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760 lines
29 KiB
EmacsLisp
760 lines
29 KiB
EmacsLisp
;;; tree-widget.el --- Tree widget -*- lexical-binding:t -*-
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;; Copyright (C) 2004-2022 Free Software Foundation, Inc.
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;; Author: David Ponce <david@dponce.com>
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;; Created: 16 Feb 2001
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;; Keywords: extensions
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;; This file is part of GNU Emacs
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;; This library provide a tree widget useful to display data
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;; structures organized in a hierarchical order.
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;;
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;; The following properties are specific to the tree widget:
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;;
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;; :open
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;; Set to non-nil to expand the tree. By default the tree is
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;; collapsed.
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;;
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;; :node
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;; Specify the widget used to represent the value of a tree node.
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;; By default this is an `item' widget which displays the
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;; tree-widget :tag property value if defined, or a string
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;; representation of the tree-widget value.
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;;
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;; :keep
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;; Specify a list of properties to keep when the tree is collapsed
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;; so they can be recovered when the tree is expanded. This
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;; property can be used in child widgets too.
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;;
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;; :expander (obsoletes :dynargs)
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;; Specify a function to be called to dynamically provide the
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;; tree's children in response to an expand request. This function
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;; will be passed the tree widget and must return a list of child
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;; widgets. Child widgets returned by the :expander function are
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;; stored in the :args property of the tree widget.
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;;
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;; :expander-p
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;; Specify a predicate which must return non-nil to indicate that
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;; the :expander function above has to be called. By default, to
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;; speed up successive expand requests, the :expander-p predicate
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;; return non-nil when the :args value is nil. So, by default, to
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;; refresh child values, it is necessary to set the :args property
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;; to nil, then redraw the tree.
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;;
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;; :open-icon (default `tree-widget-open-icon')
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;; :close-icon (default `tree-widget-close-icon')
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;; :empty-icon (default `tree-widget-empty-icon')
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;; :leaf-icon (default `tree-widget-leaf-icon')
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;; Those properties define the icon widgets associated to tree
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;; nodes. Icon widgets must derive from the `tree-widget-icon'
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;; widget. The :tag and :glyph-name property values are
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;; respectively used when drawing the text and graphic
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;; representation of the tree. The :tag value must be a string
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;; that represent a node icon, like "[+]" for example. The
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;; :glyph-name value must the name of an image found in the current
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;; theme, like "close" for example (see also the variable
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;; `tree-widget-theme').
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;;
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;; :guide (default `tree-widget-guide')
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;; :end-guide (default `tree-widget-end-guide')
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;; :no-guide (default `tree-widget-no-guide')
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;; :handle (default `tree-widget-handle')
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;; :no-handle (default `tree-widget-no-handle')
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;; Those properties define `item'-like widgets used to draw the
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;; tree guide lines. The :tag property value is used when drawing
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;; the text representation of the tree. The graphic look and feel
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;; is given by the images named "guide", "no-guide", "end-guide",
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;; "handle", and "no-handle" found in the current theme (see also
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;; the variable `tree-widget-theme').
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;;
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;; These are the default :tag values for icons, and guide lines:
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;;
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;; open-icon "[-]"
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;; close-icon "[+]"
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;; empty-icon "[X]"
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;; leaf-icon ""
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;; guide " |"
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;; no-guide " "
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;; end-guide " `"
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;; handle "-"
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;; no-handle " "
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;;
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;; The text representation of a tree looks like this:
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;;
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;; [-] 1 (open-icon :node)
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;; |-[+] 1.0 (guide+handle+close-icon :node)
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;; |-[X] 1.1 (guide+handle+empty-icon :node)
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;; `-[-] 1.2 (end-guide+handle+open-icon :node)
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;; |- 1.2.1 (no-guide+no-handle+guide+handle+leaf-icon leaf)
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;; `- 1.2.2 (no-guide+no-handle+end-guide+handle+leaf-icon leaf)
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;;
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;; By default, images will be used instead of strings to draw a
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;; nice-looking tree. See the `tree-widget-image-enable',
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;; `tree-widget-themes-directory', and `tree-widget-theme' options for
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;; more details.
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;;; Code:
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(require 'wid-edit)
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;;; Customization
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;;
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(defgroup tree-widget nil
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"Customization support for the Tree Widget library."
