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.
22 #include "gtkmm2ext/scroomer.h"
23 #include "gtkmm2ext/keyboard.h"
25 using namespace Gtkmm2ext;
30 Scroomer::Scroomer(Gtk::Adjustment& adjustment)
35 position[TopBase] = 0;
36 position[Handle1] = 0;
38 position[Handle2] = 0;
39 position[BottomBase] = 0;
42 add_events (Gdk::BUTTON_PRESS_MASK |
43 Gdk::BUTTON_RELEASE_MASK |
44 Gdk::POINTER_MOTION_MASK |
47 adjustment.signal_value_changed().connect (mem_fun (*this, &Scroomer::adjustment_changed));
48 //adjustment.signal_changed().connect (mem_fun (*this, &Scroomer::adjustment_changed));
56 Scroomer::on_motion_notify_event (GdkEventMotion* ev)
58 double range = adj.get_upper() - adj.get_lower();
59 double pixel2val = range / get_height();
60 double val_at_pointer = ((get_height() - ev->y) * pixel2val) + adj.get_lower();
61 double delta_y = ev->y - grab_y;
62 double half_min_page = min_page_size / 2;
63 double fract = delta_y / position[Total];
64 double scale, temp, zoom;
67 if (grab_comp == None || grab_comp == Total) {
71 if (ev->window != grab_window) {
73 grab_window = ev->window;
79 if (ev->state & Keyboard::PrimaryModifier) {
80 if (ev->state & Keyboard::SecondaryModifier) {
89 fract = min (1.0, fract);
90 fract = max (-1.0, fract);
96 unzoomed_val += scale * fract * range;
97 unzoomed_val = min(unzoomed_val, adj.get_upper() - unzoomed_page);
98 unzoomed_val = max(unzoomed_val, adj.get_lower());
101 unzoomed_val += scale * fract * range;
102 unzoomed_val = min(unzoomed_val, adj.get_upper() - unzoomed_page);
103 unzoomed_val = max(unzoomed_val, adj.get_lower());
107 unzoomed_page += scale * fract * range;
108 unzoomed_page = min(unzoomed_page, adj.get_upper() - unzoomed_val);
109 unzoomed_page = max(unzoomed_page, min_page_size);
112 temp = unzoomed_val + unzoomed_page;
113 unzoomed_val -= scale * fract * range * 0.5;
114 unzoomed_val = min(unzoomed_val, temp - min_page_size);
115 unzoomed_val = max(unzoomed_val, adj.get_lower());
120 temp = unzoomed_val + unzoomed_page;
121 unzoomed_val += scale * fract * range;
122 unzoomed_val = min(unzoomed_val, temp - min_page_size);
123 unzoomed_val = max(unzoomed_val, adj.get_lower());
125 unzoomed_page = temp - unzoomed_val;
129 unzoomed_page -= scale * fract * range;
132 unzoomed_page = min(unzoomed_page, adj.get_upper() - unzoomed_val);
133 unzoomed_page = max(unzoomed_page, min_page_size);
139 /* Then we handle zoom, which is dragging horizontally. We zoom around the area that is
140 * the current y pointer value, not from the area that was the start of the drag.
