hvirtual/cinelerra/canvas.C

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#include "bcsignals.h"
#include "canvas.h"
#include "clip.h"
#include "edl.h"
#include "edlsession.h"
#include "keys.h"
#include "language.h"
#include "mainsession.h"
#include "mutex.h"
#include "mwindow.h"
#include "vframe.h"



Canvas::Canvas(MWindow *mwindow,
        BC_WindowBase *subwindow, 
        int x, 
        int y, 
        int w, 
        int h,
        int output_w,
        int output_h,
        int use_scrollbars,
        int use_cwindow,
        int use_rwindow,
        int use_vwindow)
{
        reset();

        if(x < 10) x = 10;
        if(y < 10) y = 10;
        this->mwindow = mwindow;
        this->subwindow = subwindow;
        this->x = x;
        this->y = y;
        this->w = w;
        this->h = h;
        this->output_w = output_w;
        this->output_h = output_h;
        this->use_scrollbars = use_scrollbars;
        this->use_cwindow = use_cwindow;
        this->use_rwindow = use_rwindow;
        this->use_vwindow = use_vwindow;
        this->root_w = subwindow->get_root_w(0, 0);
        this->root_h = subwindow->get_root_h(0);
        canvas_lock = new Mutex("Canvas::canvas_lock", 1);
}

Canvas::~Canvas()
{
        if(refresh_frame) delete refresh_frame;
        delete canvas_menu;
        if(yscroll) delete yscroll;
        if(xscroll) delete xscroll;
        delete canvas_subwindow;
        delete canvas_fullscreen;
        delete canvas_lock;
}

void Canvas::reset()
{
        use_scrollbars = 0;
        output_w = 0;
        output_h = 0;
    xscroll = 0;
    yscroll = 0;
        refresh_frame = 0;
        canvas_subwindow = 0;
        canvas_fullscreen = 0;
        is_processing = 0;
        cursor_inside = 0;
}

void Canvas::lock_canvas(char *location)
{
        canvas_lock->lock(location);
}

void Canvas::unlock_canvas()
{
        canvas_lock->unlock();
}

int Canvas::is_locked()
{
        return canvas_lock->is_locked();
}


BC_WindowBase* Canvas::get_canvas()
{
        if(get_fullscreen() && canvas_fullscreen) 
                return canvas_fullscreen;
        else
                return canvas_subwindow;
}


// Get dimensions given a zoom
void Canvas::calculate_sizes(float aspect_ratio, 
        int output_w, 
        int output_h, 
        float zoom, 
        int &w, 
        int &h)
{
// Horizontal stretch
        if((float)output_w / output_h <= aspect_ratio)
        {
                w = (int)((float)output_h * aspect_ratio * zoom);
                h = (int)((float)output_h * zoom);
        }
        else
// Vertical stretch
        {
                h = (int)((float)output_w / aspect_ratio * zoom);
                w = (int)((float)output_w * zoom);
        }
}

float Canvas::get_x_offset(EDL *edl, 
        int single_channel, 
        float zoom_x, 
        float conformed_w,
        float conformed_h)
{
        if(use_scrollbars)
        {
                if(xscroll) 
                {
// If the projection is smaller than the canvas, this forces it in the center.
//                      if(conformed_w < w_visible)
//                              return -(float)(w_visible - conformed_w) / 2;

                        return (float)get_xscroll();
                }
                else
                        return ((float)-get_canvas()->get_w() / zoom_x + 
                                edl->session->output_w) / 2;
        }
        else
        {
                int out_w, out_h;
                int canvas_w = get_canvas()->get_w();
                int canvas_h = get_canvas()->get_h();
                out_w = canvas_w;
                out_h = canvas_h;
                
                if((float)out_w / out_h > conformed_w / conformed_h)
                {
                        out_w = (int)(out_h * conformed_w / conformed_h + 0.5);
                }
                
                if(out_w < canvas_w)
                        return -(canvas_w - out_w) / 2 / zoom_x;
        }

        return 0;
}

float Canvas::get_y_offset(EDL *edl, 
        int single_channel, 
        float zoom_y, 
        float conformed_w,
        float conformed_h)
{
        if(use_scrollbars)
        {
                if(yscroll)
                {
// If the projection is smaller than the canvas, this forces it in the center.
//                      if(conformed_h < h_visible)
//                              return -(float)(h_visible - conformed_h) / 2;

