git-svn-id: svn://localhost/ardour2/branches/3.0@3859 d708f5d6-7413-0410-9779-e7cbd77b26cf
396 lines
8.7 KiB
C++
396 lines
8.7 KiB
C++
/*
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Copyright (C) 2008 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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*/
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#include <iostream>
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#include <gtkmm2ext/scroomer.h>
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using namespace Gtkmm2ext;
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using namespace Gtk;
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using namespace Gdk;
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using namespace std;
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Scroomer::Scroomer(Gtk::Adjustment& adjustment)
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: adj(adjustment)
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, handle_size(0)
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, grab_comp(None) {
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position[TopBase] = 0;
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position[Handle1] = 0;
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position[Slider] = 0;
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position[Handle2] = 0;
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position[BottomBase] = 0;
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position[Total] = 0;
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add_events (Gdk::BUTTON_PRESS_MASK |
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Gdk::BUTTON_RELEASE_MASK |
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Gdk::POINTER_MOTION_MASK |
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Gdk::SCROLL_MASK);
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adjustment.signal_value_changed().connect (mem_fun (*this, &Scroomer::adjustment_changed));
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//adjustment.signal_changed().connect (mem_fun (*this, &Scroomer::adjustment_changed));
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}
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Scroomer::~Scroomer()
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{
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}
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bool
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Scroomer::on_motion_notify_event (GdkEventMotion* ev)
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{
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double range = adj.get_upper() - adj.get_lower();
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double pixel2val = range / get_height();
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double val_at_pointer = ((get_height() - ev->y) * pixel2val) + adj.get_lower();
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double delta_y = ev->y - grab_y;
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double half_min_page = min_page_size / 2;
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double fract = delta_y / position[Total];
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double scale, temp, zoom;
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double val, page;
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if (grab_comp == None || grab_comp == Total) {
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return true;
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}
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if (ev->window != grab_window) {
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grab_y = ev->y;
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grab_window = ev->window;
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return true;
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}
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grab_y = ev->y;
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if (ev->state & GDK_CONTROL_MASK) {
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if (ev->state & GDK_MOD1_MASK) {
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scale = 0.05;
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} else {
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scale = 0.1;
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}
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} else {
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scale = 1.0;
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}
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fract = min (1.0, fract);
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fract = max (-1.0, fract);
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fract = -fract;
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switch(grab_comp) {
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case TopBase:
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case BottomBase:
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unzoomed_val += scale * fract * range;
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unzoomed_val = min(unzoomed_val, adj.get_upper() - unzoomed_page);
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unzoomed_val = max(unzoomed_val, adj.get_lower());
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break;
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case Slider:
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unzoomed_val += scale * fract * range;
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unzoomed_val = min(unzoomed_val, adj.get_upper() - unzoomed_page);
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unzoomed_val = max(unzoomed_val, adj.get_lower());
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break;
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case Handle1:
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unzoomed_page += scale * fract * range;
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unzoomed_page = min(unzoomed_page, adj.get_upper() - unzoomed_val);
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unzoomed_page = max(unzoomed_page, min_page_size);
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break;
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case Handle2:
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temp = unzoomed_val + unzoomed_page;
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unzoomed_val += scale * fract * range;
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unzoomed_val = min(unzoomed_val, temp - min_page_size);
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unzoomed_val = max(unzoomed_val, adj.get_lower());
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unzoomed_page = temp - unzoomed_val;
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unzoomed_page = max(unzoomed_page, min_page_size);
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break;
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default:
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break;
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}
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/*
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* Then we handle zoom, which is dragging horizontally. We zoom around the area that is
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* the current y pointer value, not from the area that was the start of the drag.
