/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-1999. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
/* EScrollFrame based on GtkScrolledWindow.
*
* Modifications by Federico Mena <federico@helixcode.com>
*/
#include <config.h>
#include <gtk/gtkhscrollbar.h>
#include <gtk/gtkvscrollbar.h>
#include <gtk/gtksignal.h>
#include <gtk/gtkviewport.h>
#include "e-scroll-frame.h"
/* scrolled window policy and size requisition handling:
*
* gtk size requisition works as follows:
* a widget upon size-request reports the width and height that it finds
* to be best suited to display its contents, including children.
* the width and/or height reported from a widget upon size requisition
* may be overidden by the user by specifying a width and/or height
* other than 0 through gtk_widget_set_usize().
*
* a scrolled window needs (for imlementing all three policy types) to
* request its width and height based on two different rationales.
* 1) the user wants the scrolled window to just fit into the space
* that it gets allocated for a specifc dimension.
* 1.1) this does not apply if the user specified a concrete value
* value for that specific dimension by either specifying usize for the
* scrolled window or for its child.
* 2) the user wants the scrolled window to take as much space up as
* is desired by the child for a specifc dimension (i.e. POLICY_NEVER).
*
* also, kinda obvious:
* 3) a user would certainly not have choosen a scrolled window as a container
* for the child, if the resulting allocation takes up more space than the
* child would have allocated without the scrolled window.
*
* conclusions:
* A) from 1) follows: the scrolled window shouldn't request more space for a
* specifc dimension than is required at minimum.
* B) from 1.1) follows: the requisition may be overidden by usize of the scrolled
* window (done automatically) or by usize of the child (needs to be checked).
* C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the
* child's dimension.
* D) from 3) follows: the scrolled window child's minimum width and minimum height
* under A) at least correspond to the space taken up by its scrollbars.
*/
/* Object argument IDs */
enum {
ARG_0,
ARG_HADJUSTMENT,
ARG_VADJUSTMENT,
ARG_HSCROLLBAR_POLICY,
ARG_VSCROLLBAR_POLICY,
ARG_FRAME_PLACEMENT,
ARG_SHADOW_TYPE,
ARG_SCROLLBAR_SPACING
};
/* Private part of the EScrollFrame structure */
typedef struct {
/* Horizontal and vertical scrollbars */
GtkWidget *hsb;
GtkWidget *vsb;
/* Space between scrollbars and frame */
guint sb_spacing;
/* Allocation for frame */
guint frame_x;
guint frame_y;
guint frame_w;
guint frame_h;
/* Scrollbar policy */
guint hsb_policy : 2;
guint vsb_policy : 2;
/* Whether scrollbars are visible */
guint hsb_visible : 1;
guint vsb_visible : 1;
/* Placement of frame wrt scrollbars */
guint frame_placement : 2;
/* Shadow type for frame */
guint shadow_type : 3;
} ScrollFramePrivate;
static void e_scroll_frame_class_init (EScrollFrameClass *class);
static void e_scroll_frame_init (EScrollFrame *sf);
static void e_scroll_frame_set_arg (GtkObject *object, GtkArg *arg, guint arg_id);
static void e_scroll_frame_get_arg (GtkObject *object, GtkArg *arg, guint arg_id);
static void e_scroll_frame_destroy (GtkObject *object);
static void e_scroll_frame_finalize (GtkObject *object);
static void e_scroll_frame_map (GtkWidget *widget);
static void e_scroll_frame_unmap (GtkWidget *widget);
static void e_scroll_frame_draw (GtkWidget *widget, GdkRectangle *area);
static void e_scroll_frame_size_request (GtkWidget *widget, GtkRequisition *requisition);
static void e_scroll_frame_size_allocate (GtkWidget *widget, GtkAllocation *allocation);
static gint e_scroll_frame_expose (GtkWidget *widget, GdkEventExpose *event);
static gint e_scroll_frame_button_press (GtkWidget *widget, GdkEventButton *event);
static void e_scroll_frame_add (GtkContainer *container, GtkWidget *widget);
static void e_scroll_frame_remove (GtkContainer *container, GtkWidget *widget);
static void e_scroll_frame_forall (GtkContainer *container, gboolean include_internals,
GtkCallback callback, gpointer callback_data);
static GtkBinClass *parent_class;
/**
* e_scroll_frame_get_type:
* @void:
*
* Registers the #EScrollFrame class if necessary, and returns the type ID
* associated to it.
*
* Return value: The type ID of the #EScrollFrame class.
