Please keep in mind that I'm a really newbie Cocoa developer
Scenario: I've a search the when reaches the end of document restarts from begin, a so called "wrap around".
When I do the wrap I want to show a window that flashes on screen for some time (one second??) like and OSD (On Screen Display) control window, TextWrangler and XCode do that when text search restarts from the begin.
How can I implement a similar window?
Implementing a view to do this would be relatively simple. The following code in an NSView subclass would display a partially transparent rounded rect which ignores events when placed in a window.
- (void)drawRect:(NSRect)dirtyRect {
[[NSColor colorWithDeviceWhite:0 alpha:.7] set];
[[NSBezierPath bezierPathWithRoundedRect:self.bounds xRadius:10 yRadius:10] fill];
//Additional drawing
}
- (NSView *)hitTest:(NSPoint)aPoint {
return nil;
}
- (BOOL)acceptsFirstResponder {
return NO;
}
- (BOOL)isOpaque {
return NO;
}
If you do want to do this in a window, you will need to create a borderless, non-opaque window and set this as the content view. Also, you will need to have the view fill it's bounds with a clear color at the start of the drawRect: method.
//Create and display window
NSPanel *panel = [[NSPanel alloc] initWithFrame:NSMakeRect(0,0,300,200) styleMask:NSBorderlessWindowMask|NSNonactivatingPanelMask backing:NSBackingStoreBuffered defer:YES];
[panel setOpaque:NO];
MyViewSubview *view = [MyViewSubview new];
[panel setContentView:view];
[view release];
[p setLevel:NSScreenSaverWindowLevel];
[p orderFront:nil];
//Add these two lines to the beginning of the drawRect: method
[[NSColor clearColor set];
NSRectFill(self.bounds);
However, this window will intercept events and I have not been able to disable this using standard methods.
To fade the view, check out NSViewAnimation, or use an NSTimer object and do it manually.
Related
I have created a secondary NSViewController to create a progress indicator "popup". The reason for this is that the software has to interact with some hardware and some of the functions take the device a few seconds to respond. So being thoughtful of the end user I have a NSViewController that has a NSView (that is black and semi-transparent) and then a message/progress bar on top. This is added to the window using addSubView.
Everything works great except when the screen has a NSTextField in it. The popup shows but the NSTextField is drawn on top. What is this?
The view code I used for drawing semi-transparent:
#implementation ConnectingView
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code here.
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect
{
[super drawRect:dirtyRect];
// Drawing code here.
CGContextRef context = (CGContextRef) [[NSGraphicsContext currentContext] graphicsPort];
CGContextSetRGBFillColor(context, 0.227,0.251,0.337,0.8);
CGContextFillRect(context, NSRectToCGRect(dirtyRect));
}
#end
The code I use to show the progress view
-(void) showProgressWithMessage:(NSString *) message andIsIndet:(BOOL) indet
{
connectingView = [[ConnectingViewController alloc] init];
[self.view.window.contentView addSubview:connectingView.view];
connectingView.view.frame = ((NSView*)self.view.window.contentView).bounds;
[connectingView changeProgressLabel:message];
if (indet)
[connectingView makeProgressBar:NO];
}
Is there a better way to add the subview or to tell the NSTextFields I don't want them to be drawn on top?
Thanks!
So Setting [self setWantsLayer] to my custom NSViews sort of worked however there are a lot of redraw issues (white borders, and backgrounds). A NSPopover may be better in some instances however I was going for "locked down" approach where the interface is unreachable until it finishes (or times out).
What worked for me was to go to the instance of my NSView, select the window in Interface Builder, then go to layers (far right on properties view) and select my view under "Core Animation Layer".
I have an NSTextField in a container:
[textField setFrameOrigin:NSMakePoint(0, -t.frame.size.height)];
content = [[NSView alloc] init];
[content setWantLayer:YES]
content.layer=[CALayer layer];
[content addSubview:textField];
[content scaleUnitSquareToSize:NSMakeSize(1, -1)];
content.frame=textField.frame;
content.layer.backgroundColor=textBGColor.CGColor;
The container itself is located in a view with
[view scaleUnitSquareToSize:NSMakeSize(1, -1)];
This is all for obtaining a top left origin for the TextField and it works great, the only problem consist in the InsertionPoint not drawing (at least not in the visible frame).
I presume the InsertionPoint is either not Scaled or translated with the TextField. Other possibility is that InsertionPoint can't be drawn in a layer backed View.
Is there a way to display the InsertionPoint cursor ?
EDIT
After trying all the possibilities out, it seems the InsertionPoint (and the focusRing) are not drawing because of its frame being positioned out of the superviews bounds and its dirtyDrawRect. Is there a way to remove the clipping of an NSView ? I need to be able to place my TextField on every absolute position possible.
I found a way through: implementing the drawing myself.
1) giving a custom TextView as Editor for the window.
- (id)windowWillReturnFieldEditor:(NSWindow *)sender toObject:(id)anObject
{
if (!myCustomFieldEditor) {
myCustomFieldEditor = [[TextView alloc] init];
[myCustomFieldEditor setFieldEditor:YES];
}
return myCustomFieldEditor;
}
2) Overiding the drawInsertionPoint method in the custom TextView class.
-(void)drawInsertionPointInRect:(NSRect)rect color:(NSColor *)color turnedOn:(BOOL)flag{
[color set];
NSRectFill(rect);
[super drawInsertionPointInRect:rect color:color turnedOn:flag];
}
For insertion point just make your textfield to first responder.
[myTextField becomeFirstResponder];
I want to draw on the screen with a transparent background, so that everything (e.g. open applications are still visible).