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:version "22.1"
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:group 'widgets)
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(defcustom tree-widget-image-enable t
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"Non-nil means that tree-widget will try to use images."
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:type 'boolean
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:version "27.1")
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(defvar tree-widget-themes-load-path
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'(load-path
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(let ((dir data-directory))
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(and dir (list dir (expand-file-name "images" dir)))))
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"List of locations in which to search for the themes sub-directory.
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Each element is an expression that returns a single directory or a list
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of directories.
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The default is to search in the `load-path' first, then in the
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\"images\" sub directory in the data directory, then in the data
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directory.
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The data directory is the value of the variable `data-directory'.")
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(defcustom tree-widget-themes-directory "tree-widget"
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"Name of the directory in which to look for an image theme.
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When nil use the directory where the tree-widget library is located.
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When it is a relative name, search in all occurrences of that sub
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directory in the path specified by `tree-widget-themes-load-path'.
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The default is to use the \"tree-widget\" relative name."
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:type '(choice (const :tag "Default" "tree-widget")
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(const :tag "Where is this library" nil)
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(directory :format "%{%t%}:\n%v")))
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(defcustom tree-widget-theme nil
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"Name of the theme in which to look for images.
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This is a sub directory of the themes directory specified by the
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`tree-widget-themes-directory' option.
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The default theme is \"default\". When an image is not found in a
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theme, it is searched in its parent theme.
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A complete theme must at least contain images with these file names
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with a supported extension (see also `tree-widget-image-formats'):
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\"guide\"
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A vertical guide line.
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\"no-guide\"
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An invisible vertical guide line.
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\"end-guide\"
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End of a vertical guide line.
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\"handle\"
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Horizontal guide line that joins the vertical guide line to an icon.
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\"no-handle\"
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An invisible handle.
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Plus images whose name is given by the :glyph-name property of the
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icon widgets used to draw the tree. By default these images are used:
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\"open\"
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Icon associated to an expanded tree.
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\"close\"
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Icon associated to a collapsed tree.
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\"empty\"
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Icon associated to an expanded tree with no child.
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\"leaf\"
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Icon associated to a leaf node."
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:type '(choice (const :tag "Default" nil)
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(string :tag "Name")))
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(defcustom tree-widget-image-properties-emacs
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'(:ascent center :mask (heuristic t))
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"Default properties of Emacs images."
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:type 'plist)
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(defcustom tree-widget-space-width 0.5
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"Amount of space between an icon image and a node widget.
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Must be a valid space :width display property.
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See Info node `(elisp)Specified Space'."
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:type '(choice (number :tag "Multiple of normal character width")
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sexp))
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;;; Image support
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;;
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(defsubst tree-widget-use-image-p ()
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"Return non-nil if image support is currently enabled."
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(and tree-widget-image-enable
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widget-image-enable
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(display-images-p)))
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(defsubst tree-widget-create-image (type file &optional props)
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"Create an image of type TYPE from FILE, and return it.
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Give the image the specified properties PROPS."
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(declare (obsolete create-image "27.1"))
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(apply #'create-image `(,file ,type nil ,@props)))
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(defsubst tree-widget-image-formats ()
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"Return the alist of image formats/file name extensions.
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See also the option `widget-image-conversion'."
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(delq nil
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(mapcar
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(lambda (fmt)
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(and (image-type-available-p (car fmt)) fmt))
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widget-image-conversion)))
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;; Buffer local cache of theme data.
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(defvar tree-widget--theme nil)
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(defsubst tree-widget-theme-name ()
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"Return the current theme name, or nil if no theme is active."
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(and tree-widget--theme (car (aref tree-widget--theme 0))))
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(defsubst tree-widget-set-parent-theme (name)
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"Set to NAME the parent theme of the current theme.
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The default parent theme is the \"default\" theme."
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(unless (member name (aref tree-widget--theme 0))
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(aset tree-widget--theme 0
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(append (aref tree-widget--theme 0) (list name)))
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;; Load the theme setup from the first directory where the theme
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;; is found.
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(catch 'found
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(dolist (dir (tree-widget-themes-path))
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(setq dir (expand-file-name name dir))
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(when (file-accessible-directory-p dir)
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(throw 'found
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(load (expand-file-name
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"tree-widget-theme-setup" dir)
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t)))))))
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(defun tree-widget-set-theme (&optional name)
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"In the current buffer, set the theme to use for images.