                        return (float)get_yscroll();
                }
                else
                        return ((float)-get_canvas()->get_h() / zoom_y + 
                                edl->session->output_h) / 2;
        }
        else
        {
                int out_w, out_h;
                int canvas_w = get_canvas()->get_w();
                int canvas_h = get_canvas()->get_h();
                out_w = canvas_w;
                out_h = canvas_h;

                if((float)out_w / out_h <= conformed_w / conformed_h)
                {
                        out_h = (int)((float)out_w / (conformed_w / conformed_h) + 0.5);
                }

//printf("Canvas::get_y_offset 1 %d %d %f\n", out_h, canvas_h, -((float)canvas_h - out_h) / 2);
                if(out_h < canvas_h)
                        return -((float)canvas_h - out_h) / 2 / zoom_y;
        }

        return 0;
}

// This may not be used anymore
void Canvas::check_boundaries(EDL *edl, int &x, int &y, float &zoom)
{
        if(x + w_visible > w_needed) x = w_needed - w_visible;
        if(y + h_visible > h_needed) y = h_needed - h_visible;

        if(x < 0) x = 0;
        if(y < 0) y = 0;
}

void Canvas::update_scrollbars()
{
        if(use_scrollbars)
        {
                if(xscroll) xscroll->update_length(w_needed, get_xscroll(), w_visible);
                if(yscroll) yscroll->update_length(h_needed, get_yscroll(), h_visible);
        }
}

void Canvas::get_zooms(EDL *edl, 
        int single_channel, 
        float &zoom_x, 
        float &zoom_y,
        float &conformed_w,
        float &conformed_h)
{
        edl->calculate_conformed_dimensions(single_channel, 
                conformed_w, 
                conformed_h);

        if(use_scrollbars)
        {
                zoom_x = get_zoom() * 
                        conformed_w / 
                        edl->session->output_w;
                zoom_y = get_zoom() * 
                        conformed_h / 
                        edl->session->output_h;
        }
        else
        {
                int out_w, out_h;
                int canvas_w = get_canvas()->get_w();
                int canvas_h = get_canvas()->get_h();
        
                out_w = canvas_w;
                out_h = canvas_h;

                if((float)out_w / out_h > conformed_w / conformed_h)
                {
                        out_w = (int)((float)out_h * conformed_w / conformed_h + 0.5);
                }
                else
                {
                        out_h = (int)((float)out_w / (conformed_w / conformed_h) + 0.5);
                }

                zoom_x = (float)out_w / edl->session->output_w;
                zoom_y = (float)out_h / edl->session->output_h;
//printf("get zooms 2 %d %d %f %f\n", canvas_w, canvas_h, conformed_w, conformed_h);
        }
}

// Convert a coordinate on the canvas to a coordinate on the output
void Canvas::canvas_to_output(EDL *edl, int single_channel, float &x, float &y)
{
        float zoom_x, zoom_y, conformed_w, conformed_h;
        get_zooms(edl, single_channel, zoom_x, zoom_y, conformed_w, conformed_h);

//printf("Canvas::canvas_to_output y=%f zoom_y=%f y_offset=%f\n", 
//      y, zoom_y, get_y_offset(edl, single_channel, zoom_y, conformed_w, conformed_h));

        x = (float)x / zoom_x + get_x_offset(edl, single_channel, zoom_x, conformed_w, conformed_h);
        y = (float)y / zoom_y + get_y_offset(edl, single_channel, zoom_y, conformed_w, conformed_h);
}

void Canvas::output_to_canvas(EDL *edl, int single_channel, float &x, float &y)
{
        float zoom_x, zoom_y, conformed_w, conformed_h;
        get_zooms(edl, single_channel, zoom_x, zoom_y, conformed_w, conformed_h);

