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Diffstat (limited to 'libgimpwidgets/gimpruler.c')
| -rw-r--r-- | libgimpwidgets/gimpruler.c | 1465 |
1 files changed, 1465 insertions, 0 deletions
diff --git a/libgimpwidgets/gimpruler.c b/libgimpwidgets/gimpruler.c new file mode 100644 index 0000000..db9f538 --- /dev/null +++ b/libgimpwidgets/gimpruler.c @@ -0,0 +1,1465 @@ +/* LIBGIMP - The GIMP 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 "libgimpbase/gimpbase.h" +#include "libgimpmath/gimpmath.h" + +#include "gimpwidgetstypes.h" + +#include "gimpruler.h" + + +/** + * SECTION: gimpruler + * @title: GimpRuler + * @short_description: A ruler widget with configurable unit and orientation. + * + * A ruler widget with configurable unit and orientation. + **/ + + +#define DEFAULT_RULER_FONT_SCALE PANGO_SCALE_SMALL +#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 +}; + + +/* 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.) + */ +typedef struct +{ + GtkOrientation orientation; + GimpUnit 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; + gdouble font_scale; + + GList *track_widgets; +} GimpRulerPrivate; + +#define GIMP_RULER_GET_PRIVATE(ruler) \ + ((GimpRulerPrivate *) gimp_ruler_get_instance_private ((GimpRuler *) (ruler))) + + +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 = +{ + { 1, 2, 6, 12, 36, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, 50000, 100000 }, + { 1, 4, 8, 16, 12 * 16 } +}; + +static const RulerMetric ruler_metric_feet = +{ + { 1, 2, 6, 12, 36, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, 50000, 100000 }, + { 1, 3, 6, 12, 12 * 8 } +}; + +static const RulerMetric ruler_metric_yards = +{ + { 1, 2, 6, 12, 36, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, 50000, 100000 }, + { 1, 3, 6, 12, 12 * 12 } +}; + + +static void gimp_ruler_dispose (GObject *object); +static void gimp_ruler_set_property (GObject *object, + guint prop_id, + const GValue *value, + GParamSpec *pspec); +static void gimp_ruler_get_property (GObject *object, + guint prop_id, + GValue *value, + GParamSpec *pspec); + +static void gimp_ruler_realize (GtkWidget *widget); +static void gimp_ruler_unrealize (GtkWidget *widget); +static void gimp_ruler_map (GtkWidget *widget); +static void gimp_ruler_unmap (GtkWidget *widget); +static void gimp_ruler_size_allocate (GtkWidget *widget, + GtkAllocation *allocation); +static void gimp_ruler_size_request (GtkWidget *widget, + GtkRequisition *requisition); +static void gimp_ruler_style_set (GtkWidget *widget, + GtkStyle *prev_style); +static gboolean gimp_ruler_motion_notify (GtkWidget *widget, + GdkEventMotion *event); +static gboolean gimp_ruler_expose (GtkWidget *widget, + GdkEventExpose *event); + +static void gimp_ruler_draw_ticks (GimpRuler *ruler); +static GdkRectangle gimp_ruler_get_pos_rect (GimpRuler *ruler, + gdouble position); +static gboolean gimp_ruler_idle_queue_pos_redraw (gpointer data); +static void gimp_ruler_queue_pos_redraw (GimpRuler *ruler); +static void gimp_ruler_draw_pos (GimpRuler *ruler, + cairo_t *cr); +static void gimp_ruler_make_pixmap (GimpRuler *ruler); +static PangoLayout * gimp_ruler_get_layout (GtkWidget *widget, + const gchar *text); +static const RulerMetric * + gimp_ruler_get_metric (GimpUnit unit); + + +G_DEFINE_TYPE_WITH_PRIVATE (GimpRuler, gimp_ruler, GTK_TYPE_WIDGET) + +#define parent_class gimp_ruler_parent_class + + +static void +gimp_ruler_class_init (GimpRulerClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass); + + object_class->dispose = gimp_ruler_dispose; + object_class->set_property = gimp_ruler_set_property; + object_class->get_property = gimp_ruler_get_property; + + widget_class->realize = gimp_ruler_realize; + widget_class->unrealize = gimp_ruler_unrealize; + widget_class->map = gimp_ruler_map; + widget_class->unmap = gimp_ruler_unmap; + widget_class->size_allocate = gimp_ruler_size_allocate; + widget_class->size_request = gimp_ruler_size_request; + widget_class->style_set = gimp_ruler_style_set; + widget_class->motion_notify_event = gimp_ruler_motion_notify; + widget_class->expose_event = gimp_ruler_expose; + + g_object_class_install_property (object_class, + PROP_ORIENTATION, + g_param_spec_enum ("orientation", + "Orientation", + "The orientation of the ruler", + GTK_TYPE_ORIENTATION, + GTK_ORIENTATION_HORIZONTAL, + GIMP_PARAM_READWRITE)); + + g_object_class_install_property (object_class, + PROP_UNIT, + gimp_param_spec_unit ("unit", + "Unit", + "Unit of ruler", + TRUE, TRUE, + GIMP_UNIT_PIXEL, + GIMP_PARAM_READWRITE)); + + g_object_class_install_property (object_class, + PROP_LOWER, + g_param_spec_double ("lower", + "Lower", + "Lower limit of ruler", + -G_MAXDOUBLE, + G_MAXDOUBLE, + 0.0, + GIMP_PARAM_READWRITE)); + + g_object_class_install_property (object_class, + PROP_UPPER, + g_param_spec_double ("upper", + "Upper", + "Upper limit of ruler", + -G_MAXDOUBLE, + G_MAXDOUBLE, + 0.0, + GIMP_PARAM_READWRITE)); + + g_object_class_install_property (object_class, + PROP_POSITION, + g_param_spec_double ("position", + "Position", + "Position of mark on the ruler", + -G_MAXDOUBLE, + G_MAXDOUBLE, + 0.0, + GIMP_PARAM_READWRITE)); + + g_object_class_install_property (object_class, + PROP_MAX_SIZE, + g_param_spec_double ("max-size", + "Max Size", + "Maximum size of the ruler", + -G_MAXDOUBLE, + G_MAXDOUBLE, + 0.0, + GIMP_PARAM_READWRITE)); + + gtk_widget_class_install_style_property (widget_class, + g_param_spec_double ("font-scale", + "Font Scale", + "The size of the used font", + 0.0, + G_MAXDOUBLE, + DEFAULT_RULER_FONT_SCALE, + GIMP_PARAM_READABLE)); +} + +static void +gimp_ruler_init (GimpRuler *ruler) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + + gtk_widget_set_has_window (GTK_WIDGET (ruler), FALSE); + + priv->orientation = GTK_ORIENTATION_HORIZONTAL; + priv->unit = GIMP_UNIT_PIXEL; + priv->lower = 0; + priv->upper = 0; + priv->position = 0; + priv->max_size = 0; + + priv->backing_store = NULL; + priv->backing_store_valid = FALSE; + + priv->last_pos_rect.x = 0; + priv->last_pos_rect.y = 0; + priv->last_pos_rect.width = 0; + priv->last_pos_rect.height = 0; + priv->pos_redraw_idle_id = 0; + + priv->font_scale = DEFAULT_RULER_FONT_SCALE; +} + +static void +gimp_ruler_dispose (GObject *object) +{ + GimpRuler *ruler = GIMP_RULER (object); + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + + while (priv->track_widgets) + gimp_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 +gimp_ruler_set_property (GObject *object, + guint prop_id, + const GValue *value, + GParamSpec *pspec) +{ + GimpRuler *ruler = GIMP_RULER (object); + GimpRulerPrivate *priv = GIMP_RULER_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: + gimp_ruler_set_unit (ruler, g_value_get_int (value)); + break; + + case PROP_LOWER: + gimp_ruler_set_range (ruler, + g_value_get_double (value), + priv->upper, + priv->max_size); + break; + case PROP_UPPER: + gimp_ruler_set_range (ruler, + priv->lower, + g_value_get_double (value), + priv->max_size); + break; + + case PROP_POSITION: + gimp_ruler_set_position (ruler, g_value_get_double (value)); + break; + + case PROP_MAX_SIZE: + gimp_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 +gimp_ruler_get_property (GObject *object, + guint prop_id, + GValue *value, + GParamSpec *pspec) +{ + GimpRuler *ruler = GIMP_RULER (object); + GimpRulerPrivate *priv = GIMP_RULER_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; + } +} + +/** + * gimp_ruler_new: + * @orientation: the ruler's orientation. + * + * Creates a new ruler. + * + * Return value: a new #GimpRuler widget. + * + * Since: 2.8 + **/ +GtkWidget * +gimp_ruler_new (GtkOrientation orientation) +{ + return g_object_new (GIMP_TYPE_RULER, + "orientation", orientation, + NULL); +} + +static void +gimp_ruler_update_position (GimpRuler *ruler, + gdouble x, + gdouble y) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + GtkAllocation allocation; + gdouble lower; + gdouble upper; + + gtk_widget_get_allocation (GTK_WIDGET (ruler), &allocation); + gimp_ruler_get_range (ruler, &lower, &upper, NULL); + + if (priv->orientation == GTK_ORIENTATION_HORIZONTAL) + { + gimp_ruler_set_position (ruler, + lower + + (upper - lower) * x / allocation.width); + } + else + { + gimp_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 +gimp_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 +gimp_ruler_track_widget_motion_notify (GtkWidget *widget, + GdkEventMotion *mevent, + GimpRuler *ruler) +{ + gint widget_x; + gint widget_y; + gint ruler_x; + gint ruler_y; + + widget = gtk_get_event_widget ((GdkEvent *) mevent); + + gimp_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)) + { + gimp_ruler_update_position (ruler, ruler_x, ruler_y); + } + + return FALSE; +} + +/** + * gimp_ruler_add_track_widget: + * @ruler: a #GimpRuler + * @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 +gimp_ruler_add_track_widget (GimpRuler *ruler, + GtkWidget *widget) +{ + GimpRulerPrivate *priv; + + g_return_if_fail (GIMP_IS_RULER (ruler)); + g_return_if_fail (GTK_IS_WIDGET (ruler)); + + priv = GIMP_RULER_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 (gimp_ruler_track_widget_motion_notify), + ruler); + g_signal_connect_swapped (widget, "destroy", + G_CALLBACK (gimp_ruler_remove_track_widget), + ruler); +} + +/** + * gimp_ruler_remove_track_widget: + * @ruler: a #GimpRuler + * @widget: the track widget to remove + * + * Removes a previously added track widget from the ruler. See + * gimp_ruler_add_track_widget(). + * + * Since: 2.8 + */ +void +gimp_ruler_remove_track_widget (GimpRuler *ruler, + GtkWidget *widget) +{ + GimpRulerPrivate *priv; + + g_return_if_fail (GIMP_IS_RULER (ruler)); + g_return_if_fail (GTK_IS_WIDGET (ruler)); + + priv = GIMP_RULER_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, + gimp_ruler_track_widget_motion_notify, + ruler); + g_signal_handlers_disconnect_by_func (widget, + gimp_ruler_remove_track_widget, + ruler); +} + +/** + * gimp_ruler_set_unit: + * @ruler: a #GimpRuler + * @unit: the #GimpUnit to set the ruler to + * + * This sets the unit of the ruler. + * + * Since: 2.8 + */ +void +gimp_ruler_set_unit (GimpRuler *ruler, + GimpUnit unit) +{ + GimpRulerPrivate *priv; + + g_return_if_fail (GIMP_IS_RULER (ruler)); + + priv = GIMP_RULER_GET_PRIVATE (ruler); + + if (priv->unit != unit) + { + priv->unit = unit; + g_object_notify (G_OBJECT (ruler), "unit"); + + priv->backing_store_valid = FALSE; + gtk_widget_queue_draw (GTK_WIDGET (ruler)); + } +} + +/** + * gimp_ruler_get_unit: + * @ruler: a #GimpRuler + * + * Return value: the unit currently used in the @ruler widget. + * + * Since: 2.8 + **/ +GimpUnit +gimp_ruler_get_unit (GimpRuler *ruler) +{ + g_return_val_if_fail (GIMP_IS_RULER (ruler), 0); + + return GIMP_RULER_GET_PRIVATE (ruler)->unit; +} + +/** + * gimp_ruler_set_position: + * @ruler: a #GimpRuler + * @position: the position to set the ruler to + * + * This sets the position of the ruler. + * + * Since: 2.8 + */ +void +gimp_ruler_set_position (GimpRuler *ruler, + gdouble position) +{ + GimpRulerPrivate *priv; + + g_return_if_fail (GIMP_IS_RULER (ruler)); + + priv = GIMP_RULER_GET_PRIVATE (ruler); + + if (priv->position != position) + { + GdkRectangle rect; + gint xdiff, ydiff; + + priv->position = position; + g_object_notify (G_OBJECT (ruler), "position"); + + rect = gimp_ruler_get_pos_rect (ruler, priv->position); + + xdiff = rect.x - priv->last_pos_rect.x; + ydiff = rect.y - priv->last_pos_rect.y; + + /* + * 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; + } + + gimp_ruler_queue_pos_redraw (ruler); + } + else if (! priv->pos_redraw_idle_id) + { + priv->pos_redraw_idle_id = + g_idle_add_full (G_PRIORITY_LOW, + gimp_ruler_idle_queue_pos_redraw, + ruler, NULL); + } + } +} + +/** + * gimp_ruler_get_position: + * @ruler: a #GimpRuler + * + * Return value: the current position of the @ruler widget. + * + * Since: 2.8 + **/ +gdouble +gimp_ruler_get_position (GimpRuler *ruler) +{ + g_return_val_if_fail (GIMP_IS_RULER (ruler), 0.0); + + return GIMP_RULER_GET_PRIVATE (ruler)->position; +} + +/** + * gimp_ruler_set_range: + * @ruler: a #GimpRuler + * @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 +gimp_ruler_set_range (GimpRuler *ruler, + gdouble lower, + gdouble upper, + gdouble max_size) +{ + GimpRulerPrivate *priv; + + g_return_if_fail (GIMP_IS_RULER (ruler)); + + priv = GIMP_RULER_GET_PRIVATE (ruler); + + g_object_freeze_notify (G_OBJECT (ruler)); + if (priv->lower != lower) + { + priv->lower = lower; + g_object_notify (G_OBJECT (ruler), "lower"); + } + if (priv->upper != upper) + { + priv->upper = upper; + g_object_notify (G_OBJECT (ruler), "upper"); + } + if (priv->max_size != max_size) + { + priv->max_size = max_size; + g_object_notify (G_OBJECT (ruler), "max-size"); + } + g_object_thaw_notify (G_OBJECT (ruler)); + + priv->backing_store_valid = FALSE; + gtk_widget_queue_draw (GTK_WIDGET (ruler)); +} + +/** + * gimp_ruler_get_range: + * @ruler: a #GimpRuler + * @lower: location to store lower limit of the ruler, or %NULL + * @upper: location to store upper limit of the ruler, or %NULL + * @max_size: 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 #GimpRuler. + * See gimp_ruler_set_range(). + * + * Since: 2.8 + **/ +void +gimp_ruler_get_range (GimpRuler *ruler, + gdouble *lower, + gdouble *upper, + gdouble *max_size) +{ + GimpRulerPrivate *priv; + + g_return_if_fail (GIMP_IS_RULER (ruler)); + + priv = GIMP_RULER_GET_PRIVATE (ruler); + + if (lower) + *lower = priv->lower; + if (upper) + *upper = priv->upper; + if (max_size) + *max_size = priv->max_size; +} + +static void +gimp_ruler_realize (GtkWidget *widget) +{ + GimpRuler *ruler = GIMP_RULER (widget); + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + GtkAllocation allocation; + GdkWindowAttr attributes; + gint attributes_mask; + + GTK_WIDGET_CLASS (gimp_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); + + gimp_ruler_make_pixmap (ruler); +} + +static void +gimp_ruler_unrealize (GtkWidget *widget) +{ + GimpRuler *ruler = GIMP_RULER (widget); + GimpRulerPrivate *priv = GIMP_RULER_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 (gimp_ruler_parent_class)->unrealize (widget); +} + +static void +gimp_ruler_map (GtkWidget *widget) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget); + + GTK_WIDGET_CLASS (parent_class)->map (widget); + + if (priv->input_window) + gdk_window_show (priv->input_window); +} + +static void +gimp_ruler_unmap (GtkWidget *widget) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget); + + if (priv->input_window) + gdk_window_hide (priv->input_window); + + GTK_WIDGET_CLASS (parent_class)->unmap (widget); +} + +static void +gimp_ruler_size_allocate (GtkWidget *widget, + GtkAllocation *allocation) +{ + GimpRuler *ruler = GIMP_RULER (widget); + GimpRulerPrivate *priv = GIMP_RULER_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) + gimp_ruler_make_pixmap (ruler); + } +} + +static void +gimp_ruler_size_request (GtkWidget *widget, + GtkRequisition *requisition) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget); + GtkStyle *style = gtk_widget_get_style (widget); + PangoLayout *layout; + PangoRectangle ink_rect; + gint size; + + layout = gimp_ruler_get_layout (widget, "0123456789"); + pango_layout_get_pixel_extents (layout, &ink_rect, NULL); + + size = 2 + ink_rect.height * 1.7; + + if (priv->orientation == GTK_ORIENTATION_HORIZONTAL) + { + requisition->width = style->xthickness * 2 + 1; + requisition->height = style->ythickness * 2 + size; + } + else + { + requisition->width = style->xthickness * 2 + size; + requisition->height = style->ythickness * 2 + 1; + } +} + +static void +gimp_ruler_style_set (GtkWidget *widget, + GtkStyle *prev_style) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget); + + GTK_WIDGET_CLASS (gimp_ruler_parent_class)->style_set (widget, prev_style); + + gtk_widget_style_get (widget, + "font-scale", &priv->font_scale, + NULL); + + priv->backing_store_valid = FALSE; + + g_clear_object (&priv->layout); +} + +static gboolean +gimp_ruler_motion_notify (GtkWidget *widget, + GdkEventMotion *event) +{ + GimpRuler *ruler = GIMP_RULER (widget); + + gimp_ruler_update_position (ruler, event->x, event->y); + + return FALSE; +} + +static gboolean +gimp_ruler_expose (GtkWidget *widget, + GdkEventExpose *event) +{ + if (gtk_widget_is_drawable (widget)) + { + GimpRuler *ruler = GIMP_RULER (widget); + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + GtkAllocation allocation; + cairo_t *cr; + + if (! priv->backing_store_valid) + gimp_ruler_draw_ticks (ruler); + + cr = gdk_cairo_create (gtk_widget_get_window (widget)); + gdk_cairo_region (cr, event->region); + cairo_clip (cr); + + gtk_widget_get_allocation (widget, &allocation); + cairo_set_source_surface (cr, priv->backing_store, + allocation.x, allocation.y); + cairo_paint (cr); + + gimp_ruler_draw_pos (ruler, cr); + + cairo_destroy (cr); + } + + return FALSE; +} + +static void +gimp_ruler_draw_ticks (GimpRuler *ruler) +{ + GtkWidget *widget = GTK_WIDGET (ruler); + GtkStyle *style = gtk_widget_get_style (widget); + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + GtkStateType state = gtk_widget_get_state (widget); + GtkAllocation allocation; + cairo_t *cr; + gint i; + gint width, height; + gint xthickness; + gint ythickness; + gint length, ideal_length; + gdouble lower, upper; /* Upper