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The current buffer must be where the tree widget is drawn.
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Optional argument NAME is the name of the theme to use. It defaults
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to the value of the variable `tree-widget-theme'.
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Does nothing if NAME is already the current theme.
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If there is a \"tree-widget-theme-setup\" library in the theme
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directory, load it to setup a parent theme or the images properties.
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Typically it should contain something like this:
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(tree-widget-set-parent-theme \"my-parent-theme\")
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(tree-widget-set-image-properties
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\\='(:ascent center :mask (heuristic t)))"
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(or name (setq name (or tree-widget-theme "default")))
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(unless (string-equal name (tree-widget-theme-name))
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(setq-local tree-widget--theme (make-vector 4 nil))
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(tree-widget-set-parent-theme name)
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(tree-widget-set-parent-theme "default")))
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(defun tree-widget--locate-sub-directory (name path)
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"Locate all occurrences of the sub-directory NAME in PATH.
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Return a list of absolute directory names in reverse order, or nil if
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not found."
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(let ((found '()))
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(dolist (elt path)
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(with-demoted-errors "In tree-widget--locate-sub-directory: %S"
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(let ((dirs (eval elt t)))
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(dolist (dir (if (listp dirs) dirs (list dirs)))
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(and (file-accessible-directory-p
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(setq dir (expand-file-name name dir)))
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(push dir found))))))
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found))
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(defun tree-widget-themes-path ()
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"Return the path where to search for a theme.
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It is specified in variable `tree-widget-themes-directory'.
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Return a list of absolute directory names, or nil when no directory
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has been found accessible."
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(let ((path (aref tree-widget--theme 1)))
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(cond
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;; No directory was found.
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((eq path 'void) nil)
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;; The list of directories is available in the cache.
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(path)
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;; Use the directory where this library is located.
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((null tree-widget-themes-directory)
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(when (setq path (locate-library "tree-widget"))
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(setq path (file-name-directory path))
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(setq path (and (file-accessible-directory-p path)
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(list path)))
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;; Store the result in the cache for later use.
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(aset tree-widget--theme 1 (or path 'void))
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path))
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;; Check accessibility of absolute directory name.
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((file-name-absolute-p tree-widget-themes-directory)
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(setq path (expand-file-name tree-widget-themes-directory))
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(setq path (and (file-accessible-directory-p path)
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(list path)))
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;; Store the result in the cache for later use.
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(aset tree-widget--theme 1 (or path 'void))
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path)
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;; Locate a sub-directory in `tree-widget-themes-load-path'.
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(t
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(setq path (nreverse (tree-widget--locate-sub-directory
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tree-widget-themes-directory
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tree-widget-themes-load-path)))
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;; Store the result in the cache for later use.
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(aset tree-widget--theme 1 (or path 'void))
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path))))
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(defconst tree-widget--cursors
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;; Pointer shapes when the mouse pointer is over inactive
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;; tree-widget images.
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'(
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("guide" . arrow)
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("no-guide" . arrow)
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("end-guide" . arrow)
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("handle" . arrow)
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("no-handle" . arrow)
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))
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(defsubst tree-widget-set-image-properties (props)
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"In current theme, set images properties to PROPS.
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Does nothing if images properties have already been set for that
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theme."
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(or (aref tree-widget--theme 2)
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(aset tree-widget--theme 2 props)))
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(defsubst tree-widget-image-properties (name)
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"Return the properties of image NAME in current theme.
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Default global properties are provided in the variable
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`tree-widget-image-properties-emacs'."
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;; Add the pointer shape
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(cons :pointer
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(cons (or (cdr (assoc name tree-widget--cursors)) 'hand)
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(tree-widget-set-image-properties
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tree-widget-image-properties-emacs))))
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(defun tree-widget-lookup-image (name)
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"Look up in current theme for an image with NAME.
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Search first in current theme, then in parent themes (see also the
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function `tree-widget-set-parent-theme').
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Return the first image found having a supported format, or nil if not
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found."
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(let (file)
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(catch 'found
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(dolist (default-directory (tree-widget-themes-path))
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(dolist (dir (aref tree-widget--theme 0))
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(dolist (fmt (tree-widget-image-formats))
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(dolist (ext (cdr fmt))
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(setq file (expand-file-name (concat name ext) dir))
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(and (file-readable-p file)
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(file-regular-p file)
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(throw 'found
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(apply #'create-image
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file (car fmt) nil
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(tree-widget-image-properties name))))))))
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nil)))
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(defun tree-widget-find-image (name)
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"Find the image with NAME in current theme.
