/*

File: IconDBCallbacks.c

Abstract: Data browser control callback functions for a list of icons with text 

          labels.

Version: 5.0

Change History:

    <5.0>   changed this file's name from IconListDef.c to 

            IconDBCallbacks.c

            converted everything from a List Definition to a Data 

            Browser draw item callback

            added a Data Browser item notification callback to 

            handle item selection and deselection

    <4.0>   removed all Classic code

    <3.0>   no changes necessary

    <2.0>   Carbonized

            added accessor functions for the Classic version (see 

            the comment below)

    <1.0>   first release version

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*/

#include "IconDBCallbacks.h"

enum

{

    kIconWidth = 32,

    kIconHeight = 32,

    kTextBoxHeight = 14,

    kIconTextSpacingV = 2,

    kContentHeight = kIconHeight + kTextBoxHeight + kIconTextSpacingV

};

static void calculateDrawingBounds(const Rect *inCellRect, Rect *outIconRect, 

                                    Rect *outTextRect);

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

pascal void DrawIconDataBrowserItemCB(ControlRef browser, DataBrowserItemID item, 

                                        DataBrowserPropertyID property, 

                                        DataBrowserItemState itemState, const Rect *theRect, 

                                        SInt16 gdDepth, Boolean colorDevice)

{

#pragma unused (theRect)

    Rect enclosingRect, iconRect, textRect;

    Boolean active;

    IconDBItemDataRec *itemData;

        /* The data browser currently gives us the content part bounds in the theRect 

           parameter but we want the enclosing part bounds to draw in so that we can 

           draw a fill style highlight. */

    GetDataBrowserItemPartBounds(browser, item, property, kDataBrowserPropertyEnclosingPart, 

                                    &enclosingRect);

    active = IsControlActive(browser);

    if ((itemState & kDataBrowserItemIsSelected) != 0)

    {

        ThemeDrawingState savedState;

        GetThemeDrawingState(&savedState);

        SetThemePen(active ? kThemeBrushPrimaryHighlightColor : kThemeBrushSecondaryHighlightColor, 

                    gdDepth, colorDevice);

        PaintRect(&enclosingRect);

        SetThemeDrawingState(savedState, true);

    }

    calculateDrawingBounds(&enclosingRect, &iconRect, &textRect);   // get the drawing Rects

    itemData = (IconDBItemDataRec *)item;

    PlotIconRef(&iconRect, kAlignNone, active ? kTransformNone : kTransformDisabled, 

                kIconServicesNormalUsageFlag, itemData->icon);

    DrawThemeTextBox(itemData->name, kThemeViewsFont, 

                        active ? kThemeStateActive : kThemeStateInactive, true, &textRect, 

                        teCenter, NULL);

}

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

static void calculateDrawingBounds(const Rect *inItemRect, Rect *outIconRect, Rect *outTextRect)

{

    short iconTop, itemCenterH;

    iconTop = inItemRect->top + ((inItemRect->bottom - inItemRect->top - kContentHeight) / 2);

    itemCenterH = (inItemRect->left + inItemRect->right) / 2;

    SetRect(outIconRect, itemCenterH - (kIconWidth / 2), iconTop, 

            itemCenterH + (kIconWidth / 2), iconTop + kIconHeight);

    SetRect(outTextRect, inItemRect->left, iconTop + kIconHeight + kIconTextSpacingV, 

            inItemRect->right, iconTop + kIconHeight + kIconTextSpacingV + kTextBoxHeight);

}

#pragma mark -

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

pascal void IconDataBrowserItemSelectionCB(ControlRef browser, DataBrowserItemID item, 

                                            DataBrowserItemNotification message)

{

#pragma unused (browser)

    IconDBItemDataRec *itemData;

    itemData = (IconDBItemDataRec *)item;

    switch (message)

    {

        case kDataBrowserItemSelected:

            SetControlVisibility(itemData->userPane, true, true);   // this will draw over the 

            break;                                              // previously selected user pane

        case kDataBrowserItemDeselected:

            SetControlVisibility(itemData->userPane, false, false);     // we've already been 

            break;  // drawn over so there's no need to update the display (which would flicker)

    }

}