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gtk2/gtk/gtkgrid.c
Matthias Clasen e999773566 grid: Convert docs 
Convert link format, add an example image, add
property annotations. General cleanup.
2021-03-11 16:37:33 +00:00

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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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include "gtkgrid.h"
#include "gtkbuildable.h"
#include "gtkcsspositionvalueprivate.h"
#include "gtkgridlayout.h"
#include "gtkintl.h"
#include "gtkorientable.h"
#include "gtkprivate.h"
#include "gtksizerequest.h"
#include "gtkcssnodeprivate.h"
#include "gtkwidgetprivate.h"
/**
* GtkGrid:
*
* `GtkGrid` is a container which arranges its child widgets in
* rows and columns.
*
* ![An example GtkGrid](grid.png)
*
* It supports arbitrary positions and horizontal/vertical spans.
*
* Children are added using [method@Gtk.Grid.attach]. They can span multiple
* rows or columns. It is also possible to add a child next to an existing
* child, using [method@Gtk.Grid.attach_next_to]. To remove a child from the
* grid, use [method@Gtk.Grid.remove].
*
* The behaviour of `GtkGrid` when several children occupy the same grid
* cell is undefined.
*
* # GtkGrid as GtkBuildable
*
* Every child in a `GtkGrid` has access to a custom [iface@Gtk.Buildable]
* element, called ´<layout>´. It can by used to specify a position in the
* grid and optionally spans. All properties that can be used in the ´<layout>´
* element are implemented by [class@Gtk.GridLayoutChild].
*
* It is implemented by `GtkWidget` using [class@Gtk.LayoutManager].
*
* To showcase it, here is a simple example:
*
* ```xml
* <object class="GtkGrid" id="my_grid">
* <child>
* <object class="GtkButton" id="button1">
* <property name="label">Button 1</property>
* <layout>
* <property name="column">0</property>
* <property name="row">0</property>
* </layout>
* </object>
* </child>
* <child>
* <object class="GtkButton" id="button2">
* <property name="label">Button 2</property>
* <layout>
* <property name="column">1</property>
* <property name="row">0</property>
* </layout>
* </object>
* </child>
* <child>
* <object class="GtkButton" id="button3">
* <property name="label">Button 3</property>
* <layout>
* <property name="column">2</property>
* <property name="row">0</property>
* <property name="row-span">2</property>
* </layout>
* </object>
* </child>
* <child>
* <object class="GtkButton" id="button4">
* <property name="label">Button 4</property>
* <layout>
* <property name="column">0</property>
* <property name="row">1</property>
* <property name="column-span">2</property>
* </layout>
* </object>
* </child>
* </object>
* ```
*
* It organizes the first two buttons side-by-side in one cell each.
* The third button is in the last column but spans across two rows.
* This is defined by the ´row-span´ property. The last button is
* located in the second row and spans across two columns, which is
* defined by the ´column-span´ property.
*
* # CSS nodes
*
* `GtkGrid` uses a single CSS node with name `grid`.
*
* # Accessibility
*
* `GtkGrid` uses the %GTK_ACCESSIBLE_ROLE_GROUP role.