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* the point of zoom must have the same
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*/
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if (ev->x > get_width()) {
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zoom = ev->x - get_width();
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double higher = unzoomed_val + unzoomed_page - half_min_page - val_at_pointer;
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double lower = val_at_pointer - (unzoomed_val + half_min_page);
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higher *= zoom / 128;
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lower *= zoom / 128;
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val = unzoomed_val + lower;
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page = unzoomed_page - higher - lower;
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page = max(page, min_page_size);
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if (lower < 0) {
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val = max(val, val_at_pointer - half_min_page);
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} else if (lower > 0) {
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val = min(val, val_at_pointer - half_min_page);
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}
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val = min(val, adj.get_upper() - min_page_size);
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page = min(page, adj.get_upper() - val);
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} else if (ev->x < 0) {
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/* on zoom out increase the page size as well as moving the range towards the mouse pos*/
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zoom = abs(ev->x);
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/*double higher = unzoomed_val + unzoomed_page - half_min_page - val_at_pointer;
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double lower = val_at_pointer - (unzoomed_val + half_min_page);
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higher *= zoom / 128;
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lower *= zoom / 128;
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val = unzoomed_val + lower;
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page = unzoomed_page - higher - lower;
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page = max(page, min_page_size);
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if (lower < 0) {
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val = max(val, val_at_pointer - half_min_page);
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}
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else if (lower > 0) {
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val = min(val, val_at_pointer - half_min_page);
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}
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val = min(val, adj.get_upper() - min_page_size);
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page = min(page, adj.get_upper() - val);*/
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val = unzoomed_val;
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page = unzoomed_page;
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} else {
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val = unzoomed_val;
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page = unzoomed_page;
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}
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adj.set_page_size(page);
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if (val == adj.get_value()) {
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adj.value_changed();
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}
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if (val < adj.get_lower()) {
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adj.value_changed();
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} else if (val > adj.get_upper()) {
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adj.value_changed();
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} else {
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adj.set_value(val);
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}
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return true;
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}
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bool
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Scroomer::on_button_press_event (GdkEventButton* ev)
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{
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if (ev->button == 1) {
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Component comp = point_in(ev->y);
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if (comp == Total || comp == None) {
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return false;
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}
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add_modal_grab();
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grab_comp = comp;
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grab_y = ev->y;
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unzoomed_val = adj.get_value();
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unzoomed_page = adj.get_page_size();
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grab_window = ev->window;
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}
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return false;
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}
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bool
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Scroomer::on_button_release_event (GdkEventButton* ev)
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{
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if (grab_comp == None || grab_comp == Total) {
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return true;
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}
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if (ev->window != grab_window) {
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grab_y = ev->y;
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grab_window = ev->window;
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return true;
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}
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if (ev->button != 1) {
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return true;
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}
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switch(grab_comp) {
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case TopBase:
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break;
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case Handle1:
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break;
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case Slider:
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break;
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case Handle2:
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break;
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case BottomBase:
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break;
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default:
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break;
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}
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grab_comp = None;
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remove_modal_grab();
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return true;
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}
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bool
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Scroomer::on_scroll_event (GdkEventScroll*)
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{
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return true;
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}
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void
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Scroomer::on_size_allocate (Allocation& a)
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{
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Gtk::DrawingArea::on_size_allocate(a);
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position[Total] = a.get_height();
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set_min_page_size(min_page_size);
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update();
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}
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/*
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* assumes that x and width are correct, and they will not be altered
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*/
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void
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Scroomer::set_comp_rect(GdkRectangle& r, Component c) const
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{
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int index = (int) c;
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switch(c) {
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case None:
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return;
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case Total:
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r.y = 0;
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r.height = position[Total];
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break;
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default:
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r.y = position[index];
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r.height = position[index+1] - position[index];
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break;
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}
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}
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Scroomer::Component
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Scroomer::point_in(double point) const
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{
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for (int i = 0; i < Total; ++i) {
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if (position[i+1] >= point) {
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return (Component) i;
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}
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}
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return None;
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}
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void
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Scroomer::set_min_page_size(double ps)
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{
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double coeff = ((double)position[Total]) / (adj.get_upper() - adj.get_lower());
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min_page_size = ps;
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handle_size = (int) floor((ps * coeff) / 2);
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}
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void
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Scroomer::update()
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{
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double range = adj.get_upper() - adj.get_lower();
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//double value = adj.get_value() - adj.get_lower();
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int height = position[Total];
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double coeff = ((double) height) / range;
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/* save the old positions to calculate update regions later*/
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for (int i = Handle1; i < Total; ++i) {
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old_pos[i] = position[i];
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}
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position[BottomBase] = (int) floor(height - (adj.get_value() * coeff));
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position[Handle2] = position[BottomBase] - handle_size;
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position[Handle1] = (int) floor(height - ((adj.get_value() + adj.get_page_size()) * coeff));
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position[Slider] = position[Handle1] + handle_size;
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}
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void
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Scroomer::adjustment_changed()
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{
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//cerr << floor(adj.get_value()) << " " << floor(adj.get_value() + adj.get_page_size()) << endl;
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Gdk::Rectangle rect;
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Glib::RefPtr<Gdk::Window> win = get_window();
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update();
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if (!win) {
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return;
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}
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rect.set_x(0);
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rect.set_width(get_width());
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if (position[Handle1] < old_pos[Handle1]) {
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rect.set_y(position[Handle1]);
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rect.set_height(old_pos[Slider] - position[Handle1]);
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win->invalidate_rect(rect, false);
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} else if (position[Handle1] > old_pos[Handle1]) {
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rect.set_y(old_pos[Handle1]);
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rect.set_height(position[Slider] - old_pos[Handle1]);
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win->invalidate_rect(rect, false);
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}
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if (position[Handle2] < old_pos[Handle2]) {
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rect.set_y(position[Handle2]);
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rect.set_height(old_pos[BottomBase] - position[Handle2]);
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win->invalidate_rect(rect, false);
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} else if (position[Handle2] > old_pos[Handle2]) {
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rect.set_y(old_pos[Handle2]);
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rect.set_height(position[BottomBase] - old_pos[Handle2]);
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win->invalidate_rect(rect, false);
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}
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win->process_updates(false);
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}
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std::string
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Scroomer::get_comp_name(Component c)
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{
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switch(c) {
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case TopBase:
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return "TopBase";
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case Handle1:
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return "Handle1";
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case Slider:
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return "Slider";
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case Handle2:
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return "Handle2";
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case BottomBase:
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return "BottomBase";
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case Total:
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return "Total";
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case None:
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return "None";
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default:
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return "ERROR";
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}
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}
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