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// 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.
#import "ui/views/cocoa/cocoa_mouse_capture.h"
#import <Cocoa/Cocoa.h>
#include "base/logging.h"
#import "ui/views/cocoa/cocoa_mouse_capture_delegate.h"
namespace views {
// The ActiveEventTap is a RAII handle on the resources being used to capture
// events. There is either 0 or 1 active instance of this class. If a second
// instance is created, it will destroy the other instance before returning from
// its constructor.
class CocoaMouseCapture::ActiveEventTap {
public:
explicit ActiveEventTap(CocoaMouseCapture* owner);
~ActiveEventTap();
void Init();
private:
// The currently active event tap, or null if there is none.
static ActiveEventTap* g_active_event_tap;
CocoaMouseCapture* owner_; // Weak. Owns this.
id local_monitor_;
id global_monitor_;
DISALLOW_COPY_AND_ASSIGN(ActiveEventTap);
};
CocoaMouseCapture::ActiveEventTap*
CocoaMouseCapture::ActiveEventTap::g_active_event_tap = nullptr;
CocoaMouseCapture::ActiveEventTap::ActiveEventTap(CocoaMouseCapture* owner)
: owner_(owner), local_monitor_(nil), global_monitor_(nil) {
if (g_active_event_tap)
g_active_event_tap->owner_->OnOtherClientGotCapture();
DCHECK(!g_active_event_tap);
g_active_event_tap = this;
}
CocoaMouseCapture::ActiveEventTap::~ActiveEventTap() {
DCHECK_EQ(g_active_event_tap, this);
[NSEvent removeMonitor:global_monitor_];
[NSEvent removeMonitor:local_monitor_];
g_active_event_tap = nullptr;
owner_->delegate_->OnMouseCaptureLost();
}
void CocoaMouseCapture::ActiveEventTap::Init() {
NSEventMask event_mask =
NSLeftMouseDownMask | NSLeftMouseUpMask | NSRightMouseDownMask |
NSRightMouseUpMask | NSMouseMovedMask | NSLeftMouseDraggedMask |
NSRightMouseDraggedMask | NSMouseEnteredMask | NSMouseExitedMask |
NSScrollWheelMask | NSOtherMouseDownMask | NSOtherMouseUpMask |
NSOtherMouseDraggedMask;
local_monitor_ = [NSEvent addLocalMonitorForEventsMatchingMask:event_mask
handler:^NSEvent*(NSEvent* event) {
owner_->delegate_->PostCapturedEvent(event);
return nil; // Swallow all local events.
}];
global_monitor_ = [NSEvent addGlobalMonitorForEventsMatchingMask:event_mask
handler:^void(NSEvent* event) {
owner_->delegate_->PostCapturedEvent(event);
}];
}
CocoaMouseCapture::CocoaMouseCapture(CocoaMouseCaptureDelegate* delegate)
: delegate_(delegate), active_handle_(new ActiveEventTap(this)) {
active_handle_->Init();
}
CocoaMouseCapture::~CocoaMouseCapture() {
}
void CocoaMouseCapture::OnOtherClientGotCapture() {
DCHECK(active_handle_);
active_handle_.reset();
}
} // namespace views
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