path: root/libempathy-gtk/empathy-cell-renderer-expander.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2006-2007 Imendio AB
 *
 * 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, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 *
 * Authors: Kristian Rietveld <kris@imendio.com>
 */

/* To do:
 *  - should probably cancel animation if model changes
 *  - need to handle case where node-in-animation is removed
 *  - it only handles a single animation at a time; but I guess users
 *    aren't fast enough to trigger two or more animations at once anyway :P
 *    (could guard for this by just cancelling the "old" animation, and
 *     start the new one).
 */

#include <gtk/gtk.h>

#include <libempathy/empathy-utils.h>
#include "empathy-cell-renderer-expander.h"

#define GET_PRIV(obj) EMPATHY_GET_PRIV (obj, EmpathyCellRendererExpander)
typedef struct {
    GtkExpanderStyle     expander_style;
    gint                 expander_size;

    GtkTreeView         *animation_view;
    GtkTreeRowReference *animation_node;
    GtkExpanderStyle     animation_style;
    guint                animation_timeout;
    GdkRectangle         animation_area;

    guint                activatable : 1;
    guint                animation_expanding : 1;
} EmpathyCellRendererExpanderPriv;

enum {
    PROP_0,
    PROP_EXPANDER_STYLE,
    PROP_EXPANDER_SIZE,
    PROP_ACTIVATABLE
};

static void     empathy_cell_renderer_expander_get_property (GObject                         *object,
                                guint                            param_id,
                                GValue                          *value,
                                GParamSpec                      *pspec);
static void     empathy_cell_renderer_expander_set_property (GObject                         *object,
                                guint                            param_id,
                                const GValue                    *value,
                                GParamSpec                      *pspec);
static void     empathy_cell_renderer_expander_finalize     (GObject                         *object);
static void     empathy_cell_renderer_expander_get_size     (GtkCellRenderer                 *cell,
                                GtkWidget                       *widget,
                                GdkRectangle                    *cell_area,
                                gint                            *x_offset,
                                gint                            *y_offset,
                                gint                            *width,
                                gint                            *height);
static void     empathy_cell_renderer_expander_render       (GtkCellRenderer                 *cell,
                                GdkWindow                       *window,
                                GtkWidget                       *widget,
                                GdkRectangle                    *background_area,
                                GdkRectangle                    *cell_area,
                                GdkRectangle                    *expose_area,
                                GtkCellRendererState             flags);
static gboolean empathy_cell_renderer_expander_activate     (GtkCellRenderer                 *cell,
                                GdkEvent                        *event,
                                GtkWidget                       *widget,
                                const gchar                     *path,
                                GdkRectangle                    *background_area,
                                GdkRectangle                    *cell_area,
                                GtkCellRendererState             flags);

G_DEFINE_TYPE (EmpathyCellRendererExpander, empathy_cell_renderer_expander, GTK_TYPE_CELL_RENDERER)

static void
empathy_cell_renderer_expander_init (EmpathyCellRendererExpander *expander)
{
    EmpathyCellRendererExpanderPriv *priv = G_TYPE_INSTANCE_GET_PRIVATE (expander,
        EMPATHY_TYPE_CELL_RENDERER_EXPANDER, EmpathyCellRendererExpanderPriv);

    expander->priv = priv;
    priv->expander_style = GTK_EXPANDER_COLLAPSED;
    priv->expander_size = 12;
    priv->activatable = TRUE;
    priv->animation_node = NULL;

    g_object_set (expander,
              "xpad", 2,
              "ypad", 2,
              "mode", GTK_CELL_RENDERER_MODE_ACTIVATABLE,
              NULL);
}

static void
empathy_cell_renderer_expander_class_init (EmpathyCellRendererExpanderClass *klass)
{
    GObjectClass         *object_class;
    GtkCellRendererClass *cell_class;

    object_class  = G_OBJECT_CLASS (klass);
    cell_class = GTK_CELL_RENDERER_CLASS (klass);

    object_class->finalize = empathy_cell_renderer_expander_finalize;

    object_class->get_property = empathy_cell_renderer_expander_get_property;
    object_class->set_property = empathy_cell_renderer_expander_set_property;

    cell_class->get_size = empathy_cell_renderer_expander_get_size;
    cell_class->render = empathy_cell_renderer_expander_render;
    cell_class->activate = empathy_cell_renderer_expander_activate;

    g_object_class_install_property (object_class,
                     PROP_EXPANDER_STYLE,
                     g_param_spec_enum ("expander-style",
                                "Expander Style",
                                "Style to use when painting the expander",
                                GTK_TYPE_EXPANDER_STYLE,
                                GTK_EXPANDER_COLLAPSED,
                                G_PARAM_READWRITE));

    g_object_class_install_property (object_class,
                     PROP_EXPANDER_SIZE,
                     g_param_spec_int ("expander-size",
                               "Expander Size",
                               "The size of the expander",
                               0,
                               G_MAXINT,
                               12,
                               G_PARAM_READWRITE));