**/
GtkType
e_scroll_frame_get_type (void)
{
static GtkType scroll_frame_type = 0;
if (!scroll_frame_type) {
static const GtkTypeInfo scroll_frame_info = {
"EScrollFrame",
sizeof (EScrollFrame),
sizeof (EScrollFrameClass),
(GtkClassInitFunc) e_scroll_frame_class_init,
(GtkObjectInitFunc) e_scroll_frame_init,
NULL, /* reserved_1 */
NULL, /* reserved_2 */
(GtkClassInitFunc) NULL
};
scroll_frame_type = gtk_type_unique (GTK_TYPE_BIN, &scroll_frame_info);
}
return scroll_frame_type;
}
/* Class initialization function for the scroll frame widget */
static void
e_scroll_frame_class_init (EScrollFrameClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
object_class = (GtkObjectClass *) class;
widget_class = (GtkWidgetClass *) class;
container_class = (GtkContainerClass *) class;
parent_class = gtk_type_class (GTK_TYPE_BIN);
gtk_object_add_arg_type ("EScrollFrame::hadjustment",
GTK_TYPE_ADJUSTMENT,
GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
ARG_HADJUSTMENT);
gtk_object_add_arg_type ("EScrollFrame::vadjustment",
GTK_TYPE_ADJUSTMENT,
GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
ARG_VADJUSTMENT);
gtk_object_add_arg_type ("EScrollFrame::hscrollbar_policy",
GTK_TYPE_POLICY_TYPE,
GTK_ARG_READWRITE,
ARG_HSCROLLBAR_POLICY);
gtk_object_add_arg_type ("EScrollFrame::vscrollbar_policy",
GTK_TYPE_POLICY_TYPE,
GTK_ARG_READWRITE,
ARG_VSCROLLBAR_POLICY);
gtk_object_add_arg_type ("EScrollFrame::frame_placement",
GTK_TYPE_CORNER_TYPE,
GTK_ARG_READWRITE,
ARG_FRAME_PLACEMENT);
gtk_object_add_arg_type ("EScrollFrame::shadow_type",
GTK_TYPE_SHADOW_TYPE,
GTK_ARG_READWRITE,
ARG_SHADOW_TYPE);
gtk_object_add_arg_type ("EScrollFrame::scrollbar_spacing",
GTK_TYPE_UINT,
GTK_ARG_READWRITE,
ARG_SCROLLBAR_SPACING);
object_class->set_arg = e_scroll_frame_set_arg;
object_class->get_arg = e_scroll_frame_get_arg;
object_class->destroy = e_scroll_frame_destroy;
object_class->finalize = e_scroll_frame_finalize;
widget_class->map = e_scroll_frame_map;
widget_class->unmap = e_scroll_frame_unmap;
widget_class->draw = e_scroll_frame_draw;
widget_class->size_request = e_scroll_frame_size_request;
widget_class->size_allocate = e_scroll_frame_size_allocate;
widget_class->expose_event = e_scroll_frame_expose;
widget_class->button_press_event = e_scroll_frame_button_press;
container_class->add = e_scroll_frame_add;
container_class->remove = e_scroll_frame_remove;
container_class->forall = e_scroll_frame_forall;
}
/* Object initialization function for the scroll frame widget */
static void
e_scroll_frame_init (EScrollFrame *sf)
{
ScrollFramePrivate *priv;
priv = g_new0 (ScrollFramePrivate, 1);
sf->priv = priv;
GTK_WIDGET_SET_FLAGS (sf, GTK_NO_WINDOW);
gtk_container_set_resize_mode (GTK_CONTAINER (sf), GTK_RESIZE_QUEUE);
priv->sb_spacing = 3;
priv->hsb_policy = GTK_POLICY_ALWAYS;
priv->vsb_policy = GTK_POLICY_ALWAYS;
priv->frame_placement = GTK_CORNER_TOP_LEFT;
priv->shadow_type = GTK_SHADOW_NONE;
}
/* Set_arg handler for the scroll frame widget */
static void
e_scroll_frame_set_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
sf = E_SCROLL_FRAME (object);
priv = sf->priv;
switch (arg_id) {
case ARG_HADJUSTMENT:
e_scroll_frame_set_hadjustment (sf, GTK_VALUE_POINTER (*arg));
break;
case ARG_VADJUSTMENT:
e_scroll_frame_set_vadjustment (sf, GTK_VALUE_POINTER (*arg));
break;
case ARG_HSCROLLBAR_POLICY:
e_scroll_frame_set_policy (sf, GTK_VALUE_ENUM (*arg), priv->vsb_policy);
break;
case ARG_VSCROLLBAR_POLICY:
e_scroll_frame_set_policy (sf, priv->hsb_policy, GTK_VALUE_ENUM (*arg));
break;
case ARG_FRAME_PLACEMENT:
e_scroll_frame_set_placement (sf, GTK_VALUE_ENUM (*arg));
break;
case ARG_SHADOW_TYPE:
e_scroll_frame_set_shadow_type (sf, GTK_VALUE_ENUM (*arg));
break;
case ARG_SCROLLBAR_SPACING:
e_scroll_frame_set_scrollbar_spacing (sf, GTK_VALUE_UINT (*arg));
break;
default:
break;
}
}
/* Get_arg handler for the scroll frame widget */
static void
e_scroll_frame_get_arg (GtkObject *object, GtkArg *arg, guint arg_id)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
sf = E_SCROLL_FRAME (object);
priv = sf->priv;
switch (arg_id) {
case ARG_HADJUSTMENT:
GTK_VALUE_POINTER (*arg) = e_scroll_frame_get_hadjustment (sf);
break;
