talkatu/talkatu

Replace TalkatuScrolledWindow with TalkatuAutoScroller
gtk4
22 months ago, Gary Kramlich
79f814e6b5cb
Parents 3c633be6b13e
Children b2089d187528
Replace TalkatuScrolledWindow with TalkatuAutoScroller

GtkScrolledWindow is a final type in GTK4, so we can no longer subclass it. To
work around this, TalkatuAutoScroller was created which is a GtkAdjustment
subclass that does the same thing TalkatuScrolledWindow did.

Testing Done:
Ran the demo and verified that auto scroll worked properly.

Reviewed at https://reviews.imfreedom.org/r/1658/
9 files changed, 208 insertions(+), 329 deletions(-)
  • +6 -8
    demo/data/demo.ui
  • +1 -1
    po/POTFILES
  • +0 -23
    talkatu/data/scrolledwindow.ui
  • +0 -1
    talkatu/data/talkatu.gresource.xml
  • +2 -2
    talkatu/meson.build
  • +154 -0
    talkatu/talkatuautoscroller.c
  • +45 -0
    talkatu/talkatuautoscroller.h
  • +0 -247
    talkatu/talkatuscrolledwindow.c
  • +0 -47
    talkatu/talkatuscrolledwindow.h
    • --- a/demo/data/demo.ui Thu Aug 25 03:22:24 2022 -0500
    +++ b/demo/data/demo.ui Fri Aug 26 03:08:51 2022 -0500
    @@ -25,6 +25,7 @@
    <!-- interface-name Talkatu -->
    <!-- interface-description GTK widgets for chat applications -->
    <!-- interface-copyright Gary Kramlich <grim@reaperworld.com> -->
    + <object class="TalkatuAutoScroller" id="auto_scroller"/>
    <template class="TalkatuDemoWindow" parent="GtkApplicationWindow">
    <property name="child">
    <object class="GtkPaned">
    @@ -33,14 +34,11 @@
    <property name="orientation">vertical</property>
    <property name="wide-handle">1</property>
    <child>
    - <object class="TalkatuScrolledWindow">
    - <child internal-child="scrolled_window">
    - <object class="GtkScrolledWindow" id="scrolled_window">
    - <child>
    - <object class="TalkatuHistory" id="history">
    - <property name="name">history</property>
    - </object>
    - </child>
    + <object class="GtkScrolledWindow">
    + <property name="vadjustment">auto_scroller</property>
    + <child>
    + <object class="TalkatuHistory" id="history">
    + <property name="name">history</property>
    </object>
    </child>
    </object>
    --- a/po/POTFILES Thu Aug 25 03:22:24 2022 -0500
    +++ b/po/POTFILES Fri Aug 26 03:08:51 2022 -0500
    @@ -16,6 +16,7 @@
    talkatu/talkatuattachment.c
    talkatu/talkatuattachmentdialog.c
    talkatu/talkatuattachmentpreview.c
    +talkatu/talkatuautoscroller.c
    talkatu/talkatubuffer.c
    talkatu/talkatucodeset.c
    talkatu/talkatucore.c
    @@ -29,7 +30,6 @@
    talkatu/talkatumarkdownbuffer.c
    talkatu/talkatumarkup.c
    talkatu/talkatumessage.c
    -talkatu/talkatuscrolledwindow.c
    talkatu/talkatusimpleattachment.c
    talkatu/talkatutag.c
    talkatu/talkatutagtable.c
    --- a/talkatu/data/scrolledwindow.ui Thu Aug 25 03:22:24 2022 -0500
    +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
    @@ -1,23 +0,0 @@
    -<?xml version="1.0" encoding="UTF-8"?>
    -<interface>
    - <requires lib="gtk" version="4.0"/>
    - <template class="TalkatuScrolledWindow" parent="GtkWidget">
    - <child>
    - <object class="GtkScrolledWindow" id="scrolled_window">
    - <property name="vexpand">1</property>
    - <property name="hexpand">1</property>
    - <property name="focusable">1</property>
    - <property name="vadjustment">vadjustment</property>
    - <property name="min-content-height">150</property>
    - <property name="vscrollbar-policy">2</property>
    - </object>
    - </child>
    - </template>
    - <object class="GtkAdjustment" id="vadjustment">
    - <property name="upper">100</property>
    - <property name="step-increment">1</property>
    - <property name="page-increment">10</property>
