89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "browser/ui/gtk/gtk_util.h"
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#include <cairo/cairo.h>
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#include "base/logging.h"
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namespace gtk_util {
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namespace {
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const char kBoldLabelMarkup[] = "<span weight='bold'>%s</span>";
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// Returns the approximate number of characters that can horizontally fit in
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// |pixel_width| pixels.
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int GetCharacterWidthForPixels(GtkWidget* widget, int pixel_width) {
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DCHECK(gtk_widget_get_realized(widget))
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<< " widget must be realized to compute font metrics correctly";
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PangoContext* context = gtk_widget_create_pango_context(widget);
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GtkStyle* style = gtk_widget_get_style(widget);
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PangoFontMetrics* metrics = pango_context_get_metrics(context,
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style->font_desc, pango_context_get_language(context));
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// This technique (max of char and digit widths) matches the code in
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// gtklabel.c.
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int char_width = pixel_width * PANGO_SCALE /
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std::max(pango_font_metrics_get_approximate_char_width(metrics),
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pango_font_metrics_get_approximate_digit_width(metrics));
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pango_font_metrics_unref(metrics);
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g_object_unref(context);
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return char_width;
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}
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void OnLabelRealize(GtkWidget* label, gpointer pixel_width) {
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gtk_label_set_width_chars(
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GTK_LABEL(label),
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GetCharacterWidthForPixels(label, GPOINTER_TO_INT(pixel_width)));
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}
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} // namespace
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GtkWidget* LeftAlignMisc(GtkWidget* misc) {
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gtk_misc_set_alignment(GTK_MISC(misc), 0, 0.5);
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return misc;
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}
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GtkWidget* CreateBoldLabel(const std::string& text) {
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GtkWidget* label = gtk_label_new(NULL);
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char* markup = g_markup_printf_escaped(kBoldLabelMarkup, text.c_str());
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gtk_label_set_markup(GTK_LABEL(label), markup);
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g_free(markup);
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return LeftAlignMisc(label);
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}
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bool IsWidgetAncestryVisible(GtkWidget* widget) {
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GtkWidget* parent = widget;
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while (parent && gtk_widget_get_visible(parent))
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parent = gtk_widget_get_parent(parent);
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return !parent;
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}
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void SetLabelWidth(GtkWidget* label, int pixel_width) {
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gtk_label_set_line_wrap(GTK_LABEL(label), TRUE);
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gtk_misc_set_alignment(GTK_MISC(label), 0, 0.5);
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// Do the simple thing in LTR because the bug only affects right-aligned
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// text. Also, when using the workaround, the label tries to maintain
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// uniform line-length, which we don't really want.
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if (gtk_widget_get_direction(label) == GTK_TEXT_DIR_LTR) {
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gtk_widget_set_size_request(label, pixel_width, -1);
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} else {
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// The label has to be realized before we can adjust its width.
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if (gtk_widget_get_realized(label)) {
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OnLabelRealize(label, GINT_TO_POINTER(pixel_width));
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} else {
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g_signal_connect(label, "realize", G_CALLBACK(OnLabelRealize),
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GINT_TO_POINTER(pixel_width));
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}
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}
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}
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} // namespace gtk_util
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