/**
 * @file
 * Floating dialog implementation.
 */
/* Author:
 *   Gustav Broberg <broberg@kth.se>
 *
 * Copyright (C) 2007 Authors
 *
 * Released under GNU GPL.  Read the file 'COPYING' for more information.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#if GLIBMM_DISABLE_DEPRECATED && HAVE_GLIBMM_THREADS_H
#include <glibmm/threads.h>
#endif

#include <gtkmm/dialog.h>
#include <gtkmm/stock.h>
#include <glibmm/main.h>
#include <gtk/gtk.h>

#include "floating-behavior.h"
#include "dialog.h"

#include "inkscape.h"
#include "desktop.h"
#include "dialogs/dialog-events.h"
#include "interface.h"
#include "preferences.h"
#include "verbs.h"

namespace Inkscape {
namespace UI {
namespace Dialog {
namespace Behavior {

FloatingBehavior::FloatingBehavior(Dialog &dialog) :
    Behavior(dialog),
    _d (new Gtk::Dialog(_dialog._title))
    ,_dialog_active(_d->property_is_active())
    ,_steps(0)
    ,_trans_focus(Inkscape::Preferences::get()->getDoubleLimited("/dialogs/transparency/on-focus", 0.95, 0.0, 1.0))
    ,_trans_blur(Inkscape::Preferences::get()->getDoubleLimited("/dialogs/transparency/on-blur", 0.50, 0.0, 1.0))
    ,_trans_time(Inkscape::Preferences::get()->getIntLimited("/dialogs/transparency/animate-time", 100, 0, 5000))
{
    hide();

    signal_delete_event().connect(sigc::mem_fun(_dialog, &Inkscape::UI::Dialog::Dialog::_onDeleteEvent));

    sp_transientize(GTK_WIDGET(_d->gobj()));
    _dialog.retransientize_suppress = false;

    _focus_event();
    _dialog_active.signal_changed().connect(sigc::mem_fun(this, &FloatingBehavior::_focus_event));

}

/**
 * A function called when the window gets focus.
 *
 * This function gets called on a focus event.  It figures out how much
 * time is required for a transition, and the number of steps that'll take,
 * and sets up the _trans_timer function to do the work.  If the transition
 * time is set to 0 ms it just calls _trans_timer once with _steps equal to
 * zero so that the transition happens instantaneously.  This occurs on
 * windows as opacity changes cause flicker there.
 */
void FloatingBehavior::_focus_event (void)
{
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    _steps = 0;
    _trans_focus = prefs->getDoubleLimited("/dialogs/transparency/on-focus", 0.95, 0.0, 1.0);
    _trans_blur = prefs->getDoubleLimited("/dialogs/transparency/on-blur", 0.50, 0.0, 1.0);
    _trans_time = prefs->getIntLimited("/dialogs/transparency/animate-time", 100, 0, 5000);

    if (_trans_time != 0) {
        float diff = _trans_focus - _trans_blur;
        if (diff < 0.0) diff *= -1.0;

        while (diff > 0.05) {
            _steps++;
            diff = diff / 2.0;
        }

        if (_steps != 0) {
            Glib::signal_timeout().connect(sigc::mem_fun(this, &FloatingBehavior::_trans_timer), _trans_time / _steps);
        }
    }
    _trans_timer();

    return;
}

/**
 * Move the opacity of a window towards our goal.
 *
 * This is a timer function that is set up by _focus_event to slightly
 * move the opacity of the window along in an animated fashion.  It moves
 * the opacity half way to the goal until it runs out of steps, and then
 * it just forces the goal.
 */
bool FloatingBehavior::_trans_timer (void) {
    // printf("Go go gadget timer: %d\n", _steps);
    if (_steps == 0) {
        if (_dialog_active.get_value()) {
            _d->set_opacity(_trans_focus);
        } else {
            _d->set_opacity(_trans_blur);
        }

        return false;
    }

    float goal, current;
    goal = current = _d->get_opacity();

    if (_dialog_active.get_value()) {
        goal = _trans_focus;
    } else {
        goal = _trans_blur;
    }

    _d->set_opacity(current - ((current - goal) / 2));
    _steps--;
    return true;
}