    g_object_class_install_property (object_class,
                     PROP_ACTIVATABLE,
                     g_param_spec_boolean ("activatable",
                                   "Activatable",
                                   "The expander can be activated",
                                   TRUE,
                                   G_PARAM_READWRITE));

    g_type_class_add_private (object_class, sizeof (EmpathyCellRendererExpanderPriv));
}

static void
empathy_cell_renderer_expander_get_property (GObject    *object,
                        guint       param_id,
                        GValue     *value,
                        GParamSpec *pspec)
{
    EmpathyCellRendererExpander     *expander;
    EmpathyCellRendererExpanderPriv *priv;

    expander = EMPATHY_CELL_RENDERER_EXPANDER (object);
    priv = GET_PRIV (expander);

    switch (param_id) {
    case PROP_EXPANDER_STYLE:
        g_value_set_enum (value, priv->expander_style);
        break;

    case PROP_EXPANDER_SIZE:
        g_value_set_int (value, priv->expander_size);
        break;

    case PROP_ACTIVATABLE:
        g_value_set_boolean (value, priv->activatable);
        break;

    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    }
}

static void
empathy_cell_renderer_expander_set_property (GObject      *object,
                        guint         param_id,
                        const GValue *value,
                        GParamSpec   *pspec)
{
    EmpathyCellRendererExpander     *expander;
    EmpathyCellRendererExpanderPriv *priv;

    expander = EMPATHY_CELL_RENDERER_EXPANDER (object);
    priv = GET_PRIV (expander);

    switch (param_id) {
    case PROP_EXPANDER_STYLE:
        priv->expander_style = g_value_get_enum (value);
        break;

    case PROP_EXPANDER_SIZE:
        priv->expander_size = g_value_get_int (value);
        break;

    case PROP_ACTIVATABLE:
        priv->activatable = g_value_get_boolean (value);
        break;

    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    }
}

static void
empathy_cell_renderer_expander_finalize (GObject *object)
{
    EmpathyCellRendererExpanderPriv *priv;

    priv = GET_PRIV (object);

    if (priv->animation_timeout) {
        g_source_remove (priv->animation_timeout);
        priv->animation_timeout = 0;
    }

    if (priv->animation_node) {
        gtk_tree_row_reference_free (priv->animation_node);
    }

    (* G_OBJECT_CLASS (empathy_cell_renderer_expander_parent_class)->finalize) (object);
}

GtkCellRenderer *
empathy_cell_renderer_expander_new (void)
{
    return g_object_new (EMPATHY_TYPE_CELL_RENDERER_EXPANDER, NULL);
}

static void
empathy_cell_renderer_expander_get_size (GtkCellRenderer *cell,
                    GtkWidget       *widget,
                    GdkRectangle    *cell_area,
                    gint            *x_offset,
                    gint            *y_offset,
                    gint            *width,
                    gint            *height)
{
    EmpathyCellRendererExpander     *expander;
    EmpathyCellRendererExpanderPriv *priv;
    gfloat xalign, yalign;
    guint xpad, ypad;

    expander = (EmpathyCellRendererExpander *) cell;
    priv = GET_PRIV (expander);

    g_object_get (cell,
              "xalign", &xalign,
              "yalign", &yalign,
              "xpad", &xpad,
              "ypad", &ypad,
              NULL);

    if (cell_area) {
        if (x_offset) {
            *x_offset = xalign * (cell_area->width - (priv->expander_size + (2 * xpad)));
            *x_offset = MAX (*x_offset, 0);
        }

        if (y_offset) {
            *y_offset = yalign * (cell_area->height - (priv->expander_size + (2 * ypad)));
            *y_offset = MAX (*y_offset, 0);
        }
    } else {
        if (x_offset)
            *x_offset = 0;

        if (y_offset)
            *y_offset = 0;
    }

    if (width)
        *width = xpad * 2 + priv->expander_size;

    if (height)
        *height = ypad * 2 + priv->expander_size;
}

static void
empathy_cell_renderer_expander_render (GtkCellRenderer      *cell,
                      GdkWindow            *window,
                      GtkWidget            *widget,
                      GdkRectangle         *background_area,
                      GdkRectangle         *cell_area,
                      GdkRectangle         *expose_area,
                      GtkCellRendererState  flags)
{
    EmpathyCellRendererExpander     *expander;
    EmpathyCellRendererExpanderPriv *priv;
    GtkExpanderStyle                expander_style;
    gint                            x_offset, y_offset;
    guint                           xpad, ypad;


    expander = (EmpathyCellRendererExpander *) cell;
    priv = GET_PRIV (expander);

    if (priv->animation_node) {
        GtkTreePath *path;
        GdkRectangle rect;