*/
typedef struct
{
GtkLayoutManager *layout_manager;
GtkOrientation orientation;
} GtkGridPrivate;
enum
{
PROP_0,
PROP_ROW_SPACING,
PROP_COLUMN_SPACING,
PROP_ROW_HOMOGENEOUS,
PROP_COLUMN_HOMOGENEOUS,
PROP_BASELINE_ROW,
N_PROPERTIES,
/* GtkOrientable */
PROP_ORIENTATION
};
static void gtk_grid_buildable_iface_init (GtkBuildableIface *iface);
static GParamSpec *obj_properties[N_PROPERTIES] = { NULL, };
G_DEFINE_TYPE_WITH_CODE (GtkGrid, gtk_grid, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkGrid)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_grid_buildable_iface_init))
static void
gtk_grid_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkGrid *grid = GTK_GRID (object);
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
case PROP_ROW_SPACING:
g_value_set_int (value, gtk_grid_layout_get_row_spacing (GTK_GRID_LAYOUT (priv->layout_manager)));
break;
case PROP_COLUMN_SPACING:
g_value_set_int (value, gtk_grid_layout_get_column_spacing (GTK_GRID_LAYOUT (priv->layout_manager)));
break;
case PROP_ROW_HOMOGENEOUS:
g_value_set_boolean (value, gtk_grid_layout_get_row_homogeneous (GTK_GRID_LAYOUT (priv->layout_manager)));
break;
case PROP_COLUMN_HOMOGENEOUS:
g_value_set_boolean (value, gtk_grid_layout_get_column_homogeneous (GTK_GRID_LAYOUT (priv->layout_manager)));
break;
case PROP_BASELINE_ROW:
g_value_set_int (value, gtk_grid_layout_get_baseline_row (GTK_GRID_LAYOUT (priv->layout_manager)));
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 = gtk_grid_get_instance_private (grid);
if (priv->orientation != orientation)
{
priv->orientation = orientation;
gtk_widget_update_orientation (GTK_WIDGET (grid), priv->orientation);
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 void
grid_attach (GtkGrid *grid,
GtkWidget *widget,
int column,
int row,
int width,
int height)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkGridLayoutChild *grid_child;
gtk_widget_set_parent (widget, GTK_WIDGET (grid));
grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, widget));
gtk_grid_layout_child_set_column (grid_child, column);
gtk_grid_layout_child_set_row (grid_child, row);
gtk_grid_layout_child_set_column_span (grid_child, width);
gtk_grid_layout_child_set_row_span (grid_child, height);
}
/* 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 int
find_attach_position (GtkGrid *grid,
GtkOrientation orientation,
int op_pos,
int op_span,
gboolean max)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkWidget *child;
gboolean hit;
int pos;
if (max)
pos = -G_MAXINT;
else
pos = G_MAXINT;
hit = FALSE;
for (child = gtk_widget_get_first_child (GTK_WIDGET (grid));
child != NULL;
child = gtk_widget_get_next_sibling (child))
{
GtkGridLayoutChild *grid_child;
int attach_pos = 0, attach_span = 0;
int opposite_pos = 0, opposite_span = 0;
grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, child));
switch (orientation)
{
case GTK_ORIENTATION_HORIZONTAL:
attach_pos = gtk_grid_layout_child_get_column (grid_child);
attach_span = gtk_grid_layout_child_get_column_span (grid_child);
opposite_pos = gtk_grid_layout_child_get_row (grid_child);
opposite_span = gtk_grid_layout_child_get_row_span (grid_child);
break;
case GTK_ORIENTATION_VERTICAL:
attach_pos = gtk_grid_layout_child_get_row (grid_child);
attach_span = gtk_grid_layout_child_get_row_span (grid_child);
opposite_pos = gtk_grid_layout_child_get_column (grid_child);
opposite_span = gtk_grid_layout_child_get_column_span (grid_child);
break;
default:
break;
}
/* 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_compute_expand (GtkWidget *widget,
gboolean *hexpand_p,
gboolean *vexpand_p)
{
GtkWidget *w;
gboolean hexpand = FALSE;
gboolean vexpand = FALSE;
for (w = gtk_widget_get_first_child (widget);
w != NULL;
w = gtk_widget_get_next_sibling (w))
{
hexpand = hexpand || gtk_widget_compute_expand (w, GTK_ORIENTATION_HORIZONTAL);
vexpand = vexpand || gtk_widget_compute_expand (w, GTK_ORIENTATION_VERTICAL);
}
*hexpand_p = hexpand;
*vexpand_p = vexpand;
}
static GtkSizeRequestMode
gtk_grid_get_request_mode (GtkWidget *widget)
{
GtkWidget *w;
int wfh = 0, hfw = 0;
for (w = gtk_widget_get_first_child (widget);
w != NULL;
w = gtk_widget_get_next_sibling (w))
{
GtkSizeRequestMode mode = gtk_widget_get_request_mode (w);
switch (mode)
{
case GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH:
hfw ++;
break;
case GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT:
wfh ++;
break;
case GTK_SIZE_REQUEST_CONSTANT_SIZE:
default:
break;
}
}
if (hfw == 0 && wfh == 0)
return GTK_SIZE_REQUEST_CONSTANT_SIZE;
else
return wfh > hfw ?
GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT :
GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH;
}
static void
gtk_grid_dispose (GObject *object)
{
GtkWidget *child;
while ((child = gtk_widget_get_first_child (GTK_WIDGET (object))))
gtk_grid_remove (GTK_GRID (object), child);
G_OBJECT_CLASS (gtk_grid_parent_class)->dispose (object);
}
static void
gtk_grid_class_init (GtkGridClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
object_class->dispose = gtk_grid_dispose;
object_class->get_property = gtk_grid_get_property;
object_class->set_property = gtk_grid_set_property;
widget_class->compute_expand = gtk_grid_compute_expand;
widget_class->get_request_mode = gtk_grid_get_request_mode;
g_object_class_override_property (object_class, PROP_ORIENTATION, "orientation");
/**
* GtkGrid:row-spacing: (attributes org.gtk.Property.get=gtk_grid_get_row_spacing org.gtk.Property.set=gtk_grid_set_row_spacing)
*
* The amount of space between two consecutive rows.
*/
obj_properties[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_PARAM_EXPLICIT_NOTIFY);
/**
* GtkGrid:column-spacing: (attributes org.gtk.Property.get=gtk_grid_get_column_spacing org.gtk.Property.set=gtk_grid_set_column_spacing)
*
* The amount of space between two consecutive columns.
*/
obj_properties[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_PARAM_EXPLICIT_NOTIFY);
/**
* GtkGrid:row-homogeneous: (attributes org.gtk.Property.get=gtk_grid_get_row_homogeneous org.gtk.Property.set=gtk_grid_set_row_homogeneous)
*
* If %TRUE, the rows are all the same height.
*/
obj_properties[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_PARAM_EXPLICIT_NOTIFY);
/**
* GtkGrid:column-homogeneous: (attributes org.gtk.Property.get=gtk_grid_get_column_homogeneous org.gtk.Property.set=gtk_grid_set_column_homogeneous)
*
* If %TRUE, the columns are all the same width.
*/
obj_properties[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_PARAM_EXPLICIT_NOTIFY);
/**
* GtkGrid:baseline-row: (attributes org.gtk.Property.get=gtk_grid_get_baseline_row org.gtk.Property.set=gtk_grid_set_baseline_row)
*
* The row to align to the baseline when valign is %GTK_ALIGN_BASELINE.
*/
obj_properties[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|G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (object_class, N_PROPERTIES, obj_properties);
gtk_widget_class_set_css_name (widget_class, I_("grid"));
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_GRID_LAYOUT);
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_GROUP);
}
static GtkBuildableIface *parent_buildable_iface;
static void
gtk_grid_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *type)
{
if (GTK_IS_WIDGET (child))
{
GtkGrid *grid = GTK_GRID ( buildable);
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
int pos[2] = { 0, 0 };
pos[priv->orientation] = find_attach_position (grid, priv->orientation, 0, 1, TRUE);
grid_attach (grid, GTK_WIDGET (child), pos[0], pos[1], 1, 1);
}
else
parent_buildable_iface->add_child (buildable, builder, child, type);
}
static void
gtk_grid_buildable_iface_init (GtkBuildableIface *iface)
{
parent_buildable_iface = g_type_interface_peek_parent (iface);
iface->add_child = gtk_grid_buildable_add_child;
}
static void
gtk_grid_init (GtkGrid *grid)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
priv->layout_manager = gtk_widget_get_layout_manager (GTK_WIDGET (grid));
priv->orientation = GTK_ORIENTATION_HORIZONTAL;
gtk_widget_update_orientation (GTK_WIDGET (grid), priv->orientation);
}
/**
* 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
* @column: the column number to attach the left side of @child to
* @row: 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 @column and @row.
* The number of “cells” that @child will occupy is determined
* by @width and @height.
*/
void
gtk_grid_attach (GtkGrid *grid,
GtkWidget *child,
int column,
int row,
int width,
int 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, column, row, 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,
int width,
int height)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkGridLayoutChild *grid_sibling;
int 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 != NULL)
{
grid_sibling = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, sibling));
switch (side)
{
case GTK_POS_LEFT:
left = gtk_grid_layout_child_get_column (grid_sibling) - width;
top = gtk_grid_layout_child_get_row (grid_sibling);
break;
case GTK_POS_RIGHT:
left = gtk_grid_layout_child_get_column (grid_sibling) +
gtk_grid_layout_child_get_column_span (grid_sibling);
top = gtk_grid_layout_child_get_row (grid_sibling);
break;
case GTK_POS_TOP:
left = gtk_grid_layout_child_get_column (grid_sibling);
top = gtk_grid_layout_child_get_row (grid_sibling) - height;
break;
case GTK_POS_BOTTOM:
left = gtk_grid_layout_child_get_column (grid_sibling);
top = gtk_grid_layout_child_get_row (grid_sibling) +
gtk_grid_layout_child_get_row_span (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`
* @column: the left edge of the cell
* @row: the top edge of the cell
*
* Gets the child of @grid whose area covers the grid
* cell at @column, @row.
