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gtk2/gtk/gtkgridview.c
Benjamin Otte 33c6b428f7 listbase: Add vfuncs to convert positions to/from coordinates 
... and use that to implement PageUp/PageDown.

With that, all keyboard handling has been moved to GtkListBase.
2020-05-30 19:26:46 -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 "gtkintl.h"
#include "gtklistbaseprivate.h"
#include "gtklistitemfactory.h"
#include "gtklistitemmanagerprivate.h"
#include "gtkmain.h"
#include "gtkprivate.h"
#include "gtksingleselection.h"
#include "gtkwidgetprivate.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 lists in a grid
* @see_also: #GListModel
*
* GtkGridView is a widget to present a view into a large dynamic grid of items.
*/
typedef struct _Cell Cell;
typedef struct _CellAugment CellAugment;
struct _GtkGridView
{
GtkListBase parent_instance;
GListModel *model;
GtkListItemManager *item_manager;
guint min_columns;
guint max_columns;
/* set in size_allocate */
guint n_columns;
double column_width;
int unknown_row_height;
GtkListItemTracker *anchor;
double anchor_xalign;
double anchor_yalign;
guint anchor_xstart : 1;
guint anchor_ystart : 1;
/* the item that has input focus */
GtkListItemTracker *focus;
};
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,
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 emtpy 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 = pos - pos % self->n_columns;
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 void
gtk_grid_view_set_anchor (GtkGridView *self,
guint position,
double xalign,
gboolean xstart,
double yalign,
gboolean ystart)
{
gtk_list_item_tracker_set_position (self->item_manager,
self->anchor,
position,
(ceil (GTK_GRID_VIEW_MAX_VISIBLE_ROWS * yalign) + 1) * self->max_columns,
(ceil (GTK_GRID_VIEW_MAX_VISIBLE_ROWS * (1 - yalign)) + 1) * self->max_columns);
if (self->anchor_xalign != xalign ||
self->anchor_xstart != xstart ||
self->anchor_yalign != yalign ||
self->anchor_ystart != ystart)
{
self->anchor_xalign = xalign;
self->anchor_xstart = xstart;
self->anchor_yalign = yalign;
self->anchor_ystart = ystart;
gtk_widget_queue_allocate (GTK_WIDGET (self));
}
}
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 = self->model ? g_list_model_get_n_items (self->model) : 0;
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 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 = self->model ? g_list_model_get_n_items (self->model) : 0;
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)
{
GtkGridView *self = GTK_GRID_VIEW (base);
if (steps < 0)
return pos - MIN (pos, -steps);
else
{
guint n_items = self->model ? g_list_model_get_n_items (self->model) : 0;
pos += MIN (n_items - pos - 1, steps);
}
return pos;
}
static void
gtk_grid_view_adjustment_value_changed (GtkListBase *base,
GtkOrientation orientation)
{
GtkGridView *self = GTK_GRID_VIEW (base);
int page_size, total_size, value, from_start;
guint pos, anchor_pos, n_items;
int offset, height, top, bottom;
double xalign, yalign;
gboolean xstart, ystart;
gtk_list_base_get_adjustment_values (base, orientation, &value, &total_size, &page_size);
anchor_pos = gtk_list_item_tracker_get_position (self->item_manager, self->anchor);
n_items = g_list_model_get_n_items (self->model);
if (orientation == gtk_list_base_get_orientation (GTK_LIST_BASE (self)))
{
/* Compute how far down we've scrolled. That's the height
* we want to align to. */
yalign = (double) value / (total_size - page_size);
from_start = round (yalign * page_size);
/* We want the cell that far down the page */
if (gtk_grid_view_get_cell_at_y (self,
value + from_start,
&pos,
&offset,
&height))
{
/* offset from value - which is where we wanna scroll to */
top = from_start - offset;
bottom = top + height;
/* find an anchor that is in the visible area */
if (top > 0 && bottom < page_size)
ystart = from_start - top <= bottom - from_start;
else if (top > 0)
ystart = TRUE;
else if (bottom < page_size)
ystart = FALSE;
else
{
/* This is the case where the cell occupies the whole visible area.
* It's also the only case where align will not end up in [0..1] */
ystart = from_start - top <= bottom - from_start;
}
/* Now compute the align so that when anchoring to the looked
* up cell, the position is pixel-exact.
