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PIKApp/libpikawidgets/pikaruler.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "pikawidgetstypes.h"
#include "pikaruler.h"
/**
* SECTION: pikaruler
* @title: PikaRuler
* @short_description: A ruler widget with configurable unit and orientation.
*
* A ruler widget with configurable unit and orientation.
**/
#define MINIMUM_INCR 5
#define IMMEDIATE_REDRAW_THRESHOLD 20
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_UNIT,
PROP_LOWER,
PROP_UPPER,
PROP_POSITION,
PROP_MAX_SIZE,
N_PROPS
};
static GParamSpec *object_props[N_PROPS] = { NULL, };
/* All distances below are in 1/72nd's of an inch. (According to
* Adobe that's a point, but points are really 1/72.27 in.)
*/
struct _PikaRulerPrivate
{
GtkOrientation orientation;
PikaUnit unit;
gdouble lower;
gdouble upper;
gdouble position;
gdouble max_size;
GdkWindow *input_window;
cairo_surface_t *backing_store;
gboolean backing_store_valid;
GdkRectangle last_pos_rect;
guint pos_redraw_idle_id;
PangoLayout *layout;
GList *track_widgets;
};
#define GET_PRIVATE(obj) (((PikaRuler *) (obj))->priv)
typedef struct
{
const gdouble ruler_scale[16];
const gint subdivide[5];
} RulerMetric;
static const RulerMetric ruler_metric_decimal =
{
{ 1, 2, 5, 10, 25, 50, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, 50000, 100000 },
{ 1, 5, 10, 50, 100 }
};
static const RulerMetric ruler_metric_inches =
{
/* 12 inch = 1 foot; 36 inch = 1 yard; 72 inchs = 1 fathom */
{ 1, 2, 6, 12, 36, 72, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, 50000, 100000 },
/* Inches are divided by multiples of 2. */
{ 1, 2, 4, 8, 16 }
};
static const RulerMetric ruler_metric_feet =
{
/* 3 feet = 1 yard; 6 feet = 1 fathom */
{ 1, 3, 6, 12, 36, 72, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, 50000, 100000 },
/* 1 foot = 12 inches, so let's divide up to 12, */
{ 1, 3, 6, 12,
/* then divide the inch by 2. */
24 }
};
static const RulerMetric ruler_metric_yards =
{
/* 1 fathom = 2 yards. Should we go back to base-10 digits? */
{ 1, 2, 5, 10, 25, 50, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, 50000, 100000 },
/* 1 yard = 3 feet = 36 inches. */
{ 1, 3, 6, 12, 36 }
};
static void pika_ruler_dispose (GObject *object);
static void pika_ruler_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void pika_ruler_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void pika_ruler_realize (GtkWidget *widget);
static void pika_ruler_unrealize (GtkWidget *widget);
static void pika_ruler_map (GtkWidget *widget);
static void pika_ruler_unmap (GtkWidget *widget);
static void pika_ruler_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void pika_ruler_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width);
static void pika_ruler_get_preferred_height (GtkWidget *widget,
gint *minimum_height,
gint *natural_height);
static void pika_ruler_style_updated (GtkWidget *widget);
static gboolean pika_ruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event);
static gboolean pika_ruler_draw (GtkWidget *widget,
cairo_t *cr);
static void pika_ruler_draw_ticks (PikaRuler *ruler);
static GdkRectangle pika_ruler_get_pos_rect (PikaRuler *ruler,
gdouble position);
static gboolean pika_ruler_idle_queue_pos_redraw (gpointer data);
static void pika_ruler_queue_pos_redraw (PikaRuler *ruler);
static void pika_ruler_draw_pos (PikaRuler *ruler,
cairo_t *cr);
static void pika_ruler_make_pixmap (PikaRuler *ruler);
static PangoLayout * pika_ruler_get_layout (GtkWidget *widget,
const gchar *text);
static const RulerMetric *
pika_ruler_get_metric (PikaUnit unit);
G_DEFINE_TYPE_WITH_PRIVATE (PikaRuler, pika_ruler, GTK_TYPE_WIDGET)
#define parent_class pika_ruler_parent_class
static void
pika_ruler_class_init (PikaRulerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->dispose = pika_ruler_dispose;
object_class->set_property = pika_ruler_set_property;