        /* Not sure if I like this ... */
        path = gtk_tree_row_reference_get_path (priv->animation_node);
        gtk_tree_view_get_background_area (priv->animation_view, path,
                           NULL, &rect);
        gtk_tree_path_free (path);

        if (background_area->y == rect.y)
            expander_style = priv->animation_style;
        else
            expander_style = priv->expander_style;
    } else
        expander_style = priv->expander_style;

    empathy_cell_renderer_expander_get_size (cell, widget, cell_area,
                        &x_offset, &y_offset,
                        NULL, NULL);

    g_object_get (cell,
              "xpad", &xpad,
              "ypad", &ypad,
              NULL);

    gtk_paint_expander (gtk_widget_get_style (widget),
                window,
                GTK_STATE_NORMAL,
                expose_area,
                widget,
                "treeview",
                cell_area->x + x_offset + xpad + priv->expander_size / 2,
                cell_area->y + y_offset + ypad + priv->expander_size / 2,
                expander_style);
}

static void
invalidate_node (GtkTreeView *tree_view,
         GtkTreePath *path)
{
       GdkWindow    *bin_window;
       GdkRectangle  rect;

       bin_window = gtk_tree_view_get_bin_window (tree_view);

       gtk_tree_view_get_background_area (tree_view, path, NULL, &rect);

       rect.x = 0;
       rect.width = GTK_WIDGET (tree_view)->allocation.width;

       gdk_window_invalidate_rect (bin_window, &rect, TRUE);
}

static gboolean
do_animation (EmpathyCellRendererExpander *expander)
{
    EmpathyCellRendererExpanderPriv *priv;
    GtkTreePath                    *path;
    gboolean                        done = FALSE;

    priv = GET_PRIV (expander);

    if (priv->animation_expanding) {
        if (priv->animation_style == GTK_EXPANDER_SEMI_COLLAPSED)
            priv->animation_style = GTK_EXPANDER_SEMI_EXPANDED;
        else if (priv->animation_style == GTK_EXPANDER_SEMI_EXPANDED) {
            priv->animation_style = GTK_EXPANDER_EXPANDED;
            done = TRUE;
        }
    } else {
        if (priv->animation_style == GTK_EXPANDER_SEMI_EXPANDED)
            priv->animation_style = GTK_EXPANDER_SEMI_COLLAPSED;
        else if (priv->animation_style == GTK_EXPANDER_SEMI_COLLAPSED) {
            priv->animation_style = GTK_EXPANDER_COLLAPSED;
            done = TRUE;
        }
    }

    path = gtk_tree_row_reference_get_path (priv->animation_node);
    invalidate_node (priv->animation_view, path);
    gtk_tree_path_free (path);

    if (done) {
        gtk_tree_row_reference_free (priv->animation_node);
        priv->animation_node = NULL;
        priv->animation_timeout = 0;
    }

    return !done;
}

static gboolean
animation_timeout (gpointer data)
{
    gboolean retval;

    GDK_THREADS_ENTER ();

    retval = do_animation (data);

    GDK_THREADS_LEAVE ();

    return retval;
}

static void
empathy_cell_renderer_expander_start_animation (EmpathyCellRendererExpander *expander,
                           GtkTreeView                *tree_view,
                           GtkTreePath                *path,
                           gboolean                    expanding,
                           GdkRectangle               *background_area)
{
    EmpathyCellRendererExpanderPriv *priv;

    priv = GET_PRIV (expander);

    if (expanding) {
        priv->animation_style = GTK_EXPANDER_SEMI_COLLAPSED;
    } else {
        priv->animation_style = GTK_EXPANDER_SEMI_EXPANDED;
    }

    invalidate_node (tree_view, path);

    priv->animation_expanding = expanding;
    priv->animation_view = tree_view;
    priv->animation_node = gtk_tree_row_reference_new (gtk_tree_view_get_model (tree_view), path);
    priv->animation_timeout = g_timeout_add (50, animation_timeout, expander);
}

static gboolean
empathy_cell_renderer_expander_activate (GtkCellRenderer      *cell,
                    GdkEvent             *event,
                    GtkWidget            *widget,
                    const gchar          *path_string,
                    GdkRectangle         *background_area,
                    GdkRectangle         *cell_area,
                    GtkCellRendererState  flags)
{
    EmpathyCellRendererExpander     *expander;
    EmpathyCellRendererExpanderPriv *priv;
    GtkTreePath                    *path;
    gboolean                        animate;
    gboolean                        expanding;

    expander = EMPATHY_CELL_RENDERER_EXPANDER (cell);
    priv = GET_PRIV (cell);

    if (!GTK_IS_TREE_VIEW (widget) || !priv->activatable)
        return FALSE;

    path = gtk_tree_path_new_from_string (path_string);

    if (gtk_tree_path_get_depth (path) > 1) {
        gtk_tree_path_free (path);
        return TRUE;
    }

    g_object_get (gtk_widget_get_settings (GTK_WIDGET (widget)),
              "gtk-enable-animations", &animate,
              NULL);

    if (gtk_tree_view_row_expanded (GTK_TREE_VIEW (widget), path)) {
        gtk_tree_view_collapse_row (GTK_TREE_VIEW (widget), path);
        expanding = FALSE;
    } else {
        gtk_tree_view_expand_row (GTK_TREE_VIEW (widget), path, FALSE);
        expanding = TRUE;
    }

    if (animate) {
        empathy_cell_renderer_expander_start_animation (expander,
                                   GTK_TREE_VIEW (widget),
                                   path,
                                   expanding,
                                   background_area);
    }

    gtk_tree_path_free (path);

    return TRUE;
}