FloatingBehavior::~FloatingBehavior()
{
    delete _d;
    _d = 0;
}

Behavior *
FloatingBehavior::create(Dialog &dialog)
{
    return new FloatingBehavior(dialog);
}

inline FloatingBehavior::operator Gtk::Widget &()                          { return *_d; }
inline GtkWidget *FloatingBehavior::gobj()                                { return GTK_WIDGET(_d->gobj()); }
inline Gtk::Box* FloatingBehavior::get_vbox()                            { 
#if WITH_GTKMM_3_0
    return _d->get_content_area();
#else
    return _d->get_vbox();
#endif
}
inline void FloatingBehavior::present()                                   { _d->present(); }
inline void FloatingBehavior::hide()                                      { _d->hide(); }
inline void FloatingBehavior::show()                                      { _d->show(); }
inline void FloatingBehavior::show_all_children()                         { _d->show_all_children(); }
inline void FloatingBehavior::resize(int width, int height)               { _d->resize(width, height); }
inline void FloatingBehavior::move(int x, int y)                          { _d->move(x, y); }
inline void FloatingBehavior::set_position(Gtk::WindowPosition position)  { _d->set_position(position); }
inline void FloatingBehavior::set_size_request(int width, int height)     { _d->set_size_request(width, height); }
inline void FloatingBehavior::size_request(Gtk::Requisition &requisition) {
#if WITH_GTKMM_3_0
	Gtk::Requisition requisition_natural;
	_d->get_preferred_size(requisition, requisition_natural); 
#else
	requisition = _d->size_request(); 
#endif
}
inline void FloatingBehavior::get_position(int &x, int &y)                { _d->get_position(x, y); }
inline void FloatingBehavior::get_size(int &width, int &height)           { _d->get_size(width, height); }
inline void FloatingBehavior::set_title(Glib::ustring title)              { _d->set_title(title); }
inline void FloatingBehavior::set_sensitive(bool sensitive)               { _d->set_sensitive(sensitive); }

Glib::SignalProxy0<void> FloatingBehavior::signal_show() { return _d->signal_show(); }
Glib::SignalProxy0<void> FloatingBehavior::signal_hide() { return _d->signal_hide(); }
Glib::SignalProxy1<bool, GdkEventAny *> FloatingBehavior::signal_delete_event () { return _d->signal_delete_event(); }


void
FloatingBehavior::onHideF12()
{
    _dialog.save_geometry();
    hide();
}

void
FloatingBehavior::onShowF12()
{
    show();
    _dialog.read_geometry();
}

void
FloatingBehavior::onShutdown() {}

void
FloatingBehavior::onDesktopActivated (SPDesktop *desktop)
{
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    gint transient_policy = prefs->getIntLimited("/options/transientpolicy/value", 1, 0, 2);

#ifdef WIN32 // Win32 special code to enable transient dialogs
    transient_policy = 2;
#endif

    if (!transient_policy)
        return;

    GtkWindow *dialog_win = GTK_WINDOW(_d->gobj());

    if (_dialog.retransientize_suppress) {
         /* if retransientizing of this dialog is still forbidden after
          * previous call warning turned off because it was confusingly fired
          * when loading many files from command line
          */

         // g_warning("Retranzientize aborted! You're switching windows too fast!");
        return;
    }

    if (dialog_win)
    {
        _dialog.retransientize_suppress = true; // disallow other attempts to retranzientize this dialog

        desktop->setWindowTransient (dialog_win);

        /*
         * This enables "aggressive" transientization,
         * i.e. dialogs always emerging on top when you switch documents. Note
         * however that this breaks "click to raise" policy of a window
         * manager because the switched-to document will be raised at once
         * (so that its transients also could raise)
         */
        if (transient_policy == 2 && ! _dialog._hiddenF12 && !_dialog._user_hidden) {
            // without this, a transient window not always emerges on top
            gtk_window_present (dialog_win);
        }
    }

    // we're done, allow next retransientizing not sooner than after 120 msec
    g_timeout_add (120, (GSourceFunc) sp_retransientize_again, (gpointer) _d);
}


} // namespace Behavior
} // namespace Dialog
} // namespace UI
} // namespace Inkscape

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
