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toggle_widget.cpp
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toggle_widget.cpp
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// this file has the drawing code for our custom widget
#include "toggle_widget.h"
toggle::toggle()
{
val = 0;
pos_mode=0;
label = "TOGGLE";
top_colour.set( "#550000");
bottom_colour.set( "#220000");
// make the click events call the on_button_press_event function
set_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK);
// make the click event do that function
// signal_button_press_event().connect( sigc::mem_fun(*this, &toggle::on_button_press_event) );
set_size_request(40,70);
}
toggle::~toggle()
{
}
void toggle::position_top(bool mode)
{
if (mode)
{
grad_top_colour = 0.3;
grad_bottom_colour = 0.1*2;
}
else
{
grad_top_colour = 0.1*2;
grad_bottom_colour = 0.1;
}
}
void toggle::set_label(string text)
{
label = text;
queue_draw();
}
void toggle::set_value(int _value)
{
val = _value;
queue_draw();
}
bool toggle::on_button_press_event(GdkEventButton* event)
{
return true;
}
bool toggle::on_button_release_event(GdkEventButton* event)
{
val = 1 - val;
float new_value = (float)val;
// here we use the LV2UI_Controller and LV2UI_write_function "things"
// to write some data to a port
write_function( controller, port_number, sizeof(float), 0, (const void*)&new_value);
queue_draw();
return true;
}
bool toggle::on_expose_event(GdkEventExpose* event)
{
// This is where we draw on the window
Glib::RefPtr<Gdk::Window> window = get_window();
if(window)
{
Gtk::Allocation allocation = get_allocation();
const int width = allocation.get_width();
const int height = allocation.get_height() - (allocation.get_height()/3);
const int height_offset = allocation.get_height()/6;
// coordinates for the center of the window
int xc, yc;
xc = width / 2;
yc = height / 2;
Cairo::RefPtr<Cairo::Context> cr = window->create_cairo_context();
cr->set_line_width(6.0);
// clip to the area indicated by the expose event so that we only redraw
// the portion of the window that needs to be redrawn
cr->rectangle(event->area.x, event->area.y,
event->area.width, event->area.height);
cr->clip();
// background grad
Cairo::RefPtr<Cairo::LinearGradient> back_grad =
Cairo::LinearGradient::create( 0,0,0,allocation.get_height() );
switch (pos_mode)
{
case 0:
back_grad->add_color_stop_rgba(0,top_colour.get_red_p(),top_colour.get_green_p(),top_colour.get_blue_p(),1);
back_grad->add_color_stop_rgba(1,bottom_colour.get_red_p(),bottom_colour.get_green_p(),bottom_colour.get_blue_p(),1);
break;
case 1:
back_grad->add_color_stop_rgba(0,top_colour.get_red_p(),top_colour.get_green_p(),top_colour.get_blue_p(),1);
back_grad->add_color_stop_rgba(1,
(bottom_colour.get_red_p() + top_colour.get_red_p())/2,
(bottom_colour.get_green_p() + top_colour.get_green_p())/2,
(bottom_colour.get_blue_p() + top_colour.get_blue_p())/2,
1);
break;
case 2:
back_grad->add_color_stop_rgba(0,
(bottom_colour.get_red_p() + top_colour.get_red_p())/2,
(bottom_colour.get_green_p() + top_colour.get_green_p())/2,
(bottom_colour.get_blue_p() + top_colour.get_blue_p())/2,
1);
back_grad->add_color_stop_rgba(1,bottom_colour.get_red_p(),bottom_colour.get_green_p(),bottom_colour.get_blue_p(),1);
break;
}
// fill background
cr->rectangle(event->area.x, event->area.y,
event->area.width, event->area.height);
cr->set_source(back_grad);
cr->fill();
// ------------------------------------------------------------------
// draw text label
cr->select_font_face("Bitstream Vera Sans", Cairo::FONT_SLANT_NORMAL,
Cairo::FONT_WEIGHT_NORMAL);
cr->set_font_size(width/4.5);
cr->set_source_rgba(0.9,0.9,0.9,0.8);
Cairo::FontOptions font_options;
font_options.set_hint_style(Cairo::HINT_STYLE_NONE);
font_options.set_hint_metrics(Cairo::HINT_METRICS_OFF);
font_options.set_antialias(Cairo::ANTIALIAS_GRAY);
