More work on the completion popup

src/pyj/complete.pyj

@@ -0,0 +1,85 @@
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
+from __python__ import hash_literals, bound_methods
+
+from dom import ensure_id
+from elementmaker import E
+from keycodes import get_key
+from popups import CompletionPopup
+
+class EditWithComplete:
+
+    def __init__(self, name, placeholder=None, tooltip=None, parent=None, input_type='text', onenterkey=None):
+        inpt = E.input(type=input_type, name=name, title=tooltip or '', placeholder=placeholder or '')
+        self.input_id = ensure_id(inpt)
+        self.onenterkey = onenterkey
+        self.completion_popup = CompletionPopup(parent=parent)
+        self.ignore_next_input = False
+        inpt.addEventListener('keydown', self.onkeydown)
+        inpt.addEventListener('input', self.oninput)
+        self.completion_popup.add_associated_widget(inpt)
+        if parent:
+            parent.appendChild(inpt)
+
+    @property
+    def text_input(self):
+        return document.getElementById(self.input_id)
+
+    def apply_completion(self):
+        self.ignore_next_input = True
+        text = self.completion_popup.current_text
+        self.text_input.value = text
+
+    def onkeydown(self, event):
+        k = get_key(event)
+        if self.completion_popup.is_visible and self.completion_popup.handle_keydown(k):
+            event.preventDefault(), event.stopPropagation()
+            return
+        if k is 'enter':
+            if self.onenterkey:
+                event.preventDefault(), event.stopPropagation()
+                self.enter_pressed()
+        elif k is 'tab':
+            if self.completion_popup.is_visible:
+                self.apply_completion()
+                event.preventDefault(), event.stopPropagation()
+
+    def oninput(self, event):
+        if self.ignore_next_input:
+            self.ignore_next_input = False
+        else:
+            ti = self.text_input
+            self.completion_popup.set_query(ti.value or '')
+            self.completion_popup.popup(ti)
+
+    def hide_completion_popup(self):
+        self.completion_popup.hide()
+
+    def add_associated_widget(self, widget_or_id):
+        self.completion_popup.add_associated_widget(widget_or_id)
+
+    def set_all_items(self, items):
+        self.completion_popup.set_all_items(items)
+
+
+def create_search_bar(action, name, tooltip=None, placeholder=None, button=None):
+
+    parent = E.div()
+    ewc = EditWithComplete(name, parent=parent, tooltip=tooltip, placeholder=placeholder)
+
+    def trigger():
+        ewc.hide_completion_popup()
+        action()
+    ewc.onenterkey = trigger
+
+    if button:
+        ewc.add_associated_widget(button)
+        button.addEventListener('click', trigger)
+    return parent
+
+# }}}
+
+def main(container):
+    ewc = EditWithComplete(parent=container, placeholder='Testing edit with complete')
+    ewc.set_all_items('a a1 a11 a12 a13 b b1 b2 b3'.split(' '))
+    ewc.text_input.focus()

src/pyj/popups.pyj

@@ -2,7 +2,8 @@
 # License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 from __python__ import hash_literals, bound_methods
 
-from dom import set_css, ensure_id
+from book_list.theme import get_color
+from dom import set_css, ensure_id, clear, build_rule, add_extra_css
 from elementmaker import E
 
 MODAL_Z_INDEX = 1000
@@ -16,26 +17,26 @@ def element_contains_click_event(element, event):
     r = element.getBoundingClientRect()
     return r.left <= event.clientX <= r.right and r.top <= event.clientY <= r.bottom
 
-def check_for_open_popups(event):
-    if not shown_popups.length:
-        return False
+def click_in_popup(event):
     for popup_id in shown_popups:
         popup = document.getElementById(popup_id)
-        if element_contains_click_event(popup, event):
-            return False
+        if popup and element_contains_click_event(popup, event):
+            return True
         w = associated_widgets[popup_id]
         if w and w.length:
             for wid in w:
                 widget = document.getElementById(wid)
-                if element_contains_click_event(widget, event):
-                    return False
-    return True
+                if widget and element_contains_click_event(widget, event):
+                    return True
+    return False
 
 def filter_clicks(event):
-    if check_for_open_popups(event):
+    if shown_popups.length:
         event.stopPropagation(), event.preventDefault()
-        for popup in list(shown_popups):
-            hide_popup(popup.getAttribute('id'))
+        if not click_in_popup(event):
+            for popup_id in shown_popups:
+                hide_popup(popup_id)
+            shown_popups.clear()
 
 def install_event_filters():
     window.addEventListener('click', filter_clicks, True)
@@ -49,30 +50,33 @@ def create_popup(parent, idprefix):
     parent.appendChild(div)
     return pid
 
