379 lines
12 KiB
C
379 lines
12 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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-1999. 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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/*
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* Simple composite widget to provide vertical scrolling, based
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* on GtkRange widget code.
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* Modified by the Sylpheed Team and others 2003
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gtk/gtksignal.h>
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#include <gtk/gtkbutton.h>
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#include <gtk/gtkmisc.h>
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#include <gtk/gtk.h>
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#include <gtk/gtkbox.h>
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#include <gtk/gtkmain.h>
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#include "gtkvscrollbutton.h"
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#define SCROLL_TIMER_LENGTH 20
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#define SCROLL_INITIAL_DELAY 100 /* must hold button this long before ... */
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#define SCROLL_LATER_DELAY 20 /* ... it starts repeating at this rate */
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#define SCROLL_DELAY_LENGTH 300
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enum {
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ARG_0,
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ARG_ADJUSTMENT
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};
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static void gtk_vscrollbutton_class_init(GtkVScrollbuttonClass * klass);
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static void gtk_vscrollbutton_init(GtkVScrollbutton * vscrollbutton);
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GtkType gtk_vscrollbutton_get_type (void);
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GtkWidget *gtk_vscrollbutton_new (GtkAdjustment *adjustment);
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static gint gtk_vscrollbutton_button_release (GtkWidget *widget,
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GdkEventButton *event,
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GtkVScrollbutton *scrollbutton);
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static void gtk_vscrollbutton_set_adjustment (GtkVScrollbutton *scrollbutton,
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GtkAdjustment *adjustment);
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static gint gtk_vscrollbutton_button_press (GtkWidget *widget,
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GdkEventButton *event,
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GtkVScrollbutton *scrollbutton);
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static gint gtk_vscrollbutton_button_release (GtkWidget *widget,
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GdkEventButton *event,
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GtkVScrollbutton *scrollbutton);
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static gint gtk_vscrollbutton_scroll (GtkVScrollbutton *scrollbutton);
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static gboolean gtk_vscrollbutton_timer_1st_time(GtkVScrollbutton *scrollbutton);
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static void gtk_vscrollbutton_add_timer (GtkVScrollbutton *scrollbutton);
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static void gtk_vscrollbutton_remove_timer (GtkVScrollbutton *scrollbutton);
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static gint gtk_real_vscrollbutton_timer (GtkVScrollbutton *scrollbutton);
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static void gtk_vscrollbutton_set_sensitivity (GtkAdjustment *adjustment,
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GtkVScrollbutton *scrollbutton);
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GtkType gtk_vscrollbutton_get_type(void)
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{
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static GtkType vscrollbutton_type = 0;
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if (!vscrollbutton_type) {
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static const GtkTypeInfo vscrollbutton_info = {
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"GtkVScrollbutton",
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sizeof(GtkVScrollbutton),
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sizeof(GtkVScrollbuttonClass),
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(GtkClassInitFunc) gtk_vscrollbutton_class_init,
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(GtkObjectInitFunc) gtk_vscrollbutton_init,
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/* reserved_1 */ NULL,
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/* reserved_2 */ NULL,
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(GtkClassInitFunc) NULL,
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};
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vscrollbutton_type =
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gtk_type_unique(GTK_TYPE_VBOX, &vscrollbutton_info);
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}
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return vscrollbutton_type;
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}
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static void gtk_vscrollbutton_class_init(GtkVScrollbuttonClass *class)
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{
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}
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static void gtk_vscrollbutton_init(GtkVScrollbutton *scrollbutton)
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{
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GtkWidget *arrow;
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scrollbutton->upbutton = gtk_button_new();
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scrollbutton->downbutton = gtk_button_new();
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arrow = gtk_arrow_new(GTK_ARROW_UP, GTK_SHADOW_NONE);
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gtk_widget_show(arrow);
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gtk_container_add(GTK_CONTAINER(scrollbutton->upbutton), arrow);
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gtk_widget_set_usize(scrollbutton->upbutton, -1, 16);
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arrow = gtk_arrow_new(GTK_ARROW_DOWN, GTK_SHADOW_NONE);
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gtk_widget_show(arrow);
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gtk_container_add(GTK_CONTAINER(scrollbutton->downbutton), arrow);
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gtk_widget_set_usize(scrollbutton->downbutton, -1, 16);
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GTK_WIDGET_UNSET_FLAGS(scrollbutton->upbutton, GTK_CAN_FOCUS);
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GTK_WIDGET_UNSET_FLAGS(scrollbutton->downbutton, GTK_CAN_FOCUS);
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gtk_widget_show(scrollbutton->downbutton);
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gtk_widget_show(scrollbutton->upbutton);
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g_signal_connect(G_OBJECT(scrollbutton->upbutton),
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"button_press_event",
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G_CALLBACK(gtk_vscrollbutton_button_press),
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scrollbutton);
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g_signal_connect(G_OBJECT(scrollbutton->downbutton),
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"button_press_event",
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G_CALLBACK(gtk_vscrollbutton_button_press),
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scrollbutton);
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g_signal_connect(G_OBJECT(scrollbutton->upbutton),
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"button_release_event",
