path: root/widgets/table/e-cell-tree.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* e-cell-tree.c - Tree cell renderer
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * Author: Chris Toshok <toshok@helixcode.com>
 *
 * A majority of code taken from:
 *
 * the ECellText renderer.
 *
 * Copyright (C) 1998 The Free Software Foundation
 *
 */

#include <config.h>
#include <gtk/gtkenums.h>
#include <gtk/gtkentry.h>
#include <gtk/gtkwindow.h>
#include <gtk/gtkinvisible.h>
#include <gtk/gtksignal.h>
#include <gdk/gdkkeysyms.h>
#include <libgnomeui/gnome-canvas.h>
#include <stdio.h>
#include "e-table-sorted-variable.h"
#include "e-tree-model.h"
#include "e-cell-tree.h"
#include "e-util/e-util.h"
#include "e-table-item.h"

#include <gdk/gdkx.h> /* for BlackPixel */
#include <ctype.h>
#include <math.h>

#include "tree-expanded.xpm"
#include "tree-unexpanded.xpm"

#define PARENT_TYPE e_cell_get_type ()

typedef struct {
    ECellView    cell_view;
    ECellView   *subcell_view;
    GdkGC       *gc;

    GnomeCanvas *canvas;

} ECellTreeView;

static ECellClass *parent_class;

static GdkPixbuf   *tree_expanded_pixbuf, *tree_unexpanded_pixbuf;

#define INDENT_AMOUNT 16

static int
visible_depth_of_node (ETreeModel *tree_model, ETreePath *path)
{
    return (e_tree_model_node_depth (tree_model, path) 
        - (e_tree_model_root_node_is_visible (tree_model) ? 0 : 1));
}

static gint
offset_of_node (ETreeModel *tree_model, ETreePath *path)
{
    return (visible_depth_of_node(tree_model, path) + 1) * INDENT_AMOUNT;
}

static ETreePath*
e_cell_tree_get_node (ETreeModel *tree_model, int row)
{
    return (ETreePath*)e_table_model_value_at (E_TABLE_MODEL(tree_model), -1, row);
}

static ETreeModel*
e_cell_tree_get_tree_model (ETableModel *table_model, int row)
{
    return (ETreeModel*)e_table_model_value_at (table_model, -2, row);
}

/*
 * ECell::new_view method
 */
static ECellView *
ect_new_view (ECell *ecell, ETableModel *table_model, void *e_table_item_view)
{
    ECellTree *ect = E_CELL_TREE (ecell);
    ECellTreeView *tree_view = g_new0 (ECellTreeView, 1);
    GnomeCanvas *canvas = GNOME_CANVAS_ITEM (e_table_item_view)->canvas;
    
    tree_view->cell_view.ecell = ecell;
    tree_view->cell_view.e_table_model = table_model;
    tree_view->cell_view.e_table_item_view = e_table_item_view;
    
    /* create our subcell view */
    tree_view->subcell_view = e_cell_new_view (ect->subcell, table_model, e_table_item_view /* XXX */);

    tree_view->canvas = canvas;

    return (ECellView *)tree_view;
}

/*
 * ECell::kill_view method
 */
static void
ect_kill_view (ECellView *ecv)
{
    ECellTreeView *tree_view = (ECellTreeView *) ecv;

    /* kill our subcell view */
    e_cell_kill_view (tree_view->subcell_view);

    g_free (tree_view);
}

/*
 * ECell::realize method
 */
static void
ect_realize (ECellView *ecell_view)
{
    ECellTreeView *tree_view = (ECellTreeView *) ecell_view;

    /* realize our subcell view */
    e_cell_realize (tree_view->subcell_view);

    tree_view->gc = gdk_gc_new (GTK_WIDGET (tree_view->canvas)->window);

    gdk_gc_set_line_attributes (tree_view->gc, 1, 
                    GDK_LINE_ON_OFF_DASH, None, None);
    gdk_gc_set_dashes (tree_view->gc, 0, "\1\1", 2);

    if (parent_class->realize)
        (* parent_class->realize) (ecell_view);
}

/*
 * ECell::unrealize method
 */
static void
ect_unrealize (ECellView *ecv)
{
    ECellTreeView *tree_view = (ECellTreeView *) ecv;

