chrome/browser/ui/views/dropdown_bar_view.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_
   6 #define CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_
   7
   8 #include "chrome/browser/ui/views/dropdown_bar_host.h"
   9 #include "chrome/browser/ui/views/dropdown_bar_host_delegate.h"
  10 #include "ui/views/accessible_pane_view.h"
  11
  12 namespace gfx {
  13 class Canvas;
  14 class ImageSkia;
  15 }  // namespace gfx
  16
  17 ////////////////////////////////////////////////////////////////////////////////
  18 //
  19 // The DropdownBarView is an abstract view to draw the UI controls of the
  20 // DropdownBarHost.
  21 //
  22 ////////////////////////////////////////////////////////////////////////////////
  23 class DropdownBarView : public views::AccessiblePaneView,
  24                         public DropdownBarHostDelegate {
  25  public:
  26   explicit DropdownBarView(DropdownBarHost* host);
  27   ~DropdownBarView() override;
  28
  29   // Updates the view to let it know where the host is clipping the
  30   // dropdown widget (while animating the opening or closing of the widget).
  31   void SetAnimationOffset(int offset) override;
  32
  33   // Returns the offset used while animating.
  34   int animation_offset() const { return animation_offset_; }
  35
  36  protected:
  37   // views::View:
  38   void OnPaint(gfx::Canvas* canvas) override;
  39
  40   // Returns the DropdownBarHost that manages this view.
  41   DropdownBarHost* host() const { return host_; }
  42
  43   void SetBackground(const gfx::ImageSkia* left_alpha_mask,
  44                      const gfx::ImageSkia* right_alpha_mask);
  45   void SetBorderFromIds(int left_border_image_id,
  46                         int middle_border_image_id,
  47                         int right_border_image_id);
  48
  49  private:
  50   // The dropdown bar host that controls this view.
  51   DropdownBarHost* host_;
  52
  53   // While animating, the host clips the widget and draws only the bottom
  54   // part of it. The view needs to know the pixel offset at which we are drawing
  55   // the widget so that we can draw the curved edges that attach to the toolbar
  56   // in the right location.
  57   int animation_offset_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(DropdownBarView);
  60 };
  61 #endif  // CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_