wxWidgets/utils/framelayout/src/hintanimpl.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        No names yet.
// Purpose:     Contrib. demo
// Author:      Aleksandras Gluchovas
// Modified by:
// Created:     9/11/98
// RCS-ID:      $Id$
// Copyright:   (c) Aleksandras Gluchovas
// Licence:   	wxWindows license
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "bardragpl.h"
// #pragma interface
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#include "hintanimpl.h"

#define POS_UNDEFINED -32768

/***** Implementation for class cbHintAnimationPlugin *****/

// FIXME:: some of the below code should be eliminated by 
//         reusing parts of cbBarDragPlugin's implementation

IMPLEMENT_DYNAMIC_CLASS( cbHintAnimationPlugin, cbPluginBase )

BEGIN_EVENT_TABLE( cbHintAnimationPlugin, cbPluginBase )

	EVT_PL_DRAW_HINT_RECT( cbHintAnimationPlugin::OnDrawHintRect )

END_EVENT_TABLE()

cbHintAnimationPlugin::cbHintAnimationPlugin(void)

	: mpScrDc( NULL ),
	  mInClientHintBorder( 4 ),
	  mAnimStarted( FALSE ),
	  mpAnimTimer( 0 ),

	  mMorphDelay    ( 5   ),
	  mMaxFrames     ( 20   ),
	  mAccelerationOn( TRUE )
{}

cbHintAnimationPlugin::cbHintAnimationPlugin( wxFrameLayout* pPanel, int paneMask )

	: cbPluginBase( pPanel, paneMask ),
	  mpScrDc( NULL ),
	  mInClientHintBorder( 4 ),
	  mAnimStarted( FALSE ),
	  mpAnimTimer( 0 ),

	  mMorphDelay    ( 5   ),
	  mMaxFrames     ( 20   ),
	  mAccelerationOn( TRUE )
{}

cbHintAnimationPlugin::~cbHintAnimationPlugin()
{
	if ( mpScrDc ) delete mpScrDc;
}

/*** rect-tracking related methods ***/

void cbHintAnimationPlugin::OnDrawHintRect( cbDrawHintRectEvent& event )
{
	if ( !mAnimStarted && !mpScrDc ) 
	{
		StartTracking();

		mPrevInClient = event.mIsInClient;

		mPrevRect = event.mRect;

		mStopPending = FALSE;
	}

	if ( !event.mEraseRect )
	{
		// pass on current hint-rect info to the animation "thread", in 
		// order to make adjustments to the morph-target on-the-fly

		mCurRect.x = event.mRect.x;
		mCurRect.y = event.mRect.y;
		mCurRect.width  = event.mRect.width;
		mCurRect.height = event.mRect.height;
	}

	// check the amount of change in the shape of hint,
	// and start morph-effect if change is "sufficient"

	int change = abs( mCurRect.width  - mPrevRect.width  ) +
			     abs( mCurRect.height - mPrevRect.height );

	if ( change > 10 && !event.mLastTime && !event.mEraseRect )
	{
		if ( !mpAnimTimer )

			mpAnimTimer  = new cbHintAnimTimer();

		// init the animation "thread", or reinit if already started

		if ( mAnimStarted )
		{
			int o;
			++o;
		}

		mpAnimTimer->Init( this, mAnimStarted );

		mAnimStarted = TRUE;
	}
	else
	if ( !mAnimStarted )
	{
		DoDrawHintRect( event.mRect, event.mIsInClient );

		if ( event.mLastTime )

			FinishTracking();

		mPrevInClient = event.mIsInClient;
	}
	else
	{
		mCurInClient = event.mIsInClient;

		if ( event.mLastTime && mpAnimTimer ) 
		{
			mStopPending = TRUE;

			if ( mpAnimTimer->mPrevMorphed.x != POS_UNDEFINED )