    /* unrealize our subcell view. */
    e_cell_unrealize (tree_view->subcell_view);

    gdk_gc_unref (tree_view->gc);
    tree_view->gc = NULL;

    if (parent_class->unrealize)
        (* parent_class->unrealize) (ecv);
}

/*
 * ECell::draw method
 */
static void
ect_draw (ECellView *ecell_view, GdkDrawable *drawable,
      int model_col, int view_col, int row, gboolean selected,
      int x1, int y1, int x2, int y2)
{
    ECellTreeView *tree_view = (ECellTreeView *)ecell_view;
    ETreeModel *tree_model = e_cell_tree_get_tree_model(ecell_view->e_table_model, row);
    ETreePath *node;
    GdkRectangle rect, *clip_rect;
    GtkWidget *canvas = GTK_WIDGET (tree_view->canvas);
    GdkGC *fg_gc = canvas->style->fg_gc[GTK_STATE_ACTIVE];
    GdkColor *background, *foreground;

    int offset, subcell_offset;
    gboolean expanded, expandable;

    /* only draw the tree effects if we're the active sort */
    if (/* XXX */ TRUE) {
        /*
         * need to get the following things from the model
         * 1. depth of item.
         * 2. whether or not it has any children.
         * 3. whether the item is a toplevel item.
         * 3. ... anything else?
         */
        node = e_cell_tree_get_node (tree_model, row);

        offset = offset_of_node (tree_model, node);
        expandable = e_tree_model_node_is_expandable (tree_model, node);
        expanded = e_tree_model_node_is_expanded (tree_model, node);
        subcell_offset = offset;

        /*
         * Be a nice citizen: clip to the region we are supposed to draw on
         */
        rect.x = x1;
        rect.y = y1;
        rect.width = offset;
        rect.height = y2 - y1;
    
        gdk_gc_set_clip_rectangle (tree_view->gc, &rect);
        gdk_gc_set_clip_rectangle (fg_gc, &rect);
        clip_rect = &rect;

        if (selected){
            background = &canvas->style->bg [GTK_STATE_SELECTED];
            foreground = &canvas->style->text [GTK_STATE_SELECTED];
        } else {
            background = &canvas->style->base [GTK_STATE_NORMAL];
            foreground = &canvas->style->text [GTK_STATE_NORMAL];
        }
        gdk_gc_set_foreground (tree_view->gc, background);
        gdk_draw_rectangle (drawable, tree_view->gc, TRUE,
                    rect.x, rect.y, rect.width, rect.height);
        gdk_gc_set_foreground (tree_view->gc, foreground);

        /* draw our lines */
        if (E_CELL_TREE(tree_view->cell_view.ecell)->draw_lines) {

            gdk_draw_line (drawable, tree_view->gc,
                       rect.x + offset - INDENT_AMOUNT / 2 + 1,
                       rect.y + rect.height / 2,
                       rect.x + offset,
                       rect.y + rect.height / 2);

            if (visible_depth_of_node (tree_model, node) != 0) {
                gdk_draw_line (drawable, tree_view->gc,
                           rect.x + offset - INDENT_AMOUNT / 2,
                           rect.y,
                           rect.x + offset - INDENT_AMOUNT / 2,
                           (e_tree_model_node_get_next (tree_model, node)
                        ? rect.y + rect.height
                        : rect.y + rect.height / 2));
            }

            /* now traverse back up to the root of the tree, checking at
               each level if the node has siblings, and drawing the
               correct vertical pipe for it's configuration. */
            node = e_tree_model_node_get_parent (tree_model, node);
            offset -= INDENT_AMOUNT;
            while (node && visible_depth_of_node (tree_model, node) != 0) {
                if (e_tree_model_node_get_next(tree_model, node)) {
                    gdk_draw_line (drawable, tree_view->gc,
                               rect.x + offset - INDENT_AMOUNT / 2,
                               rect.y,
                               rect.x + offset - INDENT_AMOUNT / 2,
                               rect.y + rect.height);
                }
                node = e_tree_model_node_get_parent (tree_model, node);
                offset -= INDENT_AMOUNT;
            }
        }

        /* now draw our icon if we're expandable */
        if (expandable) {
            GdkPixbuf *image = expanded ? tree_expanded_pixbuf : tree_unexpanded_pixbuf;
            int width, height;

            width = gdk_pixbuf_get_width(image);
            height = gdk_pixbuf_get_height(image);

            gdk_pixbuf_render_to_drawable_alpha (image,
                                 drawable,
                                 0, 0,
                                 x1 + subcell_offset - INDENT_AMOUNT / 2 - width / 2,
                                 y1 + (y2 - y1) / 2 - height / 2,
                                 width, height,
                                 GDK_PIXBUF_ALPHA_BILEVEL,
                                 128,
                                 GDK_RGB_DITHER_NORMAL,
                                 width, 0);
        }
    }