141 * the point of zoom must have the same
144 if (ev->x > get_width()) {
145 zoom = ev->x - get_width();
147 double higher = unzoomed_val + unzoomed_page - half_min_page - val_at_pointer;
148 double lower = val_at_pointer - (unzoomed_val + half_min_page);
150 higher *= zoom / 128;
153 val = unzoomed_val + lower;
154 page = unzoomed_page - higher - lower;
156 page = max(page, min_page_size);
159 val = max(val, val_at_pointer - half_min_page);
160 } else if (lower > 0) {
161 val = min(val, val_at_pointer - half_min_page);
164 val = min(val, adj.get_upper() - min_page_size);
165 page = min(page, adj.get_upper() - val);
166 } else if (ev->x < 0) {
167 /* on zoom out increase the page size as well as moving the range towards the mouse pos*/
170 /*double higher = unzoomed_val + unzoomed_page - half_min_page - val_at_pointer;
171 double lower = val_at_pointer - (unzoomed_val + half_min_page);
173 higher *= zoom / 128;
176 val = unzoomed_val + lower;
177 page = unzoomed_page - higher - lower;
179 page = max(page, min_page_size);
182 val = max(val, val_at_pointer - half_min_page);
184 else if (lower > 0) {
185 val = min(val, val_at_pointer - half_min_page);
188 val = min(val, adj.get_upper() - min_page_size);
189 page = min(page, adj.get_upper() - val);*/
192 page = unzoomed_page;
195 page = unzoomed_page;
198 adj.set_page_size(page);
206 Scroomer::on_scroll_event (GdkEventScroll* ev)
208 switch (ev->direction) {
210 adj.set_value (adj.get_value() - adj.get_page_size()/10.0);
212 case GDK_SCROLL_DOWN:
213 adj.set_value (adj.get_value() + adj.get_page_size()/10.0);
223 Scroomer::on_button_press_event (GdkEventButton* ev)
225 if (ev->button == 1 || ev->button == 3) {
226 Component comp = point_in(ev->y);
228 if (comp == Total || comp == None) {
235 unzoomed_val = adj.get_value();
236 unzoomed_page = adj.get_page_size();
237 grab_window = ev->window;
239 if (ev->button == 3){
245 DragStarting (); /* EMIT SIGNAL */
252 Scroomer::on_button_release_event (GdkEventButton* ev)
254 if (grab_comp == None || grab_comp == Total) {
258 if (ev->window != grab_window) {
260 grab_window = ev->window;
264 if (ev->button != 1 && ev->button != 3) {
286 DragFinishing (); /* EMIT SIGNAL */
291 Scroomer::on_size_allocate (Allocation& a)
293 Gtk::DrawingArea::on_size_allocate(a);
295 position[Total] = a.get_height();
296 set_min_page_size(min_page_size);
300 /** Assumes that x and width are correct, and they will not be altered.
303 Scroomer::set_comp_rect(GdkRectangle& r, Component c) const
312 r.height = position[Total];
315 r.y = position[index];
316 r.height = position[index+1] - position[index];
322 Scroomer::point_in(double point) const
324 for (int i = 0; i < Total; ++i) {
325 if (position[i+1] >= point) {
326 return (Component) i;
334 Scroomer::set_min_page_size(double ps)
336 double coeff = ((double)position[Total]) / (adj.get_upper() - adj.get_lower());
339 handle_size = (int) floor((ps * coeff) / 2);
345 double range = adj.get_upper() - adj.get_lower();
346 //double value = adj.get_value() - adj.get_lower();
347 int height = position[Total];
348 double coeff = ((double) height) / range;
350 /* save the old positions to calculate update regions later*/
351 for (int i = Handle1; i < Total; ++i) {
352 old_pos[i] = position[i];
355 position[BottomBase] = (int) floor(height - (adj.get_value() * coeff));
356 position[Handle2] = position[BottomBase] - handle_size;
358 position[Handle1] = (int) floor(height - ((adj.get_value() + adj.get_page_size()) * coeff));
359 position[Slider] = position[Handle1] + handle_size;
363 Scroomer::adjustment_changed()
365 //cerr << floor(adj.get_value()) << " " << floor(adj.get_value() + adj.get_page_size()) << endl;
367 Glib::RefPtr<Gdk::Window> win = get_window();
376 rect.set_width(get_width());
378 if (position[Handle1] < old_pos[Handle1]) {
379 rect.set_y(position[Handle1]);
380 rect.set_height(old_pos[Slider] - position[Handle1]);
381 win->invalidate_rect(rect, false);
382 } else if (position[Handle1] > old_pos[Handle1]) {
383 rect.set_y(old_pos[Handle1]);
384 rect.set_height(position[Slider] - old_pos[Handle1]);
385 win->invalidate_rect(rect, false);
388 if (position[Handle2] < old_pos[Handle2]) {
389 rect.set_y(position[Handle2]);
390 rect.set_height(old_pos[BottomBase] - position[Handle2]);
391 win->invalidate_rect(rect, false);
392 } else if (position[Handle2] > old_pos[Handle2]) {
393 rect.set_y(old_pos[Handle2]);
394 rect.set_height(position[BottomBase] - old_pos[Handle2]);
395 win->invalidate_rect(rect, false);