I have the following NSScroller subclass that creates a scroll bar with a rounded white knob and no arrows/slot (background):
#implementation IGScrollerVertical
- (void)drawKnob
{
NSRect knobRect = [self rectForPart:NSScrollerKnob];
NSRect newRect = NSMakeRect(knobRect.origin.x, knobRect.origin.y, knobRect.size.width - 4, knobRect.size.height);
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:newRect xRadius:7 yRadius:7];
[[NSColor whiteColor] set];
[path fill];
}
- (void)drawArrow:(NSScrollerArrow)arrow highlightPart:(int)flag
{
// We don't want arrows
}
- (void)drawKnobSlotInRect:(NSRect)rect highlight:(BOOL)highlight
{
// Don't want a knob background
}
#end
This all works fine, except there is a noticable lag when I use the scroller. See this video:
http://twitvid.com/70E7C
I'm confused as to what I'm doing wrong, any suggestions?
Fixed the issue, just had to fill the rect in drawKnobSlotInRect:
Related
I have an NSView with a custom subclass that draws a grid of rounded rectangles inside it. This NSView was placed with interface builder and on top of it I have some NSButtons.
The problem is that sometimes when the view is re-drawn (ie, when i click a button on top of it) then it re-draws over some of the buttons that are meant to stay on top. When this happens only the smaller rounded rects appear over the buttons though, not the background one that is drawn before the loop.
Here is the code form drawRect:
[NSGraphicsContext saveGraphicsState];
NSBezierPath *path = [NSBezierPath bezierPathWithRect:self.bounds];
[[NSColor grayColor] set];
[path fill];
[NSGraphicsContext restoreGraphicsState];
for( int r = 0; r < 15; r++ ){
for( int c = 0; c < 15; c++ ) {
[NSGraphicsContext saveGraphicsState];
// Draw shape
NSRect rect = NSMakeRect(20 * c, 20 * r, 15, 15);
NSBezierPath *roundedRect = [NSBezierPath bezierPathWithRoundedRect: rect xRadius:1 yRadius:1];
[roundedRect setClip];
// Fill
[[NSColor colorWithCalibratedHue:0 saturation:0 brightness:0.3 alpha:1] set];
[roundedRect fill];
// Stroke
[[NSColor colorWithCalibratedHue:0 saturation:0 brightness:0.5 alpha:1] set];
[roundedRect setLineWidth:2.0];
[roundedRect stroke];
[NSGraphicsContext restoreGraphicsState];
}
}
Here's a screenshot:
Update: Simplified the code, added a screenshot.
the mac has issues with overlapping sibling views. it didn't work before.... 10.6 and it still doesnt work quite often.
use a proper superview / subview hierachy
OK I just managed to solve this by removing the setClip and finding a different way to draw the inner stroke.
I'm sure it's possible to solve this while still using setClip but this solution worked fine for me this time.
I have a NSTextView and here's the normal size of the scroller:
And here's what happens when I hover the scroller of the textview:
However, I don't want to have this 'expand' effect. How can I remove it? I've tried to search around on how to perform this, but I couldn't find anything. I just want to have the regular scroller size (the thinner one) all the time, even if the user hovers it. Is this possible?
Thanks
I recommend subclassing the NSScroller and override – drawArrow:highlight: / – drawKnobSlotInRect:highlight: / – drawKnob methods so you have a stable scroller appearance.
P.S. Don't forget to set your new scroller class in XIB-file for the scrollers.
UPDATE
Here is the sample code:
- (void)drawKnob
{
// call the default implementation for Overlay Scrollers
if (self.scrollerStyle == NSScrollerStyleOverlay)
{
[super drawKnob];
return;
}
if (_style == NSScrollerKnobStyleLight || _style == NSScrollerKnobStyleDefault)
[[NSColor colorWithCalibratedWhite:1.0 alpha:0.8] setFill];
else [[NSColor colorWithCalibratedWhite:0 alpha:0.4] setFill];
// Note: you can specify the rect with fixed width here
NSRect knobRect = [self rectForPart:NSScrollerKnob];
// VERTICAL SCROLLER
NSInteger fullWidth = knobRect.size.width;
knobRect.size.width = round(knobRect.size.width/2);
knobRect.origin.x += (NSInteger)((fullWidth - knobRect.size.width)/2);
// draw...
