I have two NSTextViews with a shared custom NSTextStorage subclass. The textviews mirror each other contents. This works fine until I press enter. Then the second textview starts lagging or doesn't even show any new input. This happens regardless of which textview I type in.
How can I force the second textview to stay in sync with the first textview?
This is my NSTextStorage subclass.
#implementation MyTextStorage
{
NSTextStorage *_backingStore;
}
-(id) init
{
self = [super init];
if (self)
{
_backingStore = [[NSTextStorage alloc] initWithString:#""];
}
return self;
}
-(NSString *) string
{
return [_backingStore string];
}
-(NSDictionary *) attributesAtIndex:(NSUInteger) location
effectiveRange:(NSRangePointer) range
{
NSMutableDictionary *attributes = [[_backingStore attributesAtIndex:location
effectiveRange:range] mutableCopy];
if ([self displayMode] == MyTextStorageDisplayNormal)
{
[attributes setObject:[NSColor blackColor]
forKey:NSForegroundColorAttributeName];//remove syntax coloring
}
return attributes;
}
#pragma mark - editing
-(void) replaceCharactersInRange:(NSRange)range
withString:(NSString *)string
{
[_backingStore replaceCharactersInRange:range
withString:string];
[self edited:NSTextStorageEditedCharacters
range:range
changeInLength:[string length] - range.length];
}
-(void) setAttributes:(NSDictionary *) attributes
range:(NSRange) range
{
[_backingStore setAttributes:attributes
range:range];
[self edited:NSTextStorageEditedAttributes
range:range
changeInLength:0];
}
Related
How do I generate indentation marker for NSOutlineView?
I am not sure if this is an inbuilt functionality because it appears in other apps like Instruments
Update
I tried solving the problem by iterating all the children of the item that the row represents and show the marker on all children rows based on indentation level, but I faced a few problems
How to handle the case where the item has thousands of children. One simply cannot draw marker to every row as NSOutlineView would draw rows as they are displayed
When I scroll the NSOutlineView, the mouse moves out of the specified row but mouseExited is not being called. Thus the user has to manually move the mouse to reload the highlighting.
I had solved this problem but my solution looks hacky hence wanted to know if there is a better solution. And hence the question
First to receive mouseEntered: and mouseExited: events you need to setup a tracking rect using NSTrackingArea.
I would start with a subclass of NSTableRowView thats overwrites setFrame: making sure the tracking rect gets updated when the view is resize:
#interface TableRowView : NSTableRowView {
NSBox *_box;
NSTrackingArea *_trackingArea;
}
#property (weak) id owner;
#property (copy) NSDictionary<id, id> *userInfo;
#property (nonatomic) CGFloat indentation;
#property (nonatomic) BOOL indentationMarkerHidden;
#end
#implementation TableRowView
- (void)setFrame:(NSRect)frame
{
[super setFrame:frame];
if (_trackingArea) {
[self removeTrackingArea:_trackingArea];
}
_trackingArea = [[NSTrackingArea alloc] initWithRect:[self bounds] options:NSTrackingMouseEnteredAndExited|NSTrackingActiveInKeyWindow owner:[self owner] userInfo:[self userInfo]];
[self addTrackingArea:_trackingArea];
}
#end
To use the NSTableRowView subclass, implement the NSOutlineViewDelegate messages like this:
- (NSTableRowView *)outlineView:(NSOutlineView *)outlineView rowViewForItem:(id)item
{
TableRowView *view = [[TableRowView alloc] init];
view.owner = self;
view.userInfo = item;
return view;
}
With this in place you're ready to receive mouseEntered: and mouseExited: events. Use NSOutlineView levelForItem: together with indentationPerLevel to calculate the position of the marker NSBox.:
- (void)mouseEntered:(NSEvent *)event
{
id item = [event userData];
CGFloat indentation = [_outlineView levelForItem:item] * [_outlineView indentationPerLevel];
[self setIndentationMarker:indentation hidden:NO item:item];
}
- (void)mouseExited:(NSEvent *)event
{
id item = [event userData];
[self setIndentationMarker:0.0 hidden:YES item:item];
}
Now you get the NSTableRowView subclass by rowViewAtRow:makeIfNecessary: and recursively do the same for all children in your data:
- (void)setIndentationMarker:(CGFloat)indentation hidden:(BOOL)hidden item:(NSDictionary *)item
{
TableRowView *view = [_outlineView rowViewAtRow:[_outlineView rowForItem:item] makeIfNecessary:NO];