int x_font_centre = (width/2) - ((width/5) * (label.length()/3.5));
cairo_text_extents_t txt_extents;
stringstream txt;
cr->set_font_size(width/5);
txt.str("");
txt << label;
cr->get_text_extents(txt.str(),txt_extents);
cr->move_to( width/2 - (txt_extents.width/2),height/3.5);
cr->show_text(txt.str());
cr->set_line_width(width/14);
cr->set_source_rgba(0.8,0.8,0.8,1.0);
Cairo::RefPtr<Cairo::LinearGradient> grad2 =
Cairo::LinearGradient::create(width/4, 0,width-(width/4), 0 );
grad2->add_color_stop_rgba(0.0,0.2,0.2,0.2,1);
grad2->add_color_stop_rgba(0.4,0.8,0.8,0.8,1);
grad2->add_color_stop_rgba(1.0,0.4,0.4,0.4,1);
cr->set_source(grad2);
Cairo::RefPtr<Cairo::LinearGradient> toggle_grad1;
Cairo::RefPtr<Cairo::RadialGradient> grad_led;
stringstream slider_value;
switch (val)
{
case 0:
slider_value.str("OFF");
cr->arc((allocation.get_width()/1.9), (allocation.get_height()/1.9), (allocation.get_width()/2.8), 0.0, 2 * M_PI);
cr->set_source_rgba(0,0,0,0.5);
cr->fill();
toggle_grad1 = Cairo::LinearGradient::create( (allocation.get_width()/1.9), (allocation.get_height()/1.9),allocation.get_width()/3,allocation.get_height()/3 );
toggle_grad1->add_color_stop_rgba(0,0.2,0.2,0.2,1);
toggle_grad1->add_color_stop_rgba(0.5,0.4,0.4,0.4,1);
toggle_grad1->add_color_stop_rgba(1,0.0,0.0,0.0,1);
cr->arc((allocation.get_width()/1.9), (allocation.get_height()/1.9), (allocation.get_width()/3), 0.0, 2 * M_PI);
cr->set_source(toggle_grad1);
cr->fill();
cr->arc((allocation.get_width()/1.9), (allocation.get_height()/1.9), (allocation.get_width()/5), 0.0, 2 * M_PI);
cr->set_source_rgba(0,0,0,0.5);
cr->fill();
grad_led = Cairo::RadialGradient::create( (allocation.get_width()/2),
(allocation.get_height()/2), 0, (allocation.get_width()/2),
(allocation.get_height()/2) ,(allocation.get_width()/2.5));
grad_led->add_color_stop_rgba(0,0.0,0.2,0.0,1);
grad_led->add_color_stop_rgba(0.3,0.0,0.01,0.0,1);
grad_led->add_color_stop_rgba(0.8,0.0,0.01,0.0,1);
grad_led->add_color_stop_rgba(1.0,0.0,0.0,0.0,1);
cr->arc((allocation.get_width()/1.9), (allocation.get_height()/1.9), (allocation.get_width()/6), 0.0, 2 * M_PI);
cr->set_source(grad_led);
cr->fill();
break;
case 1:
slider_value.str("ON");
cr->arc((allocation.get_width()/1.9), (allocation.get_height()/1.9), (allocation.get_width()/2.8), 0.0, 2 * M_PI);
cr->set_source_rgba(0,0,0,0.5);
cr->fill();
toggle_grad1 = Cairo::LinearGradient::create( (allocation.get_width()/1.9), (allocation.get_height()/1.9),allocation.get_width()/3,allocation.get_height()/3 );
toggle_grad1->add_color_stop_rgba(0,0.2,0.2,0.2,1);
toggle_grad1->add_color_stop_rgba(0.3,0.4,0.4,0.4,1);
toggle_grad1->add_color_stop_rgba(1,0.0,0.0,0.0,1);
cr->arc((allocation.get_width()/1.9), (allocation.get_height()/1.9), (allocation.get_width()/3), 0.0, 2 * M_PI);
cr->set_source(toggle_grad1);
cr->fill();
cr->arc((allocation.get_width()/1.9), (allocation.get_height()/1.9), (allocation.get_width()/5), 0.0, 2 * M_PI);
cr->set_source_rgba(0,0,0,0.5);
cr->fill();
grad_led = Cairo::RadialGradient::create( (allocation.get_width()/1.9),
(allocation.get_height()/1.9), 0, (allocation.get_width()/2),
(allocation.get_height()/2) ,(allocation.get_width()/2.5));
grad_led->add_color_stop_rgba(0,0.0,0.9,0.0,1);
grad_led->add_color_stop_rgba(0.3,0.0,0.1,0.0,1);
grad_led->add_color_stop_rgba(0.9,0.0,0.10,0.0,1);
grad_led->add_color_stop_rgba(1.0,0.0,0.0,0.0,1);
cr->arc((allocation.get_width()/1.9), (allocation.get_height()/1.9), (allocation.get_width()/6), 0.0, 2 * M_PI);
cr->set_source(grad_led);
cr->fill();
break;
}
cr->set_source_rgba(0.9,0.9,0.9,0.8);
cr->set_font_size(width/5);
txt.str("");
txt << slider_value.str();
cr->get_text_extents(txt.str(),txt_extents);
cr->move_to( width/2 - (txt_extents.width/2),
allocation.get_height() - (height_offset/1.5));
cr->show_text(txt.str());
}
return true;
}