 0, height, TRUE);
top = 0;
break;
case GTK_POS_TOP:
left = 0;
top = find_attach_position (grid, GTK_ORIENTATION_VERTICAL, 0, width, FALSE);
top -= height;
break;
case GTK_POS_BOTTOM:
left = 0;
top = find_attach_position (grid, GTK_ORIENTATION_VERTICAL, 0, width, TRUE);
break;
default:
g_assert_not_reached ();
}
}
grid_attach (grid, child, left, top, width, height);
}
/**
* gtk_grid_get_child_at:
* @grid: a #GtkGrid
* @left: the left edge of the cell
* @top: the top edge of the cell
*
* Gets the child of @grid whose area covers the grid
* cell whose upper left corner is at @left, @top.
*
* Returns: (transfer none): the child at the given position, or %NULL
*
* Since: 3.2
*/
GtkWidget *
gtk_grid_get_child_at (GtkGrid *grid,
gint left,
gint top)
{
GtkGridPrivate *priv;
GtkGridChild *child;
GList *list;
g_return_val_if_fail (GTK_IS_GRID (grid), NULL);
priv = grid->priv;
for (list = priv->children; list; list = list->next)
{
child = list->data;
if (CHILD_LEFT (child) <= left &&
CHILD_LEFT (child) + CHILD_WIDTH (child) > left &&
CHILD_TOP (child) <= top &&
CHILD_TOP (child) + CHILD_HEIGHT (child) > top)
return child->widget;
}
return NULL;
}
/**
* gtk_grid_insert_row:
* @grid: a #GtkGrid
* @position: the position to insert the row at
*
* Inserts a row at the specified position.
*
* Children which are attached at or below this position
* are moved one row down. Children which span across this
* position are grown to span the new row.
*
* Since: 3.2
*/
void
gtk_grid_insert_row (GtkGrid *grid,
gint position)
{
GtkGridPrivate *priv;
GtkGridChild *child;
GList *list;
gint top, height;
g_return_if_fail (GTK_IS_GRID (grid));
priv = grid->priv;
for (list = priv->children; list; list = list->next)
{
child = list->data;
top = CHILD_TOP (child);
height = CHILD_HEIGHT (child);
if (top >= position)
{
CHILD_TOP (child) = top + 1;
gtk_container_child_notify (GTK_CONTAINER (grid), child->widget, "top-attach");
}
else if (top + height > position)
{
CHILD_HEIGHT (child) = height + 1;
gtk_container_child_notify (GTK_CONTAINER (grid), child->widget, "height");
}
}
for (list = priv->row_properties; list != NULL; list = list->next)
{
GtkGridRowProperties *prop = list->data;
if (prop->row >= position)
prop->row += 1;
}
}
/**
* gtk_grid_remove_row:
* @grid: a #GtkGrid
* @position: the position of the row to remove
*
* Removes a row from the grid.
*
* Children that are placed in this row are removed,
* spanning children that overlap this row have their
* height reduced by one, and children below the row
* are moved up.
*
* Since: 3.10
*/
void
gtk_grid_remove_row (GtkGrid *grid,
gint position)
{
GtkGridPrivate *priv;
GtkGridChild *child;
GList *list;
gint top, height;
g_return_if_fail (GTK_IS_GRID (grid));
priv = grid->priv;
list = priv->children;
while (list)
{
child = list->data;
list = list->next;
top = CHILD_TOP (child);
height = CHILD_HEIGHT (child);
if (top <= position && top + height > position)
height--;
if (top > position)
top--;
if (height <= 0)
gtk_container_remove (GTK_CONTAINER (grid), child->widget);
else
gtk_container_child_set (GTK_CONTAINER (grid), child->widget,
"height", height,
"top-attach", top,
NULL);
}
}
/**
* gtk_grid_insert_column:
* @grid: a #GtkGrid
* @position: the position to insert the column at
*
* Inserts a column at the specified position.
