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Microsoft OS/2 SDK 2.0 05-30-1990

/*==============================================================*\
 *  img_view.c - routines for handling the View menu functions
 *      Created 1989, 1990 IBM, Microsoft Corp.
 *--------------------------------------------------------------*
 *
 *  This module contains the code for handling the functions
 *  offered on the View submenu. These functions are called
 *  from the MainCommand() routine.
 *
 *--------------------------------------------------------------*
 *
 *  This source file contains the following functions:
 *
 *      ViewSwitchMode()
 *      ViewChangeColor()
 *      ViewSavePosition()
 *      ViewRestorePosition()
 *
\*==============================================================*/
/*--------------------------------------------------------------*\
 *  Include files, macros, defined constants, and externs       *
\*--------------------------------------------------------------*/
#define INCL_WINSCROLLBARS
#define INCL_WINFRAMEMGR
#define INCL_GPIPRIMITIVES

/*--------------------------------------------------------------*\
 *  Include files, macros, defined constants, and externs       *
\*--------------------------------------------------------------*/
#include <os2.h>
#include <stdlib.h>
#include "img_main.h"
#include "img_xtrn.h"
#include "img_dlg.h"

/*--------------------------------------------------------------*\
 *  Static variables                                            *
\*--------------------------------------------------------------*/
/* foreground/background color choices */
LONG  lColorArray[COLOR_COUNT] = {CLR_BLACK,
                                  CLR_WHITE,
                                  CLR_BLUE,
                                  CLR_GREEN,
                                  CLR_YELLOW,
                                  CLR_RED};

/****************************************************************\
 *  Switch Modes (Non-Detail <-> Detail) procedure
 *--------------------------------------------------------------
 *
 *  Name:   ViewSwitchMode()
 *
 *  Purpose: Toggles the mode of the application from Non-Detail
 *           to Detail mode and visa versa
 *
 *  Usage:  Routine is called whenever a WM_COMMAND message
 *          is posted to the main window in response to
 *          the user (de)selecting the Detail item
 *          from the View submenu
 *
 *  Method: Since Non-Detail mode is the opposite to Detail mode
 *          toggle the menu settings, and ownership of the
 *          scrollbars, and redraw. If entering Detail mode
 *          it is necessary to size the main window aswell.
 *
 *  Returns:
 *
\****************************************************************/
VOID ViewSwitchMode()
{

    vfDetail = !vfDetail;

   /*
    * detach/attach scrollbars to main window accordingly
    */
    WinSetParent(vhwndVScroll,
                 vfDetail ? vhwndFrame : HWND_OBJECT,
                 FALSE);
    WinSetParent(vhwndHScroll,
                 vfDetail ? vhwndFrame : HWND_OBJECT,
                 FALSE);

    WinSendMsg(vhwndFrame,
               WM_UPDATEFRAME,
               MPFROMLONG(FCF_VERTSCROLL | FCF_HORZSCROLL),
               0L);

    /* resize main window if in 'Detail' mode */
    if (vfDetail)
        SizeMainWindow();

    WinInvalidateRect(vhwndClient, (PRECTL)NULL, FALSE);

}   /* ViewSwitchMode() */

/****************************************************************\
 *  Change Color Routine
 *--------------------------------------------------------------
 *
 *  Name:   ViewChangeColor()
 *
 *  Purpose: To change the foreground/background colors of the
 *           selected image
 *
 *  Usage:  Routine is called whenever a WM_COMMAND message
 *          is posted to the main window in response to
 *          the user selecting a Color item from either the
 *          'Foreground'/'Background' Color items on the View submenu
 *
 *  Method:
 *
 *  Returns:
 *
\****************************************************************/
VOID ViewChangeColor(idColor)
USHORT idColor;
{
    LONG lForeClr, lBackClr;
    BOOL fSameClr;
    USHORT idItem;

   /*
    * change either the foreground/background color and save
    * previous settings so that the appropriate menuitem can
    * be reset
    */
    if (idColor < IDM_VIEWBACKCOLORBLACK) {
        lForeClr = lColorArray[idColor - COLOR_BASE];
        fSameClr = (lForeClr == vlBackClr);
        idItem = MenuGetColorItemId(IDM_VIEWFORECOLORBLACK);
    } else {
        lBackClr = lColorArray[idColor - COLOR_BASE - COLOR_COUNT];
        fSameClr = (lBackClr == vlForeClr);
        idItem = MenuGetColorItemId(IDM_VIEWBACKCOLORBLACK);
    }
   /*
    * if background color is the same as the foreground color
    * - ensure this is correct and get out if not
    */
    if (fSameClr) {
        if (MessageBox(vhwndFrame,
                       IDMSG_BACKEQFORE, IDMSG_WARNING,
                       MB_APPLMODAL | MB_YESNO | MB_CUAWARNING,
                       TRUE) == MBID_NO)
            return;
    }

    /* cancel previously checked item  & save new values */
    if (idColor < IDM_VIEWBACKCOLORBLACK) {
        MenuCheckItem(vhwndViewForeClr, idItem, FALSE);
        vlForeClr = lForeClr;
    } else {
        MenuCheckItem(vhwndViewBackClr, idItem, FALSE);
        vlBackClr = lBackClr;
    }

   /*
    * set colors appropriately and force redraw
    */
    GpiSetBackColor(vhps, vlBackClr);
    GpiSetColor(vhps, vlForeClr);
    GpiSetBackMix(vhps, BM_OVERPAINT);
    WinInvalidateRect(vhwndClient, (PRECTL)NULL, FALSE);

}   /* ViewChangeColor() */

/****************************************************************\
 *  Restore Image Position Routine
 *--------------------------------------------------------------
 *
 *  Name:   ViewRestorePosition()
 *
 *  Purpose: To restore the saved position of the image
 *
 *  Usage:  Routine is called whenever a WM_COMMAND message
 *          is posted to the main window in response to
 *          the user selecting the Restore Position item or the
 *          from the View submenu
 *
 *  Method:
 *
 *  Returns:
 *
\****************************************************************/
VOID ViewRestorePosition()
{
    RECTL rcl;

    /* only valid if image is loaded & in Detail mode */
    if (vfImgLoaded && vfDetail) {
        WinQueryWindowRect(vhwndClient, &rcl);
        GpiSetCurrentPosition(vhps, &vptlSave);
        WinSendMsg(vhwndVScroll,
                   SBM_SETPOS,
                   MPFROMLONG(vptlSave.y - rcl.yTop),
                   0L);
        WinSendMsg(vhwndHScroll,
                   SBM_SETPOS,
                   MPFROMLONG(labs(vptlSave.x)),
                   0L);
        WinInvalidateRect(vhwndClient, (PRECTL)NULL, FALSE);
    }

}   /* ViewRestorePosition() */

/****************************************************************\
 *  Save Image Position Routine
 *--------------------------------------------------------------
 *
 *  Name:   ViewSavePosition()
 *
 *  Purpose: To save the current position of the image
 *
 *  Usage:  Routine is called whenever a WM_COMMAND message
 *          is posted to the main window in response to
 *          the user selecting the Save Position item or the
 *          from the View submenu
 *
 *  Method:
 *
 *  Returns:
 *
\****************************************************************/
VOID ViewSavePosition()
{
    if (vfImgLoaded && vfDetail)
        GpiQueryCurrentPosition(vhps, &vptlSave);

}   /* ViewSavePosition() */

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