ui/views/controls/scrollbar/native_scroll_bar.cc

   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 #include "ui/views/controls/scrollbar/native_scroll_bar.h"
   6
   7 #include <algorithm>
   8 #include <string>
   9
  10 #include "base/message_loop/message_loop.h"
  11 #include "ui/events/event.h"
  12 #include "ui/views/controls/scrollbar/native_scroll_bar_views.h"
  13 #include "ui/views/controls/scrollbar/native_scroll_bar_wrapper.h"
  14 #include "ui/views/widget/widget.h"
  15
  16 namespace views {
  17
  18 // static
  19 const char NativeScrollBar::kViewClassName[] = "NativeScrollBar";
  20
  21 ////////////////////////////////////////////////////////////////////////////////
  22 // NativeScrollBar, public:
  23 NativeScrollBar::NativeScrollBar(bool is_horizontal)
  24     : ScrollBar(is_horizontal),
  25       native_wrapper_(NULL) {
  26 }
  27
  28 NativeScrollBar::~NativeScrollBar() {
  29 }
  30
  31 // static
  32 int NativeScrollBar::GetHorizontalScrollBarHeight(
  33     const ui::NativeTheme* theme) {
  34   return NativeScrollBarWrapper::GetHorizontalScrollBarHeight(theme);
  35 }
  36
  37 // static
  38 int NativeScrollBar::GetVerticalScrollBarWidth(
  39     const ui::NativeTheme* theme) {
  40   return NativeScrollBarWrapper::GetVerticalScrollBarWidth(theme);
  41 }
  42
  43 ////////////////////////////////////////////////////////////////////////////////
  44 // NativeScrollBar, View overrides:
  45 gfx::Size NativeScrollBar::GetPreferredSize() const {
  46   if (native_wrapper_)
  47     return native_wrapper_->GetView()->GetPreferredSize();
  48   return gfx::Size();
  49 }
  50
  51 void NativeScrollBar::Layout() {
  52   if (native_wrapper_) {
  53     native_wrapper_->GetView()->SetBounds(0, 0, width(), height());
  54     native_wrapper_->GetView()->Layout();
  55   }
  56 }
  57
  58 void NativeScrollBar::ViewHierarchyChanged(
  59     const ViewHierarchyChangedDetails& details) {
  60   Widget* widget;
  61   if (details.is_add && !native_wrapper_ && (widget = GetWidget())) {
  62     native_wrapper_ = NativeScrollBarWrapper::CreateWrapper(this);
  63     AddChildView(native_wrapper_->GetView());
  64   }
  65 }
  66
  67 const char* NativeScrollBar::GetClassName() const {
  68   return kViewClassName;
  69 }
  70
  71 // Overridden from View for keyboard UI.
  72 bool NativeScrollBar::OnKeyPressed(const ui::KeyEvent& event) {
  73   if (!native_wrapper_)
  74     return false;
  75   return native_wrapper_->GetView()->OnKeyPressed(event);
  76 }
  77
  78 void NativeScrollBar::OnGestureEvent(ui::GestureEvent* event) {
  79   if (!native_wrapper_)
  80     return;
  81   native_wrapper_->GetView()->OnGestureEvent(event);
  82 }
  83
  84 bool NativeScrollBar::OnMouseWheel(const ui::MouseWheelEvent& event) {
  85   if (!native_wrapper_)
  86     return false;
  87   return native_wrapper_->GetView()->OnMouseWheel(event);
  88 }
  89
  90 ////////////////////////////////////////////////////////////////////////////////
  91 // NativeScrollBar, ScrollBar overrides:
  92 void NativeScrollBar::Update(int viewport_size,
  93                              int content_size,
  94                              int current_pos) {
  95   ScrollBar::Update(viewport_size, content_size, current_pos);
  96
  97   if (native_wrapper_)
  98     native_wrapper_->Update(viewport_size, content_size, current_pos);
  99 }
 100
 101 int NativeScrollBar::GetLayoutSize() const {
 102   return IsHorizontal() ?
 103       GetHorizontalScrollBarHeight(GetNativeTheme()) :
 104       GetVerticalScrollBarWidth(GetNativeTheme());
 105 }
 106
 107 int NativeScrollBar::GetPosition() const {
 108   if (!native_wrapper_)
 109     return 0;
 110   return native_wrapper_->GetPosition();
 111 }
 112
 113 }  // namespace views
 114