text: // Copyright (c) 2012 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.
  
  #ifndef CHROME_BROWSER_UI_VIEWS_DOWNLOAD_DOWNLOAD_SHELF_VIEW_H_
  #define CHROME_BROWSER_UI_VIEWS_DOWNLOAD_DOWNLOAD_SHELF_VIEW_H_
  
  #include <stddef.h>
  
  #include <vector>
  
  #include "base/compiler_specific.h"
  #include "base/macros.h"
  #include "chrome/browser/download/download_shelf.h"
  #include "ui/gfx/animation/animation_delegate.h"
  #include "ui/gfx/animation/slide_animation.h"
  #include "ui/views/accessible_pane_view.h"
  #include "ui/views/controls/button/button.h"
  #include "ui/views/controls/link_listener.h"
  #include "ui/views/mouse_watcher.h"
  
  class Browser;
  class BrowserView;
  class DownloadItemView;
  
  namespace content {
  class PageNavigator;
  }
  
  namespace download {
  class DownloadItem;
  }
  
  namespace views {
  class ImageButton;
  class MdTextButton;
  }
  
  // DownloadShelfView is a view that contains individual views for each download,
  // as well as a close button and a link to show all downloads.
  //
  // DownloadShelfView does not hold an infinite number of download views, rather
  // it'll automatically remove views once a certain point is reached.
  class DownloadShelfView : public views::AccessiblePaneView,
                            public gfx::AnimationDelegate,
                            public DownloadShelf,
                            public views::ButtonListener,
                            public views::LinkListener,
                            public views::MouseWatcherListener {
   public:
    DownloadShelfView(Browser* browser, BrowserView* parent);
    ~DownloadShelfView() override;
  
    // Sent from the DownloadItemView when the user opens an item.
    void OpenedDownload();
  
    // Returns the relevant containing object that can load pages.
    // i.e. the |browser_|.
    content::PageNavigator* GetNavigator();
  
    // Returns the parent_.
    BrowserView* get_parent() { return parent_; }
  
    // views::View:
    gfx::Size CalculatePreferredSize() const override;
    void Layout() override;
    void ViewHierarchyChanged(
        const ViewHierarchyChangedDetails& details) override;
  
    // gfx::AnimationDelegate.
    void AnimationProgressed(const gfx::Animation* animation) override;
    void AnimationEnded(const gfx::Animation* animation) override;
  
    // views::LinkListener.
    // Invoked when the user clicks the 'show all downloads' link button.
    void LinkClicked(views::Link* source, int event_flags) override;
  
    // views::ButtonListener:
    // Invoked when the user clicks the close button. Asks the browser to
    // hide the download shelf.
    void ButtonPressed(views::Button* button, const ui::Event& event) override;
  
    // DownloadShelf:
    bool IsShowing() const override;
    bool IsClosing() const override;
    Browser* browser() const override;
  
    // views::MouseWatcherListener:
    void MouseMovedOutOfHost() override;
  
    // Removes a specified download view. The supplied view is deleted after
    // it's removed.
    void RemoveDownloadView(views::View* view);
  
    // Updates |button| according to the active theme.
    void ConfigureButtonForTheme(views::MdTextButton* button);
  
   protected:
    // DownloadShelf:
    void DoAddDownload(download::DownloadItem* download) override;
    void DoOpen() override;
    void DoClose(CloseReason reason) override;
    void DoHide() override;
    void DoUnhide() override;
  
    // views::AccessiblePaneView:
    views::View* GetDefaultFocusableChild() override;
  
   private:
    // Adds a View representing a download to this DownloadShelfView.
    // DownloadShelfView takes ownership of the View, and will delete it as
    // necessary.
    void AddDownloadView(DownloadItemView* view);
  
    // Paints the border.
    void OnPaintBorder(gfx::Canvas* canvas) override;
  
    // Returns true if the shelf is wide enough to show the first download item.
    bool CanFitFirstDownloadItem();
  
    // Called on theme change.
    void UpdateColorsFromTheme();
  
    // views::View:
    void OnThemeChanged() override;
  
    // Called when the "close shelf" animation ended.
    void Closed();
  
    // Returns true if we can auto close. We can auto-close if all the items on
    // the shelf have been opened.
    bool CanAutoClose();
  
    // Returns the color of text for the shelf (used for deriving icon color).
    SkColor GetTextColorForIconMd();
  
    // The browser for this shelf.
    Browser* const browser_;
  
    // The animation for adding new items to the shelf.
    gfx::SlideAnimation new_item_animation_;
  
    // The show/hide animation for the shelf itself.
    gfx::SlideAnimation shelf_animation_;
  
    // The download views. These are also child Views, and deleted when
    // the DownloadShelfView is deleted.
    std::vector<DownloadItemView*> download_views_;
  
    // Button for showing all downloads (chrome://downloads).
    views::MdTextButton* show_all_view_;
  
    // Button for closing the downloads. This is contained as a child, and
    // deleted by View.
    views::ImageButton* close_button_;
  
    // Hidden view that will contain status text for immediate output by
    // screen readers.
    views::View* accessible_alert_;
  
    // The window this shelf belongs to.
    BrowserView* parent_;
  
    views::MouseWatcher mouse_watcher_;
  
    DISALLOW_COPY_AND_ASSIGN(DownloadShelfView);
  };
  
  #endif  // CHROME_BROWSER_UI_VIEWS_DOWNLOAD_DOWNLOAD_SHELF_VIEW_H_
  