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gtk2/gtk/gtklistbase.c
Benjamin Otte e4869938b7 listview: Fix clipping for horizontal listviews 
Fixes a bug introduced with
commit 39645d3258
2022-06-07 19:21:46 +02:00

2153 lines
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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 "gtklistbaseprivate.h"
#include "gtkadjustment.h"
#include "gtkbitset.h"
#include "gtkdragsourceprivate.h"
#include "gtkdropcontrollermotion.h"
#include "gtkgesturedrag.h"
#include "gtkgizmoprivate.h"
#include "gtkintl.h"
#include "gtklistitemwidgetprivate.h"
#include "gtkmultiselection.h"
#include "gtkorientable.h"
#include "gtkscrollable.h"
#include "gtksingleselection.h"
#include "gtksnapshot.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
/* Allow shadows to overdraw without immediately culling the widget at the viewport
* boundary.
* Choose this so that roughly 1 extra widget gets drawn on each side of the viewport,
* but not more. Icons are 16px, text height is somewhere there, too.
*/
#define GTK_LIST_BASE_CHILD_MAX_OVERDRAW 10
typedef struct _RubberbandData RubberbandData;
struct _RubberbandData
{
GtkWidget *widget; /* The rubberband widget */
GtkListItemTracker *start_tracker; /* The item we started dragging on */
double start_align_across; /* alignment in horizontal direction */
double start_align_along; /* alignment in vertical direction */
double pointer_x, pointer_y; /* mouse coordinates in widget space */
};
typedef struct _GtkListBasePrivate GtkListBasePrivate;
struct _GtkListBasePrivate
{
GtkListItemManager *item_manager;
GtkSelectionModel *model;
GtkOrientation orientation;
GtkAdjustment *adjustment[2];
GtkScrollablePolicy scroll_policy[2];
GtkListItemTracker *anchor;
double anchor_align_along;
double anchor_align_across;
GtkPackType anchor_side_along;
GtkPackType anchor_side_across;
guint center_widgets;
guint above_below_widgets;
/* the last item that was selected - basically the location to extend selections from */
GtkListItemTracker *selected;
/* the item that has input focus */
GtkListItemTracker *focus;
gboolean enable_rubberband;
GtkGesture *drag_gesture;
RubberbandData *rubberband;
guint autoscroll_id;
double autoscroll_delta_x;
double autoscroll_delta_y;
};
enum
{
PROP_0,
PROP_HADJUSTMENT,
PROP_HSCROLL_POLICY,
PROP_ORIENTATION,
PROP_VADJUSTMENT,
PROP_VSCROLL_POLICY,
N_PROPS
};
/* HACK: We want the g_class argument in our instance init func and G_DEFINE_TYPE() won't let us */
static void gtk_list_base_init_real (GtkListBase *self, GtkListBaseClass *g_class);
#define g_type_register_static_simple(a,b,c,d,e,evil,f) g_type_register_static_simple(a,b,c,d,e, (GInstanceInitFunc) gtk_list_base_init_real, f);
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GtkListBase, gtk_list_base, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkListBase)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL)
G_IMPLEMENT_INTERFACE (GTK_TYPE_SCROLLABLE, NULL))
#undef g_type_register_static_simple
G_GNUC_UNUSED static void gtk_list_base_init (GtkListBase *self) { }
static GParamSpec *properties[N_PROPS] = { NULL, };
/*
* gtk_list_base_get_position_from_allocation:
* @self: a `GtkListBase`
* @across: position in pixels in the direction cross to the list
* @along: position in pixels in the direction of the list
* @pos: (out caller-allocates): set to the looked up position
* @area: (out caller-allocates) (optional): set to the area occupied
* by the returned position
*
* Given a coordinate in list coordinates, determine the position of the
* item that occupies that position.
*
* It is possible for @area to not include the point given by (across, along).
* This will happen for example in the last row of a gridview, where the
* last item will be returned for the whole width, even if there are empty
* cells.
*
* Returns: %TRUE on success or %FALSE if no position occupies the given offset.
**/
static guint
gtk_list_base_get_position_from_allocation (GtkListBase *self,
int across,
int along,
guint *pos,
cairo_rectangle_int_t *area)
{
return GTK_LIST_BASE_GET_CLASS (self)->get_position_from_allocation (self, across, along, pos, area);
}
static gboolean
gtk_list_base_adjustment_is_flipped (GtkListBase *self,
GtkOrientation orientation)
{
if (orientation == GTK_ORIENTATION_VERTICAL)
return FALSE;
return gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_RTL;
}
static void
gtk_list_base_get_adjustment_values (GtkListBase *self,
GtkOrientation orientation,
int *value,
int *size,
int *page_size)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
int val, upper, ps;
val = gtk_adjustment_get_value (priv->adjustment[orientation]);
upper = gtk_adjustment_get_upper (priv->adjustment[orientation]);
ps = gtk_adjustment_get_page_size (priv->adjustment[orientation]);
if (gtk_list_base_adjustment_is_flipped (self, orientation))
val = upper - ps - val;
if (value)
*value = val;
if (size)
*size = upper;
if (page_size)
*page_size = ps;
}
static void
gtk_list_base_adjustment_value_changed_cb (GtkAdjustment *adjustment,
GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
cairo_rectangle_int_t area, cell_area;
int along, across, total_size;
double align_across, align_along;
GtkPackType side_across, side_along;
guint pos;
gtk_list_base_get_adjustment_values (self, OPPOSITE_ORIENTATION (priv->orientation), &area.x, &total_size, &area.width);
if (total_size == area.width)
align_across = 0.5;
else if (adjustment != priv->adjustment[priv->orientation])
align_across = CLAMP (priv->anchor_align_across, 0, 1);
else
align_across = (double) area.x / (total_size - area.width);
across = area.x + round (align_across * area.width);
across = CLAMP (across, 0, total_size - 1);
gtk_list_base_get_adjustment_values (self, priv->orientation, &area.y, &total_size, &area.height);
if (total_size == area.height)
align_along = 0.5;
else if (adjustment != priv->adjustment[OPPOSITE_ORIENTATION(priv->orientation)])
align_along = CLAMP (priv->anchor_align_along, 0, 1);
else
align_along = (double) area.y / (total_size - area.height);
along = area.y + round (align_along * area.height);
along = CLAMP (along, 0, total_size - 1);
if (!gtk_list_base_get_position_from_allocation (self,
across, along,
&pos,
&cell_area))
{
g_warning ("%s failed to scroll to given position. Ignoring...", G_OBJECT_TYPE_NAME (self));
return;
}
/* find an anchor that is in the visible area */
if (cell_area.x < area.x && cell_area.x + cell_area.width <= area.x + area.width)
side_across = GTK_PACK_END;
else if (cell_area.x >= area.x && cell_area.x + cell_area.width > area.x + area.width)
side_across = GTK_PACK_START;
else if (cell_area.x + cell_area.width / 2 > across)
side_across = GTK_PACK_END;
else
side_across = GTK_PACK_START;
if (cell_area.y < area.y && cell_area.y + cell_area.height <= area.y + area.height)
side_along = GTK_PACK_END;
else if (cell_area.y >= area.y && cell_area.y + cell_area.height > area.y + area.height)
side_along = GTK_PACK_START;
else if (cell_area.y + cell_area.height / 2 > along)
side_along = GTK_PACK_END;
else
side_along = GTK_PACK_START;
/* Compute the align based on side to keep the values identical */
if (side_across == GTK_PACK_START)
align_across = (double) (cell_area.x - area.x) / area.width;
else
align_across = (double) (cell_area.x + cell_area.width - area.x) / area.width;
if (side_along == GTK_PACK_START)
align_along = (double) (cell_area.y - area.y) / area.height;
else
align_along = (double) (cell_area.y + cell_area.height - area.y) / area.height;
gtk_list_base_set_anchor (self,
pos,
align_across, side_across,
align_along, side_along);
gtk_widget_queue_allocate (GTK_WIDGET (self));
}
static void
gtk_list_base_clear_adjustment (GtkListBase *self,
GtkOrientation orientation)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (priv->adjustment[orientation] == NULL)
return;
g_signal_handlers_disconnect_by_func (priv->adjustment[orientation],
gtk_list_base_adjustment_value_changed_cb,
self);
g_clear_object (&priv->adjustment[orientation]);
}
/*
* gtk_list_base_move_focus_along:
* @self: a `GtkListBase`
* @pos: position from which to move focus
* @steps: steps to move focus - negative numbers move focus backwards
*
* Moves focus @steps in the direction of the list.
