275 lines
6.8 KiB
C++
275 lines
6.8 KiB
C++
/*
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Copyright (C) 2005 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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$Id$
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*/
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#include <iostream>
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#include <algorithm>
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#include <cmath>
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#include <gtkmm.h>
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#include "gtkmm2ext/pixscroller.h"
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#include "gtkmm2ext/keyboard.h"
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using namespace std;
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using namespace Gtk;
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using namespace Gtkmm2ext;
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PixScroller::PixScroller (Adjustment& a,
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Glib::RefPtr<Gdk::Pixbuf> s,
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Glib::RefPtr<Gdk::Pixbuf> r)
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: adj (a),
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rail (r),
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slider (s)
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{
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Cairo::Format format;
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dragging = false;
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add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK);
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adj.signal_value_changed().connect (mem_fun (*this, &PixScroller::adjustment_changed));
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default_value = adj.get_value();
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sliderrect.set_width(slider->get_width());
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sliderrect.set_height(slider->get_height());
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railrect.set_width(rail->get_width());
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railrect.set_height(rail->get_height());
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railrect.set_y(sliderrect.get_height() / 2);
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sliderrect.set_x(0);
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overall_height = railrect.get_height() + sliderrect.get_height();
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sliderrect.set_y((int) rint ((overall_height - sliderrect.get_height()) * (adj.get_upper() - adj.get_value())));
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railrect.set_x((sliderrect.get_width() / 2) - 2);
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if (rail->get_has_alpha()) {
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format = Cairo::FORMAT_ARGB32;
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} else {
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format = Cairo::FORMAT_RGB24;
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}
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rail_surface = Cairo::ImageSurface::create (format, rail->get_width(), rail->get_height());
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rail_context = Cairo::Context::create (rail_surface);
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Gdk::Cairo::set_source_pixbuf (rail_context, rail, 0.0, 0.0);
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rail_context->paint();
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if (slider->get_has_alpha()) {
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format = Cairo::FORMAT_ARGB32;
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} else {
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format = Cairo::FORMAT_RGB24;
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}
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slider_surface = Cairo::ImageSurface::create (format, slider->get_width(), slider->get_height());
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slider_context = Cairo::Context::create (slider_surface);
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Gdk::Cairo::set_source_pixbuf (slider_context, slider, 0.0, 0.0);
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slider_context->paint();
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}
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void
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PixScroller::on_size_request (GtkRequisition* requisition)
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{
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requisition->width = sliderrect.get_width();
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requisition->height = overall_height;
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}
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bool
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PixScroller::on_expose_event (GdkEventExpose* ev)
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{
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GdkRectangle intersect;
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Glib::RefPtr<Gdk::Window> win (get_window());
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Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
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if (gdk_rectangle_intersect (railrect.gobj(), &ev->area, &intersect)) {
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context->save();
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context->rectangle (intersect.x, intersect.y, intersect.width, intersect.height);
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context->clip();
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context->set_source (rail_surface, intersect.x - railrect.get_x(), intersect.y - railrect.get_y());
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context->rectangle (intersect.x, intersect.y, intersect.width, intersect.height);
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context->clip();
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context->paint();
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context->restore();
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}
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if (gdk_rectangle_intersect (sliderrect.gobj(), &ev->area, &intersect)) {
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context->save();
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context->rectangle (intersect.x, intersect.y, intersect.width, intersect.height);
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context->clip();
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context->set_source (rail_surface, intersect.x - sliderrect.get_x(), intersect.y - sliderrect.get_y());
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context->rectangle (intersect.x, intersect.y, intersect.width, intersect.height);
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context->clip();
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context->paint();
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context->restore();
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}
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return true;
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}
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bool
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PixScroller::on_button_press_event (GdkEventButton* ev)
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{
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switch (ev->button) {
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case 1:
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if (!(ev->state & Keyboard::TertiaryModifier)) {
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add_modal_grab();
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grab_y = ev->y;
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grab_start = ev->y;
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grab_window = ev->window;
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dragging = true;
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}
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break;
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default:
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break;
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}
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return false;
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}
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bool
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PixScroller::on_button_release_event (GdkEventButton* ev)
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{
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double scale;
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if (ev->state & Keyboard::PrimaryModifier) {
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if (ev->state & Keyboard::SecondaryModifier) {
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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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switch (ev->button) {
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case 1:
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if (dragging) {
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remove_modal_grab();
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dragging = false;
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if (ev->y == grab_start) {
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/* no motion - just a click */
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double fract;
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if (ev->y < sliderrect.get_height()/2) {
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/* near the top */
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fract = 1.0;
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} else {
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fract = 1.0 - (ev->y - sliderrect.get_height()/2) / railrect.get_height();
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}
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fract = min (1.0, fract);
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fract = max (0.0, fract);
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adj.set_value (scale * fract * (adj.get_upper() - adj.get_lower()));
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}
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} else {
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if (ev->state & Keyboard::TertiaryModifier) {
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adj.set_value (default_value);
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cerr << "default value = " << default_value << endl;
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}
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}
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break;
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default:
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break;
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}
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return false;
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}
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bool
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PixScroller::on_scroll_event (GdkEventScroll* ev)
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{
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double scale;
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if (ev->state & Keyboard::PrimaryModifier) {
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if (ev->state & Keyboard::SecondaryModifier) {
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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 = 0.5;
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}
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switch (ev->direction) {
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case GDK_SCROLL_UP:
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/* wheel up */
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adj.set_value (adj.get_value() + (adj.get_page_increment() * scale));
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break;
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case GDK_SCROLL_DOWN:
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/* wheel down */
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adj.set_value (adj.get_value() - (adj.get_page_increment() * scale));
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break;
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default:
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break;
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}
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return false;
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}
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bool
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PixScroller::on_motion_notify_event (GdkEventMotion* ev)
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{
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if (dragging) {
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double fract;
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double delta;
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double scale;
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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->state & Keyboard::PrimaryModifier) {
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if (ev->state & Keyboard::SecondaryModifier) {
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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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delta = ev->y - grab_y;
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grab_y = ev->y;
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fract = (delta / railrect.get_height());
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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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adj.set_value (adj.get_value() + scale * fract * (adj.get_upper() - adj.get_lower()));
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}
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return true;
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}
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void
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PixScroller::adjustment_changed ()
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{
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int y = (int) rint ((overall_height - sliderrect.get_height()) * (adj.get_upper() - adj.get_value()));
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if (y != sliderrect.get_y()) {
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sliderrect.set_y(y);
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queue_draw ();
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}
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}
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