object_class->get_property = pika_ruler_get_property;
widget_class->realize = pika_ruler_realize;
widget_class->unrealize = pika_ruler_unrealize;
widget_class->map = pika_ruler_map;
widget_class->unmap = pika_ruler_unmap;
widget_class->get_preferred_width = pika_ruler_get_preferred_width;
widget_class->get_preferred_height = pika_ruler_get_preferred_height;
widget_class->size_allocate = pika_ruler_size_allocate;
widget_class->style_updated = pika_ruler_style_updated;
widget_class->motion_notify_event = pika_ruler_motion_notify;
widget_class->draw = pika_ruler_draw;
object_props[PROP_ORIENTATION] = g_param_spec_enum ("orientation",
"Orientation",
"The orientation of the ruler",
GTK_TYPE_ORIENTATION,
GTK_ORIENTATION_HORIZONTAL,
PIKA_PARAM_READWRITE);
object_props[PROP_UNIT] = pika_param_spec_unit ("unit",
"Unit",
"Unit of ruler",
TRUE, TRUE,
PIKA_UNIT_PIXEL,
PIKA_PARAM_READWRITE);
object_props[PROP_LOWER] = g_param_spec_double ("lower",
"Lower",
"Lower limit of ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
PIKA_PARAM_READWRITE);
object_props[PROP_UPPER] = g_param_spec_double ("upper",
"Upper",
"Upper limit of ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
PIKA_PARAM_READWRITE);
object_props[PROP_POSITION] = g_param_spec_double ("position",
"Position",
"Position of mark on the ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
PIKA_PARAM_READWRITE);
object_props[PROP_MAX_SIZE] = g_param_spec_double ("max-size",
"Max Size",
"Maximum size of the ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
PIKA_PARAM_READWRITE);
g_object_class_install_properties (object_class, N_PROPS, object_props);
gtk_widget_class_set_css_name (widget_class, "PikaRuler");
}
static void
pika_ruler_init (PikaRuler *ruler)
{
PikaRulerPrivate *priv;
ruler->priv = pika_ruler_get_instance_private (ruler);
priv = ruler->priv;
gtk_widget_set_has_window (GTK_WIDGET (ruler), FALSE);
priv->orientation = GTK_ORIENTATION_HORIZONTAL;
priv->unit = PIKA_UNIT_PIXEL;
}
static void
pika_ruler_dispose (GObject *object)
{
PikaRuler *ruler = PIKA_RULER (object);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
while (priv->track_widgets)
pika_ruler_remove_track_widget (ruler, priv->track_widgets->data);
if (priv->pos_redraw_idle_id)
{
g_source_remove (priv->pos_redraw_idle_id);
priv->pos_redraw_idle_id = 0;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
pika_ruler_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
PikaRuler *ruler = PIKA_RULER (object);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
switch (prop_id)
{
case PROP_ORIENTATION:
priv->orientation = g_value_get_enum (value);
gtk_widget_queue_resize (GTK_WIDGET (ruler));
break;
case PROP_UNIT:
pika_ruler_set_unit (ruler, g_value_get_int (value));
break;
case PROP_LOWER:
pika_ruler_set_range (ruler,
g_value_get_double (value),
priv->upper,
priv->max_size);
break;
case PROP_UPPER:
pika_ruler_set_range (ruler,
priv->lower,
g_value_get_double (value),
priv->max_size);
break;
case PROP_POSITION:
pika_ruler_set_position (ruler, g_value_get_double (value));
break;
case PROP_MAX_SIZE:
pika_ruler_set_range (ruler,
priv->lower,
priv->upper,
g_value_get_double (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
pika_ruler_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
PikaRuler *ruler = PIKA_RULER (object);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
case PROP_UNIT:
g_value_set_int (value, priv->unit);
break;
case PROP_LOWER:
g_value_set_double (value, priv->lower);
break;
case PROP_UPPER:
g_value_set_double (value, priv->upper);
break;
case PROP_POSITION:
g_value_set_double (value, priv->position);
break;
case PROP_MAX_SIZE:
g_value_set_double (value, priv->max_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* pika_ruler_new:
* @orientation: the ruler's orientation.
*
* Creates a new ruler.
*
* Returns: a new #PikaRuler widget.
