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Improve scrolling

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Arrange for autoscroll and keyboard scrolling to end on a
tab boundary.
This commit is contained in:
Matthias Clasen
2016-05-26 00:18:06 -04:00
parent 9f1fc47175
commit 2c944b7928
1 changed files with 134 additions and 37 deletions
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171
gtk/gtktabstrip.c
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@@ -36,7 +36,6 @@
* TODO:
* - reordering
* - dnd
* - improve scrolling: scroll by tabs for click/activation
*/
typedef struct
@@ -53,6 +52,8 @@ typedef struct
GtkWidget *end_scroll;
GtkScrollType autoscroll_mode;
guint autoscroll_id;
gboolean autoscroll_goal_set;
gdouble autoscroll_goal;
} GtkTabStripPrivate;
G_DEFINE_TYPE_WITH_PRIVATE (GtkTabStrip, gtk_tab_strip, GTK_TYPE_CONTAINER)
@@ -411,6 +412,17 @@ update_scrolling (GtkTabStrip *self)
hscroll, vscroll);
}
static GtkAdjustment *
gtk_tab_strip_get_scroll_adjustment (GtkTabStrip *self)
{
GtkTabStripPrivate *priv = gtk_tab_strip_get_instance_private (self);
if (gtk_tab_strip_get_orientation (self) == GTK_ORIENTATION_HORIZONTAL)
return gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (priv->scrolledwindow));
else
return gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (priv->scrolledwindow));
}
static gboolean
autoscroll_cb (GtkWidget *widget,
GdkFrameClock *frame_clock,
@@ -421,20 +433,41 @@ autoscroll_cb (GtkWidget *widget,
GtkAdjustment *adj;
gdouble value;
if (gtk_tab_strip_get_orientation (self) == GTK_ORIENTATION_HORIZONTAL)
adj = gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (priv->scrolledwindow));
else
adj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (priv->scrolledwindow));
adj = gtk_tab_strip_get_scroll_adjustment (self);
value = gtk_adjustment_get_value (adj);
if (priv->autoscroll_mode == GTK_SCROLL_STEP_FORWARD)
if (priv->autoscroll_goal_set && ABS (value - priv->autoscroll_goal) < 5)
value = priv->autoscroll_goal;
else if (priv->autoscroll_mode == GTK_SCROLL_STEP_FORWARD)
value += 5;
else
value -= 5;
gtk_adjustment_set_value (adj, value);
return G_SOURCE_CONTINUE;
if (priv->autoscroll_goal_set && value == priv->autoscroll_goal)
{
priv->autoscroll_id = 0;
return G_SOURCE_REMOVE;
}
else
{
return G_SOURCE_CONTINUE;
}
}
static GtkScrollType
autoscroll_mode_for_button (GtkTabStrip *self,
GtkWidget *button)
{
GtkTabStripPrivate *priv = gtk_tab_strip_get_instance_private (self);
if ((button == priv->start_scroll && !priv->reversed) ||
(button == priv->end_scroll && priv->reversed))
return GTK_SCROLL_STEP_BACKWARD;
else
return GTK_SCROLL_STEP_FORWARD;
}
static void
@@ -446,12 +479,8 @@ add_autoscroll (GtkTabStrip *self,
if (priv->autoscroll_id != 0)
return;
if ((button == priv->start_scroll && !priv->reversed) ||
(button == priv->end_scroll && priv->reversed))
priv->autoscroll_mode = GTK_SCROLL_STEP_BACKWARD;
else
priv->autoscroll_mode = GTK_SCROLL_STEP_FORWARD;
priv->autoscroll_mode = autoscroll_mode_for_button (self, button);
priv->autoscroll_goal_set = FALSE;
priv->autoscroll_id = gtk_widget_add_tick_callback (GTK_WIDGET (self),
autoscroll_cb, self, NULL);
}
@@ -461,11 +490,87 @@ remove_autoscroll (GtkTabStrip *self)
{
GtkTabStripPrivate *priv = gtk_tab_strip_get_instance_private (self);
if (priv->autoscroll_id)
if (priv->autoscroll_id == 0)
return;
