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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsMacCursor.h"
+#include "nsObjCExceptions.h"
+#include "nsDebug.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsCOMPtr.h"
+#include "nsIFile.h"
+#include "nsString.h"
+
+/*! @category nsMacCursor (PrivateMethods)
+ @abstract Private methods internal to the nsMacCursor class.
+ @discussion <code>nsMacCursor</code> is effectively an abstract class. It
+ does not define complete behaviour in and of itself, the subclasses defined
+ in this file provide the useful implementations.
+*/
+@interface nsMacCursor (PrivateMethods)
+
+/*! @method getNextCursorFrame
+ @abstract get the index of the next cursor frame to display.
+ @discussion Increments and returns the frame counter of an animated cursor.
+ @result The index of the next frame to display in the cursor animation
+*/
+- (int)getNextCursorFrame;
+
+/*! @method numFrames
+ @abstract Query the number of frames in this cursor's animation.
+ @discussion Returns the number of frames in this cursor's animation. Static
+ cursors return 1.
+*/
+- (int)numFrames;
+
+/*! @method createTimer
+ @abstract Create a Timer to use to animate the cursor.
+ @discussion Creates an instance of <code>NSTimer</code> which is used to
+ drive the cursor animation. This method should only be called for cursors
+ that are animated.
+*/
+- (void)createTimer;
+
+/*! @method destroyTimer
+ @abstract Destroy any timer instance associated with this cursor.
+ @discussion Invalidates and releases any <code>NSTimer</code> instance
+ associated with this cursor.
+ */
+- (void)destroyTimer;
+/*! @method destroyTimer
+ @abstract Destroy any timer instance associated with this cursor.
+ @discussion Invalidates and releases any <code>NSTimer</code> instance
+ associated with this cursor.
+*/
+
+/*! @method advanceAnimatedCursor:
+ @abstract Method called by animation timer to perform animation.
+ @discussion Called by an animated cursor's associated timer to advance the
+ animation to the next frame. Determines which frame should occur next and
+ sets the cursor to that frame.
+ @param aTimer the timer causing the animation
+*/
+- (void)advanceAnimatedCursor:(NSTimer*)aTimer;
+
+/*! @method setFrame:
+ @abstract Sets the current cursor, using an index to determine which frame
+ in the animation to display.
+ @discussion Sets the current cursor. The frame index determines which frame
+ is shown if the cursor is animated. Frames and numbered from <code>0</code>
+ to <code>-[nsMacCursor numFrames] - 1</code>. A static cursor has a single
+ frame, numbered 0.
+ @param aFrameIndex the index indicating which frame from the animation
+ to display
+*/
+- (void)setFrame:(int)aFrameIndex;
+
+@end
+
+/*! @class nsCocoaCursor
+ @abstract Implementation of <code>nsMacCursor</code> that uses Cocoa
+ <code>NSCursor</code> instances.
+ @discussion Displays a static or animated cursor, using Cocoa
+ <code>NSCursor</code> instances. These can be either built-in
+ <code>NSCursor</code> instances, or custom <code>NSCursor</code>s created
+ from images. When more than one <code>NSCursor</code> is provided, the cursor
+ will use these as animation frames.
+*/
+@interface nsCocoaCursor : nsMacCursor {
+ @private
+ NSArray* mFrames;
+ NSCursor* mLastSetCocoaCursor;
+}
+
+/*! @method initWithFrames:
+ @abstract Create an animated cursor by specifying the frames to use for
+ the animation.
+ @discussion Creates a cursor that will animate by cycling through the given
+ frames. Each element of the array must be an instance of
+ <code>NSCursor</code>
+ @param aCursorFrames an array of <code>NSCursor</code>, representing
+ the frames of an animated cursor, in the order they should be played.
+ @param aType the corresponding <code>nsCursor</code> constant
+ @result an instance of <code>nsCocoaCursor</code> that will animate the
+ given cursor frames
+ */
+- (id)initWithFrames:(NSArray*)aCursorFrames type:(nsCursor)aType;
+
+/*! @method initWithCursor:
+ @abstract Create a cursor by specifying a Cocoa <code>NSCursor</code>.