*
* Since: 2.8
**/
GtkWidget *
pika_ruler_new (GtkOrientation orientation)
{
return g_object_new (PIKA_TYPE_RULER,
"orientation", orientation,
NULL);
}
static void
pika_ruler_update_position (PikaRuler *ruler,
gdouble x,
gdouble y)
{
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
GtkAllocation allocation;
gdouble lower = 0;
gdouble upper = 0;
gtk_widget_get_allocation (GTK_WIDGET (ruler), &allocation);
pika_ruler_get_range (ruler, &lower, &upper, NULL);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
pika_ruler_set_position (ruler,
lower +
(upper - lower) * x / allocation.width);
}
else
{
pika_ruler_set_position (ruler,
lower +
(upper - lower) * y / allocation.height);
}
}
/* Returns TRUE if a translation should be done */
static gboolean
gtk_widget_get_translation_to_window (GtkWidget *widget,
GdkWindow *window,
int *x,
int *y)
{
GdkWindow *w, *widget_window;
if (! gtk_widget_get_has_window (widget))
{
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
*x = -allocation.x;
*y = -allocation.y;
}
else
{
*x = 0;
*y = 0;
}
widget_window = gtk_widget_get_window (widget);
for (w = window;
w && w != widget_window;
w = gdk_window_get_effective_parent (w))
{
gdouble px, py;
gdk_window_coords_to_parent (w, *x, *y, &px, &py);
*x += px;
*y += py;
}
if (w == NULL)
{
*x = 0;
*y = 0;
return FALSE;
}
return TRUE;
}
static void
pika_ruler_event_to_widget_coords (GtkWidget *widget,
GdkWindow *window,
gdouble event_x,
gdouble event_y,
gint *widget_x,
gint *widget_y)
{
gint tx, ty;
if (gtk_widget_get_translation_to_window (widget, window, &tx, &ty))
{
event_x += tx;
event_y += ty;
}
*widget_x = event_x;
*widget_y = event_y;
}
static gboolean
pika_ruler_track_widget_motion_notify (GtkWidget *widget,
GdkEventMotion *mevent,
PikaRuler *ruler)
{
gint widget_x;
gint widget_y;
gint ruler_x;
gint ruler_y;
widget = gtk_get_event_widget ((GdkEvent *) mevent);
pika_ruler_event_to_widget_coords (widget, mevent->window,
mevent->x, mevent->y,
&widget_x, &widget_y);
if (gtk_widget_translate_coordinates (widget, GTK_WIDGET (ruler),
widget_x, widget_y,
&ruler_x, &ruler_y))
{
pika_ruler_update_position (ruler, ruler_x, ruler_y);
}
return FALSE;
}
/**
* pika_ruler_add_track_widget:
* @ruler: a #PikaRuler
* @widget: the track widget to add
*
* Adds a "track widget" to the ruler. The ruler will connect to
* GtkWidget:motion-notify-event: on the track widget and update its
* position marker accordingly. The marker is correctly updated also
* for the track widget's children, regardless of whether they are
* ordinary children of off-screen children.
*
* Since: 2.8
*/
void
pika_ruler_add_track_widget (PikaRuler *ruler,
GtkWidget *widget)
{
PikaRulerPrivate *priv;
g_return_if_fail (PIKA_IS_RULER (ruler));
g_return_if_fail (GTK_IS_WIDGET (ruler));
priv = GET_PRIVATE (ruler);
g_return_if_fail (g_list_find (priv->track_widgets, widget) == NULL);
priv->track_widgets = g_list_prepend (priv->track_widgets, widget);
g_signal_connect (widget, "motion-notify-event",
G_CALLBACK (pika_ruler_track_widget_motion_notify),
ruler);
g_signal_connect_swapped (widget, "destroy",
G_CALLBACK (pika_ruler_remove_track_widget),
ruler);
}
/**
* pika_ruler_remove_track_widget:
* @ruler: a #PikaRuler
* @widget: the track widget to remove
*
* Removes a previously added track widget from the ruler. See
* pika_ruler_add_track_widget().
*
* Since: 2.8
*/
void
pika_ruler_remove_track_widget (PikaRuler *ruler,
GtkWidget *widget)
{
PikaRulerPrivate *priv;
g_return_if_fail (PIKA_IS_RULER (ruler));
g_return_if_fail (GTK_IS_WIDGET (ruler));
priv = GET_PRIVATE (ruler);
g_return_if_fail (g_list_find (priv->track_widgets, widget) != NULL);
priv->track_widgets = g_list_remove (priv->track_widgets, widget);
g_signal_handlers_disconnect_by_func (widget,
pika_ruler_track_widget_motion_notify,
ruler);
g_signal_handlers_disconnect_by_func (widget,
pika_ruler_remove_track_widget,
ruler);
}
/**
* pika_ruler_set_unit:
* @ruler: a #PikaRuler
* @unit: the #PikaUnit to set the ruler to
*
* This sets the unit of the ruler.
