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060978e069
gtk2/gtk/gtkhscrollbar.c
Elliot Lee 060978e069 I submitted this patch twice to gtk-devel-list, and received no comments, 
I submitted this patch twice to gtk-devel-list, and received no comments, so
am committing it.  Although not exhaustively tested, I have been using this
gtk+ for a week w/o problems, and I did read the code to ensure that nothing
ever writes to these data structures. If by chance people encounter SEGV's in
gtk+ code that is setting values in global data structures, this patch could
be a possible culprit.

1998-11-30  Elliot Lee  <sopwith@cuc.ml.org>

	* {gdk,gtk}/*.c: Make read-only data structures "static const" to
	allow them to be shared, mainly including (but not limited to) the
	GtkTypeInfo structures for each class.

	* gtk/gtkfilesel.c: Add /net to the "leave me alone" directory listing.
1998-11-30 19:07:15 +00:00

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/* 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.
*/
#include "gtkhscrollbar.h"
#include "gtksignal.h"
#include "gdk/gdkkeysyms.h"
#define EPSILON 0.01
#define RANGE_CLASS(w) GTK_RANGE_CLASS (GTK_OBJECT (w)->klass)
enum {
ARG_0,
ARG_ADJUSTMENT,
};
static void gtk_hscrollbar_class_init (GtkHScrollbarClass *klass);
static void gtk_hscrollbar_init (GtkHScrollbar *hscrollbar);
static void gtk_hscrollbar_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_hscrollbar_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_hscrollbar_realize (GtkWidget *widget);
static void gtk_hscrollbar_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_hscrollbar_draw_step_forw (GtkRange *range);
static void gtk_hscrollbar_draw_step_back (GtkRange *range);
static void gtk_hscrollbar_slider_update (GtkRange *range);
static void gtk_hscrollbar_calc_slider_size (GtkHScrollbar *hscrollbar);
static gint gtk_hscrollbar_trough_keys (GtkRange *range,
GdkEventKey *key,
GtkScrollType *scroll,
GtkTroughType *pos);
GtkType
gtk_hscrollbar_get_type (void)
{
static GtkType hscrollbar_type = 0;
if (!hscrollbar_type)
{
static const GtkTypeInfo hscrollbar_info =
{
"GtkHScrollbar",
sizeof (GtkHScrollbar),
sizeof (GtkHScrollbarClass),
(GtkClassInitFunc) gtk_hscrollbar_class_init,
(GtkObjectInitFunc) gtk_hscrollbar_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
hscrollbar_type = gtk_type_unique (GTK_TYPE_SCROLLBAR, &hscrollbar_info);
}
return hscrollbar_type;
}
static void
gtk_hscrollbar_class_init (GtkHScrollbarClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
GtkRangeClass *range_class;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
range_class = (GtkRangeClass*) class;
gtk_object_add_arg_type ("GtkHScrollbar::adjustment",
GTK_TYPE_ADJUSTMENT,
GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
ARG_ADJUSTMENT);
object_class->set_arg = gtk_hscrollbar_set_arg;
object_class->get_arg = gtk_hscrollbar_get_arg;
widget_class->realize = gtk_hscrollbar_realize;
widget_class->size_allocate = gtk_hscrollbar_size_allocate;
range_class->draw_step_forw = gtk_hscrollbar_draw_step_forw;
range_class->draw_step_back = gtk_hscrollbar_draw_step_back;
range_class->slider_update = gtk_hscrollbar_slider_update;
range_class->trough_click = gtk_range_default_htrough_click;
range_class->trough_keys = gtk_hscrollbar_trough_keys;
range_class->motion = gtk_range_default_hmotion;
}
static void
gtk_hscrollbar_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkHScrollbar *hscrollbar;
hscrollbar = GTK_HSCROLLBAR (object);
switch (arg_id)
{
case ARG_ADJUSTMENT:
gtk_range_set_adjustment (GTK_RANGE (hscrollbar), GTK_VALUE_POINTER (*arg));
break;
default:
break;
}
}
static void
gtk_hscrollbar_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkHScrollbar *hscrollbar;
hscrollbar = GTK_HSCROLLBAR (object);
switch (arg_id)
{
case ARG_ADJUSTMENT:
GTK_VALUE_POINTER (*arg) = GTK_RANGE (hscrollbar);
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
static void
gtk_hscrollbar_init (GtkHScrollbar *hscrollbar)
{
