src/chrome/browser/ui/gtk/gtk_chrome_link_button.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/gtk/gtk_chrome_link_button.h"
   6
   7 #include <stdlib.h>
   8
   9 #include "chrome/browser/ui/gtk/gtk_util.h"
  10 #include "ui/gfx/gtk_compat.h"
  11 #include "ui/gfx/gtk_util.h"
  12
  13 static const gchar* kLinkMarkup = "<u><span color=\"%s\">%s</span></u>";
  14 static const gchar* kInsensitiveLinkMarkup = "<span color=\"%s\">%s</span>";
  15
  16 namespace {
  17
  18 // Set the GTK style on our custom link button. We don't want any border around
  19 // the link text.
  20 void SetLinkButtonStyle() {
  21   static bool style_was_set = false;
  22
  23   if (style_was_set)
  24     return;
  25   style_was_set = true;
  26
  27   gtk_rc_parse_string(
  28       "style \"chrome-link-button\" {"
  29       "  GtkButton::inner-border = {0, 0, 0, 0}"
  30       "  GtkButton::child-displacement-x = 0"
  31       "  GtkButton::child-displacement-y = 0"
  32       "  xthickness = 0"
  33       "  ythickness = 0"
  34       "}"
  35       "widget_class \"*.<GtkChromeLinkButton>\" style \"chrome-link-button\"");
  36 }
  37
  38 static void gtk_chrome_link_button_destroy_text_resources(
  39     GtkChromeLinkButton* button) {
  40   g_free(button->native_markup);
  41   button->native_markup = NULL;
  42   g_free(button->normal_markup);
  43   button->normal_markup = NULL;
  44   g_free(button->pressed_markup);
  45   button->pressed_markup = NULL;
  46   g_free(button->insensitive_markup);
  47   button->insensitive_markup = NULL;
  48
  49   g_free(button->text);
  50   button->text = NULL;
  51 }
  52
  53 }  // namespace
  54
  55 G_BEGIN_DECLS
  56 G_DEFINE_TYPE(GtkChromeLinkButton, gtk_chrome_link_button, GTK_TYPE_BUTTON)
  57
  58 static void gtk_chrome_link_button_set_text(GtkChromeLinkButton* button) {
  59   // If we were called before we were realized, abort. We'll be called for
  60   // real when |button| is realized.
  61   if (!gtk_widget_get_realized(GTK_WIDGET(button)))
  62     return;
  63
  64   g_free(button->native_markup);
  65   button->native_markup = NULL;
  66   g_free(button->normal_markup);
  67   button->normal_markup = NULL;
  68   g_free(button->pressed_markup);
  69   button->pressed_markup = NULL;
  70   g_free(button->insensitive_markup);
  71   button->insensitive_markup = NULL;
  72
  73   gchar* text = button->text;
  74   gboolean uses_markup = button->uses_markup;
  75
  76   GtkStyle* style = gtk_rc_get_style(button->label);
  77   GdkColor insensitive_color = style->fg[GTK_STATE_INSENSITIVE];
  78   gchar insensitive_color_spec[9];
  79   snprintf(insensitive_color_spec, 9, "#%02X%02X%02X",
  80            insensitive_color.red / 257, insensitive_color.green / 257,
  81            insensitive_color.blue / 257);
  82
  83   if (!uses_markup) {
  84     button->normal_markup = g_markup_printf_escaped(kLinkMarkup,
  85                                                     button->normal_color,
  86                                                     text);
  87     button->pressed_markup = g_markup_printf_escaped(kLinkMarkup, "red", text);
  88     button->insensitive_markup = g_markup_printf_escaped(kInsensitiveLinkMarkup,
  89                                                          insensitive_color_spec,
  90                                                          text);
  91   } else {
  92     button->normal_markup = g_strdup_printf(kLinkMarkup, button->normal_color,
  93                                             text);
  94
  95     button->pressed_markup = g_strdup_printf(kLinkMarkup, "red", text);
  96     button->insensitive_markup = g_strdup_printf(kInsensitiveLinkMarkup,
  97                                                  insensitive_color_spec,
  98                                                  text);
  99   }
 100
 101   // Get the current GTK theme's link button text color.