    - <signal name="changed" handler="talkatu_scrolled_window_vadjustment_changed_cb" object="TalkatuScrolledWindow" swapped="no"/>
    - <signal name="value-changed" handler="talkatu_scrolled_window_vadjustment_value_changed_cb" object="TalkatuScrolledWindow" swapped="no"/>
    - </object>
    -</interface>
    --- a/talkatu/data/talkatu.gresource.xml Thu Aug 25 03:22:24 2022 -0500
    +++ b/talkatu/data/talkatu.gresource.xml Fri Aug 26 03:08:51 2022 -0500
    @@ -8,7 +8,6 @@
    <file compressed="true">historyrow.ui</file>
    <file compressed="true">input.ui</file>
    <file compressed="true">linkdialog.ui</file>
    - <file compressed="true">scrolledwindow.ui</file>
    <file compressed="true">toolbar.ui</file>
    <file compressed="true">typinglabel.ui</file>
    <file compressed="true">view.ui</file>
    --- a/talkatu/meson.build Thu Aug 25 03:22:24 2022 -0500
    +++ b/talkatu/meson.build Fri Aug 26 03:08:51 2022 -0500
    @@ -8,6 +8,7 @@
    'talkatuattachment.h',
    'talkatuattachmentdialog.h',
    'talkatuattachmentpreview.h',
    + 'talkatuautoscroller.h',
    'talkatubuffer.h',
    'talkatucodeset.h',
    'talkatucore.h',
    @@ -22,7 +23,6 @@
    'talkatumarkdownbuffer.h',
    'talkatumarkup.h',
    'talkatumessage.h',
    - 'talkatuscrolledwindow.h',
    'talkatusimpleattachment.h',
    'talkatutag.h',
    'talkatutagtable.h',
    @@ -37,6 +37,7 @@
    'talkatuattachment.c',
    'talkatuattachmentdialog.c',
    'talkatuattachmentpreview.c',
    + 'talkatuautoscroller.c',
    'talkatubuffer.c',
    'talkatucodeset.c',
    'talkatucore.c',
    @@ -51,7 +52,6 @@
    'talkatumarkdownbuffer.c',
    'talkatumarkup.c',
    'talkatumessage.c',
    - 'talkatuscrolledwindow.c',
    'talkatusimpleattachment.c',
    'talkatutag.c',
    'talkatutagtable.c',
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/talkatu/talkatuautoscroller.c Fri Aug 26 03:08:51 2022 -0500
    @@ -0,0 +1,154 @@
    +/*
    + * Talkatu - GTK widgets for chat applications
    + * Copyright (C) 2017-2020 Gary Kramlich <grim@reaperworld.com>
    + *
    + * This library is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 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 General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this library; if not, see <https://www.gnu.org/licenses/>.
    + */
    +
    +#include <gtk/gtk.h>
    +
    +#include <talkatu/talkatuautoscroller.h>
    +
    +/**
    + * TalkatuAutoScroller:
    + *
    + * This is a simple subclass of [class@Gtk.Adjustment] that has helpers for
    + * keyboard navigation as well as the ability to automatically scroll to the
    + * max when new items are added if the widget was already scrolled all the
    + * way to the bottom.
    + */
    +struct _TalkatuAutoScroller {
    + GtkAdjustment parent;
    +
    + gboolean auto_scroll;
    +};
    +
    +G_DEFINE_TYPE(TalkatuAutoScroller, talkatu_auto_scroller, GTK_TYPE_ADJUSTMENT)
    +
    +/******************************************************************************
    + * Callbacks
    + *****************************************************************************/
    +static gboolean
    +talkatu_auto_scroller_scroll(gpointer data) {
    + GtkAdjustment *adjustment = data;
    +
    + gdouble upper, pagesize;
    +
    + upper = gtk_adjustment_get_upper(adjustment);
    + pagesize = gtk_adjustment_get_page_size(adjustment);
    +
    + gtk_adjustment_set_value(adjustment, upper - pagesize);
    +
    + return G_SOURCE_REMOVE;
    +}
    +
    +static void
    +talkatu_auto_scroller_changed(GtkAdjustment *adjustment) {
    + TalkatuAutoScroller *auto_scroller = TALKATU_AUTO_SCROLLER(adjustment);
    +
    + if(auto_scroller->auto_scroll) {
    + /* If we set the value here, we interrupt the updates to the other
    + * values of the adjustment which breaks the adjustment.
