path: root/widgets/misc/e-selection-model.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * e-selection-model.c: a Selection Model
 *
 * Author:
 *   Christopher James Lahey <clahey@ximian.com>
 *
 * (C) 2000, 2001 Ximian, Inc.
 */
#include <config.h>
#include <gtk/gtksignal.h>
#include "e-selection-model.h"
#include "gal/util/e-util.h"
#include <gdk/gdkkeysyms.h>

#define ESM_CLASS(e) ((ESelectionModelClass *)((GtkObject *)e)->klass)

#define PARENT_TYPE gtk_object_get_type ()

static GtkObjectClass *e_selection_model_parent_class;

enum {
    CURSOR_CHANGED,
    CURSOR_ACTIVATED,
    SELECTION_CHANGED,
    LAST_SIGNAL
};

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

enum {
    ARG_0,
    ARG_SORTER,
    ARG_SELECTION_MODE,
    ARG_CURSOR_MODE,
};

inline static void
add_sorter(ESelectionModel *esm, ESorter *sorter)
{
    esm->sorter = sorter;
    if (sorter) {
        gtk_object_ref(GTK_OBJECT(sorter));
    }
}

inline static void
drop_sorter(ESelectionModel *esm)
{
    if (esm->sorter) {
        gtk_object_unref(GTK_OBJECT(esm->sorter));
    }
    esm->sorter = NULL;
}

static void
esm_destroy (GtkObject *object)
{
    ESelectionModel *esm;

    esm = E_SELECTION_MODEL (object);

    drop_sorter(esm);
}

static void
esm_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ESelectionModel *esm = E_SELECTION_MODEL (o);

    switch (arg_id){
    case ARG_SORTER:
        GTK_VALUE_OBJECT (*arg) = GTK_OBJECT(esm->sorter);
        break;

    case ARG_SELECTION_MODE:
        GTK_VALUE_ENUM(*arg) = esm->mode;
        break;

    case ARG_CURSOR_MODE:
        GTK_VALUE_ENUM(*arg) = esm->cursor_mode;
        break;
    }
}

static void
esm_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ESelectionModel *esm = E_SELECTION_MODEL (o);
    
    switch (arg_id){
    case ARG_SORTER:
        drop_sorter(esm);
        add_sorter(esm, GTK_VALUE_OBJECT (*arg) ? E_SORTER(GTK_VALUE_OBJECT (*arg)) : NULL);
        break;

    case ARG_SELECTION_MODE:
        esm->mode = GTK_VALUE_ENUM(*arg);
        if (esm->mode == GTK_SELECTION_SINGLE) {
            int cursor_row = e_selection_model_cursor_row(esm);
            int cursor_col = e_selection_model_cursor_col(esm);
            e_selection_model_do_something(esm, cursor_row, cursor_col, 0);
        }
        break;

    case ARG_CURSOR_MODE:
        esm->cursor_mode = GTK_VALUE_ENUM(*arg);
        break;
    }
}

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

static void
e_selection_model_class_init (ESelectionModelClass *klass)
{
    GtkObjectClass *object_class;

    e_selection_model_parent_class = gtk_type_class (gtk_object_get_type ());

    object_class = GTK_OBJECT_CLASS(klass);

    object_class->destroy = esm_destroy;
    object_class->get_arg = esm_get_arg;
    object_class->set_arg = esm_set_arg;

    e_selection_model_signals [CURSOR_CHANGED] =
        gtk_signal_new ("cursor_changed",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ESelectionModelClass, cursor_changed),
                gtk_marshal_NONE__INT_INT,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_INT);

    e_selection_model_signals [CURSOR_ACTIVATED] =
        gtk_signal_new ("cursor_activated",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ESelectionModelClass, cursor_activated),
                gtk_marshal_NONE__INT_INT,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_INT);

    e_selection_model_signals [SELECTION_CHANGED] =
        gtk_signal_new ("selection_changed",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ESelectionModelClass, selection_changed),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    klass->cursor_changed     = NULL;
    klass->cursor_activated   = NULL;
    klass->selection_changed  = NULL;

    klass->is_row_selected    = NULL;
    klass->foreach            = NULL;
    klass->clear              = NULL;
    klass->selected_count     = NULL;
    klass->select_all         = NULL;
    klass->invert_selection   = NULL;
    klass->row_count          = NULL;

    klass->change_one_row     = NULL;
    klass->change_cursor      = NULL;
    klass->cursor_row         = NULL;
    klass->cursor_col         = NULL;

    klass->select_single_row  = NULL;
    klass->toggle_single_row  = NULL;
    klass->move_selection_end = NULL;
    klass->set_selection_end  = NULL;


    gtk_object_class_add_signals (object_class, e_selection_model_signals, LAST_SIGNAL);

    gtk_object_add_arg_type ("ESelectionModel::sorter", GTK_TYPE_OBJECT,
                 GTK_ARG_READWRITE, ARG_SORTER);
    gtk_object_add_arg_type ("ESelectionModel::selection_mode", GTK_TYPE_ENUM,
                 GTK_ARG_READWRITE, ARG_SELECTION_MODE);
    gtk_object_add_arg_type ("ESelectionModel::cursor_mode", GTK_TYPE_ENUM,
                 GTK_ARG_READWRITE, ARG_CURSOR_MODE);
}

