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gtk2/gtk/gtkgridview.c
Matthias Clasen 6d562b6176 listview: Set accessible roles 
Use the LIST and LIST_ITEM roles for GtkListView
and its children. Use the GRID and GRID_CELL roles
for GtkGridView and its children.
2020-10-14 23:34:51 -04:00

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/*
* Copyright © 2019 Benjamin Otte
*
* 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 2.1 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/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
#include "gtkgridview.h"
#include "gtkbitset.h"
#include "gtkintl.h"
#include "gtklistbaseprivate.h"
#include "gtklistitemfactory.h"
#include "gtklistitemmanagerprivate.h"
#include "gtkmain.h"
#include "gtkprivate.h"
#include "gtksingleselection.h"
#include "gtkwidgetprivate.h"
#include "gtkmultiselection.h"
/* Maximum number of list items created by the gridview.
* For debugging, you can set this to G_MAXUINT to ensure
* there's always a list item for every row.
*
* We multiply this number with GtkGridView:max-columns so
* that we can always display at least this many rows.
*/
#define GTK_GRID_VIEW_MAX_VISIBLE_ROWS (30)
#define DEFAULT_MAX_COLUMNS (7)
/**
* SECTION:gtkgridview
* @title: GtkGridView
* @short_description: A widget for displaying grids
* @see_also: #GtkSelectionModel, #GtkListView, #GtkColumnView
*
* GtkGridView is a widget to present a view into a large dynamic grid of items.
*
* GtkGridView uses its factory to generate one child widget for each visible item
* and shows them in a grid. The orientation of the grid view determines if the
* grid reflows vertically or horizontally.
*
* GtkGridView allows the user to select items according to the selection
* characteristics of the model. For models that allow multiple selected items,
* it is possible to turn on _rubberband selection_, using
* #GtkGridView:enable-rubberband.
*
* To learn more about the list widget framework, see the [overview](#ListWidget).
*
* # CSS nodes
*
* |[<!-- language="plain" -->
* gridview
* ├── child
* │
* ├── child
* │
* ┊
* ╰── [rubberband]
* ]|
*
* GtkGridView uses a single CSS node with name gridview. Each child
* uses a single CSS node with name child. For rubberband selection,
* a subnode with name rubberband is used.
*/
typedef struct _Cell Cell;
typedef struct _CellAugment CellAugment;
struct _GtkGridView
{
GtkListBase parent_instance;
GtkListItemManager *item_manager;
guint min_columns;
guint max_columns;
/* set in size_allocate */
guint n_columns;
int unknown_row_height;
double column_width;
};
struct _GtkGridViewClass
{
GtkListBaseClass parent_class;
};
struct _Cell
{
GtkListItemManagerItem parent;
guint size; /* total, only counting cells in first column */
};
struct _CellAugment
{
GtkListItemManagerItemAugment parent;
guint size; /* total, only counting first column */
};
enum
{
PROP_0,
PROP_FACTORY,
PROP_MAX_COLUMNS,
PROP_MIN_COLUMNS,
PROP_MODEL,
PROP_SINGLE_CLICK_ACTIVATE,
PROP_ENABLE_RUBBERBAND,
N_PROPS
};
enum {
ACTIVATE,
LAST_SIGNAL
};
G_DEFINE_TYPE (GtkGridView, gtk_grid_view, GTK_TYPE_LIST_BASE)
static GParamSpec *properties[N_PROPS] = { NULL, };
static guint signals[LAST_SIGNAL] = { 0 };
static void G_GNUC_UNUSED
dump (GtkGridView *self)
{
Cell *cell;
guint n_widgets, n_list_rows, n_items;
n_widgets = 0;
n_list_rows = 0;
n_items = 0;
//g_print ("ANCHOR: %u - %u\n", self->anchor_start, self->anchor_end);
for (cell = gtk_list_item_manager_get_first (self->item_manager);
cell;
cell = gtk_rb_tree_node_get_next (cell))
{
if (cell->parent.widget)
n_widgets++;
n_list_rows++;
n_items += cell->parent.n_items;
g_print ("%6u%6u %5ux%3u %s (%upx)\n",
cell->parent.n_items, n_items,
n_items / (self->n_columns ? self->n_columns : self->min_columns),
n_items % (self->n_columns ? self->n_columns : self->min_columns),
cell->parent.widget ? " (widget)" : "", cell->size);
}
g_print (" => %u widgets in %u list rows\n", n_widgets, n_list_rows);
}
static void
cell_augment (GtkRbTree *tree,
gpointer node_augment,
gpointer node,
gpointer left,
gpointer right)
{
Cell *cell = node;
CellAugment *aug = node_augment;
gtk_list_item_manager_augment_node (tree, node_augment, node, left, right);
aug->size = cell->size;
if (left)
{
CellAugment *left_aug = gtk_rb_tree_get_augment (tree, left);
aug->size += left_aug->size;
}
if (right)
{
CellAugment *right_aug = gtk_rb_tree_get_augment (tree, right);
aug->size += right_aug->size;
}
}
/*<private>
* gtk_grid_view_get_cell_at_y:
* @self: a #GtkGridView
* @y: an offset in direction of @self's orientation
* @position: (out caller-allocates) (optional): stores the position
* index of the returned row
* @offset: (out caller-allocates) (optional): stores the offset
* in pixels between y and top of cell.
