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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 "base/scoped_nsobject.h"
#import "chrome/browser/cocoa/bookmark_button.h"
NSString* kBookmarkButtonDragType = @"ChromiumBookmarkButtonDragType";
// http://codereview.chromium.org/180036/diff/3001/3004
namespace {
const CGFloat kWebDragStartHysteresisX = 5.0;
const CGFloat kWebDragStartHysteresisY = 5.0;
}
@implementation BookmarkButton
@synthesize draggable = draggable_;
- (id)initWithFrame:(NSRect)frame {
if ((self = [super initWithFrame:frame])) {
draggable_ = YES;
}
return self;
}
// By default, NSButton ignores middle-clicks.
- (void)otherMouseUp:(NSEvent*)event {
[self performClick:self];
}
- (void)beginDrag:(NSEvent*)event {
NSSize dragOffset = NSMakeSize(0.0, 0.0);
NSPasteboard* pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
[pboard declareTypes:[NSArray arrayWithObject:kBookmarkButtonDragType]
owner:self];
// This NSData is no longer referenced once the function ends so
// there is no need to retain/release when placing in here as an
// opaque pointer.
[pboard setData:[NSData dataWithBytes:&self length:sizeof(self)]
forType:kBookmarkButtonDragType];
// This won't work if the source view is clipped. Fortunately, we
// don't display clipped bookmark buttons.
[[self superview] lockFocus];
scoped_nsobject<NSBitmapImageRep>
bitmapImage([[NSBitmapImageRep alloc]
initWithFocusedViewRect:[self frame]]);
[[self superview] unlockFocus];
scoped_nsobject<NSImage> imageDrag([[NSImage alloc]
initWithSize:[bitmapImage size]]);
[imageDrag addRepresentation:bitmapImage];
// At the moment, moving bookmarks causes their buttons (like me!)
// to be destroyed and rebuilt. Make sure we don't go away while on
// the stack.
[self retain];
CGFloat yAt = [self bounds].size.height;
[self dragImage:imageDrag at:NSMakePoint(0, yAt) offset:dragOffset
event:event pasteboard:pboard source:self slideBack:YES];
// And we're done.
[self autorelease];
}
- (void)draggedImage:(NSImage*)anImage
endedAt:(NSPoint)aPoint
operation:(NSDragOperation)operation {
beingDragged_ = NO;
[[self cell] setHighlighted:NO];
}
- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
return isLocal ? NSDragOperationMove : NSDragOperationNone;
}
- (void)mouseUp:(NSEvent*)theEvent {
// This conditional is never true (DnD loops in Cocoa eat the mouse
// up) but I added it in case future versions of Cocoa do unexpected
// things.
if (beingDragged_)
return [super mouseUp:theEvent];
// There are non-drag cases where a mouseUp: may happen
// (e.g. mouse-down, cmd-tab to another application, move mouse,
// mouse-up). So we check.
NSPoint viewLocal = [self convertPoint:[theEvent locationInWindow]
fromView:[[self window] contentView]];
if (NSPointInRect(viewLocal, [self bounds])) {
[self performClick:self];
} else {
[[self cell] setHighlighted:NO];
}
}
// Mimic "begin a click" operation visually. Do NOT follow through
// with normal button event handling.
- (void)mouseDown:(NSEvent*)theEvent {
[[self cell] setHighlighted:YES];
initialMouseDownLocation_ = [theEvent locationInWindow];
}
// Return YES if we have crossed a threshold of movement after
// mouse-down when we should begin a drag. Else NO.
- (BOOL)hasCrossedDragThreshold:(NSEvent*)theEvent {
NSPoint currentLocation = [theEvent locationInWindow];
if ((abs(currentLocation.x - initialMouseDownLocation_.x) >
kWebDragStartHysteresisX) ||
(abs(currentLocation.y - initialMouseDownLocation_.y) >
kWebDragStartHysteresisY)) {
return YES;
} else {
return NO;
}
}
- (void)mouseDragged:(NSEvent*)theEvent {
if (beingDragged_)
[super mouseDragged:theEvent];
else {
if (draggable_ && [self hasCrossedDragThreshold:theEvent]) {
[self beginDrag:theEvent];
}
}
}
@end
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