NSView - Revision history

Cbv: Added categories

2006-04-21T15:46:58Z

Added categories

Quineska: Fixed link

2005-08-31T22:10:09Z

Fixed link

Quineska at 22:07, 31 August 2005

2005-08-31T22:07:14Z

Stefan Urbanek: /* Dragging objects */

2005-02-16T21:18:09Z

Dragging objects

Stefan Urbanek at 21:11, 16 February 2005

2005-02-16T21:11:20Z

New page

NSView is ...

== Code chunks ==

=== Dragging objects ===

Implement the '''mouseDown:''' method:

- (void)mouseDown:(NSEvent *)event
{
NSPoint oldPoint;
NSEvent *presentEvent;
NSEventType eventType = [event type];
unsigned int eventMask = NSLeftMouseDownMask | NSLeftMouseUpMask
| NSLeftMouseDraggedMask;
NSPoint point;
float dx,dy;
NSPoint location;

point = [self convertPoint:[event locationInWindow] fromView:nil];

oldPoint = point;

do
{
while (event && eventType != NSLeftMouseUp)
{
presentEvent = event;
event = [NSApp nextEventMatchingMask: eventMask
untilDate: [NSDate distantPast]
inMode: NSEventTrackingRunLoopMode
dequeue: YES];
eventType = [event type];
}

point = [self convertPoint: [presentEvent locationInWindow]
fromView: nil];

dx = point.x - oldPoint.x;
dy = point.y - oldPoint.y;

[self scrollRectToVisible:frame];

Add code here:

//
// here move the dragged thing by: dx, dy
// ....

Then finish the loop:

[self setNeedsDisplay:YES];

oldPoint = point;

if (eventType == NSLeftMouseUp)
{
break;
}

event = [NSApp nextEventMatchingMask: eventMask
untilDate: nil
inMode: NSEventTrackingRunLoopMode
dequeue: YES];
eventType = [event type];

} while (eventType != NSLeftMouseUp);

[self setNeedsDisplay:YES];
}

← Older revision		Revision as of 15:46, 21 April 2006
Line 71:		Line 71:
	[self setNeedsDisplay:YES];		[self setNeedsDisplay:YES];
	}		}
		+
		+
		+	[[Category:AppKit]]
		+	[[Category:Snippets]]

← Older revision		Revision as of 22:10, 31 August 2005
Line 1:		Line 1:
−	NSView is an [AppKit] class. It's role as a superclass is to provide most of the core functionality and services that specific GUI classes (such as NSButton or NSMenuView) use to display/render and handle events.	+	NSView is an [[AppKit]] class. It's role as a superclass is to provide most of the core functionality and services that specific GUI classes (such as NSButton or NSMenuView) use to display/render and handle events.

	== Code chunks ==		== Code chunks ==

← Older revision		Revision as of 22:07, 31 August 2005
Line 1:		Line 1:
−	NSView is ...	+	NSView is an [AppKit] class. It's role as a superclass is to provide most of the core functionality and services that specific GUI classes (such as NSButton or NSMenuView) use to display/render and handle events.

	== Code chunks ==		== Code chunks ==

← Older revision		Revision as of 21:18, 16 February 2005
Line 4:		Line 4:

	=== Dragging objects ===		=== Dragging objects ===
		+
		+	''Note: following code can be somehow optimised by adding small 0.01s delay or something like that. If someone knows how to, please write it here.''

	Implement the '''mouseDown:''' method:		Implement the '''mouseDown:''' method: