components/infobars/core/infobar_container.h

   1 // Copyright 2014 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 COMPONENTS_INFOBARS_CORE_INFOBAR_CONTAINER_H_
   6 #define COMPONENTS_INFOBARS_CORE_INFOBAR_CONTAINER_H_
   7
   8 #include <vector>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/time/time.h"
  12 #include "components/infobars/core/infobar_manager.h"
  13 #include "third_party/skia/include/core/SkColor.h"
  14
  15 namespace infobars {
  16
  17 class InfoBar;
  18
  19 // InfoBarContainer is a cross-platform base class to handle the visibility-
  20 // related aspects of InfoBars.  While InfoBarManager owns the InfoBars, the
  21 // InfoBarContainer is responsible for telling particular InfoBars that they
  22 // should be hidden or visible.
  23 //
  24 // Platforms need to subclass this to implement a few platform-specific
  25 // functions, which are pure virtual here.
  26 class InfoBarContainer : public InfoBarManager::Observer {
  27  public:
  28   class Delegate {
  29    public:
  30     // The separator color may vary depending on where the container is hosted.
  31     virtual SkColor GetInfoBarSeparatorColor() const = 0;
  32
  33     // The delegate is notified each time the infobar container changes height,
  34     // as well as when it stops animating.
  35     virtual void InfoBarContainerStateChanged(bool is_animating) = 0;
  36
  37     // The delegate needs to tell us whether "unspoofable" arrows should be
  38     // drawn, and if so, at what |x| coordinate.  |x| may be NULL.
  39     virtual bool DrawInfoBarArrows(int* x) const = 0;
  40
  41    protected:
  42     virtual ~Delegate();
  43   };
  44
  45   explicit InfoBarContainer(Delegate* delegate);
  46   virtual ~InfoBarContainer();
  47
  48   // Changes the InfoBarManager for which this container is showing infobars.
  49   // This will hide all current infobars, remove them from the container, add
  50   // the infobars from |infobar_manager|, and show them all.  |infobar_manager|
  51   // may be NULL.
  52   void ChangeInfoBarManager(InfoBarManager* infobar_manager);
  53
  54   // Returns the amount by which to overlap the toolbar above, and, when
  55   // |total_height| is non-NULL, set it to the height of the InfoBarContainer
  56   // (including overlap).
  57   int GetVerticalOverlap(int* total_height) const;
  58
  59   // Called by the delegate when the distance between what the top infobar's
  60   // "unspoofable" arrow would point to and the top infobar itself changes.
  61   // This enables the top infobar to show a longer arrow (e.g. because of a
  62   // visible bookmark bar) or shorter (e.g. due to being in a popup window) if
  63   // desired.
  64   //
  65   // IMPORTANT: This MUST NOT result in a call back to
  66   // Delegate::InfoBarContainerStateChanged() unless it causes an actual
  67   // change, lest we infinitely recurse.
  68   void SetMaxTopArrowHeight(int height);
  69
  70   // Called when a contained infobar has animated or by some other means changed
  71   // its height, or when it stops animating.  The container is expected to do
  72   // anything necessary to respond, e.g. re-layout.
  73   void OnInfoBarStateChanged(bool is_animating);
  74
  75   // Called by |infobar| to request that it be removed from the container.  At
  76   // this point, |infobar| should already be hidden.
  77   void RemoveInfoBar(InfoBar* infobar);
  78
  79   const Delegate* delegate() const { return delegate_; }
  80
  81  protected:
  82   // Subclasses must call this during destruction, so that we can remove
  83   // infobars (which will call the pure virtual functions below) while the
  84   // subclass portion of |this| has not yet been destroyed.
  85   void RemoveAllInfoBarsForDestruction();
  86
  87   // These must be implemented on each platform to e.g. adjust the visible
  88   // object hierarchy.  The first two functions should each be called exactly
  89   // once during an infobar's life (see comments on RemoveInfoBar() and
  90   // AddInfoBar()).
  91   virtual void PlatformSpecificAddInfoBar(InfoBar* infobar,
  92                                           size_t position) = 0;
  93   // TODO(miguelg): Remove this; it is only necessary for Android, and only
  94   // until the translate infobar is implemented as three different infobars like
  95   // GTK does.
  96   virtual void PlatformSpecificReplaceInfoBar(InfoBar* old_infobar,
  97                                               InfoBar* new_infobar) {}
  98   virtual void PlatformSpecificRemoveInfoBar(InfoBar* infobar) = 0;
  99   virtual void PlatformSpecificInfoBarStateChanged(bool is_animating) {}
 100
 101  private:
 102   typedef std::vector<InfoBar*> InfoBars;
 103
 104   // InfoBarManager::Observer:
 105   void OnInfoBarAdded(InfoBar* infobar) override;
 106   void OnInfoBarRemoved(InfoBar* infobar, bool animate) override;
 107   void OnInfoBarReplaced(InfoBar* old_infobar, InfoBar* new_infobar) override;
 108   void OnManagerShuttingDown(InfoBarManager* manager) override;
 109
 110   // Adds |infobar| to this container before the existing infobar at position
 111   // |position| and calls Show() on it.  |animate| is passed along to
 112   // infobar->Show().  Depending on the value of |callback_status|, this calls
 113   // infobar->set_container(this) either before or after the call to Show() so
 114   // that OnInfoBarStateChanged() either will or won't be called as a result.
 115   enum CallbackStatus { NO_CALLBACK, WANT_CALLBACK };
 116   void AddInfoBar(InfoBar* infobar,
 117                   size_t position,
 118                   bool animate,
 119                   CallbackStatus callback_status);
 120
 121   void UpdateInfoBarArrowTargetHeights();
 122   int ArrowTargetHeightForInfoBar(size_t infobar_index) const;
 123
 124   Delegate* delegate_;
 125   InfoBarManager* infobar_manager_;
 126   InfoBars infobars_;
 127
 128   // Calculated in SetMaxTopArrowHeight().
 129   int top_arrow_target_height_;
 130
 131   DISALLOW_COPY_AND_ASSIGN(InfoBarContainer);
 132 };
 133
 134 }  // namespace infobars
 135
 136 #endif  // COMPONENTS_INFOBARS_CORE_INFOBAR_CONTAINER_H_