path: root/widgets/misc/e-hinted-entry.c

/*
 * e-hinted-entry.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include "e-hinted-entry.h"

#define E_HINTED_ENTRY_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_HINTED_ENTRY, EHintedEntryPrivate))

struct _EHintedEntryPrivate {
    gchar *hint;
    guint hint_shown : 1;
};

enum {
    PROP_0,
    PROP_HINT,
    PROP_HINT_SHOWN
};

static gpointer parent_class;

static void
hinted_entry_hide_hint (EHintedEntry *entry)
{
    entry->priv->hint_shown = FALSE;

    gtk_entry_set_text (GTK_ENTRY (entry), "");

    gtk_widget_modify_text (GTK_WIDGET (entry), GTK_STATE_NORMAL, NULL);

    g_object_notify (G_OBJECT (entry), "hint-shown");
}

static void
hinted_entry_show_hint (EHintedEntry *entry)
{
    GtkStyle *style;
    const GdkColor *color;
    const gchar *hint;

    entry->priv->hint_shown = TRUE;

    hint = e_hinted_entry_get_hint (entry);
    gtk_entry_set_text (GTK_ENTRY (entry), hint);

    style = gtk_widget_get_style (GTK_WIDGET (entry));
    color = &style->text[GTK_STATE_INSENSITIVE];
    gtk_widget_modify_text (GTK_WIDGET (entry), GTK_STATE_NORMAL, color);

    g_object_notify (G_OBJECT (entry), "hint-shown");
}

static void
hinted_entry_set_property (GObject *object,
                           guint property_id,
                           const GValue *value,
                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_HINT:
            e_hinted_entry_set_hint (
                E_HINTED_ENTRY (object),
                g_value_get_string (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
hinted_entry_get_property (GObject *object,
                           guint property_id,
                           GValue *value,
                           GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_HINT:
            g_value_set_string (
                value, e_hinted_entry_get_hint (
                E_HINTED_ENTRY (object)));
            return;

        case PROP_HINT_SHOWN:
            g_value_set_boolean (
                value, e_hinted_entry_get_hint_shown (
                E_HINTED_ENTRY (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
hinted_entry_finalize (GObject *object)
{
    EHintedEntryPrivate *priv;

    priv = E_HINTED_ENTRY_GET_PRIVATE (object);

    g_free (priv->hint);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static gboolean
hinted_entry_focus_in_event (GtkWidget *widget,
                             GdkEventFocus *event)
{
    EHintedEntry *entry = E_HINTED_ENTRY (widget);

    if (e_hinted_entry_get_hint_shown (entry))
        hinted_entry_hide_hint (entry);

    /* Chain up to parent's focus_in_event() method. */
    return GTK_WIDGET_CLASS (parent_class)->
        focus_in_event (widget, event);
}

static gboolean
hinted_entry_focus_out_event (GtkWidget *widget,
                              GdkEventFocus *event)
{
    EHintedEntry *entry = E_HINTED_ENTRY (widget);
    const gchar *text;

    text = e_hinted_entry_get_text (entry);

    if (text == NULL || *text == '\0')
        hinted_entry_show_hint (E_HINTED_ENTRY (widget));

    /* Chain up to parent's focus_out_event() method. */
    return GTK_WIDGET_CLASS (parent_class)->
        focus_out_event (widget, event);
}

static void
hinted_entry_class_init (EHintedEntryClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;

    parent_class = g_type_class_peek_parent (class);
    g_type_class_add_private (class, sizeof (EHintedEntryPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = hinted_entry_set_property;
    object_class->get_property = hinted_entry_get_property;
    object_class->finalize = hinted_entry_finalize;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->focus_in_event = hinted_entry_focus_in_event;
    widget_class->focus_out_event = hinted_entry_focus_out_event;

    g_object_class_install_property (
        object_class,
        PROP_HINT,
        g_param_spec_string (
            "hint",
            "Hint",
            NULL,
            NULL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_HINT_SHOWN,
        g_param_spec_boolean (
            "hint-shown",
            "Hint Shown",
            NULL,
            FALSE,
            G_PARAM_READABLE));
}

static void
hinted_entry_init (EHintedEntry *entry)
{
    entry->priv = E_HINTED_ENTRY_GET_PRIVATE (entry);
    entry->priv->hint = g_strdup ("");  /* hint must never be NULL */
    hinted_entry_show_hint (entry);
}

GType
e_hinted_entry_get_type (void)
{
    static GType type = 0;

    if (G_UNLIKELY (type == 0)) {
        static const GTypeInfo type_info = {
            sizeof (EHintedEntryClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) hinted_entry_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,  /* class_data */
            sizeof (EHintedEntry),
            0,     /* n_preallocs */
            (GInstanceInitFunc) hinted_entry_init,
            NULL   /* value_table */
        };

        type = g_type_register_static (
            GTK_TYPE_ENTRY, "EHintedEntry", &type_info, 0);
    }

    return type;
}

GtkWidget *
e_hinted_entry_new (void)
{
    return g_object_new (E_TYPE_HINTED_ENTRY, NULL);
}

const gchar *
e_hinted_entry_get_hint (EHintedEntry *entry)
{
    g_return_val_if_fail (E_IS_HINTED_ENTRY (entry), NULL);

    return entry->priv->hint;
}

void
e_hinted_entry_set_hint (EHintedEntry *entry,
                         const gchar *hint)
{
    g_return_if_fail (E_IS_HINTED_ENTRY (entry));

    if (hint == NULL)
        hint = "";

    g_free (entry->priv->hint);
    entry->priv->hint = g_strdup (hint);

    if (e_hinted_entry_get_hint_shown (entry))
        gtk_entry_set_text (GTK_ENTRY (entry), hint);

    g_object_notify (G_OBJECT (entry), "hint");
}

gboolean
e_hinted_entry_get_hint_shown (EHintedEntry *entry)
{
    g_return_val_if_fail (E_IS_HINTED_ENTRY (entry), FALSE);

    return entry->priv->hint_shown;
}

const gchar *
e_hinted_entry_get_text (EHintedEntry *entry)
{
    /* XXX This clumsily overrides gtk_entry_get_text(). */

    g_return_val_if_fail (E_IS_HINTED_ENTRY (entry), NULL);

    if (e_hinted_entry_get_hint_shown (entry))
        return "";

    return gtk_entry_get_text (GTK_ENTRY (entry));
}

void
e_hinted_entry_set_text (EHintedEntry *entry,
                         const gchar *text)
{
    /* XXX This clumsily overrides gtk_entry_set_text(). */

    g_return_if_fail (E_IS_HINTED_ENTRY (entry));

    if (text == NULL)
        text = "";

    if (*text == '\0' && !gtk_widget_has_focus (GTK_WIDGET (entry)))
        hinted_entry_show_hint (entry);
    else {
        hinted_entry_hide_hint (entry);
        gtk_entry_set_text (GTK_ENTRY (entry), text);
    }
}