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NAME is an image file name sans extension.
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Return the image found, or nil if not found."
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(when (tree-widget-use-image-p)
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;; Ensure there is an active theme.
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(tree-widget-set-theme (tree-widget-theme-name))
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(let ((image (assoc name (aref tree-widget--theme 3))))
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;; The image NAME is found in the cache.
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(if image
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(cdr image)
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;; Search the image in current, and default themes.
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(prog1
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(setq image (tree-widget-lookup-image name))
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;; Store image reference in the cache for later use.
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(push (cons name image) (aref tree-widget--theme 3))))
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)))
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;;; Widgets
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;;
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(defun tree-widget-button-click (event)
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"Move to the position clicked on, and if it is a button, invoke it.
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EVENT is the mouse event received."
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(interactive "e")
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(mouse-set-point event)
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(let ((pos (widget-event-point event)))
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(if (get-char-property pos 'button)
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(widget-button-click event))))
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(defvar tree-widget-button-keymap
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(let ((km (make-sparse-keymap)))
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(set-keymap-parent km widget-keymap)
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(define-key km [down-mouse-1] 'tree-widget-button-click)
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km)
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"Keymap used inside node buttons.
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Handle mouse button 1 click on buttons.")
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(define-widget 'tree-widget-icon 'push-button
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"Basic widget other tree-widget icons are derived from."
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:format "%[%t%]"
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:keymap tree-widget-button-keymap
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:create 'tree-widget-icon-create
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:action 'tree-widget-icon-action
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:help-echo 'tree-widget-icon-help-echo
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)
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(define-widget 'tree-widget-open-icon 'tree-widget-icon
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"Icon for an expanded tree-widget node."
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:tag "[-]"
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:glyph-name "open"
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)
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(define-widget 'tree-widget-empty-icon 'tree-widget-icon
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"Icon for an expanded tree-widget node with no child."
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:tag "[X]"
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:glyph-name "empty"
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)
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(define-widget 'tree-widget-close-icon 'tree-widget-icon
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"Icon for a collapsed tree-widget node."
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:tag "[+]"
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:glyph-name "close"
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)
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(define-widget 'tree-widget-leaf-icon 'tree-widget-icon
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"Icon for a tree-widget leaf node."
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:tag ""
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:glyph-name "leaf"
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:button-face 'default
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)
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(define-widget 'tree-widget-guide 'item
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"Vertical guide line."
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:tag " |"
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;;:tag-glyph (tree-widget-find-image "guide")
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:format "%t"
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)
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(define-widget 'tree-widget-end-guide 'item
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"End of a vertical guide line."
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:tag " \\=`"
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;;:tag-glyph (tree-widget-find-image "end-guide")
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:format "%t"
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)
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(define-widget 'tree-widget-no-guide 'item
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"Invisible vertical guide line."
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:tag " "
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;;:tag-glyph (tree-widget-find-image "no-guide")
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:format "%t"
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)
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(define-widget 'tree-widget-handle 'item
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"Horizontal guide line that joins a vertical guide line to a node."
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:tag "-"
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||
;;:tag-glyph (tree-widget-find-image "handle")
|
||
:format "%t"
|
||
)
|
||
|
||
(define-widget 'tree-widget-no-handle 'item
|
||
"Invisible handle."
|
||
:tag " "
|
||
;;:tag-glyph (tree-widget-find-image "no-handle")
|
||
:format "%t"
|
||
)
|
||
|
||
(define-widget 'tree-widget 'default
|
||
"Tree widget."
|
||
:format "%v"
|
||
:convert-widget 'tree-widget-convert-widget
|
||
:value-get 'widget-value-value-get
|
||
:value-delete 'widget-children-value-delete
|
||
:value-create 'tree-widget-value-create
|
||
:action 'tree-widget-action
|
||
:help-echo 'tree-widget-help-echo
|
||
:expander-p 'tree-widget-expander-p
|
||
:open-icon 'tree-widget-open-icon
|
||
:close-icon 'tree-widget-close-icon
|
||
:empty-icon 'tree-widget-empty-icon
|
||
:leaf-icon 'tree-widget-leaf-icon
|
||
:guide 'tree-widget-guide
|
||
:end-guide 'tree-widget-end-guide
|
||
:no-guide 'tree-widget-no-guide
|
||
:handle 'tree-widget-handle
|
||
:no-handle 'tree-widget-no-handle
|
||
)
|
||
|
||
;;; Widget support functions
|
||
;;
|
||
(defun tree-widget-p (widget)
|
||
"Return non-nil if WIDGET is a tree-widget."