//printf("Canvas::output_to_canvas x=%f zoom_x=%f x_offset=%f\n", x, zoom_x, get_x_offset(edl, single_channel, zoom_x, conformed_w));

        x = (float)zoom_x * (x - get_x_offset(edl, single_channel, zoom_x, conformed_w, conformed_h));
        y = (float)zoom_y * (y - get_y_offset(edl, single_channel, zoom_y, conformed_w, conformed_h));
}



void Canvas::get_transfers(EDL *edl, 
        float &output_x1, 
        float &output_y1, 
        float &output_x2, 
        float &output_y2,
        float &canvas_x1, 
        float &canvas_y1, 
        float &canvas_x2, 
        float &canvas_y2,
        int canvas_w,
        int canvas_h)
{
// printf("Canvas::get_transfers %d %d\n", canvas_w, 
//              canvas_h);
// automatic canvas size detection
        if(canvas_w < 0) canvas_w = get_canvas()->get_w();
        if(canvas_h < 0) canvas_h = get_canvas()->get_h();

// Canvas is zoomed to a portion of the output frame
        if(use_scrollbars)
        {
                float in_x1, in_y1, in_x2, in_y2;
                float out_x1, out_y1, out_x2, out_y2;
                float zoom_x, zoom_y, conformed_w, conformed_h;

                get_zooms(edl, 0, zoom_x, zoom_y, conformed_w, conformed_h);
                out_x1 = 0;
                out_y1 = 0;
                out_x2 = canvas_w;
                out_y2 = canvas_h;
                in_x1 = 0;
                in_y1 = 0;
                in_x2 = canvas_w;
                in_y2 = canvas_h;

                canvas_to_output(edl, 0, in_x1, in_y1);
                canvas_to_output(edl, 0, in_x2, in_y2);

//printf("Canvas::get_transfers 1 %.0f %.0f %.0f %.0f -> %.0f %.0f %.0f %.0f\n",
//in_x1, in_y1, in_x2, in_y2, out_x1, out_y1, out_x2, out_y2);

                if(in_x1 < 0)
                {
                        out_x1 += -in_x1 * zoom_x;
                        in_x1 = 0;
                }

                if(in_y1 < 0)
                {
                        out_y1 += -in_y1 * zoom_y;
                        in_y1 = 0;
                }

                int output_w = get_output_w(edl);
                int output_h = get_output_h(edl);

                if(in_x2 > output_w)
                {
                        out_x2 -= (in_x2 - output_w) * zoom_x;
                        in_x2 = output_w;
                }

                if(in_y2 > output_h)
                {
                        out_y2 -= (in_y2 - output_h) * zoom_y;
                        in_y2 = output_h;
                }
// printf("Canvas::get_transfers 2 %.0f %.0f %.0f %.0f -> %.0f %.0f %.0f %.0f\n",
//                      in_x1, in_y1, in_x2, in_y2, out_x1, out_y1, out_x2, out_y2);

                output_x1 = in_x1;
                output_y1 = in_y1;
                output_x2 = in_x2;
                output_y2 = in_y2;
                canvas_x1 = out_x1;
                canvas_y1 = out_y1;
                canvas_x2 = out_x2;
                canvas_y2 = out_y2;

// Center on canvas
//              if(!scrollbars_exist())
//              {
//                      out_x = canvas_w / 2 - out_w / 2;
//                      out_y = canvas_h / 2 - out_h / 2;
//              }

