Experiments with a new tabstrip + animator

chrome/browser/views/tabs/browser_tab_strip.cc

+// Copyright (c) 2009 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/views/tabs/browser_tab_strip.h"
+
+#include "chrome/browser/tab_contents/tab_contents.h"
+
+namespace {
+
+////////////////////////////////////////////////////////////////////////////////
+// RemovingTabModel
+//  After a tab is removed from the TabStrip2's model, the model can no longer
+//  provide information about the tab needed to update the display, however the
+//  TabStrip2 continues to display the tab until it animates out of existence.
+//  During this period, this model serves as a dummy. It is created and assigned
+//  to the tab when the tab is removed from the model and owned by the Tab2.
+
+class RemovingTabModel : public Tab2Model {
+ public:
+  explicit RemovingTabModel(TabContents* source)
+      : title_(source->GetTitle()) {
+  }
+
+  // Overridden from Tab2Model:
+  virtual string16 GetTitle(Tab2* tab) const { return title_; }
+  virtual bool IsSelected(Tab2* tab) const { return false; }
+  virtual void SelectTab(Tab2* tab) { NOTREACHED(); }
+  virtual void CaptureDragInfo(Tab2* tab,
+                               const views::MouseEvent& drag_event) {
+    NOTREACHED();
+  }
+  virtual bool DragTab(Tab2* tab, const views::MouseEvent& drag_event) {
+    NOTREACHED();
+    return false;
+  }
+  virtual void DragEnded(Tab2* tab) {
+    NOTREACHED();
+  }
+  virtual views::AnimatorDelegate* AsAnimatorDelegate() {
+    NOTREACHED();
+    return NULL;
+  }
+
+ private:
+  string16 title_;
+
+  DISALLOW_COPY_AND_ASSIGN(RemovingTabModel);
+};
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+// BrowserTabStrip, public:
+
+BrowserTabStrip::BrowserTabStrip(TabStripModel* model)
+    : TabStrip2(this),
+      model_(model) {
+  model_->AddObserver(this);
+}
+
+BrowserTabStrip::~BrowserTabStrip() {
+  model_->RemoveObserver(this);
+}
+
+TabContents* BrowserTabStrip::DetachTab(int index) {
+  TabContents* contents = model_->GetTabContentsAt(index);
+  model_->DetachTabContentsAt(index);
+  return contents;
+}
+
+void BrowserTabStrip::AttachTab(TabContents* contents,
+                                const gfx::Point& screen_point,
+                                const gfx::Rect& tab_screen_bounds) {
+  gfx::Point tabstrip_point(screen_point);
+
+  gfx::Point screen_origin;
+  View::ConvertPointToScreen(this, &screen_origin);
+  tabstrip_point.Offset(-screen_origin.x(), -screen_origin.y());
+
+  int index = GetInsertionIndexForPoint(tabstrip_point);
+  model_->InsertTabContentsAt(index, contents, true, false);
+
+  gfx::Point origin(tab_screen_bounds.origin());
+  View::ConvertPointToView(NULL, this, &origin);
+  ResumeDraggingTab(index, gfx::Rect(origin, tab_screen_bounds.size()));
+  // TODO(beng): post task to continue dragging now.
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// BrowserTabStrip, TabStripModelObserver overrides:
+
+void BrowserTabStrip::TabInsertedAt(TabContents* contents,
+                                    int index,
+                                    bool foreground) {
+  AddTabAt(index);
+}
+
+void BrowserTabStrip::TabDetachedAt(TabContents* contents, int index) {
+  RemoveTabAt(index, new RemovingTabModel(contents));
+}
+
+void BrowserTabStrip::TabSelectedAt(TabContents* old_contents,
+                                    TabContents* contents,
+                                    int index,
+                                    bool user_gesture) {
+  TabStrip2::SelectTabAt(index);
+}
+
+void BrowserTabStrip::TabMoved(TabContents* contents,
+                               int from_index,
+                               int to_index) {
+  TabStrip2::MoveTabAt(from_index, to_index);
+}
+
+void BrowserTabStrip::TabChangedAt(TabContents* contents, int index) {
+  // TODO
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// BrowserTabStrip, TabStrip2Model overrides:
+
+string16 BrowserTabStrip::GetTitle(int index) const {
+  return model_->GetTabContentsAt(index)->GetTitle();
+}
+
+bool BrowserTabStrip::IsSelected(int index) const {
+  return model_->selected_index() == index;
+}
+
+void BrowserTabStrip::SelectTabAt(int index) {
+  model_->SelectTabContentsAt(index, true);
+}
+
+bool BrowserTabStrip::CanDragTabs() const {
+  return model_->delegate()->GetDragActions() != 0;
+}
+
+void BrowserTabStrip::MoveTabAt(int index, int to_index) {
+  model_->MoveTabContentsAt(index, to_index, true);
+}
+
+void BrowserTabStrip::DetachTabAt(int index, const gfx::Rect& window_bounds,
+                                  const gfx::Rect& tab_bounds) {
+  TabContents* contents = DetachTab(index);
+  model_->delegate()->ContinueDraggingDetachedTab(contents, window_bounds,
+                                                  tab_bounds);
+}