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livetrax/libs/gtkmm2ext/cairocell.cc

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/*
Copyright (C) 2011 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <algorithm>
#include <cmath>
#include <iostream>
#include "gtkmm2ext/cairocell.h"
#include "gtkmm2ext/utils.h"
using std::string;
using std::map;
using std::max;
using std::cerr;
using std::endl;
using namespace Gtkmm2ext;
static const double cairo_font_fudge = 1.5;
CairoFontDescription::CairoFontDescription (Pango::FontDescription& fd)
{
_size = cairo_font_fudge * (fd.get_size() / PANGO_SCALE);
switch (fd.get_style()) {
case Pango::STYLE_NORMAL:
_slant = Cairo::FONT_SLANT_NORMAL;
break;
case Pango::STYLE_OBLIQUE:
_slant = Cairo::FONT_SLANT_OBLIQUE;
break;
case Pango::STYLE_ITALIC:
_slant = Cairo::FONT_SLANT_ITALIC;
break;
}
switch (fd.get_weight()) {
case Pango::WEIGHT_ULTRALIGHT:
_weight = Cairo::FONT_WEIGHT_NORMAL;
break;
case Pango::WEIGHT_LIGHT:
_weight = Cairo::FONT_WEIGHT_NORMAL;
break;
case Pango::WEIGHT_NORMAL:
_weight = Cairo::FONT_WEIGHT_NORMAL;
break;
case Pango::WEIGHT_SEMIBOLD:
_weight = Cairo::FONT_WEIGHT_BOLD;
break;
case Pango::WEIGHT_BOLD:
_weight = Cairo::FONT_WEIGHT_BOLD;
break;
case Pango::WEIGHT_ULTRABOLD:
_weight = Cairo::FONT_WEIGHT_BOLD;
break;
case Pango::WEIGHT_HEAVY:
_weight = Cairo::FONT_WEIGHT_BOLD;
break;
}
face = fd.get_family();
}
CairoCell::CairoCell (int32_t id)
: _id (id)
, _visible (true)
, _xpad (0)
{
bbox.x = 0;
bbox.y = 0;
bbox.width = 0;
bbox.height = 0;
}
CairoTextCell::CairoTextCell (int32_t id, double wc, boost::shared_ptr<CairoFontDescription> font)
: CairoCell (id)
, _width_chars (wc)
, _font (font)
, y_offset (0)
, x_offset (0)
{
}
void
CairoTextCell::set_text (const std::string& txt)
{
_text = txt;
}
void
CairoTextCell::render (Cairo::RefPtr<Cairo::Context>& context)
{
if (!_visible || _width_chars == 0) {
return;
}
context->save ();
context->rectangle (bbox.x, bbox.y, bbox.width, bbox.height);
context->clip ();
_font->apply (context);
context->move_to (bbox.x, bbox.y + bbox.height + y_offset);
context->show_text (_text);
context->restore ();
}
void
CairoTextCell::set_size (Cairo::RefPtr<Cairo::Context>& context)
{
const uint32_t lim = (uint32_t) ceil (_width_chars);
char buf[lim+1];
uint32_t n;
double max_width = 0.0;
double max_height = 0.0;
Cairo::TextExtents ext;
double bsum = 0;
buf[lim] = '\0';
_font->apply (context);
for (int digit = 0; digit < 10; digit++) {
for (n = 0; n < lim; ++n) {
buf[n] = '0' + digit;
}
context->get_text_extents (buf, ext);
max_width = max (ext.width + ext.x_bearing, max_width);
max_height = max (ext.height, max_height);
bsum += ext.x_bearing;
}
/* add the average x-bearing for all digits as right hand side padding */
bbox.width = max_width + (bsum/10.0);
/* some fonts and some digits get their extents computed "too small", so fudge this
by adding 2
*/
bbox.height = max_height;
}
CairoCharCell::CairoCharCell (int32_t id, char c)
: CairoTextCell (id, 1)
{
_text = c;
}
void
CairoCharCell::set_size (Cairo::RefPtr<Cairo::Context>& context)
{
Cairo::TextExtents ext;
_font->apply (context);
{
const char* buf = "8";
context->get_text_extents (buf, ext);
/* same height as an "8" */
bbox.height = ext.height;
}
{
const char* buf = ":";
context->get_text_extents (buf, ext);
bbox.width = ext.width + (2.0 * ext.x_bearing);
/* center vertically */
y_offset = (ext.height - bbox.height) / 2.0;
}
}
CairoEditableText::CairoEditableText (boost::shared_ptr<CairoFontDescription> font)
: editing_cell (0)
, _draw_bg (true)
, max_cell_width (0)
, max_cell_height (0)
, _corner_radius (9)
, _xpad (0)
, _ypad (0)
{
set_font (font);
add_events (Gdk::POINTER_MOTION_HINT_MASK | Gdk::SCROLL_MASK | Gdk::KEY_PRESS_MASK | Gdk::KEY_RELEASE_MASK |
Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::SCROLL_MASK);
set_flags (Gtk::CAN_FOCUS);
set_can_default (true);
set_receives_default (true);
}
CairoEditableText::~CairoEditableText ()
{
/* we don't own cells */
}
bool
CairoEditableText::on_scroll_event (GdkEventScroll* ev)
{
CairoCell* cell = find_cell (ev->x, ev->y);
if (cell) {
return scroll (ev, cell);
}
return false;
}
bool
CairoEditableText::on_focus_in_event (GdkEventFocus*)
{
return false;
}
bool
CairoEditableText::on_focus_out_event (GdkEventFocus*)
{
if (editing_cell) {