+ @discussion Creates a cursor representing the given Cocoa built-in cursor.
+ @param aCursor the <code>NSCursor</code> to use
+ @param aType the corresponding <code>nsCursor</code> constant
+ @result an instance of <code>nsCocoaCursor</code> representing the given
+ <code>NSCursor</code>
+*/
+- (id)initWithCursor:(NSCursor*)aCursor type:(nsCursor)aType;
+
+/*! @method initWithImageNamed:hotSpot:
+ @abstract Create a cursor by specifying the name of an image resource to
+ use for the cursor and a hotspot.
+ @discussion Creates a cursor by loading the named image using the
+ <code>+[NSImage imageNamed:]</code> method. <p>The image must be compatible
+ with any restrictions laid down by <code>NSCursor</code>. These vary by
+ operating system version.</p> <p>The hotspot precisely determines the point
+ where the user clicks when using the cursor.</p>
+ @param aCursor the name of the image to use for the cursor
+ @param aPoint the point within the cursor to use as the hotspot
+ @param aType the corresponding <code>nsCursor</code> constant
+ @result an instance of <code>nsCocoaCursor</code> that uses the given
+ image and hotspot
+*/
+- (id)initWithImageNamed:(NSString*)aCursorImage
+ hotSpot:(NSPoint)aPoint
+ type:(nsCursor)aType;
+
+@end
+
+@implementation nsMacCursor
+
++ (nsMacCursor*)cursorWithCursor:(NSCursor*)aCursor type:(nsCursor)aType {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ return [[[nsCocoaCursor alloc] initWithCursor:aCursor
+ type:aType] autorelease];
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
++ (nsMacCursor*)cursorWithImageNamed:(NSString*)aCursorImage
+ hotSpot:(NSPoint)aPoint
+ type:(nsCursor)aType {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ return [[[nsCocoaCursor alloc] initWithImageNamed:aCursorImage
+ hotSpot:aPoint
+ type:aType] autorelease];
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
++ (nsMacCursor*)cursorWithFrames:(NSArray*)aCursorFrames type:(nsCursor)aType {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ return [[[nsCocoaCursor alloc] initWithFrames:aCursorFrames
+ type:aType] autorelease];
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
++ (NSCursor*)cocoaCursorWithImageNamed:(NSString*)imageName
+ hotSpot:(NSPoint)aPoint {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ nsCOMPtr<nsIFile> resDir;
+ nsAutoCString resPath;
+ NSString *pathToImage, *pathToHiDpiImage;
+ NSImage *cursorImage, *hiDpiCursorImage;
+
+ nsresult rv = NS_GetSpecialDirectory(NS_GRE_DIR, getter_AddRefs(resDir));
+ if (NS_FAILED(rv)) goto INIT_FAILURE;
+ resDir->AppendNative("res"_ns);
+ resDir->AppendNative("cursors"_ns);
+
+ rv = resDir->GetNativePath(resPath);
+ if (NS_FAILED(rv)) goto INIT_FAILURE;
+
+ pathToImage = [NSString stringWithUTF8String:(const char*)resPath.get()];
+ if (!pathToImage) goto INIT_FAILURE;
+ pathToImage = [pathToImage stringByAppendingPathComponent:imageName];
+ pathToHiDpiImage = [pathToImage stringByAppendingString:@"@2x"];
+ // Add same extension to both image paths.
+ pathToImage = [pathToImage stringByAppendingPathExtension:@"png"];
+ pathToHiDpiImage = [pathToHiDpiImage stringByAppendingPathExtension:@"png"];
+
+ cursorImage =
+ [[[NSImage alloc] initWithContentsOfFile:pathToImage] autorelease];
+ if (!cursorImage) goto INIT_FAILURE;
+
+ // Note 1: There are a few different ways to get a hidpi image via
+ // initWithContentsOfFile. We let the OS handle this here: when the
+ // file basename ends in "@2x", it will be displayed at native resolution
+ // instead of being pixel-doubled. See bug 784909 comment 7 for alternates
+ // ways.
+ //
+ // Note 2: The OS is picky, and will ignore the hidpi representation
+ // unless it is exactly twice the size of the lowdpi image.
