/* ETable widget - utilities for drawing table header buttons
*
* Copyright (C) 2000 Helix Code, Inc.
*
* Authors: Chris Lahey <clahey@helixcode.com>
* Miguel de Icaza <miguel@helixcode.com>
* Federico Mena-Quintero <federico@helixcode.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glib.h>
#include "e-table-defines.h"
#include "e-table-header-utils.h"
/**
* e_table_header_compute_height:
* @ecol: Table column description.
* @style: Style for the button's bevel.
* @font: Font for the button's text, or NULL if no font is available.
*
* Computes the minimum height required for a table header button.
*
* Return value: The height of the button, in pixels.
**/
int
e_table_header_compute_height (ETableCol *ecol, GtkStyle *style, GdkFont *font)
{
int ythick;
int height;
g_return_val_if_fail (ecol != NULL, -1);
g_return_val_if_fail (E_IS_TABLE_COL (ecol), -1);
g_return_val_if_fail (style != NULL, -1);
ythick = style->klass->ythickness;
if (font)
height = font->ascent + font->descent;
else
height = 16; /* FIXME: default? */
if (ecol->is_pixbuf) {
g_assert (ecol->pixbuf != NULL);
height = MAX (height, gdk_pixbuf_get_height (ecol->pixbuf));
}
height = MAX (height, MIN_ARROW_SIZE);
height += 2 * (ythick + HEADER_PADDING);
return height;
}
/* Creates a pixmap that is a composite of a background color and the upper-left
* corner rectangle of a pixbuf.
*/
static GdkPixmap *
make_composite_pixmap (GdkDrawable *drawable, GdkGC *gc,
GdkPixbuf *pixbuf, GdkColor *bg, int width, int height,
int dither_xofs, int dither_yofs)
{
int pwidth, pheight;
GdkPixmap *pixmap;
GdkPixbuf *tmp;
int color;
pwidth = gdk_pixbuf_get_width (pixbuf);
pheight = gdk_pixbuf_get_height (pixbuf);
g_assert (width <= pwidth && height <= pheight);
color = ((bg->red & 0xff00) << 8) | (bg->green & 0xff00) | ((bg->blue & 0xff00) >> 8);
if (width >= pwidth && height >= pheight) {
tmp = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
if (!tmp)
return NULL;
gdk_pixbuf_composite_color (pixbuf, tmp,
0, 0,
width, height,
0, 0,
1.0, 1.0,
GDK_INTERP_NEAREST,
255,
0, 0,
16,
color, color);
} else {
int x, y, rowstride;
GdkPixbuf *fade;
guchar *pixels;
/* Do a nice fade of the pixbuf down and to the right */
fade = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
if (!fade)
return NULL;
gdk_pixbuf_copy_area (pixbuf,
0, 0,
width, height,
fade,
0, 0);
rowstride = gdk_pixbuf_get_rowstride (fade);
pixels = gdk_pixbuf_get_pixels (fade);
for (y = 0; y < height; y++) {
guchar *p;
int yfactor;
p = pixels + y * rowstride;
if (height < pheight)
yfactor = height - y;
else
yfactor = height;
for (x = 0; x < width; x++) {
int xfactor;
if (width < pwidth)
xfactor = width - x;
else
xfactor = width;
p[3] = ((int) p[3] * xfactor * yfactor / (width * height));
p += 4;
}
}
tmp = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
if (!tmp) {
gdk_pixbuf_unref (fade);
return NULL;
}
gdk_pixbuf_composite_color (fade, tmp,
0, 0,
width, height,
0, 0,
1.0, 1.0,
GDK_INTERP_NEAREST,
255,
0, 0,
16,
color, color);
gdk_pixbuf_unref (fade);
}
pixmap = gdk_pixmap_new (drawable, width, height, gdk_rgb_get_visual ()->depth);
gdk_draw_rgb_image_dithalign (pixmap, gc,
0, 0,
width, height,
GDK_RGB_DITHER_NORMAL,
gdk_pixbuf_get_pixels (tmp),
gdk_pixbuf_get_rowstride (tmp),
dither_xofs, dither_yofs);
gdk_pixbuf_unref (tmp);
return pixmap;
}
/**
* e_table_header_draw_button:
* @drawable: Destination drawable.
* @ecol: Table column for the header information.
* @style: Style to use for drawing the button.
* @font: Font for the button's text.
* @state: State of the table widget.
* @widget: The table widget.
* @gc: GC to use for drawing.