* @offset: (out caller-allocates) (optional): stores the height
* of the cell
*
* Gets the Cell that occupies the leftmost position in the row at offset
* @y into the primary direction.
*
* If y is larger than the height of all cells, %NULL will be returned.
* In particular that means that for an empty grid, %NULL is returned
* for any value.
*
* Returns: (nullable): The first cell at offset y or %NULL if none
**/
static Cell *
gtk_grid_view_get_cell_at_y (GtkGridView *self,
int y,
guint *position,
int *offset,
int *size)
{
Cell *cell, *tmp;
guint pos;
cell = gtk_list_item_manager_get_root (self->item_manager);
pos = 0;
while (cell)
{
tmp = gtk_rb_tree_node_get_left (cell);
if (tmp)
{
CellAugment *aug = gtk_list_item_manager_get_item_augment (self->item_manager, tmp);
if (y < aug->size)
{
cell = tmp;
continue;
}
y -= aug->size;
pos += aug->parent.n_items;
}
if (y < cell->size)
break;
y -= cell->size;
pos += cell->parent.n_items;
cell = gtk_rb_tree_node_get_right (cell);
}
if (cell == NULL)
{
if (position)
*position = 0;
if (offset)
*offset = 0;
if (size)
*size = 0;
return NULL;
}
/* We know have the (range of) cell(s) that contains this offset.
* Now for the hard part of computing which index this actually is.
*/
if (offset || position || size)
{
guint n_items = cell->parent.n_items;
guint no_widget_rows, skip;
/* skip remaining items at end of row */
if (pos % self->n_columns)
{
skip = self->n_columns - pos % self->n_columns;
if (n_items <= skip)
{
g_warning ("ran out of items");
if (position)
*position = 0;
if (offset)
*offset = 0;
if (size)
*size = 0;
return NULL;
}
n_items -= skip;
pos += skip;
}
/* Skip all the rows this index doesn't go into */
no_widget_rows = (n_items - 1) / self->n_columns;
skip = MIN (y / self->unknown_row_height, no_widget_rows);
y -= skip * self->unknown_row_height;
pos += self->n_columns * skip;
if (position)
*position = pos;
if (offset)
*offset = y;
if (size)
{
if (skip < no_widget_rows)
*size = self->unknown_row_height;
else
*size = cell->size - no_widget_rows * self->unknown_row_height;
}
}
return cell;
}
static gboolean
gtk_grid_view_get_allocation_along (GtkListBase *base,
guint pos,
int *offset,
int *size)
{
GtkGridView *self = GTK_GRID_VIEW (base);
Cell *cell, *tmp;
int y;
cell = gtk_list_item_manager_get_root (self->item_manager);
y = 0;
pos -= pos % self->n_columns;
while (cell)
{
tmp = gtk_rb_tree_node_get_left (cell);
if (tmp)
{
CellAugment *aug = gtk_list_item_manager_get_item_augment (self->item_manager, tmp);
if (pos < aug->parent.n_items)
{
cell = tmp;
continue;
}
pos -= aug->parent.n_items;
y += aug->size;
}
if (pos < cell->parent.n_items)
break;
y += cell->size;
pos -= cell->parent.n_items;
cell = gtk_rb_tree_node_get_right (cell);
}
if (cell == NULL)
{
if (offset)
*offset = 0;
if (size)
*size = 0;
return FALSE;
}
/* We know have the (range of) cell(s) that contains this offset.
* Now for the hard part of computing which index this actually is.