|
||
(let ((type (widget-type widget)))
|
||
(while (and type (not (eq type 'tree-widget)))
|
||
(setq type (widget-type (get type 'widget-type))))
|
||
(eq type 'tree-widget)))
|
||
|
||
(defun tree-widget-node (widget)
|
||
"Return WIDGET's :node child widget.
|
||
If not found, setup an `item' widget as default.
|
||
Signal an error if the :node widget is a tree-widget.
|
||
WIDGET is, or derives from, a tree-widget."
|
||
(let ((node (widget-get widget :node)))
|
||
(if node
|
||
;; Check that the :node widget is not a tree-widget.
|
||
(and (tree-widget-p node)
|
||
(error "Invalid tree-widget :node %S" node))
|
||
;; Setup an item widget as default :node.
|
||
(setq node `(item :tag ,(or (widget-get widget :tag)
|
||
(widget-princ-to-string
|
||
(widget-value widget)))))
|
||
(widget-put widget :node node))
|
||
node))
|
||
|
||
(defun tree-widget-keep (arg widget)
|
||
"Save in ARG the WIDGET's properties specified by :keep."
|
||
(dolist (prop (widget-get widget :keep))
|
||
(widget-put arg prop (widget-get widget prop))))
|
||
|
||
(defun tree-widget-children-value-save (widget &optional args node)
|
||
"Save WIDGET children values.
|
||
WIDGET is, or derives from, a tree-widget.
|
||
Children properties and values are saved in ARGS if non-nil, else in
|
||
WIDGET's :args property value. Properties and values of the
|
||
WIDGET's :node sub-widget are saved in NODE if non-nil, else in
|
||
WIDGET's :node sub-widget."
|
||
(let ((args (cons (or node (widget-get widget :node))
|
||
(or args (widget-get widget :args))))
|
||
(children (widget-get widget :children))
|
||
arg child)
|
||
(while (and args children)
|
||
(setq arg (car args)
|
||
args (cdr args)
|
||
child (car children)
|
||
children (cdr children))
|
||
(if (tree-widget-p child)
|
||
;;;; The child is a tree node.
|
||
(progn
|
||
;; Backtrack :args and :node properties.
|
||
(widget-put arg :args (widget-get child :args))
|
||
(widget-put arg :node (widget-get child :node))
|
||
;; Save :open property.
|
||
(widget-put arg :open (widget-get child :open))
|
||
;; The node is open.
|
||
(when (widget-get child :open)
|
||
;; Save the widget value.
|
||
(widget-put arg :value (widget-value child))
|
||
;; Save properties specified in :keep.
|
||
(tree-widget-keep arg child)
|
||
;; Save children.
|
||
(tree-widget-children-value-save
|
||
child (widget-get arg :args) (widget-get arg :node))))
|
||
;;;; Another non tree node.
|
||
;; Save the widget value.
|
||
(widget-put arg :value (widget-value child))
|
||
;; Save properties specified in :keep.
|
||
(tree-widget-keep arg child)))))
|
||
|
||
;;; Widget creation
|
||
;;
|
||
(defvar tree-widget-before-create-icon-functions nil
|
||
"Hooks run before to create a tree-widget icon.
|
||
Each function is passed the icon widget not yet created.
|
||
The value of the icon widget :node property is a tree :node widget or
|
||
a leaf node widget, not yet created.
|
||
This hook can be used to dynamically change properties of the icon and
|
||
associated node widgets. For example, to dynamically change the look
|
||
and feel of the tree-widget by changing the values of the :tag
|
||
and :glyph-name properties of the icon widget.
|
||
This hook should be local in the buffer setup to display widgets.")
|
||
|
||
(defun tree-widget-icon-create (icon)
|
||
"Create the ICON widget."