        }
        else
// The output frame is normalized to the canvas
        {
// Default canvas coords fill the entire canvas
                canvas_x1 = 0;
                canvas_y1 = 0;
                canvas_x2 = canvas_w;
                canvas_y2 = canvas_h;

                if(edl)
                {
// Use EDL aspect ratio to shrink one of the canvas dimensions
                        float out_w = canvas_x2 - canvas_x1;
                        float out_h = canvas_y2 - canvas_y1;
                        if(out_w / out_h > edl->get_aspect_ratio())
                        {
                                out_w = (int)(out_h * edl->get_aspect_ratio() + 0.5);
                                canvas_x1 = canvas_w / 2 - out_w / 2;
                        }
                        else
                        {
                                out_h = (int)(out_w / edl->get_aspect_ratio() + 0.5);
                                canvas_y1 = canvas_h / 2 - out_h / 2;
                        }
                        canvas_x2 = canvas_x1 + out_w;
                        canvas_y2 = canvas_y1 + out_h;

// Get output frame coords from EDL
                        output_x1 = 0;
                        output_y1 = 0;
                        output_x2 = get_output_w(edl);
                        output_y2 = get_output_h(edl);
                }
                else
// No EDL to get aspect ratio or output frame coords from
                {
                        output_x1 = 0;
                        output_y1 = 0;
                        output_x2 = this->output_w;
                        output_y2 = this->output_h;
                }
        }

// Clamp to minimum value
        output_x1 = MAX(0, output_x1);
        output_y1 = MAX(0, output_y1);
        output_x2 = MAX(output_x1, output_x2);
        output_y2 = MAX(output_y1, output_y2);
        canvas_x1 = MAX(0, canvas_x1);
        canvas_y1 = MAX(0, canvas_y1);
        canvas_x2 = MAX(canvas_x1, canvas_x2);
        canvas_y2 = MAX(canvas_y1, canvas_y2);
// printf("Canvas::get_transfers 2 %f,%f %f,%f -> %f,%f %f,%f\n",
// output_x1,
// output_y1,
// output_x2,
// output_y2,
// canvas_x1,
// canvas_y1,
// canvas_x2,
// canvas_y2);
}

int Canvas::scrollbars_exist()
{
        return(use_scrollbars && (xscroll || yscroll));
}

int Canvas::get_output_w(EDL *edl)
{
        if(use_scrollbars)
                return edl->session->output_w;
        else
                return edl->session->output_w;
}

int Canvas::get_output_h(EDL *edl)
{
        if(edl)
        {
                if(use_scrollbars)
                        return edl->session->output_h;
                else
                        return edl->session->output_h;
        }
}



void Canvas::get_scrollbars(EDL *edl, 
        int &canvas_x, 
        int &canvas_y, 
        int &canvas_w, 
        int &canvas_h)
{
        int need_xscroll = 0;
        int need_yscroll = 0;
//      int done = 0;
        float zoom_x, zoom_y, conformed_w, conformed_h;

        if(edl)
        {
                w_needed = edl->session->output_w;
                h_needed = edl->session->output_h;
                w_visible = w_needed;
                h_visible = h_needed;
        }
//printf("Canvas::get_scrollbars 1 %d %d\n", get_xscroll(), get_yscroll());

        if(use_scrollbars)
        {
                w_needed = edl->session->output_w;
                h_needed = edl->session->output_h;
                get_zooms(edl, 0, zoom_x, zoom_y, conformed_w, conformed_h);
//printf("Canvas::get_scrollbars 2 %d %d\n", get_xscroll(), get_yscroll());

//              while(!done)
//              {
                        w_visible = (int)(canvas_w / zoom_x);
                        h_visible = (int)(canvas_h / zoom_y);
//                      done = 1;

//                      if(w_needed > w_visible)
                        if(1)
                        {
                                if(!need_xscroll)
                                {
                                        need_xscroll = 1;
                                        canvas_h -= BC_ScrollBar::get_span(SCROLL_HORIZ);
//                                      done = 0;
                                }
                        }
                        else
                                need_xscroll = 0;

