我正在尝试用 Objective-C 为我的 Mac 重新编写一个用于 Windows 的应用程序，并且我希望能够做一些类似于 Mac 的热门角落的事情。如果我将鼠标移动到屏幕的左侧，它将使一个窗口可见，如果我将它移到窗口位置之外，则窗口将再次隐藏。 （窗口将被推到屏幕的左侧）。
有谁知道我在哪里可以找到一些演示代码（或参考）来说明如何执行此操作，或者至少如何判断鼠标在哪里，即使当前应用程序不在顶部。 （不知道怎么写，太习惯于 Windows 世界了）。
谢谢
-布拉德
【问题讨论】：
标签： objective-c cocoa macos
您将希望在屏幕边缘实现一个不可见的窗口，并设置窗口顺序，使其始终位于顶部。然后，您可以在此窗口中侦听鼠标移动的事件。
要将窗口设置为不可见并位于顶部，请使用如下调用来创建窗口子类：
[self setBackgroundColor:[NSColor clearColor]];
[self setExcludedFromWindowsMenu:YES];
[self setCanHide:NO];
[self setLevel:NSScreenSaverWindowLevel];
[self setAlphaValue:0.0f];
[self setOpaque:NO];
[self orderFrontRegardless];
然后，打开鼠标移动事件，
[self setAcceptsMouseMovedEvents:YES];
将导致窗口调用：
- (void)mouseMoved:(NSEvent *)theEvent
{
NSLog(@"mouse moved into invisible window.");
}
所以希望这足以让你开始。
-肯
【讨论】：
这是 AutoHidingWindow - SlidingWindow 的子类，当鼠标碰到屏幕边缘时会弹出。欢迎反馈。
@interface ActivationWindow : NSWindow
{
AutoHidingWindow *_activationDelegate;
NSTrackingArea *_trackingArea;
}
- (ActivationWindow*)initWithDelegate:(AutoHidingWindow*)activationDelegate;
@property (assign) AutoHidingWindow *activationDelegate;
@property (retain) NSTrackingArea *trackingArea;
- (void)adjustWindowFrame;
- (void)adjustTrackingArea;
@end
@interface AutoHidingWindow ()
- (void)autoShow;
- (void)autoHide;
@end
@implementation AutoHidingWindow
- (id)initWithContentRect:(NSRect) contentRect
styleMask:(unsigned int) styleMask
backing:(NSBackingStoreType) backingType
defer:(BOOL) flag
{
if ((self = [super initWithContentRect:contentRect
styleMask:NSBorderlessWindowMask
backing:backingType
defer:flag])) {
_activationWindow = [[ActivationWindow alloc] initWithDelegate:self];
}
return self;
}
@synthesize activationWindow = _activationWindow;
- (void)dealloc
{
[_activationWindow release], _activationWindow = nil;
[super dealloc];
}
- (void)makeKeyAndOrderFront:(id)sender
{
[super makeKeyAndOrderFront:sender];
}
- (void)autoShow
{
[self makeKeyAndOrderFront:self];
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(autoHide) object:nil];
[self performSelector:@selector(autoHide) withObject:nil afterDelay:2];
}
- (void)autoHide
{
NSPoint mouseLocation = [NSEvent mouseLocation];
NSRect windowFrame = [self frame];
if (NSPointInRect(mouseLocation, windowFrame)) {
[self performSelector:@selector(autoHide) withObject:nil afterDelay:2];
}
else {
[self orderOut:self];
}
}
@end
@implementation ActivationWindow
- (ActivationWindow*)initWithDelegate:(AutoHidingWindow*)activationDelegate
{
if ((self = [super initWithContentRect:[[NSScreen mainScreen] frame]
styleMask:NSBorderlessWindowMask
backing:NSBackingStoreBuffered
defer:NO]) != nil) {
_activationDelegate = activationDelegate;
[self setBackgroundColor:[NSColor clearColor]];
[self setExcludedFromWindowsMenu:YES];
[self setCanHide:NO];
[self setHasShadow:NO];
[self setLevel:NSScreenSaverWindowLevel];
[self setAlphaValue:0.0];
[self setIgnoresMouseEvents:YES];
[self setOpaque:NO];
[self orderFrontRegardless];
[self adjustWindowFrame];
[self.activationDelegate addObserver:self
forKeyPath:@"slidingEdge"
options:0