*/
yalign = (double) (ystart ? top : bottom) / page_size;
}
else
{
/* Happens if we scroll down to the end - we will query
* exactly the pixel behind the last one we can get a cell for.
* So take the last row. */
pos = n_items - 1;
pos = pos - pos % self->n_columns;
yalign = 1.0;
ystart = FALSE;
}
/* And finally, keep the column anchor intact. */
anchor_pos %= self->n_columns;
pos += anchor_pos;
xstart = self->anchor_xstart;
xalign = self->anchor_xalign;
}
else
{
xalign = (double) value / (total_size - page_size);
from_start = round (xalign * page_size);
pos = floor ((value + from_start) / self->column_width);
if (pos >= self->n_columns)
{
/* scrolling to the end sets pos to exactly self->n_columns */
pos = self->n_columns - 1;
xstart = FALSE;
xalign = 1.0;
}
else
{
top = ceil (self->column_width * pos) - value;
bottom = ceil (self->column_width * (pos + 1)) - value;
/* offset from value - which is where we wanna scroll to */
/* find an anchor that is in the visible area */
if (top > 0 && bottom < page_size)
xstart = from_start - top <= bottom - from_start;
else if (top > 0)
xstart = TRUE;
else if (bottom < page_size)
xstart = FALSE;
else
xstart = from_start - top <= bottom - from_start;
xalign = (double) (xstart ? top : bottom) / page_size;
}
/* And finally, keep the row anchor intact. */
pos += (anchor_pos - anchor_pos % self->n_columns);
yalign = self->anchor_yalign;
ystart = self->anchor_ystart;
}
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... */
gtk_list_base_get_adjustment_values (base,
gtk_list_base_get_opposite_orientation (base),
&value, &total_size, &page_size);
pos = n_items - 1;
xstart = FALSE;
xalign = (ceil (self->column_width * (pos % self->n_columns + 1)) - value) / page_size;
}
gtk_grid_view_set_anchor (self, pos, xalign, xstart, yalign, ystart);
gtk_widget_queue_allocate (GTK_WIDGET (self));
}
static int
gtk_grid_view_update_adjustment (GtkGridView *self,
GtkOrientation orientation)
{
int value, page_size, cell_size, total_size;
guint anchor_pos;
anchor_pos = gtk_list_item_tracker_get_position (self->item_manager, self->anchor);
if (anchor_pos == GTK_INVALID_LIST_POSITION)
return gtk_list_base_set_adjustment_values (GTK_LIST_BASE (self), orientation, 0, 0, 0);
page_size = gtk_widget_get_size (GTK_WIDGET (self), orientation);
if (gtk_list_base_get_orientation (GTK_LIST_BASE (self)) == orientation)
{
Cell *cell;
CellAugment *aug;
cell = gtk_list_item_manager_get_root (self->item_manager);
g_assert (cell);
aug = gtk_list_item_manager_get_item_augment (self->item_manager, cell);
if (!gtk_list_base_get_allocation_along (GTK_LIST_BASE (self),
anchor_pos,
&value,
&cell_size))
{
g_assert_not_reached ();
}
if (!self->anchor_ystart)
value += cell_size;
value = gtk_list_base_set_adjustment_values (GTK_LIST_BASE (self),
orientation,
value - self->anchor_yalign * page_size,
aug->size,
page_size);
}
else
{
guint i = anchor_pos % self->n_columns;
if (self->anchor_xstart)
value = ceil (self->column_width * i);
else
value = ceil (self->column_width * (i + 1));
total_size = round (self->n_columns * self->column_width);
value = gtk_list_base_set_adjustment_values (GTK_LIST_BASE (self),
orientation,
value - self->anchor_xalign * page_size,
total_size,
page_size);
}
return value;
}
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 void
gtk_grid_view_size_allocate_child (GtkGridView *self,
GtkWidget *child,
int x,
int y,
int width,
int height)
{
GtkAllocation child_allocation;
if (gtk_list_base_get_orientation (GTK_LIST_BASE (self)) == GTK_ORIENTATION_VERTICAL)
{
child_allocation.x = x;
child_allocation.y = y;
child_allocation.width = width;
child_allocation.height = height;
}
else if (_gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_LTR)
{
child_allocation.x = y;
child_allocation.y = x;
child_allocation.width = height;
child_allocation.height = width;
}
else
{
int mirror_point = gtk_widget_get_width (GTK_WIDGET (self));
child_allocation.x = mirror_point - y - height;