//                      if(h_needed > h_visible)
                        if(1)
                        {
                                if(!need_yscroll)
                                {
                                        need_yscroll = 1;
                                        canvas_w -= BC_ScrollBar::get_span(SCROLL_VERT);
//                                      done = 0;
                                }
                        }
                        else
                                need_yscroll = 0;
//              }
//printf("Canvas::get_scrollbars %d %d %d %d %d %d\n", canvas_w, canvas_h, w_needed, h_needed, w_visible, h_visible);
//printf("Canvas::get_scrollbars 3 %d %d\n", get_xscroll(), get_yscroll());

                w_visible = (int)(canvas_w / zoom_x);
                h_visible = (int)(canvas_h / zoom_y);
        }

        if(need_xscroll)
        {
                if(!xscroll)
                        subwindow->add_subwindow(xscroll = new CanvasXScroll(edl, 
                                this, 
                canvas_x,
                canvas_y + canvas_h,
                                w_needed,
                                get_xscroll(),
                                w_visible,
                                canvas_w));
                else
                        xscroll->reposition_window(canvas_x, canvas_y + canvas_h, canvas_w);

                if(xscroll->get_length() != w_needed ||
                        xscroll->get_handlelength() != w_visible)
                        xscroll->update_length(w_needed, get_xscroll(), w_visible);
        }
        else
        {
                if(xscroll) delete xscroll;
                xscroll = 0;
        }
//printf("Canvas::get_scrollbars 4 %d %d\n", get_xscroll(), get_yscroll());

        if(need_yscroll)
        {
                if(!yscroll)
                        subwindow->add_subwindow(yscroll = new CanvasYScroll(edl, 
                                this,
                canvas_x + canvas_w,
                canvas_y,
                                h_needed,
                                get_yscroll(),
                                h_visible,
                                canvas_h));
                else
                        yscroll->reposition_window(canvas_x + canvas_w, canvas_y, canvas_h);

                if(yscroll->get_length() != edl->session->output_h ||
                        yscroll->get_handlelength() != h_visible)
                        yscroll->update_length(h_needed, get_yscroll(), h_visible);
        }
        else
        {
                if(yscroll) delete yscroll;
                yscroll = 0;
        }
//printf("Canvas::get_scrollbars 5 %d %d\n", get_xscroll(), get_yscroll());
}

void Canvas::reposition_window(EDL *edl, int x, int y, int w, int h)
{
        this->x = x;
        this->y = y;
        this->w = w;
        this->h = h;
        view_x = x;
        view_y = y;
        view_w = w;
        view_h = h;
//printf("Canvas::reposition_window 1\n");
        get_scrollbars(edl, view_x, view_y, view_w, view_h);
//printf("Canvas::reposition_window %d %d %d %d\n", view_x, view_y, view_w, view_h);
        if(canvas_subwindow)
        {
                canvas_subwindow->reposition_window(view_x, view_y, view_w, view_h);

// Need to clear out the garbage in the back
                if(canvas_subwindow->get_video_on())
                {
                        canvas_subwindow->set_color(BLACK);
                        canvas_subwindow->draw_box(0, 
                                0, 
                                get_canvas()->get_w(), 
                                get_canvas()->get_h());
                        canvas_subwindow->flash();
                }
        }
        

        draw_refresh();
//printf("Canvas::reposition_window 2\n");
}

void Canvas::set_cursor(int cursor)
{
        get_canvas()->set_cursor(cursor);
}

int Canvas::get_cursor_x()
{
        return get_canvas()->get_cursor_x();
}

int Canvas::get_cursor_y()
{
        return get_canvas()->get_cursor_y();
}

int Canvas::get_buttonpress()
{
        return get_canvas()->get_buttonpress();
}


int Canvas::create_objects(EDL *edl)
{
        view_x = x;
        view_y = y;
        view_w = w;
        view_h = h;
        get_scrollbars(edl, view_x, view_y, view_w, view_h);

        create_canvas();

        subwindow->add_subwindow(canvas_menu = new CanvasPopup(this));
        canvas_menu->create_objects();

        subwindow->add_subwindow(fullscreen_menu = new CanvasFullScreenPopup(this));
        fullscreen_menu->create_objects();