*
* Returns: (transfer none) (nullable): the child at the given position, or %NULL
*/
GtkWidget *
gtk_grid_get_child_at (GtkGrid *grid,
int column,
int row)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkWidget *child;
g_return_val_if_fail (GTK_IS_GRID (grid), NULL);
for (child = gtk_widget_get_first_child (GTK_WIDGET (grid));
child != NULL;
child = gtk_widget_get_next_sibling (child))
{
GtkGridLayoutChild *grid_child;
int child_column, child_row, child_width, child_height;
grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, child));
child_column = gtk_grid_layout_child_get_column (grid_child);
child_row = gtk_grid_layout_child_get_row (grid_child);
child_width = gtk_grid_layout_child_get_column_span (grid_child);
child_height = gtk_grid_layout_child_get_row_span (grid_child);
if (child_column <= column && child_column + child_width > column &&
child_row <= row && child_row + child_height > row)
return child;
}
return NULL;
}
/**
* gtk_grid_remove:
* @grid: a `GtkGrid`
* @child: the child widget to remove
*
* Removes a child from @grid.
*
* The child must have been added with
* [method@Gtk.Grid.attach] or [method@Gtk.Grid.attach_next_to].
*/
void
gtk_grid_remove (GtkGrid *grid,
GtkWidget *child)
{
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) == GTK_WIDGET (grid));
gtk_widget_unparent (child);
}
/**
* 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.
*/
void
gtk_grid_insert_row (GtkGrid *grid,
int position)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkWidget *child;
int top, height;
g_return_if_fail (GTK_IS_GRID (grid));
for (child = gtk_widget_get_first_child (GTK_WIDGET (grid));
child != NULL;
child = gtk_widget_get_next_sibling (child))
{
GtkGridLayoutChild *grid_child;
grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, child));
top = gtk_grid_layout_child_get_row (grid_child);
height = gtk_grid_layout_child_get_row_span (grid_child);
if (top >= position)
gtk_grid_layout_child_set_row (grid_child, top + 1);
else if (top + height > position)
gtk_grid_layout_child_set_row_span (grid_child, height + 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.
*/
void
gtk_grid_remove_row (GtkGrid *grid,
int position)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkWidget *child;
g_return_if_fail (GTK_IS_GRID (grid));
child = gtk_widget_get_first_child (GTK_WIDGET (grid));
while (child)
{
GtkWidget *next = gtk_widget_get_next_sibling (child);
GtkGridLayoutChild *grid_child;
int top, height;
grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, child));
top = gtk_grid_layout_child_get_row (grid_child);
height = gtk_grid_layout_child_get_row_span (grid_child);
if (top <= position && top + height > position)
height--;
if (top > position)
top--;
if (height <= 0)
{
gtk_grid_remove (grid, child);
}
else
{
gtk_grid_layout_child_set_row_span (grid_child, height);
gtk_grid_layout_child_set_row (grid_child, top);
}
child = next;
}
}
/**
* 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.
*/
void
gtk_grid_insert_column (GtkGrid *grid,
int position)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkWidget *child;
g_return_if_fail (GTK_IS_GRID (grid));
for (child = gtk_widget_get_first_child (GTK_WIDGET (grid));
child != NULL;
child = gtk_widget_get_next_sibling (child))
{
GtkGridLayoutChild *grid_child;
int left, width;
grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, child));
left = gtk_grid_layout_child_get_column (grid_child);
width = gtk_grid_layout_child_get_column_span (grid_child);
if (left >= position)
gtk_grid_layout_child_set_column (grid_child, left + 1);
else if (left + width > position)
gtk_grid_layout_child_set_column_span (grid_child, width + 1);
}
}
/**
* 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.
