path: root/widgets/e-table/e-table-field-chooser-item.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * E-table-column-view.c: A canvas item based view of the ETableColumn.
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org)
 *
 * Copyright 1999, 2000 Helix Code, Inc.
 */
#include <config.h>
#include <gtk/gtksignal.h>
#include <gtk/gtkdnd.h>
#include <libgnomeui/gnome-canvas.h>
#include <libgnomeui/gnome-canvas-util.h>
#include <libgnomeui/gnome-canvas-polygon.h>
#include <libgnomeui/gnome-canvas-rect-ellipse.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

#include "e-util/e-xml-utils.h"
#include "e-util/e-canvas.h"

#include "e-table-header.h"
#include "e-table-col-dnd.h"
#include "e-table-defines.h"

#include "e-table-field-chooser-item.h"

#if 0
enum {
    BUTTON_PRESSED,
    LAST_SIGNAL
};

static guint etfci_signals [LAST_SIGNAL] = { 0, };
#endif

#define PARENT_OBJECT_TYPE gnome_canvas_item_get_type ()

#define ELEMENTS(x) (sizeof (x) / sizeof (x[0]))

static GnomeCanvasItemClass *etfci_parent_class;

static void etfci_drop_table_header (ETableFieldChooserItem *etfci);

enum {
    ARG_0,
    ARG_FULL_HEADER,
    ARG_DND_CODE,
    ARG_WIDTH,
    ARG_HEIGHT,
};

static void
etfci_destroy (GtkObject *object){
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (object);

    etfci_drop_table_header (etfci);
    
    gdk_font_unref(etfci->font);

    if (GTK_OBJECT_CLASS (etfci_parent_class)->destroy)
        (*GTK_OBJECT_CLASS (etfci_parent_class)->destroy) (object);
}

static void
etfci_reflow (GnomeCanvasItem *item, gint flags)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    double old_height;

    old_height = etfci->height;

    etfci->height = e_table_header_count (etfci->full_header) * etfci->button_height;
    
    if (old_height != etfci->height)
        e_canvas_item_request_parent_reflow(item);
    
    gnome_canvas_item_request_update(item);
}

static void
etfci_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    double   i2c [6];
    ArtPoint c1, c2, i1, i2;
    
    if (GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->update)
        (*GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->update)(item, affine, clip_path, flags);

    i1.x = i1.y = 0;
    i2.x = etfci->width;
    i2.y = etfci->height;

    gnome_canvas_item_i2c_affine (item, i2c);
    art_affine_point (&c1, &i1, i2c);
    art_affine_point (&c2, &i2, i2c);

    if (item->x1 != c1.x ||
         item->y1 != c1.y ||
         item->x2 != c2.x ||
         item->y2 != c2.y)
        {
            gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
            item->x1 = c1.x;
            item->y1 = c1.y;
            item->x2 = c2.x;
            item->y2 = c2.y;

            gnome_canvas_group_child_bounds (GNOME_CANVAS_GROUP (item->parent), item);
        }
    gnome_canvas_request_redraw (item->canvas, item->x1, item->y1, item->x2, item->y2);
}

static void
etfci_font_load (ETableFieldChooserItem *etfci, char *font)
{
    if (etfci->font)
        gdk_font_unref (etfci->font);
    etfci->font = NULL;
    
    if (font)
        etfci->font = gdk_fontset_load (font);

    if (etfci->font == NULL) {
        etfci->font = GTK_WIDGET(GNOME_CANVAS_ITEM(etfci)->canvas)->style->font;
        gdk_font_ref(etfci->font);
    }
    
    etfci->button_height = etfci->font->ascent + etfci->font->descent + HEADER_PADDING;
}

static void
etfci_drop_table_header (ETableFieldChooserItem *etfci)
{
    GtkObject *header;
    
    if (!etfci->full_header)
        return;

    header = GTK_OBJECT (etfci->full_header);
    if (etfci->structure_change_id)
        gtk_signal_disconnect (header, etfci->structure_change_id);
    if (etfci->dimension_change_id)
        gtk_signal_disconnect (header, etfci->dimension_change_id);
    etfci->structure_change_id = 0;
    etfci->dimension_change_id = 0;

    if (header)
        gtk_object_unref (header);
    etfci->full_header = NULL;
    etfci->height = 0;
}

static void 
structure_changed (ETableHeader *header, ETableFieldChooserItem *etfci)
{
    e_canvas_item_request_reflow(GNOME_CANVAS_ITEM(etfci));
}