|
||
(run-hook-with-args 'tree-widget-before-create-icon-functions icon)
|
||
(widget-put icon :tag-glyph
|
||
(tree-widget-find-image (widget-get icon :glyph-name)))
|
||
;; Ensure there is at least one char to display the image.
|
||
(and (widget-get icon :tag-glyph)
|
||
(equal "" (or (widget-get icon :tag) ""))
|
||
(widget-put icon :tag " "))
|
||
(widget-default-create icon)
|
||
;; Insert space between the icon and the node widget.
|
||
(insert-char ? 1)
|
||
(put-text-property
|
||
(1- (point)) (point)
|
||
'display (list 'space :width tree-widget-space-width)))
|
||
|
||
(defun tree-widget-convert-widget (widget)
|
||
"Convert :args as widget types in WIDGET."
|
||
(let ((tree (widget-types-convert-widget widget)))
|
||
;; Compatibility
|
||
(widget-put tree :expander (or (widget-get tree :expander)
|
||
(widget-get tree :dynargs)))
|
||
tree))
|
||
|
||
(defun tree-widget-value-create (tree)
|
||
"Create the TREE tree-widget."
|
||
(let* ((node (tree-widget-node tree))
|
||
(flags (widget-get tree :tree-widget--guide-flags))
|
||
(indent (widget-get tree :indent))
|
||
;; Setup widget's image support. Looking up for images, and
|
||
;; setting widgets' :tag-glyph is done here, to allow us to
|
||
;; dynamically change the image theme.
|
||
(widget-image-enable (tree-widget-use-image-p))
|
||
children buttons)
|
||
(and indent (not (widget-get tree :parent))
|
||
(insert-char ?\ indent))
|
||
(if (widget-get tree :open)
|
||
;;;; Expanded node.
|
||
(let ((args (widget-get tree :args))
|
||
(guide (widget-get tree :guide))
|
||
(noguide (widget-get tree :no-guide))
|
||
(endguide (widget-get tree :end-guide))
|
||
(handle (widget-get tree :handle))
|
||
(nohandle (widget-get tree :no-handle))
|
||
(guidi (tree-widget-find-image "guide"))
|
||
(noguidi (tree-widget-find-image "no-guide"))
|
||
(endguidi (tree-widget-find-image "end-guide"))
|
||
(handli (tree-widget-find-image "handle"))
|
||
(nohandli (tree-widget-find-image "no-handle")))
|
||
;; Request children at run time, when requested.
|
||
(when (and (widget-get tree :expander)
|
||
(widget-apply tree :expander-p))
|
||
(setq args (mapcar #'widget-convert
|
||
(widget-apply tree :expander)))
|
||
(widget-put tree :args args))
|
||
;; Defer the node widget creation after icon creation.
|
||
(widget-put tree :node (widget-convert node))
|
||
;; Create the icon widget for the expanded tree.
|
||
(push (widget-create-child-and-convert
|
||
tree (widget-get tree (if args :open-icon :empty-icon))
|
||
;; Pass the node widget to child.
|
||
:node (widget-get tree :node))
|
||
buttons)
|
||
;; Create the tree node widget.
|
||
(push (widget-create-child tree (widget-get tree :node))
|
||
children)
|
||
;; Update the icon :node with the created node widget.
|
||
(widget-put (car buttons) :node (car children))
|
||
;; Create the tree children.
|
||
(while args
|
||
(setq node (car args)
|
||
args (cdr args))
|
||
(and indent (insert-char ?\ indent))
|
||
;; Insert guide lines elements from previous levels.
|
||
(dolist (f (reverse flags))
|
||
(widget-create-child-and-convert
|
||
tree (if f guide noguide)
|
||
:tag-glyph (if f guidi noguidi))
|
||
(widget-create-child-and-convert
|
||
tree nohandle :tag-glyph nohandli))
|
||
;; Insert guide line element for this level.
|
||
(widget-create-child-and-convert
|
||
tree (if args guide endguide)
|
||
:tag-glyph (if args guidi endguidi))
|
||
;; Insert the node handle line
|
||
(widget-create-child-and-convert
|
||
tree handle :tag-glyph handli)
|
||
(if (tree-widget-p node)
|
||
;; Create a sub-tree node.
|
||
(push (widget-create-child-and-convert
|
||
tree node :tree-widget--guide-flags
|
||
(cons (if args t) flags))
|
||
children)
|
||
;; Create the icon widget for a leaf node.