+ hiDpiCursorImage =
+ [[[NSImage alloc] initWithContentsOfFile:pathToHiDpiImage] autorelease];
+ if (hiDpiCursorImage) {
+ NSImageRep* imageRep = [[hiDpiCursorImage representations] objectAtIndex:0];
+ [cursorImage addRepresentation:imageRep];
+ }
+ return [[[NSCursor alloc] initWithImage:cursorImage
+ hotSpot:aPoint] autorelease];
+
+INIT_FAILURE:
+ NS_WARNING("Problem getting path to cursor image file!");
+ [self release];
+ return nil;
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (BOOL)isSet {
+ // implemented by subclasses
+ return NO;
+}
+
+- (void)set {
+ if ([self isAnimated]) {
+ [self createTimer];
+ }
+ // if the cursor isn't animated or the timer creation fails for any reason...
+ if (!mTimer) {
+ [self setFrame:0];
+ }
+}
+
+- (void)unset {
+ [self destroyTimer];
+}
+
+- (BOOL)isAnimated {
+ return [self numFrames] > 1;
+}
+
+- (int)numFrames {
+ // subclasses need to override this to support animation
+ return 1;
+}
+
+- (int)getNextCursorFrame {
+ mFrameCounter = (mFrameCounter + 1) % [self numFrames];
+ return mFrameCounter;
+}
+
+- (void)createTimer {
+ NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+ if (!mTimer) {
+ mTimer = [[NSTimer
+ scheduledTimerWithTimeInterval:0.25
+ target:self
+ selector:@selector(advanceAnimatedCursor:)
+ userInfo:nil
+ repeats:YES] retain];
+ }
+
+ NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+- (void)destroyTimer {
+ NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+ if (mTimer) {
+ [mTimer invalidate];
+ [mTimer release];
+ mTimer = nil;
+ }
+
+ NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+- (void)advanceAnimatedCursor:(NSTimer*)aTimer {
+ NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+ if ([aTimer isValid]) {
+ [self setFrame:[self getNextCursorFrame]];
+ }
+
+ NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+- (void)setFrame:(int)aFrameIndex {
+ // subclasses need to do something useful here
+}
+
+- (nsCursor)type {
+ return mType;
+}
+
+- (void)dealloc {
+ NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+ [self destroyTimer];
+ [super dealloc];
+
+ NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+@end
+
+@implementation nsCocoaCursor
+
+- (id)initWithFrames:(NSArray*)aCursorFrames type:(nsCursor)aType {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ self = [super init];
+ NSEnumerator* it = [aCursorFrames objectEnumerator];
+ NSObject* frame = nil;
+ while ((frame = [it nextObject])) {
+ NS_ASSERTION([frame isKindOfClass:[NSCursor class]],
+ "Invalid argument: All frames must be of type NSCursor");
+ }
+ mFrames = [aCursorFrames retain];
+ mFrameCounter = 0;
+ mType = aType;
+ return self;
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (id)initWithCursor:(NSCursor*)aCursor type:(nsCursor)aType {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ NSArray* frame = [NSArray arrayWithObjects:aCursor, nil];
+ return [self initWithFrames:frame type:aType];
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (id)initWithImageNamed:(NSString*)aCursorImage
+ hotSpot:(NSPoint)aPoint
+ type:(nsCursor)aType {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ return
+ [self initWithCursor:[nsMacCursor cocoaCursorWithImageNamed:aCursorImage
+ hotSpot:aPoint]
+ type:aType];
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (BOOL)isSet {
+ return [NSCursor currentCursor] == mLastSetCocoaCursor;
+}
+
+- (void)setFrame:(int)aFrameIndex {
+ NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+ NSCursor* newCursor = [mFrames objectAtIndex:aFrameIndex];
+ [newCursor set];
+ mLastSetCocoaCursor = newCursor;
+
+ NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+- (int)numFrames {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ return [mFrames count];
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(0);
+}
+
+- (NSString*)description {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ return [mFrames description];
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (void)dealloc {
+ NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+ [mFrames release];
+ [super dealloc];
+
+ NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+@end