*/
if (offset || size)
{
guint n_items = cell->parent.n_items;
guint skip;
/* skip remaining items at end of row */
if (pos % self->n_columns)
{
skip = pos % self->n_columns;
n_items -= skip;
pos -= skip;
}
/* Skip all the rows this index doesn't go into */
skip = pos / self->n_columns;
n_items -= skip * self->n_columns;
y += skip * self->unknown_row_height;
if (offset)
*offset = y;
if (size)
{
if (n_items > self->n_columns)
*size = self->unknown_row_height;
else
*size = cell->size - skip * self->unknown_row_height;
}
}
return TRUE;
}
static gboolean
gtk_grid_view_get_allocation_across (GtkListBase *base,
guint pos,
int *offset,
int *size)
{
GtkGridView *self = GTK_GRID_VIEW (base);
guint start;
pos %= self->n_columns;
start = ceil (self->column_width * pos);
if (offset)
*offset = start;
if (size)
*size = ceil (self->column_width * (pos + 1)) - start;
return TRUE;
}
static gboolean
gtk_grid_view_get_position_from_allocation (GtkListBase *base,
int across,
int along,
guint *position,
cairo_rectangle_int_t *area)
{
GtkGridView *self = GTK_GRID_VIEW (base);
int offset, size;
guint pos, n_items;
if (across >= self->column_width * self->n_columns)
return FALSE;
n_items = gtk_list_base_get_n_items (base);
if (!gtk_grid_view_get_cell_at_y (self,
along,
&pos,
&offset,
&size))
return FALSE;
pos += floor (across / self->column_width);
if (pos >= n_items)
{
/* Ugh, we're in the last row and don't have enough items
* to fill the row.
* Do it the hard way then... */
pos = n_items - 1;
}
*position = pos;
if (area)
{
area->x = ceil (self->column_width * (pos % self->n_columns));
area->width = ceil (self->column_width * (1 + pos % self->n_columns)) - area->x;
area->y = along - offset;
area->height = size;
}
return TRUE;
}
static GtkBitset *
gtk_grid_view_get_items_in_rect (GtkListBase *base,
const GdkRectangle *rect)
{
GtkGridView *self = GTK_GRID_VIEW (base);
guint first_row, last_row, first_column, last_column, n_items;
GtkBitset *result;
result = gtk_bitset_new_empty ();
n_items = gtk_list_base_get_n_items (base);
if (n_items == 0)
return result;
first_column = floor (rect->x / self->column_width);
last_column = floor ((rect->x + rect->width) / self->column_width);
if (!gtk_grid_view_get_cell_at_y (self, rect->y, &first_row, NULL, NULL))
first_row = rect->y < 0 ? 0 : n_items - 1;
if (!gtk_grid_view_get_cell_at_y (self, rect->y + rect->height, &last_row, NULL, NULL))
last_row = rect->y < 0 ? 0 : n_items - 1;
gtk_bitset_add_rectangle (result,
first_row + first_column,
last_column - first_column + 1,
(last_row - first_row) / self->n_columns + 1,
self->n_columns);
return result;
}
static guint
gtk_grid_view_move_focus_along (GtkListBase *base,
guint pos,
int steps)
{
GtkGridView *self = GTK_GRID_VIEW (base);
steps *= self->n_columns;
if (steps < 0)
{
if (pos >= self->n_columns)
pos -= MIN (pos, -steps);
}
else
{
guint n_items = gtk_list_base_get_n_items (base);
if (n_items / self->n_columns > pos / self->n_columns)
pos += MIN (n_items - pos - 1, steps);
}
return pos;
}
static guint
gtk_grid_view_move_focus_across (GtkListBase *base,
guint pos,
int steps)
{
if (steps < 0)
return pos - MIN (pos, -steps);
else
{
guint n_items = gtk_list_base_get_n_items (base);
pos += MIN (n_items - pos - 1, steps);
}
return pos;
}
static int
compare_ints (gconstpointer first,
gconstpointer second)
{
return *(int *) first - *(int *) second;
}
static int
gtk_grid_view_get_unknown_row_size (GtkGridView *self,
GArray *heights)
{
g_return_val_if_fail (heights->len > 0, 0);
/* return the median and hope rows are generally uniform with few outliers */
g_array_sort (heights, compare_ints);
return g_array_index (heights, int, heights->len / 2);
}
static void
gtk_grid_view_measure_column_size (GtkGridView *self,
int *minimum,
int *natural)
{
GtkOrientation opposite;
Cell *cell;
int min, nat, child_min, child_nat;
min = 0;
nat = 0;
opposite = gtk_list_base_get_opposite_orientation (GTK_LIST_BASE (self));
for (cell = gtk_list_item_manager_get_first (self->item_manager);
cell != NULL;
cell = gtk_rb_tree_node_get_next (cell))
{
/* ignore unavailable cells */
if (cell->parent.widget == NULL)
continue;
gtk_widget_measure (cell->parent.widget,
opposite, -1,
&child_min, &child_nat, NULL, NULL);
min = MAX (min, child_min);
nat = MAX (nat, child_nat);
}
*minimum = min;
*natural = nat;
}
static void
