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path: root/e-util/e-selection-model.c
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/*
 * 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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-selection-model.h"

#include <glib/gi18n.h>
#include <gdk/gdkkeysyms.h>

#include "e-marshal.h"

G_DEFINE_TYPE (
    ESelectionModel,
    e_selection_model,
    G_TYPE_OBJECT)

enum {
    CURSOR_CHANGED,
    CURSOR_ACTIVATED,
    SELECTION_CHANGED,
    SELECTION_ROW_CHANGED,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0, };

enum {
    PROP_0,
    PROP_SORTER,
    PROP_SELECTION_MODE,
    PROP_CURSOR_MODE
};

inline static void
add_sorter (ESelectionModel *model,
            ESorter *sorter)
{
    model->sorter = sorter;
    if (sorter) {
        g_object_ref (sorter);
    }
}

inline static void
drop_sorter (ESelectionModel *model)
{
    if (model->sorter) {
        g_object_unref (model->sorter);
    }
    model->sorter = NULL;
}

static void
selection_model_set_property (GObject *object,
                              guint property_id,
                              const GValue *value,
                              GParamSpec *pspec)
{
    ESelectionModel *model = E_SELECTION_MODEL (object);

    switch (property_id) {
        case PROP_SORTER:
            drop_sorter (model);
            add_sorter (
                model, g_value_get_object (value) ?
                E_SORTER (g_value_get_object (value)) : NULL);
            break;

        case PROP_SELECTION_MODE:
            model->mode = g_value_get_int (value);
            if (model->mode == GTK_SELECTION_SINGLE) {
                gint cursor_row = e_selection_model_cursor_row (model);
                gint cursor_col = e_selection_model_cursor_col (model);
                e_selection_model_do_something (model, cursor_row, cursor_col, 0);
            }
            break;

        case PROP_CURSOR_MODE:
            model->cursor_mode = g_value_get_int (value);
            break;
    }
}

static void
selection_model_get_property (GObject *object,
                              guint property_id,
                              GValue *value,
                              GParamSpec *pspec)
{
    ESelectionModel *model = E_SELECTION_MODEL (object);

    switch (property_id) {
        case PROP_SORTER:
            g_value_set_object (value, model->sorter);
            break;

        case PROP_SELECTION_MODE:
            g_value_set_int (value, model->mode);
            break;

        case PROP_CURSOR_MODE:
            g_value_set_int (value, model->cursor_mode);
            break;
    }
}

static void
selection_model_dispose (GObject *object)
{
    ESelectionModel *model;

    model = E_SELECTION_MODEL (object);

    drop_sorter (model);

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

static void
e_selection_model_class_init (ESelectionModelClass *class)
{
    GObjectClass *object_class;

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = selection_model_set_property;
    object_class->get_property = selection_model_get_property;
    object_class->dispose = selection_model_dispose;

    signals[CURSOR_CHANGED] = g_signal_new (
        "cursor_changed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESelectionModelClass, cursor_changed),
        NULL, NULL,
        e_marshal_NONE__INT_INT,
        G_TYPE_NONE, 2,
        G_TYPE_INT,
        G_TYPE_INT);

    signals[CURSOR_ACTIVATED] = g_signal_new (
        "cursor_activated",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESelectionModelClass, cursor_activated),
        NULL, NULL,
        e_marshal_NONE__INT_INT,
        G_TYPE_NONE, 2,
        G_TYPE_INT,
        G_TYPE_INT);

    signals[SELECTION_CHANGED] = g_signal_new (
        "selection_changed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESelectionModelClass, selection_changed),
        NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);

    signals[SELECTION_ROW_CHANGED] = g_signal_new (
        "selection_row_changed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ESelectionModelClass, selection_row_changed),
        NULL, NULL,
        g_cclosure_marshal_VOID__INT,
        G_TYPE_NONE, 1,
        G_TYPE_INT);

    g_object_class_install_property (
        object_class,
        PROP_SORTER,
        g_param_spec_object (
            "sorter",
            "Sorter",
            NULL,
            E_TYPE_SORTER,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SELECTION_MODE,
        g_param_spec_int (
            "selection_mode",
            "Selection Mode",
            NULL,
            GTK_SELECTION_NONE,
            GTK_SELECTION_MULTIPLE,
            GTK_SELECTION_SINGLE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_CURSOR_MODE,
        g_param_spec_int (
            "cursor_mode",
            "Cursor Mode",
            NULL,
            E_CURSOR_LINE,
            E_CURSOR_SPREADSHEET,
            E_CURSOR_LINE,
            G_PARAM_READWRITE));
}

static void
e_selection_model_init (ESelectionModel *model)
{
    model->mode = GTK_SELECTION_MULTIPLE;
    model->cursor_mode = E_CURSOR_SIMPLE;
    model->old_selection = -1;
}