view.indentationMarkerHidden = hidden;
view.indentation = indentation;
for (NSMutableDictionary *child in [item objectForKey:#"children"]) {
[self setIndentationMarker:indentation hidden:hidden item:child];
}
}
Now layout the NSBox the NSTableRowView subclass:
#implementation TableRowView
- (instancetype)init
{
self = [super init];
if (self) {
_indentationMarkerHidden = YES;
_box = [[NSBox alloc] init];
_box.boxType = NSBoxCustom;
_box.borderWidth = 0.0;
_box.fillColor = [NSColor tertiaryLabelColor];
_box.hidden = _indentationMarkerHidden;
[self addSubview:_box];
}
return self;
}
- (void)layout
{
[super layout];
NSRect rect = [self bounds];
rect.origin.x = _indentation + 7;
rect.size.width = 10;
_box.frame = rect;
}
- (void)setIndentation:(CGFloat)indentation
{
_indentation = indentation;
[self setNeedsLayout:YES];
}
- (void)setIndentationMarkerHidden:(BOOL)indentationMarkerHidden
{
if (_indentationMarkerHidden != indentationMarkerHidden) {
_indentationMarkerHidden = indentationMarkerHidden;
_box.hidden = indentationMarkerHidden;
}
}
#end
This enough to make a basic version like here:
In building a custom NSButton, I've run into a problem handling highlight behavior. After clicking down on the button, holding, and dragging the cursor outside the button's bounds, mouseExited: and mouseEntered: events are not delivered. I understand the reason why, because in mouseDown: calling [super mouseDown:event]; will block until the click is released.
In researching this I came across this Stack Overflow post which describes the same problem. The solution noted is to add NSTrackingEnabledDuringMouseDrag to the NSTrackingArea options, which I have done, yet I continue to see this problem. I tried the other proposed solution with handling the next events in a loop, but this resulted in odd behavior. The button text color turns black on mouse down instead of highlighting the dimmed color, and it doesn't unhighlight upon releasing the mouse, it remains black.
I am using Xcode 9.3, running on macOS 10.13.4.
Here is my NSButton subclass:
#interface BorderlessButton : NSButton {
NSColor *_tempColor;
}
#property (strong, nonatomic) NSColor *color;
#end
#interface BorderlessButton ()
#property (nonatomic) BOOL pressed;
#end
#implementation BorderlessButton
- (id)init {
if (self = [super init]) {
[self setUp];
}
return self;
}
- (id)initWithFrame:(NSRect)frameRect {
if (self = [super initWithFrame:frameRect]) {
[self setUp];
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
[self setUp];
}
return self;
}
- (void)setUp {
_color = [NSColor redColor];
[self setTitle:self.title];
[self setButtonType:NSButtonTypeMomentaryChange];
[self setBordered:NO];
NSTrackingArea *area = [[NSTrackingArea alloc] initWithRect:self.bounds
options:NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways | NSTrackingEnabledDuringMouseDrag
owner:self
userInfo:nil];
[self addTrackingArea:area];
}
- (void)setTitle:(NSString *)title {
[super setTitle:title];
NSMutableAttributedString *colorTitle = [[NSMutableAttributedString alloc] initWithAttributedString:[self attributedTitle]];
[colorTitle addAttributes:#{NSFontAttributeName: self.font, NSForegroundColorAttributeName: self.color} range:NSMakeRange(0, [colorTitle length])];
[self setAttributedTitle:colorTitle];
}
- (void)setColor:(NSColor *)color {
_color = color;
[self setTitle:self.title];
}
- (void)mouseDown:(NSEvent *)event {
self.pressed = YES;
[self highlight:YES];
[super mouseDown:event]; // this blocks until released
[self mouseUp:event];
}
- (void)mouseUp:(NSEvent *)event {
self.pressed = NO;
[self highlight:NO];
[super mouseUp:event];
}
//FIXME: Not called after mouse press down and hold then exit
- (void)mouseExited:(NSEvent *)event {
if (self.pressed) {
[self highlight:NO];
}
[super mouseExited:event];
}
- (void)mouseEntered:(NSEvent *)event {
if (self.pressed) {
[self highlight:YES];
}
[super mouseEntered:event];
}
- (void)highlight:(BOOL)flag {
if (flag) {
if (self.isEnabled) {
NSColor *dimmedColor = [self dimmedColor];
_tempColor = _color;
self.color = dimmedColor;
[self setTitle:self.title];
}
} else {
if (self.isEnabled) {
self.color = _tempColor;
[self setTitle:self.title];
}
}
}
- (NSColor *)dimmedColor {
return [self.color colorWithAlphaComponent:0.5];
}
#end
I am using a Toggle button in XIB,
in AwakeFromNib :I set title and BG image of the button.