        return 0;
}

int Canvas::button_press_event()
{
        int result = 0;

        if(get_canvas()->get_buttonpress() == 3)
        {
                if(get_fullscreen())
                        fullscreen_menu->activate_menu();
                else
                        canvas_menu->activate_menu();
                result = 1;
        }

        return result;
}

void Canvas::start_single()
{
        is_processing = 1;
        status_event();
}

void Canvas::stop_single()
{
        is_processing = 0;
        status_event();
}

void Canvas::start_video()
{
        if(get_canvas())
        {
                get_canvas()->start_video();
                status_event();
        }
}

void Canvas::stop_video()
{
        if(get_canvas())
        {
                get_canvas()->stop_video();
                status_event();
        }
}


void Canvas::start_fullscreen()
{
        set_fullscreen(1);
        create_canvas();
}

void Canvas::stop_fullscreen()
{
        set_fullscreen(0);
        create_canvas();
}

void Canvas::create_canvas()
{
        int video_on = 0;
SET_TRACE
        lock_canvas("Canvas::create_canvas");
SET_TRACE


        if(!get_fullscreen())
        {
SET_TRACE
                if(canvas_fullscreen)
                {
                        video_on = canvas_fullscreen->get_video_on();
                        canvas_fullscreen->stop_video();
                }
SET_TRACE

                if(canvas_fullscreen)
                {
                        canvas_fullscreen->hide_window();
//                      delete canvas_fullscreen;
//                      canvas_fullscreen = 0;
                }
SET_TRACE

                if(!canvas_subwindow)
                {
                        subwindow->add_subwindow(canvas_subwindow = new CanvasOutput(this, 
                                view_x, 
                                view_y, 
                                view_w, 
                                view_h));
                }
SET_TRACE
        }
        else
        {
                if(canvas_subwindow)
                {
                        video_on = canvas_subwindow->get_video_on();
                        canvas_subwindow->stop_video();

//                      delete canvas_subwindow;
//                      canvas_subwindow = 0;
                }

                if(!canvas_fullscreen)
                {
                        canvas_fullscreen = new CanvasFullScreen(this,
                        root_w,
                        root_h);
                }
                else
                {
                        canvas_fullscreen->show_window();
                }
        }
SET_TRACE

        if(!video_on) draw_refresh();
SET_TRACE
        if(video_on) get_canvas()->start_video();
SET_TRACE
        unlock_canvas();
}



int Canvas::cursor_leave_event_base(BC_WindowBase *caller)
{
        int result = 0;
        if(cursor_inside) result = cursor_leave_event();
        cursor_inside = 0;
        return result;
}

int Canvas::cursor_enter_event_base(BC_WindowBase *caller)
{
        int result = 0;
        if(caller->is_event_win() && caller->cursor_inside())
        {
                cursor_inside = 1;
                result = cursor_enter_event();
        }
        return result;
}

int Canvas::button_press_event_base(BC_WindowBase *caller)
{
        if(caller->is_event_win() && caller->cursor_inside())
        {
                return button_press_event();
        }
        return 0;
}

int Canvas::keypress_event(BC_WindowBase *caller)
{
        int caller_is_canvas = (caller == get_canvas());
        if(caller->get_keypress() == 'f')
        {
                caller->unlock_window();
                if(get_fullscreen())
                        stop_fullscreen();
                else
                        start_fullscreen();
                if(!caller_is_canvas) caller->lock_window("Canvas::keypress_event 1");
                return 1;
        }
        else
        if(caller->get_keypress() == ESC)
        {
                caller->unlock_window();
                if(get_fullscreen())
                        stop_fullscreen();
                if(!caller_is_canvas) caller->lock_window("Canvas::keypress_event 2");
                return 1;
        }
        return 0;
}

















CanvasOutput::CanvasOutput(Canvas *canvas,
    int x,
    int y,
    int w,
    int h)
 : BC_SubWindow(x, y, w, h, BLACK)
{
        this->canvas = canvas;
}