* If focus cannot be moved, @pos is returned.
* If focus should be moved out of the widget, %GTK_INVALID_LIST_POSITION
* is returned.
*
* Returns: new focus position
**/
static guint
gtk_list_base_move_focus_along (GtkListBase *self,
guint pos,
int steps)
{
return GTK_LIST_BASE_GET_CLASS (self)->move_focus_along (self, pos, steps);
}
/*
* gtk_list_base_move_focus_across:
* @self: a `GtkListBase`
* @pos: position from which to move focus
* @steps: steps to move focus - negative numbers move focus backwards
*
* Moves focus @steps in the direction across the list.
* If focus cannot be moved, @pos is returned.
* If focus should be moved out of the widget, %GTK_INVALID_LIST_POSITION
* is returned.
*
* Returns: new focus position
**/
static guint
gtk_list_base_move_focus_across (GtkListBase *self,
guint pos,
int steps)
{
return GTK_LIST_BASE_GET_CLASS (self)->move_focus_across (self, pos, steps);
}
static guint
gtk_list_base_move_focus (GtkListBase *self,
guint pos,
GtkOrientation orientation,
int steps)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (orientation == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_RTL)
steps = -steps;
if (orientation == priv->orientation)
return gtk_list_base_move_focus_along (self, pos, steps);
else
return gtk_list_base_move_focus_across (self, pos, steps);
}
/*
* gtk_list_base_get_allocation_along:
* @self: a `GtkListBase`
* @pos: item to get the size of
* @offset: (out caller-allocates) (optional): set to the offset
* of the top/left of the item
* @size: (out caller-allocates) (optional): set to the size of
* the item in the direction
*
* Computes the allocation of the item in the direction along the sizing
* axis.
*
* Returns: %TRUE if the item exists and has an allocation, %FALSE otherwise
**/
static gboolean
gtk_list_base_get_allocation_along (GtkListBase *self,
guint pos,
int *offset,
int *size)
{
return GTK_LIST_BASE_GET_CLASS (self)->get_allocation_along (self, pos, offset, size);
}
/*
* gtk_list_base_get_allocation_across:
* @self: a `GtkListBase`
* @pos: item to get the size of
* @offset: (out caller-allocates) (optional): set to the offset
* of the top/left of the item
* @size: (out caller-allocates) (optional): set to the size of
* the item in the direction
*
* Computes the allocation of the item in the direction across to the sizing
* axis.
*
* Returns: %TRUE if the item exists and has an allocation, %FALSE otherwise
**/
static gboolean
gtk_list_base_get_allocation_across (GtkListBase *self,
guint pos,
int *offset,
int *size)
{
return GTK_LIST_BASE_GET_CLASS (self)->get_allocation_across (self, pos, offset, size);
}
/*
* gtk_list_base_select_item:
* @self: a `GtkListBase`
* @pos: item to select
* @modify: %TRUE if the selection should be modified, %FALSE
* if a new selection should be done. This is usually set
* to %TRUE if the user keeps the <Shift> key pressed.
* @extend_pos: %TRUE if the selection should be extended.
* Selections are usually extended from the last selected
* position if the user presses the <Ctrl> key.
*
* Selects the item at @pos according to how GTK list widgets modify
* selections, both when clicking rows with the mouse or when using
* the keyboard.
**/
void
gtk_list_base_select_item (GtkListBase *self,
guint pos,
gboolean modify,
gboolean extend)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkSelectionModel *model;
gboolean success = FALSE;
guint n_items;
model = gtk_list_item_manager_get_model (priv->item_manager);
if (model == NULL)
return;
n_items = g_list_model_get_n_items (G_LIST_MODEL (model));
if (pos >= n_items)
return;
if (extend)
{
guint extend_pos = gtk_list_item_tracker_get_position (priv->item_manager, priv->selected);
if (extend_pos < n_items)
{
guint max = MAX (extend_pos, pos);
guint min = MIN (extend_pos, pos);
if (modify)
{
if (gtk_selection_model_is_selected (model, extend_pos))
{
success = gtk_selection_model_select_range (model,
min,
max - min + 1,
FALSE);
}
else
{
success = gtk_selection_model_unselect_range (model,
min,
max - min + 1);
}
}
else
{
success = gtk_selection_model_select_range (model,
min,
max - min + 1,
TRUE);
}
}
/* If there's no range to select or selecting ranges isn't supported
* by the model, fall through to normal setting.
*/
}
if (success)
return;
if (modify)
{
if (gtk_selection_model_is_selected (model, pos))
gtk_selection_model_unselect_item (model, pos);
else
gtk_selection_model_select_item (model, pos, FALSE);
}
else
{
gtk_selection_model_select_item (model, pos, TRUE);
}
gtk_list_item_tracker_set_position (priv->item_manager,
priv->selected,
pos,
0, 0);
}
guint
gtk_list_base_get_n_items (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (priv->model == NULL)
return 0;
return g_list_model_get_n_items (G_LIST_MODEL (priv->model));
}
guint
gtk_list_base_get_focus_position (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
return gtk_list_item_tracker_get_position (priv->item_manager, priv->focus);
}
static gboolean
gtk_list_base_focus (GtkWidget *widget,
GtkDirectionType direction)
{
GtkListBase *self = GTK_LIST_BASE (widget);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
guint old, pos, n_items;
GtkWidget *focus_child;
GtkListItemManagerItem *item;
focus_child = gtk_widget_get_focus_child (widget);
/* focus is moving around fine inside the focus child, don't disturb it */
if (focus_child && gtk_widget_child_focus (focus_child, direction))
return TRUE;
pos = gtk_list_base_get_focus_position (self);
n_items = gtk_list_base_get_n_items (self);
old = pos;
if (pos >= n_items)
{
if (n_items == 0)
return FALSE;
pos = 0;
}
else if (focus_child == NULL)
{
/* Focus was outside the list, just grab the old focus item
* while keeping the selection intact.