*
* Children which are attached at or to the right of this position
* are moved one column to the right. Children which span across this
* position are grown to span the new column.
*
* Since: 3.2
*/
void
gtk_grid_insert_column (GtkGrid *grid,
gint position)
{
GtkGridPrivate *priv;
GtkGridChild *child;
GList *list;
gint left, width;
g_return_if_fail (GTK_IS_GRID (grid));
priv = grid->priv;
for (list = priv->children; list; list = list->next)
{
child = list->data;
left = CHILD_LEFT (child);
width = CHILD_WIDTH (child);
if (left >= position)
{
CHILD_LEFT (child) = left + 1;
gtk_container_child_notify (GTK_CONTAINER (grid), child->widget, "left-attach");
}
else if (left + width > position)
{
CHILD_WIDTH (child) = width + 1;
gtk_container_child_notify (GTK_CONTAINER (grid), child->widget, "width");
}
}
}
/**
* gtk_grid_remove_column:
* @grid: a #GtkGrid
* @position: the position of the column to remove
*
* Removes a column from the grid.
*
* Children that are placed in this column are removed,
* spanning children that overlap this column have their
* width reduced by one, and children after the column
* are moved to the left.
*
* Since: 3.10
*/
void
gtk_grid_remove_column (GtkGrid *grid,
gint position)
{
GtkGridPrivate *priv;
GtkGridChild *child;
GList *list;
gint left, width;
g_return_if_fail (GTK_IS_GRID (grid));
priv = grid->priv;
list = priv->children;
while (list)
{
child = list->data;
list = list->next;
left = CHILD_LEFT (child);
width = CHILD_WIDTH (child);
if (left <= position && left + width > position)
width--;
if (left > position)
left--;
if (width <= 0)
gtk_container_remove (GTK_CONTAINER (grid), child->widget);
else
gtk_container_child_set (GTK_CONTAINER (grid), child->widget,
"width", width,
"left-attach", left,
NULL);
}
}
/**
* gtk_grid_insert_next_to:
* @grid: a #GtkGrid
* @sibling: the child of @grid that the new row or column will be
* placed next to
* @side: the side of @sibling that @child is positioned next to
*
* Inserts a row or column at the specified position.
*
* The new row or column is placed next to @sibling, on the side
* determined by @side. If @side is %GTK_POS_TOP or %GTK_POS_BOTTOM,
* a row is inserted. If @side is %GTK_POS_LEFT of %GTK_POS_RIGHT,
* a column is inserted.
*
* Since: 3.2
*/
void
gtk_grid_insert_next_to (GtkGrid *grid,
GtkWidget *sibling,
GtkPositionType side)
{
GtkGridChild *child;
g_return_if_fail (GTK_IS_GRID (grid));
g_return_if_fail (GTK_IS_WIDGET (sibling));
g_return_if_fail (gtk_widget_get_parent (sibling) == (GtkWidget*)grid);
child = find_grid_child (grid, sibling);
switch (side)
{
case GTK_POS_LEFT:
gtk_grid_insert_column (grid, CHILD_LEFT (child));
break;
case GTK_POS_RIGHT:
gtk_grid_insert_column (grid, CHILD_LEFT (child) + CHILD_WIDTH (child));
break;
case GTK_POS_TOP:
gtk_grid_insert_row (grid, CHILD_TOP (child));
break;
case GTK_POS_BOTTOM:
gtk_grid_insert_row (grid, CHILD_TOP (child) + CHILD_HEIGHT (child));
break;
default:
g_assert_not_reached ();
}
}
/**
* 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;
/* Yes, homogeneous rows means all the columns have the same size */
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), "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 COLUMNS (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;
/* Yes, homogeneous columns means all the rows have the same size */