context:@"slidingEdge"];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(screenParametersChanged:)
name:NSApplicationDidChangeScreenParametersNotification
object:nil];
}
return self;
}
@synthesize activationDelegate = _activationDelegate;
@synthesize trackingArea = _trackingArea;
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ([@"slidingEdge" isEqual:context]) {
[self adjustTrackingArea];
}
else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[self.activationDelegate removeObserver:self forKeyPath:@"slidingEdge"];
_activationDelegate = nil;
[_trackingArea release], _trackingArea = nil;
[super dealloc];
}
- (void)screenParametersChanged:(NSNotification *)notification
{
[self adjustWindowFrame];
}
- (void)adjustWindowFrame
{
NSScreen *mainScreen = [NSScreen mainScreen];
CGFloat menuBarHeight = [NSMenuView menuBarHeight];
NSRect windowFrame = [mainScreen frame];
windowFrame.size.height -= menuBarHeight;
[self setFrame:windowFrame display:NO];
[self adjustTrackingArea];
}
- (void)adjustTrackingArea
{
NSView *contentView = [self contentView];
NSRect trackingRect = contentView.bounds;
CGRectEdge slidingEdge = self.activationDelegate.slidingEdge;
CGFloat trackingRectSize = 2.0;
switch (slidingEdge) {
case CGRectMaxXEdge:
trackingRect.origin.x = trackingRect.origin.x + trackingRect.size.width - trackingRectSize;
trackingRect.size.width = trackingRectSize;
break;
case CGRectMaxYEdge:
trackingRect.origin.y = trackingRect.origin.y + trackingRect.size.height - trackingRectSize;
trackingRect.size.height = trackingRectSize;
break;
case CGRectMinXEdge:
trackingRect.origin.x = 0;
trackingRect.size.width = trackingRectSize;
break;
case CGRectMinYEdge:
default:
trackingRect.origin.y = 0;
trackingRect.size.height = trackingRectSize;
}
NSTrackingAreaOptions options =
NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved |
NSTrackingActiveAlways |
NSTrackingEnabledDuringMouseDrag;
NSTrackingArea *trackingArea = self.trackingArea;
if (trackingArea != nil) {
[contentView removeTrackingArea:trackingArea];
}
trackingArea = [[NSTrackingArea alloc] initWithRect:trackingRect
options:options
owner:self
userInfo:nil];
[contentView addTrackingArea:trackingArea];
self.trackingArea = [trackingArea autorelease];
}
- (void)mouseEntered:(NSEvent *)theEvent
{
[self.activationDelegate autoShow];
}
- (void)mouseMoved:(NSEvent *)theEvent
{
[self.activationDelegate autoShow];
}
- (void)mouseExited:(NSEvent *)theEvent
{
}
@end
【讨论】：
您可以看看我们在 Visor 项目中是如何做到的： http://github.com/binaryage/visor/blob/master/src/Visor.m#L1025-1063
【讨论】：
这就是我想出的。感谢 Peter 提供上述提示。
@interface SlidingWindow : NSWindow
{
CGRectEdge _slidingEdge;
NSView *_wrapperView;
}
@property (nonatomic, assign) CGRectEdge slidingEdge;
@property (nonatomic, retain) NSView *wrapperView;
-(id)initWithContentRect:(NSRect) contentRect
styleMask:(unsigned int) styleMask
backing:(NSBackingStoreType) backingType
defer:(BOOL) flag;
- (NSView*)wrapperViewWithFrame:(NSRect)bounds;
- (BOOL)mayOrderOut;
@end
@interface SlidingWindow ()
- (void)adjustWrapperView;
- (void)setWindowWidth:(NSNumber*)width;