*/
void
gtk_grid_remove_column (GtkGrid *grid,
int position)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkWidget *child;
g_return_if_fail (GTK_IS_GRID (grid));
child = gtk_widget_get_first_child (GTK_WIDGET (grid));
while (child)
{
GtkWidget *next = gtk_widget_get_next_sibling (child);
GtkGridLayoutChild *grid_child;
int left, width;
grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, child));
left = gtk_grid_layout_child_get_column (grid_child);
width = gtk_grid_layout_child_get_column_span (grid_child);
if (left <= position && left + width > position)
width--;
if (left > position)
left--;
if (width <= 0)
{
gtk_grid_remove (grid, child);
}
else
{
gtk_grid_layout_child_set_column_span (grid_child, width);
gtk_grid_layout_child_set_column (grid_child, left);
}
child = next;
}
}
/**
* 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.
*/
void
gtk_grid_insert_next_to (GtkGrid *grid,
GtkWidget *sibling,
GtkPositionType side)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkGridLayoutChild *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 = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, sibling));
switch (side)
{
case GTK_POS_LEFT:
gtk_grid_insert_column (grid, gtk_grid_layout_child_get_column (child));
break;
case GTK_POS_RIGHT:
{
int col = gtk_grid_layout_child_get_column (child) +
gtk_grid_layout_child_get_column_span (child);
gtk_grid_insert_column (grid, col);
}
break;
case GTK_POS_TOP:
gtk_grid_insert_row (grid, gtk_grid_layout_child_get_row (child));
break;
case GTK_POS_BOTTOM:
{
int row = gtk_grid_layout_child_get_row (child) +
gtk_grid_layout_child_get_row_span (child);
gtk_grid_insert_row (grid, row);
}
break;
default:
g_assert_not_reached ();
}
}
/**
* gtk_grid_set_row_homogeneous: (attributes org.gtk.Method.set_property=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 = gtk_grid_get_instance_private (grid);
gboolean old_val;
g_return_if_fail (GTK_IS_GRID (grid));
old_val = gtk_grid_layout_get_row_homogeneous (GTK_GRID_LAYOUT (priv->layout_manager));
if (old_val != !!homogeneous)
{
gtk_grid_layout_set_row_homogeneous (GTK_GRID_LAYOUT (priv->layout_manager), homogeneous);
g_object_notify_by_pspec (G_OBJECT (grid), obj_properties [PROP_ROW_HOMOGENEOUS]);
}
}
/**
* gtk_grid_get_row_homogeneous: (attributes org.gtk.Method.get_property=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 = gtk_grid_get_instance_private (grid);
g_return_val_if_fail (GTK_IS_GRID (grid), FALSE);
return gtk_grid_layout_get_row_homogeneous (GTK_GRID_LAYOUT (priv->layout_manager));
}
/**
* gtk_grid_set_column_homogeneous: (attributes org.gtk.Method.set_property=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 = gtk_grid_get_instance_private (grid);
gboolean old_val;
g_return_if_fail (GTK_IS_GRID (grid));
old_val = gtk_grid_layout_get_column_homogeneous (GTK_GRID_LAYOUT (priv->layout_manager));
if (old_val != !!homogeneous)
{
gtk_grid_layout_set_column_homogeneous (GTK_GRID_LAYOUT (priv->layout_manager), homogeneous);
g_object_notify_by_pspec (G_OBJECT (grid), obj_properties [PROP_COLUMN_HOMOGENEOUS]);
}
}
/**
* gtk_grid_get_column_homogeneous: (attributes org.gtk.Method.get_property=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 = gtk_grid_get_instance_private (grid);
g_return_val_if_fail (GTK_IS_GRID (grid), FALSE);
return gtk_grid_layout_get_column_homogeneous (GTK_GRID_LAYOUT (priv->layout_manager));
}
/**
* gtk_grid_set_row_spacing: (attributes org.gtk.Method.set_property=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 = gtk_grid_get_instance_private (grid);
guint old_spacing;
g_return_if_fail (GTK_IS_GRID (grid));
g_return_if_fail (spacing <= G_MAXINT16);
old_spacing = gtk_grid_layout_get_row_spacing (GTK_GRID_LAYOUT (priv->layout_manager));
if (old_spacing != spacing)
{
gtk_grid_layout_set_row_spacing (GTK_GRID_LAYOUT (priv->layout_manager), spacing);
g_object_notify_by_pspec (G_OBJECT (grid), obj_properties [PROP_ROW_SPACING]);
}
}
/**
* gtk_grid_get_row_spacing: (attributes org.gtk.Method.get_property=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 = gtk_grid_get_instance_private (grid);
g_return_val_if_fail (GTK_IS_GRID (grid), 0);
return gtk_grid_layout_get_row_spacing (GTK_GRID_LAYOUT (priv->layout_manager));
}
/**
* gtk_grid_set_column_spacing: (attributes org.gtk.Method.set_property=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 = gtk_grid_get_instance_private (grid);
guint old_spacing;
g_return_if_fail (GTK_IS_GRID (grid));
g_return_if_fail (spacing <= G_MAXINT16);
old_spacing = gtk_grid_layout_get_column_spacing (GTK_GRID_LAYOUT (priv->layout_manager));
if (old_spacing != spacing)
{
gtk_grid_layout_set_column_spacing (GTK_GRID_LAYOUT (priv->layout_manager), spacing);
g_object_notify_by_pspec (G_OBJECT (grid), obj_properties [PROP_COLUMN_SPACING]);
}
}
/**
* gtk_grid_get_column_spacing: (attributes org.gtk.Method.get_property=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 = gtk_grid_get_instance_private (grid);
g_return_val_if_fail (GTK_IS_GRID (grid), 0);
return gtk_grid_layout_get_column_spacing (GTK_GRID_LAYOUT (priv->layout_manager));
}
/**
* 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.
