/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2006 Rivo Laks <rivolaks@hot.ee>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/

#include "dialogparent.h"

namespace KWin
{

KWIN_EFFECT(dialogparent, DialogParentEffect)

DialogParentEffect::DialogParentEffect()
{
    reconfigure(ReconfigureAll);
    connect(effects, SIGNAL(windowClosed(EffectWindow*)), this, SLOT(slotWindowClosed(EffectWindow*)));
    connect(effects, SIGNAL(windowActivated(EffectWindow*)), this, SLOT(slotWindowActivated(EffectWindow*)));
}

void DialogParentEffect::reconfigure(ReconfigureFlags)
{
    // How long does it take for the effect to get it's full strength (in ms)
    changeTime = animationTime(200);
}

void DialogParentEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData& data, int time)
{
    // Check if this window has a modal dialog and change the window's
    //  effect's strength accordingly
    bool hasDialog = w->findModal() != NULL;
    if (hasDialog) {
        // Increase effect strength of this window
        effectStrength[w] = qMin(1.0, effectStrength[w] + time / changeTime);
    } else {
        effectStrength[w] = qMax(0.0, effectStrength[w] - time / changeTime);
    }

    // Call the next effect
    effects->prePaintWindow(w, data, time);
}

void DialogParentEffect::paintWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data)
{
    double s = effectStrength[w];
    if (s > 0.0f) {
        // Brightness will be within [1.0; 0.6]
        data.brightness *= (1.0 - s * 0.4);
        // Saturation within [1.0; 0.4]
        data.saturation *= (1.0 - s * 0.6);
    }

    // Call the next effect.
    effects->paintWindow(w, mask, region, data);
}

void DialogParentEffect::postPaintWindow(EffectWindow* w)
{
    double s = effectStrength[w];

    // If strength is between 0 and 1, the effect is still in progress and the
    //  window has to be repainted during the next pass
    if (s > 0.0 && s < 1.0)
        w->addRepaintFull(); // trigger next animation repaint

    // Call the next effect.
    effects->postPaintWindow(w);
}

void DialogParentEffect::slotWindowActivated(EffectWindow* w)
{
    // If this window is a dialog, we need to repaint it's parent window, so
    //  that the effect could be run for it
    // Set the window to be faded (or NULL if no window is active).
    if (w && w->isModal()) {
        // w is a modal dialog
        EffectWindowList mainwindows = w->mainWindows();
        foreach (EffectWindow * parent, mainwindows)
        parent->addRepaintFull();
    }
}

void DialogParentEffect::slotWindowClosed(EffectWindow* w)
{
    // If this window is a dialog, we need to repaint it's parent window, so
    //  that the effect could be run for it
    // Set the window to be faded (or NULL if no window is active).
    if (w && w->isModal()) {
        // w is a modal dialog
        EffectWindowList mainwindows = w->mainWindows();
        foreach (EffectWindow * parent, mainwindows)
        parent->addRepaintFull();
    }
}

} // namespace