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// Copyright 2013 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 "ash/shelf/shelf_navigator.h"
#include "ash/shelf/shelf_model.h"
namespace ash {
namespace {
// Returns true if accelerator processing should skip the shelf item with the
// specified type.
bool ShouldSkip(ShelfItemType type) {
return type == TYPE_APP_LIST ||
type == TYPE_BROWSER_SHORTCUT ||
type == TYPE_APP_SHORTCUT ||
type == TYPE_WINDOWED_APP;
}
} // namespace
int GetNextActivatedItemIndex(const ShelfModel& model,
CycleDirection direction) {
const ShelfItems& items = model.items();
int item_count = model.item_count();
int current_index = -1;
int first_running = -1;
for (int i = 0; i < item_count; ++i) {
const ShelfItem& item = items[i];
if (ShouldSkip(item.type))
continue;
if (item.status == STATUS_RUNNING && first_running < 0)
first_running = i;
if (item.status == STATUS_ACTIVE) {
current_index = i;
break;
}
}
// If nothing is active, try to active the first running item.
if (current_index < 0) {
if (first_running >= 0)
return first_running;
else
return -1;
}
int step = (direction == CYCLE_FORWARD) ? 1 : -1;
// Find the next item and activate it.
for (int i = (current_index + step + item_count) % item_count;
i != current_index; i = (i + step + item_count) % item_count) {
const ShelfItem& item = items[i];
if (ShouldSkip(item.type))
continue;
// Skip already active item.
if (item.status == STATUS_ACTIVE)
continue;
return i;
}
return -1;
}
} // namespace ash
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