*/
old = GTK_INVALID_LIST_POSITION;
}
else
{
switch (direction)
{
case GTK_DIR_TAB_FORWARD:
pos++;
if (pos >= n_items)
return FALSE;
break;
case GTK_DIR_TAB_BACKWARD:
if (pos == 0)
return FALSE;
pos--;
break;
case GTK_DIR_UP:
pos = gtk_list_base_move_focus (self, pos, GTK_ORIENTATION_VERTICAL, -1);
break;
case GTK_DIR_DOWN:
pos = gtk_list_base_move_focus (self, pos, GTK_ORIENTATION_VERTICAL, 1);
break;
case GTK_DIR_LEFT:
pos = gtk_list_base_move_focus (self, pos, GTK_ORIENTATION_HORIZONTAL, -1);
break;
case GTK_DIR_RIGHT:
pos = gtk_list_base_move_focus (self, pos, GTK_ORIENTATION_HORIZONTAL, 1);
break;
default:
g_assert_not_reached ();
return TRUE;
}
}
if (old == pos)
return TRUE;
item = gtk_list_item_manager_get_nth (priv->item_manager, pos, NULL);
if (item == NULL)
return FALSE;
/* This shouldn't really happen, but if it does, oh well */
if (item->widget == NULL)
return gtk_list_base_grab_focus_on_item (GTK_LIST_BASE (self), pos, TRUE, FALSE, FALSE);
return gtk_widget_child_focus (item->widget, direction);
}
static void
gtk_list_base_dispose (GObject *object)
{
GtkListBase *self = GTK_LIST_BASE (object);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
gtk_list_base_clear_adjustment (self, GTK_ORIENTATION_HORIZONTAL);
gtk_list_base_clear_adjustment (self, GTK_ORIENTATION_VERTICAL);
if (priv->anchor)
{
gtk_list_item_tracker_free (priv->item_manager, priv->anchor);
priv->anchor = NULL;
}
if (priv->selected)
{
gtk_list_item_tracker_free (priv->item_manager, priv->selected);
priv->selected = NULL;
}
if (priv->focus)
{
gtk_list_item_tracker_free (priv->item_manager, priv->focus);
priv->focus = NULL;
}
g_clear_object (&priv->item_manager);
g_clear_object (&priv->model);
G_OBJECT_CLASS (gtk_list_base_parent_class)->dispose (object);
}
static void
gtk_list_base_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GtkListBase *self = GTK_LIST_BASE (object);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
switch (property_id)
{
case PROP_HADJUSTMENT:
g_value_set_object (value, priv->adjustment[GTK_ORIENTATION_HORIZONTAL]);
break;
case PROP_HSCROLL_POLICY:
g_value_set_enum (value, priv->scroll_policy[GTK_ORIENTATION_HORIZONTAL]);
break;
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
case PROP_VADJUSTMENT:
g_value_set_object (value, priv->adjustment[GTK_ORIENTATION_VERTICAL]);
break;
case PROP_VSCROLL_POLICY:
g_value_set_enum (value, priv->scroll_policy[GTK_ORIENTATION_VERTICAL]);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_list_base_set_adjustment (GtkListBase *self,
GtkOrientation orientation,
GtkAdjustment *adjustment)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (priv->adjustment[orientation] == adjustment)
return;
if (adjustment == NULL)
adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
g_object_ref_sink (adjustment);
gtk_list_base_clear_adjustment (self, orientation);
priv->adjustment[orientation] = adjustment;
g_signal_connect (adjustment, "value-changed",
G_CALLBACK (gtk_list_base_adjustment_value_changed_cb),
self);
gtk_widget_queue_allocate (GTK_WIDGET (self));
}
static void
gtk_list_base_set_scroll_policy (GtkListBase *self,
GtkOrientation orientation,
GtkScrollablePolicy scroll_policy)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (priv->scroll_policy[orientation] == scroll_policy)
return;
priv->scroll_policy[orientation] = scroll_policy;
gtk_widget_queue_resize (GTK_WIDGET (self));
g_object_notify_by_pspec (G_OBJECT (self),
orientation == GTK_ORIENTATION_HORIZONTAL
? properties[PROP_HSCROLL_POLICY]
: properties[PROP_VSCROLL_POLICY]);
}
static void
gtk_list_base_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GtkListBase *self = GTK_LIST_BASE (object);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
switch (property_id)
{
case PROP_HADJUSTMENT:
gtk_list_base_set_adjustment (self, GTK_ORIENTATION_HORIZONTAL, g_value_get_object (value));
break;
case PROP_HSCROLL_POLICY:
gtk_list_base_set_scroll_policy (self, GTK_ORIENTATION_HORIZONTAL, g_value_get_enum (value));
break;
case PROP_ORIENTATION:
{
GtkOrientation orientation = g_value_get_enum (value);
if (priv->orientation != orientation)
{
priv->orientation = orientation;
gtk_widget_update_orientation (GTK_WIDGET (self), priv->orientation);
gtk_widget_queue_resize (GTK_WIDGET (self));
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ORIENTATION]);
}
}
break;
case PROP_VADJUSTMENT:
gtk_list_base_set_adjustment (self, GTK_ORIENTATION_VERTICAL, g_value_get_object (value));
break;
case PROP_VSCROLL_POLICY:
gtk_list_base_set_scroll_policy (self, GTK_ORIENTATION_VERTICAL, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_list_base_compute_scroll_align (GtkListBase *self,
GtkOrientation orientation,
int cell_start,
int cell_end,
double current_align,
GtkPackType current_side,
double *new_align,
GtkPackType *new_side)
{
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_side = GTK_PACK_START;
}
else if (cell_end > visible_end)
{
*new_align = 1.0;
*new_side = GTK_PACK_END;
}
else
{
/* XXX: start or end here? */
*new_side = GTK_PACK_START;
*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_side = GTK_PACK_START;
}
else if (cell_end < visible_end)
{
*new_align = 1.0;
*new_side = GTK_PACK_END;
}
else
{
/* the cell already covers the whole screen */
*new_align = current_align;
*new_side = current_side;
}
}
}
static void
gtk_list_base_update_focus_tracker (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkWidget *focus_child;
guint pos;
focus_child = gtk_widget_get_focus_child (GTK_WIDGET (self));
if (!GTK_IS_LIST_ITEM_WIDGET (focus_child))
return;
pos = gtk_list_item_widget_get_position (GTK_LIST_ITEM_WIDGET (focus_child));
if (pos != gtk_list_item_tracker_get_position (priv->item_manager, priv->focus))
{
gtk_list_item_tracker_set_position (priv->item_manager,
priv->focus,
pos,
0,
0);
}
}
static void
gtk_list_base_scroll_to_item (GtkWidget *widget,
const char *action_name,
GVariant *parameter)
{
GtkListBase *self = GTK_LIST_BASE (widget);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
int start, end;
double align_along, align_across;
GtkPackType side_along, side_across;
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_list_base_compute_scroll_align (self,
gtk_list_base_get_orientation (GTK_LIST_BASE (self)),
start, end,
priv->anchor_align_along, priv->anchor_side_along,
&align_along, &side_along);
/* now do the same thing with the other orientation */
if (!gtk_list_base_get_allocation_across (GTK_LIST_BASE (self), pos, &start, &end))
return;
end += start;
gtk_list_base_compute_scroll_align (self,
gtk_list_base_get_opposite_orientation (GTK_LIST_BASE (self)),
start, end,
priv->anchor_align_across, priv->anchor_side_across,
&align_across, &side_across);
gtk_list_base_set_anchor (self,
pos,
align_across, side_across,
align_along, side_along);
/* 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_list_base_update_focus_tracker (self);
}
static void
gtk_list_base_select_item_action (GtkWidget *widget,
const char *action_name,
GVariant *parameter)
{
GtkListBase *self = GTK_LIST_BASE (widget);
guint pos;
gboolean modify, extend;
g_variant_get (parameter, "(ubb)", &pos, &modify, &extend);