 102   GdkColor* native_color = NULL;
 103   gtk_widget_style_get(GTK_WIDGET(button), "link-color", &native_color, NULL);
 104
 105   if (native_color) {
 106     gchar color_spec[9];
 107     snprintf(color_spec, 9, "#%02X%02X%02X", native_color->red / 257,
 108              native_color->green / 257, native_color->blue / 257);
 109     gdk_color_free(native_color);
 110
 111     if (!uses_markup) {
 112       button->native_markup = g_markup_printf_escaped(kLinkMarkup,
 113           color_spec, text);
 114     } else {
 115       button->native_markup = g_strdup_printf(kLinkMarkup, color_spec, text);
 116     }
 117   } else {
 118     // If the theme doesn't have a link color, just use blue. This matches the
 119     // default for GtkLinkButton.
 120     button->native_markup = g_strdup(button->normal_markup);
 121   }
 122
 123   gtk_label_set_markup(GTK_LABEL(button->label),
 124       button->using_native_theme ? button->native_markup :
 125       button->normal_markup);
 126 }
 127
 128 static void gtk_chrome_link_button_style_changed(GtkChromeLinkButton* button) {
 129   // Regenerate the link with the possibly new colors after the user has
 130   // changed his GTK style.
 131   gtk_chrome_link_button_set_text(button);
 132
 133   if (gtk_widget_get_visible(GTK_WIDGET(button)))
 134     gtk_widget_queue_draw(GTK_WIDGET(button));
 135 }
 136
 137 static gboolean gtk_chrome_link_button_expose(GtkWidget* widget,
 138                                               GdkEventExpose* event) {
 139   GtkChromeLinkButton* button = GTK_CHROME_LINK_BUTTON(widget);
 140   GtkWidget* label = button->label;
 141   GtkStateType widget_state = gtk_widget_get_state(widget);
 142
 143   if (widget_state != button->label_state) {
 144     switch (widget_state) {
 145       case GTK_STATE_NORMAL:
 146         gtk_label_set_markup(GTK_LABEL(label),
 147             button->using_native_theme ? button->native_markup :
 148                                          button->normal_markup);
 149         break;
 150       case GTK_STATE_ACTIVE:
 151         gtk_label_set_markup(GTK_LABEL(label), button->pressed_markup);
 152         break;
 153       case GTK_STATE_INSENSITIVE:
 154         gtk_label_set_markup(GTK_LABEL(label), button->insensitive_markup);
 155         break;
 156       default:
 157         break;
 158     }
 159     button->label_state = widget_state;
 160   }
 161
 162   // Draw the link inside the button.
 163   gtk_container_propagate_expose(GTK_CONTAINER(widget), label, event);
 164
 165   // Draw the focus rectangle.
 166   if (gtk_widget_has_focus(widget)) {
 167     GtkAllocation allocation;
 168     gtk_widget_get_allocation(widget, &allocation);
 169     gtk_paint_focus(gtk_widget_get_style(widget),
 170                     gtk_widget_get_window(widget),
 171                     gtk_widget_get_state(widget),
 172                     &event->area, widget, NULL,
 173                     allocation.x, allocation.y,
 174                     allocation.width, allocation.height);
 175   }
 176
 177   return TRUE;
 178 }
 179
 180 static void gtk_chrome_link_button_enter(GtkButton* button) {
 181   GtkWidget* widget = GTK_WIDGET(button);
 182   GtkChromeLinkButton* link_button = GTK_CHROME_LINK_BUTTON(button);
 183   gdk_window_set_cursor(gtk_widget_get_window(widget),
 184                         link_button->hand_cursor);
 185 }
 186
 187 static void gtk_chrome_link_button_leave(GtkButton* button) {
 188   GtkWidget* widget = GTK_WIDGET(button);
 189   gdk_window_set_cursor(gtk_widget_get_window(widget), NULL);
 190 }
 191
 192 static void gtk_chrome_link_button_destroy(GtkObject* object) {
 193   GtkChromeLinkButton* button = GTK_CHROME_LINK_BUTTON(object);
 194
 195   gtk_chrome_link_button_destroy_text_resources(button);
 196
 197   button->hand_cursor = NULL;
 198
 199   GTK_OBJECT_CLASS(gtk_chrome_link_button_parent_class)->destroy(object);
 200 }
 201
 202 static void gtk_chrome_link_button_class_init(
 203     GtkChromeLinkButtonClass* link_button_class) {
 204   GtkWidgetClass* widget_class =
 205       reinterpret_cast<GtkWidgetClass*>(link_button_class);
 206   GtkButtonClass* button_class =
 207       reinterpret_cast<GtkButtonClass*>(link_button_class);
 208   GtkObjectClass* object_class =
 209       reinterpret_cast<GtkObjectClass*>(link_button_class);
 210   widget_class->expose_event = &gtk_chrome_link_button_expose;
 211   button_class->enter = &gtk_chrome_link_button_enter;
 212   button_class->leave = &gtk_chrome_link_button_leave;
 213   object_class->destroy = &gtk_chrome_link_button_destroy;
 214 }
 215
 216 static void gtk_chrome_link_button_init(GtkChromeLinkButton* button) {
 217   SetLinkButtonStyle();
 218
 219   // We put a label in a button so we can connect to the click event. We don't
 220   // let the button draw itself; catch all expose events to the button and pass
 221   // them through to the label.
