Sidebar mini tabs UI (views version)....

chrome/browser/ui/views/sidebar/sidebar_tab_strip_host.cc

+// Copyright (c) 2010 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/views/sidebar/sidebar_tab_strip_host.h"
+
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/view_ids.h"
+#include "chrome/browser/ui/views/frame/browser_view.h"
+#include "chrome/browser/ui/views/sidebar/sidebar_base_tab.h"
+#include "chrome/browser/ui/views/sidebar/sidebar_base_tab_strip.h"
+#include "gfx/path.h"
+#include "gfx/rect.h"
+#include "gfx/size.h"
+#include "views/widget/widget.h"
+
+#if defined(OS_WIN)
+#include "base/win/scoped_gdi_object.h"
+#elif defined(OS_LINUX)
+#include "ui/base/gtk/scoped_handle_gtk.h"
+#endif
+
+namespace {
+#if defined(OS_WIN)
+typedef base::win::ScopedRegion ScopedPlatformRegion;
+#elif defined(OS_LINUX)
+typedef ui::ScopedRegion ScopedPlatformRegion;
+#else
+#error Need OS specific ScopedRegion implementation
+#endif
+}  // namespace
+
+SidebarTabStripHost::SidebarTabStripHost(BrowserView* browser_view)
+    : browser_view_(browser_view) {
+}
+
+void SidebarTabStripHost::Init(SidebarBaseTabStrip* view) {
+  view_ = view;
+
+  // Initialize the host.
+  host_.reset(CreateHost());
+  host_->InitWithWidget(browser_view_->GetWidget(), gfx::Rect());
+  host_->SetContentsView(view_);
+}
+
+SidebarTabStripHost::~SidebarTabStripHost() {
+}
+
+void SidebarTabStripHost::SetPosition(const gfx::Rect& new_pos) {
+  if (new_pos.IsEmpty()) {
+    host_->Hide();
+    return;
+  }
+
+  SetWidgetPositionNative(new_pos, false);
+
+  if (!host_->IsVisible())
+    host_->Show();
+}
+
+// The host widget needs its shape to match the tab strip, so we create
+// a polygon that corresponds to the tab strip shape. The polygon is then
+// given to SetWindowRgn which changes the window from being a rectangle
+// in shape, to match the current shape of the sidebar tab strip.
+void SidebarTabStripHost::UpdateWindowEdges() {
+  // Update window shape to match the view shape.
+  ScopedPlatformRegion region;
+  for (int i = 0; i < view()->tab_count(); ++i) {
+    gfx::Path tab_shape;
+    SidebarBaseTab* tab = view()->base_tab_at_tab_index(i);
+    tab->GetShape(&tab_shape);
+
+    tab_shape.offset(SkIntToScalar(tab->x()), SkIntToScalar(tab->y()));
+
+    if (!region.Get()) {
+      region.Set(tab_shape.CreateNativeRegion());
+    } else {
+      ScopedPlatformRegion tab_region(tab_shape.CreateNativeRegion());
+      region.Set(gfx::Path::CombineRegions(tab_region.Get(), region.Get()));
+    }
+  }
+  host_->SetShape(region.release());
+}
+
+gfx::Size SidebarTabStripHost::GetContentsSize() const {
+  return view_->size();
+}
+