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// Copyright 2016 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 <AppKit/AppKit.h>
#include "base/logging.h"
#include "ui/base/cocoa/defaults_utils.h"
namespace ui {
bool TextInsertionCaretBlinkPeriod(base::TimeDelta* delta) {
const int kMaximumReasonableIntervalMs = 60 * 1000;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// 10.10+
double on_period_ms = [defaults
doubleForKey:@"NSTextInsertionPointBlinkPeriodOn"];
double off_period_ms = [defaults
doubleForKey:@"NSTextInsertionPointBlinkPeriodOff"];
// 10.9
double period_ms = [defaults
doubleForKey:@"NSTextInsertionPointBlinkPeriod"];
if (on_period_ms == 0.0 && off_period_ms == 0.0 && period_ms == 0.0)
return false;
// Neither Blink nor Views support having separate on and off intervals, so
// this function takes the average. There's a special case: setting
// on_period_ms very high functions to permanently enable the cursor, which is
// what happens when the blink period in Blink/Views is set to 0. Setting
// off_period_ms very high would disable the cursor entirely, but Blink/Views
// do not support that so it's not implemented here.
if (on_period_ms > kMaximumReasonableIntervalMs ||
period_ms > kMaximumReasonableIntervalMs) {
*delta = base::TimeDelta();
} else if (on_period_ms || off_period_ms) {
*delta = base::TimeDelta::FromMillisecondsD(
(on_period_ms + off_period_ms) / 2);
} else {
*delta = base::TimeDelta::FromMilliseconds(period_ms);
}
return true;
}
} // namespace ui
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