*
* Since: 2.8
*/
void
pika_ruler_set_unit (PikaRuler *ruler,
PikaUnit unit)
{
PikaRulerPrivate *priv;
g_return_if_fail (PIKA_IS_RULER (ruler));
priv = GET_PRIVATE (ruler);
if (priv->unit != unit)
{
priv->unit = unit;
g_object_notify_by_pspec (G_OBJECT (ruler), object_props[PROP_UNIT]);
priv->backing_store_valid = FALSE;
gtk_widget_queue_draw (GTK_WIDGET (ruler));
}
}
/**
* pika_ruler_get_unit:
* @ruler: a #PikaRuler
*
* Returns: (transfer none): the unit currently used in the @ruler widget.
*
* Since: 2.8
**/
PikaUnit
pika_ruler_get_unit (PikaRuler *ruler)
{
g_return_val_if_fail (PIKA_IS_RULER (ruler), 0);
return GET_PRIVATE (ruler)->unit;
}
/**
* pika_ruler_set_position:
* @ruler: a #PikaRuler
* @position: the position to set the ruler to
*
* This sets the position of the ruler.
*
* Since: 2.8
*/
void
pika_ruler_set_position (PikaRuler *ruler,
gdouble position)
{
PikaRulerPrivate *priv;
g_return_if_fail (PIKA_IS_RULER (ruler));
priv = GET_PRIVATE (ruler);
if (priv->position != position)
{
GdkRectangle rect;
gint xdiff, ydiff;
priv->position = position;
g_object_notify_by_pspec (G_OBJECT (ruler), object_props[PROP_POSITION]);
rect = pika_ruler_get_pos_rect (ruler, priv->position);
xdiff = rect.x - priv->last_pos_rect.x;
ydiff = rect.y - priv->last_pos_rect.y;
#ifndef GDK_WINDOWING_QUARTZ
/*
* If the position has changed far enough, queue a redraw immediately.
* Otherwise, we only queue a redraw in a low priority idle handler, to
* allow for other things (like updating the canvas) to run.
*
* TODO: This might not be necessary any more in GTK3 with the frame
* clock. Investigate this more after the port to GTK3.
*/
if (priv->last_pos_rect.width != 0 &&
priv->last_pos_rect.height != 0 &&
(ABS (xdiff) > IMMEDIATE_REDRAW_THRESHOLD ||
ABS (ydiff) > IMMEDIATE_REDRAW_THRESHOLD))
{
if (priv->pos_redraw_idle_id)
{
g_source_remove (priv->pos_redraw_idle_id);
priv->pos_redraw_idle_id = 0;
}
pika_ruler_queue_pos_redraw (ruler);
}
else if (! priv->pos_redraw_idle_id)
#else
/*
* pos_redraw_idle_id being set can be counted on to mean
* a redraw is needed (on mac only) since we will not do
* a high priority draws due to the dramatic performance
* they will have.
*/
if (! priv->pos_redraw_idle_id)
#endif
{
priv->pos_redraw_idle_id =
g_idle_add_full (G_PRIORITY_LOW,
pika_ruler_idle_queue_pos_redraw,
ruler, NULL);
}
}
}
/**
* pika_ruler_get_position:
* @ruler: a #PikaRuler
*
* Returns: the current position of the @ruler widget.
*
* Since: 2.8
**/
gdouble
pika_ruler_get_position (PikaRuler *ruler)
{
g_return_val_if_fail (PIKA_IS_RULER (ruler), 0.0);
return GET_PRIVATE (ruler)->position;
}
/**
* pika_ruler_set_range:
* @ruler: a #PikaRuler
* @lower: the lower limit of the ruler
* @upper: the upper limit of the ruler
* @max_size: the maximum size of the ruler used when calculating the space to
* leave for the text
*
* This sets the range of the ruler.
