Adding Custom Buttons
A File Manager extension can add custom buttons to the File Manager toolbar by
returning button information in response to the FMEVENT_TOOLBARLOAD message.
File Manager sends this message to the
FMExtensionProc function of the extension only if the extension successfully installed a
custom menu during the processing of the FMEVENT_LOAD message. Use custom buttons
as accelerator keys for menu commands specified in the custom menu.
When
FMExtensionProc receives the FMEVENT_TOOLBARLOAD message, the
lParam parameter points to an
FMS_TOOLBARLOAD structure. The File Manager extension must copy information about the custom
buttons to the structure, including the number of buttons and a specifier for
the bitmap containing the button images (either the identifier for a bitmap
resource or a handle to a memory bitmap). The extension must also include the
address of an array of
EXT_BUTTON structures, each of which must contain a command identifier for the
corresponding button. If the button is an accelerator for a menu command, the button
identifier and corresponding menu-command identifier must be equal.
The bitmap containing the button images must be a bitmap resource or a memory
bitmap. The extension must copy either the resource identifier or the memory
bitmap's handle to the
FMS_TOOLBARLOAD structure; and, in the case of a bitmap resource, the resource must be in the
extension's executable file.
The bitmap must contain one image for each specified button. The bitmap height
is always 15 pixels; the width is always a multiple of 16 pixels because each
button image must be 16 pixels wide. Button images are concatenated from left
to right. For example, the image of the first button specified in the array of
EXT_BUTTON structures must be the leftmost image in the bitmap.
An extension can provide a line of Help text for a button by specifying the
identifier of a string resource in the
idsHelp member of the
EXT_BUTTON structure. When the user selects the button, File Manager retrieves the
string resource and displays it on the toolbar.
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