case ARG_VADJUSTMENT:
GTK_VALUE_POINTER (*arg) = e_scroll_frame_get_vadjustment (sf);
break;
case ARG_HSCROLLBAR_POLICY:
GTK_VALUE_ENUM (*arg) = priv->hsb_policy;
break;
case ARG_VSCROLLBAR_POLICY:
GTK_VALUE_ENUM (*arg) = priv->vsb_policy;
break;
case ARG_FRAME_PLACEMENT:
GTK_VALUE_ENUM (*arg) = priv->frame_placement;
break;
case ARG_SHADOW_TYPE:
GTK_VALUE_ENUM (*arg) = priv->shadow_type;
break;
case ARG_SCROLLBAR_SPACING:
GTK_VALUE_UINT (*arg) = priv->sb_spacing;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
/* Destroy handler for the scroll frame widget */
static void
e_scroll_frame_destroy (GtkObject *object)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
g_return_if_fail (object != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (object));
sf = E_SCROLL_FRAME (object);
priv = sf->priv;
gtk_widget_unparent (priv->hsb);
gtk_widget_unparent (priv->vsb);
gtk_widget_destroy (priv->hsb);
gtk_widget_destroy (priv->vsb);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
/* Finalize handler for the scroll frame widget */
static void
e_scroll_frame_finalize (GtkObject *object)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
sf = E_SCROLL_FRAME (object);
priv = sf->priv;
gtk_widget_unref (priv->hsb);
gtk_widget_unref (priv->vsb);
g_free (priv);
if (GTK_OBJECT_CLASS (parent_class)->finalize)
(* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
}
/* Map handler for the scroll frame widget */
static void
e_scroll_frame_map (GtkWidget *widget)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (widget));
sf = E_SCROLL_FRAME (widget);
priv = sf->priv;
/* chain parent class handler to map self and child */
if (GTK_WIDGET_CLASS (parent_class)->map)
(* GTK_WIDGET_CLASS (parent_class)->map) (widget);
if (GTK_WIDGET_VISIBLE (priv->hsb) && !GTK_WIDGET_MAPPED (priv->hsb))
gtk_widget_map (priv->hsb);
if (GTK_WIDGET_VISIBLE (priv->vsb) && !GTK_WIDGET_MAPPED (priv->vsb))
gtk_widget_map (priv->vsb);
}
/* Unmap handler for the scroll frame widget */
static void
e_scroll_frame_unmap (GtkWidget *widget)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (widget));
sf = E_SCROLL_FRAME (widget);
priv = sf->priv;
/* chain parent class handler to unmap self and child */
if (GTK_WIDGET_CLASS (parent_class)->unmap)
(* GTK_WIDGET_CLASS (parent_class)->unmap) (widget);
if (GTK_WIDGET_MAPPED (priv->hsb))
gtk_widget_unmap (priv->hsb);
if (GTK_WIDGET_MAPPED (priv->vsb))
gtk_widget_unmap (priv->vsb);
}
/* Draws the shadow of a scroll frame widget */
static void
draw_shadow (EScrollFrame *sf, GdkRectangle *area)
{
ScrollFramePrivate *priv;
g_assert (area != NULL);
priv = sf->priv;
gtk_paint_shadow (GTK_WIDGET (sf)->style,
GTK_WIDGET (sf)->window,
GTK_STATE_NORMAL, priv->shadow_type,
area, GTK_WIDGET (sf),
"scroll_frame",
priv->frame_x, priv->frame_y,
priv->frame_w, priv->frame_h);
}
/* Draw handler for the scroll frame widget */
static void
e_scroll_frame_draw (GtkWidget *widget, GdkRectangle *area)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
GtkBin *bin;
GdkRectangle child_area;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (widget));
g_return_if_fail (area != NULL);
sf = E_SCROLL_FRAME (widget);
priv = sf->priv;
bin = GTK_BIN (widget);
if (GTK_WIDGET_DRAWABLE (widget))
draw_shadow (sf, area);
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 (priv->hsb)
&& gtk_widget_intersect (priv->hsb, area, &child_area))
gtk_widget_draw (priv->hsb, &child_area);
if (GTK_WIDGET_VISIBLE (priv->vsb)
&& gtk_widget_intersect (priv->vsb, area, &child_area))
gtk_widget_draw (priv->vsb, &child_area);
}
/* Forall handler for the scroll frame widget */
static void
e_scroll_frame_forall (GtkContainer *container, gboolean include_internals,
GtkCallback callback, gpointer callback_data)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
g_return_if_fail (container != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (container));
g_return_if_fail (callback != NULL);
sf = E_SCROLL_FRAME (container);
priv = sf->priv;
if (GTK_CONTAINER_CLASS (parent_class)->forall)
(* GTK_CONTAINER_CLASS (parent_class)->forall) (
container, include_internals,
callback, callback_data);
if (include_internals) {
if (priv->vsb)
