2 Copyright (C) 2008 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <gtkmm2ext/scroomer.h>
23 using namespace Gtkmm2ext;
28 Scroomer::Scroomer(Gtk::Adjustment& adjustment)
33 position[TopBase] = 0;
34 position[Handle1] = 0;
36 position[Handle2] = 0;
37 position[BottomBase] = 0;
40 add_events (Gdk::BUTTON_PRESS_MASK |
41 Gdk::BUTTON_RELEASE_MASK |
42 Gdk::POINTER_MOTION_MASK |
45 adjustment.signal_value_changed().connect (mem_fun (*this, &Scroomer::adjustment_changed));
46 //adjustment.signal_changed().connect (mem_fun (*this, &Scroomer::adjustment_changed));
54 Scroomer::on_motion_notify_event (GdkEventMotion* ev)
56 double range = adj.get_upper() - adj.get_lower();
57 double pixel2val = range / get_height();
58 double val_at_pointer = ((get_height() - ev->y) * pixel2val) + adj.get_lower();
59 double delta_y = ev->y - grab_y;
60 double half_min_page = min_page_size / 2;
61 double fract = delta_y / position[Total];
62 double scale, temp, zoom;
65 if (grab_comp == None || grab_comp == Total) {
69 if (ev->window != grab_window) {
71 grab_window = ev->window;
77 if (ev->state & GDK_CONTROL_MASK) {
78 if (ev->state & GDK_MOD1_MASK) {
87 fract = min (1.0, fract);
88 fract = max (-1.0, fract);
94 unzoomed_val += scale * fract * range;
95 unzoomed_val = min(unzoomed_val, adj.get_upper() - unzoomed_page);
96 unzoomed_val = max(unzoomed_val, adj.get_lower());
99 unzoomed_val += scale * fract * range;
100 unzoomed_val = min(unzoomed_val, adj.get_upper() - unzoomed_page);
101 unzoomed_val = max(unzoomed_val, adj.get_lower());
104 unzoomed_page += scale * fract * range;
105 unzoomed_page = min(unzoomed_page, adj.get_upper() - unzoomed_val);
106 unzoomed_page = max(unzoomed_page, min_page_size);
109 temp = unzoomed_val + unzoomed_page;
110 unzoomed_val += scale * fract * range;
111 unzoomed_val = min(unzoomed_val, temp - min_page_size);
112 unzoomed_val = max(unzoomed_val, adj.get_lower());
114 unzoomed_page = temp - unzoomed_val;
115 unzoomed_page = max(unzoomed_page, min_page_size);
121 /* Then we handle zoom, which is dragging horizontally. We zoom around the area that is
122 * the current y pointer value, not from the area that was the start of the drag.
123 * the point of zoom must have the same
126 if (ev->x > get_width()) {
127 zoom = ev->x - get_width();
129 double higher = unzoomed_val + unzoomed_page - half_min_page - val_at_pointer;
130 double lower = val_at_pointer - (unzoomed_val + half_min_page);
132 higher *= zoom / 128;
135 val = unzoomed_val + lower;
136 page = unzoomed_page - higher - lower;
138 page = max(page, min_page_size);
141 val = max(val, val_at_pointer - half_min_page);
142 } else if (lower > 0) {
143 val = min(val, val_at_pointer - half_min_page);
146 val = min(val, adj.get_upper() - min_page_size);
147 page = min(page, adj.get_upper() - val);
148 } else if (ev->x < 0) {
149 /* on zoom out increase the page size as well as moving the range towards the mouse pos*/
152 /*double higher = unzoomed_val + unzoomed_page - half_min_page - val_at_pointer;
153 double lower = val_at_pointer - (unzoomed_val + half_min_page);
155 higher *= zoom / 128;
158 val = unzoomed_val + lower;
159 page = unzoomed_page - higher - lower;
161 page = max(page, min_page_size);
164 val = max(val, val_at_pointer - half_min_page);
166 else if (lower > 0) {
167 val = min(val, val_at_pointer - half_min_page);
170 val = min(val, adj.get_upper() - min_page_size);
171 page = min(page, adj.get_upper() - val);*/
174 page = unzoomed_page;
177 page = unzoomed_page;
180 adj.set_page_size(page);
182 if (val == adj.get_value()) {
186 if (val < adj.get_lower()) {
188 } else if (val > adj.get_upper()) {
198 Scroomer::on_button_press_event (GdkEventButton* ev)
200 if (ev->button == 1) {
201 Component comp = point_in(ev->y);
203 if (comp == Total || comp == None) {
210 unzoomed_val = adj.get_value();
211 unzoomed_page = adj.get_page_size();
212 grab_window = ev->window;
218 Scroomer::on_button_release_event (GdkEventButton* ev)
220 if (grab_comp == None || grab_comp == Total) {
224 if (ev->window != grab_window) {
226 grab_window = ev->window;
230 if (ev->button != 1) {
256 Scroomer::on_scroll_event (GdkEventScroll*)
262 Scroomer::on_size_allocate (Allocation& a)
264 Gtk::DrawingArea::on_size_allocate(a);
266 position[Total] = a.get_height();
267 set_min_page_size(min_page_size);
271 /** Assumes that x and width are correct, and they will not be altered.
274 Scroomer::set_comp_rect(GdkRectangle& r, Component c) const
283 r.height = position[Total];
286 r.y = position[index];
287 r.height = position[index+1] - position[index];
293 Scroomer::point_in(double point) const
295 for (int i = 0; i < Total; ++i) {
296 if (position[i+1] >= point) {
297 return (Component) i;
305 Scroomer::set_min_page_size(double ps)
307 double coeff = ((double)position[Total]) / (adj.get_upper() - adj.get_lower());
310 handle_size = (int) floor((ps * coeff) / 2);
316 double range = adj.get_upper() - adj.get_lower();
317 //double value = adj.get_value() - adj.get_lower();
318 int height = position[Total];
319 double coeff = ((double) height) / range;
321 /* save the old positions to calculate update regions later*/
322 for (int i = Handle1; i < Total; ++i) {
323 old_pos[i] = position[i];
326 position[BottomBase] = (int) floor(height - (adj.get_value() * coeff));
327 position[Handle2] = position[BottomBase] - handle_size;
329 position[Handle1] = (int) floor(height - ((adj.get_value() + adj.get_page_size()) * coeff));
330 position[Slider] = position[Handle1] + handle_size;
334 Scroomer::adjustment_changed()
336 //cerr << floor(adj.get_value()) << " " << floor(adj.get_value() + adj.get_page_size()) << endl;
338 Glib::RefPtr<Gdk::Window> win = get_window();
347 rect.set_width(get_width());
349 if (position[Handle1] < old_pos[Handle1]) {
350 rect.set_y(position[Handle1]);
351 rect.set_height(old_pos[Slider] - position[Handle1]);
352 win->invalidate_rect(rect, false);
353 } else if (position[Handle1] > old_pos[Handle1]) {
354 rect.set_y(old_pos[Handle1]);
355 rect.set_height(position[Slider] - old_pos[Handle1]);
356 win->invalidate_rect(rect, false);
359 if (position[Handle2] < old_pos[Handle2]) {
360 rect.set_y(position[Handle2]);
361 rect.set_height(old_pos[BottomBase] - position[Handle2]);
362 win->invalidate_rect(rect, false);
363 } else if (position[Handle2] > old_pos[Handle2]) {
364 rect.set_y(old_pos[Handle2]);
365 rect.set_height(position[BottomBase] - old_pos[Handle2]);
366 win->invalidate_rect(rect, false);
369 win->process_updates(false);
373 Scroomer::get_comp_name(Component c)