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), "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 ROWS (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 (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), "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 COLUMNS (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 (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), "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 ROWS (priv)->spacing;
}
static GtkGridRowProperties *
find_row_properties (GtkGrid *grid,
gint row)
{
GList *l;
for (l = grid->priv->row_properties; l != NULL; l = l->next)
{
GtkGridRowProperties *prop = l->data;
if (prop->row == row)
return prop;
}
return NULL;
}
static void
gtk_grid_row_properties_free (GtkGridRowProperties *props)
{
g_slice_free (GtkGridRowProperties, props);
}
static GtkGridRowProperties *
get_row_properties_or_create (GtkGrid *grid,
gint row)
{
GtkGridRowProperties *props;
GtkGridPrivate *priv = grid->priv;
props = find_row_properties (grid, row);
if (props)
return props;
props = g_slice_new (GtkGridRowProperties);
*props = gtk_grid_row_properties_default;
props->row = row;
priv->row_properties =
g_list_prepend (priv->row_properties, props);
return props;
}
static const GtkGridRowProperties *
get_row_properties_or_default (GtkGrid *grid,
gint row)
{
GtkGridRowProperties *props;
props = find_row_properties (grid, row);
if (props)
return props;
return &gtk_grid_row_properties_default;
}
/**
* gtk_grid_set_row_baseline_position:
* @grid: a #GtkGrid
* @row: a row index
* @pos: a #GtkBaselinePosition
*
* Sets how the baseline should be positioned on @row of the
* grid, in case that row is assigned more space than is requested.
*
* Since: 3.10
*/
void
gtk_grid_set_row_baseline_position (GtkGrid *grid,
gint row,
GtkBaselinePosition pos)
{
GtkGridRowProperties *props;
g_return_if_fail (GTK_IS_GRID (grid));
props = get_row_properties_or_create (grid, row);
if (props->baseline_position != pos)
{
props->baseline_position = pos;
if (gtk_widget_get_visible (GTK_WIDGET (grid)))
gtk_widget_queue_resize (GTK_WIDGET (grid));
}
}
/**
* gtk_grid_get_row_baseline_position:
* @grid: a #GtkGrid
* @row: a row index
*
* Returns the baseline position of @row as set
* by gtk_grid_set_row_baseline_position() or the default value
* %GTK_BASELINE_POSITION_CENTER.
*
* Returns: the baseline position of @row
*
* Since: 3.10
*/
GtkBaselinePosition
gtk_grid_get_row_baseline_position (GtkGrid *grid,
gint row)
{
const GtkGridRowProperties *props;
g_return_val_if_fail (GTK_IS_GRID (grid), GTK_BASELINE_POSITION_CENTER);
props = get_row_properties_or_default (grid, row);
return props->baseline_position;
}
/**
* gtk_grid_set_baseline_row:
* @grid: a #GtkGrid
* @row: the row index
*
* Sets which row defines the global baseline for the entire grid.
* Each row in the grid can have its own local baseline, but only
* one of those is global, meaning it will be the baseline in the
* parent of the @grid.
*
* Returns: the row index defining the global baseline
*
* Since: 3.10
*/
void
gtk_grid_set_baseline_row (GtkGrid *grid,
gint row)
{
GtkGridPrivate *priv;
g_return_if_fail (GTK_IS_GRID (grid));
priv = grid->priv;
if (priv->baseline_row != row)
{
priv->baseline_row = row;
if (gtk_widget_get_visible (GTK_WIDGET (grid)))
gtk_widget_queue_resize (GTK_WIDGET (grid));
g_object_notify (G_OBJECT (grid), "baseline-row");
}
}
/**
* gtk_grid_get_baseline_row:
* @grid: a #GtkGrid
*
* Returns which row defines the global baseline of @grid.
*
* Returns: the row index defining the global baseline
*
* Since: 3.10
*/
gint
gtk_grid_get_baseline_row (GtkGrid *grid)
{
GtkGridPrivate *priv;
g_return_val_if_fail (GTK_IS_GRID (grid), 0);
priv = grid->priv;
return priv->baseline_row;
}
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