gtk_list_base_select_item (self, pos, modify, extend);
}
static void
gtk_list_base_select_all (GtkWidget *widget,
const char *action_name,
GVariant *parameter)
{
GtkListBase *self = GTK_LIST_BASE (widget);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkSelectionModel *selection_model;
selection_model = gtk_list_item_manager_get_model (priv->item_manager);
if (selection_model == NULL)
return;
gtk_selection_model_select_all (selection_model);
}
static void
gtk_list_base_unselect_all (GtkWidget *widget,
const char *action_name,
GVariant *parameter)
{
GtkListBase *self = GTK_LIST_BASE (widget);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkSelectionModel *selection_model;
selection_model = gtk_list_item_manager_get_model (priv->item_manager);
if (selection_model == NULL)
return;
gtk_selection_model_unselect_all (selection_model);
}
static gboolean
gtk_list_base_move_cursor_to_start (GtkWidget *widget,
GVariant *args,
gpointer unused)
{
GtkListBase *self = GTK_LIST_BASE (widget);
gboolean select, modify, extend;
if (gtk_list_base_get_n_items (self) == 0)
return TRUE;
g_variant_get (args, "(bbb)", &select, &modify, &extend);
gtk_list_base_grab_focus_on_item (GTK_LIST_BASE (self), 0, select, modify, extend);
return TRUE;
}
static gboolean
gtk_list_base_move_cursor_page_up (GtkWidget *widget,
GVariant *args,
gpointer unused)
{
GtkListBase *self = GTK_LIST_BASE (widget);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
gboolean select, modify, extend;
cairo_rectangle_int_t area, new_area;
int page_size;
guint pos, new_pos;
pos = gtk_list_base_get_focus_position (self);
page_size = gtk_adjustment_get_page_size (priv->adjustment[priv->orientation]);
if (!gtk_list_base_get_allocation_along (self, pos, &area.y, &area.height) ||
!gtk_list_base_get_allocation_across (self, pos, &area.x, &area.width))
return TRUE;
if (!gtk_list_base_get_position_from_allocation (self,
area.x + area.width / 2,
MAX (0, area.y + area.height - page_size),
&new_pos,
&new_area))
return TRUE;
/* We want the whole row to be visible */
if (new_area.y < MAX (0, area.y + area.height - page_size))
new_pos = gtk_list_base_move_focus_along (self, new_pos, 1);
/* But we definitely want to move if we can */
if (new_pos >= pos)
{
new_pos = gtk_list_base_move_focus_along (self, new_pos, -1);
if (new_pos == pos)
return TRUE;
}
g_variant_get (args, "(bbb)", &select, &modify, &extend);
gtk_list_base_grab_focus_on_item (GTK_LIST_BASE (self), new_pos, select, modify, extend);
return TRUE;
}
static gboolean
gtk_list_base_move_cursor_page_down (GtkWidget *widget,
GVariant *args,
gpointer unused)
{
GtkListBase *self = GTK_LIST_BASE (widget);
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
gboolean select, modify, extend;
cairo_rectangle_int_t area, new_area;
int page_size, end;
guint pos, new_pos;
pos = gtk_list_base_get_focus_position (self);
page_size = gtk_adjustment_get_page_size (priv->adjustment[priv->orientation]);
end = gtk_adjustment_get_upper (priv->adjustment[priv->orientation]);
if (end == 0)
return TRUE;
if (!gtk_list_base_get_allocation_along (self, pos, &area.y, &area.height) ||
!gtk_list_base_get_allocation_across (self, pos, &area.x, &area.width))
return TRUE;
if (!gtk_list_base_get_position_from_allocation (self,
area.x + area.width / 2,
MIN (end, area.y + page_size) - 1,
&new_pos,
&new_area))
return TRUE;
/* We want the whole row to be visible */
if (new_area.y + new_area.height > MIN (end, area.y + page_size))
new_pos = gtk_list_base_move_focus_along (self, new_pos, -1);
/* But we definitely want to move if we can */
if (new_pos <= pos)
{
new_pos = gtk_list_base_move_focus_along (self, new_pos, 1);
if (new_pos == pos)
return TRUE;
}
g_variant_get (args, "(bbb)", &select, &modify, &extend);
gtk_list_base_grab_focus_on_item (GTK_LIST_BASE (self), new_pos, select, modify, extend);
return TRUE;
}
static gboolean
gtk_list_base_move_cursor_to_end (GtkWidget *widget,
GVariant *args,
gpointer unused)
{
GtkListBase *self = GTK_LIST_BASE (widget);
gboolean select, modify, extend;
guint n_items;
n_items = gtk_list_base_get_n_items (self);
if (n_items == 0)
return TRUE;
g_variant_get (args, "(bbb)", &select, &modify, &extend);
gtk_list_base_grab_focus_on_item (GTK_LIST_BASE (self), n_items - 1, select, modify, extend);
return TRUE;
}
static gboolean
gtk_list_base_move_cursor (GtkWidget *widget,
GVariant *args,
gpointer unused)
{
GtkListBase *self = GTK_LIST_BASE (widget);
int amount;
guint orientation;
guint pos;
gboolean select, modify, extend;
g_variant_get (args, "(ubbbi)", &orientation, &select, &modify, &extend, &amount);
pos = gtk_list_base_get_focus_position (self);
pos = gtk_list_base_move_focus (self, pos, orientation, amount);
gtk_list_base_grab_focus_on_item (GTK_LIST_BASE (self), pos, select, modify, extend);
return TRUE;
}
static void
gtk_list_base_add_move_binding (GtkWidgetClass *widget_class,
guint keyval,
GtkOrientation orientation,
int amount)
{
gtk_widget_class_add_binding (widget_class,
keyval,
0,
gtk_list_base_move_cursor,
"(ubbbi)", orientation, TRUE, FALSE, FALSE, amount);
gtk_widget_class_add_binding (widget_class,
keyval,
GDK_CONTROL_MASK,
gtk_list_base_move_cursor,
"(ubbbi)", orientation, FALSE, FALSE, FALSE, amount);
gtk_widget_class_add_binding (widget_class,
keyval,
GDK_SHIFT_MASK,
gtk_list_base_move_cursor,
"(ubbbi)", orientation, TRUE, FALSE, TRUE, amount);
gtk_widget_class_add_binding (widget_class,
keyval,
GDK_CONTROL_MASK | GDK_SHIFT_MASK,
gtk_list_base_move_cursor,
"(ubbbi)", orientation, TRUE, TRUE, TRUE, amount);
}
static void
gtk_list_base_add_custom_move_binding (GtkWidgetClass *widget_class,
guint keyval,
GtkShortcutFunc callback)
{
gtk_widget_class_add_binding (widget_class,
keyval,
0,
callback,
"(bbb)", TRUE, FALSE, FALSE);
gtk_widget_class_add_binding (widget_class,
keyval,
GDK_CONTROL_MASK,
callback,
"(bbb)", FALSE, FALSE, FALSE);
gtk_widget_class_add_binding (widget_class,
keyval,
GDK_SHIFT_MASK,
callback,
"(bbb)", TRUE, FALSE, TRUE);
gtk_widget_class_add_binding (widget_class,
keyval,
GDK_CONTROL_MASK | GDK_SHIFT_MASK,
callback,
"(bbb)", TRUE, TRUE, TRUE);
}
static void
gtk_list_base_class_init (GtkListBaseClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gpointer iface;
widget_class->focus = gtk_list_base_focus;
gobject_class->dispose = gtk_list_base_dispose;
gobject_class->get_property = gtk_list_base_get_property;
gobject_class->set_property = gtk_list_base_set_property;
/* GtkScrollable implementation */
iface = g_type_default_interface_peek (GTK_TYPE_SCROLLABLE);
properties[PROP_HADJUSTMENT] =
g_param_spec_override ("hadjustment",
g_object_interface_find_property (iface, "hadjustment"));
properties[PROP_HSCROLL_POLICY] =
g_param_spec_override ("hscroll-policy",
g_object_interface_find_property (iface, "hscroll-policy"));
properties[PROP_VADJUSTMENT] =
g_param_spec_override ("vadjustment",
g_object_interface_find_property (iface, "vadjustment"));
properties[PROP_VSCROLL_POLICY] =
g_param_spec_override ("vscroll-policy",
g_object_interface_find_property (iface, "vscroll-policy"));
/**
* GtkListBase:orientation:
*
* The orientation of the list. See GtkOrientable:orientation
* for details.
