aboutsummaryrefslogtreecommitdiffstats
path: root/widgets/shortcut-bar/e-vscrolled-bar.c
diff options
context:
space:
mode:
Diffstat (limited to 'widgets/shortcut-bar/e-vscrolled-bar.c')
-rw-r--r--widgets/shortcut-bar/e-vscrolled-bar.c652
1 files changed, 652 insertions, 0 deletions
diff --git a/widgets/shortcut-bar/e-vscrolled-bar.c b/widgets/shortcut-bar/e-vscrolled-bar.c
new file mode 100644
index 0000000000..5d5f0ab2e2
--- /dev/null
+++ b/widgets/shortcut-bar/e-vscrolled-bar.c
@@ -0,0 +1,652 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+
+/*
+ * Author :
+ * Damon Chaplin <damon@gtk.org>
+ *
+ * Copyright 1999, Helix Code, Inc.
+ *
+ * This program 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 program 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 program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ */
+
+/*
+ * EVScrolledBar is like GtkScrolledWindow but only scrolls the child widget
+ * vertically. It is intended for scrolling narrow vertical bars.
+ */
+
+#include <gtk/gtkarrow.h>
+#include <gtk/gtkbutton.h>
+#include <gtk/gtksignal.h>
+
+#include "e-vscrolled-bar.h"
+
+/* These are the offsets of the up & down buttons from the right and top/bottom
+ of the widget. */
+#define E_VSCROLLED_BAR_BUTTON_X_OFFSET 2
+#define E_VSCROLLED_BAR_BUTTON_Y_OFFSET 2
+
+/* This is the time between scrolls. */
+#define E_VSCROLLED_BAR_SCROLL_TIMEOUT 20
+
+static void e_vscrolled_bar_class_init (EVScrolledBarClass *class);
+static void e_vscrolled_bar_init (EVScrolledBar *vscrolled_bar);
+static void e_vscrolled_bar_destroy (GtkObject *object);
+static void e_vscrolled_bar_finalize (GtkObject *object);
+static void e_vscrolled_bar_map (GtkWidget *widget);
+static void e_vscrolled_bar_unmap (GtkWidget *widget);
+static void e_vscrolled_bar_size_request (GtkWidget *widget,
+ GtkRequisition *requisition);
+static void e_vscrolled_bar_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation);
+static void e_vscrolled_bar_draw (GtkWidget *widget,
+ GdkRectangle *area);
+static void e_vscrolled_bar_add (GtkContainer *container,
+ GtkWidget *child);
+static void e_vscrolled_bar_remove (GtkContainer *container,
+ GtkWidget *child);
+static void e_vscrolled_bar_forall (GtkContainer *container,
+ gboolean include_internals,
+ GtkCallback callback,
+ gpointer callback_data);
+static void e_vscrolled_bar_adjustment_changed (GtkAdjustment *adjustment,
+ gpointer data);
+static void e_vscrolled_bar_button_pressed (GtkWidget *button,
+ EVScrolledBar *vscrolled_bar);
+static void e_vscrolled_bar_button_released (GtkWidget *button,
+ EVScrolledBar *vscrolled_bar);
+static void e_vscrolled_bar_button_clicked (GtkWidget *button,
+ EVScrolledBar *vscrolled_bar);
+static gboolean e_vscrolled_bar_timeout_handler (gpointer data);
+
+
+static GtkBinClass *parent_class;
+
+
+GtkType
+e_vscrolled_bar_get_type (void)
+{
+ static GtkType e_vscrolled_bar_type = 0;
+
+ if (!e_vscrolled_bar_type) {
+ GtkTypeInfo e_vscrolled_bar_info = {
+ "EVScrolledBar",
+ sizeof (EVScrolledBar),
+ sizeof (EVScrolledBarClass),
+ (GtkClassInitFunc) e_vscrolled_bar_class_init,
+ (GtkObjectInitFunc) e_vscrolled_bar_init,
+ NULL, /* reserved 1 */
+ NULL, /* reserved 2 */
+ (GtkClassInitFunc) NULL
+ };
+
+ parent_class = gtk_type_class (GTK_TYPE_BIN);
+ e_vscrolled_bar_type = gtk_type_unique (GTK_TYPE_BIN,
+ &e_vscrolled_bar_info);
+ }
+