Code works very well till OSX 10.10.5 and below but on higher versions when I click on button the text gets removed.
Set attributed Title
[self.deleteButton setWantsLayer:YES];
self.deleteButton.layer.backgroundColor = [self setButtonBGColor];
[self setButtonTitleFor:self.deleteButton
toString:#"Delete"];
[self.deleteButton setLayerContentsRedrawPolicy:NSViewLayerContentsRedrawOnSetNeedsDisplay];
- (void)setButtonTitleFor:(NSButton*)button toString:(NSString*)title
{
NSAttributedString *attrString = [self getAttributedStringForString:title];
[button setAttributedTitle:attrString];
}
Any idea hat should be done.
So finally got it right
Subclassing NSButtonCell helped me out
RPButtonTextTopCell.h
#interface RPButtonTextTopCell : NSButtonCell
#end
RPButtonTextTopCell.m
#implementation RPButtonTextTopCell
-(id) init
{
self = [super init];
if (self) {
}
return self;
}
-(id) initWithCoder:(NSCoder *)decoder
{
return [super initWithCoder:decoder];
}
-(id) initTextCell:(NSString *)string
{
return [super initTextCell:string];
}
-(NSRect)titleRectForBounds:(NSRect)theRect
{
NSRect titleFrame = [super titleRectForBounds:theRect];
NSSize titleSize = [[self attributedStringValue] size];
titleFrame.origin.y = (theRect.origin.y - (theRect.size.height-titleSize.height)*0.5) + 5;
return titleFrame;
}
#end
Utilizing This Custom Class
RPButtonTextTopCell *deleteCell = [[RPButtonTextTopCell alloc] init];
deleteCell.backgroundColor = [self setNSButtonBGColor];
[self.deleteButton setCell:deleteCell];
[self setButtonTitleFor:self.deleteButton
toString:#"Delete"];
[self.deleteButton setAction:#selector(deleteButtonClicked:)];
[self.deleteButton setTarget:self];
and its solved....
I have an NSBox subclass called dragBox. I want to be able to drag it around a canvas. The code is as follows:
-(void) awakeFromNib
{
[[self superview] registerForDraggedTypes:[NSArray arrayWithObject:NSFilenamesPboardType]];
}
-(void) mouseDown:(NSEvent *)theEvent
{
[self dragImage:[[NSImage alloc] initWithContentsOfFile:#"/Users/bruce/Desktop/Untitled-1.png"] at:NSMakePoint(32, 32) offset:NSMakeSize(0,0) event:theEvent pasteboard:[NSPasteboard pasteboardWithName:NSDragPboard] source:self slideBack:YES];
}
-(NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender // validate
{
NSLog(#"Updated");
return [sender draggingSourceOperationMask];
}
-(NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
NSLog(#"Drag Entered");
return [sender draggingSourceOperationMask];
}
- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender {
NSLog(#"Move Box");
[self setFrameOrigin:[sender draggingLocation]];
return YES;
}
-(BOOL) prepareForDragOperation:(id<NSDraggingInfo>)sender
{NSLog(#"Prepared");
return YES;
}
Why isn't dragEntered being called? I have tried to use all the pboard types and such. Nothing seems to work. I have also changed the registerForDraggedTypes to just work off of the [self] view. The box is a subview of a canvas.