(* callback) (priv->vsb, callback_data);
if (priv->hsb)
(* callback) (priv->hsb, callback_data);
}
}
/* Size_request handler for the scroll frame widget */
static void
e_scroll_frame_size_request (GtkWidget *widget, GtkRequisition *requisition)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
GtkBin *bin;
gint extra_width;
gint extra_height;
GtkRequisition hsb_requisition;
GtkRequisition vsb_requisition;
GtkRequisition child_requisition;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (widget));
g_return_if_fail (requisition != NULL);
sf = E_SCROLL_FRAME (widget);
priv = sf->priv;
bin = GTK_BIN (widget);
extra_width = 0;
extra_height = 0;
requisition->width = GTK_CONTAINER (widget)->border_width * 2;
requisition->height = GTK_CONTAINER (widget)->border_width * 2;
if (priv->shadow_type != GTK_SHADOW_NONE) {
requisition->width += 2 * widget->style->klass->xthickness;
requisition->height += 2 * widget->style->klass->ythickness;
}
gtk_widget_size_request (priv->hsb, &hsb_requisition);
gtk_widget_size_request (priv->vsb, &vsb_requisition);
if (bin->child && GTK_WIDGET_VISIBLE (bin->child)) {
static guint quark_aux_info;
if (!quark_aux_info)
quark_aux_info = g_quark_from_static_string ("gtk-aux-info");
gtk_widget_size_request (bin->child, &child_requisition);
if (priv->hsb_policy == GTK_POLICY_NEVER)
requisition->width += child_requisition.width;
else {
GtkWidgetAuxInfo *aux_info;
aux_info = gtk_object_get_data_by_id (GTK_OBJECT (bin->child),
quark_aux_info);
if (aux_info && aux_info->width > 0) {
requisition->width += aux_info->width;
extra_width = -1;
} else
requisition->width += vsb_requisition.width;
}
if (priv->vsb_policy == GTK_POLICY_NEVER)
requisition->height += child_requisition.height;
else {
GtkWidgetAuxInfo *aux_info;
aux_info = gtk_object_get_data_by_id (GTK_OBJECT (bin->child),
quark_aux_info);
if (aux_info && aux_info->height > 0) {
requisition->height += aux_info->height;
extra_height = -1;
} else
requisition->height += hsb_requisition.height;
}
}
if (priv->hsb_policy == GTK_POLICY_AUTOMATIC || GTK_WIDGET_VISIBLE (priv->hsb)) {
requisition->width = MAX (requisition->width, hsb_requisition.width);
if (!extra_height || GTK_WIDGET_VISIBLE (priv->hsb))
extra_height = priv->sb_spacing + hsb_requisition.height;
}
if (priv->vsb_policy == GTK_POLICY_AUTOMATIC || GTK_WIDGET_VISIBLE (priv->vsb)) {
requisition->height = MAX (requisition->height, vsb_requisition.height);
if (!extra_width || GTK_WIDGET_VISIBLE (priv->vsb))
extra_width = priv->sb_spacing + vsb_requisition.width;
}
requisition->width += MAX (0, extra_width);
requisition->height += MAX (0, extra_height);
}
/* Computes the relative allocation for the scroll frame widget */
static void
compute_relative_allocation (GtkWidget *widget, GtkAllocation *allocation)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
g_assert (widget != NULL);
g_assert (E_IS_SCROLL_FRAME (widget));
g_assert (allocation != NULL);
sf = E_SCROLL_FRAME (widget);
priv = sf->priv;
allocation->x = GTK_CONTAINER (widget)->border_width;
allocation->y = GTK_CONTAINER (widget)->border_width;
allocation->width = MAX (1, (gint) widget->allocation.width - allocation->x * 2);
allocation->height = MAX (1, (gint) widget->allocation.height - allocation->y * 2);
if (priv->vsb_visible) {
GtkRequisition vsb_requisition;
gtk_widget_get_child_requisition (priv->vsb, &vsb_requisition);
if (priv->frame_placement == GTK_CORNER_TOP_RIGHT
|| priv->frame_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->x += vsb_requisition.width + priv->sb_spacing;
allocation->width = MAX (1, ((gint) allocation->width
- ((gint) vsb_requisition.width + priv->sb_spacing)));
}
if (priv->hsb_visible) {
GtkRequisition hsb_requisition;
gtk_widget_get_child_requisition (priv->hsb, &hsb_requisition);
if (priv->frame_placement == GTK_CORNER_BOTTOM_LEFT
|| priv->frame_placement == GTK_CORNER_BOTTOM_RIGHT)
allocation->y += hsb_requisition.height + priv->sb_spacing;
allocation->height = MAX (1, ((gint) allocation->height
- ((gint) hsb_requisition.height + priv->sb_spacing)));
}
}
/* Size_allocate handler for the scroll frame widget */
static void
e_scroll_frame_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