child_allocation.y = x;
child_allocation.width = height;
child_allocation.height = width;
}
gtk_widget_size_allocate (child, &child_allocation, -1);
}
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 */
x = - gtk_grid_view_update_adjustment (self, opposite_orientation);
y = - gtk_grid_view_update_adjustment (self, orientation);
/* 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_grid_view_size_allocate_child (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);
}
}
}
}
static void
gtk_grid_view_dispose (GObject *object)
{
GtkGridView *self = GTK_GRID_VIEW (object);
g_clear_object (&self->model);
if (self->anchor)
{
gtk_list_item_tracker_free (self->item_manager, self->anchor);
self->anchor = NULL;
}
if (self->focus)
{
gtk_list_item_tracker_free (self->item_manager, self->focus);
self->focus = NULL;
}
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, self->model);
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;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_grid_view_compute_scroll_align (GtkGridView *self,
GtkOrientation orientation,
int cell_start,
int cell_end,
double current_align,
gboolean current_start,
double *new_align,
gboolean *new_start)
{
int visible_start, visible_size, visible_end;
int cell_size;
gtk_list_base_get_adjustment_values (GTK_LIST_BASE (self),
orientation,
&visible_start, NULL, &visible_size);
visible_end = visible_start + visible_size;
cell_size = cell_end - cell_start;
if (cell_size <= visible_size)
{
if (cell_start < visible_start)
{
*new_align = 0.0;
*new_start = TRUE;
}
else if (cell_end > visible_end)
{
*new_align = 1.0;
*new_start = FALSE;
}
else
{
/* XXX: start or end here? */
*new_start = TRUE;
*new_align = (double) (cell_start - visible_start) / visible_size;
}
}
else
{
/* This is the unlikely case of the cell being higher than the visible area */
if (cell_start > visible_start)
{
*new_align = 0.0;
*new_start = TRUE;
}
else if (cell_end < visible_end)
{
*new_align = 1.0;
*new_start = FALSE;
}
else
{
/* the cell already covers the whole screen */
*new_align = current_align;
*new_start = current_start;
}
}
}
static void
gtk_grid_view_update_focus_tracker (GtkGridView *self)
{
GtkWidget *focus_child;
guint pos;
focus_child = gtk_widget_get_focus_child (GTK_WIDGET (self));
if (!GTK_IS_LIST_ITEM (focus_child))
return;
pos = gtk_list_item_get_position (GTK_LIST_ITEM (focus_child));
if (pos != gtk_list_item_tracker_get_position (self->item_manager, self->focus))
{
gtk_list_item_tracker_set_position (self->item_manager,
self->focus,
pos,
self->max_columns,
self->max_columns);
}
}
static void
gtk_grid_view_scroll_to_item (GtkWidget *widget,
const char *action_name,
GVariant *parameter)
{
GtkGridView *self = GTK_GRID_VIEW (widget);
int start, end;
double xalign, yalign;
gboolean xstart, ystart;
guint pos;
if (!g_variant_check_format_string (parameter, "u", FALSE))
return;
g_variant_get (parameter, "u", &pos);
/* figure out primary orientation and if position is valid */
if (!gtk_list_base_get_allocation_along (GTK_LIST_BASE (self), pos, &start, &end))
return;
end += start;
gtk_grid_view_compute_scroll_align (self,
gtk_list_base_get_orientation (GTK_LIST_BASE (self)),
start, end,
self->anchor_yalign, self->anchor_ystart,
&yalign, &ystart);
/* now do the same thing with the other orientation */
start = floor (self->column_width * (pos % self->n_columns));
end = floor (self->column_width * ((pos % self->n_columns) + 1));
gtk_grid_view_compute_scroll_align (self,
gtk_list_base_get_opposite_orientation (GTK_LIST_BASE (self)),
start, end,
self->anchor_xalign, self->anchor_xstart,
&xalign, &xstart);
gtk_grid_view_set_anchor (self, pos, xalign, xstart, yalign, ystart);
/* HACK HACK HACK
*
* GTK has no way to track the focused child. But we now that when a listitem
* gets focus, it calls this action. So we update our focus tracker from here
* because it's the closest we can get to accurate tracking.
