NSSlider responding to superview's drawRect
Hi All, This is something that I haven't seen before. I have a custom view that inherits from NSView directly and just draws a gradient background. In IB I've placed an NSSlider on the view which works fine. The problem comes when drawRect in my custom view is invoked, I draw the gradient and a 1px line at the top of the view, but the line also gets draw just above the NSSlider! logging shows the following 1) resize window - drawRect is called and the line above the slider disappears 2) move slider - drawRect is called from my gradient view but with the frame of the slider. The line then appears. Is this a known issue with NSSlider and a custom view or have I missed an idiosyncracy of NSControls. Thanks in adavnce, Jonathan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: NSSlider responding to superview's drawRect
Check the code that draws the 1-pixel line. It should be calculating coordinates of the line based on the view's bounds rectangle, not the rectangle that is passed to drawRect:. --Andy On Jun 10, 2008, at 11:51 AM, Jonathan Dann wrote: Hi All, This is something that I haven't seen before. I have a custom view that inherits from NSView directly and just draws a gradient background. In IB I've placed an NSSlider on the view which works fine. The problem comes when drawRect in my custom view is invoked, I draw the gradient and a 1px line at the top of the view, but the line also gets draw just above the NSSlider! logging shows the following 1) resize window - drawRect is called and the line above the slider disappears 2) move slider - drawRect is called from my gradient view but with the frame of the slider. The line then appears. Is this a known issue with NSSlider and a custom view or have I missed an idiosyncracy of NSControls. Thanks in adavnce, Jonathan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: NSSlider responding to superview's drawRect
You're probably filling your gradient into the rect passed in drawRect. That rectangle just represents the dirty part of your view. If you had a solid color to draw, you could just fill the rect, but with a gradient you will get your gradient, top to bottom, within this possibly small rect within your view. Try drawing the gradient into [self bounds] instead. This describes the location of the entire view in its own coordinate system. -Ken On Jun 10, 2008, at 8:51 AM, Jonathan Dann <[EMAIL PROTECTED]> wrote: Hi All, This is something that I haven't seen before. I have a custom view that inherits from NSView directly and just draws a gradient background. In IB I've placed an NSSlider on the view which works fine. The problem comes when drawRect in my custom view is invoked, I draw the gradient and a 1px line at the top of the view, but the line also gets draw just above the NSSlider! logging shows the following 1) resize window - drawRect is called and the line above the slider disappears 2) move slider - drawRect is called from my gradient view but with the frame of the slider. The line then appears. Is this a known issue with NSSlider and a custom view or have I missed an idiosyncracy of NSControls. Thanks in adavnce, Jonathan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/kenferry%40gmail.com This email sent to [EMAIL PROTECTED] ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: NSSlider responding to superview's drawRect
On 10 Jun 2008, at 17:05, Ken Ferry wrote: You're probably filling your gradient into the rect passed in drawRect. That rectangle just represents the dirty part of your view. If you had a solid color to draw, you could just fill the rect, but with a gradient you will get your gradient, top to bottom, within this possibly small rect within your view. Try drawing the gradient into [self bounds] instead. This describes the location of the entire view in its own coordinate system. On 10 Jun 2008, at 17:03, Andy Lee wrote: Check the code that draws the 1-pixel line. It should be calculating coordinates of the line based on the view's bounds rectangle, not the rectangle that is passed to drawRect:. --Andy Thanks to you both, you're absolutely correct! Works like a charm now. I'd like to be able to change the fill of my view depending on whether the application is active or not. The only problem is -drawRect isn't called when the application becomes inactive, is there a notification I can register for? In all my NSControl subclassing -drawRect is called on both become active and deactivating. Thanks again for your help, that subtlety has never come to light until now. Jonathan smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: NSSlider responding to superview's drawRect
This is normally what I have to do as well, but is there a more optimized way to achieve the goal of drawing only the rect that needs redrawing? -- m-s On 10 Jun, 2008, at 12:05, Ken Ferry wrote: You're probably filling your gradient into the rect passed in drawRect. That rectangle just represents the dirty part of your view. If you had a solid color to draw, you could just fill the rect, but with a gradient you will get your gradient, top to bottom, within this possibly small rect within your view. Try drawing the gradient into [self bounds] instead. This describes the location of the entire view in its own coordinate system. -Ken On Jun 10, 2008, at 8:51 AM, Jonathan Dann <[EMAIL PROTECTED]> wrote: Hi All, This is something that I haven't seen before. I have a custom view that inherits from NSView directly and just draws a gradient background. In IB I've placed an NSSlider on the view which works fine. The problem comes when drawRect in my custom view is invoked, I draw the gradient and a 1px line at the top of the view, but the line also gets draw just above the NSSlider! logging shows the following 1) resize window - drawRect is called and the line above the slider disappears 2) move slider - drawRect is called from my gradient view but with the frame of the slider. The line then appears. Is this a known issue with NSSlider and a custom view or have I missed an idiosyncracy of NSControls. Thanks in adavnce, Jonathan ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/kenferry%40gmail.com This email sent to [EMAIL PROTECTED] ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/mikey-san %40bungie.org This email sent to [EMAIL PROTECTED] ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
Re: NSSlider responding to superview's drawRect
I don't think it's worth attempting. I *think* that gradients are cached in some way so trying to recalculate the gradient to span the update rect correctly is: a) going to need a fair bit of work to calculate and b) not allow caching to work efficiently. In any case, pixels that are clipped out shouldn't be being drawn anyway, so the performance gain is likely to be miniscule. G. On 11 Jun 2008, at 7:22 am, Michael Watson wrote: This is normally what I have to do as well, but is there a more optimized way to achieve the goal of drawing only the rect that needs redrawing? -- m-s On 10 Jun, 2008, at 12:05, Ken Ferry wrote: You're probably filling your gradient into the rect passed in drawRect. That rectangle just represents the dirty part of your view. If you had a solid color to draw, you could just fill the rect, but with a gradient you will get your gradient, top to bottom, within this possibly small rect within your view. Try drawing the gradient into [self bounds] instead. This describes the location of the entire view in its own coordinate system. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