*
* Since: 2.8
*/
void
pika_ruler_set_range (PikaRuler *ruler,
gdouble lower,
gdouble upper,
gdouble max_size)
{
PikaRulerPrivate *priv;
g_return_if_fail (PIKA_IS_RULER (ruler));
priv = GET_PRIVATE (ruler);
g_object_freeze_notify (G_OBJECT (ruler));
if (priv->lower != lower)
{
priv->lower = lower;
g_object_notify_by_pspec (G_OBJECT (ruler), object_props[PROP_LOWER]);
}
if (priv->upper != upper)
{
priv->upper = upper;
g_object_notify_by_pspec (G_OBJECT (ruler), object_props[PROP_UPPER]);
}
if (priv->max_size != max_size)
{
priv->max_size = max_size;
g_object_notify_by_pspec (G_OBJECT (ruler), object_props[PROP_MAX_SIZE]);
}
g_object_thaw_notify (G_OBJECT (ruler));
priv->backing_store_valid = FALSE;
gtk_widget_queue_draw (GTK_WIDGET (ruler));
}
/**
* pika_ruler_get_range:
* @ruler: a #PikaRuler
* @lower: (out) (optional): location to store lower limit of the ruler,
* or %NULL
* @upper: (out) (optional): location to store upper limit of the ruler,
* or %NULL
* @max_size: (out) (optional): location to store the maximum size of the ruler
* used when calculating the space to leave for
* the text, or %NULL.
*
* Retrieves values indicating the range and current position of a #PikaRuler.
* See pika_ruler_set_range().
*
* Since: 2.8
**/
void
pika_ruler_get_range (PikaRuler *ruler,
gdouble *lower,
gdouble *upper,
gdouble *max_size)
{
PikaRulerPrivate *priv;
g_return_if_fail (PIKA_IS_RULER (ruler));
priv = GET_PRIVATE (ruler);
if (lower)
*lower = priv->lower;
if (upper)
*upper = priv->upper;
if (max_size)
*max_size = priv->max_size;
}
static void
pika_ruler_realize (GtkWidget *widget)
{
PikaRuler *ruler = PIKA_RULER (widget);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
GtkAllocation allocation;
GdkWindowAttr attributes;
gint attributes_mask;
GTK_WIDGET_CLASS (pika_ruler_parent_class)->realize (widget);
gtk_widget_get_allocation (widget, &allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.wclass = GDK_INPUT_ONLY;
attributes.event_mask = (gtk_widget_get_events (widget) |
GDK_EXPOSURE_MASK |
GDK_POINTER_MOTION_MASK);
attributes_mask = GDK_WA_X | GDK_WA_Y;
priv->input_window = gdk_window_new (gtk_widget_get_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (priv->input_window, ruler);
pika_ruler_make_pixmap (ruler);
}
static void
pika_ruler_unrealize (GtkWidget *widget)
{
PikaRuler *ruler = PIKA_RULER (widget);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
g_clear_pointer (&priv->backing_store, cairo_surface_destroy);
priv->backing_store_valid = FALSE;
g_clear_object (&priv->layout);
g_clear_pointer (&priv->input_window, gdk_window_destroy);
GTK_WIDGET_CLASS (pika_ruler_parent_class)->unrealize (widget);
}
static void
pika_ruler_map (GtkWidget *widget)
{
PikaRulerPrivate *priv = GET_PRIVATE (widget);
GTK_WIDGET_CLASS (parent_class)->map (widget);
if (priv->input_window)
gdk_window_show (priv->input_window);
}
static void
pika_ruler_unmap (GtkWidget *widget)
{
PikaRulerPrivate *priv = GET_PRIVATE (widget);
if (priv->input_window)
gdk_window_hide (priv->input_window);
GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}
static void
pika_ruler_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
PikaRuler *ruler = PIKA_RULER (widget);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
GtkAllocation widget_allocation;
gboolean resized;
gtk_widget_get_allocation (widget, &widget_allocation);
resized = (widget_allocation.width != allocation->width ||
widget_allocation.height != allocation->height);
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
if (gtk_widget_get_realized (widget))
{
gdk_window_move_resize (priv->input_window,
allocation->x, allocation->y,
allocation->width, allocation->height);
if (resized)
pika_ruler_make_pixmap (ruler);
}
}
static void
pika_ruler_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
PikaRulerPrivate *priv = GET_PRIVATE (widget);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
PangoLayout *layout;
PangoRectangle ink_rect;
GtkBorder border;
gint size;
layout = pika_ruler_get_layout (widget, "0123456789");
pango_layout_get_pixel_extents (layout, &ink_rect, NULL);
size = 2 + ink_rect.height * 1.7;