Bruce
I found that awakeFromNib was the wrong place to put my registerForDragTypes call since I am programmatically adding my view (i.e. not adding it via a Nib). I had to put the call into initWithFrame:
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self registerForDraggedTypes: [NSArray arrayWithObjects:NSTIFFPboardType,NSFilenamesPboardType,nil]];
}
return self;
}
Bruce,
Your Code needs to be changed in the below way. I believe that view should be registered for drag types to make the method draggingEntered to get called.
#interface NSModifiedBox : NSBox
#end
#implementation NSModifiedBox
- (void)drawRect:(NSRect)dirtyRect
{
// Drawing code here.
[self registerForDraggedTypes:
[NSArray arrayWithObjects:NSTIFFPboardType,NSFilenamesPboardType,nil]];
[super drawRect:dirtyRect];
}
- (NSDragOperation)draggingEntered:(id )sender
{
if ((NSDragOperationGeneric & [sender draggingSourceOperationMask])
== NSDragOperationGeneric)
{
return NSDragOperationGeneric;
} // end if
// not a drag we can use
return NSDragOperationNone;
}
- (BOOL)prepareForDragOperation:(id )sender
{
return YES;
}
#end
Now Drag and Drop a NSBox on the Xib and the Modify the class of NSBox to NSModifiedBox.
Set a break point to the method "draggingEntered".
Now Drag a ".png" or ".gif" file and drop on the NSModifiedBox and you see the "draggingEntered" will get invoked
Or you can check by using NSLog as well inside a "draggingEntered".
Hope my answer will help you :)
I'm making a little server app for OS X and I'm using an NSTextView to log some info about connected clients.
Whenever I need to log something I'm appending the new message to the text of the NSTextView this way:
- (void)logMessage:(NSString *)message
{
if (message) {
self.textView.string = [self.textView.string stringByAppendingFormat:#"%#\n",message];
}
}
After this I'd like the NSTextField (or maybe I should say the NSClipView that contains it) to scroll down to show the last line of its text (obviously it should scroll only if the last line is not visible yet, in fact if then new line is the first line I log it is already on the screen so there is no need to scroll down).
How can I do that programmatically?
Found solution:
- (void)logMessage:(NSString *)message
{
if (message) {
[self appendMessage:message];
}
}
- (void)appendMessage:(NSString *)message
{
NSString *messageWithNewLine = [message stringByAppendingString:#"\n"];
// Smart Scrolling
BOOL scroll = (NSMaxY(self.textView.visibleRect) == NSMaxY(self.textView.bounds));
// Append string to textview
[self.textView.textStorage appendAttributedString:[[NSAttributedString alloc]initWithString:messageWithNewLine]];
if (scroll) // Scroll to end of the textview contents
[self.textView scrollRangeToVisible: NSMakeRange(self.textView.string.length, 0)];
}
As of OS 10.6 it's as simple as nsTextView.scrollToEndOfDocument(self).
Swift 4 + 5
let smartScroll = self.textView.visibleRect.maxY == self.textView.bounds.maxY
self.textView.textStorage?.append("new text")
if smartScroll{
self.textView.scrollToEndOfDocument(self)
}
I've been messing with this for a while, because I couldn't get it to work reliably. I've finally gotten my code working, so I'd like to post it as a reply.
My solution allows you to scroll manually, while output is being added to the view. As soon as you scroll to the absolute bottom of the NSTextView, the automatic scrolling will resume (if enabled, that is).
First a category to #import this only when needed...
FSScrollToBottomExtensions.h:
#interface NSView (FSScrollToBottomExtensions)
- (float)distanceToBottom;
- (BOOL)isAtBottom;
- (void)scrollToBottom;
#end
FSScrollToBottomExtensions.m:
#implementation NSView (FSScrollToBottomExtensions)
- (float)distanceToBottom
{
NSRect visRect;
NSRect boundsRect;
visRect = [self visibleRect];
boundsRect = [self bounds];
return(NSMaxY(visRect) - NSMaxY(boundsRect));
}
// Apple's suggestion did not work for me.
