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** This file is part of the plugins of the Qt Toolkit.
**
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#include "qgtk2dialoghelpers.h"

#include <qeventloop.h>
#include <qwindow.h>
#include <qcolor.h>
#include <qdebug.h>

#include <private/qguiapplication_p.h>

#undef signals
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>

QT_BEGIN_NAMESPACE

class QGtk2Dialog : public QWindow
{
    Q_OBJECT

public:
    QGtk2Dialog(GtkWidget *gtkWidget);
    ~QGtk2Dialog();

    GtkDialog* gtkDialog() const;

    void exec();
    bool show(Qt::WindowFlags flags, Qt::WindowModality modality, QWindow *parent);
    void hide();

Q_SIGNALS:
    void accept();
    void reject();

protected:
    static void onResponse(QGtk2Dialog *dialog, int response);

private:
    GtkWidget *gtkWidget;
};

QGtk2Dialog::QGtk2Dialog(GtkWidget *gtkWidget) : gtkWidget(gtkWidget)
{
    g_signal_connect_swapped(G_OBJECT(gtkWidget), "response", G_CALLBACK(onResponse), this);
    g_signal_connect(G_OBJECT(gtkWidget), "delete-event", G_CALLBACK(gtk_widget_hide_on_delete), NULL);
}

QGtk2Dialog::~QGtk2Dialog()
{
    gtk_widget_destroy(gtkWidget);
}

GtkDialog* QGtk2Dialog::gtkDialog() const
{
    return GTK_DIALOG(gtkWidget);
}

void QGtk2Dialog::exec()
{
    if (modality() == Qt::ApplicationModal) {
        // block input to the whole app, including other GTK dialogs
        gtk_dialog_run(gtkDialog());
    } else {
        // block input to the window, allow input to other GTK dialogs
        QEventLoop loop;
        connect(this, SIGNAL(accept()), &loop, SLOT(quit()));
        connect(this, SIGNAL(reject()), &loop, SLOT(quit()));
        loop.exec();
    }
}

bool QGtk2Dialog::show(Qt::WindowFlags flags, Qt::WindowModality modality, QWindow *parent)
{
    setParent(parent);
    setFlags(flags);
    setModality(modality);

    gtk_widget_realize(gtkWidget); // creates X window

    if (parent) {
        XSetTransientForHint(gdk_x11_drawable_get_xdisplay(gtkWidget->window),
                             gdk_x11_drawable_get_xid(gtkWidget->window),
                             parent->winId());
    }

    if (modality != Qt::NonModal) {
        gdk_window_set_modal_hint(gtkWidget->window, true);
        QGuiApplicationPrivate::showModalWindow(this);
    }

    gtk_widget_show(gtkWidget);
    return true;
}

void QGtk2Dialog::hide()
{
    QGuiApplicationPrivate::hideModalWindow(this);
    gtk_widget_hide(gtkWidget);
}

void QGtk2Dialog::onResponse(QGtk2Dialog *dialog, int response)
{
    if (response == GTK_RESPONSE_OK)
        emit dialog->accept();
    else
        emit dialog->reject();
}

QGtk2ColorDialogHelper::QGtk2ColorDialogHelper()
{
    d.reset(new QGtk2Dialog(gtk_color_selection_dialog_new("")));
    connect(d.data(), SIGNAL(accept()), this, SLOT(onAccepted()));
    connect(d.data(), SIGNAL(reject()), this, SIGNAL(reject()));

    GtkWidget *gtkColorSelection = gtk_color_selection_dialog_get_color_selection(GTK_COLOR_SELECTION_DIALOG(d->gtkDialog()));
    g_signal_connect_swapped(gtkColorSelection, "color-changed", G_CALLBACK(onColorChanged), this);
}

QGtk2ColorDialogHelper::~QGtk2ColorDialogHelper()
{
}

bool QGtk2ColorDialogHelper::show(Qt::WindowFlags flags, Qt::WindowModality modality, QWindow *parent)
{
    applyOptions();
    return d->show(flags, modality, parent);
}

void QGtk2ColorDialogHelper::exec()
{
    d->exec();
}

void QGtk2ColorDialogHelper::hide()
{
    d->hide();
}

void QGtk2ColorDialogHelper::setCurrentColor(const QColor &color)
{
    GtkDialog *gtkDialog = d->gtkDialog();
    GtkWidget *gtkColorSelection = gtk_color_selection_dialog_get_color_selection(GTK_COLOR_SELECTION_DIALOG(gtkDialog));
    GdkColor gdkColor;
    gdkColor.red = color.red() << 8;
    gdkColor.green = color.green() << 8;
    gdkColor.blue = color.blue() << 8;
    gtk_color_selection_set_current_color(GTK_COLOR_SELECTION(gtkColorSelection), &gdkColor);
    if (color.alpha() < 255) {
        gtk_color_selection_set_has_opacity_control(GTK_COLOR_SELECTION(gtkColorSelection), true);
        gtk_color_selection_set_current_alpha(GTK_COLOR_SELECTION(gtkColorSelection), color.alpha() << 8);
    }
}

QColor QGtk2ColorDialogHelper::currentColor() const
{
    GtkDialog *gtkDialog = d->gtkDialog();
    GtkWidget *gtkColorSelection = gtk_color_selection_dialog_get_color_selection(GTK_COLOR_SELECTION_DIALOG(gtkDialog));
    GdkColor gdkColor;
    gtk_color_selection_get_current_color(GTK_COLOR_SELECTION(gtkColorSelection), &gdkColor);
    guint16 alpha = gtk_color_selection_get_current_alpha(GTK_COLOR_SELECTION(gtkColorSelection));
    return QColor(gdkColor.red >> 8, gdkColor.green >> 8, gdkColor.blue >> 8, alpha >> 8);
}

void QGtk2ColorDialogHelper::onAccepted()
{
    emit accept();
    emit colorSelected(currentColor());
}

void QGtk2ColorDialogHelper::onColorChanged(QGtk2ColorDialogHelper *dialog)
{
    emit dialog->currentColorChanged(dialog->currentColor());
}

void QGtk2ColorDialogHelper::applyOptions()
{
    GtkDialog* gtkDialog = d->gtkDialog();
    gtk_window_set_title(GTK_WINDOW(gtkDialog), options()->windowTitle().toUtf8());

    GtkWidget *gtkColorSelection = gtk_color_selection_dialog_get_color_selection(GTK_COLOR_SELECTION_DIALOG(gtkDialog));
    gtk_color_selection_set_has_opacity_control(GTK_COLOR_SELECTION(gtkColorSelection), options()->testOption(QColorDialogOptions::ShowAlphaChannel));

    GtkWidget *okButton = 0;
    GtkWidget *cancelButton = 0;
    GtkWidget *helpButton = 0;
    g_object_get(G_OBJECT(gtkDialog), "ok-button", &okButton, "cancel-button", &cancelButton, "help-button", &helpButton, NULL);
    if (okButton)
        g_object_set(G_OBJECT(okButton), "visible", !options()->testOption(QColorDialogOptions::NoButtons), NULL);
    if (cancelButton)
        g_object_set(G_OBJECT(cancelButton), "visible", !options()->testOption(QColorDialogOptions::NoButtons), NULL);
    if (helpButton)
        gtk_widget_hide(helpButton);
}

QT_END_NAMESPACE

#include "qgtk2dialoghelpers.moc"