forked from AuroraMiddleware/gtk
541 lines
17 KiB
C
541 lines
17 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include "gtkviewport.h"
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#include "gtkadjustment.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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#include "gtkscrollable.h"
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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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/**
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* SECTION:gtkviewport
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* @Short_description: An adapter which makes widgets scrollable
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* @Title: GtkViewport
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* @See_also:#GtkScrolledWindow, #GtkAdjustment
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*
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* The #GtkViewport widget acts as an adaptor class, implementing
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* scrollability for child widgets that lack their own scrolling
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* capabilities. Use GtkViewport to scroll child widgets such as
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* #GtkGrid, #GtkBox, and so on.
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*
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* If a widget has native scrolling abilities, such as #GtkTextView,
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* #GtkTreeView or #GtkIconView, it can be added to a #GtkScrolledWindow
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* with gtk_container_add(). If a widget does not, you must first add the
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* widget to a #GtkViewport, then add the viewport to the scrolled window.
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* gtk_container_add() does this automatically if a child that does not
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* implement #GtkScrollable is added to a #GtkScrolledWindow, so you can
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* ignore the presence of the viewport.
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*
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* The GtkViewport will start scrolling content only if allocated less
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* than the child widget’s minimum size in a given orientation.
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*
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* # CSS nodes
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*
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* GtkViewport has a single CSS node with name viewport.
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*/
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typedef struct _GtkViewportPrivate GtkViewportPrivate;
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typedef struct _GtkViewportClass GtkViewportClass;
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struct _GtkViewport
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{
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GtkBin parent_instance;
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};
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struct _GtkViewportPrivate
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{
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GtkAdjustment *hadjustment;
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GtkAdjustment *vadjustment;
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GtkShadowType shadow_type;
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/* GtkScrollablePolicy needs to be checked when
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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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};
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struct _GtkViewportClass
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{
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GtkBinClass parent_class;
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};
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enum {
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PROP_0,
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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_SHADOW_TYPE
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};
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static void gtk_viewport_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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static void gtk_viewport_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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static void gtk_viewport_destroy (GtkWidget *widget);
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static void gtk_viewport_size_allocate (GtkWidget *widget,
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int width,
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int height,
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int baseline);
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static void gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
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gpointer data);
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static void viewport_set_adjustment (GtkViewport *viewport,
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GtkOrientation orientation,
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GtkAdjustment *adjustment);
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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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static void
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viewport_set_adjustment_values (GtkViewport *viewport,
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GtkOrientation orientation)
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{
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GtkBin *bin = GTK_BIN (viewport);
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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GtkAdjustment *adjustment;
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GtkScrollablePolicy scroll_policy;
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GtkScrollablePolicy other_scroll_policy;
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GtkOrientation other_orientation;
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GtkWidget *child;
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gdouble upper, value;
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int viewport_size, other_viewport_size;
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int view_width, view_height;
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view_width = gtk_widget_get_width (GTK_WIDGET (viewport));
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view_height = gtk_widget_get_height (GTK_WIDGET (viewport));
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if (orientation == GTK_ORIENTATION_HORIZONTAL)
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{
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adjustment = priv->hadjustment;
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other_orientation = GTK_ORIENTATION_VERTICAL;
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viewport_size = view_width;
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other_viewport_size = view_height;
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scroll_policy = priv->hscroll_policy;
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other_scroll_policy = priv->vscroll_policy;
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}
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else /* VERTICAL */
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{
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adjustment = priv->vadjustment;
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other_orientation = GTK_ORIENTATION_HORIZONTAL;
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viewport_size = view_height;
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other_viewport_size = view_width;
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scroll_policy = priv->vscroll_policy;
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other_scroll_policy = priv->hscroll_policy;
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}
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child = gtk_bin_get_child (bin);
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if (child && gtk_widget_get_visible (child))
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{
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int min_size, nat_size;
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int scroll_size;
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if (other_scroll_policy == GTK_SCROLL_MINIMUM)
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gtk_widget_measure (child, other_orientation, -1,
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&scroll_size, NULL, NULL, NULL);
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else
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gtk_widget_measure (child, other_orientation, -1,
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NULL, &scroll_size, NULL, NULL);
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gtk_widget_measure (child, orientation,
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MAX (other_viewport_size, scroll_size),
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&min_size, &nat_size, NULL, NULL);
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if (scroll_policy == GTK_SCROLL_MINIMUM)
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upper = MAX (min_size, viewport_size);
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else
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upper = MAX (nat_size, viewport_size);
