Implement kindle like change page in epub backend

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>

2 files changed, 35 insertions, 1 deletions

diff --git a/epubview/epubview.py b/epubview/epubview.py
index c7f7862..8b49881 100644
--- a/epubview/epubview.py
+++ b/epubview/epubview.py
@@ -91,6 +91,7 @@ class _View(Gtk.HBox):
                 self._view_selection_changed_cb)
         self._view.connect_after('populate-popup',
                 self._view_populate_popup_cb)
+        self._view.connect('touch-change-page', self.__touch_page_changed_cb)
 
         self._sw.add(self._view)
         self._v_vscrollbar = self._sw.get_vscrollbar()
@@ -116,6 +117,12 @@ class _View(Gtk.HBox):
         self._view.set_can_default(True)
         self._view.set_can_focus(True)
 
+        def map_cp(widget):
+            widget.setup_touch()
+            widget.disconnect(self._setup_handle)
+
+        self._setup_handle = self._view.connect('map', map_cp)
+
     def set_document(self, epubdocumentinstance):
         '''
         Sets document (should be a Epub instance)
@@ -205,7 +212,6 @@ class _View(Gtk.HBox):
         """
         self._v_vscrollbar.get_adjustment().set_value(position)
 
-
     def can_zoom_in(self):
         '''
         Returns True if it is possible to zoom in further
@@ -317,6 +323,12 @@ class _View(Gtk.HBox):
         else:
             print ('Got unsupported scrolltype %s' % str(scrolltype))
 
+    def __touch_page_changed_cb(self, widget, forward):
+        if forward:
+            self.scroll(Gtk.ScrollType.PAGE_FORWARD, False)
+        else:
+            self.scroll(Gtk.ScrollType.PAGE_BACKWARD, False)
+
     def copy(self):
         '''
         Copies the current selection to clipboard.
diff --git a/epubview/widgets.py b/epubview/widgets.py
index 4dc5846..54f7326 100644
--- a/epubview/widgets.py
+++ b/epubview/widgets.py
@@ -1,11 +1,33 @@
 from gi.repository import WebKit
+from gi.repository import Gdk
+from gi.repository import GObject
 
 
 class _WebView(WebKit.WebView):
+
+    __gsignals__ = {
+        'touch-change-page': (GObject.SignalFlags.RUN_FIRST, GObject.TYPE_NONE,
+                ([bool])),
+    }
+
     def __init__(self, only_to_measure=False):
         WebKit.WebView.__init__(self)
         self._only_to_measure = only_to_measure
 
+    def setup_touch(self):
+        self.get_window().set_events(self.get_window().get_events() |
+                Gdk.EventMask.TOUCH_MASK)
+        self.connect('event', self.__event_cb)
+
+    def __event_cb(self, widget, event):
+        if event.type == Gdk.EventType.TOUCH_BEGIN:
+            x = event.touch.x
+            view_width = widget.get_allocation().width
+            if x > view_width * 3 / 4:
+                self.emit('touch-change-page', True)
+            elif x < view_width * 1 / 4:
+                self.emit('touch-change-page', False)
+
     def get_page_height(self):
         '''
         Gets height (in pixels) of loaded (X)HTML page.