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livetrax/libs/canvas/canvas.cc

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/*
Copyright (C) 2011 Paul Davis
Author: Carl Hetherington <cth@carlh.net>
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.
*/
/** @file canvas/canvas.cc
* @brief Implementation of the main canvas classes.
*/
#include <cassert>
#include <gtkmm/adjustment.h>
#include <gtkmm/label.h>
#include "pbd/compose.h"
#include "pbd/stacktrace.h"
#include "canvas/canvas.h"
#include "canvas/debug.h"
using namespace std;
using namespace ArdourCanvas;
/** Construct a new Canvas */
Canvas::Canvas ()
: _root (this)
, _log_renders (true)
, _scroll_offset_x (0)
, _scroll_offset_y (0)
{
set_epoch ();
}
void
Canvas::scroll_to (Coord x, Coord y)
{
_scroll_offset_x = x;
_scroll_offset_y = y;
}
/** Render an area of the canvas.
* @param area Area in canvas coordinates.
* @param context Cairo context to render to.
*/
void
Canvas::render (Rect const & area, Cairo::RefPtr<Cairo::Context> const & context) const
{
#ifdef CANVAS_DEBUG
if (DEBUG_ENABLED(PBD::DEBUG::CanvasRender)) {
cerr << "CANVAS @ " << this << endl;
dump (cerr);
cerr << "-------------------------\n";
}
#endif
// checkpoint ("render", "-> render");
render_count = 0;
context->save ();
/* clip to the requested area */
context->rectangle (area.x0, area.y0, area.width(), area.height());
context->clip ();
boost::optional<Rect> root_bbox = _root.bounding_box();
if (!root_bbox) {
/* the root has no bounding box, so there's nothing to render */
// checkpoint ("render", "no root bbox");
context->restore ();
return;
}
boost::optional<Rect> draw = root_bbox.get().intersection (area);
if (draw) {
/* there's a common area between the root and the requested
area, so render it.
*/
// checkpoint ("render", "... root");
context->stroke ();
_root.render (*draw, context);
}
if (_log_renders) {
_renders.push_back (area);
}
context->restore ();
#ifdef CANVAS_DEBUG
if (getenv ("ARDOUR_HARLEQUIN_CANVAS")) {
/* light up the canvas to show redraws */
context->set_source_rgba (random()%255 / 255.0,
random()%255 / 255.0,
random()%255 / 255.0,
255);
context->rectangle (area.x0, area.y0, area.width(), area.height());
context->fill ();
}
#endif
// checkpoint ("render", "<- render");
}
ostream&
operator<< (ostream& o, Canvas& c)
{
c.dump (o);
return o;
}
std::string
Canvas::indent() const
{
string s;
for (int n = 0; n < ArdourCanvas::dump_depth; ++n) {
s += '\t';
}
return s;
}
std::string
Canvas::render_indent() const
{
string s;
for (int n = 0; n < ArdourCanvas::render_depth; ++n) {
s += ' ';
}
return s;
}
void
Canvas::dump (ostream& o) const
{
dump_depth = 0;
_root.dump (o);
}
/** Called when an item has been shown or hidden.
* @param item Item that has been shown or hidden.
*/
void
Canvas::item_shown_or_hidden (Item* item)
{
boost::optional<Rect> bbox = item->bounding_box ();
if (bbox) {
queue_draw_item_area (item, bbox.get ());
}
}
/** Called when an item has changed, but not moved.
* @param item Item that has changed.
* @param pre_change_bounding_box The bounding box of item before the change,
* in the item's coordinates.
*/
void
Canvas::item_changed (Item* item, boost::optional<Rect> pre_change_bounding_box)
{
if (pre_change_bounding_box) {
/* request a redraw of the item's old bounding box */
queue_draw_item_area (item, pre_change_bounding_box.get ());
}
boost::optional<Rect> post_change_bounding_box = item->bounding_box ();
if (post_change_bounding_box) {
/* request a redraw of the item's new bounding box */
queue_draw_item_area (item, post_change_bounding_box.get ());
}
}
/** Called when an item has moved.
* @param item Item that has moved.
* @param pre_change_parent_bounding_box The bounding box of the item before
* the move, in its parent's coordinates.