static void
dimension_changed (ETableHeader *header, int col, ETableFieldChooserItem *etfci)
{
    e_canvas_item_request_reflow(GNOME_CANVAS_ITEM(etfci));
}

static void
etfci_add_table_header (ETableFieldChooserItem *etfci, ETableHeader *header)
{
    etfci->full_header = header;
    gtk_object_ref (GTK_OBJECT (etfci->full_header));

    etfci->structure_change_id = gtk_signal_connect (
        GTK_OBJECT (header), "structure_change",
        GTK_SIGNAL_FUNC(structure_changed), etfci);
    etfci->dimension_change_id = gtk_signal_connect (
        GTK_OBJECT (header), "dimension_change",
        GTK_SIGNAL_FUNC(dimension_changed), etfci);
    e_canvas_item_request_reflow(GNOME_CANVAS_ITEM(etfci));
}

static void
etfci_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    GnomeCanvasItem *item;
    ETableFieldChooserItem *etfci;

    item = GNOME_CANVAS_ITEM (o);
    etfci = E_TABLE_FIELD_CHOOSER_ITEM (o);

    switch (arg_id){
    case ARG_FULL_HEADER:
        etfci_drop_table_header (etfci);
        if (GTK_VALUE_OBJECT (*arg))
            etfci_add_table_header (etfci, E_TABLE_HEADER(GTK_VALUE_OBJECT (*arg)));
        break;

    case ARG_DND_CODE:
        g_free(etfci->dnd_code);
        etfci->dnd_code = g_strdup(GTK_VALUE_STRING (*arg));
        break;

    case ARG_WIDTH:
        etfci->width = GTK_VALUE_DOUBLE (*arg);
        gnome_canvas_item_request_update(item);
        break;
    }
}

static void
etfci_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    GnomeCanvasItem *item;
    ETableFieldChooserItem *etfci;

    item = GNOME_CANVAS_ITEM (o);
    etfci = E_TABLE_FIELD_CHOOSER_ITEM (o);

    switch (arg_id){

    case ARG_DND_CODE:
        GTK_VALUE_STRING (*arg) = g_strdup (etfci->dnd_code);
        break;
    case ARG_WIDTH:
        GTK_VALUE_DOUBLE (*arg) = etfci->width;
        break;
    case ARG_HEIGHT:
        GTK_VALUE_DOUBLE (*arg) = etfci->height;
        break;
    default:
        arg->type = GTK_TYPE_INVALID;
        break;
    }
}

static void
etfci_drag_data_get (GtkWidget          *widget,
             GdkDragContext     *context,
             GtkSelectionData   *selection_data,
             guint               info,
             guint               time,
             ETableFieldChooserItem *etfci)
{
    if (etfci->drag_col != -1) {
        gchar *string = g_strdup_printf("%d", etfci->drag_col);
        gtk_selection_data_set(selection_data,
                       GDK_SELECTION_TYPE_STRING,
                       sizeof(string[0]),
                       string,
                       strlen(string));
        g_free(string);
    }
}

static void
etfci_drag_end (GtkWidget      *canvas, 
        GdkDragContext *context,
        ETableFieldChooserItem *etfci)
{
    etfci->drag_col = -1;
}

static void
etfci_realize (GnomeCanvasItem *item)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    GdkWindow *window;

    if (GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)-> realize)
        (*GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->realize)(item);

    window = GTK_WIDGET (item->canvas)->window;

    if (!etfci->font)
        etfci_font_load (etfci, NULL);

    etfci->drag_end_id = gtk_signal_connect (
        GTK_OBJECT (item->canvas), "drag_end",
        GTK_SIGNAL_FUNC (etfci_drag_end), etfci);
    etfci->drag_data_get_id = gtk_signal_connect (
        GTK_OBJECT (item->canvas), "drag_data_get",
        GTK_SIGNAL_FUNC (etfci_drag_data_get), etfci);
}

static void
etfci_unrealize (GnomeCanvasItem *item)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);

    if (etfci->font)
        gdk_font_unref (etfci->font);
    etfci->font = NULL;

    gtk_signal_disconnect (GTK_OBJECT (item->canvas), etfci->drag_end_id);
    etfci->drag_end_id = 0;
    gtk_signal_disconnect (GTK_OBJECT (item->canvas), etfci->drag_data_get_id);
    etfci->drag_data_get_id = 0;
    
    if (GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->unrealize)
        (*GNOME_CANVAS_ITEM_CLASS (etfci_parent_class)->unrealize)(item);
}

static void
draw_button (ETableFieldChooserItem *etfci, ETableCol *col,
         GdkDrawable *drawable, GtkStyle *style,
         int x, int y, int width, int height)
{
    GdkRectangle clip;
    int xtra;
    GdkRectangle area;