+ return e_vscrolled_bar_type;
+}
+
+
+static void
+e_vscrolled_bar_class_init (EVScrolledBarClass *class)
+{
+ GtkObjectClass *object_class;
+ GtkWidgetClass *widget_class;
+ GtkContainerClass *container_class;
+
+ object_class = (GtkObjectClass *) class;
+ widget_class = (GtkWidgetClass *) class;
+ container_class = (GtkContainerClass *) class;
+
+ /* Method override */
+ object_class->destroy = e_vscrolled_bar_destroy;
+ object_class->finalize = e_vscrolled_bar_finalize;
+
+ widget_class->map = e_vscrolled_bar_map;
+ widget_class->unmap = e_vscrolled_bar_unmap;
+ widget_class->size_request = e_vscrolled_bar_size_request;
+ widget_class->size_allocate = e_vscrolled_bar_size_allocate;
+ widget_class->draw = e_vscrolled_bar_draw;
+
+ container_class->add = e_vscrolled_bar_add;
+ container_class->remove = e_vscrolled_bar_remove;
+ container_class->forall = e_vscrolled_bar_forall;
+}
+
+
+static void
+e_vscrolled_bar_init (EVScrolledBar *vscrolled_bar)
+{
+ GtkWidget *arrow;
+
+ GTK_WIDGET_SET_FLAGS (vscrolled_bar, GTK_NO_WINDOW);
+
+ gtk_container_set_resize_mode (GTK_CONTAINER (vscrolled_bar),
+ GTK_RESIZE_QUEUE);
+
+ gtk_widget_push_composite_child ();
+
+ vscrolled_bar->up_button = gtk_button_new ();
+ gtk_widget_set_composite_name (vscrolled_bar->up_button,
+ "up_button");
+ gtk_widget_set_parent (vscrolled_bar->up_button,
+ GTK_WIDGET (vscrolled_bar));
+ arrow = gtk_arrow_new (GTK_ARROW_UP, GTK_SHADOW_OUT);
+ gtk_misc_set_padding (GTK_MISC (arrow), 1, 1);
+ gtk_widget_show (arrow);
+ gtk_container_add (GTK_CONTAINER (vscrolled_bar->up_button), arrow);
+ gtk_signal_connect_after (GTK_OBJECT (vscrolled_bar->up_button), "pressed", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_pressed), vscrolled_bar);
+ gtk_signal_connect_after (GTK_OBJECT (vscrolled_bar->up_button), "released", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_released), vscrolled_bar);
+ gtk_signal_connect (GTK_OBJECT (vscrolled_bar->up_button), "clicked", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_clicked), vscrolled_bar);
+
+ vscrolled_bar->down_button = gtk_button_new ();
+ gtk_widget_set_composite_name (vscrolled_bar->up_button,
+ "down_button");
+ gtk_widget_set_parent (vscrolled_bar->down_button,
+ GTK_WIDGET (vscrolled_bar));
+ arrow = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_OUT);
+ gtk_misc_set_padding (GTK_MISC (arrow), 1, 1);
+ gtk_widget_show (arrow);
+ gtk_container_add (GTK_CONTAINER (vscrolled_bar->down_button), arrow);
+ gtk_signal_connect_after (GTK_OBJECT (vscrolled_bar->down_button), "pressed", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_pressed), vscrolled_bar);
+ gtk_signal_connect_after (GTK_OBJECT (vscrolled_bar->down_button), "released", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_released), vscrolled_bar);
+ gtk_signal_connect (GTK_OBJECT (vscrolled_bar->down_button), "clicked", GTK_SIGNAL_FUNC (e_vscrolled_bar_button_clicked), vscrolled_bar);
+
+ gtk_widget_pop_composite_child ();
+
+ vscrolled_bar->adjustment = NULL;
+ vscrolled_bar->timeout_id = 0;
+ vscrolled_bar->scrolling_up = FALSE;
+ vscrolled_bar->min_distance = -1.0;
+ vscrolled_bar->button_pressed = FALSE;
+}
+
+
+/**
+ * e_vscrolled_bar_new:
+ *
+ * @adjustment: The #GtkAdjustment to use for scrolling, or NULL.
+ * @Return: A new #EVScrolledBar.
+ *
+ * Creates a new #EVScrolledBar with the given adjustment.
