[gtk/wip/otte/listview: 225/309] gridview: Actually do something
- From: Benjamin Otte <otte src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/otte/listview: 225/309] gridview: Actually do something
- Date: Fri, 29 May 2020 20:31:27 +0000 (UTC)
commit 96c6246786d22e1d886bea69aed81c17d0b69ae1
Author: Benjamin Otte <otte redhat com>
Date: Sat Oct 12 22:53:13 2019 +0200
gridview: Actually do something
Implement measuring and allocating items - which makes the items appear
when drawing and allows interacting with the items.
However, the gridview still does not allow any user interaction
(including scrolling).
gtk/gtkgridview.c | 515 +++++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 469 insertions(+), 46 deletions(-)
---
diff --git a/gtk/gtkgridview.c b/gtk/gtkgridview.c
index 3f3ecc72da..9972d19a6b 100644
--- a/gtk/gtkgridview.c
+++ b/gtk/gtkgridview.c
@@ -28,7 +28,18 @@
#include "gtkorientableprivate.h"
#include "gtkprivate.h"
#include "gtkscrollable.h"
+#include "gtksingleselection.h"
#include "gtktypebuiltins.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_MIN_VISIBLE_ROWS (30)
#define DEFAULT_MAX_COLUMNS (7)
@@ -55,22 +66,24 @@ struct _GtkGridView
GtkOrientation orientation;
guint min_columns;
guint max_columns;
+ /* set in size_allocate */
+ guint n_columns;
+ double column_width;
+
+ GtkListItemTracker *anchor;
+ double anchor_align;
};
struct _Cell
{
GtkListItemManagerItem parent;
- guint size_first_row; /* total */
- guint size; /* total */
- guint size_last_row; /* total */
+ guint size; /* total, only counting cells in first column */
};
struct _CellAugment
{
GtkListItemManagerItemAugment parent;
- guint size_first_row; /* total */
- guint size; /* total */
- guint size_last_row; /* total */
+ guint size; /* total, only counting first column */
};
enum
@@ -95,6 +108,50 @@ G_DEFINE_TYPE_WITH_CODE (GtkGridView, gtk_grid_view, GTK_TYPE_WIDGET,
static GParamSpec *properties[N_PROPS] = { NULL, };
+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
+gtk_grid_view_set_anchor (GtkGridView *self,
+ guint position,
+ double align)
+{
+ gtk_list_item_tracker_set_position (self->item_manager,
+ self->anchor,
+ 0,
+ (GTK_GRID_VIEW_MIN_VISIBLE_ROWS * align + 1) * self->max_columns,
+ (GTK_GRID_VIEW_MIN_VISIBLE_ROWS * (1 - align) + 1) *
self->max_columns);
+ if (self->anchor_align != align)
+ {
+ self->anchor_align = align;
+ gtk_widget_queue_allocate (GTK_WIDGET (self));
+ }
+}
+
static void
gtk_grid_view_adjustment_value_changed_cb (GtkAdjustment *adjustment,
GtkGridView *self)
@@ -102,10 +159,186 @@ gtk_grid_view_adjustment_value_changed_cb (GtkAdjustment *adjustment,
gtk_widget_queue_allocate (GTK_WIDGET (self));
}
-static gboolean
-gtk_grid_view_is_empty (GtkGridView *self)
+static void
+gtk_grid_view_update_adjustments (GtkGridView *self,
+ GtkOrientation orientation)
+{
+ g_signal_handlers_block_by_func (self->adjustment[orientation],
+ gtk_grid_view_adjustment_value_changed_cb,
+ self);
+ gtk_adjustment_configure (self->adjustment[orientation],
+ 0,
+ 0,
+ 0,
+ 0,
+ 0,
+ 0);
+ g_signal_handlers_unblock_by_func (self->adjustment[orientation],
+ gtk_grid_view_adjustment_value_changed_cb,
+ self);
+}
+
+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)
{
- return self->model == NULL;
+ GtkOrientation opposite;
+ Cell *cell;
+ int min, nat, child_min, child_nat;
+
+ min = 0;
+ nat = 0;
+ opposite = OPPOSITE_ORIENTATION (self->orientation);
+
+ 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 (self->scroll_policy[OPPOSITE_ORIENTATION (self->orientation)] == 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);
+ 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;
+
+ 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,
+ self->orientation, column_size,
+ &child_min, &child_nat, NULL, NULL);
+ if (self->scroll_policy[self->orientation] == 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
@@ -119,44 +352,215 @@ gtk_grid_view_measure (GtkWidget *widget,
{
GtkGridView *self = GTK_GRID_VIEW (widget);
- if (gtk_grid_view_is_empty (self))
- {
- *minimum = 0;
- *natural = 0;
- return;
- }
-
- *minimum = 0;
- *natural = 0;
- return;
+ if (orientation == self->orientation)
+ gtk_grid_view_measure_list (widget, for_size, minimum, natural);
+ else
+ gtk_grid_view_measure_across (widget, for_size, minimum, natural);
}
static void
-gtk_grid_view_size_allocate (GtkWidget *widget,
- int width,
- int height,
- int baseline)
+cell_set_size (Cell *cell,
+ guint size)
{
- //GtkGridView *self = GTK_GRID_VIEW (widget);
+ if (cell->size == size)
+ return;
+
+ cell->size = size;
+ gtk_rb_tree_node_mark_dirty (cell);
}
static void
-gtk_grid_view_model_items_changed_cb (GListModel *model,
- guint position,
- guint removed,
- guint added,
- GtkGridView *self)
+gtk_grid_view_size_allocate_child (GtkGridView *self,
+ GtkWidget *child,
+ int x,
+ int y,
+ int width,
+ int height)
{
+ GtkAllocation child_allocation;
+