gtk_style_context_get_border (context, gtk_widget_get_state_flags (widget), &border);
requisition->width = border.left + border.right;
requisition->height = border.top + border.bottom;
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
requisition->width += 1;
requisition->height += size;
}
else
{
requisition->width += size;
requisition->height += 1;
}
}
static void
pika_ruler_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width)
{
GtkRequisition requisition;
pika_ruler_size_request (widget, &requisition);
*minimum_width = *natural_width = requisition.width;
}
static void
pika_ruler_get_preferred_height (GtkWidget *widget,
gint *minimum_height,
gint *natural_height)
{
GtkRequisition requisition;
pika_ruler_size_request (widget, &requisition);
*minimum_height = *natural_height = requisition.height;
}
static void
pika_ruler_style_updated (GtkWidget *widget)
{
PikaRulerPrivate *priv = GET_PRIVATE (widget);
GTK_WIDGET_CLASS (pika_ruler_parent_class)->style_updated (widget);
priv->backing_store_valid = FALSE;
g_clear_object (&priv->layout);
}
static gboolean
pika_ruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event)
{
PikaRuler *ruler = PIKA_RULER (widget);
pika_ruler_update_position (ruler, event->x, event->y);
return FALSE;
}
static gboolean
pika_ruler_draw (GtkWidget *widget,
cairo_t *cr)
{
PikaRuler *ruler = PIKA_RULER (widget);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
gtk_render_background (context, cr, 0, 0, allocation.width, allocation.height);
gtk_render_frame (context, cr, 0, 0, allocation.width, allocation.height);
if (! priv->backing_store_valid)
pika_ruler_draw_ticks (ruler);
cairo_set_source_surface (cr, priv->backing_store, 0, 0);
cairo_paint (cr);
pika_ruler_draw_pos (ruler, cr);
return FALSE;
}
static void
pika_ruler_draw_ticks (PikaRuler *ruler)
{
GtkWidget *widget = GTK_WIDGET (ruler);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
GtkAllocation allocation;
GtkBorder border;
GdkRGBA color;
cairo_t *cr;
gint i;
gint width, height;
gint length, ideal_length;
gdouble lower = 0; /* Upper and lower limits, in ruler units */
gdouble upper = 0;
gdouble increment; /* Number of pixels per unit */
gint scale; /* Number of units per major unit */
gdouble start, end, cur;
gchar unit_str[32];
gint digit_height;
gint digit_offset;
gint text_size;
gint pos;
gdouble max_size;
PikaUnit unit;
PangoLayout *layout;
PangoRectangle logical_rect, ink_rect;
const RulerMetric *ruler_metric;
if (! gtk_widget_is_drawable (widget))
return;
gtk_widget_get_allocation (widget, &allocation);
gtk_style_context_get_border (context, gtk_widget_get_state_flags (widget), &border);
layout = pika_ruler_get_layout (widget, "0123456789");
pango_layout_get_extents (layout, &ink_rect, &logical_rect);
digit_height = PANGO_PIXELS (ink_rect.height) + 2;
digit_offset = ink_rect.y;
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
width = allocation.width;
height = allocation.height - (border.top + border.bottom);
}
else
{
width = allocation.height;
height = allocation.width - (border.top + border.bottom);
}
cr = cairo_create (priv->backing_store);
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
gtk_style_context_get_color (context, gtk_widget_get_state_flags (widget),
&color);
gdk_cairo_set_source_rgba (cr, &color);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
cairo_rectangle (cr,
border.left,
height + border.top,
allocation.width - (border.left + border.right),
1);
}
else
{
cairo_rectangle (cr,
height + border.left,
border.top,
1,
allocation.height - (border.top + border.bottom));
}
pika_ruler_get_range (ruler, &lower, &upper, &max_size);
if ((upper - lower) == 0)
goto out;
increment = (gdouble) width / (upper - lower);
/* determine the scale
* use the maximum extents of the ruler to determine the largest
* possible number to be displayed. Calculate the height in pixels
* of this displayed text. Use this height to find a scale which
* leaves sufficient room for drawing the ruler.
*
* We calculate the text size as for the vruler instead of
* actually measuring the text width, so that the result for the
* scale looks consistent with an accompanying vruler.