*
* The default baseline position is %GTK_BASELINE_POSITION_CENTER.
*/
void
gtk_grid_set_row_baseline_position (GtkGrid *grid,
int row,
GtkBaselinePosition pos)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
g_return_if_fail (GTK_IS_GRID (grid));
gtk_grid_layout_set_row_baseline_position (GTK_GRID_LAYOUT (priv->layout_manager),
row,
pos);
}
/**
* gtk_grid_get_row_baseline_position:
* @grid: a `GtkGrid`
* @row: a row index
*
* Returns the baseline position of @row.
*
* See [method@Gtk.Grid.set_row_baseline_position].
*
* Returns: the baseline position of @row
*/
GtkBaselinePosition
gtk_grid_get_row_baseline_position (GtkGrid *grid,
int row)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
g_return_val_if_fail (GTK_IS_GRID (grid), GTK_BASELINE_POSITION_CENTER);
return gtk_grid_layout_get_row_baseline_position (GTK_GRID_LAYOUT (priv->layout_manager), row);
}
/**
* gtk_grid_set_baseline_row: (attributes org.gtk.Method.set_property=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.
*/
void
gtk_grid_set_baseline_row (GtkGrid *grid,
int row)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
int old_row;
g_return_if_fail (GTK_IS_GRID (grid));
old_row = gtk_grid_layout_get_baseline_row (GTK_GRID_LAYOUT (priv->layout_manager));
if (old_row != row)
{
gtk_grid_layout_set_baseline_row (GTK_GRID_LAYOUT (priv->layout_manager), row);
g_object_notify (G_OBJECT (grid), "baseline-row");
}
}
/**
* gtk_grid_get_baseline_row: (attributes org.gtk.Method.get_property=baseline-row)
* @grid: a `GtkGrid`
*
* Returns which row defines the global baseline of @grid.
*
* Returns: the row index defining the global baseline
*/
int
gtk_grid_get_baseline_row (GtkGrid *grid)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
g_return_val_if_fail (GTK_IS_GRID (grid), 0);
return gtk_grid_layout_get_baseline_row (GTK_GRID_LAYOUT (priv->layout_manager));
}
/**
* gtk_grid_query_child:
* @grid: a `GtkGrid`
* @child: a `GtkWidget` child of @grid
* @column: (out) (optional): the column used to attach the left side of @child
* @row: (out) (optional): the row used to attach the top side of @child
* @width: (out) (optional): the number of columns @child spans
* @height: (out) (optional): the number of rows @child spans
*
* Queries the attach points and spans of @child inside the given `GtkGrid`.
*/
void
gtk_grid_query_child (GtkGrid *grid,
GtkWidget *child,
int *column,
int *row,
int *width,
int *height)
{
GtkGridPrivate *priv = gtk_grid_get_instance_private (grid);
GtkGridLayoutChild *grid_child;
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) == (GtkWidget *) grid);
grid_child = GTK_GRID_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout_manager, child));
if (column != NULL)
*column = gtk_grid_layout_child_get_column (grid_child);
if (row != NULL)
*row = gtk_grid_layout_child_get_row (grid_child);
if (width != NULL)
*width = gtk_grid_layout_child_get_column_span (grid_child);
if (height != NULL)
*height = gtk_grid_layout_child_get_row_span (grid_child);
}
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