Revert 98434 - Adding a Views scrollbar implementation.

views/controls/scrollbar/base_scroll_bar_thumb.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "views/controls/scrollbar/base_scroll_bar_thumb.h"
-
-#include "views/controls/scrollbar/base_scroll_bar.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/rect.h"
-
-namespace {
-// The distance the mouse can be dragged outside the bounds of the thumb during
-// dragging before the scrollbar will snap back to its regular position.
-static const int kScrollThumbDragOutSnap = 100;
-}
-
-namespace views {
-
-BaseScrollBarThumb::BaseScrollBarThumb(BaseScrollBar* scroll_bar)
-    : scroll_bar_(scroll_bar),
-      drag_start_position_(-1),
-      mouse_offset_(-1),
-      state_(CustomButton::BS_NORMAL) {
-}
-
-BaseScrollBarThumb::~BaseScrollBarThumb() {
-}
-
-void BaseScrollBarThumb::SetSize(int size) {
-  // Make sure the thumb is never sized smaller than its minimum possible
-  // display size.
-  gfx::Size prefsize = GetPreferredSize();
-  size = std::max(size, scroll_bar_->IsHorizontal() ? prefsize.width() :
-                                                      prefsize.height());
-  gfx::Rect thumb_bounds = bounds();
-  if (scroll_bar_->IsHorizontal()) {
-    thumb_bounds.set_width(size);
-  } else {
-    thumb_bounds.set_height(size);
-  }
-  SetBoundsRect(thumb_bounds);
-}
-
-int BaseScrollBarThumb::GetSize() const {
-  if (scroll_bar_->IsHorizontal())
-    return width();
-  return height();
-}
-
-void BaseScrollBarThumb::SetPosition(int position) {
-  gfx::Rect thumb_bounds = bounds();
-  gfx::Rect track_bounds = scroll_bar_->GetTrackBounds();
-  if (scroll_bar_->IsHorizontal()) {
-    thumb_bounds.set_x(track_bounds.x() + position);
-  } else {
-    thumb_bounds.set_y(track_bounds.y() + position);
-  }
-  SetBoundsRect(thumb_bounds);
-}
-
-int BaseScrollBarThumb::GetPosition() const {
-  gfx::Rect track_bounds = scroll_bar_->GetTrackBounds();
-  if (scroll_bar_->IsHorizontal())
-    return x() - track_bounds.x();
-  return y() - track_bounds.y();
-}
-
-void BaseScrollBarThumb::OnMouseEntered(const MouseEvent& event) {
-  SetState(CustomButton::BS_HOT);
-}
-
-void BaseScrollBarThumb::OnMouseExited(const MouseEvent& event) {
-  SetState(CustomButton::BS_NORMAL);
-}
-
-bool BaseScrollBarThumb::OnMousePressed(const MouseEvent& event) {
-  mouse_offset_ = scroll_bar_->IsHorizontal() ? event.x() : event.y();
-  drag_start_position_ = GetPosition();
-  SetState(CustomButton::BS_PUSHED);
-  return true;
-}
-
-bool BaseScrollBarThumb::OnMouseDragged(const MouseEvent& event) {
-  // If the user moves the mouse more than |kScrollThumbDragOutSnap| outside
-  // the bounds of the thumb, the scrollbar will snap the scroll back to the
-  // point it was at before the drag began.
-  if (scroll_bar_->IsHorizontal()) {
-    if ((event.y() < y() - kScrollThumbDragOutSnap) ||
-        (event.y() > (y() + height() + kScrollThumbDragOutSnap))) {
-      scroll_bar_->ScrollToThumbPosition(drag_start_position_, false);
-      return true;
-    }
-  } else {
-    if ((event.x() < x() - kScrollThumbDragOutSnap) ||
-        (event.x() > (x() + width() + kScrollThumbDragOutSnap))) {
-      scroll_bar_->ScrollToThumbPosition(drag_start_position_, false);
-      return true;
-    }
-  }
-  if (scroll_bar_->IsHorizontal()) {
-    int thumb_x = event.x() - mouse_offset_;
-    scroll_bar_->ScrollToThumbPosition(GetPosition() + thumb_x, false);
-  } else {
-    int thumb_y = event.y() - mouse_offset_;
-    scroll_bar_->ScrollToThumbPosition(GetPosition() + thumb_y, false);
-  }
-  return true;
-}
-
-void BaseScrollBarThumb::OnMouseReleased(const MouseEvent& event) {
-  OnMouseCaptureLost();
-}
-
-void BaseScrollBarThumb::OnMouseCaptureLost() {
-  SetState(CustomButton::BS_HOT);
-}
-
-CustomButton::ButtonState BaseScrollBarThumb::GetState() const {
-  return state_;
-}
-
-void BaseScrollBarThumb::SetState(CustomButton::ButtonState state) {
-  state_ = state;
-  SchedulePaint();
-}
-
-}  // namespace views