*/
scale = ceil (max_size);
g_snprintf (unit_str, sizeof (unit_str), "%d", scale);
text_size = strlen (unit_str) * digit_height + 1;
unit = pika_ruler_get_unit (ruler);
ruler_metric = pika_ruler_get_metric (unit);
for (scale = 0; scale < G_N_ELEMENTS (ruler_metric->ruler_scale); scale++)
if (ruler_metric->ruler_scale[scale] * fabs (increment) > 2 * text_size)
break;
if (scale == G_N_ELEMENTS (ruler_metric->ruler_scale))
scale = G_N_ELEMENTS (ruler_metric->ruler_scale) - 1;
/* drawing starts here */
length = 0;
for (i = G_N_ELEMENTS (ruler_metric->subdivide) - 1; i >= 0; i--)
{
gdouble subd_incr;
/* hack to get proper subdivisions at full pixels */
if (unit == PIKA_UNIT_PIXEL && scale == 1 && i == 1)
subd_incr = 1.0;
else
subd_incr = ((gdouble) ruler_metric->ruler_scale[scale] /
(gdouble) ruler_metric->subdivide[i]);
if (subd_incr * fabs (increment) <= MINIMUM_INCR)
continue;
/* don't subdivide pixels */
if (unit == PIKA_UNIT_PIXEL && subd_incr < 1.0)
continue;
/* Calculate the length of the tickmarks. Make sure that
* this length increases for each set of ticks
*/
ideal_length = height / (i + 1) - 1;
if (ideal_length > ++length)
length = ideal_length;
if (lower < upper)
{
start = floor (lower / subd_incr) * subd_incr;
end = ceil (upper / subd_incr) * subd_incr;
}
else
{
start = floor (upper / subd_incr) * subd_incr;
end = ceil (lower / subd_incr) * subd_incr;
}
for (cur = start; cur <= end; cur += subd_incr)
{
pos = ROUND ((cur - lower) * increment);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
cairo_rectangle (cr,
pos, height + border.top - length,
1, length);
}
else
{
cairo_rectangle (cr,
height + border.left - length, pos,
length, 1);
}
/* draw label */
if (i == 0)
{
g_snprintf (unit_str, sizeof (unit_str), "%d", (int) cur);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
pango_layout_set_text (layout, unit_str, -1);
pango_layout_get_extents (layout, &logical_rect, NULL);
cairo_move_to (cr,
pos + 2,
border.top + PANGO_PIXELS (logical_rect.y - digit_offset));
pango_cairo_show_layout (cr, layout);
}
else
{
gint j;
for (j = 0; j < (int) strlen (unit_str); j++)
{
pango_layout_set_text (layout, unit_str + j, 1);
pango_layout_get_extents (layout, NULL, &logical_rect);
cairo_move_to (cr,
border.left + 1,
pos + digit_height * j + 2 + PANGO_PIXELS (logical_rect.y - digit_offset));
pango_cairo_show_layout (cr, layout);
}
}
}
}
}
cairo_fill (cr);
priv->backing_store_valid = TRUE;
out:
cairo_destroy (cr);
}
static GdkRectangle
pika_ruler_get_pos_rect (PikaRuler *ruler,
gdouble position)
{
GtkWidget *widget = GTK_WIDGET (ruler);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
GtkAllocation allocation;
GtkBorder border;
gint width, height;
gdouble upper = 0;
gdouble lower = 0;
gdouble increment;
GdkRectangle rect = { 0, };
if (! gtk_widget_is_drawable (widget))
return rect;
gtk_widget_get_allocation (widget, &allocation);
gtk_style_context_get_border (context, gtk_widget_get_state_flags (widget), &border);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
width = allocation.width;
height = allocation.height - (border.top + border.bottom);
rect.width = height / 2 + 2;
rect.width |= 1; /* make sure it's odd */
rect.height = rect.width / 2 + 1;
}
else
{
width = allocation.width - (border.left + border.right);
height = allocation.height;
rect.height = width / 2 + 2;
rect.height |= 1; /* make sure it's odd */
rect.width = rect.height / 2 + 1;
}
pika_ruler_get_range (ruler, &lower, &upper, NULL);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
increment = (gdouble) width / (upper - lower);
rect.x = ROUND ((position - lower) * increment) + (border.left + border.right - rect.width) / 2 - 1;
rect.y = (height + rect.height) / 2 + border.top;
}
else
{
increment = (gdouble) height / (upper - lower);
rect.x = (width + rect.width) / 2 + border.left;
rect.y = ROUND ((position - lower) * increment) + (border.top + border.bottom - rect.height) / 2 - 1;
}
return rect;
}
static gboolean
pika_ruler_idle_queue_pos_redraw (gpointer data)
{
PikaRuler *ruler = data;
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
pika_ruler_queue_pos_redraw (ruler);
/*
* pos_redraw_idle_id being set can be counted on to mean
* a redraw is needed (on mac only) since we will not do
* a high priority draws due to the dramatic performance
* they will have.