*/
void
Canvas::item_moved (Item* item, boost::optional<Rect> pre_change_parent_bounding_box)
{
if (pre_change_parent_bounding_box) {
/* request a redraw of where the item used to be. The box has
* to be in parent coordinate space since the bounding box of
* an item does not change when moved. If we use
* item->item_to_canvas() on the old bounding box, we will be
* using the item's new position, and so will compute the wrong
* invalidation area. If we use the parent (which has not
* moved, then this will work.
*/
queue_draw_item_area (item->parent(), pre_change_parent_bounding_box.get ());
}
boost::optional<Rect> post_change_bounding_box = item->bounding_box ();
if (post_change_bounding_box) {
/* request a redraw of where the item now is */
queue_draw_item_area (item, post_change_bounding_box.get ());
}
}
/** Request a redraw of a particular area in an item's coordinates.
* @param item Item.
* @param area Area to redraw in the item's coordinates.
*/
void
Canvas::queue_draw_item_area (Item* item, Rect area)
{
ArdourCanvas::Rect canvas_area = item->item_to_canvas (area);
// cerr << "CANVAS Invalidate " << area << " TRANSLATE AS " << canvas_area << endl;
request_redraw (canvas_area);
}
/** Construct a GtkCanvas */
GtkCanvas::GtkCanvas ()
: _current_item (0)
, _grabbed_item (0)
{
/* these are the events we want to know about */
add_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::POINTER_MOTION_MASK);
}
/** Handler for button presses on the canvas.
* @param ev GDK event.
*/
bool
GtkCanvas::button_handler (GdkEventButton* ev)
{
DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas button %3 %1 %1\n", ev->x, ev->y, (ev->type == GDK_BUTTON_PRESS ? "press" : "release")));
/* The Duple that we are passing in here is in canvas coordinates */
return deliver_event (Duple (ev->x, ev->y), reinterpret_cast<GdkEvent*> (ev));
}
/** Handler for pointer motion events on the canvas.
* @param ev GDK event.
* @return true if the motion event was handled, otherwise false.
*/
bool
GtkCanvas::motion_notify_handler (GdkEventMotion* ev)
{
if (_grabbed_item) {
/* if we have a grabbed item, it gets just the motion event,
since no enter/leave events can have happened.
*/
DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 %2 (%3) was grabbed, send MOTION event there\n",
_grabbed_item, _grabbed_item->whatami(), _grabbed_item->name));
return _grabbed_item->Event (reinterpret_cast<GdkEvent*> (ev));
}
/* This is in canvas coordinates */
Duple point (ev->x, ev->y);
/* find the items at the new mouse position */
vector<Item const *> items;
_root.add_items_at_point (point, items);
Item const * new_item = items.empty() ? 0 : items.back ();
if (_current_item && _current_item != new_item) {
/* leave event */
GdkEventCrossing leave_event;
leave_event.type = GDK_LEAVE_NOTIFY;
leave_event.x = ev->x;
leave_event.y = ev->y;
_current_item->Event (reinterpret_cast<GdkEvent*> (&leave_event));
}
if (new_item && _current_item != new_item) {
/* enter event */
GdkEventCrossing enter_event;
enter_event.type = GDK_ENTER_NOTIFY;
enter_event.x = ev->x;
enter_event.y = ev->y;
new_item->Event (reinterpret_cast<GdkEvent*> (&enter_event));
}
_current_item = new_item;
/* Now deliver the motion event. It may seem a little inefficient
to recompute the items under the event, but the enter notify/leave
events may have deleted canvas items so it is important to
recompute the list in deliver_event.
*/
return deliver_event (point, reinterpret_cast<GdkEvent*> (ev));
}
/** Deliver an event to the appropriate item; either the grabbed item, or
* one of the items underneath the event.
* @param point Position that the event has occurred at, in canvas coordinates.
* @param event The event.