*/
gtk_grid_view_update_focus_tracker (self);
}
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 (self->model == NULL || pos >= g_list_model_get_n_items (self->model))
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 = "flowboxchild";
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->adjustment_value_changed = gtk_grid_view_adjustment_value_changed;
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_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"),
G_TYPE_LIST_MODEL,
G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
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);
/**
* GtkGridView|list.scroll-to-item:
* @position: position of item to scroll to
*
* Scrolls to the item given in @position with the minimum amount
* of scrolling required. If the item is already visible, nothing happens.
*/
gtk_widget_class_install_action (widget_class,
"list.scroll-to-item",
"u",
gtk_grid_view_scroll_to_item);
gtk_widget_class_set_css_name (widget_class, I_("flowbox"));
}
static void
gtk_grid_view_init (GtkGridView *self)
{
self->item_manager = gtk_list_base_get_manager (GTK_LIST_BASE (self));
self->anchor = gtk_list_item_tracker_new (self->item_manager);
self->anchor_xstart = TRUE;
self->anchor_ystart = TRUE;
self->focus = gtk_list_item_tracker_new (self->item_manager);
self->min_columns = 1;
self->max_columns = DEFAULT_MAX_COLUMNS;
}
/**
* gtk_grid_view_new:
*
* Creates a new empty #GtkGridView.
*
* You most likely want to call gtk_grid_view_set_factory() to
* set up a way to map its items to widgets and gtk_grid_view_set_model()
* to set a model to provide items next.
*
* Returns: a new #GtkGridView
**/
GtkWidget *
gtk_grid_view_new (void)
{
return g_object_new (GTK_TYPE_GRID_VIEW, NULL);
}
/**
* gtk_grid_view_new_with_factory:
* @factory: (transfer full): The factory to populate items with
*
* Creates a new #GtkGridView that uses the given @factory for
* mapping items to widgets.
*
* You most likely want to call gtk_grid_view_set_model() to set
* a model next.
*
* The function takes ownership of the
* argument, so you can write code like
* ```
* grid_view = gtk_grid_view_new_with_factory (
* gtk_builder_list_item_factory_newfrom_resource ("/resource.ui"));
* ```
*
* Returns: a new #GtkGridView using the given @factory
**/
GtkWidget *
gtk_grid_view_new_with_factory (GtkListItemFactory *factory)
{
GtkWidget *result;
g_return_val_if_fail (GTK_IS_LIST_ITEM_FACTORY (factory), NULL);
result = g_object_new (GTK_TYPE_GRID_VIEW,
"factory", factory,
NULL);
g_object_unref (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
**/
GListModel *
gtk_grid_view_get_model (GtkGridView *self)
{
g_return_val_if_fail (GTK_IS_GRID_VIEW (self), NULL);
return self->model;
}
/**
* gtk_grid_view_set_model:
* @self: a #GtkGridView
* @model: (allow-none) (transfer none): the model to use or %NULL for none
*
* Sets the #GListModel to use for
**/
void
gtk_grid_view_set_model (GtkGridView *self,
GListModel *model)
{
g_return_if_fail (GTK_IS_GRID_VIEW (self));
g_return_if_fail (model == NULL || G_IS_LIST_MODEL (model));
if (self->model == model)
return;
g_clear_object (&self->model);
if (model)
{
GtkSelectionModel *selection_model;
self->model = g_object_ref (model);
if (GTK_IS_SELECTION_MODEL (model))
selection_model = GTK_SELECTION_MODEL (g_object_ref (model));
else
selection_model = GTK_SELECTION_MODEL (gtk_single_selection_new (model));
gtk_list_item_manager_set_model (self->item_manager, selection_model);
gtk_grid_view_set_anchor (self, 0, 0.0, TRUE, 0.0, TRUE);
g_object_unref (selection_model);
}
else
{
gtk_list_item_manager_set_model (self->item_manager, NULL);
}
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_grid_view_set_anchor (self,
gtk_list_item_tracker_get_position (self->item_manager, self->anchor),
self->anchor_xalign,
self->anchor_xstart,
self->anchor_yalign,
self->anchor_ystart);
gtk_grid_view_update_focus_tracker (self);
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]);
}
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