 222   button->label = gtk_label_new(NULL);
 223   button->normal_markup = NULL;
 224   button->pressed_markup = NULL;
 225   button->label_state = GTK_STATE_NORMAL;
 226   strncpy(button->normal_color, "blue", 9);
 227   button->native_markup = NULL;
 228   button->using_native_theme = TRUE;
 229   button->hand_cursor = gfx::GetCursor(GDK_HAND2);
 230   button->text = NULL;
 231
 232   gtk_container_add(GTK_CONTAINER(button), button->label);
 233   gtk_widget_set_app_paintable(GTK_WIDGET(button), TRUE);
 234   g_signal_connect(button, "realize",
 235                    G_CALLBACK(gtk_chrome_link_button_set_text), NULL);
 236   g_signal_connect(button, "style-set",
 237                    G_CALLBACK(gtk_chrome_link_button_style_changed), NULL);
 238 }
 239
 240 GtkWidget* gtk_chrome_link_button_new(const char* text) {
 241   GtkWidget* lb = GTK_WIDGET(g_object_new(GTK_TYPE_CHROME_LINK_BUTTON, NULL));
 242   GTK_CHROME_LINK_BUTTON(lb)->text = g_strdup(text);
 243   GTK_CHROME_LINK_BUTTON(lb)->uses_markup = FALSE;
 244
 245   return lb;
 246 }
 247
 248 GtkWidget* gtk_chrome_link_button_new_with_markup(const char* markup) {
 249   GtkWidget* lb = GTK_WIDGET(g_object_new(GTK_TYPE_CHROME_LINK_BUTTON, NULL));
 250   GTK_CHROME_LINK_BUTTON(lb)->text = g_strdup(markup);
 251   GTK_CHROME_LINK_BUTTON(lb)->uses_markup = TRUE;
 252
 253   return lb;
 254 }
 255
 256 void gtk_chrome_link_button_set_use_gtk_theme(GtkChromeLinkButton* button,
 257                                               gboolean use_gtk) {
 258   if (use_gtk != button->using_native_theme) {
 259     button->using_native_theme = use_gtk;
 260
 261     gtk_chrome_link_button_set_text(button);
 262
 263     if (gtk_widget_get_visible(GTK_WIDGET(button)))
 264       gtk_widget_queue_draw(GTK_WIDGET(button));
 265   }
 266 }
 267
 268 void gtk_chrome_link_button_set_label(GtkChromeLinkButton* button,
 269                                       const char* text) {
 270   g_free(button->text);
 271   button->text = g_strdup(text);
 272
 273   gtk_chrome_link_button_set_text(button);
 274
 275   if (gtk_widget_get_visible(GTK_WIDGET(button)))
 276     gtk_widget_queue_draw(GTK_WIDGET(button));
 277 }
 278
 279 void gtk_chrome_link_button_set_normal_color(GtkChromeLinkButton* button,
 280                                              const GdkColor* color) {
 281   if (color) {
 282     snprintf(button->normal_color, 9, "#%02X%02X%02X", color->red / 257,
 283              color->green / 257, color->blue / 257);
 284   } else {
 285     strncpy(button->normal_color, "blue", 9);
 286   }
 287
 288   gtk_chrome_link_button_set_text(button);
 289
 290   if (gtk_widget_get_visible(GTK_WIDGET(button)))
 291     gtk_widget_queue_draw(GTK_WIDGET(button));
 292 }
 293
 294 G_END_DECLS