133 lines
4.4 KiB
C++
133 lines
4.4 KiB
C++
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/**********************************************************************/
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/** Microsoft Windows NT **/
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/** Copyright(c) Microsoft Corp., 1991 **/
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/**********************************************************************/
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/*
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bltdlgxp.hxx
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Expandable dialog class declaration.
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This class represents a standard BLT DIALOG_WINDOW which can
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be expanded once to reveal new controls. All other operations
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are common between EXPANDABLE_DIALOG and DIALOG_WINDOW.
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To construct, provide the control ID of two controls: a "boundary"
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static text control (SLT) and an "expand" button.
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The "boundary" control is declared in the resource file as 2x2
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units in size, containing no text, and has only the WS_CHILD style.
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Its location marks the lower right corner of the reduced (initial)
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size of the dialog. Controls lower and/or to the right of this
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boundary "point" are disabled until the dialog is expanded.
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The "expand" button is a normal two-state button which usually has
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a title like "Options >>" to indicate that it changes the dialog.
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EXPANDABLE_DIALOG handles the state transition entirely, and the
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"expand" button is permanently disabled after the transition. In
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other words, it's a one way street.
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The virtual method OnExpand() is called when expansion takes place;
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this can be overridden to initialize controls which have been
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heretofor invisible. It's usually necessary to override the default
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version of OnExpand() to set focus on whichever control you want,
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since the control which had focus (the expand button) is now disabled.
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There is one optional parameter to the constructor. It specifies a
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distance, in dialog units. If the ShowArea() member finds that the
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"boundary" control is within this distance of the real (.RC file)
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border of the dialog, it will use the original border. This prevents
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small (3-10 unit) errors caused by the inability to place a control
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immediately against the dialog border.
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FILE HISTORY:
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DavidHov 11/1/91 Created
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*/
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#ifndef _BLTDLGXP_HXX_
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#define _BLTDLGXP_HXX_
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/*************************************************************************
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NAME: EXPANDABLE_DIALOG
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SYNOPSIS: A dialog whose initial state is small, and then expands
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to reveal more controls. Two controls are special:
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a "boundary" control which demarcates the
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limits of the smaller initial state, and
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an "expand" button which causes the dialog
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to grow to its full size; the button is then
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permanently disabled.
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About the "cPxBoundary" parameter: if the distance from
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the end of the boundary control to the edge of the dialog
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is LESS than this value, the size of the original dialog
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will be used for that dimension.
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INTERFACE:
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EXPANDABLE_DIALOG() -- constructor
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~EXPANDABLE_DIALOG() -- destructor
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Process() -- run the dialog
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OnExpand() -- optional virtual routine
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called when the dialog is
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expanded. Default routine
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just sets focus on OK button.
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PARENT: DIALOG_WINDOW
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USES: PUSH_BUTTON, SLT
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CAVEATS: The expansion process is one-way; that is, the dialog
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cannot be shrunk. The controlling button is permanently
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disabled after the expansion.
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NOTES:
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HISTORY:
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DavidHov 10/30/91 Created
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**************************************************************************/
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DLL_CLASS EXPANDABLE_DIALOG ;
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#define EXP_MIN_USE_BOUNDARY 20
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DLL_CLASS EXPANDABLE_DIALOG : public DIALOG_WINDOW
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{
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public:
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EXPANDABLE_DIALOG
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( const TCHAR * pszResourceName,
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HWND hwndOwner,
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CID cidBoundary,
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CID cidExpandButn,
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INT cPxBoundary = EXP_MIN_USE_BOUNDARY ) ;
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~ EXPANDABLE_DIALOG () ;
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// Overloaded 'Process' members for reducing initial dialog extent
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APIERR Process ( UINT * pnRetVal = NULL ) ;
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APIERR Process ( BOOL * pfRetVal ) ;
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protected:
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PUSH_BUTTON _butnExpand ; // The button which bloats
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SLT _sltBoundary ; // The "point" marker
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BOOL OnCommand ( const CONTROL_EVENT & event ) ;
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// Virtual called when dialog is to be expanded.
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virtual VOID OnExpand () ;
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VOID ShowArea ( BOOL fFull ) ; // Change dialog size
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private:
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XYDIMENSION _xyOriginal ; // Original dlg box dimensions
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INT _cPxBoundary ; // Limit to force original boundary
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BOOL _fExpanded ; // Dialog is expanded
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};
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#endif // _BLTDLGXP_HXX_
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