- (void)setWindowHeight:(NSNumber*)height;
@end
@implementation SlidingWindow
@synthesize slidingEdge = _slidingEdge;
@synthesize wrapperView = _wrapperView;
- (id)initWithContentRect:(NSRect) contentRect
styleMask:(unsigned int) styleMask
backing:(NSBackingStoreType) backingType
defer:(BOOL) flag
{
if ((self = [super initWithContentRect:contentRect
styleMask:NSBorderlessWindowMask
backing:backingType
defer:flag])) {
/* May want to setup some other options,
like transparent background or something */
[self setSlidingEdge:CGRectMaxYEdge];
[self setHidesOnDeactivate:YES];
[self setCollectionBehavior:NSWindowCollectionBehaviorCanJoinAllSpaces];
}
return self;
}
- (NSView*)wrapperViewWithFrame:(NSRect)bounds
{
return [[[NSView alloc] initWithFrame:bounds] autorelease];
}
- (void)adjustWrapperView
{
if (self.wrapperView == nil) {
NSRect frame = [self frame];
NSRect bounds = NSMakeRect(0, 0, frame.size.width, frame.size.height);
NSView *wrapperView = [self wrapperViewWithFrame:bounds];
NSArray *subviews = [[[[self contentView] subviews] copy] autorelease];
for (NSView *view in subviews) {
[wrapperView addSubview:view];
}
[wrapperView setAutoresizingMask:(NSViewWidthSizable | NSViewHeightSizable)];
[[self contentView] addSubview:wrapperView];
self.wrapperView = wrapperView;
}
switch (self.slidingEdge) {
case CGRectMaxXEdge:
[self.wrapperView setAutoresizingMask:(NSViewHeightSizable | NSViewMaxXMargin)];
break;
case CGRectMaxYEdge:
[self.wrapperView setAutoresizingMask:(NSViewWidthSizable | NSViewMaxYMargin)];
break;
case CGRectMinXEdge:
[self.wrapperView setAutoresizingMask:(NSViewHeightSizable | NSViewMinXMargin)];
break;
case CGRectMinYEdge:
default:
[self.wrapperView setAutoresizingMask:(NSViewWidthSizable | NSViewMinYMargin)];
}
}
- (void)makeKeyAndOrderFront:(id)sender
{
[self adjustWrapperView];
if ([self isVisible]) {
[super makeKeyAndOrderFront:sender];
}
else {
NSRect screenRect = [[NSScreen menubarScreen] visibleFrame];
NSRect windowRect = [self frame];
CGFloat x;
CGFloat y;
NSRect startWindowRect;
NSRect endWindowRect;
switch (self.slidingEdge) {
case CGRectMinXEdge:
x = 0;
y = (screenRect.size.height - windowRect.size.height) / 2 + screenRect.origin.y;
startWindowRect = NSMakeRect(x - windowRect.size.width, y, 0, windowRect.size.height);
break;
case CGRectMinYEdge:
x = (screenRect.size.width - windowRect.size.width) / 2 + screenRect.origin.x;
y = 0;
startWindowRect = NSMakeRect(x, y - windowRect.size.height, windowRect.size.width, 0);
break;
case CGRectMaxXEdge:
x = screenRect.size.width - windowRect.size.width + screenRect.origin.x;
y = (screenRect.size.height - windowRect.size.height) / 2 + screenRect.origin.y;
startWindowRect = NSMakeRect(x + windowRect.size.width, y, 0, windowRect.size.height);
break;
case CGRectMaxYEdge:
default:
x = (screenRect.size.width - windowRect.size.width) / 2 + screenRect.origin.x;
y = screenRect.size.height - windowRect.size.height + screenRect.origin.y;
startWindowRect = NSMakeRect(x, y + windowRect.size.height, windowRect.size.width, 0);
}
