Support painting panels with chromium themes on GTK.

chrome/browser/ui/panels/panel_browser_titlebar_gtk.cc

Index: chrome/browser/ui/panels/panel_browser_titlebar_gtk.cc
diff --git a/chrome/browser/ui/panels/panel_browser_titlebar_gtk.cc b/chrome/browser/ui/panels/panel_browser_titlebar_gtk.cc
index d1d80dc45a58f66b0b2c1dfecd9890131a07081c..44f93f0752ffbea9a5034aa79bf6529889c3b706 100644
--- a/chrome/browser/ui/panels/panel_browser_titlebar_gtk.cc
+++ b/chrome/browser/ui/panels/panel_browser_titlebar_gtk.cc
@@ -4,11 +4,17 @@
 
 #include "chrome/browser/ui/panels/panel_browser_titlebar_gtk.h"
 
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/gtk/custom_button.h"
+#include "chrome/browser/ui/gtk/gtk_util.h"
+#include "chrome/browser/ui/gtk/theme_service_gtk.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_browser_window_gtk.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
+#include "ui/base/gtk/gtk_compat.h"
+#include "ui/gfx/skia_utils_gtk.h"
 
 namespace {
 
@@ -18,6 +24,27 @@ const int kPanelButtonSpacing = 7;
 // Spacing around outside of panel's titlebar buttons.
 const int kPanelButtonOuterPadding = 7;
 
+// Markup for painting title as bold.
+const char* const kTitleMarkupPrefix = "<span font_weight='bold'>";
+const char* const kTitleMarkupSuffix = "</span>";
+
+// Colors used to draw title in attention mode.
+const SkColor kAttentionTitleTextDefaultColor = SK_ColorWHITE;
+
+// Alpha value used in drawing inactive titlebar under non-default theme.
+const U8CPU kInactiveAlphaBlending = 0x80;
+
+SkColor BlendSkColorWithAlpha(SkColor fg_color, SkColor bg_color, U8CPU alpha) {
+  if (alpha == 255)
+      return fg_color;
+  double fg_ratio = alpha / 255.0;
+  double bg_ratio = 1.0 - fg_ratio;
+  return SkColorSetRGB(
+      (SkColorGetR(fg_color) * fg_ratio + SkColorGetR(bg_color) * bg_ratio),
+      (SkColorGetG(fg_color) * fg_ratio + SkColorGetG(bg_color) * bg_ratio),
+      (SkColorGetB(fg_color) * fg_ratio + SkColorGetB(bg_color) * bg_ratio));
+}
+
 }  // namespace
 
 PanelBrowserTitlebarGtk::PanelBrowserTitlebarGtk(
@@ -29,6 +56,41 @@ PanelBrowserTitlebarGtk::PanelBrowserTitlebarGtk(
 PanelBrowserTitlebarGtk::~PanelBrowserTitlebarGtk() {
 }
 
+SkColor PanelBrowserTitlebarGtk::GetTextColor() const {
+  PanelBrowserWindowGtk::PaintState paint_state =
+      browser_window_->GetPaintState();
+  if (paint_state == PanelBrowserWindowGtk::PAINT_FOR_ATTENTION)
+    return kAttentionTitleTextDefaultColor;
+
+  return paint_state == PanelBrowserWindowGtk::PAINT_AS_ACTIVE ?
+      theme_service()->GetColor(ThemeService::COLOR_TAB_TEXT) :
+      BlendSkColorWithAlpha(
+          theme_service()->GetColor(ThemeService::COLOR_BACKGROUND_TAB_TEXT),
+          theme_service()->GetColor(ThemeService::COLOR_TOOLBAR),
+          kInactiveAlphaBlending);
+}
+
+void PanelBrowserTitlebarGtk::UpdateButtonBackground(CustomDrawButton* button) {
+  // Don't need to update background since we're using transparent background.
+}
+
+void PanelBrowserTitlebarGtk::UpdateTitleAndIcon() {
+  DCHECK(app_mode_title());
+
+  std::string title =
+      UTF16ToUTF8(browser_window_->browser()->GetWindowTitleForCurrentTab());
+
+  // Add the markup to show the title as bold.
+  gchar* escaped_title = g_markup_escape_text(title.c_str(), -1);
+  gchar* title_with_markup = g_strconcat(kTitleMarkupPrefix,
+                                         escaped_title,
+                                         kTitleMarkupSuffix,
+                                         NULL);
+  gtk_label_set_markup(GTK_LABEL(app_mode_title()), title_with_markup);
+  g_free(escaped_title);
+  g_free(title_with_markup);
+}
+
 bool PanelBrowserTitlebarGtk::BuildButton(const std::string& button_token,
                                           bool left_side) {
   // Panel only shows close and minimize/restore buttons.
@@ -94,3 +156,51 @@ void PanelBrowserTitlebarGtk::HandleButtonClick(GtkWidget* button) {
 void PanelBrowserTitlebarGtk::ShowFaviconMenu(GdkEventButton* event) {
   // Favicon menu is not supported in panels.
 }
+
+void PanelBrowserTitlebarGtk::UpdateTextColor() {
+  DCHECK(app_mode_title());
+
+  GdkColor text_color = gfx::SkColorToGdkColor(GetTextColor());
+  gtk_util::SetLabelColor(app_mode_title(), &text_color);
+}
+
+void PanelBrowserTitlebarGtk::SendEnterNotifyToCloseButtonIfUnderMouse() {
+  if (!close_button())
+    return;
+
+  gint x;
+  gint y;
+  GtkAllocation widget_allocation = close_button()->WidgetAllocation();
+  gtk_widget_get_pointer(GTK_WIDGET(close_button()->widget()), &x, &y);
+
+  gfx::Rect button_rect(0, 0, widget_allocation.width,
+                        widget_allocation.height);
+  if (!button_rect.Contains(x, y)) {
+    // Mouse is not over the close button.
+    return;
+  }
+
+  // Create and emit an enter-notify-event on close button.
+  GValue return_value;
+  return_value.g_type = G_TYPE_BOOLEAN;
+  g_value_set_boolean(&return_value, false);
+
+  GdkEvent* event = gdk_event_new(GDK_ENTER_NOTIFY);
+  event->crossing.window =
+      gtk_button_get_event_window(GTK_BUTTON(close_button()->widget()));
+  event->crossing.send_event = FALSE;
+  event->crossing.subwindow = gtk_widget_get_window(close_button()->widget());
+  event->crossing.time = gtk_util::XTimeNow();
+  event->crossing.x = x;
+  event->crossing.y = y;
+  event->crossing.x_root = widget_allocation.x;
+  event->crossing.y_root = widget_allocation.y;
+  event->crossing.mode = GDK_CROSSING_NORMAL;
+  event->crossing.detail = GDK_NOTIFY_ANCESTOR;
+  event->crossing.focus = true;
+  event->crossing.state = 0;
+
+  g_signal_emit_by_name(GTK_OBJECT(close_button()->widget()),
+                        "enter-notify-event", event,
+                        &return_value);
+}