gtk_grid_view_measure_across (GtkWidget *widget,
int for_size,
int *minimum,
int *natural)
{
GtkGridView *self = GTK_GRID_VIEW (widget);
gtk_grid_view_measure_column_size (self, minimum, natural);
*minimum *= self->min_columns;
*natural *= self->max_columns;
}
static guint
gtk_grid_view_compute_n_columns (GtkGridView *self,
guint for_size,
int min,
int nat)
{
guint n_columns;
/* rounding down is exactly what we want here, so int division works */
if (gtk_list_base_get_scroll_policy (GTK_LIST_BASE (self),
gtk_list_base_get_opposite_orientation (GTK_LIST_BASE (self))) == GTK_SCROLL_MINIMUM)
n_columns = for_size / MAX (1, min);
else
n_columns = for_size / MAX (1, nat);
n_columns = CLAMP (n_columns, self->min_columns, self->max_columns);
return n_columns;
}
static void
gtk_grid_view_measure_list (GtkWidget *widget,
int for_size,
int *minimum,
int *natural)
{
GtkGridView *self = GTK_GRID_VIEW (widget);
GtkScrollablePolicy scroll_policy;
Cell *cell;
int height, row_height, child_min, child_nat, column_size, col_min, col_nat;
gboolean measured;
GArray *heights;
guint n_unknown, n_columns;
guint i;
scroll_policy = gtk_list_base_get_scroll_policy (GTK_LIST_BASE (self), gtk_list_base_get_orientation (GTK_LIST_BASE (self)));
heights = g_array_new (FALSE, FALSE, sizeof (int));
n_unknown = 0;
height = 0;
gtk_grid_view_measure_column_size (self, &col_min, &col_nat);
for_size = MAX (for_size, col_min * (int) self->min_columns);
n_columns = gtk_grid_view_compute_n_columns (self, for_size, col_min, col_nat);
column_size = for_size / n_columns;
i = 0;
row_height = 0;
measured = FALSE;
for (cell = gtk_list_item_manager_get_first (self->item_manager);
cell != NULL;
cell = gtk_rb_tree_node_get_next (cell))
{
if (cell->parent.widget)
{
gtk_widget_measure (cell->parent.widget,
gtk_list_base_get_orientation (GTK_LIST_BASE (self)),
column_size,
&child_min, &child_nat, NULL, NULL);
if (scroll_policy == GTK_SCROLL_MINIMUM)
row_height = MAX (row_height, child_min);
else
row_height = MAX (row_height, child_nat);
measured = TRUE;
}
i += cell->parent.n_items;
if (i >= n_columns)
{
if (measured)
{
g_array_append_val (heights, row_height);
i -= n_columns;
height += row_height;
measured = FALSE;
row_height = 0;
}
n_unknown += i / n_columns;
i %= n_columns;
}
}
if (i > 0)
{
if (measured)
{
g_array_append_val (heights, row_height);
height += row_height;
}
else
n_unknown++;
}
if (n_unknown)
height += n_unknown * gtk_grid_view_get_unknown_row_size (self, heights);
g_array_free (heights, TRUE);
*minimum = height;
*natural = height;
}
static void
gtk_grid_view_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkGridView *self = GTK_GRID_VIEW (widget);
if (orientation == gtk_list_base_get_orientation (GTK_LIST_BASE (self)))
gtk_grid_view_measure_list (widget, for_size, minimum, natural);
else
gtk_grid_view_measure_across (widget, for_size, minimum, natural);
}
static void
cell_set_size (Cell *cell,
guint size)
{
if (cell->size == size)
return;
cell->size = size;
gtk_rb_tree_node_mark_dirty (cell);
}
static int
gtk_grid_view_compute_total_height (GtkGridView *self)
{
Cell *cell;
CellAugment *aug;
cell = gtk_list_item_manager_get_root (self->item_manager);
if (cell == NULL)
return 0;
aug = gtk_list_item_manager_get_item_augment (self->item_manager, cell);
return aug->size;
}
static void
gtk_grid_view_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkGridView *self = GTK_GRID_VIEW (widget);
Cell *cell, *start;
GArray *heights;
int min_row_height, row_height, col_min, col_nat;
GtkOrientation orientation, opposite_orientation;
GtkScrollablePolicy scroll_policy;
gboolean known;
int x, y;
guint i;
orientation = gtk_list_base_get_orientation (GTK_LIST_BASE (self));
scroll_policy = gtk_list_base_get_scroll_policy (GTK_LIST_BASE (self), orientation);
opposite_orientation = OPPOSITE_ORIENTATION (orientation);
min_row_height = ceil ((double) height / GTK_GRID_VIEW_MAX_VISIBLE_ROWS);
/* step 0: exit early if list is empty */
if (gtk_list_item_manager_get_root (self->item_manager) == NULL)
return;
/* step 1: determine width of the list */
gtk_grid_view_measure_column_size (self, &col_min, &col_nat);
self->n_columns = gtk_grid_view_compute_n_columns (self,
orientation == GTK_ORIENTATION_VERTICAL ? width : height,
col_min, col_nat);
self->column_width = (orientation == GTK_ORIENTATION_VERTICAL ? width : height) / self->n_columns;
