forked from AuroraMiddleware/gtk
viewport: Add GtkViewport:scroll-to-focus
And implement this property by listening for focus changes, and updating the adjustments. This is a replacement for setting focus adjustments on containers.
This commit is contained in:
Matthias Clasen
parent
250036259a
commit
66347fa3bf
@ -26,7 +26,7 @@
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#include "gtkviewport.h"
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#include "gtkadjustment.h"
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#include "gtkadjustmentprivate.h"
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#include "gtkintl.h"
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#include "gtkmarshalers.h"
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#include "gtkprivate.h"
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@ -34,6 +34,7 @@
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#include "gtkstylecontext.h"
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#include "gtktypebuiltins.h"
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#include "gtkwidgetprivate.h"
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#include "gtktext.h"
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/**
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@ -80,6 +81,9 @@ struct _GtkViewportPrivate
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* driving the scrollable adjustment values */
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guint hscroll_policy : 1;
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guint vscroll_policy : 1;
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guint scroll_to_focus : 1;
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gulong focus_handler;
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};
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struct _GtkViewportClass
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@ -92,7 +96,8 @@ enum {
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PROP_HADJUSTMENT,
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PROP_VADJUSTMENT,
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PROP_HSCROLL_POLICY,
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PROP_VSCROLL_POLICY
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PROP_VSCROLL_POLICY,
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PROP_SCROLL_TO_FOCUS
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};
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@ -115,6 +120,9 @@ static void viewport_set_adjustment (GtkViewport *viewport,
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GtkOrientation orientation,
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GtkAdjustment *adjustment);
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static void setup_focus_change_handler (GtkViewport *viewport);
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static void clear_focus_change_handler (GtkViewport *viewport);
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G_DEFINE_TYPE_WITH_CODE (GtkViewport, gtk_viewport, GTK_TYPE_BIN,
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G_ADD_PRIVATE (GtkViewport)
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G_IMPLEMENT_INTERFACE (GTK_TYPE_SCROLLABLE, NULL))
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@ -228,6 +236,39 @@ gtk_viewport_measure (GtkWidget *widget,
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NULL, NULL);
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}
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static void
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gtk_viewport_dispose (GObject *object)
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{
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clear_focus_change_handler (GTK_VIEWPORT (object));
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G_OBJECT_CLASS (gtk_viewport_parent_class)->dispose (object);
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}
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static void
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gtk_viewport_root (GtkWidget *widget)
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{
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GtkViewport *viewport = GTK_VIEWPORT (widget);
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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GTK_WIDGET_CLASS (gtk_viewport_parent_class)->root (widget);
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if (priv->scroll_to_focus)
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setup_focus_change_handler (viewport);
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}
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static void
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gtk_viewport_unroot (GtkWidget *widget)
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{
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GtkViewport *viewport = GTK_VIEWPORT (widget);
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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if (priv->scroll_to_focus)
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clear_focus_change_handler (viewport);
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GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unroot (widget);
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}
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static void
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gtk_viewport_class_init (GtkViewportClass *class)
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{
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@ -237,12 +278,15 @@ gtk_viewport_class_init (GtkViewportClass *class)
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gobject_class = G_OBJECT_CLASS (class);
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widget_class = (GtkWidgetClass*) class;
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gobject_class->dispose = gtk_viewport_dispose;
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gobject_class->set_property = gtk_viewport_set_property;
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gobject_class->get_property = gtk_viewport_get_property;
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widget_class->destroy = gtk_viewport_destroy;
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widget_class->size_allocate = gtk_viewport_size_allocate;
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widget_class->measure = gtk_viewport_measure;
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widget_class->root = gtk_viewport_root;
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widget_class->unroot = gtk_viewport_unroot;
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gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_VIEWPORT);
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@ -252,6 +296,14 @@ gtk_viewport_class_init (GtkViewportClass *class)
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g_object_class_override_property (gobject_class, PROP_HSCROLL_POLICY, "hscroll-policy");
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g_object_class_override_property (gobject_class, PROP_VSCROLL_POLICY, "vscroll-policy");
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g_object_class_install_property (gobject_class,
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PROP_SCROLL_TO_FOCUS,
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g_param_spec_boolean ("scroll-to-focus",
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P_("Scroll to focus"),
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P_("Whether to scroll when the focus changes"),
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FALSE,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
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gtk_widget_class_set_css_name (widget_class, I_("viewport"));
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}
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@ -288,6 +340,9 @@ gtk_viewport_set_property (GObject *object,
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g_object_notify_by_pspec (object, pspec);
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}
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break;
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case PROP_SCROLL_TO_FOCUS:
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gtk_viewport_set_scroll_to_focus (viewport, g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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@ -317,6 +372,9 @@ gtk_viewport_get_property (GObject *object,