*/
properties[PROP_ORIENTATION] =
g_param_spec_enum ("orientation", NULL, NULL,
GTK_TYPE_ORIENTATION,
GTK_ORIENTATION_VERTICAL,
G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (gobject_class, N_PROPS, properties);
/**
* GtkListBase|list.scroll-to-item:
* @position: position of item to scroll to
*
* Moves the visible area 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_list_base_scroll_to_item);
/**
* GtkListBase|list.select-item:
* @position: position of item to select
* @modify: %TRUE to toggle the existing selection, %FALSE to select
* @extend: %TRUE to extend the selection
*
* Changes selection.
*
* If @extend is %TRUE and the model supports selecting ranges, the
* affected items are all items from the last selected item to the item
* in @position.
* If @extend is %FALSE or selecting ranges is not supported, only the
* item in @position is affected.
*
* If @modify is %TRUE, the affected items will be set to the same state.
* If @modify is %FALSE, the affected items will be selected and
* all other items will be deselected.
*/
gtk_widget_class_install_action (widget_class,
"list.select-item",
"(ubb)",
gtk_list_base_select_item_action);
/**
* GtkListBase|list.select-all:
*
* If the selection model supports it, select all items in the model.
* If not, do nothing.
*/
gtk_widget_class_install_action (widget_class,
"list.select-all",
NULL,
gtk_list_base_select_all);
/**
* GtkListBase|list.unselect-all:
*
* If the selection model supports it, unselect all items in the model.
* If not, do nothing.
*/
gtk_widget_class_install_action (widget_class,
"list.unselect-all",
NULL,
gtk_list_base_unselect_all);
gtk_list_base_add_move_binding (widget_class, GDK_KEY_Up, GTK_ORIENTATION_VERTICAL, -1);
gtk_list_base_add_move_binding (widget_class, GDK_KEY_KP_Up, GTK_ORIENTATION_VERTICAL, -1);
gtk_list_base_add_move_binding (widget_class, GDK_KEY_Down, GTK_ORIENTATION_VERTICAL, 1);
gtk_list_base_add_move_binding (widget_class, GDK_KEY_KP_Down, GTK_ORIENTATION_VERTICAL, 1);
gtk_list_base_add_move_binding (widget_class, GDK_KEY_Left, GTK_ORIENTATION_HORIZONTAL, -1);
gtk_list_base_add_move_binding (widget_class, GDK_KEY_KP_Left, GTK_ORIENTATION_HORIZONTAL, -1);
gtk_list_base_add_move_binding (widget_class, GDK_KEY_Right, GTK_ORIENTATION_HORIZONTAL, 1);
gtk_list_base_add_move_binding (widget_class, GDK_KEY_KP_Right, GTK_ORIENTATION_HORIZONTAL, 1);
gtk_list_base_add_custom_move_binding (widget_class, GDK_KEY_Home, gtk_list_base_move_cursor_to_start);
gtk_list_base_add_custom_move_binding (widget_class, GDK_KEY_KP_Home, gtk_list_base_move_cursor_to_start);
gtk_list_base_add_custom_move_binding (widget_class, GDK_KEY_End, gtk_list_base_move_cursor_to_end);
gtk_list_base_add_custom_move_binding (widget_class, GDK_KEY_KP_End, gtk_list_base_move_cursor_to_end);
gtk_list_base_add_custom_move_binding (widget_class, GDK_KEY_Page_Up, gtk_list_base_move_cursor_page_up);
gtk_list_base_add_custom_move_binding (widget_class, GDK_KEY_KP_Page_Up, gtk_list_base_move_cursor_page_up);
gtk_list_base_add_custom_move_binding (widget_class, GDK_KEY_Page_Down, gtk_list_base_move_cursor_page_down);
gtk_list_base_add_custom_move_binding (widget_class, GDK_KEY_KP_Page_Down, gtk_list_base_move_cursor_page_down);
gtk_widget_class_add_binding_action (widget_class, GDK_KEY_a, GDK_CONTROL_MASK, "list.select-all", NULL);
gtk_widget_class_add_binding_action (widget_class, GDK_KEY_slash, GDK_CONTROL_MASK, "list.select-all", NULL);
gtk_widget_class_add_binding_action (widget_class, GDK_KEY_A, GDK_CONTROL_MASK | GDK_SHIFT_MASK, "list.unselect-all", NULL);
gtk_widget_class_add_binding_action (widget_class, GDK_KEY_backslash, GDK_CONTROL_MASK, "list.unselect-all", NULL);
}
static gboolean
autoscroll_cb (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer data)
{
GtkListBase *self = data;
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
double value;
double delta_x, delta_y;
value = gtk_adjustment_get_value (priv->adjustment[GTK_ORIENTATION_HORIZONTAL]);
gtk_adjustment_set_value (priv->adjustment[GTK_ORIENTATION_HORIZONTAL], value + priv->autoscroll_delta_x);
delta_x = gtk_adjustment_get_value (priv->adjustment[GTK_ORIENTATION_HORIZONTAL]) - value;
value = gtk_adjustment_get_value (priv->adjustment[GTK_ORIENTATION_VERTICAL]);
gtk_adjustment_set_value (priv->adjustment[GTK_ORIENTATION_VERTICAL], value + priv->autoscroll_delta_y);
delta_y = gtk_adjustment_get_value (priv->adjustment[GTK_ORIENTATION_VERTICAL]) - value;
if (delta_x != 0 || delta_y != 0)
{
return G_SOURCE_CONTINUE;
}
else
{
priv->autoscroll_id = 0;
return G_SOURCE_REMOVE;
}
}
static void
add_autoscroll (GtkListBase *self,
double delta_x,
double delta_y)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (gtk_list_base_adjustment_is_flipped (self, GTK_ORIENTATION_HORIZONTAL))
priv->autoscroll_delta_x = -delta_x;
else
priv->autoscroll_delta_x = delta_x;
if (gtk_list_base_adjustment_is_flipped (self, GTK_ORIENTATION_VERTICAL))
priv->autoscroll_delta_y = -delta_y;
else
priv->autoscroll_delta_y = delta_y;
if (priv->autoscroll_id == 0)
priv->autoscroll_id = gtk_widget_add_tick_callback (GTK_WIDGET (self), autoscroll_cb, self, NULL);
}
static void
remove_autoscroll (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (priv->autoscroll_id != 0)
{
gtk_widget_remove_tick_callback (GTK_WIDGET (self), priv->autoscroll_id);
priv->autoscroll_id = 0;
}
}
#define SCROLL_EDGE_SIZE 30
static void
update_autoscroll (GtkListBase *self,
double x,
double y)
{
double width, height;
double delta_x, delta_y;
width = gtk_widget_get_width (GTK_WIDGET (self));
if (x < SCROLL_EDGE_SIZE)
delta_x = - (SCROLL_EDGE_SIZE - x)/3.0;
else if (width - x < SCROLL_EDGE_SIZE)
delta_x = (SCROLL_EDGE_SIZE - (width - x))/3.0;
else
delta_x = 0;
if (gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_RTL)
delta_x = - delta_x;
height = gtk_widget_get_height (GTK_WIDGET (self));
if (y < SCROLL_EDGE_SIZE)
delta_y = - (SCROLL_EDGE_SIZE - y)/3.0;
else if (height - y < SCROLL_EDGE_SIZE)
delta_y = (SCROLL_EDGE_SIZE - (height - y))/3.0;
else
delta_y = 0;
if (delta_x != 0 || delta_y != 0)
add_autoscroll (self, delta_x, delta_y);
else
remove_autoscroll (self);
}
/**
* gtk_list_base_size_allocate_child:
* @self: The listbase
* @child: The child
* @x: top left coordinate in the across direction
* @y: top right coordinate in the along direction
* @width: size in the across direction
* @height: size in the along direction
*
* Allocates a child widget in the list coordinate system,
* but with the coordinates already offset by the scroll
* offset.