CanvasOutput::~CanvasOutput()
{
}

int CanvasOutput::cursor_leave_event()
{
        return canvas->cursor_leave_event_base(this);
}

int CanvasOutput::cursor_enter_event()
{
        return canvas->cursor_enter_event_base(this);
}

int CanvasOutput::button_press_event()
{
        return canvas->button_press_event_base(this);
}

int CanvasOutput::button_release_event()
{
        return canvas->button_release_event();
}

int CanvasOutput::cursor_motion_event()
{
        return canvas->cursor_motion_event();
}

int CanvasOutput::keypress_event()
{
        return canvas->keypress_event(this);
}













CanvasFullScreen::CanvasFullScreen(Canvas *canvas,
    int w,
    int h)
 : BC_FullScreen(canvas->subwindow, 
        w, 
        h, 
        BLACK,
        0,
        0,
        0)
{
        this->canvas = canvas;
}

CanvasFullScreen::~CanvasFullScreen()
{
}













CanvasXScroll::CanvasXScroll(EDL *edl, 
        Canvas *canvas, 
    int x, 
    int y, 
        int length, 
        int position, 
        int handle_length,
    int pixels)
 : BC_ScrollBar(x, 
                y, 
                SCROLL_HORIZ, 
                pixels, 
                length, 
                position, 
                handle_length)
{
        this->canvas = canvas;
}

CanvasXScroll::~CanvasXScroll()
{
}

int CanvasXScroll::handle_event()
{
//printf("CanvasXScroll::handle_event %d %d %d\n", get_length(), get_value(), get_handlelength());
        canvas->update_zoom(get_value(), canvas->get_yscroll(), canvas->get_zoom());
        canvas->draw_refresh();
        return 1;
}






CanvasYScroll::CanvasYScroll(EDL *edl, 
        Canvas *canvas, 
    int x, 
    int y, 
        int length, 
        int position, 
        int handle_length,
    int pixels)
 : BC_ScrollBar(x, 
                y, 
                SCROLL_VERT, 
                pixels, 
                length, 
                position, 
                handle_length)
{
        this->canvas = canvas;
}

CanvasYScroll::~CanvasYScroll()
{
}

int CanvasYScroll::handle_event()
{
//printf("CanvasYScroll::handle_event %d %d\n", get_value(), get_length());
        canvas->update_zoom(canvas->get_xscroll(), get_value(), canvas->get_zoom());
        canvas->draw_refresh();
        return 1;
}






CanvasFullScreenPopup::CanvasFullScreenPopup(Canvas *canvas)
 : BC_PopupMenu(0, 
                0, 
                0, 
                "", 
                0)
{
        this->canvas = canvas;
}


void CanvasFullScreenPopup::create_objects()
{
        if(canvas->use_cwindow) add_item(new CanvasPopupAuto(canvas));
        add_item(new CanvasSubWindowItem(canvas));
}


CanvasSubWindowItem::CanvasSubWindowItem(Canvas *canvas)
 : BC_MenuItem(_("Windowed"), "f", 'f')
{
        this->canvas = canvas;
}

int CanvasSubWindowItem::handle_event()
{
// It isn't a problem to delete the canvas from in here because the event
// dispatcher is the canvas subwindow.
        canvas->subwindow->unlock_window();
        canvas->stop_fullscreen();
        canvas->subwindow->lock_window("CanvasSubWindowItem::handle_event");
        return 1;
}








CanvasPopup::CanvasPopup(Canvas *canvas)
 : BC_PopupMenu(0, 
                0, 
                0, 
                "", 
                0)
{
        this->canvas = canvas;
}

