TranslucentView.m

   1 //
   2 //  TranslucentView.m
   3 //
   4 //  Created by Takashi T. Hamada on Thu Nov 01 2000.
   5 //  Copyright (c) 2000,2001 Takashi T. Hamada. All rights reserved.
   6 //
   7 //  Modifications:
   8 //  bb 25.06.2002 - added acceptsFirstMouse method for click-through
   9 //  bb 26.06.2002 - removed the isOpaque method
  10 //
  11
  12 #import "TranslucentView.h"
  13
  14
  15 @implementation TranslucentView
  16
  17 //-------------------------------------------------------------
  18 //      initialization
  19 //-------------------------------------------------------------
  20 - (id)initWithFrame:(NSRect)frameRect
  21 {
  22     self = [super initWithFrame:frameRect];
  23     calBGViewRectTag = [self addTrackingRect:[self frame] owner:self userData:&ImageOpacity assumeInside:YES];
  24     theContentDrawer = nil;
  25
  26     return self;
  27 }
  28
  29
  30 //-------------------------------------------------------------
  31 //      draw translucent rectangle
  32 //-------------------------------------------------------------
  33 - (void)drawRect:(NSRect)rect
  34 {
  35     [[NSColor clearColor] set];
  36     NSRectFill( rect );
  37
  38     // draw the content
  39     if (theContentDrawer != nil)
  40         [theContentDrawer performSelector:theDrawingMethod];
  41 }
  42
  43
  44 //-------------------------------------------------------------
  45 //      is this necessary?
  46 //-------------------------------------------------------------
  47 //- (BOOL)isOpaque      { return NO; }
  48
  49
  50 //-------------------------------------------------------------
  51 //      move the window
  52 //-------------------------------------------------------------
  53 - (void)mouseDown:(NSEvent *)theEvent
  54 {
  55     BOOL                keepOn = YES;
  56     NSPoint             mouseLoc;
  57     NSPoint             globalMouseLoc;
  58     NSPoint             offsetMouseLoc;
  59     NSPoint             tempWindowLoc;
  60     NSRect              origFrame;
  61
  62     offsetMouseLoc.x = offsetMouseLoc.y = 0;    // avoid uninitialized warning
  63     origFrame = [[self window] frame];
  64     while( 1 ) {        // gee! entering into the infinity loop...
  65         mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
  66
  67         switch ([theEvent type]) {
  68             case NSLeftMouseDown:
  69                 // save the initial mouse location
  70                 offsetMouseLoc = mouseLoc;
  71                 break;
  72             case NSLeftMouseDragged:
  73                 // get the mouse location in the global coordinates
  74                 globalMouseLoc = [[self window] convertBaseToScreen:mouseLoc];
  75                 // calculate the new origin of the window
  76                 tempWindowLoc.x = (globalMouseLoc.x - offsetMouseLoc.x);
  77                 tempWindowLoc.y = (globalMouseLoc.y - offsetMouseLoc.y);
  78                 // get the window's location and size in the global coodinate system
  79                 [[self window] setFrameOrigin:tempWindowLoc];   // move and resize the window
  80                 break;
  81             case NSLeftMouseUp:
  82                 keepOn = NO;
  83                 break;
  84             default:
  85                 break;
  86         }
  87         if (keepOn == NO)
  88             break;
  89
  90         theEvent = [[self window] nextEventMatchingMask:(NSLeftMouseUpMask | NSLeftMouseDraggedMask) ];
  91      };
  92
  93     return;
  94 }
  95
  96
  97 //-------------------------------------------------------------
  98 //      set the transparency of this view
  99 //-------------------------------------------------------------
 100 - (void)setContentDrawer:(id)theDrawer method:(SEL)theMethod
 101 {
 102     theContentDrawer = theDrawer;
 103     theDrawingMethod = theMethod;
 104 }
 105
 106
 107 //-------------------------------------------------------------
 108 //      allow click-through
 109 //-------------------------------------------------------------
 110 - (BOOL)acceptsFirstMouse:(NSEvent *)theEvent
 111 {
 112     return (YES);
 113 }
 114
 115 @end