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gnucash/lib/goffice/graph/gog-legend.c

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/* vim: set sw=8: -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* gog-legend.c :
*
* Copyright (C) 2003-2004 Jody Goldberg (jody@gnome.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <goffice/goffice-config.h>
#include <goffice/graph/gog-legend.h>
#include <goffice/graph/gog-outlined-object.h>
#include <goffice/graph/gog-view.h>
#include <goffice/graph/gog-renderer.h>
#include <goffice/graph/gog-chart.h>
#include <goffice/graph/gog-style.h>
#include <goffice/graph/gog-theme.h>
#include <goffice/utils/go-color.h>
#include <goffice/utils/go-units.h>
#include <gsf/gsf-impl-utils.h>
#include <gtk/gtknotebook.h>
#include <glib/gi18n.h>
struct _GogLegend {
GogOutlinedObject base;
double swatch_size_pts;
double swatch_padding_pts;
gulong chart_cardinality_handle;
gulong chart_child_name_changed_handle;
unsigned cached_count;
gboolean names_changed;
};
typedef GogStyledObjectClass GogLegendClass;
enum {
LEGEND_PROP_0,
LEGEND_SWATCH_SIZE_PTS,
LEGEND_SWATCH_PADDING_PTS
};
static GType gog_legend_view_get_type (void);
static GObjectClass *parent_klass;
static void
gog_legend_set_property (GObject *obj, guint param_id,
GValue const *value, GParamSpec *pspec)
{
GogLegend *legend = GOG_LEGEND (obj);
switch (param_id) {
case LEGEND_SWATCH_SIZE_PTS :
legend->swatch_size_pts = g_value_get_double (value);
break;
case LEGEND_SWATCH_PADDING_PTS :
legend->swatch_padding_pts = g_value_get_double (value);
break;
default: G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, param_id, pspec);
return; /* NOTE : RETURN */
}
}
static void
gog_legend_get_property (GObject *obj, guint param_id,
GValue *value, GParamSpec *pspec)
{
GogLegend *legend = GOG_LEGEND (obj);
switch (param_id) {
case LEGEND_SWATCH_SIZE_PTS :
g_value_set_double (value, legend->swatch_size_pts);
break;
case LEGEND_SWATCH_PADDING_PTS :
g_value_set_double (value, legend->swatch_padding_pts);
break;
default: G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, param_id, pspec);
break;
}
}
static void
cb_chart_names_changed (GogLegend *legend)
{
if (legend->names_changed)
return;
legend->names_changed = TRUE;
gog_object_request_update (GOG_OBJECT (legend));
}
static void
gog_legend_parent_changed (GogObject *obj, gboolean was_set)
{
GogObjectClass *gog_object_klass = GOG_OBJECT_CLASS (parent_klass);
GogLegend *legend = GOG_LEGEND (obj);
if (was_set) {
if (legend->chart_cardinality_handle == 0)
legend->chart_cardinality_handle =
g_signal_connect_object (G_OBJECT (obj->parent),
"notify::cardinality-valid",
G_CALLBACK (gog_object_request_update),
legend, G_CONNECT_SWAPPED);
if (legend->chart_child_name_changed_handle == 0)
legend->chart_child_name_changed_handle =
g_signal_connect_object (G_OBJECT (obj->parent),
"child-name-changed",
G_CALLBACK (cb_chart_names_changed),
legend, G_CONNECT_SWAPPED);
} else {
if (legend->chart_cardinality_handle != 0) {
g_signal_handler_disconnect (G_OBJECT (obj->parent),
legend->chart_cardinality_handle);
legend->chart_cardinality_handle = 0;
}
if (legend->chart_child_name_changed_handle != 0) {
g_signal_handler_disconnect (G_OBJECT (obj->parent),
legend->chart_child_name_changed_handle);
legend->chart_child_name_changed_handle = 0;
}
}
gog_object_klass->parent_changed (obj, was_set);
}
static void
gog_legend_update (GogObject *obj)
{
GogLegend *legend = GOG_LEGEND (obj);
unsigned visible;
gog_chart_get_cardinality (GOG_CHART (obj->parent), NULL, &visible);
if (legend->cached_count != visible)
legend->cached_count = visible;
else if (!legend->names_changed)
