pjs/gfx/public/nsWatchTask.h

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/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
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#ifndef WatchTask_h__
#define WatchTask_h__
#ifndef XP_MACOSX
#include <Retrace.h>
#endif
#include <Quickdraw.h>
#include "prtypes.h"
#include "nscore.h"
//
// class nsWatchTask
//
// A nice little class that installs/removes a VBL to set the cursor to
// the watch if we're away from the event loop for a while. Will also
// animate the watch cursor.
//
class nsWatchTask
{
public:
nsWatchTask ( ) ;
~nsWatchTask ( ) ;
// Registers the VBL task and does other various init tasks to begin
// watching for time away from the event loop. It is ok to call other
// methods on this object w/out calling Start().
NS_GFX void Start ( ) ;
// call from the main event loop
NS_GFX void EventLoopReached ( ) ;
// turn off when we know we're going into an area where it's ok
// that WNE is not called (eg, the menu code)
void Suspend ( ) { mSuspended = PR_TRUE; };
void Resume ( ) { mSuspended = PR_FALSE; };
static NS_GFX nsWatchTask& GetTask ( ) ;
private:
enum {
kRepeatInterval = 10, // check every 1/6 of a second if we should show watch (10/60)
kTicksToShowWatch = 45, // show watch if haven't seen WNE for 3/4 second (45/60)
kStepsInAnimation = 12
};
// the VBL task
static pascal void DoWatchTask(nsWatchTask* theTaskPtr) ;
#if !TARGET_CARBON
VBLTask mTask; // this must be first!!
#endif
long mChecksum; // 'mozz' to validate we have real data at interrupt time (not needed?)
void* mSelf; // so we can get back to |this| from the static routine
long mTicks; // last time the event loop was hit
Cursor mWatchCursor; // the watch cursor
PRPackedBool mBusy; // are we currently spinning the cursor?
PRPackedBool mSuspended; // set if we've temporarily suspended operation
PRPackedBool mInstallSucceeded; // did we succeed in installing the task? (used in dtor)
short mAnimation; // stage of animation
};
#endif