/**
 * e_selection_model_is_row_selected
 * @model: #ESelectionModel to check
 * @n: The row to check
 *
 * This routine calculates whether the given row is selected.
 *
 * Returns: %TRUE if the given row is selected
 */
gboolean
e_selection_model_is_row_selected (ESelectionModel *model,
                                   gint n)
{
    ESelectionModelClass *class;

    g_return_val_if_fail (E_IS_SELECTION_MODEL (model), FALSE);

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_val_if_fail (class->is_row_selected != NULL, FALSE);

    return class->is_row_selected (model, n);
}

/**
 * e_selection_model_foreach
 * @model: #ESelectionModel to traverse
 * @callback: The callback function to call back.
 * @closure: The closure
 *
 * This routine calls the given callback function once for each
 * selected row, passing closure as the closure.
 */
void
e_selection_model_foreach (ESelectionModel *model,
                           EForeachFunc callback,
                           gpointer closure)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));
    g_return_if_fail (callback != NULL);

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->foreach != NULL);

    class->foreach (model, callback, closure);
}

/**
 * e_selection_model_clear
 * @model: #ESelectionModel to clear
 *
 * This routine clears the selection to no rows selected.
 */
void
e_selection_model_clear (ESelectionModel *model)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->clear != NULL);

    class->clear (model);
}

/**
 * e_selection_model_selected_count
 * @model: #ESelectionModel to count
 *
 * This routine calculates the number of rows selected.
 *
 * Returns: The number of rows selected in the given model.
 */
gint
e_selection_model_selected_count (ESelectionModel *model)
{
    ESelectionModelClass *class;

    g_return_val_if_fail (E_IS_SELECTION_MODEL (model), 0);

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_val_if_fail (class->selected_count != NULL, 0);

    return class->selected_count (model);
}

/**
 * e_selection_model_select_all
 * @model: #ESelectionModel to select all
 *
 * This routine selects all the rows in the given
 * #ESelectionModel.
 */
void
e_selection_model_select_all (ESelectionModel *model)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->select_all != NULL);

    class->select_all (model);
}

gint
e_selection_model_row_count (ESelectionModel *model)
{
    ESelectionModelClass *class;

    g_return_val_if_fail (E_IS_SELECTION_MODEL (model), 0);

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_val_if_fail (class->row_count != NULL, 0);

    return class->row_count (model);
}

void
e_selection_model_change_one_row (ESelectionModel *model,
                                  gint row,
                                  gboolean grow)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->change_one_row != NULL);

    return class->change_one_row (model, row, grow);
}

void
e_selection_model_change_cursor (ESelectionModel *model,
                                 gint row,
                                 gint col)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->change_cursor != NULL);

    class->change_cursor (model, row, col);
}

gint
e_selection_model_cursor_row (ESelectionModel *model)
{
    ESelectionModelClass *class;

    g_return_val_if_fail (E_IS_SELECTION_MODEL (model), -1);

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_val_if_fail (class->cursor_row != NULL, -1);

    return class->cursor_row (model);
}

gint
e_selection_model_cursor_col (ESelectionModel *model)
{
    ESelectionModelClass *class;

    g_return_val_if_fail (E_IS_SELECTION_MODEL (model), -1);

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_val_if_fail (class->cursor_col != NULL, -1);

    return class->cursor_col (model);
}

void
e_selection_model_select_single_row (ESelectionModel *model,
                                     gint row)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->select_single_row != NULL);

    class->select_single_row (model, row);
}

void
e_selection_model_toggle_single_row (ESelectionModel *model,
                                     gint row)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->toggle_single_row != NULL);

    class->toggle_single_row (model, row);
}

void
e_selection_model_move_selection_end (ESelectionModel *model,
                                      gint row)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->move_selection_end != NULL);

    class->move_selection_end (model, row);
}

void
e_selection_model_set_selection_end (ESelectionModel *model,
                                     gint row)
{
    ESelectionModelClass *class;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    class = E_SELECTION_MODEL_GET_CLASS (model);
    g_return_if_fail (class->set_selection_end != NULL);