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}
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else
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{
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upper = viewport_size;
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}
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value = gtk_adjustment_get_value (adjustment);
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/* We clamp to the left in RTL mode */
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if (orientation == GTK_ORIENTATION_HORIZONTAL &&
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_gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
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{
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gdouble dist = gtk_adjustment_get_upper (adjustment)
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- value
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- gtk_adjustment_get_page_size (adjustment);
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value = upper - dist - viewport_size;
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}
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gtk_adjustment_configure (adjustment,
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value,
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0,
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upper,
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viewport_size * 0.1,
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viewport_size * 0.9,
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viewport_size);
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}
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static void
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gtk_viewport_measure (GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum,
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int *natural,
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int *minimum_baseline,
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int *natural_baseline)
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{
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GtkWidget *child;
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*minimum = *natural = 0;
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child = gtk_bin_get_child (GTK_BIN (widget));
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if (child && gtk_widget_get_visible (child))
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gtk_widget_measure (child,
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orientation,
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for_size,
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minimum, natural,
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NULL, NULL);
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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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GObjectClass *gobject_class;
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GtkWidgetClass *widget_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->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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gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_VIEWPORT);
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/* GtkScrollable implementation */
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g_object_class_override_property (gobject_class, PROP_HADJUSTMENT, "hadjustment");
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g_object_class_override_property (gobject_class, PROP_VADJUSTMENT, "vadjustment");
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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_SHADOW_TYPE,
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g_param_spec_enum ("shadow-type",
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P_("Shadow type"),
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P_("Determines how the shadowed box around the viewport is drawn"),
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GTK_TYPE_SHADOW_TYPE,
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GTK_SHADOW_IN,
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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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static void
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gtk_viewport_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkViewport *viewport = GTK_VIEWPORT (object);
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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switch (prop_id)
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{
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case PROP_HADJUSTMENT:
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viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, g_value_get_object (value));
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break;
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case PROP_VADJUSTMENT:
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viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, g_value_get_object (value));
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break;
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case PROP_HSCROLL_POLICY:
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if (priv->hscroll_policy != g_value_get_enum (value))
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{
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priv->hscroll_policy = g_value_get_enum (value);
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gtk_widget_queue_resize (GTK_WIDGET (viewport));
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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_VSCROLL_POLICY:
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if (priv->vscroll_policy != g_value_get_enum (value))
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{
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priv->vscroll_policy = g_value_get_enum (value);
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gtk_widget_queue_resize (GTK_WIDGET (viewport));
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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_SHADOW_TYPE:
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gtk_viewport_set_shadow_type (viewport, g_value_get_enum (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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}
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}
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static void
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gtk_viewport_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkViewport *viewport = GTK_VIEWPORT (object);
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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switch (prop_id)
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{
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case PROP_HADJUSTMENT:
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g_value_set_object (value, priv->hadjustment);
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break;
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case PROP_VADJUSTMENT:
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g_value_set_object (value, priv->vadjustment);
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break;
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case PROP_HSCROLL_POLICY:
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g_value_set_enum (value, priv->hscroll_policy);
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break;
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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_SHADOW_TYPE:
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g_value_set_enum (value, priv->shadow_type);
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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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}
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}
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static void
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gtk_viewport_init (GtkViewport *viewport)
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{
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GtkWidget *widget;
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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widget = GTK_WIDGET (viewport);
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gtk_widget_set_has_surface (widget, FALSE);
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gtk_widget_set_overflow (widget, GTK_OVERFLOW_HIDDEN);
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priv->shadow_type = GTK_SHADOW_IN;
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priv->hadjustment = NULL;
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priv->vadjustment = NULL;
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gtk_style_context_add_class (gtk_widget_get_style_context (widget),
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GTK_STYLE_CLASS_FRAME);
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viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, NULL);
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viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, NULL);
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}
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/**
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* gtk_viewport_new:
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* @hadjustment: (allow-none): horizontal adjustment
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* @vadjustment: (allow-none): vertical adjustment
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*
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* Creates a new #GtkViewport with the given adjustments, or with default
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* adjustments if none are given.