self->column_width = MAX (self->column_width, col_min);
/* step 2: determine height of known rows */
heights = g_array_new (FALSE, FALSE, sizeof (int));
i = 0;
row_height = 0;
start = NULL;
for (cell = gtk_list_item_manager_get_first (self->item_manager);
cell != NULL;
cell = gtk_rb_tree_node_get_next (cell))
{
if (i == 0)
start = cell;
if (cell->parent.widget)
{
int min, nat, size;
gtk_widget_measure (cell->parent.widget,
gtk_list_base_get_orientation (GTK_LIST_BASE (self)),
self->column_width,
&min, &nat, NULL, NULL);
if (scroll_policy == GTK_SCROLL_MINIMUM)
size = min;
else
size = nat;
size = MAX (size, min_row_height);
g_array_append_val (heights, size);
row_height = MAX (row_height, size);
}
cell_set_size (cell, 0);
i += cell->parent.n_items;
if (i >= self->n_columns)
{
i %= self->n_columns;
cell_set_size (start, start->size + row_height);
start = cell;
row_height = 0;
}
}
if (i > 0)
cell_set_size (start, start->size + row_height);
/* step 3: determine height of rows with only unknown items */
self->unknown_row_height = gtk_grid_view_get_unknown_row_size (self, heights);
g_array_free (heights, TRUE);
i = 0;
known = FALSE;
for (start = cell = gtk_list_item_manager_get_first (self->item_manager);
cell != NULL;
cell = gtk_rb_tree_node_get_next (cell))
{
if (i == 0)
start = cell;
if (cell->parent.widget)
known = TRUE;
i += cell->parent.n_items;
if (i >= self->n_columns)
{
if (!known)
cell_set_size (start, start->size + self->unknown_row_height);
i -= self->n_columns;
known = FALSE;
if (i >= self->n_columns)
{
cell_set_size (cell, cell->size + self->unknown_row_height * (i / self->n_columns));
i %= self->n_columns;
}
start = cell;
}
}
if (i > 0 && !known)
cell_set_size (start, start->size + self->unknown_row_height);
/* step 4: update the adjustments */
gtk_list_base_update_adjustments (GTK_LIST_BASE (self),
self->column_width * self->n_columns,
gtk_grid_view_compute_total_height (self),
gtk_widget_get_size (widget, opposite_orientation),
gtk_widget_get_size (widget, orientation),
&x, &y);
/* step 5: run the size_allocate loop */
x = -x;
y = -y;
i = 0;
row_height = 0;
for (cell = gtk_list_item_manager_get_first (self->item_manager);
cell != NULL;
cell = gtk_rb_tree_node_get_next (cell))
{
if (cell->parent.widget)
{
row_height += cell->size;
gtk_list_base_size_allocate_child (GTK_LIST_BASE (self),
cell->parent.widget,
x + ceil (self->column_width * i),
y,
ceil (self->column_width * (i + 1)) - ceil (self->column_width * i),
row_height);
i++;
if (i >= self->n_columns)
{
y += row_height;
i -= self->n_columns;
row_height = 0;
}
}
else
{
i += cell->parent.n_items;
/* skip remaining row if we didn't start one */
if (i > cell->parent.n_items && i >= self->n_columns)
{
i -= self->n_columns;
y += row_height;
row_height = 0;
}
row_height += cell->size;
/* skip rows that are completely contained by this cell */
if (i >= self->n_columns)
{
guint unknown_rows, unknown_height;
unknown_rows = i / self->n_columns;
unknown_height = unknown_rows * self->unknown_row_height;
row_height -= unknown_height;
y += unknown_height;
i %= self->n_columns;
g_assert (row_height >= 0);
}
}
}
gtk_list_base_allocate_rubberband (GTK_LIST_BASE (widget));
}
static void
gtk_grid_view_dispose (GObject *object)
{
GtkGridView *self = GTK_GRID_VIEW (object);
self->item_manager = NULL;
G_OBJECT_CLASS (gtk_grid_view_parent_class)->dispose (object);
}
static void
gtk_grid_view_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GtkGridView *self = GTK_GRID_VIEW (object);
switch (property_id)
{
case PROP_FACTORY:
g_value_set_object (value, gtk_list_item_manager_get_factory (self->item_manager));
break;
case PROP_MAX_COLUMNS:
g_value_set_uint (value, self->max_columns);
break;
case PROP_MIN_COLUMNS:
g_value_set_uint (value, self->min_columns);
break;
case PROP_MODEL:
g_value_set_object (value, gtk_list_base_get_model (GTK_LIST_BASE (self)));
break;
case PROP_SINGLE_CLICK_ACTIVATE:
g_value_set_boolean (value, gtk_list_item_manager_get_single_click_activate (self->item_manager));
break;
case PROP_ENABLE_RUBBERBAND:
g_value_set_boolean (value, gtk_list_base_get_enable_rubberband (GTK_LIST_BASE (self)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_grid_view_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GtkGridView *self = GTK_GRID_VIEW (object);