    class->set_selection_end (model, row);
}

/**
 * e_selection_model_do_something
 * @model: #ESelectionModel to do something to.
 * @row: The row to do something in.
 * @col: The col to do something in.
 * @state: The state in which to do something.
 *
 * This routine does whatever is appropriate as if the user clicked
 * the mouse in the given row and column.
 */
void
e_selection_model_do_something (ESelectionModel *model,
                                guint row,
                                guint col,
                                GdkModifierType state)
{
    gint shift_p = state & GDK_SHIFT_MASK;
    gint ctrl_p = state & GDK_CONTROL_MASK;
    gint row_count;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    model->old_selection = -1;

    if (row == -1 && col != -1)
        row = 0;
    if (col == -1 && row != -1)
        col = 0;

    row_count = e_selection_model_row_count (model);
    if (row_count >= 0 && row < row_count) {
        switch (model->mode) {
        case GTK_SELECTION_SINGLE:
            e_selection_model_select_single_row (model, row);
            break;
        case GTK_SELECTION_BROWSE:
        case GTK_SELECTION_MULTIPLE:
            if (shift_p) {
                e_selection_model_set_selection_end (model, row);
            } else {
                if (ctrl_p) {
                    e_selection_model_toggle_single_row (model, row);
                } else {
                    e_selection_model_select_single_row (model, row);
                }
            }
            break;
        default:
            g_return_if_reached ();
            break;
        }
        e_selection_model_change_cursor (model, row, col);
        g_signal_emit (
            model,
            signals[CURSOR_CHANGED], 0,
            row, col);
        g_signal_emit (
            model,
            signals[CURSOR_ACTIVATED], 0,
            row, col);
    }
}

/**
 * e_selection_model_maybe_do_something
 * @model: #ESelectionModel to do something to.
 * @row: The row to do something in.
 * @col: The col to do something in.
 * @state: The state in which to do something.
 *
 * If this row is selected, this routine just moves the cursor row and
 * column.  Otherwise, it does the same thing as
 * e_selection_model_do_something().  This is for being used on
 * right clicks and other events where if the user hit the selection,
 * they don't want it to change.
 */
gboolean
e_selection_model_maybe_do_something (ESelectionModel *model,
                                      guint row,
                                      guint col,
                                      GdkModifierType state)
{
    g_return_val_if_fail (E_IS_SELECTION_MODEL (model), FALSE);

    model->old_selection = -1;

    if (e_selection_model_is_row_selected (model, row)) {
        e_selection_model_change_cursor (model, row, col);
        g_signal_emit (
            model,
            signals[CURSOR_CHANGED], 0,
            row, col);
        return FALSE;
    } else {
        e_selection_model_do_something (model, row, col, state);
        return TRUE;
    }
}

void
e_selection_model_right_click_down (ESelectionModel *model,
                                    guint row,
                                    guint col,
                                    GdkModifierType state)
{
    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    if (model->mode == GTK_SELECTION_SINGLE) {
        model->old_selection =
            e_selection_model_cursor_row (model);
        e_selection_model_select_single_row (model, row);
    } else {
        e_selection_model_maybe_do_something (
            model, row, col, state);
    }
}

void
e_selection_model_right_click_up (ESelectionModel *model)
{
    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    if (model->mode != GTK_SELECTION_SINGLE)
        return;

    if (model->old_selection == -1)
        return;

    e_selection_model_select_single_row (
        model, model->old_selection);
}

void
e_selection_model_select_as_key_press (ESelectionModel *model,
                                       guint row,
                                       guint col,
                                       GdkModifierType state)
{
    gint cursor_activated = TRUE;

    gint shift_p = state & GDK_SHIFT_MASK;
    gint ctrl_p = state & GDK_CONTROL_MASK;

    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    model->old_selection = -1;

    switch (model->mode) {
    case GTK_SELECTION_BROWSE:
    case GTK_SELECTION_MULTIPLE:
        if (shift_p) {
            e_selection_model_set_selection_end (model, row);
        } else if (!ctrl_p) {
            e_selection_model_select_single_row (model, row);
        } else
            cursor_activated = FALSE;
        break;
    case GTK_SELECTION_SINGLE:
        e_selection_model_select_single_row (model, row);
        break;
    default:
        g_return_if_reached ();
        break;
    }
    if (row != -1) {
        e_selection_model_change_cursor (model, row, col);
        g_signal_emit (
            model,
            signals[CURSOR_CHANGED], 0,
            row, col);
        if (cursor_activated)
            g_signal_emit (
                model,
                signals[CURSOR_ACTIVATED], 0,
                row, col);
    }
}

static gint
move_selection (ESelectionModel *model,
                gboolean up,
                GdkModifierType state)
{
    gint row = e_selection_model_cursor_row (model);
    gint col = e_selection_model_cursor_col (model);
    gint row_count;

