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cursor.py
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cursor.py
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'''
Copyright 2010, Andrew Thigpen
This file is part of PyTTY.
PyTTY is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PyTTY is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PyTTY. If not, see <http://www.gnu.org/licenses/>.
'''
import log
from PyQt4 import QtGui, QtCore
from sequencer import ScrollScreenException, ScrollDirection
class TerminalCursor:
CURSOR_COLOR = QtGui.QColor(0, 255, 0)
def __init__(self, parent, font_name='Consolas', font_size=11):
self.log = log.get_log(self)
self.row = 0
self.col = 0
self.parent = parent
self.set_font(font_name, font_size)
self.reset_attributes()
self._cursor_pos_stack = []
self.replace_mode = True
if self.parent is not None:
self.widget = self.parent.get_widget()
def set_font(self, name, size=10):
self.font = QtGui.QFont(name, size)
self._calculate_font_metrics()
def get_font(self):
return self.font
def _calculate_font_metrics(self):
metrics = QtGui.QFontMetrics(self.font)
self.col_size = metrics.width('a')
self.row_size = metrics.height()
self.log.debug("Font metrics: (%s, %s)" % \
(self.col_size, self.row_size))
def get_font_metrics(self):
return (self.col_size, self.row_size)
def set_cell_foreground(self, color):
self.fgcolor = color
def set_cell_background(self, color):
self.bgcolor = color
def set_bold(self, bold=True):
self.font.setBold(bold)
def set_underline(self, underline=True):
self.underline = underline
def set_inverse(self, inverse=True):
self.inverse = inverse
def set_wraparound(self, wrap=True):
self.wrap = wrap
def set_replace_mode(self, replace=True):
self.replace_mode = replace
def reset_attributes(self):
self.fgcolor = QtGui.QColor(255, 255, 255)
self.bgcolor = QtGui.QColor(0, 0, 0)
self.font.setBold(False)
self.underline = False
self.inverse = False
self.wrap = True
def reset_cell(self):
cell = self.get_cell()
cell.reset()
self.widget.update(self.position())
def previous_column(self, scroll=True):
#old_pos = self.position()
self.get_cell().dirty = True
self.col -= 1
(width, height) = self.parent.get_size()
if self.col < 0:
if self.wrap:
self.col = width - 1
self.previous_row(scroll=scroll)
else:
self.col = 0
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def previous_row(self, scroll=True, reset_col=False):
#old_pos = self.position()
self.get_cell().dirty = True
self.row -= 1
if reset_col:
self.col = 0
scroll_top = self.parent.get_scroll_top()
if scroll and self.row < scroll_top:
if self.row < 0:
self.row = 0
raise ScrollScreenException(direction=ScrollDirection.UP)
if self.row < 0:
self.row = 0
#new_pos = self.position()
self.get_cell().dirty = True
#self.parent.get_widget().update(old_pos)
#self.parent.get_widget().update(new_pos)
def advance_column(self, scroll=True):
#old_pos = self.position()
self.get_cell().dirty = True
self.col += 1
(width, height) = self.parent.get_size()
if self.col >= width:
if self.wrap:
self.col = 0
self.advance_row(scroll=scroll)
else:
self.col = width - 1
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def advance_row(self, scroll=True, reset_col=True):
#old_pos = self.position()
self.get_cell().dirty = True
self.row += 1
if reset_col:
self.col = 0
scroll_bottom = self.parent.get_scroll_bottom()
self.log.debug("Advance row: scroll_bottom=%s, row=%s, scroll=%s" % \
(scroll_bottom, self.row, scroll))
if scroll and self.row >= scroll_bottom: #(base + height):
buffer_size = self.parent.get_buffer_size()
if self.row >= buffer_size:
self.row = buffer_size - 1
raise ScrollScreenException()
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def up(self, num=1):
self.parent.reset_blink_timer()
if self.row == 0:
return
#old_pos = self.position()
self.get_cell().dirty = True
self.row -= num
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def down(self, num=1):
self.parent.reset_blink_timer()
(width, height) = self.parent.get_size()
base = self.parent.get_base_row()
if self.row + num >= (base + height):
self.row = (base + height) - 1
return
#old_pos = self.position()
self.get_cell().dirty = True
self.row += num
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def left(self, num=1):
self.parent.reset_blink_timer()
if self.col == 0:
return
#old_pos = self.position()
self.get_cell().dirty = True
self.col -= num
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def right(self, num=1):
self.parent.reset_blink_timer()
(width, height) = self.parent.get_size()
if self.col + num >= width:
self.col = width - 1
return
#old_pos = self.position()
self.get_cell().dirty = True
self.col += num
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def set_row_col(self, row, col):
#old_pos = self.position()
self.get_cell().dirty = True
self.col = col
self.row = row
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def get_row_col(self):
return (self.row, self.col)
def reset_position(self):
if self.parent.is_alternate_buffer():
#old_pos = self.position()
self.get_cell().dirty = True
self.row = 0
self.col = 0
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
else:
times = self.row - self.parent.get_base_row()
self.parent.scroll(times=times)
def reset_col(self):
#old_pos = self.position()
self.get_cell().dirty = True
self.col = 0
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def reset_row(self):
#old_pos = self.position()
self.get_cell().dirty = True
self.row = 0
#new_pos = self.position()
self.get_cell().dirty = True
#self.widget.update(old_pos)
#self.widget.update(new_pos)
def position(self):
base = self.parent.get_base_row()
return QtCore.QRect(self.col * self.col_size,
(self.row - base) * self.row_size,
self.col_size, self.row_size)
def write(self, ch, advance=True):
if not self.replace_mode:
self.log.warning("Inserting cell")
self.parent.insert_cell(self.row, self.col)
cell = self.get_cell()
cell.set_fgcolor(self.fgcolor)
cell.set_bgcolor(self.bgcolor)
cell.set_character(ch)
cell.set_font(self.font)
if self.inverse:
cell.set_inverse()
cell.dirty = True
#self.widget.update(self.position())
if cell.selected:
self.parent.clear_selection()
cell.toggle_selection()
self.log.debug("Writing '%s' to (%s, %s)" % \
(ch, self.row, self.col))
if advance:
self.log.none("Advancing column after write.")
self.advance_column()
def get_cell(self):
return self.parent.get_cell(self.row, self.col)
def draw(self, painter):
position = self.position()
cell = self.get_cell()
cell.draw(painter, position, inverse=True)
def save_row_col(self):
self._cursor_pos_stack.append((self.row, self.col))
def restore_row_col(self):
if len(self._cursor_pos_stack) == 0:
self.log.warning("Trying to restore unsaved cursor position!")
return
(self.row, self.col) = self._cursor_pos_stack.pop()