GtkWidget *widget;
GtkRequisition *requisition;
widget = GTK_WIDGET (hscrollbar);
requisition = &widget->requisition;
requisition->width = (RANGE_CLASS (widget)->min_slider_size +
RANGE_CLASS (widget)->stepper_size +
RANGE_CLASS (widget)->stepper_slider_spacing +
widget->style->klass->xthickness) * 2;
requisition->height = (RANGE_CLASS (widget)->slider_width +
widget->style->klass->ythickness * 2);
}
GtkWidget*
gtk_hscrollbar_new (GtkAdjustment *adjustment)
{
GtkWidget *hscrollbar;
hscrollbar = gtk_widget_new (GTK_TYPE_HSCROLLBAR,
"adjustment", adjustment,
NULL);
return hscrollbar;
}
static void
gtk_hscrollbar_realize (GtkWidget *widget)
{
GtkRange *range;
GdkWindowAttr attributes;
gint attributes_mask;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_HSCROLLBAR (widget));
GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
range = GTK_RANGE (widget);
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y + (widget->allocation.height - widget->requisition.height) / 2;
attributes.width = widget->allocation.width;
attributes.height = widget->requisition.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.event_mask = gtk_widget_get_events (widget);
attributes.event_mask |= (GDK_EXPOSURE_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_ENTER_NOTIFY_MASK |
GDK_LEAVE_NOTIFY_MASK);
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
range->trough = widget->window;
gdk_window_ref (range->trough);
attributes.x = widget->style->klass->xthickness;
attributes.y = widget->style->klass->ythickness;
attributes.width = RANGE_CLASS (widget)->stepper_size;
attributes.height = RANGE_CLASS (widget)->stepper_size;
range->step_back = gdk_window_new (range->trough, &attributes, attributes_mask);
attributes.x = (widget->allocation.width -
widget->style->klass->xthickness -
RANGE_CLASS (widget)->stepper_size);
range->step_forw = gdk_window_new (range->trough, &attributes, attributes_mask);
attributes.x = 0;
attributes.y = widget->style->klass->ythickness;
attributes.width = RANGE_CLASS (widget)->min_slider_size;
attributes.height = RANGE_CLASS (widget)->slider_width;
attributes.event_mask |= (GDK_BUTTON_MOTION_MASK |
GDK_POINTER_MOTION_HINT_MASK);
range->slider = gdk_window_new (range->trough, &attributes, attributes_mask);
gtk_hscrollbar_calc_slider_size (GTK_HSCROLLBAR (widget));
gtk_range_slider_update (GTK_RANGE (widget));
widget->style = gtk_style_attach (widget->style, widget->window);
gdk_window_set_user_data (range->trough, widget);
gdk_window_set_user_data (range->slider, widget);
gdk_window_set_user_data (range->step_forw, widget);
gdk_window_set_user_data (range->step_back, widget);
gtk_style_set_background (widget->style, range->trough, GTK_STATE_ACTIVE);
gtk_style_set_background (widget->style, range->slider, GTK_STATE_NORMAL);
gtk_style_set_background (widget->style, range->step_forw, GTK_STATE_ACTIVE);
gtk_style_set_background (widget->style, range->step_back, GTK_STATE_ACTIVE);
gdk_window_show (range->slider);
gdk_window_show (range->step_forw);
gdk_window_show (range->step_back);
}
static void
gtk_hscrollbar_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkRange *range;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_HSCROLLBAR (widget));
g_return_if_fail (allocation != NULL);
widget->allocation = *allocation;
if (GTK_WIDGET_REALIZED (widget))
{
range = GTK_RANGE (widget);
gdk_window_move_resize (range->trough,
allocation->x,
allocation->y + (allocation->height - widget->requisition.height) / 2,
allocation->width, widget->requisition.height);
gdk_window_move_resize (range->step_back,
widget->style->klass->xthickness,
widget->style->klass->ythickness,
RANGE_CLASS (widget)->stepper_size,
widget->requisition.height - widget->style->klass->ythickness * 2);
gdk_window_move_resize (range->step_forw,
allocation->width - widget->style->klass->xthickness -
RANGE_CLASS (widget)->stepper_size,
widget->style->klass->ythickness,
RANGE_CLASS (widget)->stepper_size,
widget->requisition.height - widget->style->klass->ythickness * 2);
