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#### 7.3.19 Group ecb-mode-line

This group contains settings for the modelines of the ECB-tree-buffers:

User Option: mode-line-data

  Data shown in the modelines of the special ECB-buffers. Everey element of this list is a cons-cell where the car is used to define a buffer-name and the cdr to define the modeline-data for that buffer. For details about how to defining a buffer-name see `ecb-mode-line-prefixes` - its completely the same.

  The cdr is the data for ths modeline and can either be the symbol `sel-dir` or `sel-source` whereas the former one displays the current selected directory as modeline-data and the latter one the current selected source-file (without path).

  In addition to these two predefined values for every special ECB-buffer a plain string (which is displayed) or a function can be specified which gets three args (name of the buffer, current selected directory and current selected source-file) and must return a string which will be displayed in the modeline (or nil if no data should be displayed). Such a function can add the text-property `help-echo` to the result-string. Then this help-string will be displayed when the user moves the mouse over this section of the modeline.

  If a special ECB-buffer should not display special data in its modeline then this buffer-name should either not being added to this option or added with “No data” (= nil as cdr).

  The whole modeline of the special ECB-buffer consists of the prefix of `ecb-mode-line-prefixes` and the data of `ecb-mode-line-data` - eventually prepended by the window-number, see `ecb-mode-line-display-window-number`.

User Option: mode-line-data-face

  Face used for the data in the mode-line. See `ecb-mode-line-data`. For XEmacs the face should inherit from the face `modeline` (see `set-face-parent`)!

User Option: mode-line-display-window-number

  Display in the modeline of every special ECB-window the window-number. The left-top-most window in a frame has the window-number 0 and all other windows are numbered with increasing numbers in the sequence, functions like `other-window` or `next-window` would walk through the frame.

  This can be used to jump to windows by number with commands like:

        (defun my-switch-to-window-number (number)
          ``Switch to the nth window''
          (interactive ``P'')
          (if (integerp number)
              (select-window (nth number (window-list)))))

  Currently this feature is only available for GNU Emacs 21.X, because neither GNU Emacs < 21 nor XEmacs can evaluate dynamically forms in the mode-line.

User Option: mode-line-prefixes

  Prefixes shown in the modelines of the special ECB-buffers. The displayed prefix then looks like: “[ <PREFIX>[: ]]”, means if a prefix is defined for an special ECB-buffer then a single space is prepended and if there is additional text to display (e.g. the current directory in the sources buffer, see `ecb-mode-line-data`) then also the string “: ” is appended.

  Everey element of this list is a cons-cell where the car is used to define a buffer-name and the cdr to define the modeline-prefix for that buffer.

  The buffer-name can either be defined as plain string or with a symbol which contains the buffer-name as value. The latter one is recommended to define a prefix for one of the builtin ECB-tree-buffers because then simply the related option-symbol can be used. To add a prefix for the builtin directories tree-buffer just set the symbol `ecb-directories-buffer-name` as car.

  The cdr is the prefix for a buffer and can either be a string which used as it is or a function-symbol which is called with three argument (the buffer-name, the current selected directory and the current selected source-file) and must return either nil (for no prefix) or a string which is then used a prefix. Such a function can add the text-property `help-echo` to the result-string. Then this help-string will be displayed when the user moves the mouse over this section of the modeline.

  If a special ECB-buffer should not have a prefix in its modeline then this buffer-name should either not being added to this option or added with “No prefix” (= nil as cdr).

User Option: mode-line-prefix-face

  Face used for the prefix in the mode-line. See `ecb-mode-line-prefixes`. For XEmacs the face should inherit from the face `modeline` (see `set-face-parent`)!

User Option: mode-line-win-nr-face

  Face used for the window-number in the mode-line. See `ecb-mode-line-display-window-number`. For XEmacs the face should inherit from the face `modeline` (see `set-face-parent`)!

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