    + *
    + * The specific behavior we've seen is that the upper property doesn't
    + * get updated when we call set value here. Which means you can't even
    + * scroll down anymore in a scrolled window because you're already at
    + * the upper bound. However, if you scroll up, even if there's no where
    + * to scroll, it will update the adjustment's properties and you can
    + * then scroll down.
    + *
    + * By using a timeout to set the value during the next main loop
    + * iteration we avoid this problem.
    + */
    + g_timeout_add(0, talkatu_auto_scroller_scroll, adjustment);
    + }
    +}
    +
    +static void
    +talkatu_auto_scroller_value_changed(GtkAdjustment *adjustment) {
    + TalkatuAutoScroller *auto_scroller = TALKATU_AUTO_SCROLLER(adjustment);
    + gdouble current, upper, pagesize;
    +
    + current = gtk_adjustment_get_value(adjustment);
    + upper = gtk_adjustment_get_upper(adjustment);
    + pagesize = gtk_adjustment_get_page_size(adjustment);
    +
    + auto_scroller->auto_scroll = (current + pagesize >= upper);
    +}
    +
    +/******************************************************************************
    + * GObject Implementation
    + *****************************************************************************/
    +static void
    +talkatu_auto_scroller_init(TalkatuAutoScroller *auto_scroller) {
    + auto_scroller->auto_scroll = TRUE;
    +}
    +
    +static void
    +talkatu_auto_scroller_class_init(TalkatuAutoScrollerClass *klass) {
    + GtkAdjustmentClass *adjustment_class = GTK_ADJUSTMENT_CLASS(klass);
    +
    + adjustment_class->changed = talkatu_auto_scroller_changed;
    + adjustment_class->value_changed = talkatu_auto_scroller_value_changed;
    +}
    +
    +/******************************************************************************
    + * Public API
    + *****************************************************************************/
    +
    +/**
    + * talkatu_auto_scroller_new:
    + *
    + * Creates a new #TalkatuAutoScroller.
    + *
    + * Returns: (transfer full): The new #TalkatuAutoScroller instance.
    + */
    +GtkAdjustment *
    +talkatu_auto_scroller_new(void) {
    + return g_object_new(TALKATU_TYPE_AUTO_SCROLLER, NULL);
    +}
    +
    +/**
    + * talkatu_auto_scroller_decrement:
    + * @auto_scroller: The #TalkatuAutoScroller instance.
    + *
    + * Decrements the value of @auto_scroller by a page increment.
    + */
    +void
    +talkatu_auto_scroller_decrement(TalkatuAutoScroller *auto_scroller) {
    + gdouble value = 0.0;
    +
    + g_return_if_fail(TALKATU_IS_AUTO_SCROLLER(auto_scroller));
    +
    + value = gtk_adjustment_get_value(GTK_ADJUSTMENT(auto_scroller));
    + value -= gtk_adjustment_get_page_increment(GTK_ADJUSTMENT(auto_scroller));
    + gtk_adjustment_set_value(GTK_ADJUSTMENT(auto_scroller), value);
    +}
    +
    +/**
    + * talkatu_auto_scroller_increment:
    + * @auto_scroller: The #TalkatuAutoScroller instance.
    + *
    + * Increments the value of @auto_scroller by a page increment.
    + */
    +void
    +talkatu_auto_scroller_page_down(TalkatuAutoScroller *auto_scroller) {
    + gdouble value = 0.0;
    +
    + g_return_if_fail(TALKATU_IS_AUTO_SCROLLER(auto_scroller));
    +
    + value = gtk_adjustment_get_value(GTK_ADJUSTMENT(auto_scroller));
    + value += gtk_adjustment_get_page_increment(GTK_ADJUSTMENT(auto_scroller));
    + gtk_adjustment_set_value(GTK_ADJUSTMENT(auto_scroller), value);
    +}
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/talkatu/talkatuautoscroller.h Fri Aug 26 03:08:51 2022 -0500
    @@ -0,0 +1,45 @@
    +/*
    + * Talkatu - GTK widgets for chat applications
    + * Copyright (C) 2017-2020 Gary Kramlich <grim@reaperworld.com>
    + *
    + * This library is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 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 General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this library; if not, see <https://www.gnu.org/licenses/>.
