path: root/e-util/e-table-header-utils.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/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *      Miguel de Icaza <miguel@ximian.com>
 *      Federico Mena-Quintero <federico@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include "e-table-header-utils.h"

#include <string.h> /* strlen() */

#include <gtk/gtk.h>

#include "e-table-defines.h"
#include "e-unicode.h"

static void
get_button_padding (GtkWidget *widget,
                    GtkBorder *padding)
{
    GtkStyleContext *context;
    GtkStateFlags state_flags;

    context = gtk_widget_get_style_context (widget);
    state_flags = gtk_widget_get_state_flags (widget);

    gtk_style_context_save (context);
    gtk_style_context_add_class (context, GTK_STYLE_CLASS_BUTTON);
    gtk_style_context_get_padding (context, state_flags, padding);

    gtk_style_context_restore (context);
}

/**
 * e_table_header_compute_height:
 * @ecol: Table column description.
 * @widget: The widget from which to build the PangoLayout.
 *
 * Computes the minimum height required for a table header button.
 *
 * Return value: The height of the button, in pixels.
 **/
gdouble
e_table_header_compute_height (ETableCol *ecol,
                               GtkWidget *widget)
{
    gint height;
    PangoLayout *layout;
    GtkBorder padding;

    g_return_val_if_fail (ecol != NULL, -1);
    g_return_val_if_fail (E_IS_TABLE_COL (ecol), -1);
    g_return_val_if_fail (GTK_IS_WIDGET (widget), -1);

    get_button_padding (widget, &padding);

    layout = gtk_widget_create_pango_layout (widget, ecol->text);

    pango_layout_get_pixel_size (layout, NULL, &height);

    if (ecol->icon_name != NULL) {
        g_return_val_if_fail (ecol->pixbuf != NULL, -1);
        height = MAX (height, gdk_pixbuf_get_height (ecol->pixbuf));
    }

    height = MAX (height, MIN_ARROW_SIZE);
    height += padding.top + padding.bottom + 2 * HEADER_PADDING;

    g_object_unref (layout);

    return height;
}

gdouble
e_table_header_width_extras (GtkWidget *widget)
{
    GtkBorder padding;

    get_button_padding (widget, &padding);
    return padding.left + padding.right + 2 * HEADER_PADDING;
}

/**
 * e_table_header_draw_button:
 * @cr: a cairo context
 * @ecol: Table column for the header information.
 * @widget: The table widget.
 * @x: Leftmost coordinate of the button.
 * @y: Topmost coordinate of the button.
 * @width: Width of the region to draw.
 * @height: Height of the region to draw.
 * @button_width: Width for the complete button.
 * @button_height: Height for the complete button.
 * @arrow: Arrow type to use as a sort indicator.
 *
 * Draws a button suitable for a table header.
 **/
void
e_table_header_draw_button (cairo_t *cr,
                            ETableCol *ecol,
                            GtkWidget *widget,
                            gint x,
                            gint y,
                            gint width,
                            gint height,
                            gint button_width,
                            gint button_height,
                            ETableColArrow arrow)
{
    gint inner_x, inner_y;
    gint inner_width, inner_height;
    gint arrow_width = 0, arrow_height = 0;
    PangoContext *pango_context;
    PangoLayout *layout;
    GtkStyleContext *context;
    GtkBorder padding;
    GtkStateFlags state_flags;

    g_return_if_fail (cr != NULL);
    g_return_if_fail (ecol != NULL);
    g_return_if_fail (E_IS_TABLE_COL (ecol));
    g_return_if_fail (widget != NULL);
    g_return_if_fail (GTK_IS_WIDGET (widget));
    g_return_if_fail (button_width > 0 && button_height > 0);

    /* Button bevel */
    context = gtk_widget_get_style_context (widget);
    state_flags = gtk_widget_get_state_flags (widget);

    gtk_style_context_save (context);
    gtk_style_context_set_state (context, state_flags);
    gtk_style_context_add_class (context, GTK_STYLE_CLASS_BUTTON);

    gtk_style_context_get_padding (context, state_flags, &padding);

    gtk_render_background (
        context, cr, x, y,
        button_width, button_height);
    gtk_render_frame (
        context, cr, x, y,
        button_width, button_height);

    /* Inside area */

    inner_width =
        button_width -
        (padding.left + padding.right + 2 * HEADER_PADDING);
    inner_height =
        button_height -
        (padding.top + padding.bottom + 2 * HEADER_PADDING);

    if (inner_width < 1 || inner_height < 1) {
        return; /* nothing fits */
    }

    inner_x = x + padding.left + HEADER_PADDING;
    inner_y = y + padding.top + HEADER_PADDING;

    /* Arrow space */

    switch (arrow) {
    case E_TABLE_COL_ARROW_NONE:
        break;

    case E_TABLE_COL_ARROW_UP:
    case E_TABLE_COL_ARROW_DOWN:
        arrow_width = MIN (MIN_ARROW_SIZE, inner_width);
        arrow_height = MIN (MIN_ARROW_SIZE, inner_height);

        if (ecol->icon_name == NULL)
            inner_width -= arrow_width + HEADER_PADDING;
        break;
    default:
        cairo_restore (cr);
        g_return_if_reached ();
    }

    if (inner_width < 1) {
        gtk_style_context_restore (context);
        return; /* nothing else fits */
    }

    pango_context = gtk_widget_create_pango_context (widget);
    layout = pango_layout_new (pango_context);
    g_object_unref (pango_context);

    pango_layout_set_text (layout, ecol->text, -1);
    pango_layout_set_ellipsize (layout, PANGO_ELLIPSIZE_END);

    /* Pixbuf or label */
    if (ecol->icon_name != NULL) {
        gint pwidth, pheight;
        gint clip_height;
        gint xpos;

        g_return_if_fail (ecol->pixbuf != NULL);

        pwidth = gdk_pixbuf_get_width (ecol->pixbuf);
        pheight = gdk_pixbuf_get_height (ecol->pixbuf);

        clip_height = MIN (pheight, inner_height);

        xpos = inner_x;

        if (inner_width - pwidth > 11) {
            gint ypos;

            pango_layout_get_pixel_size (layout, &width, NULL);

            if (width < inner_width - (pwidth + 1)) {
                xpos = inner_x + (inner_width - width - (pwidth + 1)) / 2;
            }

            ypos = inner_y;

            pango_layout_set_width (
                layout, (inner_width - (xpos - inner_x)) *
                PANGO_SCALE);

            gtk_render_layout (
                context, cr, xpos + pwidth + 1,
                ypos, layout);
        }

        gtk_render_icon (
            context, cr, ecol->pixbuf, xpos,
            inner_y + (inner_height - clip_height) / 2);

    } else {
        pango_layout_set_width (layout, inner_width * PANGO_SCALE);

        gtk_render_layout (context, cr, inner_x, inner_y, layout);
    }

    switch (arrow) {
    case E_TABLE_COL_ARROW_NONE:
        break;

    case E_TABLE_COL_ARROW_UP:
    case E_TABLE_COL_ARROW_DOWN: {
        if (ecol->icon_name == NULL)
            inner_width += arrow_width + HEADER_PADDING;

        gtk_render_arrow (
            context, cr,
            (arrow == E_TABLE_COL_ARROW_UP) ? 0 : G_PI,
            inner_x + inner_width - arrow_width,
            inner_y + (inner_height - arrow_height) / 2,
            MAX (arrow_width, arrow_height));

        break;
    }

    default:
        cairo_restore (cr);
        g_return_if_reached ();
    }

    g_object_unref (layout);
    gtk_style_context_restore (context);
}