**/
void
gtk_list_base_size_allocate_child (GtkListBase *self,
GtkWidget *child,
int x,
int y,
int width,
int height)
{
GtkAllocation child_allocation;
int self_width, self_height;
self_width = gtk_widget_get_width (GTK_WIDGET (self));
self_height = gtk_widget_get_height (GTK_WIDGET (self));
if (gtk_list_base_get_orientation (GTK_LIST_BASE (self)) == GTK_ORIENTATION_VERTICAL)
{
if (_gtk_widget_get_direction (GTK_WIDGET (self)) == GTK_TEXT_DIR_LTR)
{
child_allocation.x = x;
child_allocation.y = y;
}
else
{
child_allocation.x = self_width - x - width;
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;
}
else
{
child_allocation.x = self_width - y - height;
child_allocation.y = x;
}
child_allocation.width = height;
child_allocation.height = width;
}
if (!gdk_rectangle_intersect (&child_allocation,
&(GdkRectangle) {
- GTK_LIST_BASE_CHILD_MAX_OVERDRAW,
- GTK_LIST_BASE_CHILD_MAX_OVERDRAW,
self_width + GTK_LIST_BASE_CHILD_MAX_OVERDRAW,
self_height + GTK_LIST_BASE_CHILD_MAX_OVERDRAW
},
NULL))
{
/* child is fully outside the viewport, hide it and don't allocate it */
gtk_widget_set_child_visible (child, FALSE);
return;
}
gtk_widget_set_child_visible (child, TRUE);
gtk_widget_size_allocate (child, &child_allocation, -1);
}
static void
gtk_list_base_widget_to_list (GtkListBase *self,
double x_widget,
double y_widget,
int *across_out,
int *along_out)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkWidget *widget = GTK_WIDGET (self);
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
x_widget = gtk_widget_get_width (widget) - x_widget;
gtk_list_base_get_adjustment_values (self, OPPOSITE_ORIENTATION (priv->orientation), across_out, NULL, NULL);
gtk_list_base_get_adjustment_values (self, priv->orientation, along_out, NULL, NULL);
if (priv->orientation == GTK_ORIENTATION_VERTICAL)
{
*across_out += x_widget;
*along_out += y_widget;
}
else
{
*across_out += y_widget;
*along_out += x_widget;
}
}
static GtkBitset *
gtk_list_base_get_items_in_rect (GtkListBase *self,
const GdkRectangle *rect)
{
return GTK_LIST_BASE_GET_CLASS (self)->get_items_in_rect (self, rect);
}
static gboolean
gtk_list_base_get_rubberband_coords (GtkListBase *self,
GdkRectangle *rect)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
int x1, x2, y1, y2;
if (!priv->rubberband)
return FALSE;
if (priv->rubberband->start_tracker == NULL)
{
x1 = 0;
y1 = 0;
}
else
{
guint pos = gtk_list_item_tracker_get_position (priv->item_manager, priv->rubberband->start_tracker);
if (gtk_list_base_get_allocation_along (self, pos, &y1, &y2) &&
gtk_list_base_get_allocation_across (self, pos, &x1, &x2))
{
x1 += x2 * priv->rubberband->start_align_across;
y1 += y2 * priv->rubberband->start_align_along;
}
else
{
x1 = 0;
y1 = 0;
}
}
gtk_list_base_widget_to_list (self,
priv->rubberband->pointer_x, priv->rubberband->pointer_y,
&x2, &y2);
rect->x = MIN (x1, x2);
rect->y = MIN (y1, y2);
rect->width = ABS (x1 - x2) + 1;
rect->height = ABS (y1 - y2) + 1;
return TRUE;
}
void
gtk_list_base_allocate_rubberband (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkRequisition min_size;
GdkRectangle rect;
int offset_x, offset_y;
if (!gtk_list_base_get_rubberband_coords (self, &rect))
return;
gtk_widget_get_preferred_size (priv->rubberband->widget, &min_size, NULL);
rect.width = MAX (min_size.width, rect.width);
rect.height = MAX (min_size.height, rect.height);
gtk_list_base_get_adjustment_values (self, OPPOSITE_ORIENTATION (priv->orientation), &offset_x, NULL, NULL);
gtk_list_base_get_adjustment_values (self, priv->orientation, &offset_y, NULL, NULL);
rect.x -= offset_x;
rect.y -= offset_y;
gtk_list_base_size_allocate_child (self,
priv->rubberband->widget,
rect.x, rect.y, rect.width, rect.height);
}
static void
gtk_list_base_start_rubberband (GtkListBase *self,
double x,
double y)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
cairo_rectangle_int_t item_area;
int list_x, list_y;
guint pos;
if (priv->rubberband)
return;
gtk_list_base_widget_to_list (self, x, y, &list_x, &list_y);
if (!gtk_list_base_get_position_from_allocation (self, list_x, list_y, &pos, &item_area))
{
g_warning ("Could not start rubberbanding: No item\n");
return;
}
priv->rubberband = g_new0 (RubberbandData, 1);
priv->rubberband->start_tracker = gtk_list_item_tracker_new (priv->item_manager);
gtk_list_item_tracker_set_position (priv->item_manager, priv->rubberband->start_tracker, pos, 0, 0);
priv->rubberband->start_align_across = (double) (list_x - item_area.x) / item_area.width;
priv->rubberband->start_align_along = (double) (list_y - item_area.y) / item_area.height;
priv->rubberband->pointer_x = x;
priv->rubberband->pointer_y = y;
priv->rubberband->widget = gtk_gizmo_new ("rubberband",
NULL, NULL, NULL, NULL, NULL, NULL);
gtk_widget_set_parent (priv->rubberband->widget, GTK_WIDGET (self));
}
static void
gtk_list_base_stop_rubberband (GtkListBase *self,
gboolean modify,
gboolean extend)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkListItemManagerItem *item;
GtkSelectionModel *model;
if (!priv->rubberband)
return;
for (item = gtk_list_item_manager_get_first (priv->item_manager);
item != NULL;
item = gtk_rb_tree_node_get_next (item))
{
if (item->widget)
gtk_widget_unset_state_flags (item->widget, GTK_STATE_FLAG_ACTIVE);
}
model = gtk_list_item_manager_get_model (priv->item_manager);
if (model != NULL)
{
GtkBitset *selected, *mask;
GdkRectangle rect;
GtkBitset *rubberband_selection;
if (!gtk_list_base_get_rubberband_coords (self, &rect))
return;
rubberband_selection = gtk_list_base_get_items_in_rect (self, &rect);
if (gtk_bitset_is_empty (rubberband_selection))
{
gtk_bitset_unref (rubberband_selection);
return;
}
if (modify && extend) /* Ctrl + Shift */
{
GtkBitset *current;
guint min = gtk_bitset_get_minimum (rubberband_selection);
guint max = gtk_bitset_get_maximum (rubberband_selection);
/* toggle the rubberband, keep the rest */
current = gtk_selection_model_get_selection_in_range (model, min, max - min + 1);
selected = gtk_bitset_copy (current);
gtk_bitset_unref (current);
gtk_bitset_intersect (selected, rubberband_selection);
gtk_bitset_difference (selected, rubberband_selection);
mask = gtk_bitset_ref (rubberband_selection);
}
else if (modify) /* Ctrl */
{
/* select the rubberband, keep the rest */
selected = gtk_bitset_ref (rubberband_selection);
mask = gtk_bitset_ref (rubberband_selection);
}
else if (extend) /* Shift */
{
/* unselect the rubberband, keep the rest */
selected = gtk_bitset_new_empty ();
mask = gtk_bitset_ref (rubberband_selection);
}
else /* no modifier */
{
/* select the rubberband, clear the rest */
selected = gtk_bitset_ref (rubberband_selection);
mask = gtk_bitset_new_empty ();
gtk_bitset_add_range (mask, 0, g_list_model_get_n_items (G_LIST_MODEL (model)));
}
gtk_selection_model_set_selection (model, selected, mask);
gtk_bitset_unref (selected);
gtk_bitset_unref (mask);
gtk_bitset_unref (rubberband_selection);
}
