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<pre class="sourcecodebox">/*
File: VideoWindow.m
Abstract: Implementation file for the video window class in CocoaDVDPlayer, an
ADC Reference Library sample project.
Version: 1.0
IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under
Apple's copyrights in this original Apple software (the "Apple Software"), to
use, reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions
of the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
implied, are granted by Apple herein, including but not limited to any patent
rights that may be infringed by your derivative works or by other works in which
the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR
DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF
CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF
APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Copyright © 2005 Apple Computer, Inc., All Rights Reserved
*/
#import <DVDPlayback/DVDPlayback.h>
#import "VideoWindow.h"
#import "Controller.h"
/*
********************************************************************************
**
** Class: VideoWindow
**
********************************************************************************
*/
/* These methods are used inside this file only. Instead of declaring them in
VideoWindow.h, we declare them here in a category that extends the class. */
@interface VideoWindow (InternalMethods)
- (void) setVideoBounds;
- (void) setVideoDisplay;
- (float) titleAspectRatio;
- (NSSize) getVideoSize;
@end
@implementation VideoWindow
- (void) awakeFromNib
{
/* register for notifications */
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(windowDidMove:)
name:NSWindowDidMoveNotification
object:NULL];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(frameDidChange:)
name:NSViewFrameDidChangeNotification
object:NULL];
/* we want to respond to mouse movements -- see sendEvent */
[self setAcceptsMouseMovedEvents:YES];
/* display a black background before media starts playing */
[self setBackgroundColor: [NSColor blackColor]];
}
- (void) keyDown:(NSEvent *)theEvent
{
/* pass all key-down events in this window to our delegate, the Controller
object */
BOOL eventHandled = [[self delegate] onKeyDown:theEvent];
if (eventHandled == NO) {
[super keyDown:theEvent];
} else {
[self flushBufferedKeyEvents];
}
}
/* This method overrides NSWindow to handle button mouse-overs and mouse-clicks
in the window. */
- (void) sendEvent:(NSEvent *)theEvent
{
/* index of selected button in DVD menu */
SInt32 index = kDVDButtonIndexNone;
/* convert mouse location to QuickDraw coordinates */
NSPoint location = [theEvent locationInWindow];
Point portPt;
portPt.h = location.x;
portPt.v = [self frame].size.height - location.y;
/* notify DVD Playback */
switch ([theEvent type])
{
OSStatus err;
case NSMouseMoved:
err = DVDDoMenuMouseOver (portPt, &index);
break;
case NSLeftMouseDown:
err = DVDDoMenuClick (portPt, &index);
break;
default:
break;
}
/* sync the cursor */
NSCursor *cursor;
if (index != kDVDButtonIndexNone) {
cursor = [NSCursor pointingHandCursor];
}
else {
cursor = [NSCursor arrowCursor];
}
[cursor set];
/* pass the event back to NSWindow for additional handling */
[super sendEvent:theEvent];
}
/* This method returns a number that represents the aspect ratio of the
current title. */
- (float) titleAspectRatio
{
const float kStandardRatio = 4.0 / 3.0;
const float kWideRatio = 16.0 / 9.0;
float ratio = kStandardRatio;
DVDAspectRatio format = kDVDAspectRatioUninitialized;
DVDGetAspectRatio (&format);
switch (format) {
case kDVDAspectRatio4x3:
case kDVDAspectRatio4x3PanAndScan:
case kDVDAspectRatioUninitialized:
ratio = kStandardRatio;
break;
case kDVDAspectRatio16x9:
case kDVDAspectRatioLetterBox:
ratio = kWideRatio;
break;
}
return ratio;
}
/* This method finds the native video size of the current title and adjusts the
width so the aspect ratio is correct (this is arbitrary -- we could also adjust
the height.) This information is needed when the user chooses either the small
or the normal window size from the Video menu. */
- (NSSize) getVideoSize
{
/* get the native height and width of the media */
UInt16 width = 720, height = 480;
DVDGetNativeVideoSize (&width, &height);
NSSize size;
size.height = height;
/* adjust the width using the current aspect ratio */
size.width = size.height * [self titleAspectRatio];
return size;
}
/* This method sets the dimensions of the window's content area and positions
the window on the screen. The setWindowSize message is sent (1) when the user
