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// Copyright (c) 2009 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 "chrome/browser/cocoa/clickhold_button_cell.h"
#include "base/logging.h"
// Minimum and maximum click-hold timeout.
static const NSTimeInterval kMinTimeout = 0.0;
static const NSTimeInterval kMaxTimeout = 5.0;
// Drag distance threshold to activate click-hold; should be >= 0.
static const CGFloat kDragDistThreshold = 2.5;
// See |-resetToDefaults| (and header file) for other default values.
@interface ClickHoldButtonCell (Private)
- (void)resetToDefaults;
@end // @interface ClickHoldButtonCell (Private)
@implementation ClickHoldButtonCell
// Overrides:
+ (BOOL)prefersTrackingUntilMouseUp {
return NO;
}
- (id)init {
if ((self = [super init]))
[self resetToDefaults];
return self;
}
- (id)initWithCoder:(NSCoder*)decoder {
if ((self = [super initWithCoder:decoder]))
[self resetToDefaults];
return self;
}
- (id)initImageCell:(NSImage*)image {
if ((self = [super initImageCell:image]))
[self resetToDefaults];
return self;
}
- (id)initTextCell:(NSString*)string {
if ((self = [super initTextCell:string]))
[self resetToDefaults];
return self;
}
- (BOOL)startTrackingAt:(NSPoint)startPoint
inView:(NSView*)controlView {
return enableClickHold_ ? YES :
[super startTrackingAt:startPoint
inView:controlView];
}
- (BOOL)continueTracking:(NSPoint)lastPoint
at:(NSPoint)currentPoint
inView:(NSView*)controlView {
return enableClickHold_ ? YES :
[super continueTracking:lastPoint
at:currentPoint
inView:controlView];
}
- (BOOL)trackMouse:(NSEvent*)originalEvent
inRect:(NSRect)cellFrame
ofView:(NSView*)controlView
untilMouseUp:(BOOL)untilMouseUp {
if (!enableClickHold_) {
return [super trackMouse:originalEvent
inRect:cellFrame
ofView:controlView
untilMouseUp:untilMouseUp];
}
// If doing click-hold, track the mouse ourselves.
NSPoint currPoint = [controlView convertPoint:[originalEvent locationInWindow]
fromView:nil];
NSPoint lastPoint = currPoint;
NSPoint firstPoint = currPoint;
NSTimeInterval timeout =
MAX(MIN(clickHoldTimeout_, kMaxTimeout), kMinTimeout);
NSDate* clickHoldBailTime = [NSDate dateWithTimeIntervalSinceNow:timeout];
if (![self startTrackingAt:currPoint inView:controlView])
return NO;
enum {
kContinueTrack, kStopClickHold, kStopMouseUp, kStopLeftRect, kStopNoContinue
} state = kContinueTrack;
do {
NSEvent* event = [NSApp nextEventMatchingMask:(NSLeftMouseDraggedMask |
NSLeftMouseUpMask)
untilDate:clickHoldBailTime
inMode:NSEventTrackingRunLoopMode
dequeue:YES];
currPoint = [controlView convertPoint:[event locationInWindow]
fromView:nil];
// Time-out.
if (!event) {
state = kStopClickHold;
// Drag? (If distance meets threshold.)
} else if (activateOnDrag_ && ([event type] == NSLeftMouseDragged)) {
CGFloat dx = currPoint.x - firstPoint.x;
CGFloat dy = currPoint.y - firstPoint.y;
if ((dx*dx + dy*dy) >= (kDragDistThreshold*kDragDistThreshold))
state = kStopClickHold;
// Mouse up.
} else if ([event type] == NSLeftMouseUp) {
state = kStopMouseUp;
// Stop tracking if mouse left frame rectangle (if requested to do so).
} else if (trackOnlyInRect_ && ![controlView mouse:currPoint
inRect:cellFrame]) {
state = kStopLeftRect;
// Stop tracking if instructed to.
} else if (![self continueTracking:lastPoint
at:currPoint
inView:controlView]) {
state = kStopNoContinue;
}
lastPoint = currPoint;
} while (state == kContinueTrack);
[self stopTracking:lastPoint
at:lastPoint
inView:controlView
mouseIsUp:NO];
switch (state) {
case kStopClickHold:
if (clickHoldAction_) {
[static_cast<NSControl*>(controlView) sendAction:clickHoldAction_
to:clickHoldTarget_];
}
return YES;
case kStopMouseUp:
if ([self action]) {
[static_cast<NSControl*>(controlView) sendAction:[self action]
to:[self target]];
}
return YES;
case kStopLeftRect:
case kStopNoContinue:
return NO;
default:
NOTREACHED() << "Unknown terminating state!";
}
return NO;
}
// Accessors and mutators:
@synthesize enableClickHold = enableClickHold_;
@synthesize clickHoldTimeout = clickHoldTimeout_;
@synthesize trackOnlyInRect = trackOnlyInRect_;
@synthesize activateOnDrag = activateOnDrag_;
@synthesize clickHoldTarget = clickHoldTarget_;
@synthesize clickHoldAction = clickHoldAction_;
@end // @implementation ClickHoldButtonCell
@implementation ClickHoldButtonCell (Private)
// Resets various members to defaults indicated in the header file. (Those
// without indicated defaults are *not* touched.) Please keep the values below
// in sync with the header file, and please be aware of side-effects on code
// which relies on the "published" defaults.
- (void)resetToDefaults {
[self setEnableClickHold:NO];
[self setClickHoldTimeout:0.25];
[self setTrackOnlyInRect:NO];
[self setActivateOnDrag:YES];
}
@end // @implementation ClickHoldButtonCell (Private)
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