-def show_popup(popup_id, *associated_widget_ids):
+def show_popup(popup_id, associated_widget_ids=None):
     elem = document.getElementById(popup_id)
     elem.style.display = 'block'
     shown_popups.add(popup_id)
-    associated_widgets[popup_id] = set()
-    for aid in associated_widget_ids:
-        associated_widgets[popup_id].add(aid)
+    associated_widgets[popup_id] = associated_widget_ids
 
 def hide_popup(popup_id):
     elem = document.getElementById(popup_id)
     elem.style.display = 'none'
-    shown_popups.discard(popup_id)
     v'delete associated_widgets[popup_id]'
 
 class CompletionPopup:
 
+    CLASS = 'popup-completion-items'
+    CURRENT_ITEM_CLASS = 'popup-completion-current-item'
+
     def __init__(self, parent=None, max_items=25):
         self.max_items = max_items
         self.container_id = create_popup(parent)
         self.items = []
+        self.matches = []
         c = self.container
         set_css(c, user_select='none')
+        c.appendChild(E.div(class_=self.CLASS, onclick=self._item_clicked))
         self.associated_widget_ids = set()
         self.current_query, self.is_upwards = '', False
+        self.applied_query = self.current_query
 
     @property
     def container(self):
@@ -84,21 +88,75 @@ class CompletionPopup:
 
     def set_all_items(self, items):
         self.items = items
+        self.matches = []
+        self.applied_query = ''
 
     def add_associated_widget(self, widget_or_id):
         if type(widget_or_id) is not 'string':
             widget_or_id = ensure_id(widget_or_id)
         self.associated_widget_ids.add(widget_or_id)
 
+    def popup(self, widget):
+        if not self.is_visible:
+            if self.applied_query is not self.current_query:
+                self._apply_query()
+            if self.matches.length:
+                self.show_at_widget(widget)
+
     def show_at_widget(self, w):
         br = w.getBoundingClientRect()
         if br.top > window.innerHeight - br.bottom:
             y, upwards = br.top, True
         else:
             y, upwards = br.bottom, False
-        self.show_at(br.left, y, br.width, upwards)
+        self._show_at(br.left, y, br.width, upwards)
 
-    def show_at(self, x, y, width, upwards):
+    def set_query(self, query):
+        self.current_query = query
+        if self.is_visible and self.applied_query is not self.current_query:
+            self._apply_query()
+            if not self.matches.length:
+                self.hide()
+
+    def hide(self):
+        self.container.style.display = 'none'
+
+    def highlight_up(self):
+        self.move_highlight(True)
+
+    def highlight_down(self):
+        self.move_highlight(False)
+
+    def handle_keydown(self, key):
+        if key is 'escape':
+            self.hide()
+            return True
+        if key is 'up':
+            self.highlight_up()
+            return True
+        if key is 'down':
+            self.highlight_down()
+            return True
+        return False
+
+    @property
+    def current_item(self):
+        c = self.container
+        return c.querySelector('{} > div.{}'.format(self.CLASS, self.CURRENT_ITEM_CLASS))
+
+    def move_highlight(self, up=True):
+        ans = None
+        div = self.current_item
+        if div:
+            div.classList.remove(self.CURRENT_ITEM_CLASS)
+            ans = div.previousSibling if up else div.nextSibling
+        if not ans:
+            c = self.container
+            ans = c.lastChild if up else c.firstChild
+        if ans:
+            ans.classList.add(self.CURRENT_ITEM_CLASS)
+
+    def _show_at(self, x, y, width, upwards):
         self.is_upwards = upwards
         c = self.container
         cs = c.style
@@ -107,4 +165,41 @@ class CompletionPopup:
         cs.bottom = y + 'px' if upwards else 'auto'
         cs.width = width + 'px'
         cs.maxHeight = ((y if upwards else window.innerHeight - y) - 10) + 'px'
-        show_popup(self.container_id, *self.associated_widget_ids)
+        show_popup(self.container_id, self.associated_widget_ids)
+
+    def _apply_query(self):
+        q = self.current_query.toLowerCase()
+        self.matches.clear()
+        self.applied_query = self.current_query
+        if not q:
+            self.matches = list(self.items[:self.max_items + 1])
+        else:
+            i = 0
+            while self.matches.length < self.max_items and i < self.items.length:
+                if self.items[i].toLowerCase().startswith(q):
+                    self.matches.push(self.items[i])
+                i += 1
+        self._render_matches()
+
+    def _render_matches(self):
+        c = self.container
+        clear(c.firstChild)
+        items = self.matches
+        if self.is_upwards:
+            items = reversed(items)
+        for m in items:
+            c.firstChild.appendChild(E.div(m))
+
+    def _item_clicked(self, ev):
+        self.hide()
+
+add_extra_css(def():
+    sel = 'div.' + CompletionPopup.CLASS
+    style = build_rule(sel, background_color=get_color('window-background'),
+                       border='solid 1px ' + get_color('window-foreground'))
+    sel += ' > div'
+    style += build_rule(sel, cursor='pointer', margin='1ex 1rem')
+    sel += ' > div.' + CompletionPopup.CURRENT_ITEM_CLASS
+    style += build_rule(sel, color=get_color('list-hover-foreground'), background_color=get_color('list-hover-background'))
+    return style
+)