gdk_window_resize (range->slider,
RANGE_CLASS (widget)->min_slider_size,
widget->requisition.height - widget->style->klass->ythickness * 2);
gtk_range_slider_update (GTK_RANGE (widget));
}
}
static void
gtk_hscrollbar_draw_step_forw (GtkRange *range)
{
GtkStateType state_type;
GtkShadowType shadow_type;
g_return_if_fail (range != NULL);
g_return_if_fail (GTK_IS_HSCROLLBAR (range));
if (GTK_WIDGET_DRAWABLE (range))
{
if (range->in_child == RANGE_CLASS (range)->step_forw)
{
if (range->click_child == RANGE_CLASS (range)->step_forw)
state_type = GTK_STATE_ACTIVE;
else
state_type = GTK_STATE_PRELIGHT;
}
else
state_type = GTK_STATE_NORMAL;
if (range->click_child == RANGE_CLASS (range)->step_forw)
shadow_type = GTK_SHADOW_IN;
else
shadow_type = GTK_SHADOW_OUT;
gtk_paint_arrow (GTK_WIDGET (range)->style, range->step_forw,
state_type, shadow_type,
NULL, GTK_WIDGET (range), "hscrollbar",
GTK_ARROW_RIGHT,
TRUE, 0, 0, -1, -1);
}
}
static void
gtk_hscrollbar_draw_step_back (GtkRange *range)
{
GtkStateType state_type;
GtkShadowType shadow_type;
g_return_if_fail (range != NULL);
g_return_if_fail (GTK_IS_HSCROLLBAR (range));
if (GTK_WIDGET_DRAWABLE (range))
{
if (range->in_child == RANGE_CLASS (range)->step_back)
{
if (range->click_child == RANGE_CLASS (range)->step_back)
state_type = GTK_STATE_ACTIVE;
else
state_type = GTK_STATE_PRELIGHT;
}
else
state_type = GTK_STATE_NORMAL;
if (range->click_child == RANGE_CLASS (range)->step_back)
shadow_type = GTK_SHADOW_IN;
else
shadow_type = GTK_SHADOW_OUT;
gtk_paint_arrow (GTK_WIDGET (range)->style, range->step_back,
state_type, shadow_type,
NULL, GTK_WIDGET (range), "hscrollbar",
GTK_ARROW_LEFT,
TRUE, 0, 0, -1, -1);
}
}
static void
gtk_hscrollbar_slider_update (GtkRange *range)
{
g_return_if_fail (range != NULL);
g_return_if_fail (GTK_IS_HSCROLLBAR (range));
gtk_hscrollbar_calc_slider_size (GTK_HSCROLLBAR (range));
gtk_range_default_hslider_update (range);
}
static void
gtk_hscrollbar_calc_slider_size (GtkHScrollbar *hscrollbar)
{
GtkRange *range;
gint step_back_x;
gint step_back_width;
gint step_forw_x;
gint slider_width;
gint slider_height;
gint left, right;
gint width;
g_return_if_fail (hscrollbar != NULL);
g_return_if_fail (GTK_IS_HSCROLLBAR (hscrollbar));
if (GTK_WIDGET_REALIZED (hscrollbar))
{
range = GTK_RANGE (hscrollbar);
gdk_window_get_size (range->step_back, &step_back_width, NULL);
gdk_window_get_position (range->step_back, &step_back_x, NULL);
gdk_window_get_position (range->step_forw, &step_forw_x, NULL);
left = (step_back_x +
step_back_width +
RANGE_CLASS (hscrollbar)->stepper_slider_spacing);
right = step_forw_x - RANGE_CLASS (hscrollbar)->stepper_slider_spacing;
width = right - left;
if ((range->adjustment->page_size > 0) &&
(range->adjustment->lower != range->adjustment->upper))
{
if (range->adjustment->page_size >
(range->adjustment->upper - range->adjustment->lower))
range->adjustment->page_size = range->adjustment->upper - range->adjustment->lower;
width = (width * range->adjustment->page_size /
(range->adjustment->upper - range->adjustment->lower));
if (width < RANGE_CLASS (hscrollbar)->min_slider_size)
width = RANGE_CLASS (hscrollbar)->min_slider_size;
}
gdk_window_get_size (range->slider, &slider_width, &slider_height);
if (slider_width != width)
gdk_window_resize (range->slider, width, slider_height);
}
}
static gint
gtk_hscrollbar_trough_keys(GtkRange *range,
GdkEventKey *key,
GtkScrollType *scroll,
GtkTroughType *pos)
{
gint return_val = FALSE;
switch (key->keyval)
{
case GDK_Left:
return_val = TRUE;
*scroll = GTK_SCROLL_STEP_BACKWARD;
break;
case GDK_Right:
return_val = TRUE;
*scroll = GTK_SCROLL_STEP_FORWARD;
break;
case GDK_Home:
return_val = TRUE;
if (key->state & GDK_CONTROL_MASK)
*scroll = GTK_SCROLL_PAGE_BACKWARD;
else
*pos = GTK_TROUGH_START;
break;
case GDK_End:
return_val = TRUE;
if (key->state & GDK_CONTROL_MASK)
*scroll = GTK_SCROLL_PAGE_FORWARD;
else
*pos = GTK_TROUGH_END;
break;
}
return return_val;
}
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