gtk_list_item_tracker_free (priv->item_manager, priv->rubberband->start_tracker);
g_clear_pointer (&priv->rubberband->widget, gtk_widget_unparent);
g_free (priv->rubberband);
priv->rubberband = NULL;
remove_autoscroll (self);
}
static void
gtk_list_base_update_rubberband_selection (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkListItemManagerItem *item;
GdkRectangle rect;
guint pos;
GtkBitset *rubberband_selection;
if (!gtk_list_base_get_rubberband_coords (self, &rect))
return;
rubberband_selection = gtk_list_base_get_items_in_rect (self, &rect);
pos = 0;
for (item = gtk_list_item_manager_get_first (priv->item_manager);
item != NULL;
item = gtk_rb_tree_node_get_next (item))
{
if (item->widget)
{
if (gtk_bitset_contains (rubberband_selection, pos))
gtk_widget_set_state_flags (item->widget, GTK_STATE_FLAG_ACTIVE, FALSE);
else
gtk_widget_unset_state_flags (item->widget, GTK_STATE_FLAG_ACTIVE);
}
pos += item->n_items;
}
gtk_bitset_unref (rubberband_selection);
}
static void
gtk_list_base_update_rubberband (GtkListBase *self,
double x,
double y)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (!priv->rubberband)
return;
priv->rubberband->pointer_x = x;
priv->rubberband->pointer_y = y;
gtk_list_base_update_rubberband_selection (self);
update_autoscroll (self, x, y);
gtk_widget_queue_allocate (GTK_WIDGET (self));
}
static void
get_selection_modifiers (GtkGesture *gesture,
gboolean *modify,
gboolean *extend)
{
GdkEventSequence *sequence;
GdkEvent *event;
GdkModifierType state;
*modify = FALSE;
*extend = FALSE;
sequence = gtk_gesture_get_last_updated_sequence (gesture);
event = gtk_gesture_get_last_event (gesture, sequence);
state = gdk_event_get_modifier_state (event);
if ((state & GDK_CONTROL_MASK) == GDK_CONTROL_MASK)
*modify = TRUE;
if ((state & GDK_SHIFT_MASK) == GDK_SHIFT_MASK)
*extend = TRUE;
}
static void
gtk_list_base_drag_update (GtkGestureDrag *gesture,
double offset_x,
double offset_y,
GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
double start_x, start_y;
gtk_gesture_drag_get_start_point (gesture, &start_x, &start_y);
if (!priv->rubberband)
{
if (!gtk_drag_check_threshold_double (GTK_WIDGET (self), 0, 0, offset_x, offset_y))
return;
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
gtk_list_base_start_rubberband (self, start_x, start_y);
}
gtk_list_base_update_rubberband (self, start_x + offset_x, start_y + offset_y);
}
static void
gtk_list_base_drag_end (GtkGestureDrag *gesture,
double offset_x,
double offset_y,
GtkListBase *self)
{
gboolean modify, extend;
gtk_list_base_drag_update (gesture, offset_x, offset_y, self);
get_selection_modifiers (GTK_GESTURE (gesture), &modify, &extend);
gtk_list_base_stop_rubberband (self, modify, extend);
}
void
gtk_list_base_set_enable_rubberband (GtkListBase *self,
gboolean enable)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (priv->enable_rubberband == enable)
return;
priv->enable_rubberband = enable;
if (enable)
{
priv->drag_gesture = gtk_gesture_drag_new ();
g_signal_connect (priv->drag_gesture, "drag-update", G_CALLBACK (gtk_list_base_drag_update), self);
g_signal_connect (priv->drag_gesture, "drag-end", G_CALLBACK (gtk_list_base_drag_end), self);
gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (priv->drag_gesture));
}
else
{
gtk_widget_remove_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (priv->drag_gesture));
priv->drag_gesture = NULL;
}
}
gboolean
gtk_list_base_get_enable_rubberband (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
return priv->enable_rubberband;
}
static void
gtk_list_base_drag_motion (GtkDropControllerMotion *motion,
double x,
double y,
gpointer unused)
{
GtkWidget *widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (motion));
update_autoscroll (GTK_LIST_BASE (widget), x, y);
}
static void
gtk_list_base_drag_leave (GtkDropControllerMotion *motion,
gpointer unused)
{
GtkWidget *widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (motion));
remove_autoscroll (GTK_LIST_BASE (widget));
}
static void
gtk_list_base_init_real (GtkListBase *self,
GtkListBaseClass *g_class)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkEventController *controller;
priv->item_manager = gtk_list_item_manager_new_for_size (GTK_WIDGET (self),
g_class->list_item_name,
g_class->list_item_role,
g_class->list_item_size,
g_class->list_item_augment_size,
g_class->list_item_augment_func);
priv->anchor = gtk_list_item_tracker_new (priv->item_manager);
priv->anchor_side_along = GTK_PACK_START;
priv->anchor_side_across = GTK_PACK_START;
priv->selected = gtk_list_item_tracker_new (priv->item_manager);
priv->focus = gtk_list_item_tracker_new (priv->item_manager);
priv->adjustment[GTK_ORIENTATION_HORIZONTAL] = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
g_object_ref_sink (priv->adjustment[GTK_ORIENTATION_HORIZONTAL]);
priv->adjustment[GTK_ORIENTATION_VERTICAL] = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
g_object_ref_sink (priv->adjustment[GTK_ORIENTATION_VERTICAL]);
priv->orientation = GTK_ORIENTATION_VERTICAL;
gtk_widget_set_overflow (GTK_WIDGET (self), GTK_OVERFLOW_HIDDEN);
gtk_widget_set_focusable (GTK_WIDGET (self), TRUE);
controller = gtk_drop_controller_motion_new ();
g_signal_connect (controller, "motion", G_CALLBACK (gtk_list_base_drag_motion), NULL);
g_signal_connect (controller, "leave", G_CALLBACK (gtk_list_base_drag_leave), NULL);
gtk_widget_add_controller (GTK_WIDGET (self), controller);
}
static int
gtk_list_base_set_adjustment_values (GtkListBase *self,
GtkOrientation orientation,
int value,
int size,
int page_size)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
size = MAX (size, page_size);
value = MAX (value, 0);
value = MIN (value, size - page_size);
g_signal_handlers_block_by_func (priv->adjustment[orientation],
gtk_list_base_adjustment_value_changed_cb,
self);
gtk_adjustment_configure (priv->adjustment[orientation],
gtk_list_base_adjustment_is_flipped (self, orientation)
? size - page_size - value
: value,
0,
size,
page_size * 0.1,
page_size * 0.9,
page_size);
g_signal_handlers_unblock_by_func (priv->adjustment[orientation],
gtk_list_base_adjustment_value_changed_cb,
self);
return value;
}
void
gtk_list_base_update_adjustments (GtkListBase *self,
int total_across,
int total_along,
int page_across,
int page_along,
int *across,
int *along)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
int value_along, value_across, size;
guint pos;
pos = gtk_list_item_tracker_get_position (priv->item_manager, priv->anchor);
if (pos == GTK_INVALID_LIST_POSITION)
{
value_across = 0;
value_along = 0;
}
else
{
if (gtk_list_base_get_allocation_across (self, pos, &value_across, &size))
{
if (priv->anchor_side_across == GTK_PACK_END)
value_across += size;
value_across -= priv->anchor_align_across * page_across;
}
else
{
value_along = 0;
}
if (gtk_list_base_get_allocation_along (self, pos, &value_along, &size))
{
if (priv->anchor_side_along == GTK_PACK_END)