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G_CALLBACK
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(gtk_vscrollbutton_button_release), scrollbutton);
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g_signal_connect(G_OBJECT(scrollbutton->downbutton),
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"button_release_event",
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G_CALLBACK
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(gtk_vscrollbutton_button_release), scrollbutton);
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gtk_box_pack_start(GTK_BOX(&scrollbutton->vbox),
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scrollbutton->upbutton, TRUE, TRUE, 0);
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gtk_box_pack_end(GTK_BOX(&scrollbutton->vbox),
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scrollbutton->downbutton, TRUE, TRUE, 0);
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scrollbutton->timer = 0;
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}
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GtkWidget *gtk_vscrollbutton_new(GtkAdjustment *adjustment)
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{
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GtkWidget *vscrollbutton;
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vscrollbutton = GTK_WIDGET(gtk_type_new(gtk_vscrollbutton_get_type()));
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gtk_vscrollbutton_set_adjustment(GTK_VSCROLLBUTTON(vscrollbutton),
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adjustment);
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g_signal_connect(G_OBJECT(GTK_VSCROLLBUTTON(vscrollbutton)->adjustment),
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"value_changed",
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G_CALLBACK
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(gtk_vscrollbutton_set_sensitivity), vscrollbutton);
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g_signal_connect(G_OBJECT(GTK_VSCROLLBUTTON(vscrollbutton)->adjustment),
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"changed",
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G_CALLBACK
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(gtk_vscrollbutton_set_sensitivity), vscrollbutton);
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return vscrollbutton;
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}
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void gtk_vscrollbutton_set_adjustment(GtkVScrollbutton *scrollbutton,
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GtkAdjustment *adjustment)
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{
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g_return_if_fail(scrollbutton != NULL);
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g_return_if_fail(GTK_IS_VSCROLLBUTTON(scrollbutton));
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if (!adjustment)
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adjustment =
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GTK_ADJUSTMENT(gtk_adjustment_new(0.0, 0.0, 0.0, 0.0, 0.0, 0.0));
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else
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g_return_if_fail(GTK_IS_ADJUSTMENT(adjustment));
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if (scrollbutton->adjustment != adjustment) {
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if (scrollbutton->adjustment) {
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g_signal_handlers_disconnect_matched(scrollbutton->adjustment,
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G_SIGNAL_MATCH_DATA,
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0, 0, NULL, NULL,
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(gpointer) scrollbutton);
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g_object_unref(G_OBJECT(scrollbutton->adjustment));
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}
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scrollbutton->adjustment = adjustment;
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g_object_ref(G_OBJECT(adjustment));
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gtk_object_sink(GTK_OBJECT(adjustment));
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}
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}
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static gint gtk_vscrollbutton_button_press(GtkWidget *widget,
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GdkEventButton *event,
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GtkVScrollbutton *scrollbutton)
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{
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if (!GTK_WIDGET_HAS_FOCUS(widget))
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gtk_widget_grab_focus(widget);
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if (scrollbutton->button == 0) {
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gtk_grab_add(widget);
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scrollbutton->button = event->button;
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if (widget == scrollbutton->downbutton)
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scrollbutton->scroll_type = GTK_SCROLL_STEP_FORWARD;
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else
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scrollbutton->scroll_type = GTK_SCROLL_STEP_BACKWARD;
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gtk_vscrollbutton_scroll(scrollbutton);
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gtk_vscrollbutton_add_timer(scrollbutton);
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}
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return TRUE;
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}
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static gint gtk_vscrollbutton_button_release(GtkWidget *widget,
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GdkEventButton *event,
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GtkVScrollbutton *scrollbutton)
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{
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if (!GTK_WIDGET_HAS_FOCUS(widget))
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gtk_widget_grab_focus(widget);
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if (scrollbutton->button == event->button) {
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gtk_grab_remove(widget);
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scrollbutton->button = 0;
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gtk_vscrollbutton_remove_timer(scrollbutton);
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gtk_vscrollbutton_set_sensitivity(scrollbutton->adjustment, scrollbutton);
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}
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return TRUE;
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}
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static gint gtk_vscrollbutton_scroll(GtkVScrollbutton *scrollbutton)
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{
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gfloat new_value;
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gint return_val;
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g_return_val_if_fail(scrollbutton != NULL, FALSE);
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g_return_val_if_fail(GTK_IS_VSCROLLBUTTON(scrollbutton), FALSE);
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new_value = scrollbutton->adjustment->value;
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return_val = TRUE;
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switch (scrollbutton->scroll_type) {
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case GTK_SCROLL_STEP_BACKWARD:
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new_value -= scrollbutton->adjustment->step_increment;
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if (new_value <= scrollbutton->adjustment->lower) {
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new_value = scrollbutton->adjustment->lower;
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return_val = FALSE;
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scrollbutton->timer = 0;
