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# -*- coding: utf-8 -*-
"""
This module contains the ZoomMode which lets you zoom in and out the editor.
"""
from pyqode.core.api.mode import Mode
from pyqode.qt import QtCore, QtGui, QtWidgets
class ZoomMode(Mode):
""" Zooms/Unzooms the editor (Ctrl+mouse wheel or Ctrl + 0 to reset).
This mode make it possible to zoom in/out the editor view.
Here are the controls:
* **zoom out**: *ctrl+-* or *ctrl+mouse wheel backward*
* **zoom in**: *ctrl++* or *ctrl+mouse wheel forward*
* **reset**: *ctrl + 0*
"""
def __init__(self):
super(ZoomMode, self).__init__()
self.prev_delta = 0
self.default_font_size = 10
def on_state_changed(self, state):
if state:
self.editor.mouse_wheel_activated.connect(
self._on_wheel_event)
self.editor.key_pressed.connect(self._on_key_pressed)
self.mnu_zoom = QtWidgets.QMenu("Zoom")
a = self.mnu_zoom.addAction(QtGui.QIcon.fromTheme(
'zoom-in'), 'Zoom in')
a.setShortcut('Ctrl++')
a.triggered.connect(self.editor.zoom_in)
a = self.mnu_zoom.addAction(QtGui.QIcon.fromTheme(
'zoom-out'), 'Zoom out')
a.setShortcut('Ctrl+-')
a.triggered.connect(self.editor.zoom_out)
a = self.mnu_zoom.addAction(QtGui.QIcon.fromTheme(
'zoom-fit-best'), 'Reset zoom')
a.setShortcut('Ctrl+0')
a.triggered.connect(self.editor.reset_zoom)
a = self.mnu_zoom.menuAction()
a.setIcon(QtGui.QIcon.fromTheme('zoom'))
self.editor.add_action(a, sub_menu=None)
else:
self.editor.mouse_wheel_activated.disconnect(
self._on_wheel_event)
self.editor.remove_action(self.mnu_zoom.menuAction(),
sub_menu=None)
self.editor.key_pressed.disconnect(self._on_key_pressed)
def _on_key_pressed(self, event):
"""
Resets editor font size to the default font size
:param event: wheelEvent
:type event: QKeyEvent
"""
if (int(event.modifiers()) & QtCore.Qt.ControlModifier > 0 and
not int(event.modifiers()) & QtCore.Qt.ShiftModifier):
if event.key() == QtCore.Qt.Key_0:
self.editor.reset_zoom()
event.accept()
if event.key() == QtCore.Qt.Key_Plus:
self.editor.zoom_in()
event.accept()
if event.key() == QtCore.Qt.Key_Minus:
self.editor.zoom_out()
event.accept()
def _on_wheel_event(self, event):
"""
Increments or decrements editor fonts settings on mouse wheel event
if ctrl modifier is on.
:param event: wheel event
:type event: QWheelEvent
"""
try:
delta = event.angleDelta().y()
except AttributeError:
# PyQt4/PySide
delta = event.delta()
if int(event.modifiers()) & QtCore.Qt.ControlModifier > 0:
if delta < self.prev_delta:
self.editor.zoom_out()
event.accept()
else:
self.editor.zoom_in()
event.accept()
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