adium / Source / AIClickThroughThemeDocumentButton.m

//
//  AIClickThroughThemeDocumentButton.m
//  Adium
//
//  Created by Evan Schoenberg on 12/26/05.
//

#import "AIClickThroughThemeDocumentButton.h"

/*!
 * @class AIClickThroughThemeDocumentButton
 * @brief This NSThemeDocumentButton subclass makes the window move when it is dragged.
 *
 * Normally, an NSThemeDocumentButton eats mouseDown: and mouseDragged: events for its own nefarious
 * purposes, namely drag & drop of the window's document to other locations.  We want to utilize the display
 * of a document button, but we don't have an associated document, so dragging appears to just do nothing.
 *
 * With this replacement class, dragging the document button properly moves the window.  The code is, for
 * reference, a stripped down version of the code powering AIBorderlessWindow's dragging movements.
 *
 * On mouse down, the window's frame is noted; deltas as the mouse moves are used to determine the window's
 * own movements.
 */
@implementation AIClickThroughThemeDocumentButton

/*!
 * @brief Mouse dragged
 */
- (void)mouseDragged:(NSEvent *)theEvent
{
        NSWindow        *window = [self window];
        NSPoint         currentLocation, newOrigin;
        NSRect          newWindowFrame;
        
        /* If we get here and aren't yet in a left mouse event, which can happen if the user began dragging while
         * a contextual menu is showing, start off from the right position by getting our originalMouseLocation.
         */             
        if (!inLeftMouseEvent) {
                //Grab the mouse location in global coordinates
                originalMouseLocation = [window convertBaseToScreen:[theEvent locationInWindow]];
                windowFrame = [window frame];
                inLeftMouseEvent = YES;         
        }
        
        newOrigin = windowFrame.origin;
        newWindowFrame = windowFrame;
        
        //Grab the current mouse location to compare with the location of the mouse when the drag started (stored in mouseDown:)
        currentLocation = [NSEvent mouseLocation];
        newOrigin.x += (currentLocation.x - originalMouseLocation.x);
        newOrigin.y += currentLocation.y - originalMouseLocation.y;

        newWindowFrame.origin = newOrigin;

        [[NSNotificationCenter defaultCenter] postNotificationName:NSWindowWillMoveNotification object:window];
        [window setFrameOrigin:newWindowFrame.origin];
        [[NSNotificationCenter defaultCenter] postNotificationName:NSWindowDidMoveNotification object:window];          
}

/*!
 * @brief Mouse down
 *
 * We start tracking the a drag operation here when the user first clicks the mouse without command presed
 * to establish the initial location.
 */
- (void)mouseDown:(NSEvent *)theEvent
{
        NSWindow        *window = [self window];

        //grab the mouse location in global coordinates
        originalMouseLocation = [window convertBaseToScreen:[theEvent locationInWindow]];
        windowFrame = [window frame];
        inLeftMouseEvent = YES;
}

/*!
 * @brief Mouse up
 */
- (void)mouseUp:(NSEvent *)theEvent
{
        inLeftMouseEvent = NO;
}

/*!
 * @brief HACK: When deallocing, we crash in setRepresentedFilename presumably because of an NSCoder failure in AIMesageWindow
 */
- (void)setRepresentedFilename:(NSString *)inFilename
{
        //Empty
}

/*!
 * @brief Don't allow the document button to try to show a popup menu
 *
 * If we do, we'll crash, since there shouldn't actually *be* a theem document button with no represented filename and no document.
 */
- (void)showPopup
{
        //Empty
}

@end