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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.
#include "base/logging.h"
#import "base/scoped_nsobject.h"
#import "chrome/browser/cocoa/bookmark_button.h"
#import "chrome/browser/cocoa/bookmark_button_cell.h"
#import "third_party/GTM/AppKit/GTMTheme.h"
namespace {
// Code taken from <http://codereview.chromium.org/180036/diff/3001/3004>.
// TODO(viettrungluu): Do we want common, standard code for drag hysteresis?
const CGFloat kWebDragStartHysteresisX = 5.0;
const CGFloat kWebDragStartHysteresisY = 5.0;
// The opacity of the bookmark button drag image.
const CGFloat kDragImageOpacity = 0.7;
}
@interface BookmarkButton(Private)
// Make a drag image for the button.
- (NSImage*)dragImage;
@end // @interface BookmarkButton(Private)
@implementation BookmarkButton
@synthesize draggable = draggable_;
@synthesize delegate = delegate_;
- (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 {
// Starting drag. Never start another drag until another mouse down.
mayDragStart_ = NO;
if (delegate_) {
// Ask our delegate to fill the pasteboard for us.
NSPasteboard* pboard = [NSPasteboard pasteboardWithName:NSDragPboard];
[delegate_ fillPasteboard:pboard forDragOfButton:self];
// 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;
NSSize dragOffset = NSMakeSize(0.0, 0.0);
[self dragImage:[self dragImage] at:NSMakePoint(0, yAt) offset:dragOffset
event:event pasteboard:pboard source:self slideBack:YES];
// And we're done.
[self autorelease];
} else {
// Avoid blowing up, but we really shouldn't get here.
NOTREACHED();
}
}
- (void)draggedImage:(NSImage*)anImage
endedAt:(NSPoint)aPoint
operation:(NSDragOperation)operation {
beingDragged_ = NO;
[[self cell] setHighlighted:NO];
}
- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
return isLocal ? NSDragOperationCopy | NSDragOperationMove
: NSDragOperationCopy;
}
- (void)mouseUp:(NSEvent*)theEvent {
// Make sure that we can't start a drag until we see a mouse down again.
mayDragStart_ = NO;
// 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_) {
NOTREACHED();
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 {
mayDragStart_ = YES;
[[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_ && mayDragStart_ &&
[self hasCrossedDragThreshold:theEvent]) {
[self beginDrag:theEvent];
}
}
@end
@implementation BookmarkButton(Private)
- (NSImage*)dragImage {
NSRect bounds = [self bounds];
// Grab the image from the screen and put it in an |NSImage|. We can't use
// this directly since we need to clip it and set its opacity. This won't work
// if the source view is clipped. Fortunately, we don't display clipped
// bookmark buttons.
[self lockFocus];
scoped_nsobject<NSBitmapImageRep>
bitmap([[NSBitmapImageRep alloc] initWithFocusedViewRect:bounds]);
[self unlockFocus];
scoped_nsobject<NSImage> image([[NSImage alloc] initWithSize:[bitmap size]]);
[image addRepresentation:bitmap];
// Make an autoreleased |NSImage|, which will be returned, and draw into it.
// By default, the |NSImage| will be completely transparent.
NSImage* dragImage =
[[[NSImage alloc] initWithSize:[bitmap size]] autorelease];
[dragImage lockFocus];
// Draw the image with the appropriate opacity, clipping it tightly.
GradientButtonCell* cell = static_cast<GradientButtonCell*>([self cell]);
DCHECK([cell isKindOfClass:[GradientButtonCell class]]);
[[cell clipPathForFrame:bounds inView:self] setClip];
[image drawAtPoint:NSMakePoint(0, 0)
fromRect:NSMakeRect(0, 0, NSWidth(bounds), NSHeight(bounds))
operation:NSCompositeSourceOver
fraction:kDragImageOpacity];
[dragImage unlockFocus];
return dragImage;
}
@end // @implementation BookmarkButton(Private)
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