new CairoCell and related classes designed for drawing audio clocks more efficiently etc. etc.

git-svn-id: svn://localhost/ardour2/branches/3.0@9651 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 429 insertions, 0 deletions

diff --git a/libs/gtkmm2ext/cairocell.cc b/libs/gtkmm2ext/cairocell.cc
new file mode 100644
index 0000000000..f7fc7a7c07
--- /dev/null
+++ b/libs/gtkmm2ext/cairocell.cc
@@ -0,0 +1,429 @@
+/*
+    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 "gtkmm2ext/cairocell.h"
+#include "gtkmm2ext/utils.h"
+
+using std::string;
+using std::map;
+using namespace Gtkmm2ext;
+
+CairoCell::CairoCell ()
+        : _visible (true)
+        , _xpad (5)
+{
+        bbox.x = 0;
+        bbox.y = 0;
+        bbox.width = 0;
+        bbox.height = 0;
+}
+
+CairoTextCell::CairoTextCell (uint32_t wc)
+        : _width_chars (wc)
+{
+}
+
+void
+CairoTextCell::render (Cairo::RefPtr<Cairo::Context>& context)
+{
+        if (!_visible || _width_chars == 0) {
+                return;
+        }
+
+        context->move_to (bbox.x, bbox.y); 
+        pango_cairo_update_layout (context->cobj(), layout->gobj());
+        pango_cairo_show_layout (context->cobj(), layout->gobj());
+}
+
+void
+CairoTextCell::set_size (Glib::RefPtr<Pango::Context>& context, const Pango::FontDescription& font) 
+{
+        layout = Pango::Layout::create (context);
+        layout->set_font_description (font);
+
+        Pango::FontMetrics metrics = context->get_metrics (font);
+
+        bbox.width = (_width_chars * metrics.get_approximate_digit_width ()) / PANGO_SCALE;
+        bbox.height = (metrics.get_ascent() + metrics.get_descent()) / PANGO_SCALE;
+}
+
+CairoCell*
+CairoEditableText::get_cell (uint32_t id) 
+{
+        CellMap::iterator i = cells.find (id);
+        if (i == cells.end()) {
+                return 0;
+        } 
+        return i->second;
+}
+
+CairoEditableText::CairoEditableText ()
+        : editing_id (0)
+        , editing_pos (0)
+        , width (0)
+        , max_cell_height (0)
+        , height (0)
+        , corner_radius (24)
+        , xpad (10)
+        , ypad (5)
+{
+        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);
+        set_flags (Gtk::CAN_FOCUS);
+        set_can_default (true);
+        set_receives_default (true);
+}
+
+bool
+CairoEditableText::on_focus_in_event (GdkEventFocus* ev)
+{
+        return false;
+}
+
+bool
+CairoEditableText::on_focus_out_event (GdkEventFocus* ev)
+{
+        if (editing_id) {
+                CairoCell* cell = get_cell (editing_id);
+                queue_draw_cell (cell);
+                editing_id = 0;
+                editing_pos = 0;
+        }
+
+        return false;
+}
+
+void
+CairoEditableText::add_cell (uint32_t id, CairoCell* cell)
+{
+        if (id > 0) {
+                Glib::RefPtr<Pango::Context> context = get_pango_context ();
+                cell->set_size (context, font);
+
+                cells[id] = cell; /* we own it */
+        }
+}
+
+void
+CairoEditableText::set_text (uint32_t id, const string& text)
+{
+        CellMap::iterator i = cells.find (id);
+
+        if (i == cells.end()) {
+                return;
+        }
+
+        CairoTextCell* textcell = dynamic_cast<CairoTextCell*> (i->second);
+
+        if (textcell) {
+                set_text (textcell, text);
+        }
+}            
+
+void
+CairoEditableText::set_text (CairoTextCell* cell, const string& text)
+{
+        cell->set_text (text);
+        queue_draw_cell (cell);
+}
+
+bool
+CairoEditableText::on_expose_event (GdkEventExpose* ev)
+{
+        Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
+
+        if (cells.empty()) {
+                return true;
+        }
+
+	context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
+	context->clip ();
+
+        context->set_source_rgba (bg_r, bg_g, bg_b, bg_a);
+        rounded_rectangle (context, 0, 0, width, height, corner_radius);
+        context->fill ();
+
+        for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
+
+                uint32_t id = i->first;
+                CairoCell* cell = i->second;
+                
+                /* is cell inside the expose area?