switch (property_id)
{
case PROP_FACTORY:
gtk_grid_view_set_factory (self, g_value_get_object (value));
break;
case PROP_MAX_COLUMNS:
gtk_grid_view_set_max_columns (self, g_value_get_uint (value));
break;
case PROP_MIN_COLUMNS:
gtk_grid_view_set_min_columns (self, g_value_get_uint (value));
break;
case PROP_MODEL:
gtk_grid_view_set_model (self, g_value_get_object (value));
break;
case PROP_SINGLE_CLICK_ACTIVATE:
gtk_grid_view_set_single_click_activate (self, g_value_get_boolean (value));
break;
case PROP_ENABLE_RUBBERBAND:
gtk_grid_view_set_enable_rubberband (self, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_grid_view_activate_item (GtkWidget *widget,
const char *action_name,
GVariant *parameter)
{
GtkGridView *self = GTK_GRID_VIEW (widget);
guint pos;
if (!g_variant_check_format_string (parameter, "u", FALSE))
return;
g_variant_get (parameter, "u", &pos);
if (pos >= gtk_list_base_get_n_items (GTK_LIST_BASE (self)))
return;
g_signal_emit (widget, signals[ACTIVATE], 0, pos);
}
static void
gtk_grid_view_class_init (GtkGridViewClass *klass)
{
GtkListBaseClass *list_base_class = GTK_LIST_BASE_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
list_base_class->list_item_name = "child";
list_base_class->list_item_role = GTK_ACCESSIBLE_ROLE_GRID_CELL;
list_base_class->list_item_size = sizeof (Cell);
list_base_class->list_item_augment_size = sizeof (CellAugment);
list_base_class->list_item_augment_func = cell_augment;
list_base_class->get_allocation_along = gtk_grid_view_get_allocation_along;
list_base_class->get_allocation_across = gtk_grid_view_get_allocation_across;
list_base_class->get_items_in_rect = gtk_grid_view_get_items_in_rect;
list_base_class->get_position_from_allocation = gtk_grid_view_get_position_from_allocation;
list_base_class->move_focus_along = gtk_grid_view_move_focus_along;
list_base_class->move_focus_across = gtk_grid_view_move_focus_across;
widget_class->measure = gtk_grid_view_measure;
widget_class->size_allocate = gtk_grid_view_size_allocate;
gobject_class->dispose = gtk_grid_view_dispose;
gobject_class->get_property = gtk_grid_view_get_property;
gobject_class->set_property = gtk_grid_view_set_property;
/**
* GtkGridView:factory:
*
* Factory for populating list items
*/
properties[PROP_FACTORY] =
g_param_spec_object ("factory",
P_("Factory"),
P_("Factory for populating list items"),
GTK_TYPE_LIST_ITEM_FACTORY,
G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
/**
* GtkGridView:max-columns:
*
* Maximum number of columns per row
*
* If this number is smaller than GtkGridView:min-columns, that value
* is used instead.
*/
properties[PROP_MAX_COLUMNS] =
g_param_spec_uint ("max-columns",
P_("Max columns"),
P_("Maximum number of columns per row"),
1, G_MAXUINT, DEFAULT_MAX_COLUMNS,
G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
/**
* GtkGridView:min-columns:
*
* Minimum number of columns per row
*/
properties[PROP_MIN_COLUMNS] =
g_param_spec_uint ("min-columns",
P_("Min columns"),
P_("Minimum number of columns per row"),
1, G_MAXUINT, 1,
G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
/**
* GtkGridView:model:
*
* Model for the items displayed
*/
properties[PROP_MODEL] =
g_param_spec_object ("model",
P_("Model"),
P_("Model for the items displayed"),
GTK_TYPE_SELECTION_MODEL,
G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
/**
* GtkGridView:single-click-activate:
*
* Activate rows on single click and select them on hover
*/
properties[PROP_SINGLE_CLICK_ACTIVATE] =
g_param_spec_boolean ("single-click-activate",
P_("Single click activate"),
P_("Activate rows on single click"),
FALSE,
G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkGridView:enable-rubberband:
*
* Allow rubberband selection
*/
properties[PROP_ENABLE_RUBBERBAND] =
g_param_spec_boolean ("enable-rubberband",
P_("Enable rubberband selection"),
P_("Allow selecting items by dragging with the mouse"),
FALSE,
G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (gobject_class, N_PROPS, properties);
/**
* GtkGridView::activate:
* @self: The #GtkGridView
* @position: position of item to activate
*
* The ::activate signal is emitted when a cell has been activated by the user,
* usually via activating the GtkGridView|list.activate-item action.
*
* This allows for a convenient way to handle activation in a gridview.