*/
bool
GtkCanvas::deliver_event (Duple point, GdkEvent* event)
{
if (_grabbed_item) {
/* we have a grabbed item, so everything gets sent there */
DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 %2 (%3) was grabbed, send event there\n",
_grabbed_item, _grabbed_item->whatami(), _grabbed_item->name));
return _grabbed_item->Event (event);
}
/* find the items that exist at the event's position */
vector<Item const *> items;
_root.add_items_at_point (point, items);
DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("%1 possible items to deliver event to\n", items.size()));
/* run through the items under the event, from top to bottom, until one claims the event */
vector<Item const *>::const_reverse_iterator i = items.rbegin ();
while (i != items.rend()) {
if ((*i)->ignore_events ()) {
DEBUG_TRACE (
PBD::DEBUG::CanvasEvents,
string_compose ("canvas event ignored by %1 %2\n", (*i)->whatami(), (*i)->name.empty() ? "[unknown]" : (*i)->name)
);
++i;
continue;
}
if ((*i)->Event (event)) {
/* this item has just handled the event */
DEBUG_TRACE (
PBD::DEBUG::CanvasEvents,
string_compose ("canvas event handled by %1 %2\n", (*i)->whatami(), (*i)->name.empty() ? "[unknown]" : (*i)->name)
);
return true;
}
DEBUG_TRACE (
PBD::DEBUG::CanvasEvents,
string_compose ("canvas event left unhandled by %1 %2\n", (*i)->whatami(), (*i)->name.empty() ? "[unknown]" : (*i)->name)
);
++i;
}
/* debugging */
if (PBD::debug_bits & PBD::DEBUG::CanvasEvents) {
while (i != items.rend()) {
DEBUG_TRACE (PBD::DEBUG::CanvasEvents, string_compose ("canvas event not seen by %1\n", (*i)->name.empty() ? "[unknown]" : (*i)->name));
++i;
}
}
return false;
}
/** Called when an item is being destroyed.
* @param item Item being destroyed.
* @param bounding_box Last known bounding box of the item.
*/
void
GtkCanvas::item_going_away (Item* item, boost::optional<Rect> bounding_box)
{
if (bounding_box) {
queue_draw_item_area (item, bounding_box.get ());
}
if (_current_item == item) {
_current_item = 0;
}
if (_grabbed_item == item) {
_grabbed_item = 0;
}
}
/** Handler for GDK expose events.
* @param ev Event.
* @return true if the event was handled.
*/
bool
GtkCanvas::on_expose_event (GdkEventExpose* ev)
{
Cairo::RefPtr<Cairo::Context> c = get_window()->create_cairo_context ();
/* WINDOW CANVAS
* 0,0 _scroll_offset_x, _scroll_offset_y
*/
/* render using canvas coordinates */
Rect canvas_area (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height);
canvas_area = canvas_area.translate (Duple (_scroll_offset_x, _scroll_offset_y));
/* things are going to render to the cairo surface with canvas
* coordinates:
*
* an item at window/cairo 0,0 will have canvas_coords _scroll_offset_x,_scroll_offset_y
*
* let them render at their natural coordinates by using cairo_translate()
*/
c->translate (-_scroll_offset_x, -_scroll_offset_y);
render (canvas_area, c);
return true;
}
/** @return Our Cairo context, or 0 if we don't have one */
Cairo::RefPtr<Cairo::Context>
GtkCanvas::context ()
{
Glib::RefPtr<Gdk::Window> w = get_window ();
if (!w) {
return Cairo::RefPtr<Cairo::Context> ();
}
return w->create_cairo_context ();
}
/** Handler for GDK button press events.
* @param ev Event.
* @return true if the event was handled.
*/
bool
GtkCanvas::on_button_press_event (GdkEventButton* ev)
{
/* translate event coordinates from window to canvas */
GdkEvent copy = *((GdkEvent*)ev);
Duple where = window_to_canvas (Duple (ev->x, ev->y));
copy.button.x = where.x;
copy.button.y = where.y;
/* Coordinates in the event will be canvas coordinates, correctly adjusted
for scroll if this GtkCanvas is in a GtkCanvasViewport.
*/
return button_handler ((GdkEventButton*) &copy);
}
/** Handler for GDK button release events.
* @param ev Event.
* @return true if the event was handled.
*/
bool
GtkCanvas::on_button_release_event (GdkEventButton* ev)
{
/* translate event coordinates from window to canvas */
GdkEvent copy = *((GdkEvent*)ev);
Duple where = window_to_canvas (Duple (ev->x, ev->y));
copy.button.x = where.x;
copy.button.y = where.y;
/* Coordinates in the event will be canvas coordinates, correctly adjusted
for scroll if this GtkCanvas is in a GtkCanvasViewport.
*/
return button_handler ((GdkEventButton*) &copy);
}
/** Handler for GDK motion events.
* @param ev Event.
* @return true if the event was handled.
