Reland: Move TouchSelectionController from content to ui

ui/base/touch/selection_bound.cc

Index: ui/base/touch/selection_bound.cc
diff --git a/ui/base/touch/selection_bound.cc b/ui/base/touch/selection_bound.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3f4cc2db09eb9cc2150c0d4b78929507b971699f
--- /dev/null
+++ b/ui/base/touch/selection_bound.cc
@@ -0,0 +1,94 @@
+// Copyright 2014 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 <algorithm>
+
+#include "base/macros.h"
+#include "ui/base/touch/selection_bound.h"
+#include "ui/gfx/geometry/point_conversions.h"
+
+namespace ui {
+
+namespace {
+
+SelectionBound::Type ConvertToSelectionBoundType(cc::SelectionBoundType type) {
+  switch (type) {
+    case cc::SELECTION_BOUND_LEFT:
+      return SelectionBound::LEFT;
+    case cc::SELECTION_BOUND_RIGHT:
+      return SelectionBound::RIGHT;
+    case cc::SELECTION_BOUND_CENTER:
+      return SelectionBound::CENTER;
+    case cc::SELECTION_BOUND_EMPTY:
+      return SelectionBound::EMPTY;
+  }
+  NOTREACHED() << "Unknown selection bound type";
+  return SelectionBound::EMPTY;
+}
+
+}  // namespace
+
+SelectionBound::SelectionBound() : type_(EMPTY), visible_(false) {
+}
+
+SelectionBound::SelectionBound(const cc::ViewportSelectionBound& bound)
+    : type_(ConvertToSelectionBoundType(bound.type)),
+      visible_(bound.visible) {
+  SetEdgeTop(bound.edge_top);

[jdduke (slow), 2014/12/01 20:38:04]

Let's skip these setters if the bound is empty, as this will be called every
frame.

[mohsen, 2014/12/02 05:17:02]

Done.

+  SetEdgeBottom(bound.edge_bottom);
+}
+
+SelectionBound::~SelectionBound() {
+}
+
+void SelectionBound::SetEdgeTop(const gfx::PointF& value) {
+  edge_top_ = value;
+  edge_top_rounded_ = gfx::ToRoundedPoint(value);
+}
+
+void SelectionBound::SetEdgeBottom(const gfx::PointF& value) {
+  edge_bottom_ = value;
+  edge_bottom_rounded_ = gfx::ToRoundedPoint(value);
+}
+
+int SelectionBound::GetHeight() const {
+  return edge_bottom_rounded_.y() - edge_top_rounded_.y();
+}
+
+bool operator==(const SelectionBound& lhs, const SelectionBound& rhs) {
+  return lhs.type() == rhs.type() && lhs.visible() == rhs.visible() &&
+         lhs.edge_top() == rhs.edge_top() &&
+         lhs.edge_bottom() == rhs.edge_bottom();
+}
+
+bool operator!=(const SelectionBound& lhs, const SelectionBound& rhs) {
+  return !(lhs == rhs);
+}
+
+gfx::Rect RectBetweenSelectionBounds(const SelectionBound& b1,
+                                     const SelectionBound& b2) {
+  int all_x[] = {
+    b1.edge_top_rounded().x(),

[jdduke (slow), 2014/12/01 20:38:04]

Hmm, it may not be any better, but what about:

gfx::Point p0(b1.edge_top_rounded());
p0.SetToMin(b1.edge_bottom_rounded());
p0.SetToMin(b2.edge_top_rounded()):
p0.SetToMin(b2.edge_top_rounded());

gfx::Point p1(...);
p1.SetToMax(...);
...

return gfx::Rect(p0, p1 - p0);

[mohsen, 2014/12/02 05:17:02]

Done, although, I wish we could do this:
return gfx::UnionRects(
    gfx::BoundingRect(b1.edge_top_rounded(), b1.edge_bottom_rounded()),
    gfx::BoundingRect(b2.edge_top_rounded(), b2.edge_bottom_rounded()));

+    b2.edge_top_rounded().x(),
+    b1.edge_bottom_rounded().x(),
+    b2.edge_bottom_rounded().x()
+  };
+  int all_y[] = {
+      b1.edge_top_rounded().y(),
+      b2.edge_top_rounded().y(),
+      b1.edge_bottom_rounded().y(),
+      b2.edge_bottom_rounded().y()
+  };
+  const int num_elements = arraysize(all_x);
+  COMPILE_ASSERT(arraysize(all_y) == num_elements, array_size_mismatch);
+
+  int left = *std::min_element(all_x, all_x + num_elements);
+  int top = *std::min_element(all_y, all_y + num_elements);
+  int right = *std::max_element(all_x, all_x + num_elements);
+  int bottom = *std::max_element(all_y, all_y + num_elements);
+
+  return gfx::Rect(left, top, right - left, bottom - top);
+}
+
+}  // namespace ui