Irregular Shaped Bitmap Dialog

The CBitmapDialog class allows you to create a dialog that has a bitmap background, and to have a specified color in the background be transparent. This allows the dialog to be in other shapes than a box, like the one shown above.

Usage

Use this class like CDialog, but there are several extra functions that you can use:

// ** Constructors **

// Use the normal CDialog constructors plus the following 
// as the last four parameters:
// 
// LPCTSTR	lpszResourceName
// UINT		nIDResource
// LPCTSTR	lpszFilename
// CBitmap	*pBitmap
// 
// Example:
// CDialog(int,CWnd*)):CBitmapDialog(IDD_MAINDIALOG, 
                                     this, 
                                     NULL, 
                                     IDB_BITMAP, 
                                     NULL, 
                                     NULL);
//
// Use at most one of these parameters and leave the rest 
// NULL or 0. If you do not want to set a bitmap in the 
// constructor, look below.

// ** Bitmap Setting **

// Loads a bitmap from a resource string or filename.
//  Leave either lpszResourceName or lpszFilename NULL.
BOOL LoadBitmap (LPCTSTR lpszResourceName, 
                 LPCTSTR lpszFilename);

// Loads a bitmap from a resource ID
BOOL LoadBitmap (int nIDResource);

// Makes a copy of a given bitmap and uses the copy.  
// This is like SetBitmap but you are not responsible 
// for handling the bitmap.
BOOL CopyBitmapFrom (CBitmap *pBitmap);

// Uses the bitmap you specify.  NOTE: You are responsible 
// for handling the bitmap.
void SetBitmap (CBitmap *pBitmap);

// ** Transparency **

// Specifies whether the window should use transparency.
//  TRUE for transparent, FALSE for opaque. (default is 
//  FALSE)
void SetTransparent (BOOL bTransparent);
BOOL GetTransparent ();

// Specifies the color that you want to be transparent.
void SetTransColor (COLORREF col);
COLORREF GetTransColor ();

// Specifies whether static (text) controls have a 
// transparent background.
//  TRUE for transparent, FALSE for opaque. (default 
//  is TRUE)
void SetStaticTransparent (BOOL bTransparent);
BOOL GetStaticTransparent ();

// ** Dragging **

// With a transparent dialog, you usually won't have a 
// caption (like my example). 
//  These functions make it so that you can drag anywhere 
//  on the dialog to move it.  TRUE is on and FALSE is off. 
//  (default is FALSE)
void SetClickAnywhereMove (BOOL bMove);
BOOL GetClickAnywhereMove ();

Tips

* Dialogs that use transparency usually look best without a caption or a border. In the resource editor for your dialog, uncheck "title bar" and set "border" to "none."

How it works

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