gecko-dev/widget/cocoa/nsCocoaUtils.h

295 lines
11 KiB
Objective-C

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef nsCocoaUtils_h_
#define nsCocoaUtils_h_
#import <Cocoa/Cocoa.h>
#include "nsRect.h"
#include "nsObjCExceptions.h"
#include "imgIContainer.h"
#include "nsEvent.h"
#include "npapi.h"
// Declare the backingScaleFactor method that we want to call
// on NSView/Window/Screen objects, if they recognize it.
@interface NSObject (BackingScaleFactorCategory)
- (CGFloat)backingScaleFactor;
@end
class nsIWidget;
// Used to retain a Cocoa object for the remainder of a method's execution.
class nsAutoRetainCocoaObject {
public:
nsAutoRetainCocoaObject(id anObject)
{
mObject = NS_OBJC_TRY_EXPR_ABORT([anObject retain]);
}
~nsAutoRetainCocoaObject()
{
NS_OBJC_TRY_ABORT([mObject release]);
}
private:
id mObject; // [STRONG]
};
// Provide a local autorelease pool for the remainder of a method's execution.
class nsAutoreleasePool {
public:
nsAutoreleasePool()
{
mLocalPool = [[NSAutoreleasePool alloc] init];
}
~nsAutoreleasePool()
{
[mLocalPool release];
}
private:
NSAutoreleasePool *mLocalPool;
};
@interface NSApplication (Undocumented)
// Present in all versions of OS X from (at least) 10.2.8 through 10.5.
- (BOOL)_isRunningModal;
- (BOOL)_isRunningAppModal;
// It's sometimes necessary to explicitly remove a window from the "window
// cache" in order to deactivate it. The "window cache" is an undocumented
// subsystem, all of whose methods are included in the NSWindowCache category
// of the NSApplication class (in header files generated using class-dump).
// Present in all versions of OS X from (at least) 10.2.8 through 10.5.
- (void)_removeWindowFromCache:(NSWindow *)aWindow;
// Send an event to the current Cocoa app-modal session. Present in all
// versions of OS X from (at least) 10.2.8 through 10.5.
- (void)_modalSession:(NSModalSession)aSession sendEvent:(NSEvent *)theEvent;
// Present (and documented) on OS X 10.6 and above. Not present before 10.6.
// This declaration needed to avoid compiler warnings when compiling on 10.5
// and below (or using the 10.5 SDK and below).
- (void)setHelpMenu:(NSMenu *)helpMenu;
@end
class nsCocoaUtils
{
public:
// Get the backing scale factor from an object that supports this selector
// (NSView/Window/Screen, on 10.7 or later), returning 1.0 if not supported
static CGFloat
GetBackingScaleFactor(id aObject)
{
if (HiDPIEnabled() &&
[aObject respondsToSelector:@selector(backingScaleFactor)]) {
return [aObject backingScaleFactor];
}
return 1.0;
}
// Conversions between Cocoa points and device pixels, given the backing
// scale factor from a view/window/screen.
static int32_t
CocoaPointsToDevPixels(CGFloat aPts, CGFloat aBackingScale)
{
return NSToIntRound(aPts * aBackingScale);
}
static nsIntPoint
CocoaPointsToDevPixels(const NSPoint& aPt, CGFloat aBackingScale)
{
return nsIntPoint(NSToIntRound(aPt.x * aBackingScale),
NSToIntRound(aPt.y * aBackingScale));
}
static nsIntRect
CocoaPointsToDevPixels(const NSRect& aRect, CGFloat aBackingScale)
{
return nsIntRect(NSToIntRound(aRect.origin.x * aBackingScale),
NSToIntRound(aRect.origin.y * aBackingScale),
NSToIntRound(aRect.size.width * aBackingScale),
NSToIntRound(aRect.size.height * aBackingScale));
}
static CGFloat
DevPixelsToCocoaPoints(int32_t aPixels, CGFloat aBackingScale)
{
return (CGFloat)aPixels / aBackingScale;
}
static NSPoint
DevPixelsToCocoaPoints(const nsIntPoint& aPt, CGFloat aBackingScale)
{
return NSMakePoint((CGFloat)aPt.x / aBackingScale,
(CGFloat)aPt.y / aBackingScale);
}
static NSRect
DevPixelsToCocoaPoints(const nsIntRect& aRect, CGFloat aBackingScale)
{
return NSMakeRect((CGFloat)aRect.x / aBackingScale,
(CGFloat)aRect.y / aBackingScale,
(CGFloat)aRect.width / aBackingScale,
(CGFloat)aRect.height / aBackingScale);
}
// Returns the given y coordinate, which must be in screen coordinates,
// flipped from Gecko to Cocoa or Cocoa to Gecko.
static float FlippedScreenY(float y);
// The following functions come in "DevPix" variants that work with
// backing-store (device pixel) coordinates, as well as the original
// versions that expect coordinates in Cocoa points/CSS pixels.
// The difference becomes important in HiDPI display modes, where Cocoa
// points and backing-store pixels are no longer 1:1.
// Gecko rects (nsRect) contain an origin (x,y) in a coordinate
// system with (0,0) in the top-left of the primary screen. Cocoa rects
// (NSRect) contain an origin (x,y) in a coordinate system with (0,0)
// in the bottom-left of the primary screen. Both nsRect and NSRect
// contain width/height info, with no difference in their use.
