NSView scottc@net-community.com far@ix.netcom.com ovidiu@net-community.com richard@brainstorm.co.uk The view class which encapsulates all drawing functionality (C) 1996 Free Software Foundation, Inc. NSView

NSView is an abstract class which provides facilities for drawing in a window and receiving events. It is the superclass of many of the visual elements of the GUI.

In order to display itself, a view must be placed in a window (represented by an NSWindow object). Within the window is a hierarchy of NSViews, headed by the window's content view. Every other view in a window is a descendant of this view.

Subclasses can override drawRect: in order to implement their appearance. Other methods of NSView and NSResponder can also be overridden to handle user generated events.

AppKit/NSView.h defaultMenu focusView Return the view at the top of graphics contexts stack or nil if none is focused. acceptsFirstMouse: theEvent Returns YES if the view object will accept the first click received when in an inactive window, and NO otherwise. addCursorRect: aRect cursor: anObject addSubview: aView Adds aView as a subview of the receiver. addSubview: aView positioned: place relativeTo: otherView addToPageSetup addToolTipRect: aRect owner: anObject userData: data addTrackingRect: aRect owner: anObject userData: data assumeInside: flag adjustPageHeightNew: newBottom top: oldTop bottom: oldBottom limit: bottomLimit adjustPageWidthNew: newRight left: oldLeft right: oldRight limit: rightLimit adjustScroll: newVisible allocateGState

Tell the view to maintain a private gstate object which encapsulates all the information about drawing, such as coordinate transforms, line widths, etc. If you do not invoke this method, a gstate object is constructed each time the view is lockFocused. Allocating a private gstate may improve the performance of views that are focused a lot and have a lot of customized drawing parameters.

View subclasses should override the setUpGstate method to set these custom parameters.

ancestorSharedWithView: aView Returns self if aView is the receiver or aView is a subview of the receiver, the ancestor view shared by aView and the receiver, if any, aView if it is an ancestor of the receiver, otherwise returns nil. autoresizesSubviews autoresizingMask autoscroll: theEvent beginDocument Writes header and job information for the PostScript document. This includes at a minimum, PostScript header information. It may also include job setup information if the output is intended for a printer (i.e. not an EPS file). Most of the information for writing the header comes from the NSPrintOperation and NSPrintInfo objects associated with the current print operation. There isn't normally anything that the program needs to override at the beginning of a document, although if there is additional setup that needs to be done, you can override the NSView's methods endHeaderComments, endPrologue, beginSetup, and/or endSetup. This method calls the above methods in the listed order before or after writing the required information. For an EPS operation, the beginSetup and endSetup methods aren't used. beginPage: ordinalNum label: aString bBox: pageRect fonts: fontNames beginPageInRect: aRect atPlacement: location beginPageSetupRect: aRect placement: location beginPrologueBBox: bBox creationDate: dateCreated createdBy: anApplication fonts: fontNames forWhom: user pages: numPages title: aTitle beginSetup beginTrailer bounds boundsRotation canDraw centerScanRect: aRect convertPoint: aPoint fromView: aView convertPoint: aPoint toView: aView convertRect: aRect fromView: aView convertRect: aRect toView: aView convertSize: aSize fromView: aView convertSize: aSize toView: aView dataWithEPSInsideRect: aRect dataWithPDFInsideRect: aRect didAddSubview: subview discardCursorRects display displayIfNeeded displayIfNeededIgnoringOpacity displayIfNeededInRect: aRect displayIfNeededInRectIgnoringOpacity: aRect displayRect: rect displayRectIgnoringOpacity: aRect dragFile: filename fromRect: rect slideBack: slideFlag event: event dragImage: anImage at: viewLocation offset: initialOffset event: event pasteboard: pboard source: sourceObject slideBack: slideFlag drawPageBorderWithSize: borderSize drawRect: rect This method is invoked to handle drawing inside the view. The default NSView's implementation does nothing; subclasses might override it to draw something inside the view. Since NSView's implementation is guaranteed to be empty, you should not call super's implementation when you override it in subclasses. drawRect: is invoked when the focus has already been locked on the view; you can use arbitrary postscript functions in drawRect: to draw inside your view; the coordinate system in which you draw is the view's own coordinate system (this means for example that you should refer to the rectangle covered by the view using its bounds, and not its frame). The argument of drawRect: is the rectangle which needs to be redrawn. In a lossy implementation, you can ignore the argument and redraw the whole view; if you are aiming at performance, you may want to redraw only what is inside the rectangle which needs to be redrawn; this usually improves drawing performance considerably. drawSheetBorderWithSize: borderSize enclosingScrollView endDocument endHeaderComments endPage endPageSetup endPrologue endSetup endTrailer fax: sender frame frameRotation gState Returns an identifier that represents the view's gstate object, which is used to encapsulate drawing information about the view. Most of the time a gstate object is created from scratch when the view is focused, so if the view is not currently focused or allocateGState has not been called, then this method will heightAdjustLimit hitTest: aPoint Returns the subview, lowest in the receiver's hierarchy, which contains aPoint initWithFrame: frameRect isDescendantOf: aView Returns YES if aView is an ancestor of the receiver. isFlipped isOpaque isRotatedFromBase isRotatedOrScaledFromBase knowsPageRange: range knowsPagesFirst: firstPageNum last: lastPageNum locationOfPrintRect: aRect lockFocus lockFocusIfCanDraw menuForEvent: theEvent mouse: aPoint inRect: aRect Returns whether or not aPoint lies within aRect needsDisplay nextKeyView nextValidKeyView opaqueAncestor performKeyEquivalent: theEvent performMnemonic: aString postsBoundsChangedNotifications postsFrameChangedNotifications previousKeyView previousValidKeyView print: sender printJobTitle rectForPage: page reflectScrolledClipView: aClipView registerForDraggedTypes: types releaseGState Frees the gstate object, if there is one. Note that the next time the view is lockFocused, the gstate will be allocated again. removeAllToolTips removeCursorRect: aRect cursor: anObject removeFromSuperview