GtkBin *bin;
GtkAllocation relative_allocation;
GtkAllocation child_allocation;
gint xthickness, ythickness;
g_return_if_fail (widget != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (widget));
g_return_if_fail (allocation != NULL);
sf = E_SCROLL_FRAME (widget);
priv = sf->priv;
bin = GTK_BIN (widget);
widget->allocation = *allocation;
if (priv->hsb_policy == GTK_POLICY_ALWAYS)
priv->hsb_visible = TRUE;
else if (priv->hsb_policy == GTK_POLICY_NEVER)
priv->hsb_visible = FALSE;
if (priv->vsb_policy == GTK_POLICY_ALWAYS)
priv->vsb_visible = TRUE;
else if (priv->vsb_policy == GTK_POLICY_NEVER)
priv->vsb_visible = FALSE;
if (priv->shadow_type == GTK_SHADOW_NONE) {
xthickness = 0;
ythickness = 0;
} else {
xthickness = widget->style->klass->xthickness;
ythickness = widget->style->klass->ythickness;
}
if (bin->child && GTK_WIDGET_VISIBLE (bin->child)) {
gboolean previous_hvis;
gboolean previous_vvis;
guint count = 0;
do {
compute_relative_allocation (widget, &relative_allocation);
priv->frame_x = relative_allocation.x + allocation->x;
priv->frame_y = relative_allocation.y + allocation->y;
priv->frame_w = relative_allocation.width;
priv->frame_h = relative_allocation.height;
child_allocation.x = priv->frame_x + xthickness;
child_allocation.y = priv->frame_y + ythickness;
child_allocation.width = MAX ((gint)priv->frame_w - 2 * xthickness, 0);
child_allocation.height = MAX ((gint)priv->frame_h - 2 * ythickness, 0);
previous_hvis = priv->hsb_visible;
previous_vvis = priv->vsb_visible;
gtk_widget_size_allocate (bin->child, &child_allocation);
/* If, after the first iteration, the hscrollbar and the
* vscrollbar flip visiblity, then we need both.
*/
if (count
&& previous_hvis != priv->hsb_visible
&& previous_vvis != priv->vsb_visible) {
priv->hsb_visible = TRUE;
priv->vsb_visible = TRUE;
/* a new resize is already queued at this point,
* so we will immediatedly get reinvoked
*/
return;
}
count++;
} while (previous_hvis != priv->hsb_visible
|| previous_vvis != priv->vsb_visible);
} else
compute_relative_allocation (widget, &relative_allocation);
if (priv->hsb_visible) {
GtkRequisition hscrollbar_requisition;
gtk_widget_get_child_requisition (priv->hsb, &hscrollbar_requisition);
if (!GTK_WIDGET_VISIBLE (priv->hsb))
gtk_widget_show (priv->hsb);
child_allocation.x = relative_allocation.x;
if (priv->frame_placement == GTK_CORNER_TOP_LEFT
|| priv->frame_placement == GTK_CORNER_TOP_RIGHT)
child_allocation.y = (relative_allocation.y
+ relative_allocation.height
+ priv->sb_spacing);
else
child_allocation.y = GTK_CONTAINER (sf)->border_width;
child_allocation.width = relative_allocation.width;
child_allocation.height = hscrollbar_requisition.height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
gtk_widget_size_allocate (priv->hsb, &child_allocation);
} else if (GTK_WIDGET_VISIBLE (priv->hsb))
gtk_widget_hide (priv->hsb);
if (priv->vsb_visible) {
GtkRequisition vscrollbar_requisition;
if (!GTK_WIDGET_VISIBLE (priv->vsb))
gtk_widget_show (priv->vsb);
gtk_widget_get_child_requisition (priv->vsb, &vscrollbar_requisition);
if (priv->frame_placement == GTK_CORNER_TOP_LEFT
|| priv->frame_placement == GTK_CORNER_BOTTOM_LEFT)
child_allocation.x = (relative_allocation.x
+ relative_allocation.width
+ priv->sb_spacing);
else
child_allocation.x = GTK_CONTAINER (sf)->border_width;
child_allocation.y = relative_allocation.y;
child_allocation.width = vscrollbar_requisition.width;
child_allocation.height = relative_allocation.height;
child_allocation.x += allocation->x;
child_allocation.y += allocation->y;
gtk_widget_size_allocate (priv->vsb, &child_allocation);
} else if (GTK_WIDGET_VISIBLE (priv->vsb))
gtk_widget_hide (priv->vsb);
}
/* Button press handler for the scroll framw diget */
static gint
e_scroll_frame_button_press (GtkWidget *widget, GdkEventButton *event)
{
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (E_IS_SCROLL_FRAME (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
/* This is to handle mouse wheel scrolling */
if (event->button == 4 || event->button == 5) {
GtkAdjustment *adj;
gfloat new_value;
gtk_object_get (GTK_OBJECT (widget),
(event->state & GDK_CONTROL_MASK) ?