+                 */
+
+                if (cell->intersects (ev->area)) {
+
+                        if (id == editing_id) {
+                                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, uint32_t& id)
+{
+        for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
+                if (i->second->covers (x, y)) {
+                        id = i->first;
+                        return i->second;
+                }
+        }
+
+        return 0;
+}
+
+bool
+CairoEditableText::on_button_press_event (GdkEventButton* ev)
+{
+        uint32_t id;         
+        CairoCell* cell;
+
+        if (editing_id) {
+                cell = get_cell (editing_id);
+                /* redraw the old cell */
+                queue_draw_cell (cell);
+        }
+                
+        cell = find_cell (ev->x, ev->y, id);
+        
+        if (!cell) {
+                editing_id = 0;
+                return false;
+        }
+
+        grab_focus ();
+        editing_id = id;
+        editing_pos = 0;
+
+        /* redraw the new cell (maybe the same as the old - no real cost) */
+        queue_draw_cell (cell);
+
+        return true;
+}
+
+bool
+CairoEditableText::on_button_release_event (GdkEventButton* ev)
+{
+        return true;
+}
+
+bool
+CairoEditableText::on_key_press_event (GdkEventKey* ev)
+{
+        if (!editing_id) {
+                return true;
+        } 
+
+        bool commit_change = false;
+
+        CairoCell* cell = get_cell (editing_id);
+
+        if (!cell) {
+                return true;
+        }
+
+        CairoTextCell* text_cell = dynamic_cast<CairoTextCell*> (cell);
+
+        if (!text_cell) {
+                return true;
+        }
+
+        string txt = text_cell->get_text ();
+
+        switch (ev->keyval) {
+        case GDK_Tab: 
+                queue_draw_cell (cell);
+                edit_next_cell ();
+                break;
+
+        case GDK_0:
+        case GDK_KP_0:
+                txt[editing_pos] = '0';
+                commit_change = true;
+                break;
+        case GDK_1:
+        case GDK_KP_1:
+                txt[editing_pos] = '1';
+                commit_change = true;
+                break;
+        case GDK_2:
+        case GDK_KP_2:
+                txt[editing_pos] = '2';
+                commit_change = true;
+                break;
+        case GDK_3:
+        case GDK_KP_3:
+                txt[editing_pos] = '3';
+                commit_change = true;
+                break;
+        case GDK_4:
+        case GDK_KP_4:
+                txt[editing_pos] = '4';
+                commit_change = true;
+                break;
+        case GDK_5:
+        case GDK_KP_5:
+                txt[editing_pos] = '5';
+                commit_change = true;
+                break;
+        case GDK_6:
+        case GDK_KP_6:
+                txt[editing_pos] = '6';
+                commit_change = true;
+                break;
+        case GDK_7:
+        case GDK_KP_7:
+                txt[editing_pos] = '7';
+                commit_change = true;
+                break;
+        case GDK_8:
+        case GDK_KP_8:
+                txt[editing_pos] = '8';
+                commit_change = true;
+                break;
+        case GDK_9:
+        case GDK_KP_9:
+                txt[editing_pos] = '9';
+                commit_change = true;
+                break;
+
+        case GDK_Right:
+                if (editing_pos < text_cell->width_chars() - 1) {
+                        editing_pos++;
+                }
+                break;
+
+        case GDK_Left:
+                if (editing_pos > 0) {
+                        editing_pos--;
+                }
+                break;
+
+        default:
+                break;
+        }
+        
+        if (commit_change) {
+                set_text (text_cell, txt);
+                
+                if (++editing_pos >= text_cell->width_chars()) {
+                        edit_next_cell ();
+                } 
+        }
+
+
+        return true;
+}
+
+void
+CairoEditableText::edit_next_cell ()
+{
+        CairoCell* next;
+        CairoTextCell* next_text;
+        uint32_t next_id = editing_id + 1;
+        
+        while (true) {
+                next = get_cell (next_id);
+
+                if (!next || !next->visible() || (next_text = dynamic_cast<CairoTextCell*> (next)) != 0) {
+                        break;
+                }
+
+                next_id += 1;
+        }
+        
+        if (next) {
+                editing_id = next_id;
+                editing_pos = 0;
+                queue_draw_cell (next_text);
+        } else {
+                editing_id = 0;
+                editing_pos = 0;
+        }
+}
+
+bool
+CairoEditableText::on_key_release_event (GdkEventKey* ev)
+{
+        return true;
+}
+
+void
+CairoEditableText::on_size_request (GtkRequisition* req)
+{
+        double x = 0;
+
+        max_cell_height = 0;
+
+        x = xpad;
+
+        for (CellMap::iterator i = cells.begin(); i != cells.end(); ++i) {
+                CairoCell* cell = i->second;
+
+                if (cell->visible()) {
+                        cell->set_position (x, ypad);
+                }
+
+                x += cell->width() + cell->xpad();
+                max_cell_height = std::max ((double) cell->height(), max_cell_height);
+        }
+
+        x += xpad;
+        
+        req->width = x;
+        req->height = max_cell_height + (ypad * 2);
+}
+
+void
+CairoEditableText::on_size_allocate (Gtk::Allocation& alloc)
+{
+        Misc::on_size_allocate (alloc);
+
+        width = alloc.get_width();
+        height = alloc.get_height();
+}