Use signals to update statusbar in caret mode

This means we don't use objreg anymore to get the status bar, and also makes the
bar more accurately reflect reality.

See #3583

qutebrowser/browser/browsertab.py

@@ -333,7 +333,14 @@ class AbstractZoom(QObject):
 
 class AbstractCaret(QObject):
 
-    """Attribute of AbstractTab for caret browsing."""
+    """Attribute of AbstractTab for caret browsing.
+
+    Signals:
+        selection_toggled: Emitted when the selection was toggled.
+                           arg: Whether the selection is now active.
+    """
+
+    selection_toggled = pyqtSignal(bool)
 
     def __init__(self, tab, mode_manager, parent=None):
         super().__init__(parent)

qutebrowser/browser/webengine/webenginetab.py

@@ -230,7 +230,7 @@ class WebEngineCaret(browsertab.AbstractCaret):
 
         self._tab.run_js_async(
             javascript.assemble('caret', 'setPlatform', sys.platform))
-        self._js_call('setInitialCursor')
+        self._js_call('setInitialCursor', self.selection_toggled.emit)
 
     @pyqtSlot(usertypes.KeyMode)
     def _on_mode_left(self, mode):
@@ -297,7 +297,7 @@ class WebEngineCaret(browsertab.AbstractCaret):
         self._js_call('moveToEndOfDocument')
 
     def toggle_selection(self):
-        self._js_call('toggleSelection')
+        self._js_call('toggleSelection', self.selection_toggled.emit)
 
     def drop_selection(self):
         self._js_call('dropSelection')
@@ -352,9 +352,8 @@ class WebEngineCaret(browsertab.AbstractCaret):
             self._tab.run_js_async(js_code, lambda jsret:
                                    self._follow_selected_cb(jsret, tab))
 
-    def _js_call(self, command):
-        self._tab.run_js_async(
-            javascript.assemble('caret', command))
+    def _js_call(self, command, callback=None):
+        self._tab.run_js_async(javascript.assemble('caret', command), callback)
 
 
 class WebEngineScroller(browsertab.AbstractScroller):

qutebrowser/browser/webkit/webkittab.py

@@ -196,9 +196,10 @@ class WebKitCaret(browsertab.AbstractCaret):
         if mode != usertypes.KeyMode.caret:
             return
 
+        self.selection_enabled = self._widget.hasSelection()
+        self.selection_toggled.emit(self.selection_enabled)
         settings = self._widget.settings()
         settings.setAttribute(QWebSettings.CaretBrowsingEnabled, True)
-        self.selection_enabled = self._widget.hasSelection()
 
         if self._widget.isVisible():
             # Sometimes the caret isn't immediately visible, but unfocusing
@@ -363,9 +364,7 @@ class WebKitCaret(browsertab.AbstractCaret):
 
     def toggle_selection(self):
         self.selection_enabled = not self.selection_enabled
-        mainwindow = objreg.get('main-window', scope='window',
-                                window=self._tab.win_id)
-        mainwindow.status.set_mode_active(usertypes.KeyMode.caret, True)
+        self.selection_toggled.emit(self.selection_enabled)
 
     def drop_selection(self):
         self._widget.triggerPageAction(QWebPage.MoveToNextChar)

qutebrowser/javascript/caret.js

@@ -1269,13 +1269,14 @@ window._qutebrowser.caret = (function() {
     funcs.setInitialCursor = () => {
         if (!CaretBrowsing.initiated) {
             CaretBrowsing.setInitialCursor();
-            return;
+            return CaretBrowsing.selectionEnabled;
         }
 
         if (window.getSelection().toString().length === 0) {
             positionCaret();
         }
         CaretBrowsing.toggle();
+        return CaretBrowsing.selectionEnabled;
     };
 
     funcs.setPlatform = (platform) => {
@@ -1361,6 +1362,7 @@ window._qutebrowser.caret = (function() {
 
     funcs.toggleSelection = () => {
         CaretBrowsing.selectionEnabled = !CaretBrowsing.selectionEnabled;
+        return CaretBrowsing.selectionEnabled;
     };
 
     return funcs;

qutebrowser/mainwindow/mainwindow.py

@@ -479,6 +479,10 @@ class MainWindow(QWidget):
         self.tabbed_browser.cur_link_hovered.connect(status.url.set_hover_url)
         self.tabbed_browser.cur_load_status_changed.connect(
             status.url.on_load_status_changed)
+
+        self.tabbed_browser.cur_caret_selection_toggled.connect(
+            status.on_caret_selection_toggled)
+
         self.tabbed_browser.cur_fullscreen_requested.connect(
             self._on_fullscreen_requested)
         self.tabbed_browser.cur_fullscreen_requested.connect(status.maybe_hide)

qutebrowser/mainwindow/statusbar/bar.py

@@ -289,17 +289,9 @@ class StatusBar(QWidget):
             log.statusbar.debug("Setting prompt flag to {}".format(val))
             self._color_flags.prompt = val
         elif mode == usertypes.KeyMode.caret:
-            tab = self._current_tab()
-            log.statusbar.debug("Setting caret flag - val {}, selection "
-                                "{}".format(val, tab.caret.selection_enabled))
-            if val:
-                if tab.caret.selection_enabled:
-                    self._set_mode_text("{} selection".format(mode.name))
-                    self._color_flags.caret = ColorFlags.CaretMode.selection
-                else:
-                    self._set_mode_text(mode.name)
-                    self._color_flags.caret = ColorFlags.CaretMode.on
-            else:
+            if not val:
+                # Turning on is handled in on_current_caret_selection_toggled
+                log.statusbar.debug("Setting caret mode off")
                 self._color_flags.caret = ColorFlags.CaretMode.off
         config.set_register_stylesheet(self, update=False)
 
@@ -377,6 +369,18 @@ class StatusBar(QWidget):
         self.maybe_hide()
         assert tab.private == self._color_flags.private
 
+    @pyqtSlot(bool)
+    def on_caret_selection_toggled(self, selection):
+        """Update the statusbar when entering/leaving caret selection mode."""
+        log.statusbar.debug("Setting caret selection {}".format(selection))
+        if selection:
+            self._set_mode_text("caret selection")
+            self._color_flags.caret = ColorFlags.CaretMode.selection
+        else:
+            self._set_mode_text("caret")
+            self._color_flags.caret = ColorFlags.CaretMode.on
+        config.set_register_stylesheet(self, update=False)
+
     def resizeEvent(self, e):
         """Extend resizeEvent of QWidget to emit a resized signal afterwards.
 

qutebrowser/mainwindow/tabbedbrowser.py

@@ -104,6 +104,7 @@ class TabbedBrowser(QWidget):
     cur_scroll_perc_changed = pyqtSignal(int, int)
     cur_load_status_changed = pyqtSignal(str)
     cur_fullscreen_requested = pyqtSignal(bool)
+    cur_caret_selection_toggled = pyqtSignal(bool)
     close_window = pyqtSignal()
     resized = pyqtSignal('QRect')
     current_tab_changed = pyqtSignal(browsertab.AbstractTab)
@@ -217,6 +218,8 @@ class TabbedBrowser(QWidget):
             self._filter.create(self.cur_load_status_changed, tab))
         tab.fullscreen_requested.connect(
             self._filter.create(self.cur_fullscreen_requested, tab))
+        tab.caret.selection_toggled.connect(
+            self._filter.create(self.cur_caret_selection_toggled, tab))
         # misc
         tab.scroller.perc_changed.connect(self.on_scroll_pos_changed)
         tab.url_changed.connect(