* See GtkListItem:activatable for details on how to use this signal.
*/
signals[ACTIVATE] =
g_signal_new (I_("activate"),
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL,
g_cclosure_marshal_VOID__UINT,
G_TYPE_NONE, 1,
G_TYPE_UINT);
g_signal_set_va_marshaller (signals[ACTIVATE],
G_TYPE_FROM_CLASS (gobject_class),
g_cclosure_marshal_VOID__UINTv);
/**
* GtkGridView|list.activate-item:
* @position: position of item to activate
*
* Activates the item given in @position by emitting the GtkGridView::activate
* signal.
*/
gtk_widget_class_install_action (widget_class,
"list.activate-item",
"u",
gtk_grid_view_activate_item);
gtk_widget_class_set_css_name (widget_class, I_("gridview"));
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_GRID);
}
static void
gtk_grid_view_init (GtkGridView *self)
{
self->item_manager = gtk_list_base_get_manager (GTK_LIST_BASE (self));
self->min_columns = 1;
self->max_columns = DEFAULT_MAX_COLUMNS;
self->n_columns = 1;
gtk_list_base_set_anchor_max_widgets (GTK_LIST_BASE (self),
self->max_columns * GTK_GRID_VIEW_MAX_VISIBLE_ROWS,
self->max_columns);
gtk_widget_add_css_class (GTK_WIDGET (self), "view");
}
/**
* gtk_grid_view_new:
* @model: (allow-none) (transfer full): the model to use, or %NULL
* @factory: (allow-none) (transfer full): The factory to populate items with, or %NULL
*
* Creates a new #GtkGridView that uses the given @factory for
* mapping items to widgets.
*
* The function takes ownership of the
* arguments, so you can write code like
* ```
* grid_view = gtk_grid_view_new (create_model (),
* gtk_builder_list_item_factory_new_from_resource ("/resource.ui"));
* ```
*
* Returns: a new #GtkGridView using the given @model and @factory
**/
GtkWidget *
gtk_grid_view_new (GtkSelectionModel *model,
GtkListItemFactory *factory)
{
GtkWidget *result;
g_return_val_if_fail (model == NULL || GTK_IS_SELECTION_MODEL (model), NULL);
g_return_val_if_fail (factory == NULL || GTK_IS_LIST_ITEM_FACTORY (factory), NULL);
result = g_object_new (GTK_TYPE_GRID_VIEW,
"model", model,
"factory", factory,
NULL);
/* consume the references */
g_clear_object (&model);
g_clear_object (&factory);
return result;
}
/**
* gtk_grid_view_get_model:
* @self: a #GtkGridView
*
* Gets the model that's currently used to read the items displayed.
*
* Returns: (nullable) (transfer none): The model in use
**/
GtkSelectionModel *
gtk_grid_view_get_model (GtkGridView *self)
{
g_return_val_if_fail (GTK_IS_GRID_VIEW (self), NULL);
return gtk_list_base_get_model (GTK_LIST_BASE (self));
}
/**
* gtk_grid_view_set_model:
* @self: a #GtkGridView
* @model: (allow-none) (transfer none): the model to use or %NULL for none
*
* Sets the #GtkSelectionModel to use for
**/
void
gtk_grid_view_set_model (GtkGridView *self,
GtkSelectionModel *model)
{
g_return_if_fail (GTK_IS_GRID_VIEW (self));
g_return_if_fail (model == NULL || GTK_IS_SELECTION_MODEL (model));
if (!gtk_list_base_set_model (GTK_LIST_BASE (self), model))
return;
gtk_accessible_update_property (GTK_ACCESSIBLE (self),
GTK_ACCESSIBLE_PROPERTY_MULTI_SELECTABLE, GTK_IS_MULTI_SELECTION (model),
-1);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MODEL]);
}
/**
* gtk_grid_view_get_factory:
* @self: a #GtkGridView
*
* Gets the factory that's currently used to populate list items.
*
* Returns: (nullable) (transfer none): The factory in use
**/
GtkListItemFactory *
gtk_grid_view_get_factory (GtkGridView *self)
{
g_return_val_if_fail (GTK_IS_GRID_VIEW (self), NULL);
return gtk_list_item_manager_get_factory (self->item_manager);
}
/**
* gtk_grid_view_set_factory:
* @self: a #GtkGridView
* @factory: (allow-none) (transfer none): the factory to use or %NULL for none
*
* Sets the #GtkListItemFactory to use for populating list items.
**/
void
gtk_grid_view_set_factory (GtkGridView *self,
GtkListItemFactory *factory)
{
g_return_if_fail (GTK_IS_GRID_VIEW (self));
g_return_if_fail (factory == NULL || GTK_LIST_ITEM_FACTORY (factory));
if (factory == gtk_list_item_manager_get_factory (self->item_manager))
return;
gtk_list_item_manager_set_factory (self->item_manager, factory);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_FACTORY]);
}
/**
* gtk_grid_view_get_max_columns:
* @self: a #GtkGridView
*
* Gets the maximum number of columns that the grid will use.