E_MAKE_TYPE(e_selection_model, "ESelectionModel", ESelectionModel,
        e_selection_model_class_init, e_selection_model_init, PARENT_TYPE);

/** 
 * e_selection_model_is_row_selected
 * @selection: #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 *selection,
                   gint                 n)
{
    if (ESM_CLASS(selection)->is_row_selected)
        return ESM_CLASS(selection)->is_row_selected (selection, n);
    else
        return FALSE;
}

/** 
 * e_selection_model_foreach
 * @selection: #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 *selection,
                   EForeachFunc callback,
                   gpointer closure)
{
    if (ESM_CLASS(selection)->foreach)
        ESM_CLASS(selection)->foreach (selection, callback, closure);
}

/** 
 * e_selection_model_clear
 * @selection: #ESelectionModel to clear
 *
 * This routine clears the selection to no rows selected.
 */
void
e_selection_model_clear(ESelectionModel *selection)
{
    if (ESM_CLASS(selection)->clear)
        ESM_CLASS(selection)->clear (selection);
}

/** 
 * e_selection_model_selected_count
 * @selection: #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 *selection)
{
    if (ESM_CLASS(selection)->selected_count)
        return ESM_CLASS(selection)->selected_count (selection);
    else
        return 0;
}

/** 
 * e_selection_model_select_all
 * @selection: #ESelectionModel to select all
 *
 * This routine selects all the rows in the given
 * #ESelectionModel.
 */
void
e_selection_model_select_all (ESelectionModel *selection)
{
    if (ESM_CLASS(selection)->select_all)
        ESM_CLASS(selection)->select_all (selection);
}

/** 
 * e_selection_model_invert_selection
 * @selection: #ESelectionModel to invert
 *
 * This routine inverts all the rows in the given
 * #ESelectionModel.
 */
void
e_selection_model_invert_selection (ESelectionModel *selection)
{
    if (ESM_CLASS(selection)->invert_selection)
        ESM_CLASS(selection)->invert_selection (selection);
}

int
e_selection_model_row_count (ESelectionModel *selection)
{
    if (ESM_CLASS(selection)->row_count)
        return ESM_CLASS(selection)->row_count (selection);
    else
        return 0;
}

void
e_selection_model_change_one_row(ESelectionModel *selection, int row, gboolean grow)
{
    if (ESM_CLASS(selection)->change_one_row)
        ESM_CLASS(selection)->change_one_row (selection, row, grow);
}

void
e_selection_model_change_cursor (ESelectionModel *selection, int row, int col)
{
    if (ESM_CLASS(selection)->change_cursor)
        ESM_CLASS(selection)->change_cursor (selection, row, col);
}

int
e_selection_model_cursor_row (ESelectionModel *selection)
{
    if (ESM_CLASS(selection)->cursor_row)
        return ESM_CLASS(selection)->cursor_row (selection);
    else
        return -1;
}

int
e_selection_model_cursor_col (ESelectionModel *selection)
{
    if (ESM_CLASS(selection)->cursor_col)
        return ESM_CLASS(selection)->cursor_col (selection);
    else
        return -1;
}

void
e_selection_model_select_single_row (ESelectionModel *selection, int row)
{
    if (ESM_CLASS(selection)->select_single_row)
        ESM_CLASS(selection)->select_single_row (selection, row);
}

void
e_selection_model_toggle_single_row (ESelectionModel *selection, int row)
{
    if (ESM_CLASS(selection)->toggle_single_row)
        ESM_CLASS(selection)->toggle_single_row (selection, row);
}

void
e_selection_model_move_selection_end (ESelectionModel *selection, int row)
{
    if (ESM_CLASS(selection)->move_selection_end)
        ESM_CLASS(selection)->move_selection_end (selection, row);
}

void
e_selection_model_set_selection_end (ESelectionModel *selection, int row)
{
    if (ESM_CLASS(selection)->set_selection_end)
        ESM_CLASS(selection)->set_selection_end (selection, row);
}

/** 
 * e_selection_model_do_something
 * @selection: #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 *selection,
                guint                 row,
                guint                 col,
                GdkModifierType       state)
{
    gint shift_p = state & GDK_SHIFT_MASK;
    gint ctrl_p = state & GDK_CONTROL_MASK;
    int row_count;