				// erase previouse rect
				DoDrawHintRect( mpAnimTimer->mPrevMorphed, mPrevInClient );
		}
	}

	mPrevRect = event.mRect;
}

#define _A  0xAA
#define _B  0x00
#define _C  0x55
#define _D  0x00

static const unsigned char _gCheckerImg[] = { _A,_B,_C,_D,
										      _A,_B,_C,_D,
											  _A,_B,_C,_D,
											  _A,_B,_C,_D
											};

void cbHintAnimationPlugin::StartTracking()
{
	mpScrDc = new wxScreenDC;

	wxScreenDC::StartDrawingOnTop(&mpLayout->GetParentFrame());
}

void cbHintAnimationPlugin::DoDrawHintRect( wxRect& rect, bool isInClientRect)
{
	wxRect scrRect;

	RectToScr( rect, scrRect );

	int prevLF = mpScrDc->GetLogicalFunction();

	mpScrDc->SetLogicalFunction( wxXOR );

	if ( isInClientRect )
	{
		// BUG BUG BUG (wx):: somehow stippled brush works only  
		//					  when the bitmap created on stack, not
		//					  as a member of the class

		wxBitmap checker( (const char*)_gCheckerImg, 8,8 );

		wxBrush checkerBrush( checker );

		mpScrDc->SetPen( mpLayout->mNullPen );
		mpScrDc->SetBrush( checkerBrush );

		int half = mInClientHintBorder / 2;

		mpScrDc->DrawRectangle( scrRect.x - half, scrRect.y - half,
			                    scrRect.width + 2*half, mInClientHintBorder );

		mpScrDc->DrawRectangle( scrRect.x - half, scrRect.y + scrRect.height - half,
			                    scrRect.width + 2*half, mInClientHintBorder );

		mpScrDc->DrawRectangle( scrRect.x - half, scrRect.y + half - 1,
			                    mInClientHintBorder, scrRect.height - 2*half + 2);

		mpScrDc->DrawRectangle( scrRect.x + scrRect.width - half,
								scrRect.y + half - 1,
			                    mInClientHintBorder, scrRect.height - 2*half + 2);

		mpScrDc->SetBrush( wxNullBrush );
	}
	else
	{
		// otherwise draw 1-pixel thin borders

		mpScrDc->SetPen( mpLayout->mBlackPen );

		mpScrDc->DrawLine( scrRect.x, scrRect.y, 
						   scrRect.x + scrRect.width, scrRect.y );

		mpScrDc->DrawLine( scrRect.x, scrRect.y + 1, 
						   scrRect.x, scrRect.y + scrRect.height );

		mpScrDc->DrawLine( scrRect.x+1, scrRect.y + scrRect.height, 
						   scrRect.x + scrRect.width, scrRect.y + scrRect.height );

		mpScrDc->DrawLine( scrRect.x + scrRect.width , scrRect.y, 
						   scrRect.x + scrRect.width, scrRect.y + scrRect.height + 1);
	}

	mpScrDc->SetLogicalFunction( prevLF );
}

void cbHintAnimationPlugin::DrawHintRect ( wxRect& rect, bool isInClientRect)
{
	DoDrawHintRect( rect, isInClientRect );	
}

void cbHintAnimationPlugin::EraseHintRect( wxRect& rect, bool isInClientRect)
{
	DoDrawHintRect( rect, isInClientRect );	
}

void cbHintAnimationPlugin::FinishTracking()
{
	wxScreenDC::EndDrawingOnTop();

	delete mpScrDc;

	mpScrDc = NULL;
}

void cbHintAnimationPlugin::RectToScr( wxRect& frameRect, wxRect& scrRect )
{
	scrRect = frameRect;

	int x = frameRect.x, y = frameRect.y;

	mpLayout->GetParentFrame().ClientToScreen( &x, &y );

	scrRect.x = x;
	scrRect.y = y;
}

/***** Implementation for class cbHintAnimTimer *****/

cbHintAnimTimer::cbHintAnimTimer(void)
{
#ifdef __WINDOWS__
	mLock = NULL;
#endif

	mPrevMorphed.x = POS_UNDEFINED;
}

void cbHintAnimTimer::MorphPoint( wxPoint& origin, MorphInfoT& info, wxPoint& point )
{
	// simulate lienar movement (FOR NOW:: without acceleration)

	double k;
	
	if ( mpPl->mAccelerationOn )
		
