Submission view up and running.

rtv/viewer.py

@@ -12,11 +12,12 @@ class Navigator(object):
             cursor_index=0,
             inverted=False):
 
-        self._page_cb = valid_page_cb
-
         self.page_index = page_index
         self.cursor_index = cursor_index
         self.inverted = inverted
+        self._page_cb = valid_page_cb
+        self._header_window = None
+        self._content_window = None
 
     @property
     def step(self):
@@ -26,6 +27,10 @@ class Navigator(object):
     def position(self):
         return (self.page_index, self.cursor_index, self.inverted)
 
+    @property
+    def absolute_index(self):
+        return self.page_index + (self.step * self.cursor_index)
+
     def move(self, direction, n_windows):
         "Move the cursor down (positive direction) or up (negative direction)"
 
@@ -70,10 +75,12 @@ class BaseViewer(object):
     Base terminal viewer incorperates a cursor to navigate content
     """
 
-    def __init__(self, content):
+    def __init__(self, stdscr, content, **kwargs):
 
+        self.stdscr = stdscr
         self.content = content
-        self.nav = Navigator(self.content.get)
+
+        self.nav = Navigator(self.content.get, **kwargs)
 
         self._subwindows = None
 
@@ -87,13 +94,61 @@ class BaseViewer(object):
         self._move_cursor(1)
 
     def add_cursor(self):
-        curses.curs_set(2)
         self._edit_cursor(curses.A_REVERSE)
 
     def remove_cursor(self):
-        curses.curs_set(0)
         self._edit_cursor(curses.A_NORMAL)
 
+    def clear_input_queue(self):
+        "Clear excessive input caused by the scroll wheel or holding down a key"
+        self.stdscr.nodelay(1)
+        while self.stdscr.getch() != -1:
+            continue
+        self.stdscr.nodelay(0)
+
+    def draw_header(self):
+
+        n_rows, n_cols = self._header_window.getmaxyx()
+
+        self._header_window.erase()
+        self._header_window.addnstr(0, 0, self.content.display_name, n_cols-1)
+        self._header_window.refresh()
+
+    def draw_content(self):
+        """
+        Loop through submissions and fill up the content page.
+        """
+
+        n_rows, n_cols = self._content_window.getmaxyx()
+        self._content_window.erase()
+        self._subwindows = []
+
+        page_index, cursor_index, inverted = self.nav.position
+        step = self.nav.step
+
+        # If not inverted, align the first submission with the top and draw
+        # downwards. If inverted, align the first submission with the bottom
+        # and draw upwards.
+        current_row = n_rows if inverted else 0
+        available_rows = n_rows
+        for data in self.content.iterate(page_index, step, n_cols-2):
+            window_rows = min(available_rows, data['n_rows'])
+            window_cols = n_cols - data['offset']
+            start = current_row - window_rows if inverted else current_row
+            subwindow = self._content_window.derwin(
+                window_rows, window_cols, start, data['offset'])
+            self.draw_item(subwindow, data, inverted)
+            self._subwindows.append(subwindow)
+            available_rows -= (window_rows + 1)  # Add one for the blank line
+            current_row += step * (window_rows + 1)
+            if available_rows <= 0:
+                break
+
+        self._content_window.refresh()
+
+    def draw_item(self, window, data, inverted):
+        raise NotImplementedError
+
     def _move_cursor(self, direction):
 
         self.remove_cursor()
@@ -101,18 +156,24 @@ class BaseViewer(object):
         valid, redraw = self.nav.move(direction, len(self._subwindows))
         if not valid:
             curses.flash()
-        if redraw:
+
+        # If we don't redraw, ACS_VLINE gets screwed up when changing the
+        # attr back to normal. There may be a way around this.
+        if True: #if redraw
             self.draw_content()
 
         self.add_cursor()
 
     def _edit_cursor(self, attribute):
 
-        window = self._subwindows[self.nav.cursor_index]
+        # Don't alow the cursor to go below page index 0
+        if self.nav.absolute_index == -1:
+            window = self._subwindows[self.nav.cursor_index + 1]
+        else:
+            window = self._subwindows[self.nav.cursor_index]
 
         n_rows, _ = window.getmaxyx()
         for row in xrange(n_rows):
             window.chgat(row, 0, 1, attribute)
-        window.move(0, 0)
 
         window.refresh()