and lower limits, in ruler units */ + 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; + GimpUnit 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); + + xthickness = style->xthickness; + ythickness = style->ythickness; + + layout = gimp_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 - ythickness * 2; + } + else + { + width = allocation.height; + height = allocation.width - ythickness * 2; + } + + cr = cairo_create (priv->backing_store); + gdk_cairo_set_source_color (cr, &style->bg[state]); + +#if 0 + gtk_paint_box (style, priv->backing_store, + GTK_STATE_NORMAL, GTK_SHADOW_OUT, + NULL, widget, + priv->orientation == GTK_ORIENTATION_HORIZONTAL ? + "hruler" : "vruler", + 0, 0, + allocation.width, allocation.height); +#else + cairo_paint (cr); +#endif + + gdk_cairo_set_source_color (cr, &style->fg[state]); + + if (priv->orientation == GTK_ORIENTATION_HORIZONTAL) + { + cairo_rectangle (cr, + xthickness, + height + ythickness, + allocation.width - 2 * xthickness, + 1); + } + else + { + cairo_rectangle (cr, + height + xthickness, + ythickness, + 1, + allocation.height - 2 * ythickness); + } + + gimp_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 = gimp_ruler_get_unit (ruler); + + ruler_metric = gimp_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 == GIMP_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 == GIMP_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 + ythickness - length, + 1, length); + } + else + { + cairo_rectangle (cr, + height + xthickness - 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); + +#if 0 + gtk_paint_layout (style, + priv->backing_store, + state, + FALSE, + NULL, + widget, + "hruler", + pos + 2, + ythickness + PANGO_PIXELS (logical_rect.y - digit_offset), + layout); +#else + cairo_move_to (cr, + pos + 2, + ythickness + PANGO_PIXELS (logical_rect.y - digit_offset)); + pango_cairo_show_layout (cr, layout); +#endif + } + 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); + +#if 0 + gtk_paint_layout (style, + priv->backing_store, + state, + FALSE, + NULL, + widget, + "vruler", + xthickness + 1, + pos + digit_height * j + 2 + PANGO_PIXELS (logical_rect.y - digit_offset), + layout); +#else + cairo_move_to (cr, + xthickness + 1, + pos + digit_height * j + 2 + PANGO_PIXELS (logical_rect.y - digit_offset)); + pango_cairo_show_layout (cr, layout); +#endif + + } + } + } + } + } + + cairo_fill (cr); + + priv->backing_store_valid = TRUE; + +out: + cairo_destroy (cr); +} + +static GdkRectangle +gimp_ruler_get_pos_rect (GimpRuler *ruler, + gdouble position) +{ + GtkWidget *widget = GTK_WIDGET (ruler); + GtkStyle *style = gtk_widget_get_style (widget); + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + GtkAllocation allocation; + gint width, height; + gint xthickness; + gint ythickness; + gdouble upper, lower; + gdouble increment; + GdkRectangle rect = { 0, }; + + if (! gtk_widget_is_drawable (widget)) + return rect; + + gtk_widget_get_allocation (widget, &allocation); + + xthickness = style->xthickness; + ythickness = style->ythickness; + + if (priv->orientation == GTK_ORIENTATION_HORIZONTAL) + { + width = allocation.width; + height = allocation.height - ythickness * 2; + + rect.width = height / 2 + 2; + rect.width |= 1; /* make sure it's odd */ + rect.height = rect.width / 2 + 1; + } + else + { + width = allocation.width - xthickness * 2; + height = allocation.height; + + rect.height = width / 2 + 2; + rect.height |= 1; /* make sure it's