return;
legend->names_changed = FALSE;
gog_object_emit_changed (obj, TRUE);
}
static gpointer
gog_legend_editor (GogObject *gobj, GogDataAllocator *dalloc, GnmCmdContext *cc)
{
static guint legend_pref_page = 0;
GtkWidget *notebook = gtk_notebook_new ();
gog_styled_object_editor (GOG_STYLED_OBJECT (gobj), cc, notebook);
gog_style_handle_notebook (notebook, &legend_pref_page);
return notebook;
}
static void
gog_legend_init_style (GogStyledObject *gso, GogStyle *style)
{
style->interesting_fields = GOG_STYLE_OUTLINE | GOG_STYLE_FILL | GOG_STYLE_FONT;
gog_theme_fillin_style (gog_object_get_theme (GOG_OBJECT (gso)),
style, GOG_OBJECT (gso), 0, FALSE);
}
static void
gog_legend_class_init (GogLegendClass *klass)
{
static GogObjectRole const roles[] = {
{ N_("Title"), "GogLabel", 0,
GOG_POSITION_COMPASS, GOG_POSITION_N|GOG_POSITION_ALIGN_CENTER, GOG_OBJECT_NAME_BY_ROLE,
NULL, NULL, NULL, NULL, NULL, NULL },
};
GObjectClass *gobject_klass = (GObjectClass *) klass;
GogObjectClass *gog_klass = (GogObjectClass *) klass;
GogStyledObjectClass *style_klass = (GogStyledObjectClass *) klass;
parent_klass = g_type_class_peek_parent (klass);
gobject_klass->set_property = gog_legend_set_property;
gobject_klass->get_property = gog_legend_get_property;
gog_klass->parent_changed = gog_legend_parent_changed;
gog_klass->update = gog_legend_update;
gog_klass->editor = gog_legend_editor;
gog_klass->view_type = gog_legend_view_get_type ();
style_klass->init_style = gog_legend_init_style;
gog_object_register_roles (gog_klass, roles, G_N_ELEMENTS (roles));
g_object_class_install_property (gobject_klass, LEGEND_SWATCH_SIZE_PTS,
g_param_spec_double ("swatch_size_pts", "Swatch Size pts",
"size of the swatches in pts.",
0, G_MAXDOUBLE, 0, G_PARAM_READWRITE|GOG_PARAM_PERSISTENT));
g_object_class_install_property (gobject_klass, LEGEND_SWATCH_PADDING_PTS,
g_param_spec_double ("swatch_padding_pts", "Swatch Padding pts",
"padding between the swatches in pts.",
0, G_MAXDOUBLE, 0, G_PARAM_READWRITE|GOG_PARAM_PERSISTENT));
}
static void
gog_legend_init (GogLegend *legend)
{
legend->swatch_size_pts = GO_CM_TO_PT ((double).25);
legend->swatch_padding_pts = GO_CM_TO_PT ((double).2);
legend->cached_count = 0;
}
GSF_CLASS (GogLegend, gog_legend,
gog_legend_class_init, gog_legend_init,
GOG_OUTLINED_OBJECT_TYPE)
typedef struct {
GogOutlinedView base;
double line_height;
gboolean uses_lines;
} GogLegendView;
typedef GogOutlinedViewClass GogLegendViewClass;
#define GOG_LEGEND_VIEW_TYPE (gog_legend_view_get_type ())
#define GOG_LEGEND_VIEW(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), GOG_LEGEND_VIEW_TYPE, GogLegendView))
#define IS_GOG_LEGEND_VIEW(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), GOG_LEGEND_VIEW_TYPE))
static GogViewClass *lview_parent_klass;
typedef struct {
GogView const *view;
GogViewRequisition maximum;
gboolean uses_lines;
} size_closure;
static void
cb_size_elements (unsigned i, GogStyle const *style, char const *name,
size_closure *dat)
{
GogViewRequisition req;
gog_renderer_push_style (dat->view->renderer, style);
gog_renderer_measure_text (dat->view->renderer, name, &req);
gog_renderer_pop_style (dat->view->renderer);
if (dat->maximum.w < req.w)
dat->maximum.w = req.w;
if (dat->maximum.h < req.h)
dat->maximum.h = req.h;
if (!dat->uses_lines && (style->interesting_fields & GOG_STYLE_LINE))
dat->uses_lines = TRUE;
}
static void
gog_legend_view_size_request (GogView *v, GogViewRequisition *avail)
{
size_closure dat;
GogViewRequisition res;
GogChart *chart = GOG_CHART (v->model->parent);
GogLegend *l = GOG_LEGEND (v->model);
unsigned n, mult = 1;
#ifdef GOG_WARN_TODO