    GtkWidget *widget = GTK_WIDGET(GNOME_CANVAS_ITEM(etfci)->canvas);
    
    gdk_window_clear_area (drawable, x, y, width, height);

    area.x = x;
    area.y = y;
    area.width = width;
    area.height = height;

    gtk_paint_box (style, drawable,
               GTK_STATE_NORMAL, GTK_SHADOW_OUT,
               &area, widget, "button",
               x, y, width, height);

    clip.x = x + HEADER_PADDING / 2;
    clip.y = y + HEADER_PADDING / 2;
    clip.width = width - HEADER_PADDING;
    clip.height = etfci->button_height;
    
    if (col->is_pixbuf){
        xtra = (clip.width - gdk_pixbuf_get_width (col->pixbuf))/2;
        
        xtra += HEADER_PADDING / 2;

        gdk_pixbuf_render_to_drawable_alpha (col->pixbuf, 
                             drawable,
                             0, 0, 
                             x + xtra, y + (clip.height - gdk_pixbuf_get_height (col->pixbuf)) / 2,
                             gdk_pixbuf_get_width (col->pixbuf), gdk_pixbuf_get_height(col->pixbuf),
                             GDK_PIXBUF_ALPHA_FULL, 128,
                             GDK_RGB_DITHER_NORMAL,
                             0, 0);
    } else {
        /* Center the thing */
        xtra = (clip.width - gdk_string_measure (etfci->font, col->text))/2;
        
        /* Skip over border */
        if (xtra < 0)
            xtra = 0;

        xtra += HEADER_PADDING / 2;
    
        gdk_draw_text (
                   drawable, etfci->font,
                   style->text_gc[GTK_STATE_NORMAL], x + xtra, y + etfci->button_height - etfci->font->descent - HEADER_PADDING / 2,
                   col->text, strlen (col->text));
    }
}

static void
etfci_draw (GnomeCanvasItem *item, GdkDrawable *drawable, int x, int y, int width, int height)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    GnomeCanvas *canvas = item->canvas;
    const int rows = e_table_header_count (etfci->full_header);
    int y1, y2;
    int row;

    y1 = y2 = 0;
    for (row = 0; row < rows; row++, y1 = y2){
        ETableCol *ecol = e_table_header_get_column (etfci->full_header, row);

        y2 += etfci->button_height;
        
        if (y1 > (y + height))
            break;

        if (y2 < y)
            continue;
        
        draw_button (etfci, ecol, drawable,
                 GTK_WIDGET (canvas)->style,
                 - x, y1 - y, etfci->width, y2 - y1);
    }
}

static double
etfci_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
        GnomeCanvasItem **actual_item)
{
    *actual_item = item;
    return 0.0;
}

static gboolean
etfci_maybe_start_drag (ETableFieldChooserItem *etfci, double x, double y)
{
    if (!etfci->maybe_drag)
        return FALSE;

    if (MAX (abs (etfci->click_x - x),
         abs (etfci->click_y - y)) <= 3)
        return FALSE;

    return TRUE;
}

static void
etfci_start_drag (ETableFieldChooserItem *etfci, GdkEvent *event)
{
    GtkWidget *widget = GTK_WIDGET (GNOME_CANVAS_ITEM (etfci)->canvas);
    GtkTargetList *list;
    GdkDragContext *context;
    ETableCol *ecol;
    GdkPixmap *pixmap;
    int drag_col;

