gecko-dev/camino/ToolTip.mm

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The contents of this file are subject to the Netscape Public License
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 * for the specific language governing rights and limitations under the
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
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 * Portions created by the Initial Developer are Copyright (C) 2002
 * the Initial Developer. All Rights Reserved.
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 * Contributor(s): Richard Schreyer
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 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#import "ToolTip.h"
#import "NSScreen+Utils.h"

@interface ToolTip (ToolTipPrivateMethods)

@end


@implementation ToolTip

- (id)init
{
	self = [super init];
	if (self) {
		mPanel = [[NSPanel alloc] initWithContentRect: NSMakeRect(0.0, 0.0, 200.0, 200.0) styleMask: NSBorderlessWindowMask backing: NSBackingStoreBuffered defer: YES];
		mTextField = [[[NSTextField alloc] initWithFrame: NSMakeRect(0.0, 0.0, 200.0, 200.0)] autorelease];
		
		[[mPanel contentView] addSubview: mTextField];
		[mPanel setHasShadow: YES];
		
		[mTextField setAutoresizingMask: NSViewWidthSizable | NSViewHeightSizable];
		[mTextField setBackgroundColor: [NSColor colorWithCalibratedRed: 1.0 green: 1.0 blue: .81 alpha: 1.0]];
		[mTextField setDrawsBackground: YES];
		[mTextField setEditable: NO];
		[mTextField setSelectable: NO];
		[mTextField setFont: [NSFont toolTipsFontOfSize: [NSFont smallSystemFontSize]]];
		[mTextField setBezeled: NO];
		[mTextField setBordered: NO];
	}
	return self;
}

- (void)dealloc
{
	[mPanel close];
	[mPanel release];
	[super dealloc];
}

- (void)showToolTipAtPoint:(NSPoint)point withString:(NSString*)string
{	
	if ([string length] == 0)
		return;
		
	NSScreen* screen = [NSScreen screenForPoint: point];
	if (!screen)
		screen = [NSScreen mainScreen];
	
	if (screen) {
		NSRect screenFrame = [screen visibleFrame];
		NSSize screenSize = screenFrame.size;
		NSTextView* textView = [[NSTextView alloc] initWithFrame: screenFrame];
		
		//  find out how large the tooltip needs to be
		
		[textView setString: string];
    [textView setMinSize: NSMakeSize(0.0, 0.0)];
		[textView setMaxSize: screenSize];
		[textView setVerticallyResizable: YES];
		[textView setHorizontallyResizable: YES];
		[textView setFont: [NSFont toolTipsFontOfSize: [NSFont smallSystemFontSize]]];
		[textView sizeToFit];
		NSSize textSize = NSMakeSize( ceil( NSWidth([textView frame]) ), ceil( NSHeight([textView frame]) ) );
		
		//  set up the panel
		
		[mTextField setStringValue: string];
		[mPanel setContentSize: textSize];

		// the given point is right where the mouse pointer is.  We want the tooltip's
		// top left corner somewhere below that, but not if that'll put it off the monitor. There
    // is no way that we can go off the top of the monitor because cocoa won't let us position a window
    // that way
    const int kVOffset = 20;
		if ( point.y - kVOffset - textSize.height > NSMinY(screenFrame) )
      point.y -= kVOffset;
    else
      point.y += kVOffset;
		[mPanel setFrameTopLeftPoint: point];
		
		//  if it goes off the edge of the screen, shift around to put it all on the screen
		
		float amountOffScreenX = NSMaxX(screenFrame) - NSMaxX([mPanel frame]);
		if (amountOffScreenX < 0) {
			NSRect movedFrame = [mPanel frame];
			movedFrame.origin.x += amountOffScreenX;
			[mPanel setFrame: movedFrame display: NO];
		}
				
		//  show the panel
		[mPanel orderFront: nil];
	}
}

- (void)closeToolTip
{
	[mPanel close];
}

@end