+ **/
+GtkWidget *
+e_vscrolled_bar_new (GtkAdjustment *adjustment)
+{
+ GtkWidget *vscrolled_bar;
+
+ vscrolled_bar = GTK_WIDGET (gtk_type_new (e_vscrolled_bar_get_type ()));
+ e_vscrolled_bar_set_adjustment (E_VSCROLLED_BAR (vscrolled_bar),
+ adjustment);
+
+ return vscrolled_bar;
+}
+
+
+static void
+e_vscrolled_bar_destroy (GtkObject *object)
+{
+ EVScrolledBar *vscrolled_bar;
+
+ vscrolled_bar = E_VSCROLLED_BAR (object);
+
+ if (vscrolled_bar->timeout_id) {
+ g_source_remove (vscrolled_bar->timeout_id);
+ vscrolled_bar->timeout_id = 0;
+ }
+
+ gtk_widget_unparent (vscrolled_bar->up_button);
+ gtk_widget_unparent (vscrolled_bar->down_button);
+
+ GTK_OBJECT_CLASS (parent_class)->destroy (object);
+}
+
+
+static void
+e_vscrolled_bar_finalize (GtkObject *object)
+{
+ EVScrolledBar *vscrolled_bar;
+
+ vscrolled_bar = E_VSCROLLED_BAR (object);
+
+ gtk_object_unref (GTK_OBJECT (vscrolled_bar->adjustment));
+
+ GTK_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+
+static void
+e_vscrolled_bar_map (GtkWidget *widget)
+{
+ EVScrolledBar *vscrolled_bar;
+
+ g_return_if_fail (widget != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
+
+ vscrolled_bar = E_VSCROLLED_BAR (widget);
+
+ /* chain parent class handler to map self and child */
+ GTK_WIDGET_CLASS (parent_class)->map (widget);
+
+ if (GTK_WIDGET_VISIBLE (vscrolled_bar->up_button) &&
+ !GTK_WIDGET_MAPPED (vscrolled_bar->up_button))
+ gtk_widget_map (vscrolled_bar->up_button);
+
+ if (GTK_WIDGET_VISIBLE (vscrolled_bar->down_button) &&
+ !GTK_WIDGET_MAPPED (vscrolled_bar->down_button))
+ gtk_widget_map (vscrolled_bar->down_button);
+}
+
+
+static void
+e_vscrolled_bar_unmap (GtkWidget *widget)
+{
+ EVScrolledBar *vscrolled_bar;
+
+ g_return_if_fail (widget != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
+
+ vscrolled_bar = E_VSCROLLED_BAR (widget);
+
+ /* chain parent class handler to unmap self and child */
+ GTK_WIDGET_CLASS (parent_class)->unmap (widget);
+
+ if (GTK_WIDGET_MAPPED (vscrolled_bar->up_button))
+ gtk_widget_unmap (vscrolled_bar->up_button);
+
+ if (GTK_WIDGET_MAPPED (vscrolled_bar->down_button))
+ gtk_widget_unmap (vscrolled_bar->down_button);
+}
+
+
+static void
+e_vscrolled_bar_size_request (GtkWidget *widget,
+ GtkRequisition *requisition)
+{
+ EVScrolledBar *vscrolled_bar;
+ GtkBin *bin;
+ GtkRequisition child_requisition;
+
+ g_return_if_fail (widget != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
+ g_return_if_fail (requisition != NULL);
+
+ vscrolled_bar = E_VSCROLLED_BAR (widget);
+ bin = GTK_BIN (widget);
+
+ requisition->width = 0;
+ requisition->height = 0;
+
+ /* We just return the requisition of the child widget, plus the
+ border width. */
+ if (bin->child && GTK_WIDGET_VISIBLE (bin->child)) {
+ gtk_widget_size_request (bin->child, &child_requisition);
+ *requisition = child_requisition;
+ }
+
+ /* We remember the requested heights of the up & down buttons. */
+ gtk_widget_size_request (vscrolled_bar->up_button,
+ &child_requisition);
+ vscrolled_bar->up_button_width = child_requisition.width;
+ vscrolled_bar->up_button_height = child_requisition.height;
+
+ gtk_widget_size_request (vscrolled_bar->down_button,
+ &child_requisition);
+ vscrolled_bar->down_button_width = child_requisition.width;
+ vscrolled_bar->down_button_height = child_requisition.height;
+
+ /* Add on the standard container border widths. */