odd */ + rect.width = rect.height / 2 + 1; + } + + gimp_ruler_get_range (ruler, &lower, &upper, NULL); + + if (priv->orientation == GTK_ORIENTATION_HORIZONTAL) + { + increment = (gdouble) width / (upper - lower); + + rect.x = ROUND ((position - lower) * increment) + (xthickness - rect.width) / 2 - 1; + rect.y = (height + rect.height) / 2 + ythickness; + } + else + { + increment = (gdouble) height / (upper - lower); + + rect.x = (width + rect.width) / 2 + xthickness; + rect.y = ROUND ((position - lower) * increment) + (ythickness - rect.height) / 2 - 1; + } + + rect.x += allocation.x; + rect.y += allocation.y; + + return rect; +} + +static gboolean +gimp_ruler_idle_queue_pos_redraw (gpointer data) +{ + GimpRuler *ruler = data; + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + + gimp_ruler_queue_pos_redraw (ruler); + + priv->pos_redraw_idle_id = 0; + + return G_SOURCE_REMOVE; +} + +static void +gimp_ruler_queue_pos_redraw (GimpRuler *ruler) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + const GdkRectangle rect = gimp_ruler_get_pos_rect (ruler, priv->position); + + gtk_widget_queue_draw_area (GTK_WIDGET (ruler), + rect.x, + rect.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, + priv->last_pos_rect.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 +gimp_ruler_draw_pos (GimpRuler *ruler, + cairo_t *cr) +{ + GtkWidget *widget = GTK_WIDGET (ruler); + GtkStyle *style = gtk_widget_get_style (widget); + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler); + GtkStateType state = gtk_widget_get_state (widget); + GdkRectangle pos_rect; + + if (! gtk_widget_is_drawable (widget)) + return; + + pos_rect = gimp_ruler_get_pos_rect (ruler, gimp_ruler_get_position (ruler)); + + if ((pos_rect.width > 0) && (pos_rect.height > 0)) + { + gdk_cairo_set_source_color (cr, &style->fg[state]); + + 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 +gimp_ruler_make_pixmap (GimpRuler *ruler) +{ + GtkWidget *widget = GTK_WIDGET (ruler); + GimpRulerPrivate *priv = GIMP_RULER_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, + allocation.width, + allocation.height); + + priv->backing_store_valid = FALSE; +} + +static PangoLayout * +gimp_ruler_create_layout (GtkWidget *widget, + const gchar *text) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget); + PangoLayout *layout; + PangoAttrList *attrs; + PangoAttribute *attr; + + layout = gtk_widget_create_pango_layout (widget, text); + + attrs = pango_attr_list_new (); + + attr = pango_attr_scale_new (priv->font_scale); + attr->start_index = 0; + attr->end_index = -1; + pango_attr_list_insert (attrs, attr); + + pango_layout_set_attributes (layout, attrs); + pango_attr_list_unref (attrs); + + return layout; +} + +static PangoLayout * +gimp_ruler_get_layout (GtkWidget *widget, + const gchar *text) +{ + GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget); + + if (priv->layout) + { + pango_layout_set_text (priv->layout, text, -1); + return priv->layout; + } + + priv->layout = gimp_ruler_create_layout (widget, text); + + return priv->layout; +} + +#define FACTOR_EPSILON 0.0000001 +#define FACTOR_EQUAL(u, f) (ABS (f - gimp_unit_get_factor (u)) < FACTOR_EPSILON) + +static const RulerMetric * +gimp_ruler_get_metric (GimpUnit unit) +{ + /* not enabled until we double checked the metrics */ + return &ruler_metric_decimal; + + if (unit == GIMP_UNIT_INCH) + { + return &ruler_metric_inches; + } + 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; +} |