NSBezierPath * thePath = [NSBezierPath bezierPath];
[thePath appendBezierPathWithRoundedRect:knobRect xRadius:4 yRadius:4];
[thePath fill];
}
//---------------------------------------------------------------
- (void)drawKnobSlotInRect:(NSRect)slotRect highlight:(BOOL)flag
{
// call the default implementation for Overlay Scrollers
// draw nothing for usual
if (self.scrollerStyle == NSScrollerStyleOverlay)
{
[super drawKnobSlotInRect:slotRect highlight:flag];
}
}
//---------------------------------------------------------------
- (void)drawArrow:(NSScrollerArrow)whichArrow highlight:(BOOL)flag
{
// call the default implementation for Overlay Scrollers
// draw nothing for usual
if (self.scrollerStyle == NSScrollerStyleOverlay)
{
[super drawArrow:whichArrow highlight:flag];
}
}
I don't know what exact style you want, but this category might help you.
#implementation NSScrollView (SetScrollStyle)
- (void) setHidingScroll
{
[self setScrollerStyle:NSScrollerStyleOverlay];
[[self verticalScroller] setControlSize: NSSmallControlSize];
[[self verticalScroller] setKnobStyle:NSScrollerKnobStyleDark];
[self setScrollerKnobStyle:NSScrollerKnobStyleDark];
[[self verticalScroller] setScrollerStyle:NSScrollerStyleOverlay];
}
and usage
[scrollView setHidingScroll];
I'm trying to learn CoreGraphics and I have encountered a strange behavior.
I draw a rectangle and in it I draw given amount of diamonds,the shapes can be drawn with different filling (empty, filled and with stripes) my draw rect function looks like this:
- (void)drawRect:(CGRect)rect
{
UIBezierPath* roundedRect = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:9.0];
//don't draw where the round corners "cut" the rectangle
[roundedRect addClip];
//set a white background
[[UIColor whiteColor] setFill];
UIRectFill(self.bounds);
//set a black frame
[[UIColor darkGrayColor] setStroke];
[roundedRect stroke];
self.shade = STRIPED;
self.color = [UIColor greenColor];
self.number = 3;
rectOffset = self.bounds.size.width / (self.number * 2);
[self drawDiamondNumberOfTimes:self.number startOrigin:self.bounds.origin];
}
drawDiamondNumberOfTimes:startOrigin: is a recursive function that calculates the rectangle in which the shape will be drawing and draw the diamond boundaries using stroke
- (void) drawDiamondNumberOfTimes:(int) p_times startOrigin:(CGPoint) p_origin
{
if( p_times > 0)
{
CGRect drawArea;
drawArea.origin = CGPointMake(p_origin.x + rectOffset-shapeSize.width/2, self.bounds.size.height/4);
drawArea.size = shapeSize;
UIBezierPath *diamond = [[UIBezierPath alloc] init];
[diamond moveToPoint:CGPointMake(drawArea.origin.x, drawArea.origin.y+ shapeSize.height/2)];
[diamond addLineToPoint:CGPointMake(drawArea.origin.x+shapeSize.width/2, drawArea.origin.y)];
[diamond addLineToPoint:CGPointMake(drawArea.origin.x+shapeSize.width, drawArea.origin.y+ shapeSize.height/2)];
[diamond addLineToPoint:CGPointMake(drawArea.origin.x+shapeSize.width/2, drawArea.origin.y+ shapeSize.height)];
[diamond closePath];
[self.color setStroke];
[diamond stroke];
[self drawShadeOfDraw:diamond atRect:drawArea];
drawArea.origin.x += rectOffset + shapeSize.width/2;
[self drawDiamondNumberOfTimes:p_times-1 startOrigin:drawArea.origin ];
}
}
drawShadeOfDraw:atRect: set the different filling, where the strange behavior occurs.
With empty and solid fills it works perfect but with stripes, if I write [p_symbol addClip] then I get always one diamond striped even if self.number is set to 2 or 3. Without [p_symbol addClip] I get the correct number of diamonds but, of course, the stripes are all over the rectangle, here is the code for drawShadeOfDraw:atRect:
- (void)drawShadeOfDraw:(UIBezierPath*)p_symbol atRect:(CGRect)p_drawArea
{
switch (self.shade)
{
case STRIPED:
{
[p_symbol addClip];
for( int y = p_drawArea.origin.y; y < p_drawArea.origin.y+ p_drawArea.size.height; y+= 6)
{
[p_symbol moveToPoint:CGPointMake(p_drawArea.origin.x, y)];
[p_symbol addLineToPoint:CGPointMake(p_drawArea.origin.x+shapeSize.width, y)];
[self.color setStroke];
[p_symbol stroke];
}
break;
}
case SOLID:
{
[self.color setFill];
[p_symbol fill];
break;
}
default:
{
break;
}
}
}
Here are some images:
What am I doing wrong?
