| // 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 |