Re: [NSTextView firstRectForCharacterRange:] returns empty rect
Re: [NSTextView firstRectForCharacterRange:] returns empty rect
- Subject: Re: [NSTextView firstRectForCharacterRange:] returns empty rect
- From: Douglas Davidson <email@hidden>
- Date: Mon, 6 Mar 2006 09:45:10 -0800
On Mar 6, 2006, at 3:43 AM, Tristan Leblanc wrote:
I have to frame some text items.
I think about using [NSTextView firstRectForCharacterRange:]
does anyone knows how this method works?
Actually, it just returns the location of selection rect.
Width and height are always 0, no matter the range i pass to this
method...
Any guess or known bug?
Please do not use this method. This is part of the NSTextInput
protocol, designed to be used only for support of text input.
Take a look at e.g. -[NSLayoutManager
boundingRectForGlyphRange:inTextContainer:] or -[NSLayoutManager
rectArrayForCharacterRange:withinSelectedCharacterRange:inTextContainer:
rectCount:]. Keep in mind that the layout manager always uses
container coordinates, which are offset from the text view's
coordinates by the textContainerOrigin.
Here is some sample code from a previous WWDC that might be relevant:
/*
BubbleTextView.m
Copyright (c) 2003, Apple Computer, Inc., all rights reserved.
*/
/*
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.
*/
#import "BubbleTextView.h"
@implementation BubbleTextView
#define kImageExtraXDirty 20.0
#define kImageExtraYDirty 20.0
- (void)awakeFromNib {
// Set up a paragraph style with extra room between the
paragraphs for the bubble edges.
NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle
defaultParagraphStyle] mutableCopy];
[paragraphStyle setParagraphSpacingBefore:kImageExtraYDirty];
[paragraphStyle setParagraphSpacing:kImageExtraYDirty];
[self setDefaultParagraphStyle:paragraphStyle];
[self setTypingAttributes:[NSDictionary
dictionaryWithObjectsAndKeys:paragraphStyle,
NSParagraphStyleAttributeName, [NSFont userFontOfSize:24.0],
NSFontAttributeName, nil]];
// Make sure there's some extra room around the text container,
too.
[self setTextContainerInset:NSMakeSize(kImageExtraXDirty,
kImageExtraYDirty)];
[paragraphStyle release];
}
- (void)setNeedsDisplayInRect:(NSRect)rect avoidAdditionalLayout:
(BOOL)flag {
// Make sure that the extra space around each paragraph needed
for the bubble is marked as needing display.
[super setNeedsDisplayInRect:NSInsetRect(rect, -
kImageExtraXDirty, -kImageExtraYDirty) avoidAdditionalLayout:flag];
}
- (void)drawBubbleAroundTextInRect:(NSRect)rect {
// This is a significant simplification for demo purposes.
// Real bubble drawing would need to be sized in height as well
as in width.
// This three-part image drawing routine shows the basic
techniques involved.
// Implementation of the fully sizable nine-part image drawing
is left as an exercise to the reader...
NSImage *lEndCap = [NSImage imageNamed:@"BubbleL"], *rEndCap =
[NSImage imageNamed:@"BubbleR"];
NSColor *fillColor = [NSColor colorWithPatternImage:[NSImage
imageNamed:@"BubbleC"]];
NSSize imageSize = [lEndCap size];
NSPoint compositePoint;
NSRect fillRect;
rect = NSIntegralRect(rect);
compositePoint.x = NSMinX(rect) - imageSize.width;
compositePoint.y = NSMaxY(rect) + floor(((imageSize.height -
NSHeight(rect)) / 2.0) + 0.5);
[lEndCap compositeToPoint:compositePoint
operation:NSCompositeSourceOver];
compositePoint.x = NSMaxX(rect);
[rEndCap compositeToPoint:compositePoint
operation:NSCompositeSourceOver];
fillRect = NSMakeRect(NSMinX(rect), compositePoint.y -
imageSize.height, NSWidth(rect), imageSize.height);
[[NSGraphicsContext currentContext] setPatternPhase:[self
convertPoint:fillRect.origin toView:nil]];
[fillColor set];
NSRectFillUsingOperation(fillRect, NSCompositeSourceOver);
}
- (void)drawViewBackgroundInRect:(NSRect)rect {
NSLayoutManager *layoutManager = [self layoutManager];
NSPoint containerOrigin = [self textContainerOrigin];
NSRange glyphRange, charRange, paragraphCharRange,
paragraphGlyphRange, lineGlyphRange;
NSRect paragraphRect, lineUsedRect;
// Draw the background first, before the bubbles.
[super drawViewBackgroundInRect:rect];
// Convert from view to container coordinates, then to the
corresponding glyph and character ranges.
rect.origin.x -= containerOrigin.x;
rect.origin.y -= containerOrigin.y;
glyphRange = [layoutManager glyphRangeForBoundingRect:rect
inTextContainer:[self textContainer]];
charRange = [layoutManager
characterRangeForGlyphRange:glyphRange actualGlyphRange:NULL];
// Iterate through the character range, paragraph by paragraph.
for (paragraphCharRange = NSMakeRange(charRange.location, 0);
NSMaxRange(paragraphCharRange) < NSMaxRange(charRange);
paragraphCharRange = NSMakeRange(NSMaxRange(paragraphCharRange), 0)) {
// For each paragraph, find the corresponding character and
glyph ranges.
paragraphCharRange = [[[self textStorage] string]
paragraphRangeForRange:paragraphCharRange];
paragraphGlyphRange = [layoutManager
glyphRangeForCharacterRange:paragraphCharRange
actualCharacterRange:NULL];
paragraphRect = NSZeroRect;
// Iterate through the paragraph glyph range, line by line.
for (lineGlyphRange = NSMakeRange
(paragraphGlyphRange.location, 0); NSMaxRange(lineGlyphRange) <
NSMaxRange(paragraphGlyphRange); lineGlyphRange = NSMakeRange
(NSMaxRange(lineGlyphRange), 0)) {
// For each line, find the used rect and glyph range,
and add the used rect to the paragraph rect.
lineUsedRect = [layoutManager
lineFragmentUsedRectForGlyphAtIndex:lineGlyphRange.location
effectiveRange:&lineGlyphRange];
paragraphRect = NSUnionRect(paragraphRect, lineUsedRect);
}
// Convert back from container to view coordinates, then
draw the bubble.
paragraphRect.origin.x += containerOrigin.x;
paragraphRect.origin.y += containerOrigin.y;
[self drawBubbleAroundTextInRect:paragraphRect];
}
}
@end
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