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   if (details.is_add && !native_wrapper_ && GetWidget()) {
  61     native_wrapper_ = NativeScrollBarWrapper::CreateWrapper(this);
  62     AddChildView(native_wrapper_->GetView());
  63   }
  64 }
  65
  66 const char* NativeScrollBar::GetClassName() const {
  67   return kViewClassName;
  68 }
  69
  70 // Overridden from View for keyboard UI.
  71 bool NativeScrollBar::OnKeyPressed(const ui::KeyEvent& event) {
  72   if (!native_wrapper_)
  73     return false;
  74   return native_wrapper_->GetView()->OnKeyPressed(event);
  75 }
  76
  77 void NativeScrollBar::OnGestureEvent(ui::GestureEvent* event) {
  78   if (!native_wrapper_)
  79     return;
  80   native_wrapper_->GetView()->OnGestureEvent(event);
  81 }
  82
  83 bool NativeScrollBar::OnMouseWheel(const ui::MouseWheelEvent& event) {
  84   if (!native_wrapper_)
  85     return false;
  86   return native_wrapper_->GetView()->OnMouseWheel(event);
  87 }
  88
  89 ////////////////////////////////////////////////////////////////////////////////
  90 // NativeScrollBar, ScrollBar overrides:
  91 void NativeScrollBar::Update(int viewport_size,
  92                              int content_size,
  93                              int current_pos) {
  94   ScrollBar::Update(viewport_size, content_size, current_pos);
  95
  96   if (native_wrapper_)
  97     native_wrapper_->Update(viewport_size, content_size, current_pos);
  98 }
  99
 100 int NativeScrollBar::GetLayoutSize() const {
 101   return IsHorizontal() ?
 102       GetHorizontalScrollBarHeight(GetNativeTheme()) :
 103       GetVerticalScrollBarWidth(GetNativeTheme());
 104 }
 105
 106 int NativeScrollBar::GetPosition() const {
 107   if (!native_wrapper_)
 108     return 0;
 109   return native_wrapper_->GetPosition();
 110 }
 111
 112 }  // namespace views
 113