+ requisition->width += GTK_CONTAINER (widget)->border_width * 2;
+ requisition->height += GTK_CONTAINER (widget)->border_width * 2;
+}
+
+
+static void
+e_vscrolled_bar_size_allocate (GtkWidget *widget,
+ GtkAllocation *allocation)
+{
+ EVScrolledBar *vscrolled_bar;
+ GtkBin *bin;
+ GtkAllocation button_allocation, child_allocation;
+ gint border_width;
+
+ g_return_if_fail (widget != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
+ g_return_if_fail (allocation != NULL);
+
+ vscrolled_bar = E_VSCROLLED_BAR (widget);
+ bin = GTK_BIN (widget);
+
+ widget->allocation = *allocation;
+
+ border_width = GTK_CONTAINER (widget)->border_width;
+
+ child_allocation.x = border_width;
+ child_allocation.y = border_width;
+ child_allocation.width = allocation->width - 2 * border_width;
+ child_allocation.height = allocation->height - 2 * border_width;
+ gtk_widget_size_allocate (bin->child, &child_allocation);
+
+ button_allocation.x = allocation->width - border_width
+ - vscrolled_bar->up_button_width
+ - E_VSCROLLED_BAR_BUTTON_X_OFFSET;
+ button_allocation.y = border_width + E_VSCROLLED_BAR_BUTTON_Y_OFFSET;
+ button_allocation.width = vscrolled_bar->up_button_width;
+ button_allocation.height = vscrolled_bar->up_button_height;
+ gtk_widget_size_allocate (vscrolled_bar->up_button,
+ &button_allocation);
+
+ button_allocation.x = allocation->width - border_width
+ - vscrolled_bar->down_button_width
+ - E_VSCROLLED_BAR_BUTTON_X_OFFSET;
+ button_allocation.y = allocation->height - border_width
+ - vscrolled_bar->down_button_height
+ - E_VSCROLLED_BAR_BUTTON_Y_OFFSET;
+ button_allocation.width = vscrolled_bar->down_button_width;
+ button_allocation.height = vscrolled_bar->down_button_height;
+ gtk_widget_size_allocate (vscrolled_bar->down_button,
+ &button_allocation);
+}
+
+
+static void
+e_vscrolled_bar_draw (GtkWidget *widget,
+ GdkRectangle *area)
+{
+ EVScrolledBar *vscrolled_bar;
+ GtkBin *bin;
+ GdkRectangle child_area;
+
+ g_return_if_fail (widget != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (widget));
+ g_return_if_fail (area != NULL);
+
+ vscrolled_bar = E_VSCROLLED_BAR (widget);
+ bin = GTK_BIN (widget);
+
+ if (bin->child && GTK_WIDGET_VISIBLE (bin->child) &&
+ gtk_widget_intersect (bin->child, area, &child_area))
+ gtk_widget_draw (bin->child, &child_area);
+
+ if (GTK_WIDGET_VISIBLE (vscrolled_bar->up_button) &&
+ gtk_widget_intersect (vscrolled_bar->up_button, area, &child_area))
+ gtk_widget_draw (vscrolled_bar->up_button, &child_area);
+
+ if (GTK_WIDGET_VISIBLE (vscrolled_bar->down_button) &&
+ gtk_widget_intersect (vscrolled_bar->down_button, area, &child_area))
+ gtk_widget_draw (vscrolled_bar->down_button, &child_area);
+}
+
+
+static void
+e_vscrolled_bar_add (GtkContainer *container,
+ GtkWidget *child)
+{
+ EVScrolledBar *vscrolled_bar;
+ GtkBin *bin;
+
+ g_return_if_fail (container != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (container));
+
+ vscrolled_bar = E_VSCROLLED_BAR (container);
+ bin = GTK_BIN (container);
+
+ g_return_if_fail (bin->child == NULL);
+
+ bin->child = child;
+ gtk_widget_set_parent (child, GTK_WIDGET (bin));
+
+ gtk_widget_set_scroll_adjustments (child, NULL,
+ vscrolled_bar->adjustment);
+
+ if (GTK_WIDGET_REALIZED (child->parent))
+ gtk_widget_realize (child);
+
+ if (GTK_WIDGET_VISIBLE (child->parent) && GTK_WIDGET_VISIBLE (child)) {
+ if (GTK_WIDGET_MAPPED (child->parent))