chooses one of the 3 standard sizes in the Video menu, (2) when the user resizes
the window manually, and (3) when the aspect ratio of the playback title
changes. */
- (void) setWindowSize: (PlaybackVideoSize)inSize
{
/* get the aspect ratio of the current title */
float titleRatio = [self titleAspectRatio];
/* get the bounding rectangle of the display for this window, excluding
menu bar and dock */
NSRect screenBounds = [[self screen] visibleFrame];
/* create and initialize a rectangle for the new content area */
NSRect frame = [self frame];
NSPoint topLeft = { frame.origin.x, frame.origin.y + frame.size.height };
NSSize bounds = [[self contentView] bounds].size;
/* now compute the new bounds */
switch (inSize)
{
case kVideoSizeCurrent: {
/* apply the aspect ratio to the new size */
bounds.width = bounds.height * titleRatio;
if (bounds.width > screenBounds.size.width) {
bounds.width = screenBounds.size.width;
bounds.height = screenBounds.size.width * (1.0 / titleRatio);
}
break;
}
case kVideoSizeNormal: {
bounds = [self getVideoSize];
break;
}
case kVideoSizeSmall: {
bounds = [self getVideoSize];
bounds.width /= 2;
bounds.height /= 2;
break;
}
case kVideoSizeMax: {
/* find the largest frame that fits inside the display bounds */
float screenRatio = screenBounds.size.width / screenBounds.size.height;
if (screenRatio >= titleRatio) {
bounds.height = screenBounds.size.height;
bounds.width = screenBounds.size.height * titleRatio;
}
else {
bounds.width = screenBounds.size.width;
bounds.height = screenBounds.size.width * (1.0 / titleRatio);
}
/* move window to top left corner of screen */
topLeft.x = screenBounds.origin.x;
topLeft.y = screenBounds.size.height + screenBounds.origin.y;
break;
}
}
/* update the window location and size */
[self disableFlushWindow];
[self setContentSize:bounds];
[self setFrameTopLeftPoint:topLeft];
[self enableFlushWindow];
}
/* This method sets the video window state in DVD Playback Services. The
setupVideoWindow message is sent by the Controller object during playback
session initialization. */
- (void) setupVideoWindow
{
NSLog(@"Step 2: Set Video Window");
OSStatus result = DVDSetVideoWindowID ([self windowNumber]);
NSAssert1 (!result, @"DVDSetVideoWindowID returned %d", result);
[self setVideoDisplay];
/* set initial bounds of video area in window */
[self setVideoBounds];
}
/* This method finds the display ID for our window and notifies DVD Playback
Services. The setVideoDisplay message is sent (1) when CocoaDVDPlayer finishes
launching and the Controller object sends us the setupVideoWindow message, and
(2) when the user moves the window to a new location. */
- (void) setVideoDisplay
{
static CGDirectDisplayID curDisplay = 0;
/* get the ID of the display that contains the largest part of the window */
CGDirectDisplayID newDisplay = (CGDirectDisplayID)
[[[[self screen] deviceDescription] valueForKey:@"NSScreenNumber"] intValue];
/* if the display has changed, set the new display */
if (newDisplay != curDisplay) {
NSLog(@"Step 3: Set Video Display");
Boolean isSupported = FALSE;
OSStatus result = DVDSwitchToDisplay (newDisplay, &isSupported);
NSAssert1 (!result, @"DVDSwitchToDisplay returned %d", result);
if (isSupported) {
curDisplay = newDisplay;
}
else {
NSLog(@"video display %d not supported", newDisplay);
}
}
}
/* This method finds our video area (that is, our content view) and passes it to
DVD Playback Services. The setVideoBounds message is sent (1) when
CocoaDVDPlayer finishes launching and the Controller object sends us the
setupVideoWindow message, (2) when the user resizes our window frame, and (3)
when the aspect ratio of the title changes. */
- (void) setVideoBounds
{
NSLog(@"Step 4: Set Video Bounds");
NSRect content = [[self contentView] bounds];
NSRect frame = [self frame];
/* create an equivalent QuickDraw rectangle with window local coordinates */
Rect qdRect;
qdRect.left = 0;
qdRect.right = content.size.width;
qdRect.bottom = frame.size.height;
qdRect.top = frame.size.height - content.size.height;
/* set the video area */
OSStatus result = DVDSetVideoBounds (&qdRect);
NSAssert1 (!result, @"DVDSetVideoBounds returned %d", result);
}
#pragma mark NSWindow notifications
- (void) frameDidChange:(NSNotification *)notification
{
if ([notification object] == [self contentView]) {
[self setWindowSize:kVideoSizeCurrent];
[self setVideoBounds];
}
}
- (void) windowDidMove:(NSNotification *)notification
{
if ([notification object] == self)
[self setVideoDisplay];
}
@end
</pre>
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