+ if (self->orientation == 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_clear_model (GtkGridView *self)
+gtk_grid_view_size_allocate (GtkWidget *widget,
+ int width,
+ int height,
+ int baseline)
{
- if (self->model == NULL)
+ GtkGridView *self = GTK_GRID_VIEW (widget);
+ Cell *cell, *start;
+ GArray *heights;
+ int unknown_height, row_height, col_min, col_nat;
+ GtkOrientation opposite_orientation;
+ gboolean known;
+ int x, y;
+ guint i;
+
+ opposite_orientation = OPPOSITE_ORIENTATION (self->orientation);
+
+ /* step 0: exit early if list is empty */
+ if (gtk_list_item_manager_get_root (self->item_manager) == NULL)
return;
- g_signal_handlers_disconnect_by_func (self->model, gtk_grid_view_model_items_changed_cb, self);
- g_clear_object (&self->model);
+ /* 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,
+ self->orientation == GTK_ORIENTATION_VERTICAL ? width :
height,
+ col_min, col_nat);
+ self->column_width = (self->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, self->orientation,
+ self->column_width,
+ &min, &nat, NULL, NULL);
+ if (self->scroll_policy[self->orientation] == GTK_SCROLL_MINIMUM)
+ size = min;
+ else
+ size = nat;
+ 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 */
+ unknown_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 + unknown_height);
+
+ i -= self->n_columns;
+ known = FALSE;
+
+ if (i >= self->n_columns)
+ {
+ cell_set_size (cell, cell->size + unknown_height * (i / self->n_columns));
+ i %= self->n_columns;
+ }
+ start = cell;
+ }
+ }
+ if (i > 0 && !known)
+ cell_set_size (start, start->size + unknown_height);
+
+ /* step 4: update the adjustments */
+ gtk_grid_view_update_adjustments (self, GTK_ORIENTATION_HORIZONTAL);
+ gtk_grid_view_update_adjustments (self, GTK_ORIENTATION_VERTICAL);
+
+ /* step 5: actually allocate the widgets */
+ x = - round (gtk_adjustment_get_value (self->adjustment[opposite_orientation]));
+ y = - round (gtk_adjustment_get_value (self->adjustment[self->orientation]));
+
+ 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)
+ {
+ if (i == 0)
+ {
+ y += row_height;
+ 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 = (i + 1) % self->n_columns;
+ }
+ else
+ {
+ i += cell->parent.n_items;
+ if (i > self->n_columns)
+ {
+ i -= self->n_columns;
+ y += row_height;
+ row_height = cell->size;
+
+ if (i > self->n_columns)
+ {
+ guint unknown_rows = (i - 1) / self->n_columns;
+ int unknown_height2 = unknown_rows * unknown_height;
+ row_height -= unknown_height2;
+ y += unknown_height2;
+ i %= self->n_columns;
+ }
+ }
+ }
+ }
}
static void
@@ -177,11 +581,16 @@ gtk_grid_view_dispose (GObject *object)
{
GtkGridView *self = GTK_GRID_VIEW (object);
- gtk_grid_view_clear_model (self);
+ g_clear_object (&self->model);
gtk_grid_view_clear_adjustment (self, GTK_ORIENTATION_HORIZONTAL);
gtk_grid_view_clear_adjustment (self, GTK_ORIENTATION_VERTICAL);
+ if (self->anchor)
+ {
+ gtk_list_item_tracker_free (self->item_manager, self->anchor);
+ self->anchor = NULL;
+ }
g_clear_object (&self->item_manager);
G_OBJECT_CLASS (gtk_grid_view_parent_class)->dispose (object);
@@ -449,34 +858,33 @@ cell_augment (GtkRbTree *tree,
gpointer left,
gpointer right)
{
-#if 0
Cell *cell = node;
CellAugment *aug = node_augment;
gtk_list_item_manager_augment_node (tree, node_augment, node, left, right);
- aug->height = row->height * row->parent.n_items;
+ aug->size = cell->size;
if (left)
{
- ListRowAugment *left_aug = gtk_rb_tree_get_augment (tree, left);
+ CellAugment *left_aug = gtk_rb_tree_get_augment (tree, left);
- aug->height += left_aug->height;
+ aug->size += left_aug->size;
}
if (right)
{
- ListRowAugment *right_aug = gtk_rb_tree_get_augment (tree, right);
+ CellAugment *right_aug = gtk_rb_tree_get_augment (tree, right);
- aug->height += right_aug->height;
+ aug->size += right_aug->size;
}
-#endif
}
static void
gtk_grid_view_init (GtkGridView *self)
{
self->item_manager = gtk_list_item_manager_new (GTK_WIDGET (self), "flowboxchild", Cell, CellAugment,
cell_augment);
+ self->anchor = gtk_list_item_tracker_new (self->item_manager);
self->min_columns = 1;
self->max_columns = DEFAULT_MAX_COLUMNS;
@@ -573,16 +981,27 @@ gtk_grid_view_set_model (GtkGridView *self,
if (self->model == model)
return;
- gtk_grid_view_clear_model (self);
+ g_clear_object (&self->model);
if (model)
{
+ GtkSelectionModel *selection_model;
+
self->model = g_object_ref (model);
- g_signal_connect (model,
- "items-changed",
- G_CALLBACK (gtk_grid_view_model_items_changed_cb),
- self);
+ 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);
+
+ 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]);
@@ -664,6 +1083,10 @@ gtk_grid_view_set_max_columns (GtkGridView *self,
self->max_columns = max_columns;
+ gtk_grid_view_set_anchor (self,
+ gtk_list_item_tracker_get_position (self->item_manager, self->anchor),
+ self->anchor_align);
+
gtk_widget_queue_resize (GTK_WIDGET (self));
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MAX_COLUMNS]);
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