endWindowRect = NSMakeRect(x, y, windowRect.size.width, windowRect.size.height);
[self setFrame:startWindowRect display:NO animate:NO];
[super makeKeyAndOrderFront:sender];
[self setFrame:endWindowRect display:YES animate:YES];
[self performSelector:@selector(makeResizable)
withObject:nil
afterDelay:1];
}
}
- (void)makeResizable
{
NSView *wrapperView = self.wrapperView;
NSRect frame = [self frame];
NSRect bounds = NSMakeRect(0, 0, frame.size.width, frame.size.height);
[wrapperView setFrame:bounds];
[wrapperView setAutoresizingMask:(NSViewWidthSizable | NSViewHeightSizable)];
}
- (void)orderOut:(id)sender
{
[self adjustWrapperView];
NSRect startWindowRect = [self frame];
NSRect endWindowRect;
switch (self.slidingEdge) {
case CGRectMinXEdge:
endWindowRect = NSMakeRect(startWindowRect.origin.x,
startWindowRect.origin.y,
0,
startWindowRect.size.height);
break;
case CGRectMinYEdge:
endWindowRect = NSMakeRect(startWindowRect.origin.x,
startWindowRect.origin.y,
startWindowRect.size.width,
0);
break;
case CGRectMaxXEdge:
endWindowRect = NSMakeRect(startWindowRect.origin.x + startWindowRect.size.width,
startWindowRect.origin.y,
0,
startWindowRect.size.height);
break;
case CGRectMaxYEdge:
default:
endWindowRect = NSMakeRect(startWindowRect.origin.x,
startWindowRect.origin.y + startWindowRect.size.height,
startWindowRect.size.width,
0);
}
[self setFrame:endWindowRect display:YES animate:YES];
switch (self.slidingEdge) {
case CGRectMaxXEdge:
case CGRectMinXEdge:
if (startWindowRect.size.width > 0) {
[self performSelector:@selector(setWindowWidth:)
withObject:[NSNumber numberWithDouble:startWindowRect.size.width]
afterDelay:0];
}
break;
case CGRectMaxYEdge:
case CGRectMinYEdge:
default:
if (startWindowRect.size.height > 0) {
[self performSelector:@selector(setWindowHeight:)
withObject:[NSNumber numberWithDouble:startWindowRect.size.height]
afterDelay:0];
}
}
[super orderOut:sender];
}
- (void)setWindowWidth:(NSNumber*)width
{
NSRect startWindowRect = [self frame];
NSRect endWindowRect = NSMakeRect(startWindowRect.origin.x,
startWindowRect.origin.y,
[width doubleValue],
startWindowRect.size.height);
[self setFrame:endWindowRect display:NO animate:NO];
}
- (void)setWindowHeight:(NSNumber*)height
{
NSRect startWindowRect = [self frame];
NSRect endWindowRect = NSMakeRect(startWindowRect.origin.x,
startWindowRect.origin.y,
startWindowRect.size.width,
[height doubleValue]);
[self setFrame:endWindowRect display:NO animate:NO];
}
- (void)resignKeyWindow
{
[self orderOut:self];
[super resignKeyWindow];
}
- (BOOL)canBecomeKeyWindow
{
return YES;
}
- (void)performClose:(id)sender
{
[self close];
}
- (void)dealloc
{
[_wrapperView release], _wrapperView = nil;
[super dealloc];
}
@end
@implementation NSScreen (MenubarScreen)
+ (NSScreen*)menubarScreen
{
NSArray *screens = [self screens];
if ([screens count] > 0) {
return [screens objectAtIndex:0];
}
return nil;
}
@end
【讨论】：
@implementation 没有@interface，它不是完全正确 i> 明确其中需要包含的内容……例如，没有定义任何 slidingEdge，等等。
+ (NSScreen*)menubarScreen 的类别。我想说这不是必需的，因为您可以直接调用 [NSScreen mainScreen]，不是吗？