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GtkScrolledWindow: Allow scrolling without bars

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Add a new policy, GTK_POLICY_EXTERNAL, which hides the scrollbar,
but does not force the scrolled windows size to be determined by
its child. This can be used to keep two scrolled windows in sync,
while sharing a single scrollbar.

https://bugzilla.gnome.org/show_bug.cgi?id=730730
This commit is contained in:
Matthias Clasen 2014-10-04 23:15:04 -04:00
parent 3f4bd447f8
commit 94b680c2cd
2 changed files with 63 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

95
gtk/gtkscrolledwindow.c
View File

@ -569,6 +569,22 @@ gtk_scrolled_window_class_init (GtkScrolledWindowClass *class)
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SCROLLED_WINDOW_ACCESSIBLE);
}
static gboolean
may_hscroll (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
return priv->hscrollbar_visible || priv->hscrollbar_policy == GTK_POLICY_EXTERNAL;
}
static gboolean
may_vscroll (GtkScrolledWindow *scrolled_window)
{
GtkScrolledWindowPrivate *priv = scrolled_window->priv;
return priv->vscrollbar_visible || priv->vscrollbar_policy == GTK_POLICY_EXTERNAL;
}
static void
scrolled_window_drag_begin_cb (GtkScrolledWindow *scrolled_window,
gdouble start_x,
@ -589,9 +605,8 @@ scrolled_window_drag_begin_cb (GtkScrolledWindow *scrolled_window,
event = gtk_gesture_get_last_event (gesture, sequence);
event_widget = gtk_get_event_widget ((GdkEvent *) event);
if (event_widget == priv->vscrollbar ||
event_widget == priv->hscrollbar ||
(!priv->hscrollbar_visible && !priv->vscrollbar_visible))
if (event_widget == priv->vscrollbar || event_widget == priv->hscrollbar ||
(!may_hscroll (scrolled_window) && !may_vscroll (scrolled_window)))
state = GTK_EVENT_SEQUENCE_DENIED;
else if (priv->capture_button_press)
state = GTK_EVENT_SEQUENCE_CLAIMED;
@ -671,7 +686,7 @@ scrolled_window_drag_update_cb (GtkScrolledWindow *scrolled_window,
}
hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
if (hadjustment && priv->hscrollbar_visible)
if (hadjustment && may_hscroll (scrolled_window))
{
dx = priv->drag_start_x - offset_x;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, hadjustment,
@ -679,7 +694,7 @@ scrolled_window_drag_update_cb (GtkScrolledWindow *scrolled_window,
}
vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar));
if (vadjustment && priv->vscrollbar_visible)
if (vadjustment && may_vscroll (scrolled_window))
{
dy = priv->drag_start_y - offset_y;
_gtk_scrolled_window_set_adjustment_value (scrolled_window, vadjustment,
@ -712,10 +727,10 @@ scrolled_window_swipe_cb (GtkScrolledWindow *scrolled_window,
priv->x_velocity = -x_velocity;
priv->y_velocity = -y_velocity;
/* Zero out vector components without a visible scrollbar */
if (!priv->hscrollbar_visible)
/* Zero out vector components for which we don't scroll */
if (!may_hscroll (scrolled_window))
priv->x_velocity = 0;
if (!priv->vscrollbar_visible)
if (!may_vscroll (scrolled_window))
priv->y_velocity = 0;
if (priv->x_velocity != 0 || priv->y_velocity != 0 || overshoot)
@ -765,12 +780,12 @@ gtk_scrolled_window_check_attach_pan_gesture (GtkScrolledWindow *sw)
GtkScrolledWindowPrivate *priv = sw->priv;
if (priv->kinetic_scrolling &&
((priv->hscrollbar_visible && !priv->vscrollbar_visible) ||
(!priv->hscrollbar_visible && priv->vscrollbar_visible)))
((may_hscroll (sw) && !may_vscroll (sw)) ||
(!may_hscroll (sw) && may_vscroll (sw))))
{
GtkOrientation orientation;
if (priv->hscrollbar_visible)
if (may_hscroll (sw))
orientation = GTK_ORIENTATION_HORIZONTAL;
else
orientation = GTK_ORIENTATION_VERTICAL;
@ -1697,7 +1712,7 @@ gtk_scrolled_window_draw (GtkWidget *widget,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
if (priv->hscrollbar_visible &&
if (priv->hscrollbar_visible &&
priv->vscrollbar_visible)
gtk_scrolled_window_draw_scrollbars_junction (scrolled_window, cr);
@ -1817,10 +1832,6 @@ gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window,
return FALSE;
}
if ((horizontal && !priv->hscrollbar_visible) ||
(!horizontal && !priv->vscrollbar_visible))
return FALSE;
if (horizontal)
adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar));
else
@ -2075,11 +2086,14 @@ gtk_scrolled_window_size_allocate (GtkWidget *widget,
if (priv->hscrollbar_policy == GTK_POLICY_ALWAYS)
priv->hscrollbar_visible = TRUE;
else if (priv->hscrollbar_policy == GTK_POLICY_NEVER)
else if (priv->hscrollbar_policy == GTK_POLICY_NEVER ||
priv->hscrollbar_policy == GTK_POLICY_EXTERNAL)
priv->hscrollbar_visible = FALSE;
if (priv->vscrollbar_policy == GTK_POLICY_ALWAYS)
priv->vscrollbar_visible = TRUE;
else if (priv->vscrollbar_policy == GTK_POLICY_NEVER)
else if (priv->vscrollbar_policy == GTK_POLICY_NEVER ||
priv->vscrollbar_policy == GTK_POLICY_EXTERNAL)
priv->vscrollbar_visible = FALSE;
child = gtk_bin_get_child (bin);
@ -2145,21 +2159,21 @@ gtk_scrolled_window_size_allocate (GtkWidget *widget,
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
priv->hscrollbar_visible = priv->hscrollbar_policy < GTK_POLICY_NEVER;