- (BOOL)isAtBottom
{
return([self distanceToBottom] == 0.0);
}
// The scrollToBottom method provided by Apple seems unreliable, so I wrote this one
- (void)scrollToBottom
{
NSPoint pt;
id scrollView;
id clipView;
pt.x = 0;
pt.y = 100000000000.0;
scrollView = [self enclosingScrollView];
clipView = [scrollView contentView];
pt = [clipView constrainScrollPoint:pt];
[clipView scrollToPoint:pt];
[scrollView reflectScrolledClipView:clipView];
}
#end
... create yourself an "OutputView", which is a subclass of NSTextView:
FSOutputView.h:
#interface FSOutputView : NSTextView
{
BOOL scrollToBottomPending;
}
FSOutputView.m:
#implementation FSOutputView
- (id)setup
{
...
return(self);
}
- (id)initWithCoder:(NSCoder *)aCoder
{
return([[super initWithCoder:aCoder] setup]);
}
- (id)initWithFrame:(NSRect)aFrame textContainer:(NSTextContainer *)aTextContainer
{
return([[super initWithFrame:aFrame textContainer:aTextContainer] setup]);
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[super dealloc];
}
- (void)awakeFromNib
{
NSNotificationCenter *notificationCenter;
NSView *view;
// viewBoundsDidChange catches scrolling that happens when the caret
// moves, and scrolling caused by pressing the scrollbar arrows.
view = [self superview];
[notificationCenter addObserver:self
selector:#selector(viewBoundsDidChangeNotification:)
name:NSViewBoundsDidChangeNotification object:view];
[view setPostsBoundsChangedNotifications:YES];
// viewFrameDidChange catches scrolling that happens because text
// is inserted or deleted.
// it also catches situations, where window resizing causes changes.
[notificationCenter addObserver:self
selector:#selector(viewFrameDidChangeNotification:)
name:NSViewFrameDidChangeNotification object:self];
[self setPostsFrameChangedNotifications:YES];
}
- (void)handleScrollToBottom
{
if(scrollToBottomPending)
{
scrollToBottomPending = NO;
[self scrollToBottom];
}
}
- (void)viewBoundsDidChangeNotification:(NSNotification *)aNotification
{
[self handleScrollToBottom];
}
- (void)viewFrameDidChangeNotification:(NSNotification *)aNotification
{
[self handleScrollToBottom];
}
- (void)outputAttributedString:(NSAttributedString *)aAttributedString
flags:(int)aFlags
{
NSRange range;
BOOL wasAtBottom;
if(aAttributedString)
{
wasAtBottom = [self isAtBottom];
range = [self selectedRange];
if(aFlags & FSAppendString)
{
range = NSMakeRange([[self textStorage] length], 0);
}
if([self shouldChangeTextInRange:range
replacementString:[aAttributedString string]])
{
[[self textStorage] beginEditing];
[[self textStorage] replaceCharactersInRange:range
withAttributedString:aAttributedString];
[[self textStorage] endEditing];
}
range.location += [aAttributedString length];
range.length = 0;
if(!(aFlags & FSAppendString))
{
[self setSelectedRange:range];
}
if(wasAtBottom || (aFlags & FSForceScroll))
{
scrollToBottomPending = YES;
}
}
}
#end
... You can add a few more convenience methods to this class (I've stripped it down), so that you can output a formatted string.
- (void)outputString:(NSString *)aFormatString arguments:(va_list)aArguments attributeKey:(NSString *)aKey flags:(int)aFlags
{
NSMutableAttributedString *str;
str = [... generate attributed string from parameters ...];
[self outputAttributedString:str flags:aFlags];
}
- (void)outputLineWithFormat:(NSString *)aFormatString, ...
{
va_list args;
va_start(args, aFormatString);
[self outputString:aFormatString arguments:args attributeKey:NULL flags:FSAddNewLine];
va_end(args);
}
I have some customised NSTextView and custom input method so my option was to use:
self.scrollView.contentView.scroll(NSPoint(x: 1, y: self.textView.frame.size.height))