value_along += size;
value_along -= priv->anchor_align_along * page_along;
}
else
{
value_along = 0;
}
}
*across = gtk_list_base_set_adjustment_values (self,
OPPOSITE_ORIENTATION (priv->orientation),
value_across,
total_across,
page_across);
*along = gtk_list_base_set_adjustment_values (self,
priv->orientation,
value_along,
total_along,
page_along);
}
GtkScrollablePolicy
gtk_list_base_get_scroll_policy (GtkListBase *self,
GtkOrientation orientation)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
return priv->scroll_policy[orientation];
}
GtkOrientation
gtk_list_base_get_orientation (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
return priv->orientation;
}
GtkListItemManager *
gtk_list_base_get_manager (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
return priv->item_manager;
}
guint
gtk_list_base_get_anchor (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
return gtk_list_item_tracker_get_position (priv->item_manager,
priv->anchor);
}
/*
* gtk_list_base_set_anchor:
* @self: a `GtkListBase`
* @anchor_pos: position of the item to anchor
* @anchor_align_across: how far in the across direction to anchor
* @anchor_side_across: if the anchor should side to start or end of item
* @anchor_align_along: how far in the along direction to anchor
* @anchor_side_along: if the anchor should side to start or end of item
*
* Sets the anchor.
* The anchor is the item that is always kept on screen.
*
* In each dimension, anchoring uses 2 variables: The side of the
* item that gets anchored - either start or end - and where in
* the widget's allocation it should get anchored - here 0.0 means
* the start of the widget and 1.0 is the end of the widget.
* It is allowed to use values outside of this range. In particular,
* this is necessary when the items are larger than the list's
* allocation.
*
* Using this information, the adjustment's value and in turn widget
* offsets will then be computed. If the anchor is too far off, it
* will be clamped so that there are always visible items on screen.
*
* Making anchoring this complicated ensures that one item - one
* corner of one item to be exact - always stays at the same place
* (usually this item is the focused item). So when the list undergoes
* heavy changes (like sorting, filtering, removals, additions), this
* item will stay in place while everything around it will shuffle
* around.
*
* The anchor will also ensure that enough widgets are created according
* to gtk_list_base_set_anchor_max_widgets().
**/
void
gtk_list_base_set_anchor (GtkListBase *self,
guint anchor_pos,
double anchor_align_across,
GtkPackType anchor_side_across,
double anchor_align_along,
GtkPackType anchor_side_along)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
guint items_before;
items_before = round (priv->center_widgets * CLAMP (anchor_align_along, 0, 1));
gtk_list_item_tracker_set_position (priv->item_manager,
priv->anchor,
anchor_pos,
items_before + priv->above_below_widgets,
priv->center_widgets - items_before + priv->above_below_widgets);
priv->anchor_align_across = anchor_align_across;
priv->anchor_side_across = anchor_side_across;
priv->anchor_align_along = anchor_align_along;
priv->anchor_side_along = anchor_side_along;
gtk_widget_queue_allocate (GTK_WIDGET (self));
}
/**
* gtk_list_base_set_anchor_max_widgets:
* @self: a `GtkListBase`
* @center: the number of widgets in the middle
* @above_below: extra widgets above and below
*
* Sets how many widgets should be kept alive around the anchor.
* The number of these widgets determines how many items can be
* displayed and must be chosen to be large enough to cover the
* allocation but should be kept as small as possible for
* performance reasons.
*
* There will be @center widgets allocated around the anchor
* evenly distributed according to the anchor's alignment - if
* the anchor is at the start, all these widgets will be allocated
* behind it, if it's at the end, all the widgets will be allocated
* in front of it.
*
* Addditionally, there will be @above_below widgets allocated both
* before and after the sencter widgets, so the total number of
* widgets kept alive is 2 * above_below + center + 1.
**/
void
gtk_list_base_set_anchor_max_widgets (GtkListBase *self,
guint n_center,
guint n_above_below)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
priv->center_widgets = n_center;
priv->above_below_widgets = n_above_below;
gtk_list_base_set_anchor (self,
gtk_list_item_tracker_get_position (priv->item_manager, priv->anchor),
priv->anchor_align_across,
priv->anchor_side_across,
priv->anchor_align_along,
priv->anchor_side_along);
}
/*
* gtk_list_base_grab_focus_on_item:
* @self: a `GtkListBase`
* @pos: position of the item to focus
* @select: %TRUE to select the item
* @modify: if selecting, %TRUE to modify the selected
* state, %FALSE to always select
* @extend: if selecting, %TRUE to extend the selection,
* %FALSE to only operate on this item
*
* Tries to grab focus on the given item. If there is no item
* at this position or grabbing focus failed, %FALSE will be
* returned.
*
* Returns: %TRUE if focusing the item succeeded
**/
gboolean
gtk_list_base_grab_focus_on_item (GtkListBase *self,
guint pos,
gboolean select,
gboolean modify,
gboolean extend)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
GtkListItemManagerItem *item;
gboolean success;
item = gtk_list_item_manager_get_nth (priv->item_manager, pos, NULL);
if (item == NULL)
return FALSE;
if (!item->widget)
{
GtkListItemTracker *tracker = gtk_list_item_tracker_new (priv->item_manager);
/* We need a tracker here to create the widget.
* That needs to have happened or we can't grab it.
* And we can't use a different tracker, because they manage important rows,
* so we create a temporary one. */
gtk_list_item_tracker_set_position (priv->item_manager, tracker, pos, 0, 0);
item = gtk_list_item_manager_get_nth (priv->item_manager, pos, NULL);
g_assert (item->widget);
success = gtk_widget_grab_focus (item->widget);
gtk_list_item_tracker_free (priv->item_manager, tracker);
}
else
{
success = gtk_widget_grab_focus (item->widget);
}
if (!success)
return FALSE;
if (select)
gtk_list_base_select_item (self, pos, modify, extend);
return TRUE;
}
GtkSelectionModel *
gtk_list_base_get_model (GtkListBase *self)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
return priv->model;
}
gboolean
gtk_list_base_set_model (GtkListBase *self,
GtkSelectionModel *model)
{
GtkListBasePrivate *priv = gtk_list_base_get_instance_private (self);
if (priv->model == model)
return FALSE;
g_clear_object (&priv->model);
if (model)
{
priv->model = g_object_ref (model);
gtk_list_item_manager_set_model (priv->item_manager, model);
gtk_list_base_set_anchor (self, 0, 0.0, GTK_PACK_START, 0.0, GTK_PACK_START);
}
else
{
gtk_list_item_manager_set_model (priv->item_manager, NULL);
}
return TRUE;
}
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