gtk_widget_remove_tick_callback (GTK_WIDGET (self), priv->autoscroll_id);
priv->autoscroll_id = 0;
}
static gdouble
find_autoscroll_goal (GtkTabStrip *self,
gboolean force_step,
GtkScrollType mode)
{
GtkTabStripPrivate *priv = gtk_tab_strip_get_instance_private (self);
GtkAdjustment *adj;
gdouble value;
gdouble goal;
GList *children, *l;
adj = gtk_tab_strip_get_scroll_adjustment (self);
if (mode == GTK_SCROLL_STEP_FORWARD)
value = gtk_adjustment_get_value (adj) + gtk_adjustment_get_page_size (adj);
else
value = gtk_adjustment_get_value (adj);
if (force_step)
{
gtk_widget_remove_tick_callback (GTK_WIDGET (self), priv->autoscroll_id);
priv->autoscroll_id = 0;
if (mode == GTK_SCROLL_STEP_FORWARD)
value += 5;
else
value -= 5;
value = CLAMP (value, gtk_adjustment_get_lower (adj), gtk_adjustment_get_upper (adj));
}
goal = 0;
children = gtk_container_get_children (GTK_CONTAINER (priv->tabs));
for (l = children; l; l = l->next)
{
GtkWidget *child = l->data;
GtkAllocation alloc;
gint start, end;
gtk_widget_get_allocation (child, &alloc);
if (gtk_tab_strip_get_orientation (self) == GTK_ORIENTATION_HORIZONTAL)
{
start = alloc.x;
end = alloc.x + alloc.width;
}
else
{
start = alloc.y;
end = alloc.y + alloc.height;
}
if (start <= value && value <= end)
{
if (mode == GTK_SCROLL_STEP_FORWARD)
goal = end - gtk_adjustment_get_page_size (adj);
else
goal = start;
break;
}
}
g_list_free (children);
return goal;
}
static void
finish_autoscroll (GtkTabStrip *self)
{
GtkTabStripPrivate *priv = gtk_tab_strip_get_instance_private (self);
gdouble goal;
if (priv->autoscroll_id == 0 || priv->autoscroll_goal_set)
return;
goal = find_autoscroll_goal (self, FALSE, priv->autoscroll_mode);
priv->autoscroll_goal = goal;
priv->autoscroll_goal_set = TRUE;
}
static gboolean
@@ -473,10 +578,13 @@ scroll_button_event (GtkWidget *button,
GdkEventButton *event,
GtkTabStrip *self)
{
remove_autoscroll (self);
if (event->type == GDK_BUTTON_PRESS)
add_autoscroll (self, button);
{
remove_autoscroll (self);
add_autoscroll (self, button);
}
else if (event->type == GDK_BUTTON_RELEASE)
finish_autoscroll (self);
return FALSE;
}
@@ -485,22 +593,15 @@ static void
scroll_button_activate (GtkWidget *button,
GtkTabStrip *self)
{
GtkTabStripPrivate *priv = gtk_tab_strip_get_instance_private (self);
GtkAdjustment *adj;
gdouble value;
gdouble goal;
GtkScrollType mode;
if (gtk_tab_strip_get_orientation (self) == GTK_ORIENTATION_HORIZONTAL)
adj = gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (priv->scrolledwindow));
else
adj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (priv->scrolledwindow));
value = gtk_adjustment_get_value (adj);
mode = autoscroll_mode_for_button (self, button);
goal = find_autoscroll_goal (self, TRUE, mode);
if (priv->start_scroll == button)
value -= 20;
else
value += 20;
gtk_adjustment_animate_to_value (adj, value);
adj = gtk_tab_strip_get_scroll_adjustment (self);
gtk_adjustment_animate_to_value (adj, goal);
}
static void
@@ -511,11 +612,7 @@ adjustment_changed (GtkTabStrip *self)
gdouble value;
gboolean at_lower, at_upper;
if (gtk_tab_strip_get_orientation (self) == GTK_ORIENTATION_HORIZONTAL)
adj = gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (priv->scrolledwindow));
else
adj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (priv->scrolledwindow));
adj = gtk_tab_strip_get_scroll_adjustment (self);
value = gtk_adjustment_get_value (adj);
at_lower = value <= gtk_adjustment_get_lower (adj);