/*

     File: CustomWindow.m

 Abstract: Subclass of NSWindow with a custom shape and transparency. Since the window will not have

 a title bar, -mouseDown: and -mouseDragged: are overriden so the window can be moved by dragging

 its content area.

  Version: 1.5

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 */

#import "CustomWindow.h"

#import <AppKit/AppKit.h>

@implementation CustomWindow

@synthesize initialLocation;

/*

 In Interface Builder, the class for the window is set to this subclass. Overriding the initializer

 provides a mechanism for controlling how objects of this class are created.

 */

- (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];

    }

    return self;

}

/*

 Custom windows that use the NSBorderlessWindowMask can't become key by default. Override this method

 so that controls in this window will be enabled.

 */

- (BOOL)canBecomeKeyWindow {

    return YES;

}

/*

 Start tracking a potential drag operation here when the user first clicks the mouse, to establish

 the initial location.

 */

- (void)mouseDown:(NSEvent *)theEvent {

    // Get the mouse location in window coordinates.

    self.initialLocation = [theEvent locationInWindow];

}

/*

 Once the user starts dragging the mouse, move the window with it. The window has no title bar for

 the user to drag (so we have to implement dragging ourselves)

 */

- (void)mouseDragged:(NSEvent *)theEvent {

    NSRect screenVisibleFrame = [[NSScreen mainScreen] visibleFrame];

    NSRect windowFrame = [self frame];

    NSPoint newOrigin = windowFrame.origin;

    // Get the mouse location in window coordinates.

    NSPoint currentLocation = [theEvent locationInWindow];

    // Update the origin with the difference between the new mouse location and the old mouse location.

    newOrigin.x += (currentLocation.x - initialLocation.x);

    newOrigin.y += (currentLocation.y - initialLocation.y);

    // Don't let window get dragged up under the menu bar

    if ((newOrigin.y + windowFrame.size.height) > (screenVisibleFrame.origin.y + screenVisibleFrame.size.height)) {

        newOrigin.y = screenVisibleFrame.origin.y + (screenVisibleFrame.size.height - windowFrame.size.height);

    }

    // Move the window to the new location

    [self setFrameOrigin:newOrigin];

}

@end