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label: Redo get_preferred_width/height()

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This is important for size groups mostly, but also has some small fixes.
The label-sizing reftest as been updated accordingly.
This commit is contained in:
Benjamin Otte 2012-11-03 15:36:22 +01:00
parent f55fe7e20b
commit aba0c5cc3b
2 changed files with 56 additions and 78 deletions
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124
gtk/gtklabel.c
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@ -3439,23 +3439,6 @@ gtk_label_ensure_layout (GtkLabel *label)
}
}
static gint
get_single_line_height (GtkWidget *widget,
PangoLayout *layout)
{
PangoContext *context;
PangoFontMetrics *metrics;
gint ascent, descent;
context = pango_layout_get_context (layout);
metrics = get_font_metrics (context, widget);
ascent = pango_font_metrics_get_ascent (metrics);
descent = pango_font_metrics_get_descent (metrics);
pango_font_metrics_unref (metrics);
return ascent + descent;
}
static GtkSizeRequestMode
gtk_label_get_request_mode (GtkWidget *widget)
{
@ -3512,11 +3495,12 @@ get_char_pixels (GtkWidget *label,
static void
gtk_label_get_preferred_layout_size (GtkLabel *label,
PangoRectangle *required,
PangoRectangle *natural)
PangoRectangle *widest,
PangoRectangle *highest)
{
GtkLabelPrivate *priv = label->priv;
PangoLayout *layout;
gint char_pixels;
/* "width-chars" Hard-coded minimum width:
* - minimum size should be MAX (width-chars, strlen ("..."));
@ -3537,44 +3521,44 @@ gtk_label_get_preferred_layout_size (GtkLabel *label,
/* Start off with the pixel extents of an as-wide-as-possible layout */
layout = gtk_label_get_measuring_layout (label, NULL, -1);
pango_layout_get_extents (layout, NULL, natural);
natural->x = natural->y = 0;
if (priv->width_chars > -1 || priv->max_width_chars > -1)
char_pixels = get_char_pixels (GTK_WIDGET (label), layout);
else
char_pixels = 0;
if (priv->wrap)
natural->height = get_single_line_height (GTK_WIDGET (label), layout);
pango_layout_get_extents (layout, NULL, widest);
widest->width = MAX (widest->width, char_pixels * priv->width_chars);
widest->x = widest->y = 0;
if (priv->ellipsize || priv->wrap)
{
/* a layout with width 0 will be as small as humanly possible */
layout = gtk_label_get_measuring_layout (label, layout, 0);
layout = gtk_label_get_measuring_layout (label,
layout,
priv->width_chars > -1 ? char_pixels * priv->width_chars
: 0);
pango_layout_get_extents (layout, NULL, required);
pango_layout_get_extents (layout, NULL, highest);
highest->width = MAX (highest->width, char_pixels * priv->width_chars);
highest->x = highest->y = 0;
/* can happen when Pango decides to ellipsize text */
if (required->width > natural->width)
required->width = natural->width;
required->x = required->y = 0;
required->height = natural->height;
if (priv->max_width_chars > -1 && widest->width > char_pixels * priv->max_width_chars)
{
layout = gtk_label_get_measuring_layout (label,
layout,
MAX (highest->width, char_pixels * priv->max_width_chars));
pango_layout_get_extents (layout, NULL, widest);
widest->width = MAX (widest->width, char_pixels * priv->width_chars);
widest->x = widest->y = 0;
}
g_assert (widest->width >= highest->width);
}
else
{
*required = *natural;
*highest = *widest;
}
if (priv->width_chars > -1 || priv->max_width_chars > -1)
{
gint char_pixels;
char_pixels = get_char_pixels (GTK_WIDGET (label), layout);
if (priv->width_chars > -1)
required->width = MAX (required->width, char_pixels * priv->width_chars);
if (priv->max_width_chars > -1)
natural->width = MIN (natural->width, priv->max_width_chars * char_pixels);
natural->width = MAX (natural->width, required->width);
}
g_assert (widest->height <= highest->height);
g_object_unref (layout);
}