CanvasPopup::~CanvasPopup()
{
}

void CanvasPopup::create_objects()
{
        add_item(new CanvasPopupSize(canvas, _("Zoom 25%"), 0.25));
        add_item(new CanvasPopupSize(canvas, _("Zoom 33%"), 0.33));
        add_item(new CanvasPopupSize(canvas, _("Zoom 50%"), 0.5));
        add_item(new CanvasPopupSize(canvas, _("Zoom 75%"), 0.75));
        add_item(new CanvasPopupSize(canvas, _("Zoom 100%"), 1.0));
        add_item(new CanvasPopupSize(canvas, _("Zoom 150%"), 1.5));
        add_item(new CanvasPopupSize(canvas, _("Zoom 200%"), 2.0));
        add_item(new CanvasPopupSize(canvas, _("Zoom 300%"), 3.0));
        add_item(new CanvasPopupSize(canvas, _("Zoom 400%"), 4.0));
        if(canvas->use_cwindow)
        {
                add_item(new CanvasPopupAuto(canvas));
                add_item(new CanvasPopupResetCamera(canvas));
                add_item(new CanvasPopupResetProjector(canvas));
                add_item(toggle_controls = new CanvasToggleControls(canvas));
        }
        if(canvas->use_rwindow)
        {
                add_item(new CanvasPopupResetTranslation(canvas));
        }
        if(canvas->use_vwindow)
        {
                add_item(new CanvasPopupRemoveSource(canvas));
        }
        add_item(new CanvasFullScreenItem(canvas));
}



CanvasPopupAuto::CanvasPopupAuto(Canvas *canvas)
 : BC_MenuItem(_("Zoom Auto"))
{
        this->canvas = canvas;
}

int CanvasPopupAuto::handle_event()
{
        canvas->zoom_auto();
        return 1;
}


CanvasPopupSize::CanvasPopupSize(Canvas *canvas, char *text, float percentage)
 : BC_MenuItem(text)
{
        this->canvas = canvas;
        this->percentage = percentage;
}
CanvasPopupSize::~CanvasPopupSize()
{
}
int CanvasPopupSize::handle_event()
{
        canvas->zoom_resize_window(percentage);
        return 1;
}



CanvasPopupResetCamera::CanvasPopupResetCamera(Canvas *canvas)
 : BC_MenuItem(_("Reset camera"))
{
        this->canvas = canvas;
}
int CanvasPopupResetCamera::handle_event()
{
        canvas->reset_camera();
        return 1;
}



CanvasPopupResetProjector::CanvasPopupResetProjector(Canvas *canvas)
 : BC_MenuItem(_("Reset projector"))
{
        this->canvas = canvas;
}
int CanvasPopupResetProjector::handle_event()
{
        canvas->reset_projector();
        return 1;
}



CanvasPopupResetTranslation::CanvasPopupResetTranslation(Canvas *canvas)
 : BC_MenuItem(_("Reset translation"))
{
        this->canvas = canvas;
}
int CanvasPopupResetTranslation::handle_event()
{
        canvas->reset_translation();
        return 1;
}



CanvasToggleControls::CanvasToggleControls(Canvas *canvas)
 : BC_MenuItem(calculate_text(canvas->get_cwindow_controls()))
{
        this->canvas = canvas;
}
int CanvasToggleControls::handle_event()
{
        canvas->toggle_controls();
        set_text(calculate_text(canvas->get_cwindow_controls()));
        return 1;
}

char* CanvasToggleControls::calculate_text(int cwindow_controls)
{
        if(!cwindow_controls) 
                return _("Show controls");
        else
                return _("Hide controls");
}







CanvasFullScreenItem::CanvasFullScreenItem(Canvas *canvas)
 : BC_MenuItem(_("Fullscreen"), "f", 'f')
{
        this->canvas = canvas;
}
int CanvasFullScreenItem::handle_event()
{
        canvas->subwindow->unlock_window();
        canvas->start_fullscreen();
        canvas->subwindow->lock_window("CanvasFullScreenItem::handle_event");
        return 1;
}









CanvasPopupRemoveSource::CanvasPopupRemoveSource(Canvas *canvas)
 : BC_MenuItem(_("Close source"))
{
        this->canvas = canvas;
}
int CanvasPopupRemoveSource::handle_event()
{
        canvas->close_source();
        return 1;
}

---