In windowDidLoad of my custom NSWindowController i have the follwing:
[self.window setOpaque: NO];
[self.window setHasShadow:NO];
[self.window setBackgroundColor:[NSColor clearColor]];
[self.window setStyleMask:NSBorderlessWindowMask];
My custom NSWindow overrides canBecomeKeyWindow
- (BOOL)canBecomeKeyWindow {
return YES;
}
My View overrides drawRect
- (void)drawRect:(NSRect)rect {
[[NSColor clearColor]set];
NSRectFill(rect);
...
}
Problem: Trying to draw by using mouse events inside of my custom view results in the view/application beneath my Window to receive these events.
It justs works when i do not set the NSWindow styleMask to NSBorderlessWindowMask or by setting the background color of the custom view to semitransparent.
[[NSColor colorWithCalibratedRed:0 green:0 blue:0 alpha:0.05] set]
How can i draw on screen with full transparency and NSBorderlessWindowMask?
Adding
[self.window setIgnoresMouseEvents:NO];
to windowDidLoad of my custom NSWindowController solved it
Several apps, including the built-in Address Book use a HUD window that is semi-transparent, with large shadowed text. I'd like to implement a similar window in my Cocoa Mac app.
Is there a free implementation of this kind of window somewhere?
If not, what is the best way to implement it?
Here's a sample project that shows how to do it:
http://github.com/NSGod/BlackBorderlessWindow
Basically, you need to create a borderless NSWindow subclass. The easiest way to do this is to set your window size and arrangement in the nib file, and then set its class to be your custom subclass. So while it will still look like a normal window in Interface Builder, at runtime it will appear as you need it to.
#implementation MDBorderlessWindow
- (id)initWithContentRect:(NSRect)contentRect
styleMask:(NSUInteger)windowStyle
backing:(NSBackingStoreType)bufferingType
defer:(BOOL)deferCreation {
if (self = [super initWithContentRect:contentRect
styleMask:NSBorderlessWindowMask
backing:NSBackingStoreBuffered defer:deferCreation]) {
[self setAlphaValue:0.75];
[self setOpaque:NO];
[self setExcludedFromWindowsMenu:NO];
}
return self;
}
The alpha value will make the window semi-transparent.
Also, you can create a custom NSView subclass that will draw a round rectangle:
#implementation MDBlackTransparentView
- (id)initWithFrame:(NSRect)frame {
if (self = [super initWithFrame:frame]) {
}
return self;
}
- (void)drawRect:(NSRect)frame {
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:frame
xRadius:6.0 yRadius:6.0];
[[NSColor blackColor] set];
[path fill];
}
#end
Like with the window, you simply set the class of the window's contentView to be your custom NSView subclass. (Use outline view mode and click the disclosure triangle to show the nested NSView inside the icon of the window in the nib file). Again, while the view will look ordinary in Interface Builder, it will look okay at runtime.
Then just place an NSTextField on top of view and set the text accordingly.
Note that, in general, borderless windows aren't easy to work with (for example, if you want to be able to drag the window around, you'll need to add that functionality back yourself). Apple has some sample code on how to allow dragging, for instance.
Thank you for sharing this code. Helped me a lot!
You may add the following line...
[self setBackgroundColor:[NSColor clearColor]];
to the init function of the window. This removes the white corners.
Im working on a drag n' drop view and found some handlers for drag and drop actions on the web. I want to make it so it turns blue when the user drags a file over the drag and drop area and gray again when they exit the drag and drop area. The issues is its not updating when you drag your mouse over it or exit it. Heres some of the code:
- (void)drawRect:(NSRect)rect
{
NSRect bounds = [self bounds];
[[NSColor grayColor] set];
[NSBezierPath fillRect:bounds];
}
- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
NSRect bounds = [self bounds];
[[NSColor blueColor] set];
[NSBezierPath fillRect:bounds];
return NSDragOperationCopy;
}
- (void)draggingExited:(id <NSDraggingInfo>)sender {
NSRect bounds = [self bounds];
[[NSColor grayColor] set];
[NSBezierPath fillRect:bounds];
}
Thanks for any help.
Are you calling [yourView: setNeedsDisplay] anywhere?
This is how you let the drawing framework know it needs to message your UIView subclass with drawRect:, so you should do it whenever things have changed. In your case, this probably means when the mouse enters or exits the drop area.
Drawing only works when a context (like a canvas for painting) is set up for you to draw into. When the framework calls -drawRect: it has set up a drawing context for you, so drawing commands like -[NSColor set] and -[NSBezierPath fillRect:] work as you expect.
Outside of -drawRect: there is usually no drawing context set up. Using drawing commands outside of -drawRect: is like waving a paintbrush in the air; there's no canvas, so no painting happens.
In 99.99% of cases, all view drawing should be kept within -drawRect: because NSView does a lot of work that you don't want to do to get the drawing context set up correctly and efficiently.
So, how do you change your view's drawing within your -draggingEntered: and -draggingExited: methods? By side effects.
You're doing the same thing in all three cases: 1) Setting a color and 2) Drawing a rectangle. The only difference is the color changes in each method. So, why not control which color you use in -drawRect: with an ivar, like so:
- (void)draggingEntered:(id <NSDraggingInfo>)sender {
drawBlueColorIvar = YES;
// ...
}
Then in -drawRect: you do this:
- (void)drawRect:(NSRect)rect {
NSColor *color = drawBlueColorIvar ? [NSColor blueColor] : [NSColor grayColor];
[color set];
[NSBezierPath fillRect:rect];
}
(Notice I didn't use [self bounds]. It is more efficient to just draw into the "dirty" rect, when possible.)
Finally, you need some way to tell the framework that your view needs to redraw when drawBlueColorIvar changes. The framework won't draw anything unless it's told it needs to. As Chris Cooper said, you do this with [self setNeedsDisplay:YES]. This should go after any place you change drawBlueColorIvar.