@ -3587,36 +3571,28 @@ gtk_label_get_preferred_size (GtkWidget *widget,
{
GtkLabel *label = GTK_LABEL (widget);
GtkLabelPrivate *priv = label->priv;
PangoRectangle required_rect;
PangoRectangle natural_rect;
PangoRectangle widest_rect;
PangoRectangle highest_rect;
GtkBorder border;
gtk_label_get_preferred_layout_size (label, &required_rect, &natural_rect);
gtk_label_get_preferred_layout_size (label, &widest_rect, &highest_rect);
/* Now that we have minimum and natural sizes in pango extents, apply a possible transform */
if (priv->have_transform)
{
PangoLayout *copy;
PangoContext *context;
const PangoMatrix *matrix;
copy = pango_layout_copy (priv->layout);
context = pango_layout_get_context (copy);
context = pango_layout_get_context (priv->layout);
matrix = pango_context_get_matrix (context);
pango_layout_set_width (copy, -1);
pango_layout_set_ellipsize (copy, PANGO_ELLIPSIZE_NONE);
pango_matrix_transform_rectangle (matrix, &widest_rect);
pango_matrix_transform_rectangle (matrix, &highest_rect);
pango_layout_get_extents (copy, NULL, &natural_rect);
g_object_unref (copy);
pango_matrix_transform_rectangle (matrix, &required_rect);
pango_matrix_transform_rectangle (matrix, &natural_rect);
/* Bump the natural size in case of ellipsize to ensure pango has
/* Bump the size in case of ellipsize to ensure pango has
* enough space in the angles (note, we could alternatively set the
* layout to not ellipsize when we know we have been allocated our
* full natural size, or it may be that pango needs a fix here).
* full size, or it may be that pango needs a fix here).
*/
if (priv->ellipsize && priv->angle != 0 && priv->angle != 90 &&
priv->angle != 180 && priv->angle != 270 && priv->angle != 360)
@ -3624,16 +3600,18 @@ gtk_label_get_preferred_size (GtkWidget *widget,
/* For some reason we only need this at about 110 degrees, and only
* when gaining in height
*/
natural_rect.height += ROTATION_ELLIPSIZE_PADDING * 2 * PANGO_SCALE;
natural_rect.width += ROTATION_ELLIPSIZE_PADDING * 2 * PANGO_SCALE;
widest_rect.height += ROTATION_ELLIPSIZE_PADDING * 2 * PANGO_SCALE;
widest_rect.width += ROTATION_ELLIPSIZE_PADDING * 2 * PANGO_SCALE;
highest_rect.height += ROTATION_ELLIPSIZE_PADDING * 2 * PANGO_SCALE;
highest_rect.width += ROTATION_ELLIPSIZE_PADDING * 2 * PANGO_SCALE;
}
}
required_rect.width = PANGO_PIXELS_CEIL (required_rect.width);
required_rect.height = PANGO_PIXELS_CEIL (required_rect.height);
widest_rect.width = PANGO_PIXELS_CEIL (widest_rect.width);
widest_rect.height = PANGO_PIXELS_CEIL (widest_rect.height);
natural_rect.width = PANGO_PIXELS_CEIL (natural_rect.width);
natural_rect.height = PANGO_PIXELS_CEIL (natural_rect.height);
highest_rect.width = PANGO_PIXELS_CEIL (highest_rect.width);
highest_rect.height = PANGO_PIXELS_CEIL (highest_rect.height);
_gtk_misc_get_padding_and_border (GTK_MISC (label), &border);
@ -3650,15 +3628,15 @@ gtk_label_get_preferred_size (GtkWidget *widget,
*/
get_size_for_allocation (label,
GTK_ORIENTATION_VERTICAL,
required_rect.height,
highest_rect.height,
minimum_size, natural_size);
}
else
{
/* Normal desired width */
*minimum_size = required_rect.width;
*natural_size = natural_rect.width;
*minimum_size = highest_rect.width;
*natural_size = widest_rect.width;
}
*minimum_size += border.left + border.right;
@ -3677,7 +3655,7 @@ gtk_label_get_preferred_size (GtkWidget *widget,
*/
get_size_for_allocation (label,
GTK_ORIENTATION_HORIZONTAL,
required_rect.width,
widest_rect.width,
minimum_size, natural_size);
}
else
@ -3685,8 +3663,8 @@ gtk_label_get_preferred_size (GtkWidget *widget,
/* A vertically rotated label does w4h, so return the base
* desired height (text length)
*/
*minimum_size = required_rect.height;
*natural_size = natural_rect.height;
*minimum_size = widest_rect.height;
*natural_size = highest_rect.height;
}
*minimum_size += border.top + border.bottom;