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

    row_count = e_selection_model_row_count(selection);
    if (row_count >= 0 && row < row_count) {
        switch (selection->mode) {
        case GTK_SELECTION_SINGLE:
            e_selection_model_select_single_row (selection, row);
            break;
        case GTK_SELECTION_BROWSE:
        case GTK_SELECTION_MULTIPLE:
        case GTK_SELECTION_EXTENDED:
            if (shift_p) {
                e_selection_model_set_selection_end (selection, row);
            } else {
                if (ctrl_p) {
                    e_selection_model_toggle_single_row (selection, row);
                } else {
                    e_selection_model_select_single_row (selection, row);
                }
            }
            break;
        }
        if (e_selection_model_cursor_row(selection) != row ||
            e_selection_model_cursor_col(selection) != col) {
            e_selection_model_change_cursor(selection, row, col);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_CHANGED], row, col);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], row, col);
        }
    }
}

/** 
 * e_selection_model_maybe_do_something
 * @selection: #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.
 */
void
e_selection_model_maybe_do_something      (ESelectionModel *selection,
                       guint            row,
                       guint            col,
                       GdkModifierType  state)
{
    if (e_selection_model_is_row_selected(selection, row)) {
        e_selection_model_change_cursor(selection, row, col);
        gtk_signal_emit(GTK_OBJECT(selection),
                e_selection_model_signals[CURSOR_CHANGED], row, col);
    } else {
        e_selection_model_do_something(selection, row, col, state);
    }
}

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

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

    row = e_sorter_model_to_sorted(selection->sorter, row);
    if (up)
        row--;
    else
        row++;
    if (row < 0)
        row = 0;
    row_count = e_selection_model_row_count(selection);
    if (row >= row_count)
        row = row_count - 1;
    row = e_sorter_sorted_to_model(selection->sorter, row);

    switch (selection->mode) {
    case GTK_SELECTION_BROWSE:
        if (shift_p) {
            e_selection_model_set_selection_end (selection, row);
        } else if (!ctrl_p) {
            e_selection_model_select_single_row (selection, row);
        } else
            cursor_activated = FALSE;
        break;
    case GTK_SELECTION_SINGLE:
    case GTK_SELECTION_MULTIPLE:
    case GTK_SELECTION_EXTENDED:
        e_selection_model_select_single_row (selection, row);
        break;
    }
    if (row != -1) {
        e_selection_model_change_cursor(selection, row, col);
        gtk_signal_emit(GTK_OBJECT(selection),
                e_selection_model_signals[CURSOR_CHANGED], row, col);
        if (cursor_activated)
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], row, col);
    }
    return TRUE;
}

/** 
 * e_selection_model_key_press
 * @selection: #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.
 */
gint
e_selection_model_key_press      (ESelectionModel *selection,
                  GdkEventKey          *key)
{
    switch (key->keyval) {
    case GDK_Up:
        return move_selection(selection, TRUE, key->state);
        break;
    case GDK_Down:
        return move_selection(selection, FALSE, key->state);
        break;
    case GDK_space:
    case GDK_KP_Space:
        if (selection->mode != GTK_SELECTION_SINGLE) {
            int row = e_selection_model_cursor_row(selection);
            int col = e_selection_model_cursor_col(selection);
            e_selection_model_toggle_single_row (selection, row);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], row, col);
            return TRUE;
        }
        break;
    case GDK_Return:
    case GDK_KP_Enter:
        if (selection->mode != GTK_SELECTION_SINGLE) {
            int row = e_selection_model_cursor_row(selection);
            int col = e_selection_model_cursor_col(selection);
            e_selection_model_select_single_row (selection, row);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], row, col);
            return TRUE;
        }
        break;
    case GDK_Home:
    case GDK_KP_Home:
        if (selection->cursor_mode == E_CURSOR_LINE) {
            int row = 0;
            int cursor_col = e_selection_model_cursor_col(selection);

            row = e_sorter_sorted_to_model(selection->sorter, row);
            e_selection_model_change_cursor(selection, row, cursor_col);

            e_selection_model_select_single_row (selection, row);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_CHANGED], row, cursor_col);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], row, cursor_col);
            return TRUE;
        }
        break;
    case GDK_End:
    case GDK_KP_End:
        if (selection->cursor_mode == E_CURSOR_LINE) {
            int row = e_selection_model_row_count(selection) - 1;
            int cursor_col = e_selection_model_cursor_col(selection);

            row = e_sorter_sorted_to_model(selection->sorter, row);
            e_selection_model_change_cursor(selection, row, cursor_col);

            e_selection_model_select_single_row (selection, row);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_CHANGED], row, cursor_col);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], row, cursor_col);
            return TRUE;
        }
        break;
    }
    return FALSE;
}

void
e_selection_model_cursor_changed      (ESelectionModel *selection,
                       int              row,
                       int              col)
{
    gtk_signal_emit(GTK_OBJECT(selection),
            e_selection_model_signals[CURSOR_CHANGED], row, col);
}

void
e_selection_model_selection_changed   (ESelectionModel *selection)
{
    gtk_signal_emit(GTK_OBJECT(selection),
            e_selection_model_signals[SELECTION_CHANGED]);
}