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// 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 "chrome/browser/tabs/tab_strip_selection_model.h"
#include <algorithm>
#include <valarray>
#include "base/logging.h"
// static
const int TabStripSelectionModel::kUnselectedIndex = -1;
static void IncrementFromImpl(int index, int* value) {
if (*value >= index)
(*value)++;
}
static bool DecrementFromImpl(int index, int* value) {
if (*value == index) {
*value = TabStripSelectionModel::kUnselectedIndex;
return true;
}
if (*value > index)
(*value)--;
return false;
}
TabStripSelectionModel::TabStripSelectionModel()
: active_(kUnselectedIndex),
anchor_(kUnselectedIndex) {
}
TabStripSelectionModel::~TabStripSelectionModel() {
}
void TabStripSelectionModel::IncrementFrom(int index) {
// Shift the selection to account for the newly inserted tab.
for (SelectedIndices::iterator i = selected_indices_.begin();
i != selected_indices_.end(); ++i) {
IncrementFromImpl(index, &(*i));
}
IncrementFromImpl(index, &anchor_);
IncrementFromImpl(index, &active_);
}
void TabStripSelectionModel::DecrementFrom(int index) {
for (SelectedIndices::iterator i = selected_indices_.begin();
i != selected_indices_.end(); ) {
if (DecrementFromImpl(index, &(*i)))
i = selected_indices_.erase(i);
else
++i;
}
DecrementFromImpl(index, &anchor_);
DecrementFromImpl(index, &active_);
}
void TabStripSelectionModel::SetSelectedIndex(int index) {
anchor_ = active_ = index;
SetSelectionFromAnchorTo(index);
}
bool TabStripSelectionModel::IsSelected(int index) const {
return std::find(selected_indices_.begin(), selected_indices_.end(), index) !=
selected_indices_.end();
}
void TabStripSelectionModel::AddIndexToSelection(int index) {
if (!IsSelected(index)) {
selected_indices_.push_back(index);
std::sort(selected_indices_.begin(), selected_indices_.end());
}
}
void TabStripSelectionModel::RemoveIndexFromSelection(int index) {
SelectedIndices::iterator i = std::find(selected_indices_.begin(),
selected_indices_.end(), index);
if (i != selected_indices_.end())
selected_indices_.erase(i);
}
void TabStripSelectionModel::SetSelectionFromAnchorTo(int index) {
if (anchor_ == kUnselectedIndex) {
SetSelectedIndex(index);
} else {
int delta = std::abs(index - anchor_);
SelectedIndices new_selection(delta + 1, 0);
for (int i = 0, min = std::min(index, anchor_); i <= delta; ++i)
new_selection[i] = i + min;
selected_indices_.swap(new_selection);
active_ = index;
}
}
void TabStripSelectionModel::AddSelectionFromAnchorTo(int index) {
if (anchor_ == kUnselectedIndex) {
SetSelectedIndex(index);
} else {
for (int i = std::min(index, anchor_), end = std::max(index, anchor_);
i <= end; ++i) {
if (!IsSelected(i))
selected_indices_.push_back(i);
}
std::sort(selected_indices_.begin(), selected_indices_.end());
active_ = index;
}
}
void TabStripSelectionModel::Move(int from, int to) {
DCHECK_NE(to, from);
bool was_anchor = from == anchor_;
bool was_active = from == active_;
bool was_selected = IsSelected(from);
if (to < from) {
IncrementFrom(to);
DecrementFrom(from + 1);
} else {
DecrementFrom(from);
IncrementFrom(to);
}
if (was_active)
active_ = to;
if (was_anchor)
anchor_ = to;
if (was_selected)
AddIndexToSelection(to);
}
void TabStripSelectionModel::Clear() {
anchor_ = active_ = kUnselectedIndex;
SelectedIndices empty_selection;
selected_indices_.swap(empty_selection);
}
void TabStripSelectionModel::Copy(const TabStripSelectionModel& source) {
selected_indices_ = source.selected_indices_;
active_ = source.active_;
anchor_ = source.anchor_;
}
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