* @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 (GdkDrawable *drawable, ETableCol *ecol,
GtkStyle *style, GdkFont *font, GtkStateType state,
GtkWidget *widget, GdkGC *gc,
int x, int y, int width, int height,
int button_width, int button_height,
ETableColArrow arrow)
{
int xthick, ythick;
int inner_x, inner_y;
int inner_width, inner_height;
g_return_if_fail (drawable != NULL);
g_return_if_fail (ecol != NULL);
g_return_if_fail (E_IS_TABLE_COL (ecol));
g_return_if_fail (style != NULL);
g_return_if_fail (font != NULL);
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (button_width > 0 && button_height > 0);
xthick = style->klass->xthickness;
ythick = style->klass->ythickness;
/* Button bevel */
gtk_paint_box (style, drawable, state, GTK_SHADOW_OUT,
NULL, widget, "button",
x, y, button_width, button_height);
/* Inside area */
inner_width = button_width - 2 * (xthick + HEADER_PADDING);
inner_height = button_height - 2 * (ythick + HEADER_PADDING);
if (inner_width < 1 || inner_height < 1)
return; /* nothing fits */
inner_x = x + xthick + HEADER_PADDING;
inner_y = y + ythick + HEADER_PADDING;
/* Arrow */
switch (arrow) {
case E_TABLE_COL_ARROW_NONE:
break;
case E_TABLE_COL_ARROW_UP:
case E_TABLE_COL_ARROW_DOWN: {
int arrow_width, arrow_height;
arrow_width = MIN (MIN_ARROW_SIZE, inner_width);
arrow_height = MIN (MIN_ARROW_SIZE, inner_height);
gtk_paint_arrow (style, drawable, state,
GTK_SHADOW_IN, NULL, widget, "header",
(arrow == E_TABLE_COL_ARROW_UP) ? GTK_ARROW_UP : GTK_ARROW_DOWN,
TRUE,
inner_x + inner_width - arrow_width,
inner_y + (inner_height - arrow_height) / 2,
arrow_width, arrow_height);
inner_width -= arrow_width + HEADER_PADDING;
break;
}
default:
g_assert_not_reached ();
return;
}
if (inner_width < 1)
return; /* nothing else fits */
/* Pixbuf or label */
if (ecol->is_pixbuf) {
int pwidth, pheight;
int clip_width, clip_height;
GdkPixmap *pixmap;
g_assert (ecol->pixbuf != NULL);
pwidth = gdk_pixbuf_get_width (ecol->pixbuf);
pheight = gdk_pixbuf_get_height (ecol->pixbuf);
clip_width = MIN (pwidth, inner_width);
clip_height = MIN (pheight, inner_height);
pixmap = make_composite_pixmap (drawable, gc,
ecol->pixbuf, &style->bg[state],
clip_width, clip_height,
inner_x,
inner_y + (inner_height - clip_height) / 2);
if (pixmap) {
gdk_draw_pixmap (drawable, gc, pixmap,
0, 0,
inner_x,
inner_y + (inner_height - clip_height) / 2,
clip_width, clip_height);
gdk_pixmap_unref (pixmap);
}
} else {
int ypos;
ypos = inner_y + (inner_height - font->ascent - font->descent) / 2 + font->ascent;
e_table_draw_elided_string (drawable, font, gc,
inner_x, ypos,
ecol->text, inner_width, TRUE);
}
}
/* Computes the length of a string that needs to be trimmed for elision */
static int
compute_elision_length (GdkFont *font, const char *str, int max_width)
{
int len;
int l = 0, left, right;
int rbearing;
len = strlen (str);
if (len <= 0)
return 0;
left = 0;
right = len;
while (left < right) {
l = (left + right) / 2;
gdk_text_extents (font, str, l, NULL, &rbearing, NULL, NULL, NULL);
if (rbearing < max_width)
left = l + 1;
else if (rbearing > max_width)
right = l;
else
return l;
}
if (rbearing > max_width)
return MAX (0, l - 1);
else
return l;
}
/* Default width of the elision arrow in pixels */
#define ARROW_WIDTH 4
/**
* e_table_draw_elided_string:
* @drawable: Destination drawable.
* @font: Font for the text.
* @gc: GC to use for drawing.
* @x: X insertion point for the string.
* @y: Y insertion point for the string's baseline.
* @str: String to draw.
* @max_width: Maximum width in which the string must fit.
* @center: Whether to center the string in the available area if it does fit.
*
* Draws a string, possibly trimming it so that it fits inside the specified
* maximum width. If it does not fit, an elision indicator is drawn after the
* last character that does fit.
**/
void
e_table_draw_elided_string (GdkDrawable *drawable, GdkFont *font, GdkGC *gc,
int x, int y, const char *str, int max_width, gboolean center)
{
int rbearing;
int width;
g_return_if_fail (drawable != NULL);
g_return_if_fail (font != NULL);
g_return_if_fail (gc != NULL);
g_return_if_fail (str != NULL);
g_return_if_fail (max_width >= 0);
gdk_string_extents (font, str, NULL, &rbearing, &width, NULL, NULL);
if (rbearing <= max_width) {
int xpos;
if (center)
xpos = x + (max_width - width) / 2;
else
xpos = x;
gdk_draw_string (drawable, font, gc, xpos, y, str);
} else {
int arrow_width;
int len;
int i;
if (max_width < ARROW_WIDTH + 1)
arrow_width = max_width - 1;
else
arrow_width = ARROW_WIDTH;
len = compute_elision_length (font, str, max_width - arrow_width - 1);
gdk_draw_text (drawable, font, gc, x, y, str, len);
gdk_text_extents (font, str, len, NULL, &rbearing, NULL, NULL, NULL);
y -= font->ascent;
for (i = 0; i < arrow_width; i++) {
int h;
h = 2 * i + 1;
gdk_draw_line (drawable, gc,
x + rbearing + arrow_width - i,
y + (font->ascent + font->descent - h) / 2,
x + rbearing + arrow_width - i,
y + (font->ascent + font->descent - h) / 2 + h - 1);
}
}
}