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}
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break;
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case GTK_SCROLL_STEP_FORWARD:
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new_value += scrollbutton->adjustment->step_increment;
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if (new_value >=
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(scrollbutton->adjustment->upper -
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scrollbutton->adjustment->page_size)) {
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new_value =
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scrollbutton->adjustment->upper -
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scrollbutton->adjustment->page_size;
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return_val = FALSE;
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scrollbutton->timer = 0;
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}
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break;
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default:
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break;
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}
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if (new_value != scrollbutton->adjustment->value) {
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scrollbutton->adjustment->value = new_value;
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g_signal_emit_by_name(G_OBJECT
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(scrollbutton->adjustment),
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"value_changed");
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gtk_widget_queue_resize(GTK_WIDGET(scrollbutton)); /* ensure resize */
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}
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return return_val;
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}
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static gboolean
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gtk_vscrollbutton_timer_1st_time(GtkVScrollbutton *scrollbutton)
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{
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/*
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* If the real timeout function succeeds and the timeout is still set,
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* replace it with a quicker one so successive scrolling goes faster.
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*/
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g_object_ref(G_OBJECT(scrollbutton));
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if (scrollbutton->timer) {
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/* We explicitely remove ourselves here in the paranoia
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* that due to things happening above in the callback
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* above, we might have been removed, and another added.
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*/
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g_source_remove(scrollbutton->timer);
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scrollbutton->timer = gtk_timeout_add(SCROLL_LATER_DELAY,
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(GtkFunction)
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gtk_real_vscrollbutton_timer,
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scrollbutton);
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}
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g_object_unref(G_OBJECT(scrollbutton));
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return FALSE; /* don't keep calling this function */
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}
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static void gtk_vscrollbutton_add_timer(GtkVScrollbutton *scrollbutton)
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{
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g_return_if_fail(scrollbutton != NULL);
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g_return_if_fail(GTK_IS_VSCROLLBUTTON(scrollbutton));
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if (!scrollbutton->timer) {
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scrollbutton->need_timer = TRUE;
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scrollbutton->timer = gtk_timeout_add(SCROLL_INITIAL_DELAY,
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(GtkFunction)
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gtk_vscrollbutton_timer_1st_time,
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scrollbutton);
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}
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}
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static void gtk_vscrollbutton_remove_timer(GtkVScrollbutton *scrollbutton)
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{
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g_return_if_fail(scrollbutton != NULL);
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g_return_if_fail(GTK_IS_VSCROLLBUTTON(scrollbutton));
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if (scrollbutton->timer) {
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gtk_timeout_remove(scrollbutton->timer);
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scrollbutton->timer = 0;
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}
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scrollbutton->need_timer = FALSE;
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}
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static gint gtk_real_vscrollbutton_timer(GtkVScrollbutton *scrollbutton)
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{
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gint return_val;
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GDK_THREADS_ENTER();
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return_val = TRUE;
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if (!scrollbutton->timer) {
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return_val = FALSE;
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if (scrollbutton->need_timer)
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scrollbutton->timer =
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gtk_timeout_add(SCROLL_TIMER_LENGTH,
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(GtkFunction) gtk_real_vscrollbutton_timer,
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(gpointer) scrollbutton);
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else {
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GDK_THREADS_LEAVE();
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return FALSE;
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}
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scrollbutton->need_timer = FALSE;
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}
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GDK_THREADS_LEAVE();
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return_val = gtk_vscrollbutton_scroll(scrollbutton);
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return return_val;
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}
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static void gtk_vscrollbutton_set_sensitivity (GtkAdjustment *adjustment,
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GtkVScrollbutton *scrollbutton)
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{
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if (!GTK_WIDGET_REALIZED(GTK_WIDGET(scrollbutton))) return;
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if (scrollbutton->button != 0) return; /* not while something is pressed */
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gtk_widget_set_sensitive(scrollbutton->upbutton,
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(adjustment->value > adjustment->lower));
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gtk_widget_set_sensitive(scrollbutton->downbutton,
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(adjustment->value < (adjustment->upper - adjustment->page_size)));
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}
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