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case PROP_VSCROLL_POLICY:
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g_value_set_enum (value, priv->vscroll_policy);
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break;
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case PROP_SCROLL_TO_FOCUS:
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g_value_set_boolean (value, priv->scroll_to_focus);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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@ -464,3 +522,117 @@ gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
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{
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gtk_widget_queue_allocate (GTK_WIDGET (data));
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}
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gboolean
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gtk_viewport_get_scroll_to_focus (GtkViewport *viewport)
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{
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), FALSE);
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return priv->scroll_to_focus;
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}
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void
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gtk_viewport_set_scroll_to_focus (GtkViewport *viewport,
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gboolean scroll_to_focus)
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{
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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g_return_if_fail (GTK_IS_VIEWPORT (viewport));
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if (priv->scroll_to_focus == scroll_to_focus)
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return;
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priv->scroll_to_focus = scroll_to_focus;
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if (gtk_widget_get_root (GTK_WIDGET (viewport)))
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{
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if (scroll_to_focus)
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setup_focus_change_handler (viewport);
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else
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clear_focus_change_handler (viewport);
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}
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g_object_notify (G_OBJECT (viewport), "scroll-to-focus");
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}
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static void
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scroll_to_view (GtkAdjustment *adj,
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double pos,
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double size)
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{
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double value, page_size;
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value = gtk_adjustment_get_value (adj);
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page_size = gtk_adjustment_get_page_size (adj);
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if (pos < 0)
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gtk_adjustment_animate_to_value (adj, value + pos);
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else if (pos + size >= page_size)
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gtk_adjustment_animate_to_value (adj, value + pos + size - page_size);
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}
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static void
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focus_change_handler (GtkWidget *widget)
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{
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GtkViewport *viewport = GTK_VIEWPORT (widget);
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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GtkRoot *root;
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GtkWidget *focus_widget;
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GtkWidget *child;
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graphene_rect_t rect;
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int x, y;
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if ((gtk_widget_get_state_flags (widget) & GTK_STATE_FLAG_FOCUS_WITHIN) == 0)
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return;
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root = gtk_widget_get_root (widget);
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focus_widget = gtk_root_get_focus (root);
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if (!focus_widget)
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return;
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if (GTK_IS_TEXT (focus_widget))
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focus_widget = gtk_widget_get_parent (focus_widget);
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child = gtk_bin_get_child (GTK_BIN (viewport));
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if (!gtk_widget_compute_bounds (focus_widget, child, &rect))
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return;
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gtk_widget_translate_coordinates (child, widget,
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(int)rect.origin.x,
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(int)rect.origin.y,
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&x, &y);
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scroll_to_view (priv->hadjustment, x, rect.size.width);
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scroll_to_view (priv->vadjustment, y, rect.size.height);
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}
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static void
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setup_focus_change_handler (GtkViewport *viewport)
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{
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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GtkRoot *root;
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root = gtk_widget_get_root (GTK_WIDGET (viewport));
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priv->focus_handler = g_signal_connect_swapped (root, "notify::focus-widget",
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G_CALLBACK (focus_change_handler), viewport);
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}
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static void
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clear_focus_change_handler (GtkViewport *viewport)
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{
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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GtkRoot *root;
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root = gtk_widget_get_root (GTK_WIDGET (viewport));
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if (priv->focus_handler)
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{
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g_signal_handler_disconnect (root, priv->focus_handler);
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priv->focus_handler = 0;
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}
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}
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@ -50,6 +50,12 @@ GDK_AVAILABLE_IN_ALL
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GtkWidget* gtk_viewport_new (GtkAdjustment *hadjustment,
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GtkAdjustment *vadjustment);
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GDK_AVAILABLE_IN_ALL
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gboolean gtk_viewport_get_scroll_to_focus (GtkViewport *viewport);
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GDK_AVAILABLE_IN_ALL
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void gtk_viewport_set_scroll_to_focus (GtkViewport *viewport,
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gboolean scroll_to_focus);
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G_END_DECLS
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