Re-implement form validation message UI with native widgets (GTK)

chrome/browser/ui/gtk/validation_message_bubble_gtk.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/validation_message_bubble.h"
 
+#include "base/utf_string_conversions.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/gtk/bubble/bubble_gtk.h"
+#include "chrome/browser/ui/gtk/gtk_theme_service.h"
+#include "chrome/browser/ui/gtk/gtk_util.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "content/public/browser/web_contents.h"
+#include "grit/theme_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/gtk_util.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/rect.h"
+
+namespace {
+
+const int kPadding = 4;
+const int kIconTextMargin = 8;
+const int kTextMargin = 4;
+const int kTextMaxWidth = 256;
+
+// A GTK implementation of ValidationMessageBubble.
+class ValidationMessageBubbleGtk : public chrome::ValidationMessageBubble,
+                                   public BubbleDelegateGtk {
+ public:
+  ValidationMessageBubbleGtk(content::RenderWidgetHost* widget_host,
+                             const gfx::Rect& anchor_in_screen,
+                             const string16& main_text,
+                             const string16& sub_text);
+  virtual ~ValidationMessageBubbleGtk();
+
+  // BubbleDelegateGtk override:
+  virtual void BubbleClosing(BubbleGtk*, bool) OVERRIDE;
+
+ private:
+  static GtkWidget* constructContent(const string16& main_text,

[Nico, 2013/05/02 16:55:59]

nit: chromium style is to capitalize the first letter 

[tkent, 2013/05/03 14:53:03]

Done.

+                                     const string16& sub_text);
+
+  BubbleGtk* bubble_;
+};
+
+ValidationMessageBubbleGtk::ValidationMessageBubbleGtk(
+    content::RenderWidgetHost* widget_host,
+    const gfx::Rect& anchor_in_screen,
+    const string16& main_text,
+    const string16& sub_text)
+    : bubble_(NULL) {
+  if (!widget_host->IsRenderView())
+    return;
+  gfx::Rect bounds_in_screen = widget_host->GetView()->GetViewBounds();
+  gfx::Rect anchor = anchor_in_screen;
+  anchor.Offset(-bounds_in_screen.x(), -bounds_in_screen.y());
+
+  Profile* profile = Profile::FromBrowserContext(
+      content::WebContents::FromRenderViewHost(
+          content::RenderViewHost::From(widget_host))->GetBrowserContext());
+  bubble_ = BubbleGtk::Show(widget_host->GetView()->GetNativeView(),
+                            &anchor,
+                            constructContent(main_text, sub_text),
+                            BubbleGtk::ANCHOR_TOP_LEFT,
+                            BubbleGtk::POPUP_WINDOW,
+                            GtkThemeService::GetFrom(profile),
+                            this);
+}
+
+ValidationMessageBubbleGtk::~ValidationMessageBubbleGtk() {
+  if (bubble_)
+    bubble_->Close();
+}
+
+void ValidationMessageBubbleGtk::BubbleClosing(BubbleGtk*, bool) {
+  bubble_ = NULL;
+}
+
+// static
+GtkWidget* ValidationMessageBubbleGtk::constructContent(
+      const string16& main_text, const string16& sub_text) {
+  GtkWidget* icon = gtk_image_new();
+  gtk_misc_set_alignment(GTK_MISC(icon), 0.5, 0);
+  gtk_misc_set_padding(GTK_MISC(icon), 2, 2);

[Evan Stade, 2013/05/02 22:42:33]

what's this magic 2 for? why not add the padding in box_pack_start and set the
vertical alignment to 0.5?

[tkent, 2013/05/03 14:53:03]

I changed 2 to kPadding.
I don't want to center icon vertically. It should be put on the top of
icon_text_box with some padding.

+  ResourceBundle& bundle = ResourceBundle::GetSharedInstance();
+  GdkPixbuf* pixbuf = gfx::GdkPixbufFromSkBitmap(
+      *bundle.GetImageSkiaNamed(IDR_INPUT_ALERT)->bitmap());
+  gtk_image_set_from_pixbuf(GTK_IMAGE(icon), pixbuf);
+  g_object_unref(pixbuf);
+  GtkWidget* icon_text_box = gtk_hbox_new(FALSE, kIconTextMargin);
+  gtk_box_pack_start(GTK_BOX(icon_text_box), icon, FALSE, FALSE, 0);

[Evan Stade, 2013/05/02 22:42:33]

I think this is equivalent to gtk_container_add

[tkent, 2013/05/03 14:53:03]

Done.

+
+  GtkWidget* text_box = gtk_vbox_new(FALSE, kTextMargin);
+  GtkWidget* label = gtk_label_new(UTF16ToUTF8(main_text).c_str());
+  const gfx::Font& main_font = bundle.GetFont(ResourceBundle::MediumFont);
+  gtk_util::ForceFontSizePixels(label, main_font.GetHeight());
+  gtk_box_pack_start(
+      GTK_BOX(text_box), gtk_util::LeftAlignMisc(label), TRUE, TRUE, 0);
+
+  if (!sub_text.empty()) {
+    GtkWidget* sub_label = gtk_label_new(UTF16ToUTF8(sub_text).c_str());
+    const gfx::Font& sub_font = bundle.GetFont(ResourceBundle::BaseFont);
+    gtk_util::ForceFontSizePixels(sub_label, sub_font.GetHeight());
+    int max_characters = kTextMaxWidth / sub_font.GetAverageCharacterWidth();
+    if (sub_text.length() > static_cast<size_t>(max_characters))
+      gtk_util::SetLabelWidth(sub_label, kTextMaxWidth);
+    gtk_box_pack_start(
+        GTK_BOX(text_box), gtk_util::LeftAlignMisc(sub_label), TRUE, TRUE, 0);
+  }
+
+  gtk_box_pack_start(GTK_BOX(icon_text_box), text_box, FALSE, TRUE, 0);

[Evan Stade, 2013/05/02 22:42:33]

I think this is equivalent to gtk_container_add (note that the TRUE has no
effect because of the previous FALSE)

[tkent, 2013/05/03 14:53:03]

Done.

+
+  GtkWidget* content = gtk_alignment_new(0, 0, 0, 0);
+  gtk_alignment_set_padding(
+      GTK_ALIGNMENT(content), kPadding, kPadding, kPadding, kPadding);
+  gtk_container_add(GTK_CONTAINER(content), icon_text_box);
+  return content;
+}
+
+}  // namespace
+
 namespace chrome {
 
 scoped_ptr<ValidationMessageBubble> ValidationMessageBubble::CreateAndShow(
     content::RenderWidgetHost* widget_host,
     const gfx::Rect& anchor_in_screen,
     const string16& main_text,
     const string16& sub_text) {
-  // TODO(tkent): Implement this and enable it. crbug.com/235717.
-  return scoped_ptr<ValidationMessageBubble>().Pass();
+  return scoped_ptr<ValidationMessageBubble>(new ValidationMessageBubbleGtk(
+      widget_host, anchor_in_screen, main_text, sub_text)).Pass();
 }
 
-}
+}  // namespace chrome