queue_draw_cell (editing_cell);
editing_cell = 0;
}
return false;
}
void
CairoEditableText::add_cell (CairoCell* cell)
{
cells.push_back (cell);
CairoTextCell* tc = dynamic_cast<CairoTextCell*>(cell);
if (tc) {
tc->set_font (_font);
}
queue_resize ();
}
void
CairoEditableText::clear_cells ()
{
cells.clear ();
queue_resize ();
}
void
CairoEditableText::set_width_chars (CairoTextCell* cell, uint32_t wc)
{
if (cell) {
cell->set_width_chars (wc);
queue_resize ();
}
}
void
CairoEditableText::set_text (CairoTextCell* cell, const string& text)
{
cell->set_text (text);
queue_draw_cell (cell);
}
bool
CairoEditableText::on_expose_event (GdkEventExpose* ev)
{
Glib::RefPtr<Gdk::Window> win = get_window ();
if (!win) {
std::cerr << "CET: no window to draw on\n";
return false;
}
Cairo::RefPtr<Cairo::Context> context = win->create_cairo_context();
if (cells.empty()) {
return true;
}
context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
context->clip ();
Gtk::Allocation alloc = get_allocation ();
double width = alloc.get_width();
double height = alloc.get_height ();
if (_draw_bg) {
context->set_source_rgba (bg_r, bg_g, bg_b, bg_a);
if (_corner_radius) {
rounded_rectangle (context, 0, 0, width, height, _corner_radius);
} else {
context->rectangle (0, 0, width, height);
}
context->fill ();
}
for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
CairoCell* cell = (*i);
/* is cell inside the expose area?
*/
if (cell->intersects (ev->area)) {
if (cell == editing_cell) {
context->set_source_rgba (edit_r, edit_b, edit_g, edit_a);
} else {
context->set_source_rgba (r, g, b, a);
}
cell->render (context);
}
}
return true;
}
void
CairoEditableText::queue_draw_cell (CairoCell* cell)
{
Glib::RefPtr<Gdk::Window> win = get_window();
if (!win) {
return;
}
Gdk::Rectangle r;
r.set_x (cell->x());
r.set_y (cell->y());
r.set_width (cell->width());
r.set_height (cell->height());
Gdk::Region rg (r);
win->invalidate_region (rg, true);
}
CairoCell*
CairoEditableText::find_cell (uint32_t x, uint32_t y)
{
for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
if ((*i)->covers (x, y)) {
return (*i);
}
}
return 0;
}
bool
CairoEditableText::on_button_press_event (GdkEventButton* ev)
{
CairoCell* cell = find_cell (ev->x, ev->y);
return button_press (ev, cell);
}
bool
CairoEditableText::on_button_release_event (GdkEventButton* ev)
{
CairoCell* cell = find_cell (ev->x, ev->y);
return button_release (ev, cell);
}
void
CairoEditableText::start_editing (CairoCell* cell)
{
stop_editing ();
if (cell) {
editing_cell = cell;
queue_draw_cell (cell);
grab_focus ();
}
}
void
CairoEditableText::stop_editing ()
{
if (editing_cell) {
queue_draw_cell (editing_cell);
editing_cell = 0;
}
}
void
CairoEditableText::set_cell_sizes ()
{
Glib::RefPtr<Gdk::Window> win = get_window();
if (!win) {
return;
}
Cairo::RefPtr<Cairo::Context> context = win->create_cairo_context();
if (!context) {
return;
}
for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
(*i)->set_size (context);
}
}
void
CairoEditableText::on_size_request (GtkRequisition* req)
{
set_cell_sizes ();
max_cell_width = 0;
max_cell_height = 0;
for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
max_cell_width += (*i)->width();
max_cell_height = std::max ((double) (*i)->height(), max_cell_height);
}
req->width = max_cell_width;
req->height = max_cell_height;
}
void
CairoEditableText::on_size_allocate (Gtk::Allocation& alloc)
{
Misc::on_size_allocate (alloc);
/* position each cell so that its centered in the allocated space
*/
double x = (alloc.get_width() - max_cell_width)/2.0;
double y = (alloc.get_height() - max_cell_height)/2.0;
CellMap::iterator i = cells.begin();
while (i != cells.end()) {
CairoCell* cell = (*i);
cell->set_position (x, y);
x += cell->width ();
if (++i != cells.end()) {
/* only add cell padding intra-cellularly */
x += cell->xpad();
} else {
break;
}
}
}
void
CairoEditableText::set_font (Pango::FontDescription& fd)
{
boost::shared_ptr<CairoFontDescription> cd (new CairoFontDescription (fd));
set_font (cd);
}
void
CairoEditableText::set_font (boost::shared_ptr<CairoFontDescription> fd)
{
for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
CairoTextCell* tc = dynamic_cast<CairoTextCell*>(*i);
if (tc && (!tc->font() || tc->font() == _font)) {
tc->set_font (fd);
}
}
_font = fd;
queue_resize ();
queue_draw ();
}