"hadjustment" : "vadjustment",
&adj,
NULL);
new_value = adj->value + ((event->button == 4) ?
-adj->page_increment / 2:
adj->page_increment / 2);
new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
gtk_adjustment_set_value (adj, new_value);
return TRUE;
}
return FALSE;
}
/* Expose handler for the scroll frame widget */
static gint
e_scroll_frame_expose (GtkWidget *widget, GdkEventExpose *event)
{
EScrollFrame *sf;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (E_IS_SCROLL_FRAME (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
sf = E_SCROLL_FRAME (widget);
if (GTK_WIDGET_DRAWABLE (widget))
draw_shadow (sf, &event->area);
if (GTK_WIDGET_CLASS (parent_class)->expose_event)
(* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);
return FALSE;
}
/* Add handler for the scroll frame widget */
static void
e_scroll_frame_add (GtkContainer *container, GtkWidget *child)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
GtkBin *bin;
sf = E_SCROLL_FRAME (container);
priv = sf->priv;
bin = GTK_BIN (container);
g_return_if_fail (bin->child == NULL);
bin->child = child;
gtk_widget_set_parent (child, GTK_WIDGET (bin));
/* this is a temporary message */
if (!gtk_widget_set_scroll_adjustments (child,
gtk_range_get_adjustment (GTK_RANGE (priv->hsb)),
gtk_range_get_adjustment (GTK_RANGE (priv->vsb))))
#if 0
g_warning ("e_scroll_frame_add(): cannot add non scrollable widget "
"use e_scroll_frame_add_with_viewport() instead");
#else
;
#endif
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);
}
}
/* Remove method for the scroll frame widget */
static void
e_scroll_frame_remove (GtkContainer *container, GtkWidget *child)
{
g_return_if_fail (container != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (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 */
if (GTK_CONTAINER_CLASS (parent_class)->remove)
(* GTK_CONTAINER_CLASS (parent_class)->remove) (container, child);
}
/**
* e_scroll_frame_new:
* @hadj: If non-NULL, the adjustment to use for horizontal scrolling.
* @vadj: If non-NULL, the adjustment to use for vertical scrolling.
*
* Creates a new scroll frame widget.
*
* Return value: The newly-created scroll frame widget.
**/
GtkWidget *
e_scroll_frame_new (GtkAdjustment *hadj, GtkAdjustment *vadj)
{
if (hadj)
g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadj), NULL);
if (vadj)
g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadj), NULL);
return gtk_widget_new (E_TYPE_SCROLL_FRAME,
"hadjustment", hadj,
"vadjustment", vadj,
NULL);
}
/* Callback used when one of the scroll frame widget's adjustments changes */
static void
adjustment_changed (GtkAdjustment *adj, gpointer data)
{
EScrollFrame *sf;
ScrollFramePrivate *priv;
g_return_if_fail (adj != NULL);
g_return_if_fail (GTK_IS_ADJUSTMENT (adj));
g_return_if_fail (data != NULL);
sf = E_SCROLL_FRAME (data);
priv = sf->priv;
if (adj == gtk_range_get_adjustment (GTK_RANGE (priv->hsb))) {
if (priv->hsb_policy == GTK_POLICY_AUTOMATIC) {
gboolean visible;
visible = priv->hsb_visible;
priv->hsb_visible = (adj->upper - adj->lower > adj->page_size);
if (priv->hsb_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (sf));
}
} else if (adj == gtk_range_get_adjustment (GTK_RANGE (priv->vsb))) {
if (priv->vsb_policy == GTK_POLICY_AUTOMATIC) {
gboolean visible;
visible = priv->vsb_visible;
priv->vsb_visible = (adj->upper - adj->lower > adj->page_size);
if (priv->vsb_visible != visible)
gtk_widget_queue_resize (GTK_WIDGET (sf));
}
}
}
/**
* e_scroll_frame_set_hadjustment:
* @sf: A scroll frame widget.