		k = double( mCurIter*mCurIter ) / 
		    double( (mpPl->mMaxFrames - 1)*(mpPl->mMaxFrames - 1) );
	else
		k = double( mCurIter ) / double( mpPl->mMaxFrames - 1 );

	point.x = int ( double ( info.mFrom.x + double (info.mTill.x - info.mFrom.x) * k ) );

	point.y = int ( double ( info.mFrom.y + double (info.mTill.y - info.mFrom.y) * k ) );

	point.x += origin.x;
	point.y += origin.y;
}

void cbHintAnimTimer::Notify(void)
{
	// FIXME:: "clean" implementation should use mutex to sync
	//         between GUI and animation threads

	if ( mpPl->mStopPending )
	{
		Stop(); // top timer

		mpPl->FinishTracking();

		mpPl->mStopPending = FALSE;
		mpPl->mpAnimTimer  = NULL;
		mpPl->mAnimStarted = FALSE;

		mPrevMorphed.x = POS_UNDEFINED;

		delete this;

		return;
	}

	wxPoint origin( mpPl->mCurRect.x, mpPl->mCurRect.y );

	wxPoint curUpper, curLower;

	MorphPoint( origin, mUpperLeft,  curUpper  );
	MorphPoint( origin, mLowerRight, curLower );

	if ( mPrevMorphed.x != POS_UNDEFINED )

		// erase previouse rect
		mpPl->DoDrawHintRect( mPrevMorphed, mpPl->mPrevInClient );

	wxRect morphed( curUpper.x,  curUpper.y,
			        curLower.x - curUpper.x,
					curLower.y - curUpper.y );

	// draw rect of current iteration
	mpPl->DoDrawHintRect( morphed, 
						  ( mCurIter != mpPl->mMaxFrames - 1 ) 
						  ? mpPl->mPrevInClient : mpPl->mCurInClient );

	mPrevMorphed = morphed;

	if ( mCurIter == mpPl->mMaxFrames - 1 ) 
	{
		Stop(); // top timer
		
		mpPl->FinishTracking();
		mpPl->mpAnimTimer  = NULL;
		mpPl->mAnimStarted = FALSE;

		mPrevMorphed.x = POS_UNDEFINED;

		delete this;
	}
	else
		++mCurIter;
}

bool cbHintAnimTimer::Init( cbHintAnimationPlugin* pAnimPl, bool reinit )
{

	mpPl = pAnimPl;
	int o;
	++o;
	++o;

	// morph-points are set up relatively to the upper-left corner
	// of the current hint-rectangle

	if ( !reinit )
	{
		mUpperLeft.mFrom.x = mpPl->mPrevRect.x - mpPl->mCurRect.x;
		mUpperLeft.mFrom.y = mpPl->mPrevRect.y - mpPl->mCurRect.y;

		mLowerRight.mFrom.x = ( mUpperLeft.mFrom.x + mpPl->mPrevRect.width  );
		mLowerRight.mFrom.y = ( mUpperLeft.mFrom.y + mpPl->mPrevRect.height );
	}
	else
	{
		wxPoint origin( mpPl->mPrevRect.x, mpPl->mPrevRect.y );

		wxPoint curUpper, curLower;

		MorphPoint( origin, mUpperLeft,  curUpper  );
		MorphPoint( origin, mLowerRight, curLower );

		mUpperLeft.mFrom.x = curUpper.x - mpPl->mCurRect.x;
		mUpperLeft.mFrom.y = curUpper.y - mpPl->mCurRect.y;

		mLowerRight.mFrom.x = ( mUpperLeft.mFrom.x + curLower.x - curUpper.x );
		mLowerRight.mFrom.y = ( mUpperLeft.mFrom.y + curLower.y - curUpper.y );
	}

	mUpperLeft.mTill.x = 0;
	mUpperLeft.mTill.y = 0;

	mLowerRight.mTill.x = mpPl->mCurRect.width;
	mLowerRight.mTill.y = mpPl->mCurRect.height;

	mCurIter = 1;
	
	if ( !reinit )

		Start( mpPl->mMorphDelay );

	return TRUE;
}