    /* Now cause our subcell to draw its contents, shifted by
       subcell_offset pixels */
    e_cell_draw (tree_view->subcell_view, drawable,
             model_col, view_col, row, selected,
             x1 + subcell_offset, y1, x2, y2);
}

/*
 * ECell::event method
 */
static gint
ect_event (ECellView *ecell_view, GdkEvent *event, int model_col, int view_col, int row)
{
    ECellTreeView *tree_view = (ECellTreeView *) ecell_view;

    switch (event->type) {
    case GDK_BUTTON_PRESS: {
        /* if the event happened in our area of control (and
                   we care about it), handle it. */
        ETreeModel *tree_model = e_cell_tree_get_tree_model (ecell_view->e_table_model, row);
        ETreePath *node = e_cell_tree_get_node (tree_model, row);
        int offset = offset_of_node (tree_model, node);

        /* only activate the tree control if the click/release happens in the icon's area. */
        if (event->button.x > (offset - INDENT_AMOUNT) && event->button.x < offset) {
            if (e_tree_model_node_is_expandable (tree_model, node)) {
                e_tree_model_node_set_expanded (tree_model,
                                node,
                                !e_tree_model_node_is_expanded(tree_model, node));
            }
            return TRUE;
        }
        else if (event->button.x < (offset - INDENT_AMOUNT))
            return TRUE;
    }
    default:
        /* otherwise, pass it off to our subcell_view */
        e_cell_event(tree_view->subcell_view, event, model_col, view_col, row);
        return TRUE;
    }
}

/*
 * ECell::height method
 */
static int
ect_height (ECellView *ecell_view, int model_col, int view_col, int row) 
{
    ECellTreeView *tree_view = (ECellTreeView *) ecell_view;

    return e_cell_height (tree_view->subcell_view, model_col, view_col, row);
}

/*
 * ECellView::enter_edit method
 */
static void *
ect_enter_edit (ECellView *ecell_view, int model_col, int view_col, int row)
{
    /* just defer to our subcell's view */
    ECellTreeView *tree_view = (ECellTreeView *) ecell_view;

    return e_cell_enter_edit (tree_view->subcell_view, model_col, view_col, row);
}

/*
 * ECellView::leave_edit method
 */
static void
ect_leave_edit (ECellView *ecell_view, int model_col, int view_col, int row, void *edit_context)
{
    /* just defer to our subcell's view */
    ECellTreeView *tree_view = (ECellTreeView *) ecell_view;

    e_cell_leave_edit (tree_view->subcell_view, model_col, view_col, row, edit_context);
}

/*
 * GtkObject::destroy method
 */
static void
ect_destroy (GtkObject *object)
{
    ECellTree *ect = E_CELL_TREE (object);

    /* destroy our subcell */
    gtk_object_destroy (GTK_OBJECT (ect->subcell));

    GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static void
e_cell_tree_class_init (GtkObjectClass *object_class)
{
    ECellClass *ecc = (ECellClass *) object_class;

    object_class->destroy = ect_destroy;

    ecc->new_view   = ect_new_view;
    ecc->kill_view  = ect_kill_view;
    ecc->realize    = ect_realize;
    ecc->unrealize  = ect_unrealize;
    ecc->draw       = ect_draw;
    ecc->event      = ect_event;
    ecc->height     = ect_height;
    ecc->enter_edit = ect_enter_edit;
    ecc->leave_edit = ect_leave_edit;

    parent_class = gtk_type_class (PARENT_TYPE);

    /*
     * Create our pixbuf for expanding/unexpanding
     */
    tree_expanded_pixbuf = gdk_pixbuf_new_from_xpm_data(tree_expanded_xpm);
    tree_unexpanded_pixbuf = gdk_pixbuf_new_from_xpm_data(tree_unexpanded_xpm);
}

E_MAKE_TYPE(e_cell_tree, "ECellTree", ECellTree, e_cell_tree_class_init, NULL, PARENT_TYPE);

void
e_cell_tree_construct (ECellTree *ect,
               gboolean draw_lines,
               ECell *subcell)
{              
    ect->subcell = subcell;
    ect->draw_lines = draw_lines;
}


ECell *
e_cell_tree_new (ETableModel *etm,
         gboolean draw_lines,
         ECell *subcell)
{
    ECellTree *ect = gtk_type_new (e_cell_tree_get_type ());

    e_cell_tree_construct (ect, draw_lines, subcell);

    return (ECell *) ect;
}