* @adj: An adjustment.
*
* Sets the adjustment to be used for horizontal scrolling in a scroll frame
* widget.
**/
void
e_scroll_frame_set_hadjustment (EScrollFrame *sf, GtkAdjustment *adj)
{
ScrollFramePrivate *priv;
g_return_if_fail (sf != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (sf));
priv = sf->priv;
if (adj)
g_return_if_fail (GTK_IS_ADJUSTMENT (adj));
else
adj = GTK_ADJUSTMENT (gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL));
if (!priv->hsb) {
gtk_widget_push_composite_child ();
priv->hsb = gtk_hscrollbar_new (adj);
gtk_widget_set_composite_name (priv->hsb, "hscrollbar");
gtk_widget_pop_composite_child ();
gtk_widget_set_parent (priv->hsb, GTK_WIDGET (sf));
gtk_widget_ref (priv->hsb);
gtk_widget_show (priv->hsb);
} else {
GtkAdjustment *old_adj;
old_adj = gtk_range_get_adjustment (GTK_RANGE (priv->hsb));
if (old_adj == adj)
return;
gtk_signal_disconnect_by_func (GTK_OBJECT (old_adj),
GTK_SIGNAL_FUNC (adjustment_changed),
sf);
gtk_range_set_adjustment (GTK_RANGE (priv->hsb), adj);
}
adj = gtk_range_get_adjustment (GTK_RANGE (priv->hsb));
gtk_signal_connect (GTK_OBJECT (adj),
"changed",
GTK_SIGNAL_FUNC (adjustment_changed),
sf);
adjustment_changed (adj, sf);
if (GTK_BIN (sf)->child)
gtk_widget_set_scroll_adjustments (
GTK_BIN (sf)->child,
gtk_range_get_adjustment (GTK_RANGE (priv->hsb)),
gtk_range_get_adjustment (GTK_RANGE (priv->vsb)));
}
/**
* e_scroll_frame_set_vadjustment:
* @sf: A scroll frame widget.
* @adj: An adjustment.
*
* Sets the adjustment to be used for vertical scrolling in a scroll frame
* widget.
**/
void
e_scroll_frame_set_vadjustment (EScrollFrame *sf, GtkAdjustment *adj)
{
ScrollFramePrivate *priv;
g_return_if_fail (sf != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (sf));
priv = sf->priv;
if (adj)
g_return_if_fail (GTK_IS_ADJUSTMENT (adj));
else
adj = GTK_ADJUSTMENT (gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL));
if (!priv->vsb) {
gtk_widget_push_composite_child ();
priv->vsb = gtk_vscrollbar_new (adj);
gtk_widget_set_composite_name (priv->vsb, "vscrollbar");
gtk_widget_pop_composite_child ();
gtk_widget_set_parent (priv->vsb, GTK_WIDGET (sf));
gtk_widget_ref (priv->vsb);
gtk_widget_show (priv->vsb);
} else {
GtkAdjustment *old_adj;
old_adj = gtk_range_get_adjustment (GTK_RANGE (priv->vsb));
if (old_adj == adj)
return;
gtk_signal_disconnect_by_func (GTK_OBJECT (old_adj),
GTK_SIGNAL_FUNC (adjustment_changed),
sf);
gtk_range_set_adjustment (GTK_RANGE (priv->vsb), adj);
}
adj = gtk_range_get_adjustment (GTK_RANGE (priv->vsb));
gtk_signal_connect (GTK_OBJECT (adj),
"changed",
GTK_SIGNAL_FUNC (adjustment_changed),
sf);
adjustment_changed (adj, sf);
if (GTK_BIN (sf)->child)
gtk_widget_set_scroll_adjustments (
GTK_BIN (sf)->child,
gtk_range_get_adjustment (GTK_RANGE (priv->hsb)),
gtk_range_get_adjustment (GTK_RANGE (priv->vsb)));
}
/**
* e_scroll_frame_get_hadjustment:
* @sf: A scroll frame widget.
*
* Queries the horizontal adjustment of a scroll frame widget.
*
* Return value: The horizontal adjustment of the scroll frame, or NULL if none.
**/
GtkAdjustment *
e_scroll_frame_get_hadjustment (EScrollFrame *sf)
{
ScrollFramePrivate *priv;
g_return_val_if_fail (sf != NULL, NULL);
g_return_val_if_fail (E_IS_SCROLL_FRAME (sf), NULL);
priv = sf->priv;
return priv->hsb ? gtk_range_get_adjustment (GTK_RANGE (priv->hsb)) : NULL;
}
/**
* e_scroll_frame_get_vadjustment:
* @sf: A scroll frame widget.