    + */
    +
    +#if !defined(TALKATU_GLOBAL_HEADER_INSIDE) && !defined(TALKATU_COMPILATION)
    +#error "only <talkatu.h> may be included directly"
    +#endif
    +
    +#ifndef TALKATU_AUTO_SCROLLER_H
    +#define TALKATU_AUTO_SCROLLER_H
    +
    +#include <glib.h>
    +#include <glib-object.h>
    +
    +#include <gtk/gtk.h>
    +
    +G_BEGIN_DECLS
    +
    +#define TALKATU_TYPE_AUTO_SCROLLER (talkatu_auto_scroller_get_type())
    +
    +G_DECLARE_FINAL_TYPE(TalkatuAutoScroller, talkatu_auto_scroller, TALKATU,
    + AUTO_SCROLLER, GtkAdjustment)
    +
    +GtkAdjustment *talkatu_auto_scroller_new(void);
    +
    +void talkatu_auto_scroller_decrement(TalkatuAutoScroller *auto_scroller);
    +void talkatu_auto_scroller_increment(TalkatuAutoScroller *auto_scroller);
    +
    +G_END_DECLS
    +
    +#endif /* TALKATU_AUTO_SCROLLER_H */
    --- a/talkatu/talkatuscrolledwindow.c Thu Aug 25 03:22:24 2022 -0500
    +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
    @@ -1,247 +0,0 @@
    -/*
    - * Talkatu - GTK widgets for chat applications
    - * Copyright (C) 2017-2020 Gary Kramlich <grim@reaperworld.com>
    - *
    - * This library is free software; you can redistribute it and/or modify
    - * it under the terms of the GNU General Public License as published by
    - * the Free Software Foundation; either version 2 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 General Public License for more details.
    - *
    - * You should have received a copy of the GNU General Public License
    - * along with this library; if not, see <https://www.gnu.org/licenses/>.
    - */
    -
    -#include <gtk/gtk.h>
    -
    -#include <talkatu/talkatuscrolledwindow.h>
    -
    -/**
    - * TalkatuScrolledWindow:
    - * This widget is a simple subclass of #GtkScrolledWindow that has helpers for
    - * keyboard navigation as well as the ability to automatically scroll to the
    - * bottom when new items are added if the widget was already scrolled all the
    - * way to the bottom.
    - */
    -struct _TalkatuScrolledWindow {
    - GtkWidget parent;
    -
    - GtkWidget *scrolled_window;
    - GtkAdjustment *vadjustment;
    - gboolean auto_scroll;
    -};
    -
    -enum {
    - PROP_0,
    - PROP_CHILD,
    - N_PROPERTIES,
    -};
    -static GParamSpec *properties[N_PROPERTIES] = { NULL, };
    -
    -/******************************************************************************
    - * Callbacks
    - *****************************************************************************/
    -static void
    -talkatu_scrolled_window_vadjustment_changed_cb(GtkAdjustment *adjustment,
    - gpointer data)
    -{
    - TalkatuScrolledWindow *sw = TALKATU_SCROLLED_WINDOW(data);
    -
    - if(sw->auto_scroll) {
    - gdouble upper, pagesize;
    -
    - upper = gtk_adjustment_get_upper(adjustment);
    - pagesize = gtk_adjustment_get_page_size(adjustment);
    -
    - gtk_adjustment_set_value(adjustment, upper - pagesize);
    - }
    -}
    -
    -static void
    -talkatu_scrolled_window_vadjustment_value_changed_cb(GtkAdjustment *adjustment,
    - gpointer data)
    -{
    - TalkatuScrolledWindow *sw = TALKATU_SCROLLED_WINDOW(data);
    - gdouble current, upper, pagesize;
    -
    - current = gtk_adjustment_get_value(adjustment);
    - upper = gtk_adjustment_get_upper(adjustment);
    - pagesize = gtk_adjustment_get_page_size(adjustment);
    -
    - sw->auto_scroll = (current + pagesize >= upper);
    -}
    -
    -/******************************************************************************
    - * GObject Implementation
