ui/message_center/views/desktop_popup_alignment_delegate.cc

   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 #include "ui/message_center/views/desktop_popup_alignment_delegate.h"
   6
   7 #include "ui/gfx/display.h"
   8 #include "ui/gfx/geometry/rect.h"
   9 #include "ui/gfx/screen.h"
  10 #include "ui/message_center/message_center_style.h"
  11 #include "ui/message_center/views/message_popup_collection.h"
  12
  13 namespace message_center {
  14
  15 DesktopPopupAlignmentDelegate::DesktopPopupAlignmentDelegate()
  16     : alignment_(POPUP_ALIGNMENT_BOTTOM | POPUP_ALIGNMENT_RIGHT),
  17       display_id_(gfx::Display::kInvalidDisplayID),
  18       screen_(NULL) {
  19 }
  20
  21 DesktopPopupAlignmentDelegate::~DesktopPopupAlignmentDelegate() {
  22   if (screen_)
  23     screen_->RemoveObserver(this);
  24 }
  25
  26 void DesktopPopupAlignmentDelegate::StartObserving(gfx::Screen* screen) {
  27   if (screen_ || !screen)
  28     return;
  29
  30   screen_ = screen;
  31   screen_->AddObserver(this);
  32   gfx::Display display = screen_->GetPrimaryDisplay();
  33   display_id_ = display.id();
  34   RecomputeAlignment(display);
  35 }
  36
  37 int DesktopPopupAlignmentDelegate::GetToastOriginX(
  38     const gfx::Rect& toast_bounds) const {
  39   if (IsFromLeft())
  40     return work_area_.x() + kMarginBetweenItems;
  41   return work_area_.right() - kMarginBetweenItems - toast_bounds.width();
  42 }
  43
  44 int DesktopPopupAlignmentDelegate::GetBaseLine() const {
  45   return IsTopDown()
  46       ? work_area_.y() + kMarginBetweenItems
  47       : work_area_.bottom() - kMarginBetweenItems;
  48 }
  49
  50 int DesktopPopupAlignmentDelegate::GetWorkAreaBottom() const {
  51   return work_area_.bottom();
  52 }
  53
  54 bool DesktopPopupAlignmentDelegate::IsTopDown() const {
  55   return (alignment_ & POPUP_ALIGNMENT_TOP) != 0;
  56 }
  57
  58 bool DesktopPopupAlignmentDelegate::IsFromLeft() const {
  59   return (alignment_ & POPUP_ALIGNMENT_LEFT) != 0;
  60 }
  61
  62 void DesktopPopupAlignmentDelegate::RecomputeAlignment(
  63     const gfx::Display& display) {
  64   if (work_area_ == display.work_area())
  65     return;
  66
  67   work_area_ = display.work_area();
  68
  69   // If the taskbar is at the top, render notifications top down. Some platforms
  70   // like Gnome can have taskbars at top and bottom. In this case it's more
  71   // likely that the systray is on the top one.
  72   alignment_ = work_area_.y() > display.bounds().y() ? POPUP_ALIGNMENT_TOP
  73                                                      : POPUP_ALIGNMENT_BOTTOM;
  74
  75   // If the taskbar is on the left show the notifications on the left. Otherwise
  76   // show it on right since it's very likely that the systray is on the right if
  77   // the taskbar is on the top or bottom.
  78   // Since on some platforms like Ubuntu Unity there's also a launcher along
  79   // with a taskbar (panel), we need to check that there is really nothing at
  80   // the top before concluding that the taskbar is at the left.
  81   alignment_ |= (work_area_.x() > display.bounds().x() &&
  82                  work_area_.y() == display.bounds().y())
  83       ? POPUP_ALIGNMENT_LEFT
  84       : POPUP_ALIGNMENT_RIGHT;
  85 }
  86
  87 void DesktopPopupAlignmentDelegate::OnDisplayAdded(
  88     const gfx::Display& new_display) {
  89 }
  90
  91 void DesktopPopupAlignmentDelegate::OnDisplayRemoved(
  92     const gfx::Display& old_display) {
  93 }
  94
  95 void DesktopPopupAlignmentDelegate::OnDisplayMetricsChanged(
  96     const gfx::Display& display,
  97     uint32_t metrics) {
  98   if (display.id() == display_id_) {
  99     RecomputeAlignment(display);
 100     DoUpdateIfPossible();
 101   }
 102 }
 103
 104 }  // namespace message_center