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1/*
2 * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#import "WebNodeHighlight.h"
30#import "WebNodeHighlightView.h"
31#import "WebNSViewExtras.h"
32
33#import <WebCore/InspectorController.h>
34#import <wtf/Assertions.h>
35
36using namespace WebCore;
37
38@interface WebNodeHighlight (FileInternal)
39- (NSRect)_computeHighlightWindowFrame;
40- (void)_repositionHighlightWindow;
41@end
42
43@implementation WebNodeHighlight
44
45- (id)initWithTargetView:(NSView *)targetView inspectorController:(InspectorController*)inspectorController
46{
47    self = [super init];
48    if (!self)
49        return nil;
50
51    _targetView = [targetView retain];
52    _inspectorController = inspectorController;
53
54    int styleMask = NSBorderlessWindowMask;
55    NSRect contentRect = [NSWindow contentRectForFrameRect:[self _computeHighlightWindowFrame] styleMask:styleMask];
56    _highlightWindow = [[NSWindow alloc] initWithContentRect:contentRect styleMask:styleMask backing:NSBackingStoreBuffered defer:NO];
57    [_highlightWindow setBackgroundColor:[NSColor clearColor]];
58    [_highlightWindow setOpaque:NO];
59    [_highlightWindow setIgnoresMouseEvents:YES];
60    [_highlightWindow setReleasedWhenClosed:NO];
61
62    _highlightView = [[WebNodeHighlightView alloc] initWithWebNodeHighlight:self];
63    [_highlightWindow setContentView:_highlightView];
64    [_highlightView release];
65
66    return self;
67}
68
69- (void)dealloc
70{
71    ASSERT(!_highlightWindow);
72    ASSERT(!_targetView);
73    ASSERT(!_highlightView);
74
75    [super dealloc];
76}
77
78- (void)attach
79{
80    ASSERT(_targetView);
81    ASSERT([_targetView window]);
82    ASSERT(_highlightWindow);
83
84    if (!_highlightWindow || !_targetView || ![_targetView window])
85        return;
86
87    [[_targetView window] addChildWindow:_highlightWindow ordered:NSWindowAbove];
88
89    // Observe both frame-changed and bounds-changed notifications because either one could leave
90    // the highlight incorrectly positioned with respect to the target view. We need to do this for
91    // the entire superview hierarchy to handle scrolling, bars coming and going, etc.
92    // (without making concrete assumptions about the view hierarchy).
93    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
94    for (NSView *v = _targetView; v; v = [v superview]) {
95        [notificationCenter addObserver:self selector:@selector(_repositionHighlightWindow) name:NSViewFrameDidChangeNotification object:v];
96        [notificationCenter addObserver:self selector:@selector(_repositionHighlightWindow) name:NSViewBoundsDidChangeNotification object:v];
97    }
98
99    if (_delegate && [_delegate respondsToSelector:@selector(didAttachWebNodeHighlight:)])
100        [_delegate didAttachWebNodeHighlight:self];
101}
102
103- (id)delegate
104{
105    return _delegate;
106}
107
108- (void)detach
109{
110    if (!_highlightWindow) {
111        ASSERT(!_targetView);
112        return;
113    }
114
115    if (_delegate && [_delegate respondsToSelector:@selector(willDetachWebNodeHighlight:)])
116        [_delegate willDetachWebNodeHighlight:self];
117
118    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
119    [notificationCenter removeObserver:self name:NSViewFrameDidChangeNotification object:nil];
120    [notificationCenter removeObserver:self name:NSViewBoundsDidChangeNotification object:nil];
121
122    [[_highlightWindow parentWindow] removeChildWindow:_highlightWindow];
123
124    [_highlightWindow release];
125    _highlightWindow = nil;
126
127    [_targetView release];
128    _targetView = nil;
129
130    // We didn't retain _highlightView, but we do need to tell it to forget about us, so it doesn't
131    // try to send our delegate messages after we've been dealloc'ed, e.g.
132    [_highlightView detachFromWebNodeHighlight];
133    _highlightView = nil;
134}
135
136- (WebNodeHighlightView *)highlightView
137{
138    return _highlightView;
139}
140
141- (void)setDelegate:(id)delegate
142{
143    // The delegate is not retained, as usual in Cocoa.
144    _delegate = delegate;
145}
146
147- (void)setNeedsUpdateInTargetViewRect:(NSRect)rect
148{
149    ASSERT(_targetView);
150
151    [[_targetView window] disableScreenUpdatesUntilFlush];
152
153    // Mark the whole highlight view as needing display since we don't know what areas
154    // need updated, since the highlight can be larger than the element to show margins.
155    [_highlightView setNeedsDisplay:YES];
156
157    // Redraw highlight view immediately so it updates in sync with the target view.
158    // This is especially visible when resizing the window, scrolling or with DHTML.
159    [_highlightView displayIfNeeded];
160}
161
162- (NSView *)targetView
163{
164    return _targetView;
165}
166
167- (InspectorController*)inspectorController
168{
169    return _inspectorController;
170}
171
172@end
173
174@implementation WebNodeHighlight (FileInternal)
175
176- (NSRect)_computeHighlightWindowFrame
177{
178    ASSERT(_targetView);
179    ASSERT([_targetView window]);
180
181    NSRect highlightWindowFrame = [_targetView convertRect:[_targetView visibleRect] toView:nil];
182    highlightWindowFrame.origin = [[_targetView window] convertBaseToScreen:highlightWindowFrame.origin];
183
184    return highlightWindowFrame;
185}
186
187- (void)_repositionHighlightWindow
188{
189    // This assertion fires in cases where a new tab is created while the highlight
190    // is showing (<http://bugs.webkit.org/show_bug.cgi?id=14254>)
191    ASSERT([_targetView window]);
192
193    // Until that bug is fixed, bail out to avoid worse problems where the highlight
194    // moves to a nonsense location.
195    if (![_targetView window])
196        return;
197
198    // Disable screen updates so the highlight moves in sync with the view.
199    [[_targetView window] disableScreenUpdatesUntilFlush];
200
201    [_highlightWindow setFrame:[self _computeHighlightWindowFrame] display:YES];
202}
203
204@end
205