The window procedure for a toolbar automatically sets the size and position of the toolbar window. The height is based on the height of the buttons in the toolbar. The width is the same as the width of the parent window client area. The CCS_TOP and CCS_BOTTOM common control styles determine whether the toolbar is positioned along the top or bottom of the client area. By default, a toolbar has the CCS_TOP style.
The toolbar window procedure automatically adjusts the size of the toolbar when it receives a WM_SIZE or TB_AUTOSIZE message. An application should send either of these messages when the size of the parent window changes or after sending a message that requires the size of the toolbar to be adjusted, for example, after sending the TB_SETBUTTONSIZE message.
Windows CE also supports messages that enable you to customize the look and behavior of toolbars and toolbar buttons.
Create transparent toolbars by specifying the TBSTYLE_FLAT or TBSTYLE_TRANSPARENT styles. If you give a toolbar the TBSTYLE_FLAT style, the toolbar displays its buttons but the toolbar itself is transparent. If you give a toolbar the TBSTYLE_TRANSPARENT style, the client area shows through the buttons as well as through the underlying toolbar.
You can use image lists to customize the way a toolbar displays buttons in various states. You can set and retrieve image lists for toolbar buttons by using the TB_GETIMAGELIST and TB_SETIMAGELIST messages for buttons in their default unpressed state, and the TB_GETDISABLEDIMAGELIST and TB_SETDISABLEDIMAGELIST messages for buttons in their disabled state. Use the TB_LOADIMAGES message to load images into a toolbar image list.
Windows CE supports a toolbar button style called a drop-down button. When a user taps a button that has the TBSTYLE_DROPDOWN style, the toolbar sends a TBN_DROPDOWN notification to its parent window. The parent window usually responds by displaying a pop-up menu or list box under the drop-down button.
Because toolbars in Windows CE support the custom draw service, you have can customize a toolbar's appearance. If a toolbar provides this service, it sends the new NM_CUSTOMDRAW notification at specific times during drawing operations. The lParam of the NM_CUSTOMDRAW notification is a pointer to an NMCUSTOMDRAW structure, which contains the data necessary to draw the customized toolbar.