    - *****************************************************************************/
    -G_DEFINE_TYPE(TalkatuScrolledWindow, talkatu_scrolled_window, GTK_TYPE_WIDGET)
    -
    -static void
    -tatlkatu_scrolled_window_get_property(GObject *obj, guint param_id,
    - GValue *value, GParamSpec *pspec)
    -{
    - TalkatuScrolledWindow *sw = TALKATU_SCROLLED_WINDOW(obj);
    -
    - switch(param_id) {
    - case PROP_CHILD:
    - g_value_set_object(value, talkatu_scrolled_window_get_child(sw));
    - break;
    - default:
    - G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, param_id, pspec);
    - break;
    - }
    -}
    -
    -static void
    -tatlkatu_scrolled_window_set_property(GObject *obj, guint param_id,
    - const GValue *value, GParamSpec *pspec)
    -{
    - TalkatuScrolledWindow *sw = TALKATU_SCROLLED_WINDOW(obj);
    -
    - switch(param_id) {
    - case PROP_CHILD:
    - talkatu_scrolled_window_set_child(sw, g_value_get_object(value));
    - break;
    - default:
    - G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, param_id, pspec);
    - break;
    - }
    -}
    -
    -static void
    -talkatu_scrolled_window_dispose(GObject *obj) {
    - TalkatuScrolledWindow *sw = TALKATU_SCROLLED_WINDOW(obj);
    -
    - g_clear_pointer(&sw->scrolled_window, gtk_widget_unparent);
    -
    - G_OBJECT_CLASS(talkatu_scrolled_window_parent_class)->dispose(obj);
    -}
    -
    -static void
    -talkatu_scrolled_window_init(TalkatuScrolledWindow *sw) {
    - gtk_widget_init_template(GTK_WIDGET(sw));
    -
    - sw->auto_scroll = TRUE;
    -}
    -
    -static void
    -talkatu_scrolled_window_class_init(TalkatuScrolledWindowClass *klass) {
    - GObjectClass *obj_class = G_OBJECT_CLASS(klass);
    - GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
    -
    - obj_class->get_property = tatlkatu_scrolled_window_get_property;
    - obj_class->set_property = tatlkatu_scrolled_window_set_property;
    - obj_class->dispose = talkatu_scrolled_window_dispose;
    -
    - /**
    - * TalkatuScrolledWindow::child:
    - *
    - * The child widget that should be displayed.
    - */
    - properties[PROP_CHILD] = g_param_spec_object(
    - "child", "child",
    - "The child widget to display",
    - GTK_TYPE_WIDGET,
    - G_PARAM_READWRITE);
    -
    - gtk_widget_class_set_layout_manager_type(widget_class, GTK_TYPE_BIN_LAYOUT);
    -
    - gtk_widget_class_set_template_from_resource(
    - widget_class,
    - "/org/imfreedom/keep/talkatu/talkatu/ui/scrolledwindow.ui"
    - );
    -
    - gtk_widget_class_bind_template_child_internal(widget_class,
    - TalkatuScrolledWindow,
    - scrolled_window);
    - gtk_widget_class_bind_template_child(widget_class, TalkatuScrolledWindow,
    - vadjustment);
    -
    - gtk_widget_class_bind_template_callback(widget_class, talkatu_scrolled_window_vadjustment_changed_cb);
    - gtk_widget_class_bind_template_callback(widget_class, talkatu_scrolled_window_vadjustment_value_changed_cb);
    -}
    -
    -/******************************************************************************
    - * Public API
    - *****************************************************************************/
    -
    -/**
    - * talkatu_scrolled_window_new:
    - *
    - * Creates a new #TalkatuScrolledWindow.
    - *
    - * Returns: (transfer full): The new #TalkatuScrolledWindow instance.
    - */
    -GtkWidget *
    -talkatu_scrolled_window_new(void) {
    - return g_object_new(TALKATU_TYPE_SCROLLED_WINDOW, NULL);
    -}
    -
    -/**
    - * talkatu_scrolled_window_page_up:
    - * @sw: The #TalkatuScrolledWindow instance.
    - *
    - * Scrolls @sw up one page.