// This function does no scaling, so the Gecko coordinates are
// expected to be CSS pixels, which we treat as equal to Cocoa points.
static NSRect GeckoRectToCocoaRect(const nsIntRect &geckoRect);
// Converts aGeckoRect in dev pixels to points in Cocoa coordinates
static NSRect GeckoRectToCocoaRectDevPix(const nsIntRect &aGeckoRect,
CGFloat aBackingScale);
// See explanation for geckoRectToCocoaRect, guess what this does...
static nsIntRect CocoaRectToGeckoRect(const NSRect &cocoaRect);
static nsIntRect CocoaRectToGeckoRectDevPix(const NSRect &aCocoaRect,
CGFloat aBackingScale);
// Gives the location for the event in screen coordinates. Do not call this
// unless the window the event was originally targeted at is still alive!
// anEvent may be nil -- in that case the current mouse location is returned.
static NSPoint ScreenLocationForEvent(NSEvent* anEvent);
// Determines if an event happened over a window, whether or not the event
// is for the window. Does not take window z-order into account.
static BOOL IsEventOverWindow(NSEvent* anEvent, NSWindow* aWindow);
// Events are set up so that their coordinates refer to the window to which they
// were originally sent. If we reroute the event somewhere else, we'll have
// to get the window coordinates this way. Do not call this unless the window
// the event was originally targeted at is still alive!
static NSPoint EventLocationForWindow(NSEvent* anEvent, NSWindow* aWindow);
static BOOL IsMomentumScrollEvent(NSEvent* aEvent);
// Hides the Menu bar and the Dock. Multiple hide/show requests can be nested.
static void HideOSChromeOnScreen(bool aShouldHide, NSScreen* aScreen);
static nsIWidget* GetHiddenWindowWidget();
static void PrepareForNativeAppModalDialog();
static void CleanUpAfterNativeAppModalDialog();
// 3 utility functions to go from a frame of imgIContainer to CGImage and then to NSImage
// Convert imgIContainer -> CGImageRef, caller owns result
/** Creates a <code>CGImageRef</code> from a frame contained in an <code>imgIContainer</code>.
Copies the pixel data from the indicated frame of the <code>imgIContainer</code> into a new <code>CGImageRef</code>.
The caller owns the <code>CGImageRef</code>.
@param aFrame the frame to convert
@param aResult the resulting CGImageRef
@return NS_OK if the conversion worked, NS_ERROR_FAILURE otherwise
*/
static nsresult CreateCGImageFromSurface(gfxImageSurface *aFrame, CGImageRef *aResult);
/** Creates a Cocoa <code>NSImage</code> from a <code>CGImageRef</code>.
Copies the pixel data from the <code>CGImageRef</code> into a new <code>NSImage</code>.
The caller owns the <code>NSImage</code>.
@param aInputImage the image to convert
@param aResult the resulting NSImage
@return NS_OK if the conversion worked, NS_ERROR_FAILURE otherwise
*/
static nsresult CreateNSImageFromCGImage(CGImageRef aInputImage, NSImage **aResult);
/** Creates a Cocoa <code>NSImage</code> from a frame of an <code>imgIContainer</code>.
Combines the two methods above. The caller owns the <code>NSImage</code>.
@param aImage the image to extract a frame from
@param aWhichFrame the frame to extract (see imgIContainer FRAME_*)
@param aResult the resulting NSImage
@return NS_OK if the conversion worked, NS_ERROR_FAILURE otherwise
*/
static nsresult CreateNSImageFromImageContainer(imgIContainer *aImage, uint32_t aWhichFrame, NSImage **aResult);
/**
* Returns nsAString for aSrc.
*/
static void GetStringForNSString(const NSString *aSrc, nsAString& aDist);
/**
* Makes NSString instance for aString.
*/
static NSString* ToNSString(const nsAString& aString);
/**
* Returns NSRect for aGeckoRect.
* Just copies values between the two types; it does no coordinate-system
* conversion, so both rects must have the same coordinate origin/direction.
*/
static void GeckoRectToNSRect(const nsIntRect& aGeckoRect,
NSRect& aOutCocoaRect);
/**
* Returns Gecko rect for aCocoaRect.
* Just copies values between the two types; it does no coordinate-system
* conversion, so both rects must have the same coordinate origin/direction.
*/
static void NSRectToGeckoRect(const NSRect& aCocoaRect,
nsIntRect& aOutGeckoRect);
/**
* Makes NSEvent instance for aEventTytpe and aEvent.
*/
static NSEvent* MakeNewCocoaEventWithType(NSEventType aEventType,
NSEvent *aEvent);
/**
* Initializes aNPCocoaEvent.
*/
static void InitNPCocoaEvent(NPCocoaEvent* aNPCocoaEvent);
/**
* Initializes aPluginEvent for aCocoaEvent.
*/
static void InitPluginEvent(nsPluginEvent &aPluginEvent,
NPCocoaEvent &aCocoaEvent);
/**
* Initializes nsInputEvent for aNativeEvent or aModifiers.
*/
static void InitInputEvent(nsInputEvent &aInputEvent,
NSEvent* aNativeEvent);
static void InitInputEvent(nsInputEvent &aInputEvent,
NSUInteger aModifiers);
/**
* GetCurrentModifiers() returns Cocoa modifier flags for current state.
*/
static NSUInteger GetCurrentModifiers();
/**
* ConvertToCarbonModifier() returns carbon modifier flags for the cocoa
* modifier flags.
* NOTE: The result never includes right*Key.
*/
static UInt32 ConvertToCarbonModifier(NSUInteger aCocoaModifier);
/**
* Whether to support HiDPI rendering. For testing purposes, to be removed
* once we're comfortable with the HiDPI behavior.
*/
static bool HiDPIEnabled();
};
#endif // nsCocoaUtils_h_