priv->vscrollbar_visible = child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? sb_height + sb_spacing : 0);
}
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
priv->vscrollbar_visible = priv->vscrollbar_policy < GTK_POLICY_NEVER;
if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC)
priv->hscrollbar_visible =
child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? 0 : sb_width + sb_spacing);
else
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
priv->hscrollbar_visible = priv->hscrollbar_policy < GTK_POLICY_NEVER;
}
}
else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT */
@ -2206,21 +2220,21 @@ gtk_scrolled_window_size_allocate (GtkWidget *widget,
}
else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
priv->vscrollbar_visible = priv->vscrollbar_policy < GTK_POLICY_NEVER;
priv->hscrollbar_visible = child_scroll_width > allocation->width -
(priv->vscrollbar_visible ? sb_width + sb_spacing : 0);
}
}
else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */
{
priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER;
priv->hscrollbar_visible = priv->hscrollbar_policy < GTK_POLICY_NEVER;
if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC)
priv->vscrollbar_visible =
child_scroll_height > allocation->height -
(priv->hscrollbar_visible ? 0 : sb_height + sb_spacing);
else
priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER;
priv->vscrollbar_visible = priv->vscrollbar_policy < GTK_POLICY_NEVER;
}
}
@ -2240,12 +2254,12 @@ gtk_scrolled_window_size_allocate (GtkWidget *widget,
* if they logically did not change since the last configuration
*/
if (priv->hscrollbar)
gtk_scrolled_window_adjustment_changed
(gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)), scrolled_window);
gtk_scrolled_window_adjustment_changed
(gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)), scrolled_window);
if (priv->vscrollbar)
gtk_scrolled_window_adjustment_changed
(gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)), scrolled_window);
gtk_scrolled_window_adjustment_changed
(gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)), scrolled_window);
/* If, after the first iteration, the hscrollbar and the
* vscrollbar flip visiblity... or if one of the scrollbars flip
@ -2374,7 +2388,7 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
if (gdk_event_get_scroll_deltas ((GdkEvent *) event, &delta_x, &delta_y))
{
if (delta_x != 0.0 &&
gtk_widget_get_visible (priv->hscrollbar))
may_hscroll (scrolled_window))
{
GtkAdjustment *adj;
gdouble new_value;
@ -2401,7 +2415,7 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
}
if (delta_y != 0.0 &&
gtk_widget_get_visible (priv->vscrollbar))
may_vscroll (scrolled_window))
{
GtkAdjustment *adj;
gdouble new_value;
@ -2430,13 +2444,20 @@ gtk_scrolled_window_scroll_event (GtkWidget *widget,
else
{
GtkWidget *range;
gboolean may_scroll;
if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN)
range = priv->vscrollbar;
{
range = priv->vscrollbar;
may_scroll = may_vscroll (scrolled_window);
}
else
range = priv->hscrollbar;
{
range = priv->hscrollbar;
may_scroll = may_hscroll (scrolled_window);
}
if (range && gtk_widget_get_visible (range))
if (range && may_scroll)
{
GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range));
gdouble new_value;
@ -2587,7 +2608,7 @@ gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window)
data->scrolled_window = scrolled_window;
data->last_deceleration_time = gdk_frame_clock_get_frame_time (frame_clock);
if (priv->hscrollbar_visible)
if (may_hscroll (scrolled_window))
{
gdouble lower,upper;
GtkAdjustment *hadjustment;
@ -2606,7 +2627,7 @@ gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window)
priv->x_velocity);
}
if (priv->vscrollbar_visible)
if (may_vscroll (scrolled_window))
{
gdouble lower,upper;
GtkAdjustment *vadjustment;
@ -2938,7 +2959,7 @@ gtk_scrolled_window_get_preferred_size (GtkWidget *widget,
natural_req.width = MAX (natural_req.width, min_content_width);
extra_width = -1;
}
else
else if (priv->vscrollbar_policy < GTK_POLICY_NEVER)
{
minimum_req.width += vscrollbar_requisition.width;
natural_req.width += vscrollbar_requisition.width;
@ -2966,7 +2987,7 @@ gtk_scrolled_window_get_preferred_size (GtkWidget *widget,
natural_req.height = MAX (natural_req.height, min_content_height);
extra_height = -1;
}
else
else if (priv->vscrollbar_policy < GTK_POLICY_NEVER)
{
minimum_req.height += vscrollbar_requisition.height;
natural_req.height += vscrollbar_requisition.height;

6
gtk/gtkscrolledwindow.h
View File

@ -126,6 +126,9 @@ typedef enum
* For example, when all of a #GtkTreeView can not be seen.
* @GTK_POLICY_NEVER: The scrollbar should never appear. In this mode the
* content determines the size.
* @GTK_POLICY_EXTERNAL: Don't show a scrollbar, but don't force the
* size to follow the content. This can be used e.g. to make multiple
* scrolled windows share a scrollbar. Since: 3.16
*
* Determines how the size should be computed to achieve the one of the
* visibility mode for the scrollbars.
@ -134,7 +137,8 @@ typedef enum
{
GTK_POLICY_ALWAYS,
GTK_POLICY_AUTOMATIC,
GTK_POLICY_NEVER
GTK_POLICY_NEVER,
GTK_POLICY_EXTERNAL
} GtkPolicyType;