*/
priv->pos_redraw_idle_id = 0;
return G_SOURCE_REMOVE;
}
static void
pika_ruler_queue_pos_redraw (PikaRuler *ruler)
{
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
const GdkRectangle rect = pika_ruler_get_pos_rect (ruler, priv->position);
GtkAllocation allocation;
gtk_widget_get_allocation (GTK_WIDGET(ruler), &allocation);
gtk_widget_queue_draw_area (GTK_WIDGET (ruler),
rect.x + allocation.x,
rect.y + allocation.y,
rect.width,
rect.height);
if (priv->last_pos_rect.width != 0 &&
priv->last_pos_rect.height != 0)
{
gtk_widget_queue_draw_area (GTK_WIDGET (ruler),
priv->last_pos_rect.x + allocation.x,
priv->last_pos_rect.y + allocation.y,
priv->last_pos_rect.width,
priv->last_pos_rect.height);
priv->last_pos_rect.x = 0;
priv->last_pos_rect.y = 0;
priv->last_pos_rect.width = 0;
priv->last_pos_rect.height = 0;
}
}
static void
pika_ruler_draw_pos (PikaRuler *ruler,
cairo_t *cr)
{
GtkWidget *widget = GTK_WIDGET (ruler);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
GdkRectangle pos_rect;
if (! gtk_widget_is_drawable (widget))
return;
pos_rect = pika_ruler_get_pos_rect (ruler, pika_ruler_get_position (ruler));
if ((pos_rect.width > 0) && (pos_rect.height > 0))
{
GdkRGBA color;
gtk_style_context_get_color (context, gtk_widget_get_state_flags (widget),
&color);
gdk_cairo_set_source_rgba (cr, &color);
cairo_move_to (cr, pos_rect.x, pos_rect.y);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
cairo_line_to (cr, pos_rect.x + pos_rect.width / 2.0,
pos_rect.y + pos_rect.height);
cairo_line_to (cr, pos_rect.x + pos_rect.width,
pos_rect.y);
}
else
{
cairo_line_to (cr, pos_rect.x + pos_rect.width,
pos_rect.y + pos_rect.height / 2.0);
cairo_line_to (cr, pos_rect.x,
pos_rect.y + pos_rect.height);
}
cairo_fill (cr);
}
if (priv->last_pos_rect.width != 0 &&
priv->last_pos_rect.height != 0)
{
gdk_rectangle_union (&priv->last_pos_rect,
&pos_rect,
&priv->last_pos_rect);
}
else
{
priv->last_pos_rect = pos_rect;
}
}
static void
pika_ruler_make_pixmap (PikaRuler *ruler)
{
GtkWidget *widget = GTK_WIDGET (ruler);
PikaRulerPrivate *priv = GET_PRIVATE (ruler);
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
if (priv->backing_store)
cairo_surface_destroy (priv->backing_store);
priv->backing_store =
gdk_window_create_similar_surface (gtk_widget_get_window (widget),
CAIRO_CONTENT_COLOR_ALPHA,
allocation.width,
allocation.height);
priv->backing_store_valid = FALSE;
}
static PangoLayout *
pika_ruler_get_layout (GtkWidget *widget,
const gchar *text)
{
PikaRulerPrivate *priv = GET_PRIVATE (widget);
if (priv->layout)
{
pango_layout_set_text (priv->layout, text, -1);
return priv->layout;
}
priv->layout = gtk_widget_create_pango_layout (widget, text);
return priv->layout;
}
#define FACTOR_EPSILON 0.0000001
#define FACTOR_EQUAL(u, f) (ABS (f - pika_unit_get_factor (u)) < FACTOR_EPSILON)
static const RulerMetric *
pika_ruler_get_metric (PikaUnit unit)
{
if (unit == PIKA_UNIT_INCH)
{
return &ruler_metric_inches;
}
/* XXX: recognizing feet or yard unit this way definitely sucks.
* Actually the subdvision and rule scale rules should probably become
* settable values in unitrc instead of hardcoded rules.
* This way, people would be able to set how they want a unit to be
* shown (we could definitely imagine someone wanting to see inches
* with base-10 divisions).
*/
else if (FACTOR_EQUAL (unit, 0.083333))
{
return &ruler_metric_feet;
}
else if (FACTOR_EQUAL (unit, 0.027778))
{
return &ruler_metric_yards;
}
return &ruler_metric_decimal;
}
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