+ gtk_widget_map (child);
+
+ gtk_widget_queue_resize (child);
+ }
+}
+
+
+static void
+e_vscrolled_bar_remove (GtkContainer *container,
+ GtkWidget *child)
+{
+ g_return_if_fail (container != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (container));
+ g_return_if_fail (child != NULL);
+ g_return_if_fail (GTK_BIN (container)->child == child);
+
+ gtk_widget_set_scroll_adjustments (child, NULL, NULL);
+
+ /* chain parent class handler to remove child */
+ GTK_CONTAINER_CLASS (parent_class)->remove (container, child);
+}
+
+
+static void
+e_vscrolled_bar_forall (GtkContainer *container,
+ gboolean include_internals,
+ GtkCallback callback,
+ gpointer callback_data)
+{
+ g_return_if_fail (container != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (container));
+ g_return_if_fail (callback != NULL);
+
+ GTK_CONTAINER_CLASS (parent_class)->forall (container,
+ include_internals,
+ callback,
+ callback_data);
+ if (include_internals) {
+ EVScrolledBar *vscrolled_bar;
+
+ vscrolled_bar = E_VSCROLLED_BAR (container);
+
+ if (vscrolled_bar->up_button)
+ callback (vscrolled_bar->up_button, callback_data);
+ if (vscrolled_bar->down_button)
+ callback (vscrolled_bar->down_button, callback_data);
+ }
+}
+
+
+/**
+ * e_vscrolled_bar_get_adjustment:
+ *
+ * @vscrolled_bar: An #EVScrolledBar.
+ * @Return: The #GtkAdjustment used for scrolling @vscrolled_bar.
+ *
+ * Returns the #GtkAdjustment used for scrolling the #EVscrolledBar.
+ **/
+GtkAdjustment*
+e_vscrolled_bar_get_adjustment (EVScrolledBar *vscrolled_bar)
+{
+ g_return_val_if_fail (vscrolled_bar != NULL, NULL);
+ g_return_val_if_fail (E_IS_VSCROLLED_BAR (vscrolled_bar), NULL);
+
+ return vscrolled_bar->adjustment;
+}
+
+
+/**
+ * e_vscrolled_bar_set_adjustment:
+ *
+ * @vscrolled_bar: An #EVScrolledBar.
+ * @adjustment: The #GtkAdjustment to use for scrolling @vscrolled_bar.
+ *
+ * Sets the #GtkAdjustment to use for scrolling the #EVscrolledBar.
+ **/
+void
+e_vscrolled_bar_set_adjustment (EVScrolledBar *vscrolled_bar,
+ GtkAdjustment *adjustment)
+{
+ g_return_if_fail (vscrolled_bar != NULL);
+ g_return_if_fail (E_IS_VSCROLLED_BAR (vscrolled_bar));
+
+ if (adjustment)
+ g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
+ else
+ adjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);
+
+ if (vscrolled_bar->adjustment == adjustment)
+ return;
+
+ if (vscrolled_bar->adjustment) {
+ gtk_signal_disconnect_by_func (GTK_OBJECT (vscrolled_bar->adjustment),
+ GTK_SIGNAL_FUNC (e_vscrolled_bar_adjustment_changed),
+ vscrolled_bar);
+ gtk_object_unref (GTK_OBJECT (vscrolled_bar->adjustment));
+ }
+
+ vscrolled_bar->adjustment = adjustment;
+ gtk_object_ref (GTK_OBJECT (vscrolled_bar->adjustment));
+ gtk_object_sink (GTK_OBJECT (vscrolled_bar->adjustment));
+
+ /* I've used connect_after here to avoid a problem when using a
+ GnomeCanvas as the child widget. When just using connect it would
+ leave a blank space when one of the buttons is hidden. We want
+ the GtkLayout to handle the scrolling before we hide any buttons. */
+ gtk_signal_connect_after (GTK_OBJECT (adjustment), "changed",
+ GTK_SIGNAL_FUNC (e_vscrolled_bar_adjustment_changed),
+ vscrolled_bar);
+ gtk_signal_connect_after (GTK_OBJECT (adjustment), "value_changed",
+ GTK_SIGNAL_FUNC (e_vscrolled_bar_adjustment_changed),
+ vscrolled_bar);
+
+ e_vscrolled_bar_adjustment_changed (adjustment, vscrolled_bar);
