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label: Don't try to guess a label's size

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People should use window default sizes or label
width-chars/max-width-chars to find the idea layout for a label inside
of relying on magic.
This commit is contained in:
Benjamin Otte 2011-04-17 20:35:29 +02:00
parent b5dc24fd28
commit c8ce1106c1
1 changed files with 4 additions and 123 deletions
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127
gtk/gtklabel.c
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@ -3291,117 +3291,6 @@ gtk_label_invalidate_wrap_width (GtkLabel *label)
priv->wrap_width = -1;
}
static gint
get_label_wrap_width (GtkLabel *label)
{
GtkLabelPrivate *priv = label->priv;
if (priv->wrap_width < 0)
{
if (priv->width_chars > 0)
{
PangoLayout *layout;
PangoContext *context;
PangoFontMetrics *metrics;
PangoRectangle rect;
gint char_width, digit_width, char_pixels, text_width;
layout = gtk_label_get_measuring_layout (label, NULL, -1);
context = pango_layout_get_context (layout);
metrics = get_font_metrics (context, GTK_WIDGET (label));
char_width = pango_font_metrics_get_approximate_char_width (metrics);
digit_width = pango_font_metrics_get_approximate_digit_width (metrics);
char_pixels = MAX (char_width, digit_width);
pango_font_metrics_unref (metrics);
pango_layout_get_extents (layout, NULL, &rect);
g_object_unref (layout);
text_width = rect.width;
priv->wrap_width = PANGO_PIXELS (MAX (text_width, char_pixels * priv->width_chars));
}
else
{
PangoLayout *layout;
layout = gtk_widget_create_pango_layout (GTK_WIDGET (label),
"This string is just about long enough.");
pango_layout_get_size (layout, &priv->wrap_width, NULL);
g_object_unref (layout);
}
}
return priv->wrap_width;
}
static PangoLayout *
gtk_label_get_layout_with_guessed_wrap_width (GtkLabel *label)
{
GdkScreen *screen;
PangoRectangle logical_rect;
gint wrap_width, width, height, longest_paragraph;
PangoLayout *layout;
if (!label->priv->wrap)
return gtk_label_get_measuring_layout (label, NULL, -1);
screen = gtk_widget_get_screen (GTK_WIDGET (label));
layout = gtk_label_get_measuring_layout (label, NULL, -1);
pango_layout_get_extents (layout, NULL, &logical_rect);
width = logical_rect.width;
/* Try to guess a reasonable maximum width */
longest_paragraph = width;
wrap_width = get_label_wrap_width (label);
width = MIN (width, wrap_width);
width = MIN (width,
PANGO_SCALE * (gdk_screen_get_width (screen) + 1) / 2);
layout = gtk_label_get_measuring_layout (label, layout, width);
pango_layout_get_extents (layout, NULL, &logical_rect);
width = logical_rect.width;
height = logical_rect.height;
/* Unfortunately, the above may leave us with a very unbalanced looking paragraph,
* so we try short search for a narrower width that leaves us with the same height
*/
if (longest_paragraph > 0)
{
gint nlines, perfect_width;
nlines = pango_layout_get_line_count (layout);
perfect_width = (longest_paragraph + nlines - 1) / nlines;
if (perfect_width < width)
{
layout = gtk_label_get_measuring_layout (label, layout, perfect_width);
pango_layout_get_extents (layout, NULL, &logical_rect);
if (logical_rect.height <= height)
width = logical_rect.width;
else
{
gint mid_width = (perfect_width + width) / 2;
if (mid_width > perfect_width)
{
layout = gtk_label_get_measuring_layout (label, layout, mid_width);
pango_layout_get_extents (layout, NULL, &logical_rect);
if (logical_rect.height <= height)
width = logical_rect.width;
}
}
}
}
return gtk_label_get_measuring_layout (label, layout, width);
}
static void
gtk_label_update_layout_width (GtkLabel *label)
{
@ -3655,8 +3544,7 @@ gtk_label_get_preferred_layout_size (GtkLabel *label,
{
GtkLabelPrivate *priv = label->priv;
PangoLayout *layout;
PangoRectangle rect;
gint text_width, guess_width;
gint text_width;
/* "width-chars" Hard-coded minimum width:
* - minimum size should be MAX (width-chars, strlen ("..."));
@ -3668,9 +3556,7 @@ gtk_label_get_preferred_layout_size (GtkLabel *label,
*
*/
/* When calculating ->wrap sometimes we need to invent a size; Ideally we should be doing
* that stuff here instead of inside gtk_label_ensure_layout() */
layout = gtk_label_get_layout_with_guessed_wrap_width (label);
layout = gtk_label_get_measuring_layout (label, NULL, -1);
/* Start off with the pixel extents of the rendered layout */
pango_layout_get_extents (layout, NULL, required);
@ -3681,13 +3567,8 @@ gtk_label_get_preferred_layout_size (GtkLabel *label,
*natural = *required;
guess_width = required->width;
layout = gtk_label_get_measuring_layout (label, layout, -1);
/* Fetch the length of the complete unwrapped text */
pango_layout_get_extents (layout, NULL, &rect);
text_width = rect.width;
text_width = required->width;
/* "width-chars" Hard-coded minimum width:
* - minimum size should be MAX (width-chars, strlen ("..."));
@ -3726,7 +3607,7 @@ gtk_label_get_preferred_layout_size (GtkLabel *label,
* an accordingly large size will be required for the label height.
*/
if (priv->wrap && priv->width_chars <= 0)
required->width = guess_width;
required->width = text_width;
if (priv->max_width_chars < 0)
{