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*
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* Returns: a new #GtkViewport
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*/
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GtkWidget*
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gtk_viewport_new (GtkAdjustment *hadjustment,
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GtkAdjustment *vadjustment)
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{
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GtkWidget *viewport;
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viewport = g_object_new (GTK_TYPE_VIEWPORT,
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"hadjustment", hadjustment,
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"vadjustment", vadjustment,
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NULL);
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return viewport;
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}
|
||
|
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#define ADJUSTMENT_POINTER(orientation) \
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(((orientation) == GTK_ORIENTATION_HORIZONTAL) ? \
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&priv->hadjustment : &priv->vadjustment)
|
||
|
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static void
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viewport_disconnect_adjustment (GtkViewport *viewport,
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GtkOrientation orientation)
|
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{
|
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GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
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GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (orientation);
|
||
|
||
if (*adjustmentp)
|
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{
|
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g_signal_handlers_disconnect_by_func (*adjustmentp,
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gtk_viewport_adjustment_value_changed,
|
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viewport);
|
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g_object_unref (*adjustmentp);
|
||
*adjustmentp = NULL;
|
||
}
|
||
}
|
||
|
||
static void
|
||
gtk_viewport_destroy (GtkWidget *widget)
|
||
{
|
||
GtkViewport *viewport = GTK_VIEWPORT (widget);
|
||
|
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viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
|
||
viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
|
||
|
||
GTK_WIDGET_CLASS (gtk_viewport_parent_class)->destroy (widget);
|
||
}
|
||
|
||
static void
|
||
viewport_set_adjustment (GtkViewport *viewport,
|
||
GtkOrientation orientation,
|
||
GtkAdjustment *adjustment)
|
||
{
|
||
GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
|
||
GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (orientation);
|
||
|
||
if (adjustment && adjustment == *adjustmentp)
|
||
return;
|
||
|
||
if (!adjustment)
|
||
adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
|
||
viewport_disconnect_adjustment (viewport, orientation);
|
||
*adjustmentp = adjustment;
|
||
g_object_ref_sink (adjustment);
|
||
|
||
viewport_set_adjustment_values (viewport, orientation);
|
||
|
||
g_signal_connect (adjustment, "value-changed",
|
||
G_CALLBACK (gtk_viewport_adjustment_value_changed),
|
||
viewport);
|
||
|
||
gtk_viewport_adjustment_value_changed (adjustment, viewport);
|
||
}
|
||
|
||
/**
|
||
* gtk_viewport_set_shadow_type:
|
||
* @viewport: a #GtkViewport.
|
||
* @type: the new shadow type.
|
||
*
|
||
* Sets the shadow type of the viewport.
|
||
**/
|
||
void
|
||
gtk_viewport_set_shadow_type (GtkViewport *viewport,
|
||
GtkShadowType type)
|
||
{
|
||
GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
|
||
GtkWidget *widget;
|
||
GtkStyleContext *context;
|
||
|
||
g_return_if_fail (GTK_IS_VIEWPORT (viewport));
|
||
|
||
widget = GTK_WIDGET (viewport);
|
||
|
||
if ((GtkShadowType) priv->shadow_type != type)
|
||
{
|
||
priv->shadow_type = type;
|
||
|
||
context = gtk_widget_get_style_context (widget);
|
||
if (type != GTK_SHADOW_NONE)
|
||
gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME);
|
||
else
|
||
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_FRAME);
|
||
|
||
gtk_widget_queue_resize (widget);
|
||
|
||
g_object_notify (G_OBJECT (viewport), "shadow-type");
|
||
}
|
||
}
|
||
|
||
/**
|
||
* gtk_viewport_get_shadow_type:
|
||
* @viewport: a #GtkViewport
|
||
*
|
||
* Gets the shadow type of the #GtkViewport. See
|
||
* gtk_viewport_set_shadow_type().
|
||
*
|
||
* Returns: the shadow type
|
||
**/
|
||
GtkShadowType
|
||
gtk_viewport_get_shadow_type (GtkViewport *viewport)
|
||
{
|
||
GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
|
||
|
||
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
|
||
|
||
return priv->shadow_type;
|
||
}
|
||
|
||
static void
|
||
gtk_viewport_size_allocate (GtkWidget *widget,
|
||
int width,
|
||
int height,
|
||
int baseline)
|
||
{
|
||
GtkViewport *viewport = GTK_VIEWPORT (widget);
|
||
GtkViewportPrivate *priv = gtk_viewport_get_instance_private (viewport);
|
||
GtkAdjustment *hadjustment = priv->hadjustment;
|
||
GtkAdjustment *vadjustment = priv->vadjustment;
|
||
GtkWidget *child;
|
||
|
||
g_object_freeze_notify (G_OBJECT (hadjustment));
|
||
g_object_freeze_notify (G_OBJECT (vadjustment));
|
||
|
||
viewport_set_adjustment_values (viewport, GTK_ORIENTATION_HORIZONTAL);
|
||
viewport_set_adjustment_values (viewport, GTK_ORIENTATION_VERTICAL);
|
||
|
||
child = gtk_bin_get_child (GTK_BIN (widget));
|
||
if (child && gtk_widget_get_visible (child))
|
||
{
|
||
GtkAllocation child_allocation;
|
||
|
||
child_allocation.x = - gtk_adjustment_get_value (hadjustment);
|
||
child_allocation.y = - gtk_adjustment_get_value (vadjustment);
|
||
child_allocation.width = gtk_adjustment_get_upper (hadjustment);
|
||
child_allocation.height = gtk_adjustment_get_upper (vadjustment);
|
||
|
||
gtk_widget_size_allocate (child, &child_allocation, -1);
|
||
}
|
||
|
||
g_object_thaw_notify (G_OBJECT (hadjustment));
|
||
g_object_thaw_notify (G_OBJECT (vadjustment));
|
||
}
|
||
|
||
static void
|
||
gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
|
||
gpointer data)
|
||
{
|
||
gtk_widget_queue_allocate (GTK_WIDGET (data));
|
||
}
|