+
+ if (GTK_BIN (vscrolled_bar)->child)
+ gtk_widget_set_scroll_adjustments (GTK_BIN (vscrolled_bar)->child, NULL, adjustment);
+}
+
+
+static void
+e_vscrolled_bar_adjustment_changed (GtkAdjustment *adjustment,
+ gpointer data)
+{
+ EVScrolledBar *vscrolled_bar;
+
+ g_return_if_fail (adjustment != NULL);
+ g_return_if_fail (data != NULL);
+
+ vscrolled_bar = E_VSCROLLED_BAR (data);
+
+ /* If the adjustment value is not 0, show the up button. */
+ if (adjustment->value != 0)
+ gtk_widget_show (vscrolled_bar->up_button);
+ else
+ gtk_widget_hide (vscrolled_bar->up_button);
+
+ /* If the adjustment value is less than the maximum value, show the
+ down button. */
+ if (adjustment->value < adjustment->upper - adjustment->page_size)
+ gtk_widget_show (vscrolled_bar->down_button);
+ else
+ gtk_widget_hide (vscrolled_bar->down_button);
+}
+
+
+static void
+e_vscrolled_bar_button_pressed (GtkWidget *button,
+ EVScrolledBar *vscrolled_bar)
+{
+ if (vscrolled_bar->timeout_id != 0)
+ g_source_remove (vscrolled_bar->timeout_id);
+
+ vscrolled_bar->timeout_id = g_timeout_add (E_VSCROLLED_BAR_SCROLL_TIMEOUT, e_vscrolled_bar_timeout_handler, vscrolled_bar);
+ vscrolled_bar->scrolling_up = (button == vscrolled_bar->up_button) ? TRUE : FALSE;
+ vscrolled_bar->min_distance = vscrolled_bar->adjustment->page_size / 4;
+ vscrolled_bar->button_pressed = TRUE;
+
+ e_vscrolled_bar_timeout_handler (vscrolled_bar);
+}
+
+
+static void
+e_vscrolled_bar_button_released (GtkWidget *button,
+ EVScrolledBar *vscrolled_bar)
+{
+ vscrolled_bar->button_pressed = FALSE;
+}
+
+
+/* This will be called when the user hits the space key to activate the button.
+ It will also be called just before button_released() is called, but since
+ we already handle that we simply return if the button is pressed. */
+static void
+e_vscrolled_bar_button_clicked (GtkWidget *button,
+ EVScrolledBar *vscrolled_bar)
+{
+ if (vscrolled_bar->button_pressed)
+ return;
+
+ /* We act as if the button is pressed and released immediately. */
+ e_vscrolled_bar_button_pressed (button, vscrolled_bar);
+ vscrolled_bar->button_pressed = FALSE;
+}
+
+
+static gboolean
+e_vscrolled_bar_timeout_handler (gpointer data)
+{
+ EVScrolledBar *vscrolled_bar;
+ GtkAdjustment *adjustment;
+ gfloat new_value;
+ gboolean retval = TRUE;
+
+ vscrolled_bar = E_VSCROLLED_BAR (data);
+ adjustment = vscrolled_bar->adjustment;
+
+ GDK_THREADS_ENTER ();
+
+ /* Check if the user has released the button and we have already
+ scrolled the minimum distance. */
+ if (vscrolled_bar->button_pressed == FALSE
+ && vscrolled_bar->min_distance <= 0) {
+ GDK_THREADS_LEAVE ();
+ return FALSE;
+ }
+
+ vscrolled_bar->min_distance -= adjustment->step_increment;
+
+ if (vscrolled_bar->scrolling_up) {
+ new_value = adjustment->value - adjustment->step_increment;
+ if (new_value <= adjustment->lower) {
+ new_value = adjustment->lower;
+ retval = FALSE;
+ }
+ } else {
+ new_value = adjustment->value + adjustment->step_increment;
+ if (new_value >= adjustment->upper - adjustment->page_size) {
+ new_value = adjustment->upper - adjustment->page_size;
+ retval = FALSE;
+ }
+ }
+
+ if (adjustment->value != new_value) {
+ adjustment->value = new_value;
+ gtk_signal_emit_by_name (GTK_OBJECT (adjustment),
+ "value_changed");
+ }
+
+ GDK_THREADS_LEAVE ();
+ return retval;
+}
generated by cgit (git 2.34.1) at 2024-12-17 03:49:02 +0800