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Copyright (C) 2011 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include "gtkmm2ext/cairocell.h"
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#include "gtkmm2ext/utils.h"
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using namespace Gtkmm2ext;
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static const double cairo_font_fudge = 1.5;
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CairoFontDescription::CairoFontDescription (Pango::FontDescription& fd)
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_size = cairo_font_fudge * (fd.get_size() / PANGO_SCALE);
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switch (fd.get_style()) {
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case Pango::STYLE_NORMAL:
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_slant = Cairo::FONT_SLANT_NORMAL;
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case Pango::STYLE_OBLIQUE:
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_slant = Cairo::FONT_SLANT_OBLIQUE;
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case Pango::STYLE_ITALIC:
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_slant = Cairo::FONT_SLANT_ITALIC;
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switch (fd.get_weight()) {
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case Pango::WEIGHT_ULTRALIGHT:
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_weight = Cairo::FONT_WEIGHT_NORMAL;
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case Pango::WEIGHT_LIGHT:
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_weight = Cairo::FONT_WEIGHT_NORMAL;
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case Pango::WEIGHT_NORMAL:
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_weight = Cairo::FONT_WEIGHT_NORMAL;
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case Pango::WEIGHT_SEMIBOLD:
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_weight = Cairo::FONT_WEIGHT_BOLD;
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case Pango::WEIGHT_BOLD:
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_weight = Cairo::FONT_WEIGHT_BOLD;
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case Pango::WEIGHT_ULTRABOLD:
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_weight = Cairo::FONT_WEIGHT_BOLD;
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case Pango::WEIGHT_HEAVY:
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_weight = Cairo::FONT_WEIGHT_BOLD;
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face = fd.get_family();
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CairoCell::CairoCell (int32_t id)
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CairoTextCell::CairoTextCell (int32_t id, double wc, boost::shared_ptr<CairoFontDescription> font)
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CairoTextCell::set_text (const std::string& txt)
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CairoTextCell::render (Cairo::RefPtr<Cairo::Context>& context)
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if (!_visible || _width_chars == 0) {
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context->rectangle (bbox.x, bbox.y, bbox.width, bbox.height);
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_font->apply (context);
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context->move_to (bbox.x, bbox.y + bbox.height + y_offset);
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context->show_text (_text);
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CairoTextCell::set_size (Cairo::RefPtr<Cairo::Context>& context)
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const uint32_t lim = (uint32_t) ceil (_width_chars);
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double max_width = 0.0;
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double max_height = 0.0;
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Cairo::TextExtents ext;
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_font->apply (context);
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for (int digit = 0; digit < 10; digit++) {
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for (n = 0; n < lim; ++n) {
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buf[n] = '0' + digit;
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context->get_text_extents (buf, ext);
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max_width = max (ext.width + ext.x_bearing, max_width);
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max_height = max (ext.height, max_height);
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bsum += ext.x_bearing;
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/* add the average x-bearing for all digits as right hand side padding */
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bbox.width = max_width + (bsum/10.0);
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/* some fonts and some digits get their extents computed "too small", so fudge this
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bbox.height = max_height;
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CairoCharCell::CairoCharCell (int32_t id, char c)
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: CairoTextCell (id, 1)
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CairoCharCell::set_size (Cairo::RefPtr<Cairo::Context>& context)
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Cairo::TextExtents ext;
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_font->apply (context);
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const char* buf = "8";
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context->get_text_extents (buf, ext);
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/* same height as an "8" */
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bbox.height = ext.height;
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const char* buf = ":";
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context->get_text_extents (buf, ext);
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bbox.width = ext.width + (2.0 * ext.x_bearing);
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/* center vertically */
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y_offset = (ext.height - bbox.height) / 2.0;
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CairoEditableText::CairoEditableText (boost::shared_ptr<CairoFontDescription> font)
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, max_cell_height (0)
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add_events (Gdk::POINTER_MOTION_HINT_MASK | Gdk::SCROLL_MASK | Gdk::KEY_PRESS_MASK | Gdk::KEY_RELEASE_MASK |
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Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::SCROLL_MASK);
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set_flags (Gtk::CAN_FOCUS);
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set_can_default (true);
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CairoEditableText::~CairoEditableText ()
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/* we don't own cells */
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CairoEditableText::on_scroll_event (GdkEventScroll* ev)
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CairoCell* cell = find_cell (ev->x, ev->y);
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return scroll (ev, cell);
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CairoEditableText::on_focus_in_event (GdkEventFocus*)