*
* Queries the vertical adjustment of a scroll frame widget.
*
* Return value: The vertical adjustment of the scroll frame, or NULL if none.
**/
GtkAdjustment *
e_scroll_frame_get_vadjustment (EScrollFrame *sf)
{
ScrollFramePrivate *priv;
g_return_val_if_fail (sf != NULL, NULL);
g_return_val_if_fail (E_IS_SCROLL_FRAME (sf), NULL);
priv = sf->priv;
return priv->vsb ? gtk_range_get_adjustment (GTK_RANGE (priv->vsb)) : NULL;
}
/**
* e_scroll_frame_set_policy:
* @sf: A scroll frame widget.
* @hsb_policy: Policy for the horizontal scrollbar.
* @vsb_policy: Policy for the vertical scrollbar.
*
* Sets the scrollbar policies of a scroll frame widget. These determine when
* the scrollbars are to be shown or hidden.
**/
void
e_scroll_frame_set_policy (EScrollFrame *sf,
GtkPolicyType hsb_policy,
GtkPolicyType vsb_policy)
{
ScrollFramePrivate *priv;
g_return_if_fail (sf != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (sf));
priv = sf->priv;
if (priv->hsb_policy == hsb_policy && priv->vsb_policy == vsb_policy)
return;
priv->hsb_policy = hsb_policy;
priv->vsb_policy = vsb_policy;
gtk_widget_queue_resize (GTK_WIDGET (sf));
}
/**
* e_scroll_frame_set_placement:
* @sf: A scroll frame widget.
* @frame_placement: Placement for the frame.
*
* Sets the placement of a scroll frame widget's frame with respect to its
* scrollbars.
**/
void
e_scroll_frame_set_placement (EScrollFrame *sf, GtkCornerType frame_placement)
{
ScrollFramePrivate *priv;
g_return_if_fail (sf != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (sf));
priv = sf->priv;
if (priv->frame_placement == frame_placement)
return;
priv->frame_placement = frame_placement;
gtk_widget_queue_resize (GTK_WIDGET (sf));
}
/**
* e_scroll_frame_set_shadow_type:
* @sf: A scroll frame widget.
* @shadow_type: A shadow type.
*
* Sets the shadow type of a scroll frame widget. You can use this when you
* insert a child that does not paint a frame on its own.
**/
void
e_scroll_frame_set_shadow_type (EScrollFrame *sf, GtkShadowType shadow_type)
{
ScrollFramePrivate *priv;
g_return_if_fail (sf != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (sf));
g_return_if_fail (shadow_type >= GTK_SHADOW_NONE && shadow_type <= GTK_SHADOW_ETCHED_OUT);
priv = sf->priv;
if (priv->shadow_type == shadow_type)
return;
priv->shadow_type = shadow_type;
gtk_widget_queue_resize (GTK_WIDGET (sf));
}
/**
* e_scroll_frame_set_scrollbar_spacing:
* @sf: A scroll frame widget.
* @spacing: Desired spacing in pixels.
*
* Sets the spacing between the frame and the scrollbars of a scroll frame
* widget.
**/
void
e_scroll_frame_set_scrollbar_spacing (EScrollFrame *sf, guint spacing)
{
ScrollFramePrivate *priv;
g_return_if_fail (sf != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (sf));
priv = sf->priv;
if (priv->sb_spacing == spacing)
return;
priv->sb_spacing = spacing;
gtk_widget_queue_resize (GTK_WIDGET (sf));
}
/**
* e_scroll_frame_add_with_viewport:
* @sf: A scroll frame widget.
* @child: A widget.
*
* Creates a #GtkViewport and puts the specified child inside it, thus allowing
* the viewport to be scrolled by the scroll frame widget. This is meant to be
* used only when a child does not support the scrolling interface.
**/
void
e_scroll_frame_add_with_viewport (EScrollFrame *sf, GtkWidget *child)
{
ScrollFramePrivate *priv;
GtkBin *bin;
GtkWidget *viewport;
g_return_if_fail (sf != NULL);
g_return_if_fail (E_IS_SCROLL_FRAME (sf));
g_return_if_fail (child != NULL);
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (child->parent == NULL);
priv = sf->priv;
bin = GTK_BIN (sf);
if (bin->child != NULL) {
g_return_if_fail (GTK_IS_VIEWPORT (bin->child));
g_return_if_fail (GTK_BIN (bin->child)->child == NULL);
viewport = bin->child;
} else {
viewport = gtk_viewport_new (e_scroll_frame_get_hadjustment (sf),
e_scroll_frame_get_vadjustment (sf));
gtk_container_add (GTK_CONTAINER (sf), viewport);
}
gtk_widget_show (viewport);
gtk_container_add (GTK_CONTAINER (viewport), child);
}
