/*

    File:       LiveFeedbackDialog.cp

    Contains:   Demonstration of live feedback.

    Version:    Mac OS X

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*/

//

//  This file implements a dialog demonstrating live feedback with sliders

//  and scroll bars. In this case, we have one of each control. They are

//  connected to a text field showing the current value as well as each

//  other, i.e. moving one automatically adjusts the other.

//

#include "AppearanceSamplePrefix.h"

#if !BUILDING_FOR_CARBON_8

    #include <Carbon/Carbon.h>

#else

    #include <Carbon.h>

#endif

#include "LiveFeedbackDialog.h"

#include "AppearanceHelpers.h"

const ControlID kScrollBar          = { 'LIVE', 1 };

const ControlID kSlider             = { 'LIVE', 2 };

const ControlID kLabel              = { 'LIVE', 3 };

const ControlID kStaticText         = { 'LIVE', 4 };

ControlActionUPP    LiveFeedbackDialog::fProc = NewControlActionUPP( LiveFeedbackDialog::LiveActionProc );

LiveFeedbackDialog::LiveFeedbackDialog()

    : TWindow( CFSTR( "AppearanceSample" ), CFSTR( "Live Feedback" ) )

{

    ControlFontStyleRec     font;

    ControlRef              control;

    font.flags = kControlUseFontMask;

    font.font = kControlFontSmallSystemFont;

    ::GetControlByID( GetWindowRef(), &kLabel, &control );

    ::SetControlFontStyle( control, &font );

        // These controls have been created with a live scrolling

        // variant. We'll set the action proc using SetControlAction.

    ::GetControlByID( GetWindowRef(), &kScrollBar, &fScrollBar );

    ::SetControlReference( fScrollBar, (long)this );

    ::GetControlByID( GetWindowRef(), &kSlider, &fSlider );

    ::SetControlReference( fSlider, (long)this );

    ::SetControlAction( fScrollBar, fProc );

    ::SetControlAction( fSlider, fProc );

    ::SetThemeWindowBackground( GetWindowRef(), kThemeBrushDialogBackgroundActive, false );

    Show();

}

LiveFeedbackDialog::~LiveFeedbackDialog()

{

}

//---------------------------------------------------------------------------------

//  ¥ LiveActionProc

//---------------------------------------------------------------------------------

//  Here's our ControlActionUPP that also handles the indicator. At last, we can

//  actually use the same function callback for both! There is a difference when

//  called with the indicator as the part, as opposed to the up/down arrows, etc.

//  If we are called because the indicator is being dragged, the value has already

//  been calculated for us. If we are being called because the scroll bar arrows

//  have been pressed, then we must determine how much to scroll by and set the

//  scroll bar value accordingly. This allows us to have control over the amount

//  that arrows scroll by. We can allow the indicator dragging to determine the

//  value because the indicator always shows a percentage.

//

pascal void

LiveFeedbackDialog::LiveActionProc( ControlHandle control, SInt16 part )

{

    ControlHandle       text;

    Str255              valueText;

    LiveFeedbackDialog* dialog;

    SInt16              startValue;

    SInt16              delta;

    startValue = ::GetControlValue( control );

    delta = 0;

    switch ( part )

    {

        case kControlUpButtonPart:

            if ( startValue > GetControlMinimum( control ) )

                delta = -1;

            break;

        case kControlDownButtonPart:

            if ( startValue < GetControlMaximum( control ) )

                delta = 1;

            break;

        case kControlPageUpPart:

            if ( startValue > GetControlMinimum( control ) )

                delta = -10;

            break;

        case kControlPageDownPart:

            if ( startValue < GetControlMaximum( control ) )

                delta = 10;

            break;

    }

    if ( delta )

        ::SetControlValue( control, startValue + delta );

    if ( part != kControlIndicatorPart && delta == 0 )

        return;

    dialog = (LiveFeedbackDialog*)::GetControlReference( control );

    ::GetControlByID( dialog->GetWindowRef(), &kStaticText, &text );

    ::NumToString( ::GetControlValue( control ), valueText );

    ::SetStaticTextText( text, valueText, true );

    if ( control == dialog->fScrollBar )

        ::SetControlValue( dialog->fSlider, GetControlValue( control ) );

    else

        ::SetControlValue( dialog->fScrollBar, GetControlValue( control ) );

}