|
||
(push (widget-create-child-and-convert
|
||
tree (widget-get tree :leaf-icon)
|
||
;; At this point the node widget isn't yet created.
|
||
:node (setq node (widget-convert
|
||
node :tree-widget--guide-flags
|
||
(cons (if args t) flags)))
|
||
:tree-widget--leaf-flag t)
|
||
buttons)
|
||
;; Create the leaf node widget.
|
||
(push (widget-create-child tree node) children)
|
||
;; Update the icon :node with the created node widget.
|
||
(widget-put (car buttons) :node (car children)))))
|
||
;;;; Collapsed node.
|
||
;; Defer the node widget creation after icon creation.
|
||
(widget-put tree :node (widget-convert node))
|
||
;; Create the icon widget for the collapsed tree.
|
||
(push (widget-create-child-and-convert
|
||
tree (widget-get tree :close-icon)
|
||
;; Pass the node widget to child.
|
||
:node (widget-get tree :node))
|
||
buttons)
|
||
;; Create the tree node widget.
|
||
(push (widget-create-child tree (widget-get tree :node))
|
||
children)
|
||
;; Update the icon :node with the created node widget.
|
||
(widget-put (car buttons) :node (car children)))
|
||
;; Save widget children and buttons. The tree-widget :node child
|
||
;; is the first element in :children.
|
||
(widget-put tree :children (nreverse children))
|
||
(widget-put tree :buttons buttons)))
|
||
|
||
;;; Widget callbacks
|
||
;;
|
||
(defsubst tree-widget-leaf-node-icon-p (icon)
|
||
"Return non-nil if ICON is a leaf node icon.
|
||
That is, if its :node property value is a leaf node widget."
|
||
(widget-get icon :tree-widget--leaf-flag))
|
||
|
||
(defun tree-widget-icon-action (icon &optional event)
|
||
"Handle the ICON widget :action.
|
||
If ICON :node is a leaf node it handles the :action. The tree-widget
|
||
parent of ICON handles the :action otherwise.
|
||
Pass the received EVENT to :action."
|
||
(let ((node (widget-get icon (if (tree-widget-leaf-node-icon-p icon)
|
||
:node :parent))))
|
||
(widget-apply node :action event)))
|
||
|
||
(defun tree-widget-icon-help-echo (icon)
|
||
"Return the help-echo string of ICON.
|
||
If ICON :node is a leaf node it handles the :help-echo. The tree-widget
|
||
parent of ICON handles the :help-echo otherwise."
|
||
(let* ((node (widget-get icon (if (tree-widget-leaf-node-icon-p icon)
|
||
:node :parent)))
|
||
(help-echo (widget-get node :help-echo)))
|
||
(if (functionp help-echo)
|
||
(funcall help-echo node)
|
||
help-echo)))
|
||
|
||
(defvar tree-widget-after-toggle-functions nil
|
||
"Hooks run after toggling a tree-widget expansion.
|
||
Each function is passed a tree-widget. If the value of the :open
|
||
property is non-nil the tree has been expanded, else collapsed.
|
||
This hook should be local in the buffer setup to display widgets.")
|
||
|
||
(defun tree-widget-action (tree &optional _event)
|
||
"Handle the :action of the TREE tree-widget.
|
||
That is, toggle expansion of the TREE tree-widget.
|
||
Ignore the EVENT argument."
|
||
(let ((open (not (widget-get tree :open))))
|
||
(or open
|
||
;; Before to collapse the node, save children values so next
|
||
;; open can recover them.
|
||
(tree-widget-children-value-save tree))
|
||
(widget-put tree :open open)
|
||
(widget-value-set tree open)
|
||
(run-hook-with-args 'tree-widget-after-toggle-functions tree)))
|
||
|
||
(defun tree-widget-help-echo (tree)
|
||
"Return the help-echo string of the TREE tree-widget."
|
||
(if (widget-get tree :open)
|
||
"Collapse node"
|
||
"Expand node"))
|
||
|
||
(defun tree-widget-expander-p (tree)
|
||
"Return non-nil if the TREE tree-widget :expander has to be called.
|
||
That is, if TREE :args is nil."
|
||
(null (widget-get tree :args)))
|
||
|
||
(provide 'tree-widget)
|
||
|
||
;;; tree-widget.el ends here
|