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CairoEditableText::on_focus_out_event (GdkEventFocus*)
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queue_draw_cell (editing_cell);
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CairoEditableText::add_cell (CairoCell* cell)
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cells.push_back (cell);
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CairoTextCell* tc = dynamic_cast<CairoTextCell*>(cell);
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tc->set_font (_font);
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CairoEditableText::clear_cells ()
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CairoEditableText::set_width_chars (CairoTextCell* cell, uint32_t wc)
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cell->set_width_chars (wc);
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CairoEditableText::set_text (CairoTextCell* cell, const string& text)
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cell->set_text (text);
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queue_draw_cell (cell);
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CairoEditableText::on_expose_event (GdkEventExpose* ev)
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Glib::RefPtr<Gdk::Window> win = get_window ();
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std::cerr << "CET: no window to draw on\n";
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Cairo::RefPtr<Cairo::Context> context = win->create_cairo_context();
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context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
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Gtk::Allocation alloc = get_allocation ();
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double width = alloc.get_width();
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double height = alloc.get_height ();
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context->set_source_rgba (bg_r, bg_g, bg_b, bg_a);
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if (_corner_radius) {
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rounded_rectangle (context, 0, 0, width, height, _corner_radius);
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context->rectangle (0, 0, width, height);
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for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
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CairoCell* cell = (*i);
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/* is cell inside the expose area?
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if (cell->intersects (ev->area)) {
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if (cell == editing_cell) {
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context->set_source_rgba (edit_r, edit_b, edit_g, edit_a);
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context->set_source_rgba (r, g, b, a);
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cell->render (context);
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CairoEditableText::queue_draw_cell (CairoCell* cell)
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Glib::RefPtr<Gdk::Window> win = get_window();
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r.set_width (cell->width());
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r.set_height (cell->height());
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win->invalidate_region (rg, true);
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CairoEditableText::find_cell (uint32_t x, uint32_t y)
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for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
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if ((*i)->covers (x, y)) {
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CairoEditableText::on_button_press_event (GdkEventButton* ev)
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CairoCell* cell = find_cell (ev->x, ev->y);
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return button_press (ev, cell);
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CairoEditableText::on_button_release_event (GdkEventButton* ev)
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CairoCell* cell = find_cell (ev->x, ev->y);
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return button_release (ev, cell);
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CairoEditableText::start_editing (CairoCell* cell)
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queue_draw_cell (cell);
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CairoEditableText::stop_editing ()
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queue_draw_cell (editing_cell);
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CairoEditableText::set_cell_sizes ()
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Glib::RefPtr<Gdk::Window> win = get_window();
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Cairo::RefPtr<Cairo::Context> context = win->create_cairo_context();
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for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
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(*i)->set_size (context);
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CairoEditableText::on_size_request (GtkRequisition* req)
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for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
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max_cell_width += (*i)->width();
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max_cell_height = std::max ((double) (*i)->height(), max_cell_height);
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req->width = max_cell_width;
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req->height = max_cell_height;
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CairoEditableText::on_size_allocate (Gtk::Allocation& alloc)
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Misc::on_size_allocate (alloc);
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/* position each cell so that its centered in the allocated space
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double x = (alloc.get_width() - max_cell_width)/2.0;
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double y = (alloc.get_height() - max_cell_height)/2.0;
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CellMap::iterator i = cells.begin();
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while (i != cells.end()) {
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CairoCell* cell = (*i);
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cell->set_position (x, y);
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if (++i != cells.end()) {
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/* only add cell padding intra-cellularly */
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CairoEditableText::set_font (Pango::FontDescription& fd)
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boost::shared_ptr<CairoFontDescription> cd (new CairoFontDescription (fd));
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CairoEditableText::set_font (boost::shared_ptr<CairoFontDescription> fd)
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for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
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CairoTextCell* tc = dynamic_cast<CairoTextCell*>(*i);
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if (tc && (!tc->font() || tc->font() == _font)) {