Removes the receiver from its superviews list of subviews, by invoking the superviews [ -removeSubview: ] method, and marks the rectangle that the reciever occupied in the superview as needing redisplay.

This is dangerous to use during display, since it alters the rectangles needing display.

removeFromSuperviewWithoutNeedingDisplay Removes the receiver from its superviews list of subviews, by invoking the superviews [ -removeSubview: ] method. removeSubview: aSubview

Removes the view from the receivers list of subviews and from the responder chain.

Also invokes [aView -viewWillMoveToWindow: nil] to handle removal of aView (and recursively, its children) from its window - performing tidyup by invalidating cursor rects etc.

removeToolTip: tag removeTrackingRect: tag renewGState Invalidates the view's gstate object so it will be set up again using setUpGState the next time the view is focused. replaceSubview: oldView with: newView Removes oldView from the receiver and places newView in its place. resetCursorRects resizeSubviewsWithOldSize: oldSize resizeWithOldSuperviewSize: oldSize rotateByAngle: angle scaleUnitSquareToSize: newSize scrollClipView: aClipView toPoint: aPoint scrollPoint: aPoint scrollRect: aRect by: delta scrollRectToVisible: aRect setAutoresizesSubviews: flag setAutoresizingMask: mask setBounds: aRect setBoundsOrigin: newOrigin setBoundsRotation: angle setBoundsSize: newSize setFrame: frameRect setFrameOrigin: newOrigin setFrameRotation: angle setFrameSize: newSize setNeedsDisplay: flag setNeedsDisplayInRect: rect setNextKeyView: aView setPostsBoundsChangedNotifications: flag setPostsFrameChangedNotifications: flag setPreviousKeyView: aView setToolTip: string setUpGState shouldDelayWindowOrderingForEvent: anEvent shouldDrawColor sortSubviewsUsingFunction: compare context: context subviews superview tag toolTip translateOriginToPoint: point unlockFocus unregisterDraggedTypes viewDidMoveToSuperview viewDidMoveToWindow viewWillMoveToSuperview: newSuper Notifies the receiver that its superview is being changed to newSuperview. viewWillMoveToWindow: newWindow Notifies the receiver that it will now be a view of newWindow. Note, this method is also used when removing a view from a window (in which case, newWindow is nil) to let all the subviews know that they have also been removed from the window. viewWithTag: aTag visibleRect widthAdjustLimit willRemoveSubview: subview window Returns the window in which the receiver resides. writeEPSInsideRect: rect toPasteboard: pasteboard writePDFInsideRect: aRect toPasteboard: pboard Software documentation for the NSView(PrivateMethods) category AppKit/NSView.h _invalidateCoordinates _matrixFromWindow _matrixToWindow _rebuildCoordinates