*
* Returns: The maximum number of columns
**/
guint
gtk_grid_view_get_max_columns (GtkGridView *self)
{
g_return_val_if_fail (GTK_IS_GRID_VIEW (self), DEFAULT_MAX_COLUMNS);
return self->max_columns;
}
/**
* gtk_grid_view_set_max_columns:
* @self: a #GtkGridView
* @max_columns: The maximum number of columns
*
* Sets the maximum number of columns to use. This number must be at least 1.
*
* If @max_columns is smaller than the minimum set via
* gtk_grid_view_set_min_columns(), that value is used instead.
**/
void
gtk_grid_view_set_max_columns (GtkGridView *self,
guint max_columns)
{
g_return_if_fail (GTK_IS_GRID_VIEW (self));
g_return_if_fail (max_columns > 0);
if (self->max_columns == max_columns)
return;
self->max_columns = max_columns;
gtk_list_base_set_anchor_max_widgets (GTK_LIST_BASE (self),
self->max_columns * GTK_GRID_VIEW_MAX_VISIBLE_ROWS,
self->max_columns);
gtk_widget_queue_resize (GTK_WIDGET (self));
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MAX_COLUMNS]);
}
/**
* gtk_grid_view_get_min_columns:
* @self: a #GtkGridView
*
* Gets the minimum number of columns that the grid will use.
*
* Returns: The minimum number of columns
**/
guint
gtk_grid_view_get_min_columns (GtkGridView *self)
{
g_return_val_if_fail (GTK_IS_GRID_VIEW (self), 1);
return self->min_columns;
}
/**
* gtk_grid_view_set_min_columns:
* @self: a #GtkGridView
* @min_columns: The minimum number of columns
*
* Sets the minimum number of columns to use. This number must be at least 1.
*
* If @min_columns is smaller than the minimum set via
* gtk_grid_view_set_max_columns(), that value is ignored.
**/
void
gtk_grid_view_set_min_columns (GtkGridView *self,
guint min_columns)
{
g_return_if_fail (GTK_IS_GRID_VIEW (self));
g_return_if_fail (min_columns > 0);
if (self->min_columns == min_columns)
return;
self->min_columns = min_columns;
gtk_widget_queue_resize (GTK_WIDGET (self));
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MIN_COLUMNS]);
}
/**
* gtk_grid_view_set_single_click_activate:
* @self: a #GtkGridView
* @single_click_activate: %TRUE to activate items on single click
*
* Sets whether items should be activated on single click and
* selected on hover.
*/
void
gtk_grid_view_set_single_click_activate (GtkGridView *self,
gboolean single_click_activate)
{
g_return_if_fail (GTK_IS_GRID_VIEW (self));
if (single_click_activate == gtk_list_item_manager_get_single_click_activate (self->item_manager))
return;
gtk_list_item_manager_set_single_click_activate (self->item_manager, single_click_activate);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SINGLE_CLICK_ACTIVATE]);
}
/**
* gtk_grid_view_get_single_click_activate:
* @self: a #GtkListView
*
* Returns whether items will be activated on single click and
* selected on hover.
*
* Returns: %TRUE if items are activated on single click
*/
gboolean
gtk_grid_view_get_single_click_activate (GtkGridView *self)
{
g_return_val_if_fail (GTK_IS_GRID_VIEW (self), FALSE);
return gtk_list_item_manager_get_single_click_activate (self->item_manager);
}
/**
* gtk_grid_view_set_enable_rubberband:
* @self: a #GtkGridView
* @enable_rubberband: %TRUE to enable rubberband selection
*
* Sets whether selections can be changed by dragging with the mouse.
*/
void
gtk_grid_view_set_enable_rubberband (GtkGridView *self,
gboolean enable_rubberband)
{
g_return_if_fail (GTK_IS_GRID_VIEW (self));
if (enable_rubberband == gtk_list_base_get_enable_rubberband (GTK_LIST_BASE (self)))
return;
gtk_list_base_set_enable_rubberband (GTK_LIST_BASE (self), enable_rubberband);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ENABLE_RUBBERBAND]);
}
/**
* gtk_grid_view_get_enable_rubberband:
* @self: a #GtkGridView
*
* Returns whether rows can be selected by dragging with the mouse.
*
* Returns: %TRUE if rubberband selection is enabled
*/
gboolean
gtk_grid_view_get_enable_rubberband (GtkGridView *self)
{
g_return_val_if_fail (GTK_IS_GRID_VIEW (self), FALSE);
return gtk_list_base_get_enable_rubberband (GTK_LIST_BASE (self));
}
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