Adding to the clip is semi-permanent. Once the clipping area has been "reduced", you can't grow it again, per se. You can only restore it to a previous state. To do that you call CGContextSaveGState() before setting up context state (including clipping), do some drawing with that state, and then call CGContextRestoreGState() afterward to restore the context state to what it was before.
So, I suggest that you bracket your two methods with calls to save and restore the context state. Use UIGraphicsGetCurrentContext() to get a reference to the current context.
I'm trying to make a transparent NSWindow with a rounded view in there.
I'm trying to have a rounded view with a transparent window.
This is what it looks like now: (see the little dots in the corners)
Here's another example with the border radius set to 10px (set in NSView drawRect):
I am using code from this Apple sample: https://developer.apple.com/library/mac/#samplecode/RoundTransparentWindow/Introduction/Intro.html
Specifically this method in my NSWindow subclass:
- (id)initWithContentRect:(NSRect)contentRect
styleMask:(NSUInteger)aStyle
backing:(NSBackingStoreType)bufferingType
defer:(BOOL)flag {
// Using NSBorderlessWindowMask results in a window without a title bar.
self = [super initWithContentRect:contentRect styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:NO];
if (self != nil) {
// Start with no transparency for all drawing into the window
[self setAlphaValue:1.0];
// Turn off opacity so that the parts of the window that are not drawn into are transparent.
[self setOpaque:NO];
[self setBackgroundColor:[NSColor clearColor]];
}
return self;
}
And this in my NSView subclass:
- (void)drawRect:(NSRect)dirtyRect
{
[[NSColor redColor] set];
NSBezierPath* thePath = [NSBezierPath bezierPath];
[thePath appendBezierPathWithRoundedRect:dirtyRect xRadius:3 yRadius:3];
[thePath fill];
}
Can anyone tell me what I'm missing here?
Thanks.
Are you looking for something like the following, where there's a red outline (stroke), but the center area is transparent?
If so, to achieve that, I used the following code:
- (void)drawRect:(NSRect)frame {
frame = NSInsetRect(self.frame, 3.0, 3.0);
[NSBezierPath setDefaultLineWidth:6.0];
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:frame
xRadius:6.0 yRadius:6.0];
[[NSColor redColor] set];
[path stroke];
}
If that's what you're looking for, you can probably use that as a starting point. You'll want to make sure that you inset the frame rect one half of the stroke line width, so as to avoid the problem with clipping the corners like you were seeing.
Not sure if this is what you are looking for but there is a great class by Matt Gemmell called MAAttachedWindow and can be found here: http://mattgemmell.com/2007/10/03/maattachedwindow-nswindow-subclass/
It's a little older but still works great for me when I need to do a 'floating' popup window and configure transparency, border radii, and even add a small arrow for context if desired. I use it all the time.
I want replicate the effect obtained by the following CSS code:
background: white url(./img/background.png) no-repeat;
I've written a subclass of NSView and override drawRect in this way:
- (void)drawRect:(NSRect)dirtyRect
{
dirtyRect = [self bounds];
[[NSColor whiteColor] setFill];
NSRectFill(dirtyRect);
[[NSColor colorWithPatternImage:[NSImage imageNamed:#"background.png"]] setFill];
NSRectFill(dirtyRect);
}
(I apologize for my bad english)
Take a look at NSImage class reference. Image can be drawn with drawInRect:fromRect:operation:fraction: and also with drawAtPoint:fromRect:operation:fraction:.
So You can Use this:
[[NSImage imageNamed:#"background.png"] drawInRect:dirtyRect fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1]; // Passing NSZeroRect causes the entire image to draw.
Instead this:
[[NSColor colorWithPatternImage:[NSImage imageNamed:#"background.png"]] setFill];
NSRectFill(dirtyRect);
Just use NSImage drawInRect:fromRect:operation:fraction: to draw your image in the view instead of filling your rect with a pattern color.