    GtkTargetEntry  etfci_drag_types [] = {
        { TARGET_ETABLE_COL_TYPE, 0, TARGET_ETABLE_COL_HEADER },
    };

    drag_col = event->motion.x / etfci->button_height;

    if (drag_col < 0 || drag_col > e_table_header_count(etfci->full_header))
        return;

    ecol = e_table_header_get_column (etfci->full_header, drag_col);

    etfci->drag_col = ecol->col_idx;

    etfci_drag_types[0].target = g_strdup_printf("%s-%s", etfci_drag_types[0].target, etfci->dnd_code);
    list = gtk_target_list_new (etfci_drag_types, ELEMENTS (etfci_drag_types));
    context = gtk_drag_begin (widget, list, GDK_ACTION_MOVE, 1, event);
    g_free(etfci_drag_types[0].target);


    pixmap = gdk_pixmap_new (widget->window, etfci->width, etfci->button_height, -1);
    draw_button (etfci, ecol, pixmap,
             widget->style,
             0, 0, etfci->width, etfci->button_height);
    gtk_drag_set_icon_pixmap        (context,
                     gdk_window_get_colormap (widget->window),
                     pixmap,
                     NULL,
                     etfci->width / 2,
                     etfci->button_height / 2);
    gdk_pixmap_unref (pixmap);
    etfci->maybe_drag = FALSE;
}

/*
 * Handles the events on the ETableFieldChooserItem
 */
static int
etfci_event (GnomeCanvasItem *item, GdkEvent *e)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);
    GnomeCanvas *canvas = item->canvas;
    int x, y;
    
    switch (e->type){
    case GDK_MOTION_NOTIFY:
        gnome_canvas_w2c (canvas, e->motion.x, e->motion.y, &x, &y);

        if (etfci_maybe_start_drag (etfci, x, y))
            etfci_start_drag (etfci, e);
        break;
        
    case GDK_BUTTON_PRESS:
        gnome_canvas_w2c (canvas, e->button.x, e->button.y, &x, &y);
        
        if (e->button.button == 1){
            etfci->click_x = x;
            etfci->click_y = y;
            etfci->maybe_drag = TRUE;
        }
        break;
        
    case GDK_BUTTON_RELEASE: {
        etfci->maybe_drag = FALSE;
        break;
    }
    
    default:
        return FALSE;
    }
    return TRUE;
}

static void
etfci_class_init (GtkObjectClass *object_class)
{
    GnomeCanvasItemClass *item_class = (GnomeCanvasItemClass *) object_class;

    etfci_parent_class = gtk_type_class (PARENT_OBJECT_TYPE);
    
    object_class->destroy = etfci_destroy;
    object_class->set_arg = etfci_set_arg;
    object_class->get_arg = etfci_get_arg;

    item_class->update      = etfci_update;
    item_class->realize     = etfci_realize;
    item_class->unrealize   = etfci_unrealize;
    item_class->draw        = etfci_draw;
    item_class->point       = etfci_point;
    item_class->event       = etfci_event;
    
    gtk_object_add_arg_type ("ETableFieldChooserItem::dnd_code", GTK_TYPE_STRING,
                 GTK_ARG_READWRITE, ARG_DND_CODE);
    gtk_object_add_arg_type ("ETableFieldChooserItem::full_header", GTK_TYPE_OBJECT,
                 GTK_ARG_WRITABLE, ARG_FULL_HEADER);
    gtk_object_add_arg_type ("ETableFieldChooserItem::width", GTK_TYPE_DOUBLE,
                 GTK_ARG_READWRITE, ARG_WIDTH);
    gtk_object_add_arg_type ("ETableFieldChooserItem::height", GTK_TYPE_DOUBLE,
                 GTK_ARG_READABLE, ARG_HEIGHT);
}

static void
etfci_init (GnomeCanvasItem *item)
{
    ETableFieldChooserItem *etfci = E_TABLE_FIELD_CHOOSER_ITEM (item);

    etfci->full_header = NULL;
    
    etfci->height = etfci->width = 0;
    etfci->button_height = 0;

    etfci->font = NULL;

    etfci->structure_change_id = 0;
    etfci->dimension_change_id = 0;

    etfci->dnd_code = NULL;

    etfci->maybe_drag = 0;
    etfci->drag_end_id = 0;

    e_canvas_item_set_reflow_callback(item, etfci_reflow);
}

GtkType
e_table_field_chooser_item_get_type (void)
{
    static GtkType type = 0;

    if (!type){
        GtkTypeInfo info = {
            "ETableFieldChooserItem",
            sizeof (ETableFieldChooserItem),
            sizeof (ETableFieldChooserItemClass),
            (GtkClassInitFunc) etfci_class_init,
            (GtkObjectInitFunc) etfci_init,
            NULL, /* reserved 1 */
            NULL, /* reserved 2 */
            (GtkClassInitFunc) NULL
        };

        type = gtk_type_unique (PARENT_OBJECT_TYPE, &info);
    }

    return type;
}