*/
bool
GtkCanvas::on_motion_notify_event (GdkEventMotion* ev)
{
/* translate event coordinates from window to canvas */
GdkEvent copy = *((GdkEvent*)ev);
Duple where = window_to_canvas (Duple (ev->x, ev->y));
copy.motion.x = where.x;
copy.motion.y = where.y;
/* Coordinates in the event will be canvas coordinates, correctly adjusted
for scroll if this GtkCanvas is in a GtkCanvasViewport.
*/
return motion_notify_handler ((GdkEventMotion*) &copy);
}
/** Called to request a redraw of our canvas.
* @param area Area to redraw, in canvas coordinates.
*/
void
GtkCanvas::request_redraw (Rect const & request)
{
Rect area = canvas_to_window (request);
// cerr << "Invalidate " << request << " TRANSLATE AS " << area << endl;
queue_draw_area (floor (area.x0), floor (area.y0), ceil (area.x1) - floor (area.x0), ceil (area.y1) - floor (area.y0));
}
/** Called to request that we try to get a particular size for ourselves.
* @param size Size to request, in pixels.
*/
void
GtkCanvas::request_size (Duple size)
{
Duple req = size;
if (req.x > INT_MAX) {
req.x = INT_MAX;
}
if (req.y > INT_MAX) {
req.y = INT_MAX;
}
set_size_request (req.x, req.y);
}
/** `Grab' an item, so that all events are sent to that item until it is `ungrabbed'.
* This is typically used for dragging items around, so that they are grabbed during
* the drag.
* @param item Item to grab.
*/
void
GtkCanvas::grab (Item* item)
{
/* XXX: should this be doing gdk_pointer_grab? */
_grabbed_item = item;
}
/** `Ungrab' any item that was previously grabbed */
void
GtkCanvas::ungrab ()
{
/* XXX: should this be doing gdk_pointer_ungrab? */
_grabbed_item = 0;
}
/** Create a GtkCanvaSViewport.
* @param hadj Adjustment to use for horizontal scrolling.
* @param vadj Adjustment to use for vertica scrolling.
*/
GtkCanvasViewport::GtkCanvasViewport (Gtk::Adjustment& hadj, Gtk::Adjustment& vadj)
: Alignment (0, 0, 1.0, 1.0)
, hadjustment (hadj)
, vadjustment (vadj)
{
add (_canvas);
hadj.signal_value_changed().connect (sigc::mem_fun (*this, &GtkCanvasViewport::scrolled));
vadj.signal_value_changed().connect (sigc::mem_fun (*this, &GtkCanvasViewport::scrolled));
}
void
GtkCanvasViewport::scrolled ()
{
_canvas.scroll_to (hadjustment.get_value(), vadjustment.get_value());
queue_draw ();
}
Duple
GtkCanvas::window_to_canvas (Duple const & d) const
{
return d.translate (Duple (_scroll_offset_x, _scroll_offset_y));
}
Duple
GtkCanvas::canvas_to_window (Duple const & d) const
{
return d.translate (Duple (-_scroll_offset_x, -_scroll_offset_y));
}
Rect
GtkCanvas::window_to_canvas (Rect const & r) const
{
return r.translate (Duple (_scroll_offset_x, _scroll_offset_y));
}
Rect
GtkCanvas::canvas_to_window (Rect const & r) const
{
return r.translate (Duple (-_scroll_offset_x, -_scroll_offset_y));
}
/** Handler for when GTK asks us what minimum size we want.
* @param req Requsition to fill in.
*/
void
GtkCanvasViewport::on_size_request (Gtk::Requisition* req)
{
/* force the canvas to size itself */
// _canvas.root()->bounding_box();
req->width = 16;
req->height = 16;
}
/** Convert window coordinates to canvas coordinates by taking into account
* where we are scrolled to.
* @param wx Window x.
* @param wy Window y.
* @param cx Filled in with canvas x.
* @param cy Filled in with canvas y.
*/
void
GtkCanvasViewport::window_to_canvas (int wx, int wy, Coord& cx, Coord& cy) const
{
Duple d = _canvas.window_to_canvas (Duple (wx, wy));
cx = d.x;
cy = d.y;
}
/** @return The visible area of the canvas, in canvas coordinates */
Rect
GtkCanvasViewport::visible_area () const
{
Distance const xo = hadjustment.get_value ();
Distance const yo = vadjustment.get_value ();
return Rect (xo, yo, xo + get_allocation().get_width (), yo + get_allocation().get_height ());
}