diff options
Diffstat (limited to 'subprojects/libgd/libgd/gd-two-lines-renderer.c')
| -rw-r--r-- | subprojects/libgd/libgd/gd-two-lines-renderer.c | 632 |
1 files changed, 632 insertions, 0 deletions
diff --git a/subprojects/libgd/libgd/gd-two-lines-renderer.c b/subprojects/libgd/libgd/gd-two-lines-renderer.c new file mode 100644 index 0000000..f5e1ce5 --- /dev/null +++ b/subprojects/libgd/libgd/gd-two-lines-renderer.c @@ -0,0 +1,632 @@ +/* + * Copyright (c) 2011 Red Hat, Inc. + * + * This program 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 2 of the License, or (at your + * option) any later version. + * + * 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 Lesser General Public + * License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Author: Cosimo Cecchi <cosimoc@redhat.com> + * + */ + +#include "gd-two-lines-renderer.h" +#include <string.h> + +#define SUBTITLE_DIM_PERCENTAGE 0.55 +#define SUBTITLE_SIZE_PERCENTAGE 0.82 + +typedef struct _GdTwoLinesRendererPrivate GdTwoLinesRendererPrivate; + +struct _GdTwoLinesRendererPrivate { + gchar *line_two; + gint text_lines; +}; + +enum { + PROP_TEXT_LINES = 1, + PROP_LINE_TWO, + NUM_PROPERTIES +}; + +static GParamSpec *properties[NUM_PROPERTIES] = { NULL, }; + +G_DEFINE_TYPE_WITH_PRIVATE (GdTwoLinesRenderer, gd_two_lines_renderer, GTK_TYPE_CELL_RENDERER_TEXT) + +static PangoLayout * +create_layout_with_attrs (GtkWidget *widget, + const GdkRectangle *cell_area, + GdTwoLinesRenderer *self, + PangoEllipsizeMode ellipsize) +{ + PangoLayout *layout; + gint wrap_width, xpad; + PangoWrapMode wrap_mode; + PangoAlignment alignment; + + g_object_get (self, + "wrap-width", &wrap_width, + "wrap-mode", &wrap_mode, + "alignment", &alignment, + "xpad", &xpad, + NULL); + + layout = pango_layout_new (gtk_widget_get_pango_context (widget)); + + pango_layout_set_ellipsize (layout, ellipsize); + pango_layout_set_alignment (layout, alignment); + + if (wrap_width != -1) + { + pango_layout_set_width (layout, wrap_width * PANGO_SCALE); + pango_layout_set_wrap (layout, wrap_mode); + } + else + { + if (cell_area != NULL) + pango_layout_set_width (layout, (cell_area->width - 2 * xpad) * PANGO_SCALE); + else + pango_layout_set_width (layout, -1); + + pango_layout_set_wrap (layout, PANGO_WRAP_CHAR); + } + + return layout; +} + +static void +apply_subtitle_style_to_layout (GtkStyleContext *context, + PangoLayout *layout, + GtkStateFlags flags) +{ + PangoFontDescription *desc; + PangoAttrList *layout_attr; + PangoAttribute *attr_alpha; + + gtk_style_context_save (context); + gtk_style_context_set_state (context, flags); + gtk_style_context_get (context, gtk_style_context_get_state (context), + "font", &desc, + NULL); + gtk_style_context_restore (context); + + /* Set the font size */ + pango_font_description_set_size (desc, pango_font_description_get_size (desc) * SUBTITLE_SIZE_PERCENTAGE); + pango_layout_set_font_description (layout, desc); + pango_font_description_free (desc); + + /* Set the font alpha */ + layout_attr = pango_attr_list_new (); + attr_alpha = pango_attr_foreground_alpha_new (SUBTITLE_DIM_PERCENTAGE * 65535); + pango_attr_list_insert (layout_attr, attr_alpha); + + pango_layout_set_attributes (layout, layout_attr); + pango_attr_list_unref (layout_attr); +} + +static void +gd_two_lines_renderer_prepare_layouts (GdTwoLinesRenderer *self, + const GdkRectangle *cell_area, + GtkWidget *widget, + PangoLayout **layout_one, + PangoLayout **layout_two) +{ + GdTwoLinesRendererPrivate *priv; + PangoLayout *line_one; + PangoLayout *line_two = NULL; + gchar *text = NULL; + + priv = gd_two_lines_renderer_get_instance_private (self); + + g_object_get (self, + "text", &text, + NULL); + + line_one = create_layout_with_attrs (widget, cell_area, + self, PANGO_ELLIPSIZE_MIDDLE); + + if (priv->line_two == NULL || + g_strcmp0 (priv->line_two, "") == 0) + { + pango_layout_set_height (line_one, - (priv->text_lines)); + + if (text != NULL) + pango_layout_set_text (line_one, text, -1); + } + else + { + GtkStyleContext *context; + + line_two = create_layout_with_attrs (widget, cell_area, + self, PANGO_ELLIPSIZE_END); + + context = gtk_widget_get_style_context (widget); + gtk_style_context_save (context); + apply_subtitle_style_to_layout (context, line_two, GTK_STATE_FLAG_NORMAL); + gtk_style_context_restore (context); + + pango_layout_set_height (line_one, - (priv->text_lines - 1)); + pango_layout_set_height (line_two, -1); + pango_layout_set_text (line_two, priv->line_two, -1); + + if (text != NULL) + pango_layout_set_text (line_one, text, -1); + } + + if (layout_one) + *layout_one = line_one; + if (layout_two) + *layout_two = line_two; + + g_free (text); +} + +static void +gd_two_lines_renderer_get_size (GtkCellRenderer *cell, + GtkWidget *widget, + PangoLayout *layout_1, + PangoLayout *layout_2, + gint *width, + gint *height, + const GdkRectangle *cell_area, + gint *x_offset_1, + gint *x_offset_2, + gint *y_offset) +{ + GdTwoLinesRenderer *self = GD_TWO_LINES_RENDERER (cell); + gint xpad, ypad; + PangoLayout *layout_one, *layout_two; + GdkRectangle layout_one_rect, layout_two_rect, layout_union; + + if (layout_1 == NULL) + { + gd_two_lines_renderer_prepare_layouts (self, cell_area, widget, &layout_one, &layout_two); + } + else + { + layout_one = g_object_ref (layout_1); + + if (layout_2 != NULL) + layout_two = g_object_ref (layout_2); + else + layout_two = NULL; + } + + gtk_cell_renderer_get_padding (cell, &xpad, &ypad); + pango_layout_get_pixel_extents (layout_one, NULL, (PangoRectangle *) &layout_one_rect); + + if (layout_two != NULL) + { + pango_layout_get_pixel_extents (layout_two, NULL, (PangoRectangle *) &layout_two_rect); + + layout_union.width = MAX (layout_one_rect.width, layout_two_rect.width); + layout_union.height = layout_one_rect.height + layout_two_rect.height; + } + else + { + layout_union = layout_one_rect; + } + + if (cell_area) + { + gfloat xalign, yalign; + + gtk_cell_renderer_get_alignment (cell, &xalign, &yalign); + + layout_union.width = MIN (layout_union.width, cell_area->width - 2 * xpad); + layout_union.height = MIN (layout_union.height, cell_area->height - 2 * ypad); + + if (x_offset_1) + { + if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL) + *x_offset_1 = (1.0 - xalign) * (cell_area->width - (layout_one_rect.width + (2 * xpad))); + else + *x_offset_1 = xalign * (cell_area->width - (layout_one_rect.width + (2 * xpad))); + + *x_offset_1 = MAX (*x_offset_1, 0); + } + if (x_offset_2) + { + if (layout_two != NULL) + { + if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL) + *x_offset_2 = (1.0 - xalign) * (cell_area->width - (layout_two_rect.width + (2 * xpad))); + else + *x_offset_2 = xalign * (cell_area->width - (layout_two_rect.width + (2 * xpad))); + + *x_offset_2 = MAX (*x_offset_2, 0); + } + else + { + *x_offset_2 = 0; + } + } + + if (y_offset) + { + *y_offset = yalign * (cell_area->height - (layout_union.height + (2 * ypad))); + *y_offset = MAX (*y_offset, 0); + } + } + else + { + if (x_offset_1) *x_offset_1 = 0; + if (x_offset_2) *x_offset_2 = 0; + if (y_offset) *y_offset = 0; + } + + g_clear_object (&layout_one); + g_clear_object (&layout_two); + + if (height) + *height = ypad * 2 + layout_union.height; + + if (width) + *width = xpad * 2 + layout_union.width; +} + +static void +gd_two_lines_renderer_render (GtkCellRenderer *cell, + cairo_t *cr, + GtkWidget *widget, + const GdkRectangle *background_area, + const GdkRectangle *cell_area, + GtkCellRendererState flags) +{ + GdTwoLinesRenderer *self = GD_TWO_LINES_RENDERER (cell); + GtkStyleContext *context; + gint line_one_height; + GtkStateFlags state; + GdkRectangle area, render_area = *cell_area; + gint xpad, ypad, x_offset_1, x_offset_2, y_offset; + PangoLayout *layout_one, *layout_two; + PangoRectangle layout_rect; + + /* fetch common information */ + context = gtk_widget_get_style_context (widget); + gd_two_lines_renderer_prepare_layouts (self, cell_area, widget, &layout_one, &layout_two); + gd_two_lines_renderer_get_size (cell, widget, + layout_one, layout_two, + NULL, NULL, + cell_area, + &x_offset_1, &x_offset_2, &y_offset); + gtk_cell_renderer_get_padding (cell, &xpad, &ypad); + + area = *cell_area; + area.x += xpad; + area.y += ypad; + + /* now render the first layout */ + pango_layout_get_pixel_extents (layout_one, NULL, &layout_rect); + + render_area = area; + render_area.x += x_offset_1 - layout_rect.x; + render_area.y += y_offset; + + gtk_render_layout (context, cr, + render_area.x, + render_area.y, + layout_one); + + /* render the second layout */ + if (layout_two != NULL) + { + pango_layout_get_pixel_size (layout_one, + NULL, &line_one_height); + + gtk_style_context_save (context); + + apply_subtitle_style_to_layout (context, layout_two, flags); + + state = gtk_cell_renderer_get_state (cell, widget, flags); + gtk_style_context_set_state (context, state); + + pango_layout_get_pixel_extents (layout_two, NULL, &layout_rect); + + render_area = area; + render_area.x += x_offset_2 - layout_rect.x; + render_area.y += y_offset + line_one_height; + + gtk_render_layout (context, cr, + render_area.x, + render_area.y, + layout_two); + + gtk_style_context_restore (context); + } + + g_clear_object (&layout_one); + g_clear_object (&layout_two); +} + +static void +gd_two_lines_renderer_get_preferred_width (GtkCellRenderer *cell, + GtkWidget *widget, + gint *minimum_size, + gint *natural_size) +{ + PangoContext *context; + PangoFontMetrics *metrics; + PangoFontDescription *font_desc; + GtkStyleContext *style_context; + gint nat_width, min_width; + gint xpad, char_width, wrap_width, text_width; + gint width_chars, ellipsize_chars; + + g_object_get (cell, + "xpad", &xpad, + "width-chars", &width_chars, + "wrap-width", &wrap_width, + NULL); + style_context = gtk_widget_get_style_context (widget); + gtk_cell_renderer_get_padding (cell, &xpad, NULL); + + gd_two_lines_renderer_get_size (cell, widget, + NULL, NULL, + &text_width, NULL, + NULL, + NULL, NULL, NULL); + + /* Fetch the average size of a character */ + context = gtk_widget_get_pango_context (widget); + gtk_style_context_save (style_context); + gtk_style_context_set_state (style_context, 0); + gtk_style_context_get (style_context, gtk_style_context_get_state (style_context), + "font", &font_desc, NULL); + gtk_style_context_restore (style_context); + metrics = pango_context_get_metrics (context, font_desc, + pango_context_get_language (context)); + + char_width = pango_font_metrics_get_approximate_char_width (metrics); + + pango_font_metrics_unref (metrics); + pango_font_description_free (font_desc); + + /* enforce minimum width for ellipsized labels at ~3 chars */ + ellipsize_chars = 3; + + /* If no width-chars set, minimum for wrapping text will be the wrap-width */ + if (wrap_width > -1) + min_width = xpad * 2 + MIN (text_width, wrap_width); + else + min_width = xpad * 2 + + MIN (text_width, + (PANGO_PIXELS (char_width) * MAX (width_chars, ellipsize_chars))); + + if (width_chars > 0) + nat_width = xpad * 2 + + MAX ((PANGO_PIXELS (char_width) * width_chars), text_width); + else + nat_width = xpad * 2 + text_width; + + nat_width = MAX (nat_width, min_width); + + if (minimum_size) + *minimum_size = min_width; + + if (natural_size) + *natural_size = nat_width; +} + +static void +gd_two_lines_renderer_get_preferred_height_for_width (GtkCellRenderer *cell, + GtkWidget *widget, + gint width, + gint *minimum_size, + gint *natural_size) +{ + GdTwoLinesRenderer *self = GD_TWO_LINES_RENDERER (cell); + PangoLayout *layout_one, *layout_two; + gint text_height, wrap_width; + gint xpad, ypad; + + gtk_cell_renderer_get_padding (cell, &xpad, &ypad); + g_object_get (cell, "wrap-width", &wrap_width, NULL); + gd_two_lines_renderer_prepare_layouts (self, NULL, widget, &layout_one, &layout_two); + + if (wrap_width != -1) + wrap_width = MIN (width - 2 * xpad, wrap_width); + else + wrap_width = width - 2 * xpad; + + pango_layout_set_width (layout_one, wrap_width); + if (layout_two != NULL) + pango_layout_set_width (layout_two, wrap_width); + + gd_two_lines_renderer_get_size (cell, widget, + layout_one, layout_two, + NULL, &text_height, + NULL, + NULL, NULL, NULL); + + text_height += 2 * ypad; + + if (minimum_size != NULL) + *minimum_size = text_height; + + if (natural_size != NULL) + *natural_size = text_height; + + g_clear_object (&layout_one); + g_clear_object (&layout_two); +} + +static void +gd_two_lines_renderer_get_preferred_height (GtkCellRenderer *cell, + GtkWidget *widget, + gint *minimum_size, + gint *natural_size) +{ + gint min_width; + + gtk_cell_renderer_get_preferred_width (cell, widget, &min_width, NULL); + gd_two_lines_renderer_get_preferred_height_for_width (cell, widget, min_width, + minimum_size, natural_size); +} + +static void +gd_two_lines_renderer_get_aligned_area (GtkCellRenderer *cell, + GtkWidget *widget, + GtkCellRendererState flags, + const GdkRectangle *cell_area, + GdkRectangle *aligned_area) +{ + gint x_offset, x_offset_1, x_offset_2, y_offset; + + /* fetch common information */ + gd_two_lines_renderer_get_size (cell, widget, + NULL, NULL, + &aligned_area->width, &aligned_area->height, + cell_area, + &x_offset_1, &x_offset_2, &y_offset); + + x_offset = MIN (x_offset_1, x_offset_2); + + aligned_area->x = cell_area->x + x_offset; + aligned_area->y = cell_area->y + y_offset; +} + +static void +gd_two_lines_renderer_set_line_two (GdTwoLinesRenderer *self, + const gchar *line_two) +{ + GdTwoLinesRendererPrivate *priv; + + priv = gd_two_lines_renderer_get_instance_private (self); + + if (g_strcmp0 (priv->line_two, line_two) == 0) + return; + + g_free (priv->line_two); + priv->line_two = g_strdup (line_two); + + g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_LINE_TWO]); +} + +static void +gd_two_lines_renderer_set_text_lines (GdTwoLinesRenderer *self, + gint text_lines) +{ + GdTwoLinesRendererPrivate *priv; + + priv = gd_two_lines_renderer_get_instance_private (self); + + if (priv->text_lines == text_lines) + return; + + priv->text_lines = text_lines; + g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_TEXT_LINES]); +} + +static void +gd_two_lines_renderer_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + GdTwoLinesRenderer *self = GD_TWO_LINES_RENDERER (object); + + switch (property_id) + { + case PROP_TEXT_LINES: + gd_two_lines_renderer_set_text_lines (self, g_value_get_int (value)); + break; + case PROP_LINE_TWO: + gd_two_lines_renderer_set_line_two (self, g_value_get_string (value)); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gd_two_lines_renderer_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + GdTwoLinesRenderer *self = GD_TWO_LINES_RENDERER (object); + GdTwoLinesRendererPrivate *priv; + + priv = gd_two_lines_renderer_get_instance_private (self); + + switch (property_id) + { + case PROP_TEXT_LINES: + g_value_set_int (value, priv->text_lines); + break; + case PROP_LINE_TWO: + g_value_set_string (value, priv->line_two); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gd_two_lines_renderer_finalize (GObject *object) +{ + GdTwoLinesRenderer *self = GD_TWO_LINES_RENDERER (object); + GdTwoLinesRendererPrivate *priv; + + priv = gd_two_lines_renderer_get_instance_private (self); + + g_free (priv->line_two); + + G_OBJECT_CLASS (gd_two_lines_renderer_parent_class)->finalize (object); +} + +static void +gd_two_lines_renderer_class_init (GdTwoLinesRendererClass *klass) +{ + GtkCellRendererClass *cclass = GTK_CELL_RENDERER_CLASS (klass); + GObjectClass *oclass = G_OBJECT_CLASS (klass); + + cclass->render = gd_two_lines_renderer_render; + cclass->get_preferred_width = gd_two_lines_renderer_get_preferred_width; + cclass->get_preferred_height = gd_two_lines_renderer_get_preferred_height; + cclass->get_preferred_height_for_width = gd_two_lines_renderer_get_preferred_height_for_width; + cclass->get_aligned_area = gd_two_lines_renderer_get_aligned_area; + + oclass->set_property = gd_two_lines_renderer_set_property; + oclass->get_property = gd_two_lines_renderer_get_property; + oclass->finalize = gd_two_lines_renderer_finalize; + + properties[PROP_TEXT_LINES] = + g_param_spec_int ("text-lines", + "Lines of text", + "The total number of lines to be displayed", + 2, G_MAXINT, 2, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS); + + properties[PROP_LINE_TWO] = + g_param_spec_string ("line-two", + "Second line", + "Second line", + NULL, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS); + + g_object_class_install_properties (oclass, NUM_PROPERTIES, properties); +} + +static void +gd_two_lines_renderer_init (GdTwoLinesRenderer *self) +{ +} + +GtkCellRenderer * +gd_two_lines_renderer_new (void) +{ + return g_object_new (GD_TYPE_TWO_LINES_RENDERER, NULL); +} |