#warning TODO : make this smarter (multiple columns and shrinking text)
#endif
dat.view = v;
dat.maximum.w = 0.;
dat.maximum.h = gog_renderer_pt2r_y (v->renderer, l->swatch_size_pts);
dat.uses_lines = FALSE;
gog_chart_foreach_elem (chart, TRUE,
(GogEnumFunc) cb_size_elements, &dat);
((GogLegendView *)v)->line_height = dat.maximum.h;
((GogLegendView *)v)->uses_lines = dat.uses_lines;
if (dat.uses_lines)
mult = 3;
/* 1/2 between swatch and label */
res.w = dat.maximum.w + gog_renderer_pt2r_x (v->renderer,
mult * l->swatch_size_pts + .5 * l->swatch_padding_pts);
gog_chart_get_cardinality (chart, NULL, &n);
res.h = n * dat.maximum.h;
gog_view_size_child_request (v, avail, &res);
avail->w = res.w;
avail->h = res.h;
lview_parent_klass->size_request (v, avail);
}
typedef struct {
GogView const *view;
GogViewAllocation swatch;
double step;
double label_offset;
double bottom;
ArtVpath line_path[3];
} render_closure;
static void
cb_render_elements (unsigned i, GogStyle const *base_style, char const *name,
render_closure *dat)
{
GogViewAllocation swatch = dat->swatch;
GogView const *v = dat->view;
GogStyle *style = NULL;
GogViewAllocation pos;
swatch.y += i * dat->step;
/* Allow for floating point inaccuracy */
if (swatch.y > dat->bottom + 0.0001)
return;
if (base_style->interesting_fields & GOG_STYLE_LINE) { /* line and marker */
style = (GogStyle *)base_style;
gog_renderer_push_style (v->renderer, style);
dat->line_path[0].y = dat->line_path[1].y = swatch.y + swatch.h / 2.;
gog_renderer_draw_sharp_path (v->renderer, dat->line_path, NULL);
gog_renderer_draw_marker (v->renderer,
(dat->line_path[0].x + dat->line_path[1].x) / 2.,
dat->line_path[0].y);
} else { /* area swatch */
style = gog_style_dup (base_style);
style->outline.width = 0; /* hairline */
style->outline.color = RGBA_BLACK;
gog_renderer_push_style (v->renderer, style);
gog_renderer_draw_sharp_rectangle (v->renderer, &swatch, NULL);
}
pos.x = swatch.x + dat->label_offset;
pos.y = swatch.y;
pos.h = pos.w = -1;
gog_renderer_draw_text (v->renderer, name, &pos, GTK_ANCHOR_NW, NULL);
gog_renderer_pop_style (v->renderer);
if (style != base_style)
g_object_unref (style);
}
static void
gog_legend_view_render (GogView *v, GogViewAllocation const *bbox)
{
render_closure dat;
GogLegend *l = GOG_LEGEND (v->model);
double pad_x = gog_renderer_pt2r_x (v->renderer, l->swatch_padding_pts);
(lview_parent_klass->render) (v, bbox);
dat.view = v;
dat.swatch.x = v->residual.x;
dat.swatch.y = v->residual.y;
dat.swatch.w = gog_renderer_pt2r_x (v->renderer, l->swatch_size_pts);
dat.swatch.h = gog_renderer_pt2r_y (v->renderer, l->swatch_size_pts);
dat.label_offset = dat.swatch.w + pad_x / 2.;
if (((GogLegendView *)v)->uses_lines) {
dat.line_path[0].code = ART_MOVETO;
dat.line_path[1].code = ART_LINETO;
dat.line_path[2].code = ART_END;
dat.line_path[0].x = dat.swatch.x;
dat.line_path[1].x = dat.swatch.x + 3. * dat.swatch.w;
dat.swatch.x += dat.swatch.w;
dat.label_offset += dat.swatch.w;
}
dat.step = ((GogLegendView *)v)->line_height;
dat.bottom = v->residual.y + v->residual.h -
((GogLegendView *)v)->line_height;
gog_chart_foreach_elem (GOG_CHART (v->model->parent), TRUE,
(GogEnumFunc) cb_render_elements, &dat);
}
static void
gog_legend_view_class_init (GogLegendViewClass *gview_klass)
{
GogViewClass *view_klass = (GogViewClass *) gview_klass;
lview_parent_klass = g_type_class_peek_parent (gview_klass);
view_klass->size_request = gog_legend_view_size_request;
view_klass->render = gog_legend_view_render;
view_klass->clip = TRUE;
}
static GSF_CLASS (GogLegendView, gog_legend_view,
gog_legend_view_class_init, NULL,
GOG_OUTLINED_VIEW_TYPE)
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