    - */
    -void
    -talkatu_scrolled_window_page_up(TalkatuScrolledWindow *sw) {
    - gdouble value = 0.0;
    -
    - g_return_if_fail(TALKATU_IS_SCROLLED_WINDOW(sw));
    -
    - value = gtk_adjustment_get_value(sw->vadjustment);
    - value -= gtk_adjustment_get_page_increment(sw->vadjustment);
    - gtk_adjustment_set_value(sw->vadjustment, value);
    -}
    -
    -/**
    - * talkatu_scrolled_window_page_down:
    - * @sw: The #TalkatuScrolledWindow instance.
    - *
    - * Scrolls @sw down one page.
    - */
    -void
    -talkatu_scrolled_window_page_down(TalkatuScrolledWindow *sw) {
    - gdouble value = 0.0;
    -
    - g_return_if_fail(TALKATU_IS_SCROLLED_WINDOW(sw));
    -
    - value = gtk_adjustment_get_value(sw->vadjustment);
    - value += gtk_adjustment_get_page_increment(sw->vadjustment);
    - gtk_adjustment_set_value(sw->vadjustment, value);
    -}
    -
    -/**
    - * talkatu_scrolled_window_get_child:
    - * @sw: The scrolled window instance.
    - *
    - * Gets the child of @sw.
    - *
    - * Returns: (transfer none) (nullable): The child of @sw.
    - */
    -GtkWidget *
    -talkatu_scrolled_window_get_child(TalkatuScrolledWindow *sw) {
    - g_return_val_if_fail(TALKATU_IS_SCROLLED_WINDOW(sw), NULL);
    -
    - return gtk_scrolled_window_get_child(GTK_SCROLLED_WINDOW(sw->scrolled_window));
    -}
    -
    -/**
    - * talkatu_scrolled_window_set_child:
    - * @sw: The scrolled window instance.
    - * @child: (nullable): The new child or NULL to unset.
    - *
    - * Sets the child of @sw to @child.
    - */
    -void
    -talkatu_scrolled_window_set_child(TalkatuScrolledWindow *sw, GtkWidget *child)
    -{
    - g_return_if_fail(TALKATU_IS_SCROLLED_WINDOW(sw));
    -
    - gtk_scrolled_window_set_child(GTK_SCROLLED_WINDOW(sw->scrolled_window),
    - child);
    -}
    --- a/talkatu/talkatuscrolledwindow.h Thu Aug 25 03:22:24 2022 -0500
    +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
    @@ -1,47 +0,0 @@
    -/*
    - * Talkatu - GTK widgets for chat applications
    - * Copyright (C) 2017-2020 Gary Kramlich <grim@reaperworld.com>
    - *
    - * This library is free software; you can redistribute it and/or modify
    - * it under the terms of the GNU General Public License as published by
    - * the Free Software Foundation; either version 2 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 General Public License for more details.
    - *
    - * You should have received a copy of the GNU General Public License
    - * along with this library; if not, see <https://www.gnu.org/licenses/>.
    - */
    -
    -#if !defined(TALKATU_GLOBAL_HEADER_INSIDE) && !defined(TALKATU_COMPILATION)
    -#error "only <talkatu.h> may be included directly"
    -#endif
    -
    -#ifndef TALKATU_SCROLLED_WINDOW_H
    -#define TALKATU_SCROLLED_WINDOW_H
    -
    -#include <glib.h>
    -#include <glib-object.h>
    -
    -#include <gtk/gtk.h>
    -
    -G_BEGIN_DECLS
    -
    -#define TALKATU_TYPE_SCROLLED_WINDOW (talkatu_scrolled_window_get_type())
    -
    -G_DECLARE_FINAL_TYPE(TalkatuScrolledWindow, talkatu_scrolled_window, TALKATU, SCROLLED_WINDOW, GtkWidget)
    -
    -GtkWidget *talkatu_scrolled_window_new(void);
    -
    -void talkatu_scrolled_window_page_up(TalkatuScrolledWindow *sw);
    -void talkatu_scrolled_window_page_down(TalkatuScrolledWindow *sw);
    -
    -GtkWidget *talkatu_scrolled_window_get_child(TalkatuScrolledWindow *sw);
    -void talkatu_scrolled_window_set_child(TalkatuScrolledWindow *sw, GtkWidget *child);
    -
    -G_END_DECLS
    -
    -#endif /* TALKATU_SCROLLED_WINDOW_H */