    /* there is no selected row when row is -1 */
    if (row != -1 && model->sorter != NULL)
        row = e_sorter_model_to_sorted (model->sorter, row);

    if (up)
        row--;
    else
        row++;
    if (row < 0)
        row = 0;
    row_count = e_selection_model_row_count (model);
    if (row >= row_count)
        row = row_count - 1;
    if (model->sorter != NULL)
        row = e_sorter_sorted_to_model (model->sorter, row);

    e_selection_model_select_as_key_press (model, row, col, state);
    return TRUE;
}

/**
 * e_selection_model_key_press
 * @model: #ESelectionModel to affect.
 * @key: The event.
 *
 * This routine does whatever is appropriate as if the user pressed
 * the given key.
 *
 * Returns: %TRUE if the #ESelectionModel used the key.
 */
gboolean
e_selection_model_key_press (ESelectionModel *model,
                             GdkEventKey *key)
{
    g_return_val_if_fail (E_IS_SELECTION_MODEL (model), FALSE);
    g_return_val_if_fail (key != NULL, FALSE);

    model->old_selection = -1;

    switch (key->keyval) {
    case GDK_KEY_Up:
    case GDK_KEY_KP_Up:
        return move_selection (model, TRUE, key->state);
    case GDK_KEY_Down:
    case GDK_KEY_KP_Down:
        return move_selection (model, FALSE, key->state);
    case GDK_KEY_space:
    case GDK_KEY_KP_Space:
        if (model->mode != GTK_SELECTION_SINGLE) {
            gint row = e_selection_model_cursor_row (model);
            gint col = e_selection_model_cursor_col (model);
            if (row == -1)
                break;

            e_selection_model_toggle_single_row (model, row);
            g_signal_emit (
                model,
                signals[CURSOR_ACTIVATED], 0,
                row, col);
            return TRUE;
        }
        break;
    case GDK_KEY_Return:
    case GDK_KEY_KP_Enter:
        if (model->mode != GTK_SELECTION_SINGLE) {
            gint row = e_selection_model_cursor_row (model);
            gint col = e_selection_model_cursor_col (model);
            e_selection_model_select_single_row (model, row);
            g_signal_emit (
                model,
                signals[CURSOR_ACTIVATED], 0,
                row, col);
            return TRUE;
        }
        break;
    case GDK_KEY_Home:
    case GDK_KEY_KP_Home:
        if (model->cursor_mode == E_CURSOR_LINE) {
            gint row = 0;
            gint cursor_col = e_selection_model_cursor_col (model);

            if (model->sorter != NULL)
                row = e_sorter_sorted_to_model (
                    model->sorter, row);
            e_selection_model_select_as_key_press (
                model, row, cursor_col, key->state);
            return TRUE;
        }
        break;
    case GDK_KEY_End:
    case GDK_KEY_KP_End:
        if (model->cursor_mode == E_CURSOR_LINE) {
            gint row = e_selection_model_row_count (model) - 1;
            gint cursor_col = e_selection_model_cursor_col (model);

            if (model->sorter != NULL)
                row = e_sorter_sorted_to_model (
                    model->sorter, row);
            e_selection_model_select_as_key_press (
                model, row, cursor_col, key->state);
            return TRUE;
        }
        break;
    }
    return FALSE;
}

void
e_selection_model_cursor_changed (ESelectionModel *model,
                                  gint row,
                                  gint col)
{
    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    g_signal_emit (model, signals[CURSOR_CHANGED], 0, row, col);
}

void
e_selection_model_cursor_activated (ESelectionModel *model,
                                    gint row,
                                    gint col)
{
    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    g_signal_emit (model, signals[CURSOR_ACTIVATED], 0, row, col);
}

void
e_selection_model_selection_changed (ESelectionModel *model)
{
    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    g_signal_emit (model, signals[SELECTION_CHANGED], 0);
}

void
e_selection_model_selection_row_changed (ESelectionModel *model,
                                         gint row)
{
    g_return_if_fail (E_IS_SELECTION_MODEL (model));

    g_signal_emit (model, signals[SELECTION_ROW_CHANGED], 0, row);
}